TY  - JOUR
AU  - Nenadović, Miloš
AU  - Ivanović, Marija
AU  - Kisić, Danilo
AU  - Bundaleski, Nenad
AU  - Pavlović, Vera
AU  - Knežević, Sanja
AU  - Kljajević, Ljiljana
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12727
AB  - In the present paper, polymerization of alkali activated metakaolin (MK) and its structural changing, using 2M NaOH, 8M NaOH, and 16M NaOH solutions were followed by means of X-ray photoelectron spectroscopy (XPS), Diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), Raman spectroscopy and Scanning electron microscopy (SEM). XPS analysis revealed that changing of NaOH concentration did not affect the types of formed bonds in the material. At the same time, the amount of sodium and aluminum increased with the NaOH molarity. The latter steps could be especially interesting because it may indicate the possibility of 'dosing' the amount of Al incorporated by changing the NaOH concentration in the solution. DRIFT analysis revealed that the absorption band for AlIV located at 800 cm-1 is shifted towards the smaller values. Changing the concentration of NaOH, the chemical content did not change, but the structural changes are observed. Raman spectroscopy detected that the most dominant peaks at ∼400 cm-1 and 519 cm-1 originate from Si-O-Al and Si-O-Si bending modes. With increasing the NaOH concentration, peaks at 1019-1060 cm-1 become more prominent as a result of polymerization. Both analyzes (DRIFT and Raman) confirmed the presence of quartz. SEM analysis showed that different structures are created by changing the concentration of NaOH.
AB  - У овом раду, праћена је полимеризација алкално активираног метакаолина (МК) и његове структурне промене, коришћењем 2М NaOH, 8М NaOH и 16М раствора NaOH. Промене су праћене рендгенском фотоелектронском спектроскопијом (XPS), дифузном рефлексијом инфрацрвене Фуријеове трансформације (DRIFT), Рамановом спектроскопијом и скенирајућом електронском микроскопијом (SEM). XPS анализа је показала да промена концентрације NaOH није утицала на типове формираних веза у материјалу. Истовремено, количина натријума и алуминијума се повећавала са моларношћу NaOH. Последњи кораци могу бити посебно интересантни јер могу указивати на могућност 'дозирања' количине Al инкорпорираног променом концентрације NaOH у раствору. DRIFT анализа је открила да је опсег апсорпције за AlIV који се налази на 800 cm-1 померен ка мањим вредностима. Променом концентрације NaOH, хемијски садржај се није мењао, али су уочене структурне промене. Раманова спектроскопија је открила да најдоминантнији пикови на 400 cm-1 и 519 cm-1 потичу из Si-О-Al и Si-О-Si начина савијања хемијских веза. Са повећањем концентрације NaOH, пикови на 1019-1060 cm-1 постају све израженији као резултат полимеризације. Обе анализе (DRIFT и Раман) потврдиле су присуство кварца. SEM анализа је показала да се променом концентрације NaOH стварају различите структуре.
T2  - Science of Sintering
T1  - Changes in the physicochemical properties of geopolymer gels as a function of NaOH concentration
VL  - 55
IS  - 4
SP  - 509
EP  - 519
DO  - 10.2298/SOS220624020N
ER  - 

@article{
author = "Nenadović, Miloš and Ivanović, Marija and Kisić, Danilo and Bundaleski, Nenad and Pavlović, Vera and Knežević, Sanja and Kljajević, Ljiljana",
year = "2024",
abstract = "In the present paper, polymerization of alkali activated metakaolin (MK) and its structural changing, using 2M NaOH, 8M NaOH, and 16M NaOH solutions were followed by means of X-ray photoelectron spectroscopy (XPS), Diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), Raman spectroscopy and Scanning electron microscopy (SEM). XPS analysis revealed that changing of NaOH concentration did not affect the types of formed bonds in the material. At the same time, the amount of sodium and aluminum increased with the NaOH molarity. The latter steps could be especially interesting because it may indicate the possibility of 'dosing' the amount of Al incorporated by changing the NaOH concentration in the solution. DRIFT analysis revealed that the absorption band for AlIV located at 800 cm-1 is shifted towards the smaller values. Changing the concentration of NaOH, the chemical content did not change, but the structural changes are observed. Raman spectroscopy detected that the most dominant peaks at ∼400 cm-1 and 519 cm-1 originate from Si-O-Al and Si-O-Si bending modes. With increasing the NaOH concentration, peaks at 1019-1060 cm-1 become more prominent as a result of polymerization. Both analyzes (DRIFT and Raman) confirmed the presence of quartz. SEM analysis showed that different structures are created by changing the concentration of NaOH., У овом раду, праћена је полимеризација алкално активираног метакаолина (МК) и његове структурне промене, коришћењем 2М NaOH, 8М NaOH и 16М раствора NaOH. Промене су праћене рендгенском фотоелектронском спектроскопијом (XPS), дифузном рефлексијом инфрацрвене Фуријеове трансформације (DRIFT), Рамановом спектроскопијом и скенирајућом електронском микроскопијом (SEM). XPS анализа је показала да промена концентрације NaOH није утицала на типове формираних веза у материјалу. Истовремено, количина натријума и алуминијума се повећавала са моларношћу NaOH. Последњи кораци могу бити посебно интересантни јер могу указивати на могућност 'дозирања' количине Al инкорпорираног променом концентрације NaOH у раствору. DRIFT анализа је открила да је опсег апсорпције за AlIV који се налази на 800 cm-1 померен ка мањим вредностима. Променом концентрације NaOH, хемијски садржај се није мењао, али су уочене структурне промене. Раманова спектроскопија је открила да најдоминантнији пикови на 400 cm-1 и 519 cm-1 потичу из Si-О-Al и Si-О-Si начина савијања хемијских веза. Са повећањем концентрације NaOH, пикови на 1019-1060 cm-1 постају све израженији као резултат полимеризације. Обе анализе (DRIFT и Раман) потврдиле су присуство кварца. SEM анализа је показала да се променом концентрације NaOH стварају различите структуре.",
journal = "Science of Sintering",
title = "Changes in the physicochemical properties of geopolymer gels as a function of NaOH concentration",
volume = "55",
number = "4",
pages = "509-519",
doi = "10.2298/SOS220624020N"
}

Nenadović, M., Ivanović, M., Kisić, D., Bundaleski, N., Pavlović, V., Knežević, S.,& Kljajević, L.. (2024). Changes in the physicochemical properties of geopolymer gels as a function of NaOH concentration. in Science of Sintering, 55(4), 509-519.
https://doi.org/10.2298/SOS220624020N

Nenadović M, Ivanović M, Kisić D, Bundaleski N, Pavlović V, Knežević S, Kljajević L. Changes in the physicochemical properties of geopolymer gels as a function of NaOH concentration. in Science of Sintering. 2024;55(4):509-519.
doi:10.2298/SOS220624020N .

Nenadović, Miloš, Ivanović, Marija, Kisić, Danilo, Bundaleski, Nenad, Pavlović, Vera, Knežević, Sanja, Kljajević, Ljiljana, "Changes in the physicochemical properties of geopolymer gels as a function of NaOH concentration" in Science of Sintering, 55, no. 4 (2024):509-519,
https://doi.org/10.2298/SOS220624020N . .

TY  - CONF
AU  - Knežević, Sanja
AU  - Nenadović, Miloš
AU  - Potočnik, Jelena
AU  - Kisić, Danilo
AU  - Rajačić, Milica
AU  - Nenadović, Snežana
AU  - Ivanović, Marija
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12326
AB  - This study focused on analyzing samples of aluminosilicate materials in which different percentages of samarium (III)-oxide were incorporated. Basic samples and thermally treated samples at 600 °C were analyzed. Introducing samarium (III)-oxide into the polymer matrix of aluminosilicates has been demonstrated to alter the fundamental structure of aluminosilicate materials. Interestingly, at elevated temperatures, these materials exhibit even more distinctive properties. The gamma ray spectrometric analysis results were used to conduct radiological analysis. Different methods monitor physico-chemical changes within the aluminosilicate materials. By introducing Sm3+ into the aluminosilicate matrix, the basic structure of the aluminosilicate is disturbed. The DRIFT method was used to analyze the structural properties. The analysis of the microstructural properties of the selected samples was carried out using a scanning electron microscope (SEM) and enabled the examination of the fine details of the structure of the materials thermally treated at 600 °C which resulted in the appearance of significant pores and cracks in the material.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - Radiological and structural analysis of aluminosilicate materials incorporated with samarium (III)-oxide
SP  - 55
EP  - 55
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12326
ER  - 

@conference{
author = "Knežević, Sanja and Nenadović, Miloš and Potočnik, Jelena and Kisić, Danilo and Rajačić, Milica and Nenadović, Snežana and Ivanović, Marija",
year = "2023",
abstract = "This study focused on analyzing samples of aluminosilicate materials in which different percentages of samarium (III)-oxide were incorporated. Basic samples and thermally treated samples at 600 °C were analyzed. Introducing samarium (III)-oxide into the polymer matrix of aluminosilicates has been demonstrated to alter the fundamental structure of aluminosilicate materials. Interestingly, at elevated temperatures, these materials exhibit even more distinctive properties. The gamma ray spectrometric analysis results were used to conduct radiological analysis. Different methods monitor physico-chemical changes within the aluminosilicate materials. By introducing Sm3+ into the aluminosilicate matrix, the basic structure of the aluminosilicate is disturbed. The DRIFT method was used to analyze the structural properties. The analysis of the microstructural properties of the selected samples was carried out using a scanning electron microscope (SEM) and enabled the examination of the fine details of the structure of the materials thermally treated at 600 °C which resulted in the appearance of significant pores and cracks in the material.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "Radiological and structural analysis of aluminosilicate materials incorporated with samarium (III)-oxide",
pages = "55-55",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12326"
}

Knežević, S., Nenadović, M., Potočnik, J., Kisić, D., Rajačić, M., Nenadović, S.,& Ivanović, M.. (2023). Radiological and structural analysis of aluminosilicate materials incorporated with samarium (III)-oxide. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 55-55.
https://hdl.handle.net/21.15107/rcub_vinar_12326

Knežević S, Nenadović M, Potočnik J, Kisić D, Rajačić M, Nenadović S, Ivanović M. Radiological and structural analysis of aluminosilicate materials incorporated with samarium (III)-oxide. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2023;:55-55.
https://hdl.handle.net/21.15107/rcub_vinar_12326 .

Knežević, Sanja, Nenadović, Miloš, Potočnik, Jelena, Kisić, Danilo, Rajačić, Milica, Nenadović, Snežana, Ivanović, Marija, "Radiological and structural analysis of aluminosilicate materials incorporated with samarium (III)-oxide" in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2023):55-55,
https://hdl.handle.net/21.15107/rcub_vinar_12326 .

TY  - JOUR
AU  - Knežević, Sanja
AU  - Ivanović, Marija
AU  - Stanković, Dalibor M.
AU  - Kisić, Danilo
AU  - Nenadović, Snežana
AU  - Potočnik, Jelena
AU  - Nenadović, Miloš
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11074
AB  - The following investigation presents the thermal treatment of geopolymer at 300 °C, 600 °C and 900 °C. We investigated what happens to the geopolymer base when incorporated with 1% and 5% of neodymium in the form Nd2O3. A total of six samples were synthesized. Geopolymer 1 contained 1% and geopolymer 2 contained 5% Nd2O3, and these samples were treated at 300 °C; then, samples geopolymer 3 and geopolymer 4 also had the same percentage composition of Nd2O3 and were treated at 600 °C, while samples geopolymer 5 and geopolymer 6were treated at 900 °C. Physical and chemical changes in the aluminosilicate geopolymer matrix were monitored. The incorporation of rare earths into the polymer network of aluminosilicates has been proven to disrupt the basic structure of geopolymers; however, with increased temperatures, these materials show even more unusual properties. Diffuse reflectance infrared Fourier transform (DRIFT) analysis showed that the intensity of the vibrational band decreases with the increase in temperature during thermal treatment, suggesting alterations in the chemical structure of the geopolymers. Transmission electron microscopy (TEM) analysis showed that the diameter of the nanoparticles containing Al2O3 is in the range 5–10 nm, while larger crystallites range from 30 to 80 nm. Scanning electron microscopy (SEM) analysis revealed that the temperature of the thermal treatment increases to 300 °C and 600 °C; the porosity of geopolymer increases in the form of the appearance of large pores and cracks in material. X-ray photoelectron spectroscopy (XPS) analysis was used to investigate the surface chemistry of geopolymers, including the chemical composition of the surface, the oxidation state of the elements, and the presence of functional groups. The UV/Vis spectra of the synthesized geopolymers doped with Nd3+ show interesting optical properties at 900 °C; the geopolymer matrix completely disintegrates and an amorphous phase with a rare-earth precipitate appears.
T2  - Nanomaterials
T1  - Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium
VL  - 13
IS  - 10
SP  - 1663
DO  - 10.3390/nano13101663
ER  - 

@article{
author = "Knežević, Sanja and Ivanović, Marija and Stanković, Dalibor M. and Kisić, Danilo and Nenadović, Snežana and Potočnik, Jelena and Nenadović, Miloš",
year = "2023",
abstract = "The following investigation presents the thermal treatment of geopolymer at 300 °C, 600 °C and 900 °C. We investigated what happens to the geopolymer base when incorporated with 1% and 5% of neodymium in the form Nd2O3. A total of six samples were synthesized. Geopolymer 1 contained 1% and geopolymer 2 contained 5% Nd2O3, and these samples were treated at 300 °C; then, samples geopolymer 3 and geopolymer 4 also had the same percentage composition of Nd2O3 and were treated at 600 °C, while samples geopolymer 5 and geopolymer 6were treated at 900 °C. Physical and chemical changes in the aluminosilicate geopolymer matrix were monitored. The incorporation of rare earths into the polymer network of aluminosilicates has been proven to disrupt the basic structure of geopolymers; however, with increased temperatures, these materials show even more unusual properties. Diffuse reflectance infrared Fourier transform (DRIFT) analysis showed that the intensity of the vibrational band decreases with the increase in temperature during thermal treatment, suggesting alterations in the chemical structure of the geopolymers. Transmission electron microscopy (TEM) analysis showed that the diameter of the nanoparticles containing Al2O3 is in the range 5–10 nm, while larger crystallites range from 30 to 80 nm. Scanning electron microscopy (SEM) analysis revealed that the temperature of the thermal treatment increases to 300 °C and 600 °C; the porosity of geopolymer increases in the form of the appearance of large pores and cracks in material. X-ray photoelectron spectroscopy (XPS) analysis was used to investigate the surface chemistry of geopolymers, including the chemical composition of the surface, the oxidation state of the elements, and the presence of functional groups. The UV/Vis spectra of the synthesized geopolymers doped with Nd3+ show interesting optical properties at 900 °C; the geopolymer matrix completely disintegrates and an amorphous phase with a rare-earth precipitate appears.",
journal = "Nanomaterials",
title = "Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium",
volume = "13",
number = "10",
pages = "1663",
doi = "10.3390/nano13101663"
}

Knežević, S., Ivanović, M., Stanković, D. M., Kisić, D., Nenadović, S., Potočnik, J.,& Nenadović, M.. (2023). Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium. in Nanomaterials, 13(10), 1663.
https://doi.org/10.3390/nano13101663

Knežević S, Ivanović M, Stanković DM, Kisić D, Nenadović S, Potočnik J, Nenadović M. Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium. in Nanomaterials. 2023;13(10):1663.
doi:10.3390/nano13101663 .

Knežević, Sanja, Ivanović, Marija, Stanković, Dalibor M., Kisić, Danilo, Nenadović, Snežana, Potočnik, Jelena, Nenadović, Miloš, "Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium" in Nanomaterials, 13, no. 10 (2023):1663,
https://doi.org/10.3390/nano13101663 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Stanisavljević Ninković, Danijela
AU  - Kisić, Danilo
AU  - Stevanović, Milena J.
AU  - Stratakis, Emmanuel
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11368
AB  - Arranged patterns obtained via ultrafast laser processing on the surface of Ti/Cu/Ti/Si and Ti/Zr/Ti/Si thin-film systems are reported. Two differently designed multilayer thin films Ti/Cu/Ti/Si and Ti/Zr/Ti/Si were deposited on silicon using the ion sputtering method. The bioactive surfaces of these systems involve the formation of laser-induced periodic surface structures (LIPSS) in each of the laser-written lines of mesh patterns on 5 × 5 mm areas. The formation of nano- and micro-patterns with an ultra-thin oxide film on the surfaces was used to observe the effects of morphology and proliferation of the MRC-5 cell culture line. To determine whether Ti-based thin films have a toxic effect on living cells, an MTT assay was performed. The relative cytotoxic effect, as a percentage of surviving cells, showed that there was no difference in cell number between the Ti-based thin films and the control cells. There was also no difference in the viability of the MRC-5 cells, except for the Ti/Cu/Ti/Si system, where there was a slight 10% decrease in cell viability. © 2023 by the authors.
T2  - Coatings
T1  - Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems
VL  - 13
IS  - 6
SP  - 1107
DO  - 10.3390/coatings13061107
ER  - 

@article{
author = "Petrović, Suzana and Božinović, Nevena and Rajić, Vladimir and Stanisavljević Ninković, Danijela and Kisić, Danilo and Stevanović, Milena J. and Stratakis, Emmanuel",
year = "2023",
abstract = "Arranged patterns obtained via ultrafast laser processing on the surface of Ti/Cu/Ti/Si and Ti/Zr/Ti/Si thin-film systems are reported. Two differently designed multilayer thin films Ti/Cu/Ti/Si and Ti/Zr/Ti/Si were deposited on silicon using the ion sputtering method. The bioactive surfaces of these systems involve the formation of laser-induced periodic surface structures (LIPSS) in each of the laser-written lines of mesh patterns on 5 × 5 mm areas. The formation of nano- and micro-patterns with an ultra-thin oxide film on the surfaces was used to observe the effects of morphology and proliferation of the MRC-5 cell culture line. To determine whether Ti-based thin films have a toxic effect on living cells, an MTT assay was performed. The relative cytotoxic effect, as a percentage of surviving cells, showed that there was no difference in cell number between the Ti-based thin films and the control cells. There was also no difference in the viability of the MRC-5 cells, except for the Ti/Cu/Ti/Si system, where there was a slight 10% decrease in cell viability. © 2023 by the authors.",
journal = "Coatings",
title = "Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems",
volume = "13",
number = "6",
pages = "1107",
doi = "10.3390/coatings13061107"
}

Petrović, S., Božinović, N., Rajić, V., Stanisavljević Ninković, D., Kisić, D., Stevanović, M. J.,& Stratakis, E.. (2023). Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems. in Coatings, 13(6), 1107.
https://doi.org/10.3390/coatings13061107

Petrović S, Božinović N, Rajić V, Stanisavljević Ninković D, Kisić D, Stevanović MJ, Stratakis E. Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems. in Coatings. 2023;13(6):1107.
doi:10.3390/coatings13061107 .

Petrović, Suzana, Božinović, Nevena, Rajić, Vladimir, Stanisavljević Ninković, Danijela, Kisić, Danilo, Stevanović, Milena J., Stratakis, Emmanuel, "Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems" in Coatings, 13, no. 6 (2023):1107,
https://doi.org/10.3390/coatings13061107 . .

TY  - CONF
AU  - Knežević, Sanja
AU  - Ivanović, Marija
AU  - Kisić, Danilo
AU  - Nenadović, Snežana
AU  - Potočnik, Jelena
AU  - Nenadović, Miloš
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11748
AB  - The following investigation presents the thermal treatment of geopolymer based on metakaolin, with the addition of 1% and 5% of neodymium in the form Nd2O3, at 300˚C, 600˚C and 900˚C. Six samples were synthesized in total. Samples GT1 and GT2 containing 1% and 5% of Nd2O3, and they were treated at 300˚C, while the samples GT3 and GT4 also had the same percentage composition of Nd2O3 and were treated at 600˚C, and the samples GT5 and GT6 were treated at 900˚C with the same percentage of Nd2O3. Physical and chemical changes in the aluminosilicate geopolymer matrix were monitored. The incorporation of rare earths into the polymer network of aluminosilicates has been proven to disrupt the basic structure of geopolymers, however, with increased temperature, these materials show even more unusual properties. DRIFT was employed to investigate the structural properties of thermally treated geopolymers. Additionally, TEM provided further insight into the structural changes induced by thermal treatment and Nd2O3 doping. SEM was used to observe the effect of thermal treatment temperature (300˚C and 600˚C) on geopolymer porosity, which resulted in the appearance of large pores and cracks in the material. The UV/Vis spectra of the synthesized Nd3+ doped geopolymers exhibited attractive optical properties. The photoexcitation of electrons from the valence band to the conduction band in the geopolymer structure is responsible for the absorbance observed at 260 nm, while the minor peaks at slightly longer wavelengths can be linked to Nd3+
PB  - Society of Chemists and Technologists of Macedonia
C3  - 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia
T1  - Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium
SP  - 20
EP  - 20
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11748
ER  - 

@conference{
author = "Knežević, Sanja and Ivanović, Marija and Kisić, Danilo and Nenadović, Snežana and Potočnik, Jelena and Nenadović, Miloš",
year = "2023",
abstract = "The following investigation presents the thermal treatment of geopolymer based on metakaolin, with the addition of 1% and 5% of neodymium in the form Nd2O3, at 300˚C, 600˚C and 900˚C. Six samples were synthesized in total. Samples GT1 and GT2 containing 1% and 5% of Nd2O3, and they were treated at 300˚C, while the samples GT3 and GT4 also had the same percentage composition of Nd2O3 and were treated at 600˚C, and the samples GT5 and GT6 were treated at 900˚C with the same percentage of Nd2O3. Physical and chemical changes in the aluminosilicate geopolymer matrix were monitored. The incorporation of rare earths into the polymer network of aluminosilicates has been proven to disrupt the basic structure of geopolymers, however, with increased temperature, these materials show even more unusual properties. DRIFT was employed to investigate the structural properties of thermally treated geopolymers. Additionally, TEM provided further insight into the structural changes induced by thermal treatment and Nd2O3 doping. SEM was used to observe the effect of thermal treatment temperature (300˚C and 600˚C) on geopolymer porosity, which resulted in the appearance of large pores and cracks in the material. The UV/Vis spectra of the synthesized Nd3+ doped geopolymers exhibited attractive optical properties. The photoexcitation of electrons from the valence band to the conduction band in the geopolymer structure is responsible for the absorbance observed at 260 nm, while the minor peaks at slightly longer wavelengths can be linked to Nd3+",
publisher = "Society of Chemists and Technologists of Macedonia",
journal = "26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia",
title = "Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium",
pages = "20-20",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11748"
}

Knežević, S., Ivanović, M., Kisić, D., Nenadović, S., Potočnik, J.,& Nenadović, M.. (2023). Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium. in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia
Society of Chemists and Technologists of Macedonia., 20-20.
https://hdl.handle.net/21.15107/rcub_vinar_11748

Knežević S, Ivanović M, Kisić D, Nenadović S, Potočnik J, Nenadović M. Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium. in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia. 2023;:20-20.
https://hdl.handle.net/21.15107/rcub_vinar_11748 .

Knežević, Sanja, Ivanović, Marija, Kisić, Danilo, Nenadović, Snežana, Potočnik, Jelena, Nenadović, Miloš, "Microstructural Analysis of Thermally Treated Geopolymer Incorporated with Neodymium" in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia (2023):20-20,
https://hdl.handle.net/21.15107/rcub_vinar_11748 .

TY  - CONF
AU  - Nenadović, Miloš
AU  - Kisić, Danilo
AU  - Ivanović, Marija M.
AU  - Knežević, Sanja
AU  - Nenadović, Snežana
AU  - Kljajević, Ljiljana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11749
AB  - The aim of this study was determination of physical-chemical, radiological and structural characteristics of kaolin, fly ash and the products of alkali-activated as well as thermally treated kaolin (alkali activated materials). Kaolin (raw material) and fly ash (industrial waste) used in the investigation showed the great potential for obtaining alkali activated materials as relatively new products to be used in construction and civil engineering as green cements. Physical-chemical and structural characterization was conducted using X ray diffraction (XRD), Fourier transform infra-red (FTIR) and X ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM) and High-resolution transmission electron microscopy (HR-TEM). Activity concentration of naturally occurring radionuclides in kaolin, metakaolin, fly ash and alkali activated materials were determined. The absorbed dose rate (D) and the annual effective dose rate (EDR), were calculated in accordance to the UNSCEAR 2000 report. Kaolin was thermally treated on 750°C, and specific activity of natural radionuclides in metakaolin increased up to 1.6, while specific activities in alkali activated materials were significantly reduced.
PB  - Society of Chemists and Technologists of Macedonia
C3  - 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia
T1  - Physicochemical, Radiological and Structural Properties of Alkali Activated Materials – Future Trends and Applications
SP  - 21
EP  - 21
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11749
ER  - 

@conference{
author = "Nenadović, Miloš and Kisić, Danilo and Ivanović, Marija M. and Knežević, Sanja and Nenadović, Snežana and Kljajević, Ljiljana",
year = "2023",
abstract = "The aim of this study was determination of physical-chemical, radiological and structural characteristics of kaolin, fly ash and the products of alkali-activated as well as thermally treated kaolin (alkali activated materials). Kaolin (raw material) and fly ash (industrial waste) used in the investigation showed the great potential for obtaining alkali activated materials as relatively new products to be used in construction and civil engineering as green cements. Physical-chemical and structural characterization was conducted using X ray diffraction (XRD), Fourier transform infra-red (FTIR) and X ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM) and High-resolution transmission electron microscopy (HR-TEM). Activity concentration of naturally occurring radionuclides in kaolin, metakaolin, fly ash and alkali activated materials were determined. The absorbed dose rate (D) and the annual effective dose rate (EDR), were calculated in accordance to the UNSCEAR 2000 report. Kaolin was thermally treated on 750°C, and specific activity of natural radionuclides in metakaolin increased up to 1.6, while specific activities in alkali activated materials were significantly reduced.",
publisher = "Society of Chemists and Technologists of Macedonia",
journal = "26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia",
title = "Physicochemical, Radiological and Structural Properties of Alkali Activated Materials – Future Trends and Applications",
pages = "21-21",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11749"
}

Nenadović, M., Kisić, D., Ivanović, M. M., Knežević, S., Nenadović, S.,& Kljajević, L.. (2023). Physicochemical, Radiological and Structural Properties of Alkali Activated Materials – Future Trends and Applications. in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia
Society of Chemists and Technologists of Macedonia., 21-21.
https://hdl.handle.net/21.15107/rcub_vinar_11749

Nenadović M, Kisić D, Ivanović MM, Knežević S, Nenadović S, Kljajević L. Physicochemical, Radiological and Structural Properties of Alkali Activated Materials – Future Trends and Applications. in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia. 2023;:21-21.
https://hdl.handle.net/21.15107/rcub_vinar_11749 .

Nenadović, Miloš, Kisić, Danilo, Ivanović, Marija M., Knežević, Sanja, Nenadović, Snežana, Kljajević, Ljiljana, "Physicochemical, Radiological and Structural Properties of Alkali Activated Materials – Future Trends and Applications" in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia (2023):21-21,
https://hdl.handle.net/21.15107/rcub_vinar_11749 .

TY  - JOUR
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Kisić, Danilo
AU  - Milovanović, Dubravka S.
AU  - Savović, Jelena
AU  - Petrović, Suzana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10371
AB  - In this study, the design of surface pattering with the co-existence of micrometer and nanometer features was carried out to improve the arrayed surface structures on Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayer thin films by picosecond laser processing. The novel composite structure consisted of two layers of Ti and subsurface distributed Cu and Zr layers (thickness of 10 nm) were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The changes in the composition, surface morphology, and wetting properties after laser modification was monitored by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM–EDS), optical profilometry, and wettability measurements. It was found that laser irradiation can induce the melting of material with the formation of wrinkled periodic structures at the edges of the laser spots in both systems as a consequence of the hydrodynamic effects. Another interesting result was that the periodic structure in form of LSFL (low spatial frequency LIPSS) ripples was numerous but slightly pronounced in Ti/Cu/Zr/Ti, due to the presence of the Zr component as an ultra-thin subsurface layer, which most likely favored creating LIPSS. Such laser texturing has been used in the biomedical field as a method of developing surface topography, coated with oxides to potentially improve cell response via suitable surface wetting for a biological system.
T2  - Optical and Quantum Electronics
T1  - Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films
VL  - 54
IS  - 9
SP  - 561
DO  - 10.1007/s11082-022-03910-6
ER  - 

@article{
author = "Božinović, Nevena and Rajić, Vladimir and Kisić, Danilo and Milovanović, Dubravka S. and Savović, Jelena and Petrović, Suzana",
year = "2022",
abstract = "In this study, the design of surface pattering with the co-existence of micrometer and nanometer features was carried out to improve the arrayed surface structures on Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayer thin films by picosecond laser processing. The novel composite structure consisted of two layers of Ti and subsurface distributed Cu and Zr layers (thickness of 10 nm) were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The changes in the composition, surface morphology, and wetting properties after laser modification was monitored by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM–EDS), optical profilometry, and wettability measurements. It was found that laser irradiation can induce the melting of material with the formation of wrinkled periodic structures at the edges of the laser spots in both systems as a consequence of the hydrodynamic effects. Another interesting result was that the periodic structure in form of LSFL (low spatial frequency LIPSS) ripples was numerous but slightly pronounced in Ti/Cu/Zr/Ti, due to the presence of the Zr component as an ultra-thin subsurface layer, which most likely favored creating LIPSS. Such laser texturing has been used in the biomedical field as a method of developing surface topography, coated with oxides to potentially improve cell response via suitable surface wetting for a biological system.",
journal = "Optical and Quantum Electronics",
title = "Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films",
volume = "54",
number = "9",
pages = "561",
doi = "10.1007/s11082-022-03910-6"
}

Božinović, N., Rajić, V., Kisić, D., Milovanović, D. S., Savović, J.,& Petrović, S.. (2022). Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films. in Optical and Quantum Electronics, 54(9), 561.
https://doi.org/10.1007/s11082-022-03910-6

Božinović N, Rajić V, Kisić D, Milovanović DS, Savović J, Petrović S. Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films. in Optical and Quantum Electronics. 2022;54(9):561.
doi:10.1007/s11082-022-03910-6 .

Božinović, Nevena, Rajić, Vladimir, Kisić, Danilo, Milovanović, Dubravka S., Savović, Jelena, Petrović, Suzana, "Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films" in Optical and Quantum Electronics, 54, no. 9 (2022):561,
https://doi.org/10.1007/s11082-022-03910-6 . .

TY  - JOUR
AU  - Nenadović, Miloš
AU  - Kisić, Danilo
AU  - Mirković, Miljana M.
AU  - Nenadović, Snežana S.
AU  - Kljajević, Ljiljana M.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9877
AB  - The implantation of high-density polyethylene (HDPE) has been conducted using Ag+ ions with energy of 60 keV, achieved fluences 1.5 and 10•1015 ions/cm2. Transmission electron microscopy (STEM) and field emission gun - scanning electron microscopy (FEG-SEM) showed the existence of nanoparticle clusters. X ray photoelectron spectroscopy (XPS) revealed the presence of silver in the sample surface region. The surface topography was studied by atomic force microscopy (AFM), while the surface composition uniformity was analyzed using phase imaging AFM. Optical characterization obtained by spectroscopic ellipsometry (SE) showed changes in refractive index, extinction coefficient and the optical band gap with the fluence of implanted ions.
T2  - Science of Sintering
T1  - Structural and optical properties of HDPE implanted with medium fluences silver ions
VL  - 53
IS  - 2
SP  - 187
EP  - 198
DO  - 10.2298/SOS2102187N
ER  - 

@article{
author = "Nenadović, Miloš and Kisić, Danilo and Mirković, Miljana M. and Nenadović, Snežana S. and Kljajević, Ljiljana M.",
year = "2021",
abstract = "The implantation of high-density polyethylene (HDPE) has been conducted using Ag+ ions with energy of 60 keV, achieved fluences 1.5 and 10•1015 ions/cm2. Transmission electron microscopy (STEM) and field emission gun - scanning electron microscopy (FEG-SEM) showed the existence of nanoparticle clusters. X ray photoelectron spectroscopy (XPS) revealed the presence of silver in the sample surface region. The surface topography was studied by atomic force microscopy (AFM), while the surface composition uniformity was analyzed using phase imaging AFM. Optical characterization obtained by spectroscopic ellipsometry (SE) showed changes in refractive index, extinction coefficient and the optical band gap with the fluence of implanted ions.",
journal = "Science of Sintering",
title = "Structural and optical properties of HDPE implanted with medium fluences silver ions",
volume = "53",
number = "2",
pages = "187-198",
doi = "10.2298/SOS2102187N"
}

Nenadović, M., Kisić, D., Mirković, M. M., Nenadović, S. S.,& Kljajević, L. M.. (2021). Structural and optical properties of HDPE implanted with medium fluences silver ions. in Science of Sintering, 53(2), 187-198.
https://doi.org/10.2298/SOS2102187N

Nenadović M, Kisić D, Mirković MM, Nenadović SS, Kljajević LM. Structural and optical properties of HDPE implanted with medium fluences silver ions. in Science of Sintering. 2021;53(2):187-198.
doi:10.2298/SOS2102187N .

Nenadović, Miloš, Kisić, Danilo, Mirković, Miljana M., Nenadović, Snežana S., Kljajević, Ljiljana M., "Structural and optical properties of HDPE implanted with medium fluences silver ions" in Science of Sintering, 53, no. 2 (2021):187-198,
https://doi.org/10.2298/SOS2102187N . .

TY  - CONF
AU  - Kisić, Danilo
AU  - Nenadović, Miloš
AU  - Novaković, Mirjana M.
AU  - Potočnik, Jelena
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10896
AB  - In this study, iron-polyethylene nanocomposites were synthesized, by ion implantation with different fluences, in the range from 5 × 1016 ions/cm2 to 5×1017 ions/cm2 , and at the energy of 95 keV. Rutherford backscattering spectroscopy confirmed the presence of iron in the implanted samples, and the calculated fluences matched with those predicted, except for the highest implantation fluence, where a significant difference was due to the sputtering effect. It was also found that the depth of damage was slightly lower than predicted by the SRIM simulation [1]. X-ray photoelectron spectroscopy has revealed that implanted iron is in the form of pure metallic iron - Fe (0), and multiple iron oxides. On the other hand, carbon was mostly transformed from a sp3 hybridized, to a sp2 hybridized, indicating that the carbonization of polyethylene and the degassing of hydrogen took place. Infrared spectroscopy has indicated that aldehydes and ketones are formed after implantation, and that many organic compounds are likely to form upon implantation with the highest fluence. Atomic force microscopy confirmed that implantation led to considerable destruction of the surface, resulting in changes of surface morphology, and a considerable increase of surface roughness [2]. Transmission electron microscopy microphotographs show that after implantation, iron nanoparticles are formed, and the particle sizes have a characteristic depth distribution, according to which they can be classified into three zones. However, a continuous layer is formed in the case of the highest implantation fluence. Energy dispersive spectrophotometric analysis of a single particle indicated that the nanoparticle interior was mainly composed of pure metallic iron, and that the iron oxides probably dominated near the very surface of the nanoparticles [1]. From the measurements of the sheet resistivity by the 4-point contact probe method, it was observed that between the 1×1017 ions/cm2 and 2×1017 ions/cm2 fluences, a transition occurs in which the metal phase takes a dominant role in the mechanism of electric conduction and that percolation most likely is achieved for fluences in the range between 2×1017 ions/cm2 and 5 × 1017 ions/cm2 [2]. Measurements by Kerr magneto-optical magnetometry have indicated that the magnetic properties change in accordance with the applied implantation fluence and the morphology of the iron nanoparticles formed in the surface layer. The occurrence of the ferromagnetic phase can be observed for the two higher fluences, with a coercivity of only 20 Oe for the fluence of 2×1017 ions/cm2 , whereas for the highest fluence of 5×1017 ions/cm2 , the coercivity is 57 Oe. The shape of hysteresis loop is typical of a mixture of single and multi-domain particles. UV-VIS spectroscopy showed that, as a consequence of implantation, the peaks in the Kubelka - Munk spectra of remission function appear [1], most likely originating from localized surface plasmon resonance of the iron nanoparticles [3,4]. Surface energy changes with the implantation fluence, in a way that it increases up to a fluence of 1 × 1017 ions/cm2 , and then decreases with increasing fluence. It was also found that the hydrophobic, i.e. dispersive character of the surface does not change significantly as a consequence of implantation [2].
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - The Influence of Ion Implantation of Iron on the Surface Properties of High Density Polyethylene
SP  - 43
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10896
ER  - 

@conference{
author = "Kisić, Danilo and Nenadović, Miloš and Novaković, Mirjana M. and Potočnik, Jelena",
year = "2021",
abstract = "In this study, iron-polyethylene nanocomposites were synthesized, by ion implantation with different fluences, in the range from 5 × 1016 ions/cm2 to 5×1017 ions/cm2 , and at the energy of 95 keV. Rutherford backscattering spectroscopy confirmed the presence of iron in the implanted samples, and the calculated fluences matched with those predicted, except for the highest implantation fluence, where a significant difference was due to the sputtering effect. It was also found that the depth of damage was slightly lower than predicted by the SRIM simulation [1]. X-ray photoelectron spectroscopy has revealed that implanted iron is in the form of pure metallic iron - Fe (0), and multiple iron oxides. On the other hand, carbon was mostly transformed from a sp3 hybridized, to a sp2 hybridized, indicating that the carbonization of polyethylene and the degassing of hydrogen took place. Infrared spectroscopy has indicated that aldehydes and ketones are formed after implantation, and that many organic compounds are likely to form upon implantation with the highest fluence. Atomic force microscopy confirmed that implantation led to considerable destruction of the surface, resulting in changes of surface morphology, and a considerable increase of surface roughness [2]. Transmission electron microscopy microphotographs show that after implantation, iron nanoparticles are formed, and the particle sizes have a characteristic depth distribution, according to which they can be classified into three zones. However, a continuous layer is formed in the case of the highest implantation fluence. Energy dispersive spectrophotometric analysis of a single particle indicated that the nanoparticle interior was mainly composed of pure metallic iron, and that the iron oxides probably dominated near the very surface of the nanoparticles [1]. From the measurements of the sheet resistivity by the 4-point contact probe method, it was observed that between the 1×1017 ions/cm2 and 2×1017 ions/cm2 fluences, a transition occurs in which the metal phase takes a dominant role in the mechanism of electric conduction and that percolation most likely is achieved for fluences in the range between 2×1017 ions/cm2 and 5 × 1017 ions/cm2 [2]. Measurements by Kerr magneto-optical magnetometry have indicated that the magnetic properties change in accordance with the applied implantation fluence and the morphology of the iron nanoparticles formed in the surface layer. The occurrence of the ferromagnetic phase can be observed for the two higher fluences, with a coercivity of only 20 Oe for the fluence of 2×1017 ions/cm2 , whereas for the highest fluence of 5×1017 ions/cm2 , the coercivity is 57 Oe. The shape of hysteresis loop is typical of a mixture of single and multi-domain particles. UV-VIS spectroscopy showed that, as a consequence of implantation, the peaks in the Kubelka - Munk spectra of remission function appear [1], most likely originating from localized surface plasmon resonance of the iron nanoparticles [3,4]. Surface energy changes with the implantation fluence, in a way that it increases up to a fluence of 1 × 1017 ions/cm2 , and then decreases with increasing fluence. It was also found that the hydrophobic, i.e. dispersive character of the surface does not change significantly as a consequence of implantation [2].",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "The Influence of Ion Implantation of Iron on the Surface Properties of High Density Polyethylene",
pages = "43",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10896"
}

Kisić, D., Nenadović, M., Novaković, M. M.,& Potočnik, J.. (2021). The Influence of Ion Implantation of Iron on the Surface Properties of High Density Polyethylene. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 43.
https://hdl.handle.net/21.15107/rcub_vinar_10896

Kisić D, Nenadović M, Novaković MM, Potočnik J. The Influence of Ion Implantation of Iron on the Surface Properties of High Density Polyethylene. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:43.
https://hdl.handle.net/21.15107/rcub_vinar_10896 .

Kisić, Danilo, Nenadović, Miloš, Novaković, Mirjana M., Potočnik, Jelena, "The Influence of Ion Implantation of Iron on the Surface Properties of High Density Polyethylene" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):43,
https://hdl.handle.net/21.15107/rcub_vinar_10896 .

TY  - JOUR
AU  - Kisić, Danilo
AU  - Nenadović, Miloš
AU  - Potočnik, Jelena
AU  - Novaković, Mirjana M.
AU  - Noga, Pavol
AU  - Vaňa, Dušan
AU  - Závacká, Anna
AU  - Rakočević, Zlatko Lj.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8587
AB  - Fe/Polyethylene nanocomposite was synthesized by ion beam implantation of 56Fe+ into bulk high-density polyethylene. Nanoscale surface morphology along with magnetic and optical behavior was investigated. The aim of the research was to investigate changes of polyethylene's surface layer morphology with the change of Fe implantation fluence in the high fluence range and to find correlations with the magnetic and optical behavior. Four implantation fluences were applied: 5 × 1016, 1 × 1017, 2 × 1017 and 5 × 1017 cm−2, while the implantation energy was 95 keV. Concentration profiles of implanted Fe were analyzed by Rutherford backscattering spectrometry, showing Fe concentration profile maxima closer to the surface with increasing implantation fluence. Cross-sectional transmission electron microscopy showed the formation of metallic nanoparticles with sizes in a range from below 1 nm up to few tens of nanometers, depending on the fluence, and for the highest implantation fluence, a continuous layer was formed. Magneto-optic Kerr effect magnetometry demonstrates weak ferromagnetic behavior for the 2 higher fluences, and superparamagnetic for the 2 lower fluences. The UV-VIS remission function spectra show the peak in the UV region, which we attribute to iron nanoparticles.
T2  - Vacuum
T1  - Surface layer morphology of the high fluence Fe implanted polyethylene - Correlation with the magnetic and optical behavior
VL  - 171
SP  - 109016
DO  - 10.1016/j.vacuum.2019.109016
ER  - 

@article{
author = "Kisić, Danilo and Nenadović, Miloš and Potočnik, Jelena and Novaković, Mirjana M. and Noga, Pavol and Vaňa, Dušan and Závacká, Anna and Rakočević, Zlatko Lj.",
year = "2020",
abstract = "Fe/Polyethylene nanocomposite was synthesized by ion beam implantation of 56Fe+ into bulk high-density polyethylene. Nanoscale surface morphology along with magnetic and optical behavior was investigated. The aim of the research was to investigate changes of polyethylene's surface layer morphology with the change of Fe implantation fluence in the high fluence range and to find correlations with the magnetic and optical behavior. Four implantation fluences were applied: 5 × 1016, 1 × 1017, 2 × 1017 and 5 × 1017 cm−2, while the implantation energy was 95 keV. Concentration profiles of implanted Fe were analyzed by Rutherford backscattering spectrometry, showing Fe concentration profile maxima closer to the surface with increasing implantation fluence. Cross-sectional transmission electron microscopy showed the formation of metallic nanoparticles with sizes in a range from below 1 nm up to few tens of nanometers, depending on the fluence, and for the highest implantation fluence, a continuous layer was formed. Magneto-optic Kerr effect magnetometry demonstrates weak ferromagnetic behavior for the 2 higher fluences, and superparamagnetic for the 2 lower fluences. The UV-VIS remission function spectra show the peak in the UV region, which we attribute to iron nanoparticles.",
journal = "Vacuum",
title = "Surface layer morphology of the high fluence Fe implanted polyethylene - Correlation with the magnetic and optical behavior",
volume = "171",
pages = "109016",
doi = "10.1016/j.vacuum.2019.109016"
}

Kisić, D., Nenadović, M., Potočnik, J., Novaković, M. M., Noga, P., Vaňa, D., Závacká, A.,& Rakočević, Z. Lj.. (2020). Surface layer morphology of the high fluence Fe implanted polyethylene - Correlation with the magnetic and optical behavior. in Vacuum, 171, 109016.
https://doi.org/10.1016/j.vacuum.2019.109016

Kisić D, Nenadović M, Potočnik J, Novaković MM, Noga P, Vaňa D, Závacká A, Rakočević ZL. Surface layer morphology of the high fluence Fe implanted polyethylene - Correlation with the magnetic and optical behavior. in Vacuum. 2020;171:109016.
doi:10.1016/j.vacuum.2019.109016 .

Kisić, Danilo, Nenadović, Miloš, Potočnik, Jelena, Novaković, Mirjana M., Noga, Pavol, Vaňa, Dušan, Závacká, Anna, Rakočević, Zlatko Lj., "Surface layer morphology of the high fluence Fe implanted polyethylene - Correlation with the magnetic and optical behavior" in Vacuum, 171 (2020):109016,
https://doi.org/10.1016/j.vacuum.2019.109016 . .

TY  - JOUR
AU  - Kisić, Danilo
AU  - Nenadović, Miloš
AU  - Barudžija, Tanja
AU  - Noga, Pavol
AU  - Vaňa, Dušan
AU  - Muška, Martin
AU  - Rakočević, Zlatko Lj.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8646
AB  - In the presented paper, changes of high-density polyethylene's (HDPE) surface properties along with the changes of chemical composition, as a consequence of Fe ion implantation with different fluences, were investigated. Applied implantation fluences were as follows: 5 × 1016, 1 × 1017, 2 × 1017 and 5 × 1017 ions cm−2, while the implantation energy was 95 keV. The samples were analyzed by X-ray photoelectron spectroscopy (XPS), Atomic Force Microscopy (AFM), Four point contact probe, Fourier transform infrared spectroscopy (FTIR) and contact angle measurements. Significant changes in the chemical composition were found by XPS and FTIR, which were followed by changes in surface morphology, increase of roughness, and decrease of sheet resistance that has a percolation threshold that starts for the fluence of 1 × 1017 ions cm−2. Surface free energy increases as a consequence of implantation, up to the fluence of 1 × 1017 ions cm−2, and then decreases for the 2 higher fluences. © 2019 Elsevier B.V.
T2  - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
T1  - Modification of polyethylene’s surface properties by high fluence Fe implantation
VL  - 462
SP  - 143
EP  - 153
DO  - 10.1016/j.nimb.2019.11.022
ER  - 

@article{
author = "Kisić, Danilo and Nenadović, Miloš and Barudžija, Tanja and Noga, Pavol and Vaňa, Dušan and Muška, Martin and Rakočević, Zlatko Lj.",
year = "2020",
abstract = "In the presented paper, changes of high-density polyethylene's (HDPE) surface properties along with the changes of chemical composition, as a consequence of Fe ion implantation with different fluences, were investigated. Applied implantation fluences were as follows: 5 × 1016, 1 × 1017, 2 × 1017 and 5 × 1017 ions cm−2, while the implantation energy was 95 keV. The samples were analyzed by X-ray photoelectron spectroscopy (XPS), Atomic Force Microscopy (AFM), Four point contact probe, Fourier transform infrared spectroscopy (FTIR) and contact angle measurements. Significant changes in the chemical composition were found by XPS and FTIR, which were followed by changes in surface morphology, increase of roughness, and decrease of sheet resistance that has a percolation threshold that starts for the fluence of 1 × 1017 ions cm−2. Surface free energy increases as a consequence of implantation, up to the fluence of 1 × 1017 ions cm−2, and then decreases for the 2 higher fluences. © 2019 Elsevier B.V.",
journal = "Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms",
title = "Modification of polyethylene’s surface properties by high fluence Fe implantation",
volume = "462",
pages = "143-153",
doi = "10.1016/j.nimb.2019.11.022"
}

Kisić, D., Nenadović, M., Barudžija, T., Noga, P., Vaňa, D., Muška, M.,& Rakočević, Z. Lj.. (2020). Modification of polyethylene’s surface properties by high fluence Fe implantation. in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 462, 143-153.
https://doi.org/10.1016/j.nimb.2019.11.022

Kisić D, Nenadović M, Barudžija T, Noga P, Vaňa D, Muška M, Rakočević ZL. Modification of polyethylene’s surface properties by high fluence Fe implantation. in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 2020;462:143-153.
doi:10.1016/j.nimb.2019.11.022 .

Kisić, Danilo, Nenadović, Miloš, Barudžija, Tanja, Noga, Pavol, Vaňa, Dušan, Muška, Martin, Rakočević, Zlatko Lj., "Modification of polyethylene’s surface properties by high fluence Fe implantation" in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 462 (2020):143-153,
https://doi.org/10.1016/j.nimb.2019.11.022 . .

TY  - JOUR
AU  - Čolović, Božana M.
AU  - Kisić, Danilo
AU  - Jokanović, Bojan
AU  - Rakočević, Zlatko Lj.
AU  - Nasov, Ilija
AU  - Trajkovska Petkoska, Anka
AU  - Jokanović, Vukoman R.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8350
AB  - Thin films of titanium oxides, titanium oxynitrides and titanium nitrides were deposited on glass substrates by the methods of direct current (DC) and pulsed magnetron sputtering and cathodic arc evaporation. Phase analysis of the deposited films by X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) showed the presence of phases with various Ti oxidative states, which indicated a high concentration of oxygen vacancies. The films morphology was investigated by scanning electron microscopy (SEM). Investigations of the films wettability, either with water or ethylene glycol, showed that it depends directly on the concentration of oxygen vacancies. The wettability mechanism was particularly discussed.
T2  - Materials Science-Poland
T1  - Wetting properties of titanium oxides, oxynitrides and nitrides obtained by DC and pulsed magnetron sputtering and cathodic arc evaporation
VL  - 37
IS  - 2
SP  - 173
EP  - 181
DO  - 10.2478/msp-2019-0031
ER  - 

@article{
author = "Čolović, Božana M. and Kisić, Danilo and Jokanović, Bojan and Rakočević, Zlatko Lj. and Nasov, Ilija and Trajkovska Petkoska, Anka and Jokanović, Vukoman R.",
year = "2019",
abstract = "Thin films of titanium oxides, titanium oxynitrides and titanium nitrides were deposited on glass substrates by the methods of direct current (DC) and pulsed magnetron sputtering and cathodic arc evaporation. Phase analysis of the deposited films by X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) showed the presence of phases with various Ti oxidative states, which indicated a high concentration of oxygen vacancies. The films morphology was investigated by scanning electron microscopy (SEM). Investigations of the films wettability, either with water or ethylene glycol, showed that it depends directly on the concentration of oxygen vacancies. The wettability mechanism was particularly discussed.",
journal = "Materials Science-Poland",
title = "Wetting properties of titanium oxides, oxynitrides and nitrides obtained by DC and pulsed magnetron sputtering and cathodic arc evaporation",
volume = "37",
number = "2",
pages = "173-181",
doi = "10.2478/msp-2019-0031"
}

Čolović, B. M., Kisić, D., Jokanović, B., Rakočević, Z. Lj., Nasov, I., Trajkovska Petkoska, A.,& Jokanović, V. R.. (2019). Wetting properties of titanium oxides, oxynitrides and nitrides obtained by DC and pulsed magnetron sputtering and cathodic arc evaporation. in Materials Science-Poland, 37(2), 173-181.
https://doi.org/10.2478/msp-2019-0031

Čolović BM, Kisić D, Jokanović B, Rakočević ZL, Nasov I, Trajkovska Petkoska A, Jokanović VR. Wetting properties of titanium oxides, oxynitrides and nitrides obtained by DC and pulsed magnetron sputtering and cathodic arc evaporation. in Materials Science-Poland. 2019;37(2):173-181.
doi:10.2478/msp-2019-0031 .

Čolović, Božana M., Kisić, Danilo, Jokanović, Bojan, Rakočević, Zlatko Lj., Nasov, Ilija, Trajkovska Petkoska, Anka, Jokanović, Vukoman R., "Wetting properties of titanium oxides, oxynitrides and nitrides obtained by DC and pulsed magnetron sputtering and cathodic arc evaporation" in Materials Science-Poland, 37, no. 2 (2019):173-181,
https://doi.org/10.2478/msp-2019-0031 . .

TY  - JOUR
AU  - Kljajević, Ljiljana M.
AU  - Melichova, Zuzana
AU  - Kisić, Danilo
AU  - Nenadović, Miloš
AU  - Todorović, Bratislav Ž.
AU  - Pavlović, Vladimir B.
AU  - Nenadović, Snežana S.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8440
AB  - The purpose of this investigation is to investigate the hydrophobicity of geopolymers, new alumino-silicate materials and the influence of Si/Al ratio on their surface properties. Contact angle measurement (CAM) as reliable indicator of hydrophobicity was determined for synthesized geopolymers using water and ethylene-glycol as reference liquids. Geopolymers were synthesized from various precursors: Kaolin, bentonite and diatomite. Characterization of phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. Contact angle measurements confirmed that the geopolymers synthesized from metakaolin are the most porous, which can be explained by the smallest Si/Al ratio. The maximum value of contact angle and free surface energy (110.2 mJ/m2) has been achieved for geopolymer synthesized by diatoms (GPMD). SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel and is significantly different from the micrographs of other two geopolymer samples, GPMB and GPMK. © 2018 Authors.
T2  - Science of Sintering
T1  - The influence of alumino-silicate matrix composition on surface hydrophobic properties
VL  - 51
IS  - 2
SP  - 163
EP  - 173
DO  - 10.2298/SOS1902163K
ER  - 

@article{
author = "Kljajević, Ljiljana M. and Melichova, Zuzana and Kisić, Danilo and Nenadović, Miloš and Todorović, Bratislav Ž. and Pavlović, Vladimir B. and Nenadović, Snežana S.",
year = "2019",
abstract = "The purpose of this investigation is to investigate the hydrophobicity of geopolymers, new alumino-silicate materials and the influence of Si/Al ratio on their surface properties. Contact angle measurement (CAM) as reliable indicator of hydrophobicity was determined for synthesized geopolymers using water and ethylene-glycol as reference liquids. Geopolymers were synthesized from various precursors: Kaolin, bentonite and diatomite. Characterization of phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. Contact angle measurements confirmed that the geopolymers synthesized from metakaolin are the most porous, which can be explained by the smallest Si/Al ratio. The maximum value of contact angle and free surface energy (110.2 mJ/m2) has been achieved for geopolymer synthesized by diatoms (GPMD). SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel and is significantly different from the micrographs of other two geopolymer samples, GPMB and GPMK. © 2018 Authors.",
journal = "Science of Sintering",
title = "The influence of alumino-silicate matrix composition on surface hydrophobic properties",
volume = "51",
number = "2",
pages = "163-173",
doi = "10.2298/SOS1902163K"
}

Kljajević, L. M., Melichova, Z., Kisić, D., Nenadović, M., Todorović, B. Ž., Pavlović, V. B.,& Nenadović, S. S.. (2019). The influence of alumino-silicate matrix composition on surface hydrophobic properties. in Science of Sintering, 51(2), 163-173.
https://doi.org/10.2298/SOS1902163K

Kljajević LM, Melichova Z, Kisić D, Nenadović M, Todorović BŽ, Pavlović VB, Nenadović SS. The influence of alumino-silicate matrix composition on surface hydrophobic properties. in Science of Sintering. 2019;51(2):163-173.
doi:10.2298/SOS1902163K .

Kljajević, Ljiljana M., Melichova, Zuzana, Kisić, Danilo, Nenadović, Miloš, Todorović, Bratislav Ž., Pavlović, Vladimir B., Nenadović, Snežana S., "The influence of alumino-silicate matrix composition on surface hydrophobic properties" in Science of Sintering, 51, no. 2 (2019):163-173,
https://doi.org/10.2298/SOS1902163K . .

TY  - JOUR
AU  - Nikolić, Violeta N.
AU  - Vasić, Milica M.
AU  - Kisić, Danilo
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S002245961930177X
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8160
AB  - Two samples containing 2-line ferrihydrite and copper oxide were synthesized by coprecipitation method, via variation of Fe3+ and Cu2+ precursors milimolar ratio (3:1 and 3:3.1), while the other synthesis parameters were kept constant. Annealing treatment at 1100 °C resulted in the formation of c-CuFe2O4-CuO-α-Fe2O3 and c-CuFe2O4-CuO nanocomposites, respectively. A comparison of properties of the prepared samples was performed by XRD, FTIR and EPR measurements. Formation mechanism of the nanocomposites is discussed with a reference to the influence of Jahn-Teller effect in CuO phase on the final CuFe2O4 structure. For the first time, it is shown that the amount of Fe3+ precursor is of key importance for the size of CuFe2O4 nanoparticles, and enables preparation of c-CuFe2O4 nanoparticles of the same crystallite size (46 nm) in different nanocomposite materials. © 2019 Elsevier Inc.
T2  - Journal of Solid State Chemistry
T1  - Observation of c-CuFe2O4 nanoparticles of the same crystallite size in different nanocomposite materials: The influence of Fe3+ cations
VL  - 275
SP  - 187
EP  - 196
DO  - 10.1016/j.jssc.2019.04.007
ER  - 

@article{
author = "Nikolić, Violeta N. and Vasić, Milica M. and Kisić, Danilo",
year = "2019",
abstract = "Two samples containing 2-line ferrihydrite and copper oxide were synthesized by coprecipitation method, via variation of Fe3+ and Cu2+ precursors milimolar ratio (3:1 and 3:3.1), while the other synthesis parameters were kept constant. Annealing treatment at 1100 °C resulted in the formation of c-CuFe2O4-CuO-α-Fe2O3 and c-CuFe2O4-CuO nanocomposites, respectively. A comparison of properties of the prepared samples was performed by XRD, FTIR and EPR measurements. Formation mechanism of the nanocomposites is discussed with a reference to the influence of Jahn-Teller effect in CuO phase on the final CuFe2O4 structure. For the first time, it is shown that the amount of Fe3+ precursor is of key importance for the size of CuFe2O4 nanoparticles, and enables preparation of c-CuFe2O4 nanoparticles of the same crystallite size (46 nm) in different nanocomposite materials. © 2019 Elsevier Inc.",
journal = "Journal of Solid State Chemistry",
title = "Observation of c-CuFe2O4 nanoparticles of the same crystallite size in different nanocomposite materials: The influence of Fe3+ cations",
volume = "275",
pages = "187-196",
doi = "10.1016/j.jssc.2019.04.007"
}

Nikolić, V. N., Vasić, M. M.,& Kisić, D.. (2019). Observation of c-CuFe2O4 nanoparticles of the same crystallite size in different nanocomposite materials: The influence of Fe3+ cations. in Journal of Solid State Chemistry, 275, 187-196.
https://doi.org/10.1016/j.jssc.2019.04.007

Nikolić VN, Vasić MM, Kisić D. Observation of c-CuFe2O4 nanoparticles of the same crystallite size in different nanocomposite materials: The influence of Fe3+ cations. in Journal of Solid State Chemistry. 2019;275:187-196.
doi:10.1016/j.jssc.2019.04.007 .

Nikolić, Violeta N., Vasić, Milica M., Kisić, Danilo, "Observation of c-CuFe2O4 nanoparticles of the same crystallite size in different nanocomposite materials: The influence of Fe3+ cations" in Journal of Solid State Chemistry, 275 (2019):187-196,
https://doi.org/10.1016/j.jssc.2019.04.007 . .

TY  - JOUR
AU  - Antusek, Andrej
AU  - Blasko, Martin
AU  - Urban, Miroslav
AU  - Noga, Pavol
AU  - Kisić, Danilo
AU  - Nenadović, Miloš
AU  - Lončarević, Davor
AU  - Rakočević, Zlatko Lj.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1809
AB  - We have studied processes of gold ion implantation in polyethylene (PE) by theoretical chemistry methods. Car-Parrinello molecular dynamics (CPMD) simulations of collisions and following chemical kinetics considerations lead to the conclusion that chemical bonds between gold atoms and PE chains are formed. We have identified and characterized by a DFT method various stable structures with C-Au, C-Au-C, C-Au-H and C-Au center dot center dot center dot H-2 types of chemical bonds. The binding energies (BE) of C-Au bonds are as high as 227 kJ mol(-1) and the bond analysis reveals a covalent bonding character. For the experimental detection of these structures in gold implanted PE, we predicted characteristic infra-red (IR) frequencies. The C-Au stretching vibrational modes lie around 500 cm(-1). Other characteristic frequencies lie in a band between 730 cm(-1) and 1500 cm(-1).
T2  - Physical Chemistry Chemical Physics
T1  - Density functional theory modeling of C-Au chemical bond formation in gold implanted polyethylene
VL  - 19
IS  - 42
SP  - 28897
EP  - 28906
DO  - 10.1039/c7cp05637k
ER  - 

@article{
author = "Antusek, Andrej and Blasko, Martin and Urban, Miroslav and Noga, Pavol and Kisić, Danilo and Nenadović, Miloš and Lončarević, Davor and Rakočević, Zlatko Lj.",
year = "2017",
abstract = "We have studied processes of gold ion implantation in polyethylene (PE) by theoretical chemistry methods. Car-Parrinello molecular dynamics (CPMD) simulations of collisions and following chemical kinetics considerations lead to the conclusion that chemical bonds between gold atoms and PE chains are formed. We have identified and characterized by a DFT method various stable structures with C-Au, C-Au-C, C-Au-H and C-Au center dot center dot center dot H-2 types of chemical bonds. The binding energies (BE) of C-Au bonds are as high as 227 kJ mol(-1) and the bond analysis reveals a covalent bonding character. For the experimental detection of these structures in gold implanted PE, we predicted characteristic infra-red (IR) frequencies. The C-Au stretching vibrational modes lie around 500 cm(-1). Other characteristic frequencies lie in a band between 730 cm(-1) and 1500 cm(-1).",
journal = "Physical Chemistry Chemical Physics",
title = "Density functional theory modeling of C-Au chemical bond formation in gold implanted polyethylene",
volume = "19",
number = "42",
pages = "28897-28906",
doi = "10.1039/c7cp05637k"
}

Antusek, A., Blasko, M., Urban, M., Noga, P., Kisić, D., Nenadović, M., Lončarević, D.,& Rakočević, Z. Lj.. (2017). Density functional theory modeling of C-Au chemical bond formation in gold implanted polyethylene. in Physical Chemistry Chemical Physics, 19(42), 28897-28906.
https://doi.org/10.1039/c7cp05637k

Antusek A, Blasko M, Urban M, Noga P, Kisić D, Nenadović M, Lončarević D, Rakočević ZL. Density functional theory modeling of C-Au chemical bond formation in gold implanted polyethylene. in Physical Chemistry Chemical Physics. 2017;19(42):28897-28906.
doi:10.1039/c7cp05637k .

Antusek, Andrej, Blasko, Martin, Urban, Miroslav, Noga, Pavol, Kisić, Danilo, Nenadović, Miloš, Lončarević, Davor, Rakočević, Zlatko Lj., "Density functional theory modeling of C-Au chemical bond formation in gold implanted polyethylene" in Physical Chemistry Chemical Physics, 19, no. 42 (2017):28897-28906,
https://doi.org/10.1039/c7cp05637k . .

TY  - JOUR
AU  - Antonijević, Đorđe
AU  - Jesthke, Anke
AU  - Čolović, Božana M.
AU  - Milovanović, Petar
AU  - Jevremovic, Danimir
AU  - Kisić, Danilo
AU  - vom Scheidt, Annika
AU  - Hahn, Michael
AU  - Amling, Michael
AU  - Jokanović, Vukoman R.
AU  - Busse, Bjoern
AU  - Đurić, Marija
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/847
AB  - Introduction: Calcium silicate cements (CSCs) with the addition of nanohydroxyapatite and calcium carbonate play a critical role in dental applications. To further improve their properties, particularly radiopacity and biointeractivity, the fluoride-containing radiopacifier ytterbium trifluoride (YbF3) was added to their composition, and biological and mechanical characteristics were evaluated. Methods: YbF3 was added to 3 different CSCs: cement I (CSC + calcium carbonate), cement II (CSC + nanohydroxyapatite), and Portland cement. Material characterization encompassed measurements of pH, calcium, ytterbium, and fluoride ion release; radiopacity; setting time; porosity; microindentation properties; wettability; and Fourier transform infrared spectroscopic, x-ray diffraction, and scanning electron microscopic analyses. Osteoblast- and osteoclast-like cells were grown on the materials surface to evaluate their adherence. Results: The addition of calcium carbonate, nanohydroxyapatite, and 30 wt% of YbF3 improved radiopacity and the setting time of experimental cements. The pH values did not differ among the groups. The greatest ytterbium and fluoride releases occurred in the Portland cement + YbF3 group. Combined x-ray diffraction and Fourier transform infrared spectroscopic analysis showed the presence of calcium hydroxide and calcium silicate hydrates. In addition, the presence of calcium ytterbium fluoride and ytterbium oxide proved that YbF3 reacted with cement compounds. Wettability of cement I + YbF3 was superior to other formulations, but its porosity and microindentation properties were weaker than in the Portland cement + YbF3 mixture. Cement II + YbF3 presented micromechanical indentation and porosity characteristics similar to the Portland-based cement formulation. Osteoclast- and osteoblast-like cells adhered to the cements surfaces without alteration of the cell structural integrity. Conclusions: YbF3-containing CSCs with nanostructured hydroxyapatite and calcium carbonate are well suited for dental application.
T2  - Journal of Endodontics
T1  - Addition of a Fluoride-containing Radiopacifier Improves Micromechanical and Biological Characteristics of Modified Calcium Silicate Cements
VL  - 41
IS  - 12
SP  - 2050
EP  - 2057
DO  - 10.1016/j.joen.2015.09.008
ER  - 

@article{
author = "Antonijević, Đorđe and Jesthke, Anke and Čolović, Božana M. and Milovanović, Petar and Jevremovic, Danimir and Kisić, Danilo and vom Scheidt, Annika and Hahn, Michael and Amling, Michael and Jokanović, Vukoman R. and Busse, Bjoern and Đurić, Marija",
year = "2015",
abstract = "Introduction: Calcium silicate cements (CSCs) with the addition of nanohydroxyapatite and calcium carbonate play a critical role in dental applications. To further improve their properties, particularly radiopacity and biointeractivity, the fluoride-containing radiopacifier ytterbium trifluoride (YbF3) was added to their composition, and biological and mechanical characteristics were evaluated. Methods: YbF3 was added to 3 different CSCs: cement I (CSC + calcium carbonate), cement II (CSC + nanohydroxyapatite), and Portland cement. Material characterization encompassed measurements of pH, calcium, ytterbium, and fluoride ion release; radiopacity; setting time; porosity; microindentation properties; wettability; and Fourier transform infrared spectroscopic, x-ray diffraction, and scanning electron microscopic analyses. Osteoblast- and osteoclast-like cells were grown on the materials surface to evaluate their adherence. Results: The addition of calcium carbonate, nanohydroxyapatite, and 30 wt% of YbF3 improved radiopacity and the setting time of experimental cements. The pH values did not differ among the groups. The greatest ytterbium and fluoride releases occurred in the Portland cement + YbF3 group. Combined x-ray diffraction and Fourier transform infrared spectroscopic analysis showed the presence of calcium hydroxide and calcium silicate hydrates. In addition, the presence of calcium ytterbium fluoride and ytterbium oxide proved that YbF3 reacted with cement compounds. Wettability of cement I + YbF3 was superior to other formulations, but its porosity and microindentation properties were weaker than in the Portland cement + YbF3 mixture. Cement II + YbF3 presented micromechanical indentation and porosity characteristics similar to the Portland-based cement formulation. Osteoclast- and osteoblast-like cells adhered to the cements surfaces without alteration of the cell structural integrity. Conclusions: YbF3-containing CSCs with nanostructured hydroxyapatite and calcium carbonate are well suited for dental application.",
journal = "Journal of Endodontics",
title = "Addition of a Fluoride-containing Radiopacifier Improves Micromechanical and Biological Characteristics of Modified Calcium Silicate Cements",
volume = "41",
number = "12",
pages = "2050-2057",
doi = "10.1016/j.joen.2015.09.008"
}

Antonijević, Đ., Jesthke, A., Čolović, B. M., Milovanović, P., Jevremovic, D., Kisić, D., vom Scheidt, A., Hahn, M., Amling, M., Jokanović, V. R., Busse, B.,& Đurić, M.. (2015). Addition of a Fluoride-containing Radiopacifier Improves Micromechanical and Biological Characteristics of Modified Calcium Silicate Cements. in Journal of Endodontics, 41(12), 2050-2057.
https://doi.org/10.1016/j.joen.2015.09.008

Antonijević Đ, Jesthke A, Čolović BM, Milovanović P, Jevremovic D, Kisić D, vom Scheidt A, Hahn M, Amling M, Jokanović VR, Busse B, Đurić M. Addition of a Fluoride-containing Radiopacifier Improves Micromechanical and Biological Characteristics of Modified Calcium Silicate Cements. in Journal of Endodontics. 2015;41(12):2050-2057.
doi:10.1016/j.joen.2015.09.008 .

Antonijević, Đorđe, Jesthke, Anke, Čolović, Božana M., Milovanović, Petar, Jevremovic, Danimir, Kisić, Danilo, vom Scheidt, Annika, Hahn, Michael, Amling, Michael, Jokanović, Vukoman R., Busse, Bjoern, Đurić, Marija, "Addition of a Fluoride-containing Radiopacifier Improves Micromechanical and Biological Characteristics of Modified Calcium Silicate Cements" in Journal of Endodontics, 41, no. 12 (2015):2050-2057,
https://doi.org/10.1016/j.joen.2015.09.008 . .

TY  - JOUR
AU  - Kisić, Danilo
AU  - Nenadović, Miloš
AU  - Štrbac, Svetlana
AU  - Adnađević, Borivoj
AU  - Rakočević, Zlatko Lj.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6015
AB  - The effect of ultraviolet (UV) ozone treatment on the surface properties of gold implanted high density polyethylene (HDPE) was investigated at a nanoscale using Atomic Force Microscopy (AFM). HDPE samples were modified by the implantation of gold ions at a dose of 5 x 10(15) ions/cm(2), using energies of 50, 100, 150, and 200 keV, and subsequently treated with UV/ozone. AFM surface topography images revealed that after UV/ozone treatment, the surface roughness of all Au/HDPE samples increased, while Power Spectral Density function increased only for samples implanted using higher energies, with a maximum for 150 keV. The chemical surface composition was homogenous in all cases, which was evidenced by appearance of single peaks in the histograms obtained from the phase AFM images. For UV/ozone treated samples, the shift of the peaks positions in the histograms to the higher values of the phase lag with respect to untreated ones indicated the decrease of surface hardness. Besides, a significant change of fractal dimension of surface grains is observed after UV/ozone treatment. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Effect of UV/ozone treatment on the nanoscale surface properties of gold implanted polyethylene
VL  - 307
SP  - 311
EP  - 318
DO  - 10.1016/j.apsusc.2014.04.032
ER  - 

@article{
author = "Kisić, Danilo and Nenadović, Miloš and Štrbac, Svetlana and Adnađević, Borivoj and Rakočević, Zlatko Lj.",
year = "2014",
abstract = "The effect of ultraviolet (UV) ozone treatment on the surface properties of gold implanted high density polyethylene (HDPE) was investigated at a nanoscale using Atomic Force Microscopy (AFM). HDPE samples were modified by the implantation of gold ions at a dose of 5 x 10(15) ions/cm(2), using energies of 50, 100, 150, and 200 keV, and subsequently treated with UV/ozone. AFM surface topography images revealed that after UV/ozone treatment, the surface roughness of all Au/HDPE samples increased, while Power Spectral Density function increased only for samples implanted using higher energies, with a maximum for 150 keV. The chemical surface composition was homogenous in all cases, which was evidenced by appearance of single peaks in the histograms obtained from the phase AFM images. For UV/ozone treated samples, the shift of the peaks positions in the histograms to the higher values of the phase lag with respect to untreated ones indicated the decrease of surface hardness. Besides, a significant change of fractal dimension of surface grains is observed after UV/ozone treatment. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Effect of UV/ozone treatment on the nanoscale surface properties of gold implanted polyethylene",
volume = "307",
pages = "311-318",
doi = "10.1016/j.apsusc.2014.04.032"
}

Kisić, D., Nenadović, M., Štrbac, S., Adnađević, B.,& Rakočević, Z. Lj.. (2014). Effect of UV/ozone treatment on the nanoscale surface properties of gold implanted polyethylene. in Applied Surface Science, 307, 311-318.
https://doi.org/10.1016/j.apsusc.2014.04.032

Kisić D, Nenadović M, Štrbac S, Adnađević B, Rakočević ZL. Effect of UV/ozone treatment on the nanoscale surface properties of gold implanted polyethylene. in Applied Surface Science. 2014;307:311-318.
doi:10.1016/j.apsusc.2014.04.032 .

Kisić, Danilo, Nenadović, Miloš, Štrbac, Svetlana, Adnađević, Borivoj, Rakočević, Zlatko Lj., "Effect of UV/ozone treatment on the nanoscale surface properties of gold implanted polyethylene" in Applied Surface Science, 307 (2014):311-318,
https://doi.org/10.1016/j.apsusc.2014.04.032 . .

TY  - JOUR
AU  - Brajkovic, Denis
AU  - Antonijević, Đorđe
AU  - Milovanović, Petar
AU  - Kisić, Danilo
AU  - Zelic, Ksenija
AU  - Đurić, Marija
AU  - Rakočević, Zlatko Lj.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6071
AB  - Background: Material surface free energy and surface roughness strongly influence the bacterial adhesion in oral cavity. The aim of this study was to analyze these two parameters in various commercial luting agents used for cementation of implant restorations. Materials and methods: Zinc-based, glass-ionomers, resin modified glass-ionomer and resin-cements were investigated. Contact angle and surface free energy were measured by contact angle analyzer using Image J software program. Materials average roughness and fractal dimension were calculated based on Atomic Force Microscope topography images. Results: Zinc phosphate cements presented significantly higher total surface free energy and significantly lower dispersive component of surface free energy compared to other groups, while resin-cements showed significantly lower polar component than other groups. The surface roughness and fractal dimension values were statistically the highest in the zinc phosphate cements and the lowest for the glass-ionomers cements. Conclusion: Glass-ionomers-cements presented lower values of surface free energy and surface roughness than zinc phosphate and resin cements, indicating that their surfaces are less prone to biofilm adhesion. Practical implications: Within limitations of an in vitro trial, our results indicate that glass-ionomers-cements could be the cements of choice for fixation of cement retained implant restorations due to superior surface properties compared to zinc phosphate and resin cements, which may result in reduced plaque formation and presumably prevent periimplant infection. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy
VL  - 311
SP  - 131
EP  - 138
DO  - 10.1016/j.apsusc.2014.05.027
ER  - 

@article{
author = "Brajkovic, Denis and Antonijević, Đorđe and Milovanović, Petar and Kisić, Danilo and Zelic, Ksenija and Đurić, Marija and Rakočević, Zlatko Lj.",
year = "2014",
abstract = "Background: Material surface free energy and surface roughness strongly influence the bacterial adhesion in oral cavity. The aim of this study was to analyze these two parameters in various commercial luting agents used for cementation of implant restorations. Materials and methods: Zinc-based, glass-ionomers, resin modified glass-ionomer and resin-cements were investigated. Contact angle and surface free energy were measured by contact angle analyzer using Image J software program. Materials average roughness and fractal dimension were calculated based on Atomic Force Microscope topography images. Results: Zinc phosphate cements presented significantly higher total surface free energy and significantly lower dispersive component of surface free energy compared to other groups, while resin-cements showed significantly lower polar component than other groups. The surface roughness and fractal dimension values were statistically the highest in the zinc phosphate cements and the lowest for the glass-ionomers cements. Conclusion: Glass-ionomers-cements presented lower values of surface free energy and surface roughness than zinc phosphate and resin cements, indicating that their surfaces are less prone to biofilm adhesion. Practical implications: Within limitations of an in vitro trial, our results indicate that glass-ionomers-cements could be the cements of choice for fixation of cement retained implant restorations due to superior surface properties compared to zinc phosphate and resin cements, which may result in reduced plaque formation and presumably prevent periimplant infection. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy",
volume = "311",
pages = "131-138",
doi = "10.1016/j.apsusc.2014.05.027"
}

Brajkovic, D., Antonijević, Đ., Milovanović, P., Kisić, D., Zelic, K., Đurić, M.,& Rakočević, Z. Lj.. (2014). Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy. in Applied Surface Science, 311, 131-138.
https://doi.org/10.1016/j.apsusc.2014.05.027

Brajkovic D, Antonijević Đ, Milovanović P, Kisić D, Zelic K, Đurić M, Rakočević ZL. Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy. in Applied Surface Science. 2014;311:131-138.
doi:10.1016/j.apsusc.2014.05.027 .

Brajkovic, Denis, Antonijević, Đorđe, Milovanović, Petar, Kisić, Danilo, Zelic, Ksenija, Đurić, Marija, Rakočević, Zlatko Lj., "Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy" in Applied Surface Science, 311 (2014):131-138,
https://doi.org/10.1016/j.apsusc.2014.05.027 . .