TY  - JOUR
AU  - Omerašević, Mia
AU  - Pavkov, Vladimir
AU  - Rosić, Milena
AU  - Egerić, Marija
AU  - Nenadović, Snežana
AU  - Bučevac, Dušan
AU  - Potkonjak, Nebojša
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13094
AB  - Porous anorthite (CaAl2Si2O8) ceramics, suitable for thermal insulation in buildings, were obtained using waste seashells as a source of CaO, kaolin as a source of Al2O3 and SiO2 and banana peel as a pore former. Changing the volume of banana peel as well as the processing temperature was found to be an effective approach to control the thermo-mechanical properties of the obtained anorthite ceramics. The sintering of powder compacts containing up to 30 wt% banana peel at temperatures ranging from 1100 to 1200 °C resulted in anorthite ceramics possessing up to 45% open porosity, a compressive strength between 13 and 92 MPa, a bulk density between 1.87 and 2.62 g/cm3 and thermal conductivity between 0.097 and 3.5 W/mK. It was shown that waste materials such as seashells and banana peel can be used to obtain cost-effective thermal insulation in buildings.
T2  - Materials
T1  - Fabrication of Porous Anorthite Ceramic Insulation Using Solid Wastes
VL  - 17
IS  - 7
SP  - 1478
DO  - 10.3390/ma17071478
ER  - 

@article{
author = "Omerašević, Mia and Pavkov, Vladimir and Rosić, Milena and Egerić, Marija and Nenadović, Snežana and Bučevac, Dušan and Potkonjak, Nebojša",
year = "2024",
abstract = "Porous anorthite (CaAl2Si2O8) ceramics, suitable for thermal insulation in buildings, were obtained using waste seashells as a source of CaO, kaolin as a source of Al2O3 and SiO2 and banana peel as a pore former. Changing the volume of banana peel as well as the processing temperature was found to be an effective approach to control the thermo-mechanical properties of the obtained anorthite ceramics. The sintering of powder compacts containing up to 30 wt% banana peel at temperatures ranging from 1100 to 1200 °C resulted in anorthite ceramics possessing up to 45% open porosity, a compressive strength between 13 and 92 MPa, a bulk density between 1.87 and 2.62 g/cm3 and thermal conductivity between 0.097 and 3.5 W/mK. It was shown that waste materials such as seashells and banana peel can be used to obtain cost-effective thermal insulation in buildings.",
journal = "Materials",
title = "Fabrication of Porous Anorthite Ceramic Insulation Using Solid Wastes",
volume = "17",
number = "7",
pages = "1478",
doi = "10.3390/ma17071478"
}

Omerašević, M., Pavkov, V., Rosić, M., Egerić, M., Nenadović, S., Bučevac, D.,& Potkonjak, N.. (2024). Fabrication of Porous Anorthite Ceramic Insulation Using Solid Wastes. in Materials, 17(7), 1478.
https://doi.org/10.3390/ma17071478

Omerašević M, Pavkov V, Rosić M, Egerić M, Nenadović S, Bučevac D, Potkonjak N. Fabrication of Porous Anorthite Ceramic Insulation Using Solid Wastes. in Materials. 2024;17(7):1478.
doi:10.3390/ma17071478 .

Omerašević, Mia, Pavkov, Vladimir, Rosić, Milena, Egerić, Marija, Nenadović, Snežana, Bučevac, Dušan, Potkonjak, Nebojša, "Fabrication of Porous Anorthite Ceramic Insulation Using Solid Wastes" in Materials, 17, no. 7 (2024):1478,
https://doi.org/10.3390/ma17071478 . .

TY  - JOUR
AU  - Lučić, Milica
AU  - Potkonjak, Nebojša
AU  - Sredović Ignjatović, Ivana
AU  - Lević, Steva
AU  - Dajić-Stevanović, Zora
AU  - Kolašinac, Stefan
AU  - Belović, Miona
AU  - Torbica, Aleksandra
AU  - Zlatanović, Ivan
AU  - Pavlović, Vladimir
AU  - Onjia, Antonije
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11363
AB  - This study investigates the effects of ultrasound, in combination with chemical pretreatments, on the quality attributes (total phenolic and carotenoid content, antioxidant activity (2,2-Diphenyl-1-picrylhydrazyl assay (DPPH)), ferric-reducing ability (FRAP), CIE L* a* b* color, non-enzymatic browning, rehydration ratio, textural and morphological properties) of red pepper subjected to drying (hot air drying or freeze drying). The fractional factorial design was used to assess the impact of factors. The global Derringer desirability function was used to determine the optimal conditions for the best quality attributes of dried pepper. The drying method influenced total phenolic content, a* (redness), and initial rehydration ratio; pretreatment time significantly affected FRAP antiradical activity, a*, chroma and non-browning index, while pH-value had a significant effect on the texture of dried pepper. Non-enzymatic browning was reduced to 72.6%, while the DPPH antioxidant capacity of freeze-dried peppers was enhanced from 4.2% to 71.9%. Ultrasonic pretreatment led to changes in the pepper morphology, while potassium metabisulfite (KMS) was a more effective additive than citric acid.
T2  - Foods
T1  - Influence of Ultrasonic and Chemical Pretreatments on Quality Attributes of Dried Pepper (Capsicum annuum)
VL  - 12
IS  - 13
SP  - 2468
DO  - 10.3390/foods12132468
ER  - 

@article{
author = "Lučić, Milica and Potkonjak, Nebojša and Sredović Ignjatović, Ivana and Lević, Steva and Dajić-Stevanović, Zora and Kolašinac, Stefan and Belović, Miona and Torbica, Aleksandra and Zlatanović, Ivan and Pavlović, Vladimir and Onjia, Antonije",
year = "2023",
abstract = "This study investigates the effects of ultrasound, in combination with chemical pretreatments, on the quality attributes (total phenolic and carotenoid content, antioxidant activity (2,2-Diphenyl-1-picrylhydrazyl assay (DPPH)), ferric-reducing ability (FRAP), CIE L* a* b* color, non-enzymatic browning, rehydration ratio, textural and morphological properties) of red pepper subjected to drying (hot air drying or freeze drying). The fractional factorial design was used to assess the impact of factors. The global Derringer desirability function was used to determine the optimal conditions for the best quality attributes of dried pepper. The drying method influenced total phenolic content, a* (redness), and initial rehydration ratio; pretreatment time significantly affected FRAP antiradical activity, a*, chroma and non-browning index, while pH-value had a significant effect on the texture of dried pepper. Non-enzymatic browning was reduced to 72.6%, while the DPPH antioxidant capacity of freeze-dried peppers was enhanced from 4.2% to 71.9%. Ultrasonic pretreatment led to changes in the pepper morphology, while potassium metabisulfite (KMS) was a more effective additive than citric acid.",
journal = "Foods",
title = "Influence of Ultrasonic and Chemical Pretreatments on Quality Attributes of Dried Pepper (Capsicum annuum)",
volume = "12",
number = "13",
pages = "2468",
doi = "10.3390/foods12132468"
}

Lučić, M., Potkonjak, N., Sredović Ignjatović, I., Lević, S., Dajić-Stevanović, Z., Kolašinac, S., Belović, M., Torbica, A., Zlatanović, I., Pavlović, V.,& Onjia, A.. (2023). Influence of Ultrasonic and Chemical Pretreatments on Quality Attributes of Dried Pepper (Capsicum annuum). in Foods, 12(13), 2468.
https://doi.org/10.3390/foods12132468

Lučić M, Potkonjak N, Sredović Ignjatović I, Lević S, Dajić-Stevanović Z, Kolašinac S, Belović M, Torbica A, Zlatanović I, Pavlović V, Onjia A. Influence of Ultrasonic and Chemical Pretreatments on Quality Attributes of Dried Pepper (Capsicum annuum). in Foods. 2023;12(13):2468.
doi:10.3390/foods12132468 .

Lučić, Milica, Potkonjak, Nebojša, Sredović Ignjatović, Ivana, Lević, Steva, Dajić-Stevanović, Zora, Kolašinac, Stefan, Belović, Miona, Torbica, Aleksandra, Zlatanović, Ivan, Pavlović, Vladimir, Onjia, Antonije, "Influence of Ultrasonic and Chemical Pretreatments on Quality Attributes of Dried Pepper (Capsicum annuum)" in Foods, 12, no. 13 (2023):2468,
https://doi.org/10.3390/foods12132468 . .

TY  - CONF
AU  - Čokeša, Đuro
AU  - Marković, Mirjana
AU  - Potkonjak, Nebojša
AU  - Kaluđerović, Branka
AU  - Radmanović, Svjetlana
AU  - Šerbula, Snežana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12847
AB  - Arsenite–humic acid-binding process was investigated using the Isothermal Titration Calorimetry(ITC). The ITC data were successfully (R2=0.996-0.936) interpreted by applying the MNIS model,enabling thermodynamic parameters to be determined. The MNIS model was adjusted to the arsenite–HA binding process assuming hydrogen bonding as the dominant type of interaction in the system.Negative enthalpy change values indicated the arsenite–HAs binding as an exothermic process.Negative ΔG values (-(27.85-26.83) kJ mol-1) pointed out to spontaneous binding reaction, leading tothe formation of the arsenite–HA complexes. High binding constants values ((7.57-5.02)105 M-1)clearly demonstrated pronounced binding affinity. As ΔS values (0.041-0.027) kJ mol-1 K-1) wereapparently positive, but close to zero, and ΔH>ΔS, the reaction could be considered enthalpy driven.Reaction heats and H values (-(18.96-15.64) kJ mol-1) confirmed hydrogen bonds as the mostascendant interaction type in the arsenite–HA complex. Thermodynamic and reaction parametersclearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming thepossible influence of humic acids on increased As mobility, and its reduced bioavailability.
PB  - Bor : University of Belgrade, Technical Faculty in Bor
C3  - EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings
T1  - Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model
SP  - 121
EP  - 126
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12847
ER  - 

@conference{
author = "Čokeša, Đuro and Marković, Mirjana and Potkonjak, Nebojša and Kaluđerović, Branka and Radmanović, Svjetlana and Šerbula, Snežana",
year = "2023",
abstract = "Arsenite–humic acid-binding process was investigated using the Isothermal Titration Calorimetry(ITC). The ITC data were successfully (R2=0.996-0.936) interpreted by applying the MNIS model,enabling thermodynamic parameters to be determined. The MNIS model was adjusted to the arsenite–HA binding process assuming hydrogen bonding as the dominant type of interaction in the system.Negative enthalpy change values indicated the arsenite–HAs binding as an exothermic process.Negative ΔG values (-(27.85-26.83) kJ mol-1) pointed out to spontaneous binding reaction, leading tothe formation of the arsenite–HA complexes. High binding constants values ((7.57-5.02)105 M-1)clearly demonstrated pronounced binding affinity. As ΔS values (0.041-0.027) kJ mol-1 K-1) wereapparently positive, but close to zero, and ΔH>ΔS, the reaction could be considered enthalpy driven.Reaction heats and H values (-(18.96-15.64) kJ mol-1) confirmed hydrogen bonds as the mostascendant interaction type in the arsenite–HA complex. Thermodynamic and reaction parametersclearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming thepossible influence of humic acids on increased As mobility, and its reduced bioavailability.",
publisher = "Bor : University of Belgrade, Technical Faculty in Bor",
journal = "EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings",
title = "Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model",
pages = "121-126",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12847"
}

Čokeša, Đ., Marković, M., Potkonjak, N., Kaluđerović, B., Radmanović, S.,& Šerbula, S.. (2023). Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model. in EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings
Bor : University of Belgrade, Technical Faculty in Bor., 121-126.
https://hdl.handle.net/21.15107/rcub_vinar_12847

Čokeša Đ, Marković M, Potkonjak N, Kaluđerović B, Radmanović S, Šerbula S. Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model. in EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings. 2023;:121-126.
https://hdl.handle.net/21.15107/rcub_vinar_12847 .

Čokeša, Đuro, Marković, Mirjana, Potkonjak, Nebojša, Kaluđerović, Branka, Radmanović, Svjetlana, Šerbula, Snežana, "Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model" in EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings (2023):121-126,
https://hdl.handle.net/21.15107/rcub_vinar_12847 .

TY  - JOUR
AU  - Lazarević-Pašti, Tamara
AU  - Tasić, Tamara
AU  - Milanković, Vedran
AU  - Potkonjak, Nebojša I.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10616
AB  - The increase of production and consumption persistently introduce different pollutants into the environment. The constant development and improvement of analytical methods for tracking environmental contaminants are essential. The demand for high sample throughput analysis has hit the spotlight for developing selective sensors to avoid time-consuming sample preparation techniques. In addition, the sensor’s sensitivity should satisfy the rigorous demands of harmful compound tracking. Molecularly imprinted plasmonic-based sensors are excellent candidates to overcome selectivity and sensitivity issues. Molecularly imprinted polymers are robust, stable in aqueous and organic solvents, stable at extreme pHs and temperatures, and include a low-cost synthesis procedure. Combined with plasmonic-based techniques, they are the perspective choice for applications in the field of environmental protection. Plasmonic-based sensors offer a lower limit of detection, a broad linearity range, high sensitivity, and high selectivity compared to other detection techniques. This review outlines the optical plasmonic detection of different environmental contaminants with molecularly imprinted polymers as sensing elements. The main focus is on the environmental pollutants affecting human and animal health, such as pesticides, pharmaceuticals, hormones, microorganisms, polycyclic aromatic hydrocarbons, dyes, and metal particles. Although molecularly imprinted plasmonic-based sensors currently have their application mostly in the biomedical field, we are eager to point them out as a highly prospective solution for many environmental problems.
T2  - Chemosensors
T1  - Molecularly Imprinted Plasmonic-Based Sensors for Environmental Contaminants—Current State and Future Perspectives
VL  - 11
IS  - 1
SP  - 35
DO  - 10.3390/chemosensors11010035
ER  - 

@article{
author = "Lazarević-Pašti, Tamara and Tasić, Tamara and Milanković, Vedran and Potkonjak, Nebojša I.",
year = "2023",
abstract = "The increase of production and consumption persistently introduce different pollutants into the environment. The constant development and improvement of analytical methods for tracking environmental contaminants are essential. The demand for high sample throughput analysis has hit the spotlight for developing selective sensors to avoid time-consuming sample preparation techniques. In addition, the sensor’s sensitivity should satisfy the rigorous demands of harmful compound tracking. Molecularly imprinted plasmonic-based sensors are excellent candidates to overcome selectivity and sensitivity issues. Molecularly imprinted polymers are robust, stable in aqueous and organic solvents, stable at extreme pHs and temperatures, and include a low-cost synthesis procedure. Combined with plasmonic-based techniques, they are the perspective choice for applications in the field of environmental protection. Plasmonic-based sensors offer a lower limit of detection, a broad linearity range, high sensitivity, and high selectivity compared to other detection techniques. This review outlines the optical plasmonic detection of different environmental contaminants with molecularly imprinted polymers as sensing elements. The main focus is on the environmental pollutants affecting human and animal health, such as pesticides, pharmaceuticals, hormones, microorganisms, polycyclic aromatic hydrocarbons, dyes, and metal particles. Although molecularly imprinted plasmonic-based sensors currently have their application mostly in the biomedical field, we are eager to point them out as a highly prospective solution for many environmental problems.",
journal = "Chemosensors",
title = "Molecularly Imprinted Plasmonic-Based Sensors for Environmental Contaminants—Current State and Future Perspectives",
volume = "11",
number = "1",
pages = "35",
doi = "10.3390/chemosensors11010035"
}

Lazarević-Pašti, T., Tasić, T., Milanković, V.,& Potkonjak, N. I.. (2023). Molecularly Imprinted Plasmonic-Based Sensors for Environmental Contaminants—Current State and Future Perspectives. in Chemosensors, 11(1), 35.
https://doi.org/10.3390/chemosensors11010035

Lazarević-Pašti T, Tasić T, Milanković V, Potkonjak NI. Molecularly Imprinted Plasmonic-Based Sensors for Environmental Contaminants—Current State and Future Perspectives. in Chemosensors. 2023;11(1):35.
doi:10.3390/chemosensors11010035 .

Lazarević-Pašti, Tamara, Tasić, Tamara, Milanković, Vedran, Potkonjak, Nebojša I., "Molecularly Imprinted Plasmonic-Based Sensors for Environmental Contaminants—Current State and Future Perspectives" in Chemosensors, 11, no. 1 (2023):35,
https://doi.org/10.3390/chemosensors11010035 . .

TY  - CONF
AU  - Anićijević, Vladan
AU  - Potkonjak, Nebojša
AU  - Lazarević-Pašti, Tamara
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10821
AB  - Organophosphate pesticides are known to be some of the most toxic substances synthesized by a man today. Extensive use of this group of compounds in contemporary agriculture results in a critical need for their efficient removal from the environment, especially water. Adsorption of pesticides on different materials is one of the most frequently used strategies for this purpose. In the past decade, the use of graphene-oxide escalated due to its interesting properties. In this contribution, the adsorption of organophosphate pesticide dimethoate on two commercially available graphene-oxides has been investigated. The materials were characterized by different physico-chemical methods. Careful structural characterization of adsorbents was combined with batch adsorption experiments. It was shown that 1 g of both graphene-oxides is capable of adsorbing 9×10-3 mol dm-3 of dimethoate at 25 °C. A satisfactory agreement of both sets of experimental results with the Langmuir isotherm model suggests the monolayer adsorption on the homogenous surface. The adsorption was also investigated at 30 and 35 °C. The results showed that the concentration of adsorbed dimethoate increases with temperature for both studied adsorbents. Investigated grapheneoxides were successfully used for the removal of dimethoate from water.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade
T1  - Structural properties of graphene-oxide and its capacity for the elimination of dimethoate from water
SP  - 81
EP  - 82
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10821
ER  - 

@conference{
author = "Anićijević, Vladan and Potkonjak, Nebojša and Lazarević-Pašti, Tamara",
year = "2022",
abstract = "Organophosphate pesticides are known to be some of the most toxic substances synthesized by a man today. Extensive use of this group of compounds in contemporary agriculture results in a critical need for their efficient removal from the environment, especially water. Adsorption of pesticides on different materials is one of the most frequently used strategies for this purpose. In the past decade, the use of graphene-oxide escalated due to its interesting properties. In this contribution, the adsorption of organophosphate pesticide dimethoate on two commercially available graphene-oxides has been investigated. The materials were characterized by different physico-chemical methods. Careful structural characterization of adsorbents was combined with batch adsorption experiments. It was shown that 1 g of both graphene-oxides is capable of adsorbing 9×10-3 mol dm-3 of dimethoate at 25 °C. A satisfactory agreement of both sets of experimental results with the Langmuir isotherm model suggests the monolayer adsorption on the homogenous surface. The adsorption was also investigated at 30 and 35 °C. The results showed that the concentration of adsorbed dimethoate increases with temperature for both studied adsorbents. Investigated grapheneoxides were successfully used for the removal of dimethoate from water.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade",
title = "Structural properties of graphene-oxide and its capacity for the elimination of dimethoate from water",
pages = "81-82",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10821"
}

Anićijević, V., Potkonjak, N.,& Lazarević-Pašti, T.. (2022). Structural properties of graphene-oxide and its capacity for the elimination of dimethoate from water. in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade
Belgrade : Serbian Ceramic Society., 81-82.
https://hdl.handle.net/21.15107/rcub_vinar_10821

Anićijević V, Potkonjak N, Lazarević-Pašti T. Structural properties of graphene-oxide and its capacity for the elimination of dimethoate from water. in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade. 2022;:81-82.
https://hdl.handle.net/21.15107/rcub_vinar_10821 .

Anićijević, Vladan, Potkonjak, Nebojša, Lazarević-Pašti, Tamara, "Structural properties of graphene-oxide and its capacity for the elimination of dimethoate from water" in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade (2022):81-82,
https://hdl.handle.net/21.15107/rcub_vinar_10821 .

TY  - CHAP
AU  - Potkonjak, Nebojša I.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10730
AB  - The application of organophosphorus flame retardants (OPFRs) is continuously increasing over the years. There is a growing concern for OPFRs’ safety due to their high production. Unavoidable, large quantities of OPFRs enter the environment. Sewage and solid waste (particularly e-waste) treatment plants are the major sources of OPFRs released into the environment. OPFRs are extensively detected in air, dust, water, soil, sediment, and sludge. This chapter discusses and compares the most advanced analytical procedures of OPFRs, including extraction, purification, gas, and liquid chromatography determination techniques. The environmental occurrence of OPFRs was analyzed. Finally, the accumulation and metabolic pathway of OPFRs on living organisms are overviewed. © 2022 Nova Science Publishers, Inc.
T2  - Organophosphates: Detection, Exposure and Occurrence. Volume 1: Impact on Health and the Natural Environment
T1  - Organophosphates as Flame Retardants
SP  - 341
EP  - 364
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10730
ER  - 

@inbook{
author = "Potkonjak, Nebojša I.",
year = "2022",
abstract = "The application of organophosphorus flame retardants (OPFRs) is continuously increasing over the years. There is a growing concern for OPFRs’ safety due to their high production. Unavoidable, large quantities of OPFRs enter the environment. Sewage and solid waste (particularly e-waste) treatment plants are the major sources of OPFRs released into the environment. OPFRs are extensively detected in air, dust, water, soil, sediment, and sludge. This chapter discusses and compares the most advanced analytical procedures of OPFRs, including extraction, purification, gas, and liquid chromatography determination techniques. The environmental occurrence of OPFRs was analyzed. Finally, the accumulation and metabolic pathway of OPFRs on living organisms are overviewed. © 2022 Nova Science Publishers, Inc.",
journal = "Organophosphates: Detection, Exposure and Occurrence. Volume 1: Impact on Health and the Natural Environment",
booktitle = "Organophosphates as Flame Retardants",
pages = "341-364",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10730"
}

Potkonjak, N. I.. (2022). Organophosphates as Flame Retardants. in Organophosphates: Detection, Exposure and Occurrence. Volume 1: Impact on Health and the Natural Environment, 341-364.
https://hdl.handle.net/21.15107/rcub_vinar_10730

Potkonjak NI. Organophosphates as Flame Retardants. in Organophosphates: Detection, Exposure and Occurrence. Volume 1: Impact on Health and the Natural Environment. 2022;:341-364.
https://hdl.handle.net/21.15107/rcub_vinar_10730 .

Potkonjak, Nebojša I., "Organophosphates as Flame Retardants" in Organophosphates: Detection, Exposure and Occurrence. Volume 1: Impact on Health and the Natural Environment (2022):341-364,
https://hdl.handle.net/21.15107/rcub_vinar_10730 .

TY  - JOUR
AU  - Maksimović, Tijana V.
AU  - Maksimović, Jelena P.
AU  - Tančić, Pavle I.
AU  - Potkonjak, Nebojša I.
AU  - Nedić, Zoran P.
AU  - Joksović, Ljubinka G.
AU  - Pagnacco, Maja C.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9878
AB  - The calcium phosphate tungsten bronze (Ca-PWB) has been synthesized and characterized (TGA, DSC, XRPD, FTIR, SEM). The influence of solid insoluble materials Ca-PWB, as well as lithium doped (Li-PWB) and cation free phosphate tungsten (PWB) bronzes on the oscillatory Briggs-Rauscher (BR) reaction dynamics, is compared. The results show that doping with Li and Ca reduces sensitivity of the BR reaction towards bronzes addition. These findings suggest the usage of the BR reaction as an innovative method for testing of different properties of bronze material. The behavior of PWB in the BR reaction is significantly changed with divalent cation (Ca2+) doping. The reasons for the different bronzes behavior were found in their calculated unit cell volumes. Namely, the compressed Ca-PWB unit cell volume indicates the difficult availability of the active site for heterogeneous catalysis. Hence, the linear correlation (slope) of the BR oscillogram’s length (τosc) vs. mass of bronze in BR reaction might be considered as a new parameter for the evaluation of the bronzes catalytic activity.
T2  - Science of Sintering
T1  - A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response
VL  - 53
IS  - 2
SP  - 223
EP  - 235
DO  - 10.2298/SOS2102223M
ER  - 

@article{
author = "Maksimović, Tijana V. and Maksimović, Jelena P. and Tančić, Pavle I. and Potkonjak, Nebojša I. and Nedić, Zoran P. and Joksović, Ljubinka G. and Pagnacco, Maja C.",
year = "2021",
abstract = "The calcium phosphate tungsten bronze (Ca-PWB) has been synthesized and characterized (TGA, DSC, XRPD, FTIR, SEM). The influence of solid insoluble materials Ca-PWB, as well as lithium doped (Li-PWB) and cation free phosphate tungsten (PWB) bronzes on the oscillatory Briggs-Rauscher (BR) reaction dynamics, is compared. The results show that doping with Li and Ca reduces sensitivity of the BR reaction towards bronzes addition. These findings suggest the usage of the BR reaction as an innovative method for testing of different properties of bronze material. The behavior of PWB in the BR reaction is significantly changed with divalent cation (Ca2+) doping. The reasons for the different bronzes behavior were found in their calculated unit cell volumes. Namely, the compressed Ca-PWB unit cell volume indicates the difficult availability of the active site for heterogeneous catalysis. Hence, the linear correlation (slope) of the BR oscillogram’s length (τosc) vs. mass of bronze in BR reaction might be considered as a new parameter for the evaluation of the bronzes catalytic activity.",
journal = "Science of Sintering",
title = "A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response",
volume = "53",
number = "2",
pages = "223-235",
doi = "10.2298/SOS2102223M"
}

Maksimović, T. V., Maksimović, J. P., Tančić, P. I., Potkonjak, N. I., Nedić, Z. P., Joksović, L. G.,& Pagnacco, M. C.. (2021). A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response. in Science of Sintering, 53(2), 223-235.
https://doi.org/10.2298/SOS2102223M

Maksimović TV, Maksimović JP, Tančić PI, Potkonjak NI, Nedić ZP, Joksović LG, Pagnacco MC. A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response. in Science of Sintering. 2021;53(2):223-235.
doi:10.2298/SOS2102223M .

Maksimović, Tijana V., Maksimović, Jelena P., Tančić, Pavle I., Potkonjak, Nebojša I., Nedić, Zoran P., Joksović, Ljubinka G., Pagnacco, Maja C., "A possible connection between phosphate tungsten bronzes properties and briggs-rauscher oscillatory reaction response" in Science of Sintering, 53, no. 2 (2021):223-235,
https://doi.org/10.2298/SOS2102223M . .

TY  - JOUR
AU  - Milanović, Srđan
AU  - Potkonjak, Nebojša I.
AU  - Mandušić, Vesna
AU  - Čokeša, Đuro
AU  - Hranisavljević, Jelena
AU  - Kaluđerović, Branka V.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8975
AB  - Carbonaceous materials as well as its form functionalized with metallic silver have been prepared by hydrothermal carbonization of fructose. Results are presented to show that nanostructured silver was obtained through the functionalization process. The carbonaceous materials were characterized by: nitrogen adsorption/desorption measurement, XRD, SEM/EDS and FTIR. Samples functionalized with silver were analyzed by: XRD and SEM/EDS. The XRD analysis showed that the carbonaceous materials functionalized with silver by hydrothermal carbonization process were successfully performed. Size of silver particles was found to be approximately 32 nm, indicating formation of nanostructure. All samples were tested as an antimicrobial agent for water disinfection. Presence of nanostructured silver in the sample containing 1 mg/mL carbonaceous materials significantly decreased the number of CFU (dCFU = 97.33 %) if compared to the same sample containing the same amount of carbonaceous materials but without of silver (dCFU 65.33 %).
T2  - Science of Sintering
T1  - Antimicrobial effects of carbonaceous material functionalized with silver
VL  - 52
IS  - 1
SP  - 87
EP  - 95
DO  - 10.2298/SOS2001087M
ER  - 

@article{
author = "Milanović, Srđan and Potkonjak, Nebojša I. and Mandušić, Vesna and Čokeša, Đuro and Hranisavljević, Jelena and Kaluđerović, Branka V.",
year = "2020",
abstract = "Carbonaceous materials as well as its form functionalized with metallic silver have been prepared by hydrothermal carbonization of fructose. Results are presented to show that nanostructured silver was obtained through the functionalization process. The carbonaceous materials were characterized by: nitrogen adsorption/desorption measurement, XRD, SEM/EDS and FTIR. Samples functionalized with silver were analyzed by: XRD and SEM/EDS. The XRD analysis showed that the carbonaceous materials functionalized with silver by hydrothermal carbonization process were successfully performed. Size of silver particles was found to be approximately 32 nm, indicating formation of nanostructure. All samples were tested as an antimicrobial agent for water disinfection. Presence of nanostructured silver in the sample containing 1 mg/mL carbonaceous materials significantly decreased the number of CFU (dCFU = 97.33 %) if compared to the same sample containing the same amount of carbonaceous materials but without of silver (dCFU 65.33 %).",
journal = "Science of Sintering",
title = "Antimicrobial effects of carbonaceous material functionalized with silver",
volume = "52",
number = "1",
pages = "87-95",
doi = "10.2298/SOS2001087M"
}

Milanović, S., Potkonjak, N. I., Mandušić, V., Čokeša, Đ., Hranisavljević, J.,& Kaluđerović, B. V.. (2020). Antimicrobial effects of carbonaceous material functionalized with silver. in Science of Sintering, 52(1), 87-95.
https://doi.org/10.2298/SOS2001087M

Milanović S, Potkonjak NI, Mandušić V, Čokeša Đ, Hranisavljević J, Kaluđerović BV. Antimicrobial effects of carbonaceous material functionalized with silver. in Science of Sintering. 2020;52(1):87-95.
doi:10.2298/SOS2001087M .

Milanović, Srđan, Potkonjak, Nebojša I., Mandušić, Vesna, Čokeša, Đuro, Hranisavljević, Jelena, Kaluđerović, Branka V., "Antimicrobial effects of carbonaceous material functionalized with silver" in Science of Sintering, 52, no. 1 (2020):87-95,
https://doi.org/10.2298/SOS2001087M . .

TY  - CHAP
AU  - Potkonjak, Nebojša I.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9742
AB  - There has been an exponential increase in the usage of organophosphorus (OP) compounds as pesticides. Organophosphorus pesticide analysis has become a progressively important research area due to its extensive application and pollution of the environment. In particular, there is a great need to develop moveable analytical apparatuses that are responsive to remediation and bioremediation process monitoring, where a rapid analysis of a large number of samples is essential. This can be achieved by integrating bio-components with different electrochemical transducers. The close combination of the biological proceedings with the generation of a signal opens the possibility for manufacturing compact and easy-to-use analytical instruments of high sensitivity and specificity. The accessibility of advanced materials, associated with new sensing techniques has led to outstanding innovations in the design and construction of organophosphorus biosensors. Organophosphorus pesticide analysis has become an increasingly significant research area due to its widespread application and contamination of the environment. Distinct from traditional methods of pesticide detection, the application of electrochemical biosensors based on the enzyme (or bacteria)- functionalized nanostructures in the field of pesticide analysis is promising. This review mainly introduces the recent achievements and problems in biosensors based on the enzyme (or bacteria)-functionalized nanostructures for organophosphorus pesticide detection. © 2020 Nova Science Publishers, Inc.
T2  - Organophosphate Pesticides
T1  - Electrochemical biosensors for organophosphate pesticide detection
SP  - 43
EP  - 74
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9742
ER  - 

@inbook{
author = "Potkonjak, Nebojša I.",
year = "2020",
abstract = "There has been an exponential increase in the usage of organophosphorus (OP) compounds as pesticides. Organophosphorus pesticide analysis has become a progressively important research area due to its extensive application and pollution of the environment. In particular, there is a great need to develop moveable analytical apparatuses that are responsive to remediation and bioremediation process monitoring, where a rapid analysis of a large number of samples is essential. This can be achieved by integrating bio-components with different electrochemical transducers. The close combination of the biological proceedings with the generation of a signal opens the possibility for manufacturing compact and easy-to-use analytical instruments of high sensitivity and specificity. The accessibility of advanced materials, associated with new sensing techniques has led to outstanding innovations in the design and construction of organophosphorus biosensors. Organophosphorus pesticide analysis has become an increasingly significant research area due to its widespread application and contamination of the environment. Distinct from traditional methods of pesticide detection, the application of electrochemical biosensors based on the enzyme (or bacteria)- functionalized nanostructures in the field of pesticide analysis is promising. This review mainly introduces the recent achievements and problems in biosensors based on the enzyme (or bacteria)-functionalized nanostructures for organophosphorus pesticide detection. © 2020 Nova Science Publishers, Inc.",
journal = "Organophosphate Pesticides",
booktitle = "Electrochemical biosensors for organophosphate pesticide detection",
pages = "43-74",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9742"
}

Potkonjak, N. I.. (2020). Electrochemical biosensors for organophosphate pesticide detection. in Organophosphate Pesticides, 43-74.
https://hdl.handle.net/21.15107/rcub_vinar_9742

Potkonjak NI. Electrochemical biosensors for organophosphate pesticide detection. in Organophosphate Pesticides. 2020;:43-74.
https://hdl.handle.net/21.15107/rcub_vinar_9742 .

Potkonjak, Nebojša I., "Electrochemical biosensors for organophosphate pesticide detection" in Organophosphate Pesticides (2020):43-74,
https://hdl.handle.net/21.15107/rcub_vinar_9742 .

TY  - JOUR
AU  - Pagnacco, Maja C.
AU  - Maksimović, Jelena P.
AU  - Potkonjak, Nebojša I.
AU  - Božić, Bojan D.
AU  - Horvath, Attila K.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1919
AB  - The Briggs-Rauscher reaction containing malonic acid may undergo a sudden transition from low (state I) to high iodide and iodine (state concentration states after a well-defined and strongly reproducible oscillatory period. This study clearly shows that even though the time-dependent behavior of the oscillatory state is reproducible, the time lag necessary for the appearance of the state I to state II transition after the system leaves the oscillatory state becomes irreproducible for an individual kinetic run. This crazy clock behavior of the state I to state II transition is identified by repeated experiments in which stirring rate is taken as a control parameter and all other parameters such as initial conditions, temperature, vessel surface, and the age of solution were kept constant. Surprisingly, a better stirring condition does not make the transition reproducible; it simply does not allow the transition to happen at all. The proposed mechanism, additional explanations, and proposals for this irreproducibility of state II been presented. Considering the fact that the number of crazy clock reactions is only a few, this study may contribute to a better understanding of fundaments of this phenomenon.
T2  - Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
T1  - Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior
VL  - 122
IS  - 2
SP  - 482
EP  - 491
DO  - 10.1021/acs.jpca.7b11774
ER  - 

@article{
author = "Pagnacco, Maja C. and Maksimović, Jelena P. and Potkonjak, Nebojša I. and Božić, Bojan D. and Horvath, Attila K.",
year = "2018",
abstract = "The Briggs-Rauscher reaction containing malonic acid may undergo a sudden transition from low (state I) to high iodide and iodine (state concentration states after a well-defined and strongly reproducible oscillatory period. This study clearly shows that even though the time-dependent behavior of the oscillatory state is reproducible, the time lag necessary for the appearance of the state I to state II transition after the system leaves the oscillatory state becomes irreproducible for an individual kinetic run. This crazy clock behavior of the state I to state II transition is identified by repeated experiments in which stirring rate is taken as a control parameter and all other parameters such as initial conditions, temperature, vessel surface, and the age of solution were kept constant. Surprisingly, a better stirring condition does not make the transition reproducible; it simply does not allow the transition to happen at all. The proposed mechanism, additional explanations, and proposals for this irreproducibility of state II been presented. Considering the fact that the number of crazy clock reactions is only a few, this study may contribute to a better understanding of fundaments of this phenomenon.",
journal = "Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory",
title = "Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior",
volume = "122",
number = "2",
pages = "482-491",
doi = "10.1021/acs.jpca.7b11774"
}

Pagnacco, M. C., Maksimović, J. P., Potkonjak, N. I., Božić, B. D.,& Horvath, A. K.. (2018). Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior. in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 122(2), 482-491.
https://doi.org/10.1021/acs.jpca.7b11774

Pagnacco MC, Maksimović JP, Potkonjak NI, Božić BD, Horvath AK. Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior. in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory. 2018;122(2):482-491.
doi:10.1021/acs.jpca.7b11774 .

Pagnacco, Maja C., Maksimović, Jelena P., Potkonjak, Nebojša I., Božić, Bojan D., Horvath, Attila K., "Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior" in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 122, no. 2 (2018):482-491,
https://doi.org/10.1021/acs.jpca.7b11774 . .

TY  - JOUR
AU  - Potkonjak, Nebojša I.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1902
AB  - The anodic dissolution of copper electrode in 1 M trifluoroacetic acid (TFA) was investigated by applying linear sweep and cyclic voltammetry. The current-potential (I-E) polarization curves (voltammograms) were interpreted from the perspective of non-linear dynamics. The obtained results showed that the voltammogram can be divided into three separate regions. As the system was moved away from the thermodynamical equilibrium, the first to appear is the region of stable steady-state (marked as SSS1 region). This region was followed by the region of oscillatory states (the OsS region). The SSS1 - GT OsS transition is characterized by bifurcation potential, E (BIF1) = 0.558 V-SCE. The third region, the region of stable steady-state (marked as the SSS2 region) occurs after the OsS - GT SSS2 transition, and is characterized by the potential bifurcation, E (BIF2) = 0.657 V-SCE. The cyclic voltammetry measurement has revealed the lack of hysteresis at the SSS1 a dagger OsS transition, and its existence at the OsS a dagger SSS2 transition (the hysteresis width was 34 mV). The results of this study are presented to demonstrate that the voltammograms of the Cu|1 M TFA oscillating electrochemical system can be considered as a bifurcation diagram, experimentally constructed under dynamical conditions.
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - Consideration about a voltammogram as the bifurcation diagram of oscillating electrochemical systems: a case study of the copper|1 M trifluoroacetic acid oscillator
VL  - 123
IS  - 1
SP  - 155
EP  - 163
DO  - 10.1007/s11144-017-1325-5
ER  - 

@article{
author = "Potkonjak, Nebojša I.",
year = "2018",
abstract = "The anodic dissolution of copper electrode in 1 M trifluoroacetic acid (TFA) was investigated by applying linear sweep and cyclic voltammetry. The current-potential (I-E) polarization curves (voltammograms) were interpreted from the perspective of non-linear dynamics. The obtained results showed that the voltammogram can be divided into three separate regions. As the system was moved away from the thermodynamical equilibrium, the first to appear is the region of stable steady-state (marked as SSS1 region). This region was followed by the region of oscillatory states (the OsS region). The SSS1 - GT OsS transition is characterized by bifurcation potential, E (BIF1) = 0.558 V-SCE. The third region, the region of stable steady-state (marked as the SSS2 region) occurs after the OsS - GT SSS2 transition, and is characterized by the potential bifurcation, E (BIF2) = 0.657 V-SCE. The cyclic voltammetry measurement has revealed the lack of hysteresis at the SSS1 a dagger OsS transition, and its existence at the OsS a dagger SSS2 transition (the hysteresis width was 34 mV). The results of this study are presented to demonstrate that the voltammograms of the Cu|1 M TFA oscillating electrochemical system can be considered as a bifurcation diagram, experimentally constructed under dynamical conditions.",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "Consideration about a voltammogram as the bifurcation diagram of oscillating electrochemical systems: a case study of the copper|1 M trifluoroacetic acid oscillator",
volume = "123",
number = "1",
pages = "155-163",
doi = "10.1007/s11144-017-1325-5"
}

Potkonjak, N. I.. (2018). Consideration about a voltammogram as the bifurcation diagram of oscillating electrochemical systems: a case study of the copper|1 M trifluoroacetic acid oscillator. in Reaction Kinetics, Mechanisms and Catalysis, 123(1), 155-163.
https://doi.org/10.1007/s11144-017-1325-5

Potkonjak NI. Consideration about a voltammogram as the bifurcation diagram of oscillating electrochemical systems: a case study of the copper|1 M trifluoroacetic acid oscillator. in Reaction Kinetics, Mechanisms and Catalysis. 2018;123(1):155-163.
doi:10.1007/s11144-017-1325-5 .

Potkonjak, Nebojša I., "Consideration about a voltammogram as the bifurcation diagram of oscillating electrochemical systems: a case study of the copper|1 M trifluoroacetic acid oscillator" in Reaction Kinetics, Mechanisms and Catalysis, 123, no. 1 (2018):155-163,
https://doi.org/10.1007/s11144-017-1325-5 . .

TY  - CONF
AU  - Potkonjak, Tanja N.
AU  - Potkonjak, Nebojša I.
AU  - Nikolić, Z.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9175
AB  - Bifurcation analysis of the Cu│1 M TFA electrochemical oscillatory system was  done  by  using  voltammetric data,obtained  under  qusi-potetiostatic polarization  conditions.  Asuper-critical  Hopf  bifurcationand  a  saddle-loop bifurcationwere identified at following bifurcation potentials EBIF1= 0.5446 VandEBIF2=0.7536 V, respectively.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
T1  - On the use of voltammetric data in bifurcation analysis of electrochemical oscillatory system:Cu │1.0 M TFA
SP  - 339
EP  - 342
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9175
ER  - 

@conference{
author = "Potkonjak, Tanja N. and Potkonjak, Nebojša I. and Nikolić, Z.",
year = "2016",
abstract = "Bifurcation analysis of the Cu│1 M TFA electrochemical oscillatory system was  done  by  using  voltammetric data,obtained  under  qusi-potetiostatic polarization  conditions.  Asuper-critical  Hopf  bifurcationand  a  saddle-loop bifurcationwere identified at following bifurcation potentials EBIF1= 0.5446 VandEBIF2=0.7536 V, respectively.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry",
title = "On the use of voltammetric data in bifurcation analysis of electrochemical oscillatory system:Cu │1.0 M TFA",
pages = "339-342",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9175"
}

Potkonjak, T. N., Potkonjak, N. I.,& Nikolić, Z.. (2016). On the use of voltammetric data in bifurcation analysis of electrochemical oscillatory system:Cu │1.0 M TFA. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., 339-342.
https://hdl.handle.net/21.15107/rcub_vinar_9175

Potkonjak TN, Potkonjak NI, Nikolić Z. On the use of voltammetric data in bifurcation analysis of electrochemical oscillatory system:Cu │1.0 M TFA. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry. 2016;:339-342.
https://hdl.handle.net/21.15107/rcub_vinar_9175 .

Potkonjak, Tanja N., Potkonjak, Nebojša I., Nikolić, Z., "On the use of voltammetric data in bifurcation analysis of electrochemical oscillatory system:Cu │1.0 M TFA" in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry (2016):339-342,
https://hdl.handle.net/21.15107/rcub_vinar_9175 .

TY  - THES
AU  - Potkonjak, Nebojša I.
PY  - 2016
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=3886
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:13049/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=47780879
UR  - http://nardus.mpn.gov.rs/123456789/6761
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7308
AB  - Ova doktorska disertacija se bavi potenciodinamičkim ispitivanjem ponašanja struje pri anodnoj polarizaciji bakarne elektrode, u prisistvu 1M CF3COOH (trifluorosirćetna kiselina). Poseban naglasak je dat na ispitivanje strujnih oscilacija koje se generišu u odreĎenoj oblasti potencijala (oscilatorna oblast, oblast OsS). Pojava strujnih oscilacija ukazuje da se elektrohemijski sistem Cu|1M CF3COOH moţe okarakterisati kao strujni elektrohemijski oscilator. Uočena oscilatorna oblast na struja-potencijal polarizacionim krivama se nalazi izmeĎu dve oblasti stabilnih stacionarnih stanja, naime izmeĎu oblasti aktivnog rastvaranja bakarne elektrode (oblast SSS1) i oblasti njene pasivacije (oblast SSS2).Primenom ciklične voltametrije ustanovljeno je da se strujne oscilacije javljaju pri oba smera polarizacije, anodnom i katodnom smeru. Prelaz SSS1OsS karakteriše zanemarljivo mali histerezis (5 mV), dok je širina histerezisa na prelazu OsSSSS2 značajno veća (34 mV). Bifurkaciona analiza je pokazala da se prelaz SSS1OsS odvija preko superkritične Hopfove bifurkacije, dok je prelaz OsSSSS2 okarakterisan homokliničnom bifurkacijom.Tafelova analiza je pokazala da se anodno rastvaranje bakarne elektrode odvija preko mehanizma jednoelektronskog prenosa naelektrisanja. Rendgeno-difrakcionom analizom ustanovljeno je da oksidi bakra (CuO i Cu2O) ne ulaze u sastav pasivnog sloja. Difrakciona refleksija na 2 = 7,95, koja nije mogla biti indeksirana, ulazuje da se u sastavu pasivnog sloja nalazi faza velike elementarne ćelije, najverovatnije so koju čine Cu(I) i/ili Cu(II) trifluoroacetat. Dobijena mikro-porozna struktura površine bakarne elektrode koja je bila izloţena potencijalima unutar oscilatorne oblasti je detektovana primenom mikroskopije atomskih sila, što ukazuje na tačkastu (piting) koroziju.Na osnovu ispitivanja uticaja temperature elektrolitičke ćelije na oscilatorno ponašanje struje, naĎeno je da se unutar temperaturskog intervala 5 – 52 C strujne oscilacije javljaju na polarizacionim krivama; strujne oscilacije nisu bile opaţene kadaje temperatura elektrolitičke ćelije iznosila 55 C...
AB  - This doctoral dissertation deals with potentiodynamic examination of current response during the anodic polarization of copper electrode in the presence of 1M CF3COOH (trifluoroacetic acid). Particular focus is given on investigation of the current oscillations that are generated in certain potential region (oscillatory region, region OsS). Appearance of the current oscillations indicates that the electrochemical system Cu|1M CF3COOH can be classified as a current electrochemical oscillator. The observed oscillatory region at the current-potential polarization curve is situated between two regions of stable steady states, namely between the region of active dissolution of copper electrode (region SSS1) and the region of its passivation (region SSS2).It was determined that the current oscillations occur in anodic and cathodic direction of polarization, by applying of cyclic voltammetry. The transition SSS1OsS is characterized by negligible hysteresis (5 mV), while the width of hysteresis at the transition OsSSSS2 is significantly higher (34 mV). Bifurcation analysis showed that the transition SSS1OsS goes via supercritical Hopf bifurcation, while the transition OsSSSS2 is characterize by homoclinic bifurcation.The Tafel analysis showed that the anodic dissolution of copper electrode immersed in 1M CF3COOH goes via one-electron charge transfer step. X-ray diffraction analysis showed absence of copper oxides (Cu2O and CuO) in passive layer. Diffraction reflections at 2 = 7.95, which could not be indexed, indicates presence of phase with large unit cell in passive layer, most probably salt composed of Cu(I) or/and Cu(II) trifluoroacetate. Obtained micro-porous structure of the copper electrode surface, which was exposed to potentials within oscillatory region was detected by using atomic force microscopy, this indicates a pitting corrosion.Based on the investigation of the temperature effect on current oscillatory behavior, it was found that within temperature interval ranged from 5 °C to 52 °C,current oscillations occur on polarization curves...
PB  - Универзитет у Београду, Факултет за физичку хемију
T2  - Универзитет у Београду
T1  - Strujni elektrohemijski oscilator
T1  - Current electrochemical oscillator
UR  - https://hdl.handle.net/21.15107/rcub_nardus_6761
ER  - 

@phdthesis{
author = "Potkonjak, Nebojša I.",
year = "2016",
abstract = "Ova doktorska disertacija se bavi potenciodinamičkim ispitivanjem ponašanja struje pri anodnoj polarizaciji bakarne elektrode, u prisistvu 1M CF3COOH (trifluorosirćetna kiselina). Poseban naglasak je dat na ispitivanje strujnih oscilacija koje se generišu u odreĎenoj oblasti potencijala (oscilatorna oblast, oblast OsS). Pojava strujnih oscilacija ukazuje da se elektrohemijski sistem Cu|1M CF3COOH moţe okarakterisati kao strujni elektrohemijski oscilator. Uočena oscilatorna oblast na struja-potencijal polarizacionim krivama se nalazi izmeĎu dve oblasti stabilnih stacionarnih stanja, naime izmeĎu oblasti aktivnog rastvaranja bakarne elektrode (oblast SSS1) i oblasti njene pasivacije (oblast SSS2).Primenom ciklične voltametrije ustanovljeno je da se strujne oscilacije javljaju pri oba smera polarizacije, anodnom i katodnom smeru. Prelaz SSS1OsS karakteriše zanemarljivo mali histerezis (5 mV), dok je širina histerezisa na prelazu OsSSSS2 značajno veća (34 mV). Bifurkaciona analiza je pokazala da se prelaz SSS1OsS odvija preko superkritične Hopfove bifurkacije, dok je prelaz OsSSSS2 okarakterisan homokliničnom bifurkacijom.Tafelova analiza je pokazala da se anodno rastvaranje bakarne elektrode odvija preko mehanizma jednoelektronskog prenosa naelektrisanja. Rendgeno-difrakcionom analizom ustanovljeno je da oksidi bakra (CuO i Cu2O) ne ulaze u sastav pasivnog sloja. Difrakciona refleksija na 2 = 7,95, koja nije mogla biti indeksirana, ulazuje da se u sastavu pasivnog sloja nalazi faza velike elementarne ćelije, najverovatnije so koju čine Cu(I) i/ili Cu(II) trifluoroacetat. Dobijena mikro-porozna struktura površine bakarne elektrode koja je bila izloţena potencijalima unutar oscilatorne oblasti je detektovana primenom mikroskopije atomskih sila, što ukazuje na tačkastu (piting) koroziju.Na osnovu ispitivanja uticaja temperature elektrolitičke ćelije na oscilatorno ponašanje struje, naĎeno je da se unutar temperaturskog intervala 5 – 52 C strujne oscilacije javljaju na polarizacionim krivama; strujne oscilacije nisu bile opaţene kadaje temperatura elektrolitičke ćelije iznosila 55 C..., This doctoral dissertation deals with potentiodynamic examination of current response during the anodic polarization of copper electrode in the presence of 1M CF3COOH (trifluoroacetic acid). Particular focus is given on investigation of the current oscillations that are generated in certain potential region (oscillatory region, region OsS). Appearance of the current oscillations indicates that the electrochemical system Cu|1M CF3COOH can be classified as a current electrochemical oscillator. The observed oscillatory region at the current-potential polarization curve is situated between two regions of stable steady states, namely between the region of active dissolution of copper electrode (region SSS1) and the region of its passivation (region SSS2).It was determined that the current oscillations occur in anodic and cathodic direction of polarization, by applying of cyclic voltammetry. The transition SSS1OsS is characterized by negligible hysteresis (5 mV), while the width of hysteresis at the transition OsSSSS2 is significantly higher (34 mV). Bifurcation analysis showed that the transition SSS1OsS goes via supercritical Hopf bifurcation, while the transition OsSSSS2 is characterize by homoclinic bifurcation.The Tafel analysis showed that the anodic dissolution of copper electrode immersed in 1M CF3COOH goes via one-electron charge transfer step. X-ray diffraction analysis showed absence of copper oxides (Cu2O and CuO) in passive layer. Diffraction reflections at 2 = 7.95, which could not be indexed, indicates presence of phase with large unit cell in passive layer, most probably salt composed of Cu(I) or/and Cu(II) trifluoroacetate. Obtained micro-porous structure of the copper electrode surface, which was exposed to potentials within oscillatory region was detected by using atomic force microscopy, this indicates a pitting corrosion.Based on the investigation of the temperature effect on current oscillatory behavior, it was found that within temperature interval ranged from 5 °C to 52 °C,current oscillations occur on polarization curves...",
publisher = "Универзитет у Београду, Факултет за физичку хемију",
journal = "Универзитет у Београду",
title = "Strujni elektrohemijski oscilator, Current electrochemical oscillator",
url = "https://hdl.handle.net/21.15107/rcub_nardus_6761"
}

Potkonjak, N. I.. (2016). Strujni elektrohemijski oscilator. in Универзитет у Београду
Универзитет у Београду, Факултет за физичку хемију..
https://hdl.handle.net/21.15107/rcub_nardus_6761

Potkonjak NI. Strujni elektrohemijski oscilator. in Универзитет у Београду. 2016;.
https://hdl.handle.net/21.15107/rcub_nardus_6761 .

Potkonjak, Nebojša I., "Strujni elektrohemijski oscilator" in Универзитет у Београду (2016),
https://hdl.handle.net/21.15107/rcub_nardus_6761 .

TY  - CONF
AU  - Potkonjak, Nebojša I.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9263
AB  - Michael Pupin is a great Serbian-American inventor, professor and scientist;
best known for his huge contributions to the development of modern
telecommunication and X-ray imaging. Less is known that his doctoral
dissertation falls within a scope of physical chemistry. Pupin΄s doctoral
dissertation, entitled Osmotic pressure and his relationship to free energy
was conducted under the mentorship of Helmholtz; can be considered as a
pioneer theoretical research in a particular field of physical chemistry,
chemical thermodynamics. Aim of this study is to draw public attention on
the contribution of the celebrated Pupin to physical chemistry
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
T1  - Michael Pupin and physical chemistry
SP  - 855
EP  - 862
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9263
ER  - 

@conference{
author = "Potkonjak, Nebojša I.",
year = "2016",
abstract = "Michael Pupin is a great Serbian-American inventor, professor and scientist;
best known for his huge contributions to the development of modern
telecommunication and X-ray imaging. Less is known that his doctoral
dissertation falls within a scope of physical chemistry. Pupin΄s doctoral
dissertation, entitled Osmotic pressure and his relationship to free energy
was conducted under the mentorship of Helmholtz; can be considered as a
pioneer theoretical research in a particular field of physical chemistry,
chemical thermodynamics. Aim of this study is to draw public attention on
the contribution of the celebrated Pupin to physical chemistry",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry",
title = "Michael Pupin and physical chemistry",
pages = "855-862",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9263"
}

Potkonjak, N. I.. (2016). Michael Pupin and physical chemistry. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., 855-862.
https://hdl.handle.net/21.15107/rcub_vinar_9263

Potkonjak NI. Michael Pupin and physical chemistry. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry. 2016;:855-862.
https://hdl.handle.net/21.15107/rcub_vinar_9263 .

Potkonjak, Nebojša I., "Michael Pupin and physical chemistry" in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry (2016):855-862,
https://hdl.handle.net/21.15107/rcub_vinar_9263 .

TY  - CONF
AU  - Potkonjak, Nebojša I.
AU  - Blagojević, Stevan N.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9264
AB  - The influence of hydroxycinnamic acids (HCA): caffeic acid, chlorogenic
acid, and p-coumaric acid, on the potassium iodide/hydrogen peroxide
system was investigated. A linear correlation between absorption maximum
of triiodide (I3
-) at 351 nm and HCA concentration was found. In the
presence of HCA, reaction yield of I3
- was found to increase in following
order p-cumaric < chlorogenic ≤ caffeic acid. This is attributing to their oxyradical
scavenging activity. Results obtained in this study have showed
correlation between antioxidant activities of HCA and their ability to
enhanced I3
- production.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Influence of hydroxycinnamic acids on the oxy-radical generated iodide/hydrogen peroxide reaction system
VL  - N-04-P
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9264
ER  - 

@conference{
author = "Potkonjak, Nebojša I. and Blagojević, Stevan N.",
year = "2014",
abstract = "The influence of hydroxycinnamic acids (HCA): caffeic acid, chlorogenic
acid, and p-coumaric acid, on the potassium iodide/hydrogen peroxide
system was investigated. A linear correlation between absorption maximum
of triiodide (I3
-) at 351 nm and HCA concentration was found. In the
presence of HCA, reaction yield of I3
- was found to increase in following
order p-cumaric < chlorogenic ≤ caffeic acid. This is attributing to their oxyradical
scavenging activity. Results obtained in this study have showed
correlation between antioxidant activities of HCA and their ability to
enhanced I3
- production.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Influence of hydroxycinnamic acids on the oxy-radical generated iodide/hydrogen peroxide reaction system",
volume = "N-04-P",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9264"
}

Potkonjak, N. I.,& Blagojević, S. N.. (2014). Influence of hydroxycinnamic acids on the oxy-radical generated iodide/hydrogen peroxide reaction system. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., N-04-P.
https://hdl.handle.net/21.15107/rcub_vinar_9264

Potkonjak NI, Blagojević SN. Influence of hydroxycinnamic acids on the oxy-radical generated iodide/hydrogen peroxide reaction system. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2014;N-04-P.
https://hdl.handle.net/21.15107/rcub_vinar_9264 .

Potkonjak, Nebojša I., Blagojević, Stevan N., "Influence of hydroxycinnamic acids on the oxy-radical generated iodide/hydrogen peroxide reaction system" in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, N-04-P (2014),
https://hdl.handle.net/21.15107/rcub_vinar_9264 .

TY  - CONF
AU  - Blagojević, Bratislav
AU  - Gajinov, Spasenka
AU  - Potkonjak, Nebojša I.
AU  - Blagojević, Slavica M.
AU  - Pejić, Nataša
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9256
AB  - The performances of mixtures of different surfactants: anionic (sodium
lauryl ether sulfate (SLES) and ά-olefin sulfonates (AOS), amphoteric (coco
betaine) and nonionic (coco amide, amine oxide, AO and various etoxylated
alcohols, C12-C15-7EO, C10-7EO and C9-C11-7EO), were studied. The
parameters measured were critical micelle concentration (CMC) and surface
tension of particular tenside mixture. The combination of SLES/AOS/C9-
C11-7EO/AO at ratio 75/15/7/3 achieved the lowest both the CMC and
surface tension compared to the other examined tenside mixtures
(SLES/AOS, SLES/AOS/coco betaine/AO, SLES/AOS/coco amide/AO,
SLES/AOS/C12-C15-7EO/AO and SLES/AOS/C10-7EO/AO). This study
showed that adding nonionic tenside (alcohol ethoxylate, C9-C11-7EO)
improved SLES/AOS foaming properties, synergism in detergency between
them. The reduction in the surface tension was obtained, thus indicated that
alcohol ethoxylate, C12-C15-7EO, C10-7EO and C9-C11-7EO can be used
to produce better cleaning products.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Determination of tenside mixtures efficiency: conductometric and stalagmometric investigation
VL  - L-08-P
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9256
ER  - 

@conference{
author = "Blagojević, Bratislav and Gajinov, Spasenka and Potkonjak, Nebojša I. and Blagojević, Slavica M. and Pejić, Nataša",
year = "2014",
abstract = "The performances of mixtures of different surfactants: anionic (sodium
lauryl ether sulfate (SLES) and ά-olefin sulfonates (AOS), amphoteric (coco
betaine) and nonionic (coco amide, amine oxide, AO and various etoxylated
alcohols, C12-C15-7EO, C10-7EO and C9-C11-7EO), were studied. The
parameters measured were critical micelle concentration (CMC) and surface
tension of particular tenside mixture. The combination of SLES/AOS/C9-
C11-7EO/AO at ratio 75/15/7/3 achieved the lowest both the CMC and
surface tension compared to the other examined tenside mixtures
(SLES/AOS, SLES/AOS/coco betaine/AO, SLES/AOS/coco amide/AO,
SLES/AOS/C12-C15-7EO/AO and SLES/AOS/C10-7EO/AO). This study
showed that adding nonionic tenside (alcohol ethoxylate, C9-C11-7EO)
improved SLES/AOS foaming properties, synergism in detergency between
them. The reduction in the surface tension was obtained, thus indicated that
alcohol ethoxylate, C12-C15-7EO, C10-7EO and C9-C11-7EO can be used
to produce better cleaning products.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Determination of tenside mixtures efficiency: conductometric and stalagmometric investigation",
volume = "L-08-P",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9256"
}

Blagojević, B., Gajinov, S., Potkonjak, N. I., Blagojević, S. M.,& Pejić, N.. (2014). Determination of tenside mixtures efficiency: conductometric and stalagmometric investigation. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., L-08-P.
https://hdl.handle.net/21.15107/rcub_vinar_9256

Blagojević B, Gajinov S, Potkonjak NI, Blagojević SM, Pejić N. Determination of tenside mixtures efficiency: conductometric and stalagmometric investigation. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2014;L-08-P.
https://hdl.handle.net/21.15107/rcub_vinar_9256 .

Blagojević, Bratislav, Gajinov, Spasenka, Potkonjak, Nebojša I., Blagojević, Slavica M., Pejić, Nataša, "Determination of tenside mixtures efficiency: conductometric and stalagmometric investigation" in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, L-08-P (2014),
https://hdl.handle.net/21.15107/rcub_vinar_9256 .

TY  - JOUR
AU  - Potkonjak, Nebojša I.
AU  - Nikolić, Zoran M.
AU  - Anić, Slobodan R.
AU  - Minić, Dragica M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5978
AB  - Complex oscillatory behavior of electric current and electrode potential were observed during potentiodynamic anodic polarization of Cu in 1 M TFA, applying the current interrupt method for IR drop compensation. This oscillatory behavior was found to give an electrochemical response in the form of a polarization curve with continuous loop. The results presented show that the current interrupt method is capable of eliminating the entire IR drop. Under such conditions, oscillations of the applied potential are in fact those of the double-layer potential. Theoretically predicted interplay between oscillatory behavior of the double-layer potential and the electric current is experimentally demonstrated. (C) 2014 Elsevier Ltd. All rights reserved.
T2  - Corrosion Science
T1  - Electrochemical oscillations during copper electrodissolution/passivation in trifluoroacetic acid induced by current interrupt method
VL  - 83
SP  - 355
EP  - 358
DO  - 10.1016/j.corsci.2014.02.034
ER  - 

@article{
author = "Potkonjak, Nebojša I. and Nikolić, Zoran M. and Anić, Slobodan R. and Minić, Dragica M.",
year = "2014",
abstract = "Complex oscillatory behavior of electric current and electrode potential were observed during potentiodynamic anodic polarization of Cu in 1 M TFA, applying the current interrupt method for IR drop compensation. This oscillatory behavior was found to give an electrochemical response in the form of a polarization curve with continuous loop. The results presented show that the current interrupt method is capable of eliminating the entire IR drop. Under such conditions, oscillations of the applied potential are in fact those of the double-layer potential. Theoretically predicted interplay between oscillatory behavior of the double-layer potential and the electric current is experimentally demonstrated. (C) 2014 Elsevier Ltd. All rights reserved.",
journal = "Corrosion Science",
title = "Electrochemical oscillations during copper electrodissolution/passivation in trifluoroacetic acid induced by current interrupt method",
volume = "83",
pages = "355-358",
doi = "10.1016/j.corsci.2014.02.034"
}

Potkonjak, N. I., Nikolić, Z. M., Anić, S. R.,& Minić, D. M.. (2014). Electrochemical oscillations during copper electrodissolution/passivation in trifluoroacetic acid induced by current interrupt method. in Corrosion Science, 83, 355-358.
https://doi.org/10.1016/j.corsci.2014.02.034

Potkonjak NI, Nikolić ZM, Anić SR, Minić DM. Electrochemical oscillations during copper electrodissolution/passivation in trifluoroacetic acid induced by current interrupt method. in Corrosion Science. 2014;83:355-358.
doi:10.1016/j.corsci.2014.02.034 .

Potkonjak, Nebojša I., Nikolić, Zoran M., Anić, Slobodan R., Minić, Dragica M., "Electrochemical oscillations during copper electrodissolution/passivation in trifluoroacetic acid induced by current interrupt method" in Corrosion Science, 83 (2014):355-358,
https://doi.org/10.1016/j.corsci.2014.02.034 . .

TY  - JOUR
AU  - Milenković, Maja C.
AU  - Potkonjak, Nebojša I.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/232
AB  - The influence of hydroxycinnamic acids (HCA) on the oxy-radical generated system, potassium iodide/hydrogen peroxide, was investigated through the enhancement of triiodide (I-3(-)) yield. Caffeic acid, clilorogenic acid, and p-coumaric acid were used as typical representatives of HCA. A linear correlation, with positive slopes, was found between absorption maximum of I-3(-) at 351 urn and HCA concentration in all cases. The magnitude of enhanced I-3(-) production was found to increase in the following order: p-coumaric acid LT chlorogenic acid LT = caffeic acid. A reaction mechanism, which includes negative influence of oxygen-centered free radicals on the I-3(-) yield, was proposed. The enhanced production of I-3(-) by HCA is attributed to their radical scavenging activity. Supported by literature data, results obtained in this study have showed the correlation between radical scavenging activities of HCA and their ability to enhanced I-3(-) generation.
T2  - Bulletin of the Chemical Society of Japan
T1  - The Effect of Hydroxycinnamic Acids on Oxy-Radical Generating Iodide-Hydrogen Peroxide Reaction
VL  - 87
IS  - 11
SP  - 1255
EP  - 1259
DO  - 10.1246/bcsj.20140175
ER  - 

@article{
author = "Milenković, Maja C. and Potkonjak, Nebojša I.",
year = "2014",
abstract = "The influence of hydroxycinnamic acids (HCA) on the oxy-radical generated system, potassium iodide/hydrogen peroxide, was investigated through the enhancement of triiodide (I-3(-)) yield. Caffeic acid, clilorogenic acid, and p-coumaric acid were used as typical representatives of HCA. A linear correlation, with positive slopes, was found between absorption maximum of I-3(-) at 351 urn and HCA concentration in all cases. The magnitude of enhanced I-3(-) production was found to increase in the following order: p-coumaric acid LT chlorogenic acid LT = caffeic acid. A reaction mechanism, which includes negative influence of oxygen-centered free radicals on the I-3(-) yield, was proposed. The enhanced production of I-3(-) by HCA is attributed to their radical scavenging activity. Supported by literature data, results obtained in this study have showed the correlation between radical scavenging activities of HCA and their ability to enhanced I-3(-) generation.",
journal = "Bulletin of the Chemical Society of Japan",
title = "The Effect of Hydroxycinnamic Acids on Oxy-Radical Generating Iodide-Hydrogen Peroxide Reaction",
volume = "87",
number = "11",
pages = "1255-1259",
doi = "10.1246/bcsj.20140175"
}

Milenković, M. C.,& Potkonjak, N. I.. (2014). The Effect of Hydroxycinnamic Acids on Oxy-Radical Generating Iodide-Hydrogen Peroxide Reaction. in Bulletin of the Chemical Society of Japan, 87(11), 1255-1259.
https://doi.org/10.1246/bcsj.20140175

Milenković MC, Potkonjak NI. The Effect of Hydroxycinnamic Acids on Oxy-Radical Generating Iodide-Hydrogen Peroxide Reaction. in Bulletin of the Chemical Society of Japan. 2014;87(11):1255-1259.
doi:10.1246/bcsj.20140175 .

Milenković, Maja C., Potkonjak, Nebojša I., "The Effect of Hydroxycinnamic Acids on Oxy-Radical Generating Iodide-Hydrogen Peroxide Reaction" in Bulletin of the Chemical Society of Japan, 87, no. 11 (2014):1255-1259,
https://doi.org/10.1246/bcsj.20140175 . .

TY  - JOUR
AU  - Potkonjak, Nebojša I.
AU  - Veselinović, Dragan S.
AU  - Novaković, Miroslav M.
AU  - Gorjanovic, Stanislava Z.
AU  - Pezo, Lato
AU  - Sužnjevicć, Desanka Ž.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5101
AB  - Antioxidant activity (AO) of commercial propolis extracts (PEs), available on Serbian market, was determined by direct current (DC) polarography. Polarographic anodic current of 5.0 mmol L-1 alkaline solution of H2O2 was recorded at potentials of mercury dissolution. Decrease of the current was plotted against the volume of gradually added PEs. The volume of PE causing 20% current decrease was determined from the linear part of the plot. Antioxidant activity was expressed in H2O2 equivalent (HPEq), representing the volume of PE that corresponds to 1.0 mmol L-1 H2O2 decrease. Resulting HPEq ranged between 1.71 +/- 0.11 and 8.00 +/- 0.18 mu L. Range of 1,1-dipheny1-2-picryl hydrazyl (DPPH) radical scavenging activity was from 0.093 +/- 0.004% to 0.346 +/- 0.006%. Total phenolic content (TCP) of PE with superior AO activity was 5.31 +/- 0.05%g GAE, while the extract with the lowest activity contained 1.45 +/- 0.02%g GAE. Antioxidant activity, determined by polarographic method, was correlated with DPPH scavenging activity (R-2 = 0.991) and TCP (R-2 = 0.985). Validity of obtained results was further confirmed using ANOVA and post hoc Tukey HSD test. (C) 2012 Elsevier Ltd. All rights reserved.
T2  - Food and Chemical Toxicology
T1  - Antioxidant activity of propolis extracts from Serbia: A polarographic approach
VL  - 50
IS  - 10
SP  - 3614
EP  - 3618
DO  - 10.1016/j.fct.2012.07.029
ER  - 

@article{
author = "Potkonjak, Nebojša I. and Veselinović, Dragan S. and Novaković, Miroslav M. and Gorjanovic, Stanislava Z. and Pezo, Lato and Sužnjevicć, Desanka Ž.",
year = "2012",
abstract = "Antioxidant activity (AO) of commercial propolis extracts (PEs), available on Serbian market, was determined by direct current (DC) polarography. Polarographic anodic current of 5.0 mmol L-1 alkaline solution of H2O2 was recorded at potentials of mercury dissolution. Decrease of the current was plotted against the volume of gradually added PEs. The volume of PE causing 20% current decrease was determined from the linear part of the plot. Antioxidant activity was expressed in H2O2 equivalent (HPEq), representing the volume of PE that corresponds to 1.0 mmol L-1 H2O2 decrease. Resulting HPEq ranged between 1.71 +/- 0.11 and 8.00 +/- 0.18 mu L. Range of 1,1-dipheny1-2-picryl hydrazyl (DPPH) radical scavenging activity was from 0.093 +/- 0.004% to 0.346 +/- 0.006%. Total phenolic content (TCP) of PE with superior AO activity was 5.31 +/- 0.05%g GAE, while the extract with the lowest activity contained 1.45 +/- 0.02%g GAE. Antioxidant activity, determined by polarographic method, was correlated with DPPH scavenging activity (R-2 = 0.991) and TCP (R-2 = 0.985). Validity of obtained results was further confirmed using ANOVA and post hoc Tukey HSD test. (C) 2012 Elsevier Ltd. All rights reserved.",
journal = "Food and Chemical Toxicology",
title = "Antioxidant activity of propolis extracts from Serbia: A polarographic approach",
volume = "50",
number = "10",
pages = "3614-3618",
doi = "10.1016/j.fct.2012.07.029"
}

Potkonjak, N. I., Veselinović, D. S., Novaković, M. M., Gorjanovic, S. Z., Pezo, L.,& Sužnjevicć, D. Ž.. (2012). Antioxidant activity of propolis extracts from Serbia: A polarographic approach. in Food and Chemical Toxicology, 50(10), 3614-3618.
https://doi.org/10.1016/j.fct.2012.07.029

Potkonjak NI, Veselinović DS, Novaković MM, Gorjanovic SZ, Pezo L, Sužnjevicć DŽ. Antioxidant activity of propolis extracts from Serbia: A polarographic approach. in Food and Chemical Toxicology. 2012;50(10):3614-3618.
doi:10.1016/j.fct.2012.07.029 .

Potkonjak, Nebojša I., Veselinović, Dragan S., Novaković, Miroslav M., Gorjanovic, Stanislava Z., Pezo, Lato, Sužnjevicć, Desanka Ž., "Antioxidant activity of propolis extracts from Serbia: A polarographic approach" in Food and Chemical Toxicology, 50, no. 10 (2012):3614-3618,
https://doi.org/10.1016/j.fct.2012.07.029 . .

TY  - JOUR
AU  - Marčeta Kaninski, Milica
AU  - Nikolić, Vladimir M.
AU  - Potkonjak, Tanja N.
AU  - Simonović, Branislav R.
AU  - Potkonjak, Nebojša I.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3185
AB  - In continuous search for advanced electrocatalytic materials for the hydrogen evolution reaction (HER), based on transition metal series, two types of intermetallic compounds, TiPt and MoPt2, were investigated as cathode materials. Additionally, ionic activator (i.a.), the mixture of Na-molybdate and tris(ethylenediamine)Co(III) chloride, was in situ added into electrolyte, 6 M aqueous potassium hydroxide solution. The objective was to qualitatively compare their electrocatalytic efficiency evaluated by quasi-potentiostatic and galvanostatic technique. Results are presented to show: the Tafel slope, the exchange current density, the overpotential needed for a fixed hydrogen production rate and the apparent energy of activation. Obtained kinetic parameters reveal advanced catalytic ability of the MoPt2 over the TiPt cathode towards HER. Also, important step forward was achieved by using ionic activator. The presence of Mo and Co species attached to the cathode surface was confirmed by XRF analysis. Thus, enhanced catalytic activity was assigned to the formation of Mo-Co-based electrodeposit. Results suggest to significant catalytic performance of the MoPt2 cathode specially if used with ionic activator in alkaline water electrolysis. (c) 2007 Elsevier B.V. All rights reserved.
T2  - Applied Catalysis. A: General
T1  - Catalytic activity of Pt-based intermetallics for the hydrogen production - Influence of ionic activator
VL  - 321
IS  - 1
SP  - 93
EP  - 99
DO  - 10.1016/j.apcata.2007.01.036
ER  - 

@article{
author = "Marčeta Kaninski, Milica and Nikolić, Vladimir M. and Potkonjak, Tanja N. and Simonović, Branislav R. and Potkonjak, Nebojša I.",
year = "2007",
abstract = "In continuous search for advanced electrocatalytic materials for the hydrogen evolution reaction (HER), based on transition metal series, two types of intermetallic compounds, TiPt and MoPt2, were investigated as cathode materials. Additionally, ionic activator (i.a.), the mixture of Na-molybdate and tris(ethylenediamine)Co(III) chloride, was in situ added into electrolyte, 6 M aqueous potassium hydroxide solution. The objective was to qualitatively compare their electrocatalytic efficiency evaluated by quasi-potentiostatic and galvanostatic technique. Results are presented to show: the Tafel slope, the exchange current density, the overpotential needed for a fixed hydrogen production rate and the apparent energy of activation. Obtained kinetic parameters reveal advanced catalytic ability of the MoPt2 over the TiPt cathode towards HER. Also, important step forward was achieved by using ionic activator. The presence of Mo and Co species attached to the cathode surface was confirmed by XRF analysis. Thus, enhanced catalytic activity was assigned to the formation of Mo-Co-based electrodeposit. Results suggest to significant catalytic performance of the MoPt2 cathode specially if used with ionic activator in alkaline water electrolysis. (c) 2007 Elsevier B.V. All rights reserved.",
journal = "Applied Catalysis. A: General",
title = "Catalytic activity of Pt-based intermetallics for the hydrogen production - Influence of ionic activator",
volume = "321",
number = "1",
pages = "93-99",
doi = "10.1016/j.apcata.2007.01.036"
}

Marčeta Kaninski, M., Nikolić, V. M., Potkonjak, T. N., Simonović, B. R.,& Potkonjak, N. I.. (2007). Catalytic activity of Pt-based intermetallics for the hydrogen production - Influence of ionic activator. in Applied Catalysis. A: General, 321(1), 93-99.
https://doi.org/10.1016/j.apcata.2007.01.036

Marčeta Kaninski M, Nikolić VM, Potkonjak TN, Simonović BR, Potkonjak NI. Catalytic activity of Pt-based intermetallics for the hydrogen production - Influence of ionic activator. in Applied Catalysis. A: General. 2007;321(1):93-99.
doi:10.1016/j.apcata.2007.01.036 .

Marčeta Kaninski, Milica, Nikolić, Vladimir M., Potkonjak, Tanja N., Simonović, Branislav R., Potkonjak, Nebojša I., "Catalytic activity of Pt-based intermetallics for the hydrogen production - Influence of ionic activator" in Applied Catalysis. A: General, 321, no. 1 (2007):93-99,
https://doi.org/10.1016/j.apcata.2007.01.036 . .

TY  - JOUR
AU  - Mijanic, Seepan S.
AU  - Maksić, Aleksandar
AU  - Potkonjak, Nebojša I.
AU  - Marčeta Kaninski, Milica
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3290
AB  - The aim of this work was to investigate efficiency of the electrolytic separation of hydrogen isotopes (D/H), from alkaline 6 M KOH solution as standard electrolyte, on the Mo-Pt intermetallic phases as cathode materials. We measured the isotope separation factor (alpha) of the single-stage process, as a basic parameter determining the isotope separation efficiency. Furthermore, we have found that some combinations of activating compounds (ionic activators added directly into the electrolyte, assuming in situ activation) can reduce energy needs per mass unit of hydrogen produced, as well as the isotope separation efficiency, compared to those of the standard electrolyte. Also, the electrocatalytic ability of Mo-Pt intermetallic phases for the hydrogen evolution was investigated and evaluated at fixed over-potential (energy input) trough measured current density. Such investigations offer a possibility to optimize the electrolytic process, based on a significant upgrade of the efficiency regarding two needs: hydrogen production and isotope separation. (c) 2007 Elsevier B.V. All rights reserved.
T2  - Electrochemistry Communications
T1  - Electrolytic D/H isotope separation efficiency and electrocatalytic activity of Mo-Pt intermetallic phases
VL  - 9
IS  - 9
SP  - 2179
EP  - 2184
DO  - 10.1016/j.elecom.2007.05.017
ER  - 

@article{
author = "Mijanic, Seepan S. and Maksić, Aleksandar and Potkonjak, Nebojša I. and Marčeta Kaninski, Milica",
year = "2007",
abstract = "The aim of this work was to investigate efficiency of the electrolytic separation of hydrogen isotopes (D/H), from alkaline 6 M KOH solution as standard electrolyte, on the Mo-Pt intermetallic phases as cathode materials. We measured the isotope separation factor (alpha) of the single-stage process, as a basic parameter determining the isotope separation efficiency. Furthermore, we have found that some combinations of activating compounds (ionic activators added directly into the electrolyte, assuming in situ activation) can reduce energy needs per mass unit of hydrogen produced, as well as the isotope separation efficiency, compared to those of the standard electrolyte. Also, the electrocatalytic ability of Mo-Pt intermetallic phases for the hydrogen evolution was investigated and evaluated at fixed over-potential (energy input) trough measured current density. Such investigations offer a possibility to optimize the electrolytic process, based on a significant upgrade of the efficiency regarding two needs: hydrogen production and isotope separation. (c) 2007 Elsevier B.V. All rights reserved.",
journal = "Electrochemistry Communications",
title = "Electrolytic D/H isotope separation efficiency and electrocatalytic activity of Mo-Pt intermetallic phases",
volume = "9",
number = "9",
pages = "2179-2184",
doi = "10.1016/j.elecom.2007.05.017"
}

Mijanic, S. S., Maksić, A., Potkonjak, N. I.,& Marčeta Kaninski, M.. (2007). Electrolytic D/H isotope separation efficiency and electrocatalytic activity of Mo-Pt intermetallic phases. in Electrochemistry Communications, 9(9), 2179-2184.
https://doi.org/10.1016/j.elecom.2007.05.017

Mijanic SS, Maksić A, Potkonjak NI, Marčeta Kaninski M. Electrolytic D/H isotope separation efficiency and electrocatalytic activity of Mo-Pt intermetallic phases. in Electrochemistry Communications. 2007;9(9):2179-2184.
doi:10.1016/j.elecom.2007.05.017 .

Mijanic, Seepan S., Maksić, Aleksandar, Potkonjak, Nebojša I., Marčeta Kaninski, Milica, "Electrolytic D/H isotope separation efficiency and electrocatalytic activity of Mo-Pt intermetallic phases" in Electrochemistry Communications, 9, no. 9 (2007):2179-2184,
https://doi.org/10.1016/j.elecom.2007.05.017 . .

TY  - CONF
AU  - Potkonjak, Nebojša I.
AU  - Nikolić, Vladimir M.
AU  - Blagojević, Stevan N.
AU  - Simonović, Branislav R.
AU  - Potkonjak, Tanja N.
AU  - Marčeta Kaninski, Milica
AU  - Sužnjević, Desanka Ž.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9419
AB  - Enhancement of the electrocatalytic effect of Ni electrode for hydrogen evolution reaction (HER) by co-electrodeposited V and Co at metallic Ni (Ni-V-Co) was studied by using quasi-potentiostatic polarization technique from 1 M KOH at 25 ºC. The obtained exchange current density for HER with Ni-V-Co electrode, (5.5x10-4 Acm-2), is about two orders of magnitude higher than for metallic Ni electrode. The results suggested the existence of the synergetic effect of V and Co deposit on the catalytic activity of Ni electrode for HER. By using X-ray fluorescence (XRF) analysis the presence of Co and V at metallic Ni support was proved.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry
T1  - Enhancement of the electrocatalytic activity of Ni electrode for hydrogen evolution by electrodeposited V and Co on its surface
SP  - 335
EP  - 337
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9419
ER  - 

@conference{
author = "Potkonjak, Nebojša I. and Nikolić, Vladimir M. and Blagojević, Stevan N. and Simonović, Branislav R. and Potkonjak, Tanja N. and Marčeta Kaninski, Milica and Sužnjević, Desanka Ž.",
year = "2006",
abstract = "Enhancement of the electrocatalytic effect of Ni electrode for hydrogen evolution reaction (HER) by co-electrodeposited V and Co at metallic Ni (Ni-V-Co) was studied by using quasi-potentiostatic polarization technique from 1 M KOH at 25 ºC. The obtained exchange current density for HER with Ni-V-Co electrode, (5.5x10-4 Acm-2), is about two orders of magnitude higher than for metallic Ni electrode. The results suggested the existence of the synergetic effect of V and Co deposit on the catalytic activity of Ni electrode for HER. By using X-ray fluorescence (XRF) analysis the presence of Co and V at metallic Ni support was proved.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry",
title = "Enhancement of the electrocatalytic activity of Ni electrode for hydrogen evolution by electrodeposited V and Co on its surface",
pages = "335-337",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9419"
}

Potkonjak, N. I., Nikolić, V. M., Blagojević, S. N., Simonović, B. R., Potkonjak, T. N., Marčeta Kaninski, M.,& Sužnjević, D. Ž.. (2006). Enhancement of the electrocatalytic activity of Ni electrode for hydrogen evolution by electrodeposited V and Co on its surface. in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry
Society of Physical Chemists of Serbia., 335-337.
https://hdl.handle.net/21.15107/rcub_vinar_9419

Potkonjak NI, Nikolić VM, Blagojević SN, Simonović BR, Potkonjak TN, Marčeta Kaninski M, Sužnjević DŽ. Enhancement of the electrocatalytic activity of Ni electrode for hydrogen evolution by electrodeposited V and Co on its surface. in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry. 2006;:335-337.
https://hdl.handle.net/21.15107/rcub_vinar_9419 .

Potkonjak, Nebojša I., Nikolić, Vladimir M., Blagojević, Stevan N., Simonović, Branislav R., Potkonjak, Tanja N., Marčeta Kaninski, Milica, Sužnjević, Desanka Ž., "Enhancement of the electrocatalytic activity of Ni electrode for hydrogen evolution by electrodeposited V and Co on its surface" in Physical chemistry 2006: 8th international conference on fundemental and applied aspract of physical chemistry (2006):335-337,
https://hdl.handle.net/21.15107/rcub_vinar_9419 .

TY  - JOUR
AU  - Marčeta Kaninski, Milica
AU  - Stojić, Dragica Lj.
AU  - Šaponjić, Đorđe
AU  - Potkonjak, Nebojša I.
AU  - Miljanić, Šćepan S.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6588
AB  - Hydrogen is one of the most widely produced commodities in the world economy. The basic technologies for producing hydrogen via the electrolysis of water have long been known. However, there are disadvantages when using this process. Two-thirds of the operation costs of the electrolyzers are electricity costs. The challenge, addressed.by numerous companies and researchers in the last few years, is the cost cutting by increasing efficiency of the process. The aim of this work was the attempt to optimize the electrolytic hydrogen production from alkaline solution, through the variation of cathode materials and use of ionic activators. The part of our results shows the better electrocatalytic activity of intermetallic phases and the energy consumption is decreased when compared with the industrial data (4.5-5 kWh m(-3) H-2). The role of ionic activator used is also very significant. These results give the opportunity for further research of cumulative effect of the intermetallic electrodes and ionic activators on industrial level. (c) 2005 Elsevier B.V. All rights reserved.
T2  - Journal of Power Sources
T1  - Comparison of different electrode materials - Energy requirements in the electrolytic hydrogen evolution process
VL  - 157
IS  - 2
SP  - 758
EP  - 764
DO  - 10.1016/j.jpowsour.2005.10.105
ER  - 

@article{
author = "Marčeta Kaninski, Milica and Stojić, Dragica Lj. and Šaponjić, Đorđe and Potkonjak, Nebojša I. and Miljanić, Šćepan S.",
year = "2006",
abstract = "Hydrogen is one of the most widely produced commodities in the world economy. The basic technologies for producing hydrogen via the electrolysis of water have long been known. However, there are disadvantages when using this process. Two-thirds of the operation costs of the electrolyzers are electricity costs. The challenge, addressed.by numerous companies and researchers in the last few years, is the cost cutting by increasing efficiency of the process. The aim of this work was the attempt to optimize the electrolytic hydrogen production from alkaline solution, through the variation of cathode materials and use of ionic activators. The part of our results shows the better electrocatalytic activity of intermetallic phases and the energy consumption is decreased when compared with the industrial data (4.5-5 kWh m(-3) H-2). The role of ionic activator used is also very significant. These results give the opportunity for further research of cumulative effect of the intermetallic electrodes and ionic activators on industrial level. (c) 2005 Elsevier B.V. All rights reserved.",
journal = "Journal of Power Sources",
title = "Comparison of different electrode materials - Energy requirements in the electrolytic hydrogen evolution process",
volume = "157",
number = "2",
pages = "758-764",
doi = "10.1016/j.jpowsour.2005.10.105"
}

Marčeta Kaninski, M., Stojić, D. Lj., Šaponjić, Đ., Potkonjak, N. I.,& Miljanić, Š. S.. (2006). Comparison of different electrode materials - Energy requirements in the electrolytic hydrogen evolution process. in Journal of Power Sources, 157(2), 758-764.
https://doi.org/10.1016/j.jpowsour.2005.10.105

Marčeta Kaninski M, Stojić DL, Šaponjić Đ, Potkonjak NI, Miljanić ŠS. Comparison of different electrode materials - Energy requirements in the electrolytic hydrogen evolution process. in Journal of Power Sources. 2006;157(2):758-764.
doi:10.1016/j.jpowsour.2005.10.105 .

Marčeta Kaninski, Milica, Stojić, Dragica Lj., Šaponjić, Đorđe, Potkonjak, Nebojša I., Miljanić, Šćepan S., "Comparison of different electrode materials - Energy requirements in the electrolytic hydrogen evolution process" in Journal of Power Sources, 157, no. 2 (2006):758-764,
https://doi.org/10.1016/j.jpowsour.2005.10.105 . .