TY  - JOUR
AU  - Milovanović, Dubravka S.
AU  - Rajčić, Boris
AU  - Petronić, Sanja
AU  - Radulović, Aleksandra
AU  - Radak, Bojan
AU  - Gaković, Biljana M.
AU  - Zamfirescu, Marian
AU  - Albu, Catalina
AU  - Savović, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10116
AB  - The surface of a titanium-based alloy Ti6Al4V was subjected to modifications by a near-IR femtosecond Ti:Sapphire laser, emitting at 775 nm pulses of 200 fs duration, in single-pulse and multi-pulse regimes, with up to 400 accumulated pulses, and pulse energies ranging from 2.5 to 250 $$\upmu $$J. The whole range of induced effects is presented, from gentle ablation and pattern occurrence to substantial crater formation. Very observable laser-induced parallel periodic surface structures are reported, appearing both within the damage spot area, with low fluences, and at the peripheries of the craters, with higher fluences—but also on crater walls, and inside the crater structures. Damage threshold fluences $$({F}_{\mathrm{th}})$$and the incubation factor $$(\zeta )$$were also determined.
T2  - European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics
T1  - Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences
VL  - 76
IS  - 1
SP  - 2
DO  - 10.1140/epjd/s10053-021-00308-z
ER  - 

@article{
author = "Milovanović, Dubravka S. and Rajčić, Boris and Petronić, Sanja and Radulović, Aleksandra and Radak, Bojan and Gaković, Biljana M. and Zamfirescu, Marian and Albu, Catalina and Savović, Jelena",
year = "2022",
abstract = "The surface of a titanium-based alloy Ti6Al4V was subjected to modifications by a near-IR femtosecond Ti:Sapphire laser, emitting at 775 nm pulses of 200 fs duration, in single-pulse and multi-pulse regimes, with up to 400 accumulated pulses, and pulse energies ranging from 2.5 to 250 $$\upmu $$J. The whole range of induced effects is presented, from gentle ablation and pattern occurrence to substantial crater formation. Very observable laser-induced parallel periodic surface structures are reported, appearing both within the damage spot area, with low fluences, and at the peripheries of the craters, with higher fluences—but also on crater walls, and inside the crater structures. Damage threshold fluences $$({F}_{\mathrm{th}})$$and the incubation factor $$(\zeta )$$were also determined.",
journal = "European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics",
title = "Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences",
volume = "76",
number = "1",
pages = "2",
doi = "10.1140/epjd/s10053-021-00308-z"
}

Milovanović, D. S., Rajčić, B., Petronić, S., Radulović, A., Radak, B., Gaković, B. M., Zamfirescu, M., Albu, C.,& Savović, J.. (2022). Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 76(1), 2.
https://doi.org/10.1140/epjd/s10053-021-00308-z

Milovanović DS, Rajčić B, Petronić S, Radulović A, Radak B, Gaković BM, Zamfirescu M, Albu C, Savović J. Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics. 2022;76(1):2.
doi:10.1140/epjd/s10053-021-00308-z .

Milovanović, Dubravka S., Rajčić, Boris, Petronić, Sanja, Radulović, Aleksandra, Radak, Bojan, Gaković, Biljana M., Zamfirescu, Marian, Albu, Catalina, Savović, Jelena, "Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences" in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 76, no. 1 (2022):2,
https://doi.org/10.1140/epjd/s10053-021-00308-z . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Radak, Bojan
AU  - Milovanović, Dubravka S.
AU  - Kuzmanović, Miroslav M.
AU  - Savović, Jelena
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7809
AB  - Among numerous existing and developing techniques for the detection of air pollution, laser-based optical methods (LBM) are possibly the most promising ones. Unique sensing capabilities of LBM include high speed of analysis, high selectivity, sensitivity and accuracy, low detection limits, and remote detection. This paper gives a brief review of several laser-based systems for optical sensing of gas-phase chemical agents: laser intra-cavity, photoacoustic and laser-induced breakdown spectroscopy, and remote sensing based on differential absorption. For each method, a brief description of the principles of operation is given, and its analytical capabilities are outlined.
T2  - The European Physical Journal Plus
T1  - Laser-based optical techniques for the detection of chemical agents
VL  - 133
IS  - 7
SP  - 268
DO  - 10.1140/epjp/i2018-12145-4
ER  - 

@article{
author = "Trtica, Milan and Radak, Bojan and Milovanović, Dubravka S. and Kuzmanović, Miroslav M. and Savović, Jelena",
year = "2018",
abstract = "Among numerous existing and developing techniques for the detection of air pollution, laser-based optical methods (LBM) are possibly the most promising ones. Unique sensing capabilities of LBM include high speed of analysis, high selectivity, sensitivity and accuracy, low detection limits, and remote detection. This paper gives a brief review of several laser-based systems for optical sensing of gas-phase chemical agents: laser intra-cavity, photoacoustic and laser-induced breakdown spectroscopy, and remote sensing based on differential absorption. For each method, a brief description of the principles of operation is given, and its analytical capabilities are outlined.",
journal = "The European Physical Journal Plus",
title = "Laser-based optical techniques for the detection of chemical agents",
volume = "133",
number = "7",
pages = "268",
doi = "10.1140/epjp/i2018-12145-4"
}

Trtica, M., Radak, B., Milovanović, D. S., Kuzmanović, M. M.,& Savović, J.. (2018). Laser-based optical techniques for the detection of chemical agents. in The European Physical Journal Plus, 133(7), 268.
https://doi.org/10.1140/epjp/i2018-12145-4

Trtica M, Radak B, Milovanović DS, Kuzmanović MM, Savović J. Laser-based optical techniques for the detection of chemical agents. in The European Physical Journal Plus. 2018;133(7):268.
doi:10.1140/epjp/i2018-12145-4 .

Trtica, Milan, Radak, Bojan, Milovanović, Dubravka S., Kuzmanović, Miroslav M., Savović, Jelena, "Laser-based optical techniques for the detection of chemical agents" in The European Physical Journal Plus, 133, no. 7 (2018):268,
https://doi.org/10.1140/epjp/i2018-12145-4 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Gaković, Biljana M.
AU  - Zamfirescu, M.
AU  - Radu, C.
AU  - Peruško, Davor
AU  - Radak, Bojan
AU  - Ristoscu, Carmen
AU  - Zdravković, Slobodan
AU  - Luculescu, C. L.
AU  - Mihailescu, Ion N.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7164
AB  - Modification of single and complex nickel-palladium samples by laser processing in the femtosecond time domain was studied. The samples were processed by focused Ti:Sapphire laser beam (Clark CPA-2101) with 775 nm laser wavelength, 2 kHz repetition rate, 200 fs pulse duration. The laser-induced morphological modifications have shown dependence on the applied fluences and number of laser pulses. The formed surface nanostructures on the single NiPd/Si and multilayer 5x(Ni/Pd)/Si systems are compared with individual Ni and Pd thin films. The results show an increase in surface roughness, formation of parallel periodic surface structures, appearance of hydrodynamic features and ablation of surface material. At low number of pulses (less than 10 pulses) and low pulse energies range (not over 1.7 mu J), the two types of laser-induced periodic surface structure (LIPSS) can be observed: low and high spatial frequency LIPSS (HSFL and LSFL). For all samples, the measured LSFL periods were 720 nm for the ripples created solely on thin film surfaces during the single pulse action. In the case of the multi-pulse irradiation, the periodicities of created LSFLs on the all investigated thin films have shown tendency to reduction with increasing of pulse energies. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films
VL  - 417
SP  - 16
EP  - 22
DO  - 10.1016/j.apsusc.2016.12.142
ER  - 

@article{
author = "Petrović, Suzana and Gaković, Biljana M. and Zamfirescu, M. and Radu, C. and Peruško, Davor and Radak, Bojan and Ristoscu, Carmen and Zdravković, Slobodan and Luculescu, C. L. and Mihailescu, Ion N.",
year = "2017",
abstract = "Modification of single and complex nickel-palladium samples by laser processing in the femtosecond time domain was studied. The samples were processed by focused Ti:Sapphire laser beam (Clark CPA-2101) with 775 nm laser wavelength, 2 kHz repetition rate, 200 fs pulse duration. The laser-induced morphological modifications have shown dependence on the applied fluences and number of laser pulses. The formed surface nanostructures on the single NiPd/Si and multilayer 5x(Ni/Pd)/Si systems are compared with individual Ni and Pd thin films. The results show an increase in surface roughness, formation of parallel periodic surface structures, appearance of hydrodynamic features and ablation of surface material. At low number of pulses (less than 10 pulses) and low pulse energies range (not over 1.7 mu J), the two types of laser-induced periodic surface structure (LIPSS) can be observed: low and high spatial frequency LIPSS (HSFL and LSFL). For all samples, the measured LSFL periods were 720 nm for the ripples created solely on thin film surfaces during the single pulse action. In the case of the multi-pulse irradiation, the periodicities of created LSFLs on the all investigated thin films have shown tendency to reduction with increasing of pulse energies. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films",
volume = "417",
pages = "16-22",
doi = "10.1016/j.apsusc.2016.12.142"
}

Petrović, S., Gaković, B. M., Zamfirescu, M., Radu, C., Peruško, D., Radak, B., Ristoscu, C., Zdravković, S., Luculescu, C. L.,& Mihailescu, I. N.. (2017). Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films. in Applied Surface Science, 417, 16-22.
https://doi.org/10.1016/j.apsusc.2016.12.142

Petrović S, Gaković BM, Zamfirescu M, Radu C, Peruško D, Radak B, Ristoscu C, Zdravković S, Luculescu CL, Mihailescu IN. Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films. in Applied Surface Science. 2017;417:16-22.
doi:10.1016/j.apsusc.2016.12.142 .

Petrović, Suzana, Gaković, Biljana M., Zamfirescu, M., Radu, C., Peruško, Davor, Radak, Bojan, Ristoscu, Carmen, Zdravković, Slobodan, Luculescu, C. L., Mihailescu, Ion N., "Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films" in Applied Surface Science, 417 (2017):16-22,
https://doi.org/10.1016/j.apsusc.2016.12.142 . .

TY  - JOUR
AU  - Nikolić, Vladimir M.
AU  - Maslovara, Slađana Lj.
AU  - Tasić, Gvozden S.
AU  - Brdarić, Tanja
AU  - Laušević, Petar
AU  - Radak, Bojan
AU  - Marčeta Kaninski, Milica
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/705
AB  - This paper presents investigations on the influence of in-situ ionic activation using combination of three D-metals: Ni, Co and Moon the hydrogen evolution reaction (HER) mechanism and kinetics. Polarization measurements were performed to obtain kinetic parameters for the HER and the results are presented to show Tafel slopes, exchange current densities and apparent energy of activation. The values of the kinetic parameters confirm the existence of two Tafel slopes, in the case of NiCoMo based ionic activators (i.a.) in the investigated temperature range, with very high values of the exchange current density. Electrochemical impedance spectroscopy measurements were employed to further investigate the origin of the obtained electrocatalytic effect on the HER. The measurements were performed at several overpotentials and temperatures. It was found that co-deposition of Ni, Co and Mo species on the Ni cathode results in a large number of active sites for hydrogen adsorption, and a synergetic effect giving electronic structure suitable for the HER, are the main factors contributing to the enhanced HER kinetics. It was shown that EIS measurements had a crucial role in determining the HER mechanism, especially with the complex in-situ activation of the alkaline electrolysis. (C) 2015 Published by Elsevier B.V.
T2  - Applied Catalysis. B: Environmental
T1  - Kinetics of hydrogen evolution reaction in alkaline electrolysis on a Ni cathode in the presence of Ni-Co-Mo based ionic activators
VL  - 179
SP  - 88
EP  - 94
DO  - 10.1016/j.apcatb.2015.05.012
ER  - 

@article{
author = "Nikolić, Vladimir M. and Maslovara, Slađana Lj. and Tasić, Gvozden S. and Brdarić, Tanja and Laušević, Petar and Radak, Bojan and Marčeta Kaninski, Milica",
year = "2015",
abstract = "This paper presents investigations on the influence of in-situ ionic activation using combination of three D-metals: Ni, Co and Moon the hydrogen evolution reaction (HER) mechanism and kinetics. Polarization measurements were performed to obtain kinetic parameters for the HER and the results are presented to show Tafel slopes, exchange current densities and apparent energy of activation. The values of the kinetic parameters confirm the existence of two Tafel slopes, in the case of NiCoMo based ionic activators (i.a.) in the investigated temperature range, with very high values of the exchange current density. Electrochemical impedance spectroscopy measurements were employed to further investigate the origin of the obtained electrocatalytic effect on the HER. The measurements were performed at several overpotentials and temperatures. It was found that co-deposition of Ni, Co and Mo species on the Ni cathode results in a large number of active sites for hydrogen adsorption, and a synergetic effect giving electronic structure suitable for the HER, are the main factors contributing to the enhanced HER kinetics. It was shown that EIS measurements had a crucial role in determining the HER mechanism, especially with the complex in-situ activation of the alkaline electrolysis. (C) 2015 Published by Elsevier B.V.",
journal = "Applied Catalysis. B: Environmental",
title = "Kinetics of hydrogen evolution reaction in alkaline electrolysis on a Ni cathode in the presence of Ni-Co-Mo based ionic activators",
volume = "179",
pages = "88-94",
doi = "10.1016/j.apcatb.2015.05.012"
}

Nikolić, V. M., Maslovara, S. Lj., Tasić, G. S., Brdarić, T., Laušević, P., Radak, B.,& Marčeta Kaninski, M.. (2015). Kinetics of hydrogen evolution reaction in alkaline electrolysis on a Ni cathode in the presence of Ni-Co-Mo based ionic activators. in Applied Catalysis. B: Environmental, 179, 88-94.
https://doi.org/10.1016/j.apcatb.2015.05.012

Nikolić VM, Maslovara SL, Tasić GS, Brdarić T, Laušević P, Radak B, Marčeta Kaninski M. Kinetics of hydrogen evolution reaction in alkaline electrolysis on a Ni cathode in the presence of Ni-Co-Mo based ionic activators. in Applied Catalysis. B: Environmental. 2015;179:88-94.
doi:10.1016/j.apcatb.2015.05.012 .

Nikolić, Vladimir M., Maslovara, Slađana Lj., Tasić, Gvozden S., Brdarić, Tanja, Laušević, Petar, Radak, Bojan, Marčeta Kaninski, Milica, "Kinetics of hydrogen evolution reaction in alkaline electrolysis on a Ni cathode in the presence of Ni-Co-Mo based ionic activators" in Applied Catalysis. B: Environmental, 179 (2015):88-94,
https://doi.org/10.1016/j.apcatb.2015.05.012 . .

TY  - JOUR
AU  - Milovanović, Dubravka S.
AU  - Gaković, Biljana M.
AU  - Radu, C.
AU  - Zamfirescu, M.
AU  - Radak, Bojan
AU  - Petrović, Suzana
AU  - Rogić Miladinović, Zorana
AU  - Mihailescu, Ion N.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7058
AB  - In this work, we present the results obtained by femtosecond laser processing of AISI D2 steel and the widely applicable titanium-based alloy, Ti6Al4V. Patterning the materials surfaces was done by a Ti: sapphire system at 775 nm wavelength and 200 fs pulse duration, while varying the output pulse energies and the scanning speed. The formation of laser-induced periodical surface structures were found for both materials.
T2  - Physica Scripta
T1  - Femtosecond laser surface patterning of steel and titanium alloy
VL  - T162
DO  - 10.1088/0031-8949/2014/T162/014017
ER  - 

@article{
author = "Milovanović, Dubravka S. and Gaković, Biljana M. and Radu, C. and Zamfirescu, M. and Radak, Bojan and Petrović, Suzana and Rogić Miladinović, Zorana and Mihailescu, Ion N.",
year = "2014",
abstract = "In this work, we present the results obtained by femtosecond laser processing of AISI D2 steel and the widely applicable titanium-based alloy, Ti6Al4V. Patterning the materials surfaces was done by a Ti: sapphire system at 775 nm wavelength and 200 fs pulse duration, while varying the output pulse energies and the scanning speed. The formation of laser-induced periodical surface structures were found for both materials.",
journal = "Physica Scripta",
title = "Femtosecond laser surface patterning of steel and titanium alloy",
volume = "T162",
doi = "10.1088/0031-8949/2014/T162/014017"
}

Milovanović, D. S., Gaković, B. M., Radu, C., Zamfirescu, M., Radak, B., Petrović, S., Rogić Miladinović, Z.,& Mihailescu, I. N.. (2014). Femtosecond laser surface patterning of steel and titanium alloy. in Physica Scripta, T162.
https://doi.org/10.1088/0031-8949/2014/T162/014017

Milovanović DS, Gaković BM, Radu C, Zamfirescu M, Radak B, Petrović S, Rogić Miladinović Z, Mihailescu IN. Femtosecond laser surface patterning of steel and titanium alloy. in Physica Scripta. 2014;T162.
doi:10.1088/0031-8949/2014/T162/014017 .

Milovanović, Dubravka S., Gaković, Biljana M., Radu, C., Zamfirescu, M., Radak, Bojan, Petrović, Suzana, Rogić Miladinović, Zorana, Mihailescu, Ion N., "Femtosecond laser surface patterning of steel and titanium alloy" in Physica Scripta, T162 (2014),
https://doi.org/10.1088/0031-8949/2014/T162/014017 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Kovač, Janez
AU  - Siketic, Z.
AU  - Bogdanović-Radović, Ivančica
AU  - Gaković, Biljana M.
AU  - Radak, Bojan
AU  - Trtica, Milan
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5842
AB  - The surface oxidation of Ni/Ti bilayer, deposited on silicon substrate, affected by picosecond Nd: YAG laser radiation has been investigated. Fluence close to the target ablation threshold and multi-pulse laser irradiation regime were applied. Changes in the chemical composition of the formed surface oxide layer were studied by Elastic Recoil Detection Analysis (ERDA) and X-ray photoelectron spectroscopy (XPS). Morphological features analysis, at the oxide surface layer, was monitored, too. Laser modification as-deposited (Ni/Ti)/Si sample with 10 pulses induces a progressed interaction between Ni and Ti layers with the initial surface oxidation and formation of NiTi alloy phase. Progressed intermixing of components was achieved for the irradiation with 50 and more pulses, when all components were quite uniformly distributed to a depth of about 80 nm. An oxide layer was formed at the surface, with the specific combination of the oxide phases depending on the number of accumulated pulses. Changes in the morphological characteristics are reflected in the increase of the mean surface roughness and the generation of a certain number of cavities. These features are decreased with increasing number of pulses, caused by the surface melting and a pronounced mobility of the materials. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Materials Chemistry and Physics
T1  - Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses
VL  - 143
IS  - 2
SP  - 530
EP  - 535
DO  - 10.1016/j.matchemphys.2013.09.021
ER  - 

@article{
author = "Petrović, Suzana and Peruško, Davor and Kovač, Janez and Siketic, Z. and Bogdanović-Radović, Ivančica and Gaković, Biljana M. and Radak, Bojan and Trtica, Milan",
year = "2014",
abstract = "The surface oxidation of Ni/Ti bilayer, deposited on silicon substrate, affected by picosecond Nd: YAG laser radiation has been investigated. Fluence close to the target ablation threshold and multi-pulse laser irradiation regime were applied. Changes in the chemical composition of the formed surface oxide layer were studied by Elastic Recoil Detection Analysis (ERDA) and X-ray photoelectron spectroscopy (XPS). Morphological features analysis, at the oxide surface layer, was monitored, too. Laser modification as-deposited (Ni/Ti)/Si sample with 10 pulses induces a progressed interaction between Ni and Ti layers with the initial surface oxidation and formation of NiTi alloy phase. Progressed intermixing of components was achieved for the irradiation with 50 and more pulses, when all components were quite uniformly distributed to a depth of about 80 nm. An oxide layer was formed at the surface, with the specific combination of the oxide phases depending on the number of accumulated pulses. Changes in the morphological characteristics are reflected in the increase of the mean surface roughness and the generation of a certain number of cavities. These features are decreased with increasing number of pulses, caused by the surface melting and a pronounced mobility of the materials. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Materials Chemistry and Physics",
title = "Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses",
volume = "143",
number = "2",
pages = "530-535",
doi = "10.1016/j.matchemphys.2013.09.021"
}

Petrović, S., Peruško, D., Kovač, J., Siketic, Z., Bogdanović-Radović, I., Gaković, B. M., Radak, B.,& Trtica, M.. (2014). Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses. in Materials Chemistry and Physics, 143(2), 530-535.
https://doi.org/10.1016/j.matchemphys.2013.09.021

Petrović S, Peruško D, Kovač J, Siketic Z, Bogdanović-Radović I, Gaković BM, Radak B, Trtica M. Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses. in Materials Chemistry and Physics. 2014;143(2):530-535.
doi:10.1016/j.matchemphys.2013.09.021 .

Petrović, Suzana, Peruško, Davor, Kovač, Janez, Siketic, Z., Bogdanović-Radović, Ivančica, Gaković, Biljana M., Radak, Bojan, Trtica, Milan, "Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses" in Materials Chemistry and Physics, 143, no. 2 (2014):530-535,
https://doi.org/10.1016/j.matchemphys.2013.09.021 . .

TY  - JOUR
AU  - Maslovara, Slađana Lj.
AU  - Marčeta Kaninski, Milica
AU  - Perović, Ivana M.
AU  - Laušević, Petar
AU  - Tasić, Gvozden S.
AU  - Radak, Bojan
AU  - Nikolić, Vladimir M.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5779
AB  - In this manuscript we have presented the results of the use of ternary ionic activator in the alkaline water electrolysis. Novel Ni-Co-Mo based ionic activator was added in-situ to standard electrolyte. Energy consumption of the alkaline electrolyzer was determined at different current densities and elevated temperatures. Energy saving was higher at higher temperatures and higher operating current densities. Results showed that the reduction in energy consumption using Ni-Co-Mo based ionic activator was about 17%, compared to standard 6 M KOH. SEM morphology investigation proved the deposition of nickel, cobalt and molybdenum species on the cathode, greatly increasing the active surface area. UV/VIS spectroscopy was used to monitor changes in the electrolyte composition during the electrolytic process, and results show the decrease in the ionic activator concentration in the 6 M KOH. Our experiments point out a strong possibility of the usage of these ternary ionic activators in industrial alkaline electrolyzers. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
T2  - International Journal of Hydrogen Energy
T1  - Novel ternary Ni-Co-Mo based ionic activator for efficient alkaline water electrolysis
VL  - 38
IS  - 36
SP  - 15928
EP  - 15933
DO  - 10.1016/j.ijhydene.2013.10.039
ER  - 

@article{
author = "Maslovara, Slađana Lj. and Marčeta Kaninski, Milica and Perović, Ivana M. and Laušević, Petar and Tasić, Gvozden S. and Radak, Bojan and Nikolić, Vladimir M.",
year = "2013",
abstract = "In this manuscript we have presented the results of the use of ternary ionic activator in the alkaline water electrolysis. Novel Ni-Co-Mo based ionic activator was added in-situ to standard electrolyte. Energy consumption of the alkaline electrolyzer was determined at different current densities and elevated temperatures. Energy saving was higher at higher temperatures and higher operating current densities. Results showed that the reduction in energy consumption using Ni-Co-Mo based ionic activator was about 17%, compared to standard 6 M KOH. SEM morphology investigation proved the deposition of nickel, cobalt and molybdenum species on the cathode, greatly increasing the active surface area. UV/VIS spectroscopy was used to monitor changes in the electrolyte composition during the electrolytic process, and results show the decrease in the ionic activator concentration in the 6 M KOH. Our experiments point out a strong possibility of the usage of these ternary ionic activators in industrial alkaline electrolyzers. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.",
journal = "International Journal of Hydrogen Energy",
title = "Novel ternary Ni-Co-Mo based ionic activator for efficient alkaline water electrolysis",
volume = "38",
number = "36",
pages = "15928-15933",
doi = "10.1016/j.ijhydene.2013.10.039"
}

Maslovara, S. Lj., Marčeta Kaninski, M., Perović, I. M., Laušević, P., Tasić, G. S., Radak, B.,& Nikolić, V. M.. (2013). Novel ternary Ni-Co-Mo based ionic activator for efficient alkaline water electrolysis. in International Journal of Hydrogen Energy, 38(36), 15928-15933.
https://doi.org/10.1016/j.ijhydene.2013.10.039

Maslovara SL, Marčeta Kaninski M, Perović IM, Laušević P, Tasić GS, Radak B, Nikolić VM. Novel ternary Ni-Co-Mo based ionic activator for efficient alkaline water electrolysis. in International Journal of Hydrogen Energy. 2013;38(36):15928-15933.
doi:10.1016/j.ijhydene.2013.10.039 .

Maslovara, Slađana Lj., Marčeta Kaninski, Milica, Perović, Ivana M., Laušević, Petar, Tasić, Gvozden S., Radak, Bojan, Nikolić, Vladimir M., "Novel ternary Ni-Co-Mo based ionic activator for efficient alkaline water electrolysis" in International Journal of Hydrogen Energy, 38, no. 36 (2013):15928-15933,
https://doi.org/10.1016/j.ijhydene.2013.10.039 . .

TY  - JOUR
AU  - Milovanović, Dubravka S.
AU  - Petrović, Suzana
AU  - Shulepov, Mikhail A.
AU  - Tarasenko, Victor F.
AU  - Radak, Bojan
AU  - Miljanić, Šćepan S.
AU  - Trtica, Milan
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5662
AB  - The main effects of the interaction of UV emitting KrCl (at 222 nm) and XeCl (at 308 nm) excimer lasers with titanium alloy Ti6Al4V are presented. Single-pulse and multi-pulse irradiations were used, with varying laser beam fluences. The resulting interactions with the surface show thermal character, and produce: (i) damages in the form of craters at higher pulse counts and fluences of 7 J cm(-2) and 7.2 J cm(-2), which are far above the damage threshold; (ii) melt pools with visible wave-like structures at periphery; (iii) resolidified droplets and cracks at periphery (at higher pulse count), (iv) increasing content of oxygen, with a domination of TiO2. (C) 2013 Elsevier Ltd. All rights reserved.
T2  - Optics and Laser Technology
T1  - Titanium alloy surface modification by excimer laser irradiation
VL  - 54
SP  - 419
EP  - 427
DO  - 10.1016/j.optlastec.2013.06.025
ER  - 

@article{
author = "Milovanović, Dubravka S. and Petrović, Suzana and Shulepov, Mikhail A. and Tarasenko, Victor F. and Radak, Bojan and Miljanić, Šćepan S. and Trtica, Milan",
year = "2013",
abstract = "The main effects of the interaction of UV emitting KrCl (at 222 nm) and XeCl (at 308 nm) excimer lasers with titanium alloy Ti6Al4V are presented. Single-pulse and multi-pulse irradiations were used, with varying laser beam fluences. The resulting interactions with the surface show thermal character, and produce: (i) damages in the form of craters at higher pulse counts and fluences of 7 J cm(-2) and 7.2 J cm(-2), which are far above the damage threshold; (ii) melt pools with visible wave-like structures at periphery; (iii) resolidified droplets and cracks at periphery (at higher pulse count), (iv) increasing content of oxygen, with a domination of TiO2. (C) 2013 Elsevier Ltd. All rights reserved.",
journal = "Optics and Laser Technology",
title = "Titanium alloy surface modification by excimer laser irradiation",
volume = "54",
pages = "419-427",
doi = "10.1016/j.optlastec.2013.06.025"
}

Milovanović, D. S., Petrović, S., Shulepov, M. A., Tarasenko, V. F., Radak, B., Miljanić, Š. S.,& Trtica, M.. (2013). Titanium alloy surface modification by excimer laser irradiation. in Optics and Laser Technology, 54, 419-427.
https://doi.org/10.1016/j.optlastec.2013.06.025

Milovanović DS, Petrović S, Shulepov MA, Tarasenko VF, Radak B, Miljanić ŠS, Trtica M. Titanium alloy surface modification by excimer laser irradiation. in Optics and Laser Technology. 2013;54:419-427.
doi:10.1016/j.optlastec.2013.06.025 .

Milovanović, Dubravka S., Petrović, Suzana, Shulepov, Mikhail A., Tarasenko, Victor F., Radak, Bojan, Miljanić, Šćepan S., Trtica, Milan, "Titanium alloy surface modification by excimer laser irradiation" in Optics and Laser Technology, 54 (2013):419-427,
https://doi.org/10.1016/j.optlastec.2013.06.025 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Radak, Bojan
AU  - Peruško, Davor
AU  - Pelicon, P.
AU  - Kovač, Janez
AU  - Mitrić, Miodrag
AU  - Gaković, Biljana M.
AU  - Trtica, Milan
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5187
AB  - Laser-induced alloying effects on the composition and structure of different Ni/Ti multilayer structures were studied. Thin films composed of one, five, and ten (Ni/Ti) bilayers were deposited by DC ion sputtering on (1 0 0) Si wafers. Laser irradiations were performed by 150 ps pulses of a Nd:YAG laser operating at 1064 nm. The samples were characterized by Rutherford backscattering spectrometry (RBS), Auger electron spectroscopy (AES), X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM). At a laser fluence of 0.9 J cm(-2), interaction between Ni and Ti layers was initiated, and NiTi alloy formed in 5- and 10-bilayered samples. Progressed alloying was achieved at a laser fluence of 1.2 J cm(-2). The alloy was formed mostly within the heat affected zone (HAZ) of the sample. Surface segregation of titanium was followed by formation of a 25 nm thin TiO2 film on the surface of the multilayered structures. In addition, parallel periodic surface structures on the surfaces of the 5- and 10-bilayered samples were clearly recorded. Their period in the case of the 5-bilayered system (0.77 mu m) agrees very well with the predictions of the common theory, whereas, in the case of the 10-bilayered system, two periods of such structures are observed (1.43 mu m and 0.4 mu m), and none of them coincides with the prediction. (C) 2012 Elsevier B. V. All rights reserved.
T2  - Applied Surface Science
T1  - Laser-induced surface alloying in nanosized Ni/Ti multilayer structures
VL  - 264
SP  - 273
EP  - 279
DO  - 10.1016/j.apsusc.2012.10.012
ER  - 

@article{
author = "Petrović, Suzana and Radak, Bojan and Peruško, Davor and Pelicon, P. and Kovač, Janez and Mitrić, Miodrag and Gaković, Biljana M. and Trtica, Milan",
year = "2013",
abstract = "Laser-induced alloying effects on the composition and structure of different Ni/Ti multilayer structures were studied. Thin films composed of one, five, and ten (Ni/Ti) bilayers were deposited by DC ion sputtering on (1 0 0) Si wafers. Laser irradiations were performed by 150 ps pulses of a Nd:YAG laser operating at 1064 nm. The samples were characterized by Rutherford backscattering spectrometry (RBS), Auger electron spectroscopy (AES), X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM). At a laser fluence of 0.9 J cm(-2), interaction between Ni and Ti layers was initiated, and NiTi alloy formed in 5- and 10-bilayered samples. Progressed alloying was achieved at a laser fluence of 1.2 J cm(-2). The alloy was formed mostly within the heat affected zone (HAZ) of the sample. Surface segregation of titanium was followed by formation of a 25 nm thin TiO2 film on the surface of the multilayered structures. In addition, parallel periodic surface structures on the surfaces of the 5- and 10-bilayered samples were clearly recorded. Their period in the case of the 5-bilayered system (0.77 mu m) agrees very well with the predictions of the common theory, whereas, in the case of the 10-bilayered system, two periods of such structures are observed (1.43 mu m and 0.4 mu m), and none of them coincides with the prediction. (C) 2012 Elsevier B. V. All rights reserved.",
journal = "Applied Surface Science",
title = "Laser-induced surface alloying in nanosized Ni/Ti multilayer structures",
volume = "264",
pages = "273-279",
doi = "10.1016/j.apsusc.2012.10.012"
}

Petrović, S., Radak, B., Peruško, D., Pelicon, P., Kovač, J., Mitrić, M., Gaković, B. M.,& Trtica, M.. (2013). Laser-induced surface alloying in nanosized Ni/Ti multilayer structures. in Applied Surface Science, 264, 273-279.
https://doi.org/10.1016/j.apsusc.2012.10.012

Petrović S, Radak B, Peruško D, Pelicon P, Kovač J, Mitrić M, Gaković BM, Trtica M. Laser-induced surface alloying in nanosized Ni/Ti multilayer structures. in Applied Surface Science. 2013;264:273-279.
doi:10.1016/j.apsusc.2012.10.012 .

Petrović, Suzana, Radak, Bojan, Peruško, Davor, Pelicon, P., Kovač, Janez, Mitrić, Miodrag, Gaković, Biljana M., Trtica, Milan, "Laser-induced surface alloying in nanosized Ni/Ti multilayer structures" in Applied Surface Science, 264 (2013):273-279,
https://doi.org/10.1016/j.apsusc.2012.10.012 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Kovač, Janez
AU  - Panjan, Matjaž
AU  - Gaković, Biljana M.
AU  - Radak, Bojan
AU  - Janković Mandić, Ljiljana
AU  - Trtica, Milan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6993
AB  - Interaction of a Nd:YAG laser, operating at 1064 nm wavelength and pulse duration of 150 ps, with Ni/Ti multilayer thin films was studied. Nanocomposite structure of five (Ni/Ti) bilayers deposited by DC ion sputtering on Si(100) wafers to a total thickness of ca. 180 nm was treated with a laser pulse energy of about 55 mJ without focusing (fluence 1 J cm(-2)), Multi-pulse laser irradiation was done at an incidence angle of 22 degrees in air. The composition and surface morphology were monitored by Auger electron spectroscopy (AES), scanning electron microscopy (SEM), and by atomic force microscopy (AFM). The main part of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of composition and morphology on the target surface. Besides surface oxidation, the results show an increase in surface roughness, formation of a regularly rippled surface topography and microcracking. Depth profile AES analysis revealed that laser annealing induced intermixing between the components of individual Ni and Ti layers with indications of possible formation of NiTi intermetallic compounds. An interesting finding is the surface segregation of Ti, although the top layer was Ni, prior to laser irradiation. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Surface and Coatings Technology
T1  - Laser treatment of nanocomposite Ni/Ti multilayer thin films in air
VL  - 211
SP  - 93
EP  - 97
DO  - 10.1016/j.surfcoat.2011.07.035
ER  - 

@article{
author = "Petrović, Suzana and Peruško, Davor and Kovač, Janez and Panjan, Matjaž and Gaković, Biljana M. and Radak, Bojan and Janković Mandić, Ljiljana and Trtica, Milan",
year = "2012",
abstract = "Interaction of a Nd:YAG laser, operating at 1064 nm wavelength and pulse duration of 150 ps, with Ni/Ti multilayer thin films was studied. Nanocomposite structure of five (Ni/Ti) bilayers deposited by DC ion sputtering on Si(100) wafers to a total thickness of ca. 180 nm was treated with a laser pulse energy of about 55 mJ without focusing (fluence 1 J cm(-2)), Multi-pulse laser irradiation was done at an incidence angle of 22 degrees in air. The composition and surface morphology were monitored by Auger electron spectroscopy (AES), scanning electron microscopy (SEM), and by atomic force microscopy (AFM). The main part of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of composition and morphology on the target surface. Besides surface oxidation, the results show an increase in surface roughness, formation of a regularly rippled surface topography and microcracking. Depth profile AES analysis revealed that laser annealing induced intermixing between the components of individual Ni and Ti layers with indications of possible formation of NiTi intermetallic compounds. An interesting finding is the surface segregation of Ti, although the top layer was Ni, prior to laser irradiation. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Surface and Coatings Technology",
title = "Laser treatment of nanocomposite Ni/Ti multilayer thin films in air",
volume = "211",
pages = "93-97",
doi = "10.1016/j.surfcoat.2011.07.035"
}

Petrović, S., Peruško, D., Kovač, J., Panjan, M., Gaković, B. M., Radak, B., Janković Mandić, L.,& Trtica, M.. (2012). Laser treatment of nanocomposite Ni/Ti multilayer thin films in air. in Surface and Coatings Technology, 211, 93-97.
https://doi.org/10.1016/j.surfcoat.2011.07.035

Petrović S, Peruško D, Kovač J, Panjan M, Gaković BM, Radak B, Janković Mandić L, Trtica M. Laser treatment of nanocomposite Ni/Ti multilayer thin films in air. in Surface and Coatings Technology. 2012;211:93-97.
doi:10.1016/j.surfcoat.2011.07.035 .

Petrović, Suzana, Peruško, Davor, Kovač, Janez, Panjan, Matjaž, Gaković, Biljana M., Radak, Bojan, Janković Mandić, Ljiljana, Trtica, Milan, "Laser treatment of nanocomposite Ni/Ti multilayer thin films in air" in Surface and Coatings Technology, 211 (2012):93-97,
https://doi.org/10.1016/j.surfcoat.2011.07.035 . .

TY  - CONF
AU  - Gaković, Biljana M.
AU  - Radu, C.
AU  - Radak, Bojan
AU  - Zamfirescu, M.
AU  - Petrović, S.
AU  - Trtica, Milan
AU  - Mihailescu, I.N.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9308
AB  - We studied surface modification of a bi-layered coating (Al2O3/TiAlN/steel)
induced by fs laser with single and multi-pulse irradiation. The laser pulses
(λ=775 nm, τ=200 fs) were generated by a Ti:sapphire laser. The single pulse
threshold fluence for ablation of the top Al2O3 layer was Dath =0.56 Jcm-2. Single
pulse actions with fluence increased up to 16.47 Jcm-2 caused widening of ablated
area without significant change of the TiAlN layer underneath. In case of multipulse irradiation, periodical surface structures (LIPSS) were induced on the TiAlN
layer surface. The average periodicity of created LIPSS was 600 nm.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2012 : 11th international conference on fundamental and applied aspects of physical chemistry
T1  - Femtosecond laser ablation and structuring of a hard bi-layered coating
VL  - 1
SP  - 417
EP  - 419
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9308
ER  - 

@conference{
author = "Gaković, Biljana M. and Radu, C. and Radak, Bojan and Zamfirescu, M. and Petrović, S. and Trtica, Milan and Mihailescu, I.N.",
year = "2012",
abstract = "We studied surface modification of a bi-layered coating (Al2O3/TiAlN/steel)
induced by fs laser with single and multi-pulse irradiation. The laser pulses
(λ=775 nm, τ=200 fs) were generated by a Ti:sapphire laser. The single pulse
threshold fluence for ablation of the top Al2O3 layer was Dath =0.56 Jcm-2. Single
pulse actions with fluence increased up to 16.47 Jcm-2 caused widening of ablated
area without significant change of the TiAlN layer underneath. In case of multipulse irradiation, periodical surface structures (LIPSS) were induced on the TiAlN
layer surface. The average periodicity of created LIPSS was 600 nm.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2012 : 11th international conference on fundamental and applied aspects of physical chemistry",
title = "Femtosecond laser ablation and structuring of a hard bi-layered coating",
volume = "1",
pages = "417-419",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9308"
}

Gaković, B. M., Radu, C., Radak, B., Zamfirescu, M., Petrović, S., Trtica, M.,& Mihailescu, I.N.. (2012). Femtosecond laser ablation and structuring of a hard bi-layered coating. in Physical chemistry 2012 : 11th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., 1, 417-419.
https://hdl.handle.net/21.15107/rcub_vinar_9308

Gaković BM, Radu C, Radak B, Zamfirescu M, Petrović S, Trtica M, Mihailescu I. Femtosecond laser ablation and structuring of a hard bi-layered coating. in Physical chemistry 2012 : 11th international conference on fundamental and applied aspects of physical chemistry. 2012;1:417-419.
https://hdl.handle.net/21.15107/rcub_vinar_9308 .

Gaković, Biljana M., Radu, C., Radak, Bojan, Zamfirescu, M., Petrović, S., Trtica, Milan, Mihailescu, I.N., "Femtosecond laser ablation and structuring of a hard bi-layered coating" in Physical chemistry 2012 : 11th international conference on fundamental and applied aspects of physical chemistry, 1 (2012):417-419,
https://hdl.handle.net/21.15107/rcub_vinar_9308 .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Đustebek, Jasmina B.
AU  - Veljković, Filip M.
AU  - Radak, Bojan
AU  - Veljković, Miomir V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4666
AB  - RATIONALE: Theoretical calculations have shown that the first ionization energy of clusters of the type LinCl (n GT = 2), with more than eight valent electrons, is lower than that of alkali metal atoms; hence they are named superalkali. Superalkali clusters can mimic the chemical behavior of alkali metals and may be used as building blocks of new cluster-assembled materials. There is currently no reliable experimental proof of this kind of clusters and such proof is required. METHODS: The LinCl (n = 2-6) clusters were produced by a thermal ionization source of modified design, and mass selected by a magnetic-sector mass spectrometer. The modification pertains to the replacement of the side filaments by a cylinder in the triple-filament thermal ionization source. The sample, which is LiCl salt, was pressed into a ring and placed on the inner wall of the cylinder. RESULTS: It was observed that the ions of clusters with an even number of lithium atoms (Li2Cl+, Li4Cl+, Li6Cl+) are more stable than the odd-numbered ones (Li5Cl+, Li3Cl+). The ionization energies were determined to be 3.98 +/- 0.25 eV for Li2Cl, 4.10 +/- 0.25 eV for Li3Cl, 3.90 +/- 0.25 eV for Li4Cl, 4.01 +/- 0.25 eV for Li5Cl, and 4.09 +/- 0.25 eV for Li6Cl. The presence of a halogen atom reduces the ionization energy of the metal clusters. CONCLUSIONS: The thermal ionization source of modified design presents a suitable simple way to obtaining and measuring the ionization energies of very small lithium monochloride clusters. Clusters LinCl, n = 4 to 6, were detected for the first time. Copyright (C) 2012 John Wiley and Sons, Ltd.
T2  - Rapid Communications in Mass Spectrometry
T1  - Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry
VL  - 26
IS  - 4
SP  - 443
EP  - 448
DO  - 10.1002/rcm.6122
ER  - 

@article{
author = "Veličković, Suzana and Đustebek, Jasmina B. and Veljković, Filip M. and Radak, Bojan and Veljković, Miomir V.",
year = "2012",
abstract = "RATIONALE: Theoretical calculations have shown that the first ionization energy of clusters of the type LinCl (n GT = 2), with more than eight valent electrons, is lower than that of alkali metal atoms; hence they are named superalkali. Superalkali clusters can mimic the chemical behavior of alkali metals and may be used as building blocks of new cluster-assembled materials. There is currently no reliable experimental proof of this kind of clusters and such proof is required. METHODS: The LinCl (n = 2-6) clusters were produced by a thermal ionization source of modified design, and mass selected by a magnetic-sector mass spectrometer. The modification pertains to the replacement of the side filaments by a cylinder in the triple-filament thermal ionization source. The sample, which is LiCl salt, was pressed into a ring and placed on the inner wall of the cylinder. RESULTS: It was observed that the ions of clusters with an even number of lithium atoms (Li2Cl+, Li4Cl+, Li6Cl+) are more stable than the odd-numbered ones (Li5Cl+, Li3Cl+). The ionization energies were determined to be 3.98 +/- 0.25 eV for Li2Cl, 4.10 +/- 0.25 eV for Li3Cl, 3.90 +/- 0.25 eV for Li4Cl, 4.01 +/- 0.25 eV for Li5Cl, and 4.09 +/- 0.25 eV for Li6Cl. The presence of a halogen atom reduces the ionization energy of the metal clusters. CONCLUSIONS: The thermal ionization source of modified design presents a suitable simple way to obtaining and measuring the ionization energies of very small lithium monochloride clusters. Clusters LinCl, n = 4 to 6, were detected for the first time. Copyright (C) 2012 John Wiley and Sons, Ltd.",
journal = "Rapid Communications in Mass Spectrometry",
title = "Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry",
volume = "26",
number = "4",
pages = "443-448",
doi = "10.1002/rcm.6122"
}

Veličković, S., Đustebek, J. B., Veljković, F. M., Radak, B.,& Veljković, M. V.. (2012). Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry. in Rapid Communications in Mass Spectrometry, 26(4), 443-448.
https://doi.org/10.1002/rcm.6122

Veličković S, Đustebek JB, Veljković FM, Radak B, Veljković MV. Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry. in Rapid Communications in Mass Spectrometry. 2012;26(4):443-448.
doi:10.1002/rcm.6122 .

Veličković, Suzana, Đustebek, Jasmina B., Veljković, Filip M., Radak, Bojan, Veljković, Miomir V., "Formation and ionization energies of small chlorine-doped lithium clusters by thermal ionization mass spectrometry" in Rapid Communications in Mass Spectrometry, 26, no. 4 (2012):443-448,
https://doi.org/10.1002/rcm.6122 . .

TY  - JOUR
AU  - Gaković, Biljana M.
AU  - Radak, Bojan
AU  - Radu, C.
AU  - Zamfirescu, M.
AU  - Trtica, Milan
AU  - Petrović, Suzana
AU  - Stašić, Jelena
AU  - Panjan, Peter
AU  - Mihailescu, Ion N.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4993
AB  - We studied surface modification of a double layer protective coating on steel induced by single fs laser pulse irradiation in ambient air. The outer alumina (Al2O3) layer, which protects against aggressive environments, was 1.7 mu m thick and the titanium aluminum nitride (TiAlN) layer in contact with the steel surface had a thickness of 1.9 mu m. The pulses (lambda=775 nm, tau=200 fs) were generated by a Ti:sapphire laser source. The pulse energy was varied from 0.32 mu J to 50 mu J, corresponding to an incident laser fluence of 0.11 J cm(-2) to 16.47 J cm(-2). The surface damage threshold was found to be 0.20 J cm(-2) and the alumina layer removal was initiated at 0.56 J cm(-2). This selective ablation of alumina was possible in a wide range of fluences, up to the maximum applied, without ablating the TiAlN layer beneath. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Surface and Coatings Technology
T1  - Selective single pulse femtosecond laser removal of alumina (Al2O3) from a bilayered Al2O3/TiAlN/steel coating
VL  - 206
IS  - 24
SP  - 5080
EP  - 5084
DO  - 10.1016/j.surfcoat.2012.06.021
ER  - 

@article{
author = "Gaković, Biljana M. and Radak, Bojan and Radu, C. and Zamfirescu, M. and Trtica, Milan and Petrović, Suzana and Stašić, Jelena and Panjan, Peter and Mihailescu, Ion N.",
year = "2012",
abstract = "We studied surface modification of a double layer protective coating on steel induced by single fs laser pulse irradiation in ambient air. The outer alumina (Al2O3) layer, which protects against aggressive environments, was 1.7 mu m thick and the titanium aluminum nitride (TiAlN) layer in contact with the steel surface had a thickness of 1.9 mu m. The pulses (lambda=775 nm, tau=200 fs) were generated by a Ti:sapphire laser source. The pulse energy was varied from 0.32 mu J to 50 mu J, corresponding to an incident laser fluence of 0.11 J cm(-2) to 16.47 J cm(-2). The surface damage threshold was found to be 0.20 J cm(-2) and the alumina layer removal was initiated at 0.56 J cm(-2). This selective ablation of alumina was possible in a wide range of fluences, up to the maximum applied, without ablating the TiAlN layer beneath. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Surface and Coatings Technology",
title = "Selective single pulse femtosecond laser removal of alumina (Al2O3) from a bilayered Al2O3/TiAlN/steel coating",
volume = "206",
number = "24",
pages = "5080-5084",
doi = "10.1016/j.surfcoat.2012.06.021"
}

Gaković, B. M., Radak, B., Radu, C., Zamfirescu, M., Trtica, M., Petrović, S., Stašić, J., Panjan, P.,& Mihailescu, I. N.. (2012). Selective single pulse femtosecond laser removal of alumina (Al2O3) from a bilayered Al2O3/TiAlN/steel coating. in Surface and Coatings Technology, 206(24), 5080-5084.
https://doi.org/10.1016/j.surfcoat.2012.06.021

Gaković BM, Radak B, Radu C, Zamfirescu M, Trtica M, Petrović S, Stašić J, Panjan P, Mihailescu IN. Selective single pulse femtosecond laser removal of alumina (Al2O3) from a bilayered Al2O3/TiAlN/steel coating. in Surface and Coatings Technology. 2012;206(24):5080-5084.
doi:10.1016/j.surfcoat.2012.06.021 .

Gaković, Biljana M., Radak, Bojan, Radu, C., Zamfirescu, M., Trtica, Milan, Petrović, Suzana, Stašić, Jelena, Panjan, Peter, Mihailescu, Ion N., "Selective single pulse femtosecond laser removal of alumina (Al2O3) from a bilayered Al2O3/TiAlN/steel coating" in Surface and Coatings Technology, 206, no. 24 (2012):5080-5084,
https://doi.org/10.1016/j.surfcoat.2012.06.021 . .

TY  - JOUR
AU  - Miulović, Snežana M.
AU  - Maslovara, Slađana Lj.
AU  - Seović, Mina M.
AU  - Radak, Bojan
AU  - Marčeta Kaninski, Milica
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5167
AB  - The manuscript presents a report on the improved efficiency of alkaline electrolytic production of hydrogen by in situ adding directly into the electrolyte during the electrolytic process, cobalt and chrome based ionic activators. During electrolysis process the ionic activators deposit on the surface of the Ni cathode electrode and form an active, porous structure of high surface area. This simple process of adding in situ activating compounds directly into electrolyser is reducing the energy requirements per mass unit of hydrogen produced for about 15%, compared to non-activated system, for a number of current densities in a wide temperature range. Energy saving is higher at higher temperatures and on higher current densities. Structural and morphological characteristic of deposit formed on the cathode during the electrolytic process after in situ addition of activators, reveal interesting electrode surface pattern with highly developed surface area and uniform distribution of the pores. Obtained deposit also exhibit a long term stability. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
T2  - International Journal of Hydrogen Energy
T1  - Energy saving in electrolytic hydrogen production using Co-Cr activation - Part I
VL  - 37
IS  - 22
SP  - 16770
EP  - 16775
DO  - 10.1016/j.ijhydene.2012.08.075
ER  - 

@article{
author = "Miulović, Snežana M. and Maslovara, Slađana Lj. and Seović, Mina M. and Radak, Bojan and Marčeta Kaninski, Milica",
year = "2012",
abstract = "The manuscript presents a report on the improved efficiency of alkaline electrolytic production of hydrogen by in situ adding directly into the electrolyte during the electrolytic process, cobalt and chrome based ionic activators. During electrolysis process the ionic activators deposit on the surface of the Ni cathode electrode and form an active, porous structure of high surface area. This simple process of adding in situ activating compounds directly into electrolyser is reducing the energy requirements per mass unit of hydrogen produced for about 15%, compared to non-activated system, for a number of current densities in a wide temperature range. Energy saving is higher at higher temperatures and on higher current densities. Structural and morphological characteristic of deposit formed on the cathode during the electrolytic process after in situ addition of activators, reveal interesting electrode surface pattern with highly developed surface area and uniform distribution of the pores. Obtained deposit also exhibit a long term stability. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.",
journal = "International Journal of Hydrogen Energy",
title = "Energy saving in electrolytic hydrogen production using Co-Cr activation - Part I",
volume = "37",
number = "22",
pages = "16770-16775",
doi = "10.1016/j.ijhydene.2012.08.075"
}

Miulović, S. M., Maslovara, S. Lj., Seović, M. M., Radak, B.,& Marčeta Kaninski, M.. (2012). Energy saving in electrolytic hydrogen production using Co-Cr activation - Part I. in International Journal of Hydrogen Energy, 37(22), 16770-16775.
https://doi.org/10.1016/j.ijhydene.2012.08.075

Miulović SM, Maslovara SL, Seović MM, Radak B, Marčeta Kaninski M. Energy saving in electrolytic hydrogen production using Co-Cr activation - Part I. in International Journal of Hydrogen Energy. 2012;37(22):16770-16775.
doi:10.1016/j.ijhydene.2012.08.075 .

Miulović, Snežana M., Maslovara, Slađana Lj., Seović, Mina M., Radak, Bojan, Marčeta Kaninski, Milica, "Energy saving in electrolytic hydrogen production using Co-Cr activation - Part I" in International Journal of Hydrogen Energy, 37, no. 22 (2012):16770-16775,
https://doi.org/10.1016/j.ijhydene.2012.08.075 . .

TY  - CONF
AU  - Gaković, Biljana M.
AU  - Radu, C.
AU  - Zamfirescu, M.
AU  - Radak, Bojan
AU  - Trtica, Milan
AU  - Petrović, S.
AU  - Stašić, J.
AU  - Čekada, M.
AU  - Mihailescu, I. N.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10980
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade
T1  - Femtosecond laser ablation of alumina (Al2O3) from a multilayered coating
SP  - 154
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10980
ER  - 

@conference{
author = "Gaković, Biljana M. and Radu, C. and Zamfirescu, M. and Radak, Bojan and Trtica, Milan and Petrović, S. and Stašić, J. and Čekada, M. and Mihailescu, I. N.",
year = "2011",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade",
title = "Femtosecond laser ablation of alumina (Al2O3) from a multilayered coating",
pages = "154",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10980"
}

Gaković, B. M., Radu, C., Zamfirescu, M., Radak, B., Trtica, M., Petrović, S., Stašić, J., Čekada, M.,& Mihailescu, I. N.. (2011). Femtosecond laser ablation of alumina (Al2O3) from a multilayered coating. in PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 154.
https://hdl.handle.net/21.15107/rcub_vinar_10980

Gaković BM, Radu C, Zamfirescu M, Radak B, Trtica M, Petrović S, Stašić J, Čekada M, Mihailescu IN. Femtosecond laser ablation of alumina (Al2O3) from a multilayered coating. in PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade. 2011;:154.
https://hdl.handle.net/21.15107/rcub_vinar_10980 .

Gaković, Biljana M., Radu, C., Zamfirescu, M., Radak, Bojan, Trtica, Milan, Petrović, S., Stašić, J., Čekada, M., Mihailescu, I. N., "Femtosecond laser ablation of alumina (Al2O3) from a multilayered coating" in PHOTONICA2011 : 3rd International School and Conference on Photonics : book of abstracts; August 29- September 2, 2011; Belgrade (2011):154,
https://hdl.handle.net/21.15107/rcub_vinar_10980 .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Veljković, Filip M.
AU  - Perić-Grujić, Aleksandra A.
AU  - Radak, Bojan
AU  - Veljković, Miomir V.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4444
AB  - The electronic structure and properties of dipotassiummonohalides are important for understanding the unique physical and chemical behavior of MnX systems. In the present study, K2X (here X=F, Cl, Br, I) clusters were generated in the vapor over salts of the corresponding potassium halide, using a magnetic sector thermal ionization mass spectrometer. The ionization energies obtained for K2F, K2Cl, K2Br, and K2I molecules were 3.82 +/- 0.1eV, 3.68 +/- 0.1eV, 3.95 +/- 0.1eV, and 3.92 +/- 0.1, respectively. These experimental values of ionization energies for K2X (X=F, Br, and I) are presented for the first time. The ionization energy of K2Cl determined by thermal ionization corresponds to previous results obtained by photoionization mass spectrometry, and it agrees with the theoretical ionization energy calculated by the ab initio method. The presently obtained results support previous theoretical predictions that the excess electron in dipotassiummonohalide clusters is delocalized over two potassium atoms, which is characteristic for F-center clusters. Copyright (C) 2011 John Wiley and Sons, Ltd.
T2  - Rapid Communications in Mass Spectrometry
T1  - Ionization energies of K2X (X=F, Cl, Br, I) clusters
VL  - 25
IS  - 16
SP  - 2327
EP  - 2332
DO  - 10.1002/rcm.5128
ER  - 

@article{
author = "Veličković, Suzana and Veljković, Filip M. and Perić-Grujić, Aleksandra A. and Radak, Bojan and Veljković, Miomir V.",
year = "2011",
abstract = "The electronic structure and properties of dipotassiummonohalides are important for understanding the unique physical and chemical behavior of MnX systems. In the present study, K2X (here X=F, Cl, Br, I) clusters were generated in the vapor over salts of the corresponding potassium halide, using a magnetic sector thermal ionization mass spectrometer. The ionization energies obtained for K2F, K2Cl, K2Br, and K2I molecules were 3.82 +/- 0.1eV, 3.68 +/- 0.1eV, 3.95 +/- 0.1eV, and 3.92 +/- 0.1, respectively. These experimental values of ionization energies for K2X (X=F, Br, and I) are presented for the first time. The ionization energy of K2Cl determined by thermal ionization corresponds to previous results obtained by photoionization mass spectrometry, and it agrees with the theoretical ionization energy calculated by the ab initio method. The presently obtained results support previous theoretical predictions that the excess electron in dipotassiummonohalide clusters is delocalized over two potassium atoms, which is characteristic for F-center clusters. Copyright (C) 2011 John Wiley and Sons, Ltd.",
journal = "Rapid Communications in Mass Spectrometry",
title = "Ionization energies of K2X (X=F, Cl, Br, I) clusters",
volume = "25",
number = "16",
pages = "2327-2332",
doi = "10.1002/rcm.5128"
}

Veličković, S., Veljković, F. M., Perić-Grujić, A. A., Radak, B.,& Veljković, M. V.. (2011). Ionization energies of K2X (X=F, Cl, Br, I) clusters. in Rapid Communications in Mass Spectrometry, 25(16), 2327-2332.
https://doi.org/10.1002/rcm.5128

Veličković S, Veljković FM, Perić-Grujić AA, Radak B, Veljković MV. Ionization energies of K2X (X=F, Cl, Br, I) clusters. in Rapid Communications in Mass Spectrometry. 2011;25(16):2327-2332.
doi:10.1002/rcm.5128 .

Veličković, Suzana, Veljković, Filip M., Perić-Grujić, Aleksandra A., Radak, Bojan, Veljković, Miomir V., "Ionization energies of K2X (X=F, Cl, Br, I) clusters" in Rapid Communications in Mass Spectrometry, 25, no. 16 (2011):2327-2332,
https://doi.org/10.1002/rcm.5128 . .

TY  - JOUR
AU  - Kaluđerović, Branka V.
AU  - Trtica, Milan
AU  - Radak, Bojan
AU  - Stašić, Jelena
AU  - Musovic, S. S. Krstic
AU  - Dodevski, Vladimir
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4615
AB  - Interaction of pulsed transversely excited atmospheric (TEA) CO(2)-laser radiation at 10.6 mu m with nanoporous activated carbon cloth was investigated. Activated carbon cloth of different adsorption characteristics was used. Activated carbon cloth modifications were initiated by laser pulse intensities from 0.5 to 28 MW/cm(2), depending on the cloth adsorption characteristics. CO(2) laser radiation was effectively absorbed by the used activated carbon cloth and largely converted into thermal energy. The type of modification depended on laser power density, number of pulses, but mostly on material characteristics such as specific surface area. The higher the surface area of activated carbon cloth, the higher the damage threshold.
T2  - Journal of Materials Science and Technology
T1  - Analysis of the Interaction of Pulsed Laser with Nanoporous Activated Carbon Cloth
VL  - 27
IS  - 11
SP  - 979
EP  - 984
DO  - 10.1016/S1005-0302(11)60173-4
ER  - 

@article{
author = "Kaluđerović, Branka V. and Trtica, Milan and Radak, Bojan and Stašić, Jelena and Musovic, S. S. Krstic and Dodevski, Vladimir",
year = "2011",
abstract = "Interaction of pulsed transversely excited atmospheric (TEA) CO(2)-laser radiation at 10.6 mu m with nanoporous activated carbon cloth was investigated. Activated carbon cloth of different adsorption characteristics was used. Activated carbon cloth modifications were initiated by laser pulse intensities from 0.5 to 28 MW/cm(2), depending on the cloth adsorption characteristics. CO(2) laser radiation was effectively absorbed by the used activated carbon cloth and largely converted into thermal energy. The type of modification depended on laser power density, number of pulses, but mostly on material characteristics such as specific surface area. The higher the surface area of activated carbon cloth, the higher the damage threshold.",
journal = "Journal of Materials Science and Technology",
title = "Analysis of the Interaction of Pulsed Laser with Nanoporous Activated Carbon Cloth",
volume = "27",
number = "11",
pages = "979-984",
doi = "10.1016/S1005-0302(11)60173-4"
}

Kaluđerović, B. V., Trtica, M., Radak, B., Stašić, J., Musovic, S. S. K.,& Dodevski, V.. (2011). Analysis of the Interaction of Pulsed Laser with Nanoporous Activated Carbon Cloth. in Journal of Materials Science and Technology, 27(11), 979-984.
https://doi.org/10.1016/S1005-0302(11)60173-4

Kaluđerović BV, Trtica M, Radak B, Stašić J, Musovic SSK, Dodevski V. Analysis of the Interaction of Pulsed Laser with Nanoporous Activated Carbon Cloth. in Journal of Materials Science and Technology. 2011;27(11):979-984.
doi:10.1016/S1005-0302(11)60173-4 .

Kaluđerović, Branka V., Trtica, Milan, Radak, Bojan, Stašić, Jelena, Musovic, S. S. Krstic, Dodevski, Vladimir, "Analysis of the Interaction of Pulsed Laser with Nanoporous Activated Carbon Cloth" in Journal of Materials Science and Technology, 27, no. 11 (2011):979-984,
https://doi.org/10.1016/S1005-0302(11)60173-4 . .

TY  - JOUR
AU  - Gaković, Biljana M.
AU  - Radu, C.
AU  - Zamfirescu, M.
AU  - Radak, Bojan
AU  - Trtica, Milan
AU  - Petrović, Suzana
AU  - Panjan, Peter
AU  - Zupanic, F.
AU  - Ristoscu, Carmen
AU  - Mihailescu, Ion N.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4501
AB  - A target of multilayered TiAlN/TiN coating deposited on steel was irradiated by 200 fs pulses of a Ti:Sapphire laser, operating at 775 nm. Laser fluences of 1.16 J cm(-2) to 116 J cm(-2) produced a range of modifications, from well defined parallel surface structures on the coating, to deep craters in the substrate. Parameters for coating ablation were determined in terms of laser fluence and pulse count. A single-pulse damage threshold was found to be 0.66 J cm(-2) and the damage incubation factor 0.642. At lower laser fluences formation of laser induced parallel surface structures was evident, beginning from the first pulse, with a periodicity of about 580 nm. These structures remained and were pronounced at the rim of the damage spot even when the coating was completely ablated in the centre. (C) 2011 Elsevier B.V. All rights reserved.
T2  - Surface and Coatings Technology
T1  - Femtosecond laser modification of multilayered TiAlN/TiN coating
VL  - 206
IS  - 2-3
SP  - 411
EP  - 416
DO  - 10.1016/j.surfcoat.2011.07.042
ER  - 

@article{
author = "Gaković, Biljana M. and Radu, C. and Zamfirescu, M. and Radak, Bojan and Trtica, Milan and Petrović, Suzana and Panjan, Peter and Zupanic, F. and Ristoscu, Carmen and Mihailescu, Ion N.",
year = "2011",
abstract = "A target of multilayered TiAlN/TiN coating deposited on steel was irradiated by 200 fs pulses of a Ti:Sapphire laser, operating at 775 nm. Laser fluences of 1.16 J cm(-2) to 116 J cm(-2) produced a range of modifications, from well defined parallel surface structures on the coating, to deep craters in the substrate. Parameters for coating ablation were determined in terms of laser fluence and pulse count. A single-pulse damage threshold was found to be 0.66 J cm(-2) and the damage incubation factor 0.642. At lower laser fluences formation of laser induced parallel surface structures was evident, beginning from the first pulse, with a periodicity of about 580 nm. These structures remained and were pronounced at the rim of the damage spot even when the coating was completely ablated in the centre. (C) 2011 Elsevier B.V. All rights reserved.",
journal = "Surface and Coatings Technology",
title = "Femtosecond laser modification of multilayered TiAlN/TiN coating",
volume = "206",
number = "2-3",
pages = "411-416",
doi = "10.1016/j.surfcoat.2011.07.042"
}

Gaković, B. M., Radu, C., Zamfirescu, M., Radak, B., Trtica, M., Petrović, S., Panjan, P., Zupanic, F., Ristoscu, C.,& Mihailescu, I. N.. (2011). Femtosecond laser modification of multilayered TiAlN/TiN coating. in Surface and Coatings Technology, 206(2-3), 411-416.
https://doi.org/10.1016/j.surfcoat.2011.07.042

Gaković BM, Radu C, Zamfirescu M, Radak B, Trtica M, Petrović S, Panjan P, Zupanic F, Ristoscu C, Mihailescu IN. Femtosecond laser modification of multilayered TiAlN/TiN coating. in Surface and Coatings Technology. 2011;206(2-3):411-416.
doi:10.1016/j.surfcoat.2011.07.042 .

Gaković, Biljana M., Radu, C., Zamfirescu, M., Radak, Bojan, Trtica, Milan, Petrović, Suzana, Panjan, Peter, Zupanic, F., Ristoscu, Carmen, Mihailescu, Ion N., "Femtosecond laser modification of multilayered TiAlN/TiN coating" in Surface and Coatings Technology, 206, no. 2-3 (2011):411-416,
https://doi.org/10.1016/j.surfcoat.2011.07.042 . .

TY  - JOUR
AU  - Milovanović, Dubravka S.
AU  - Radak, Bojan
AU  - Gaković, Biljana M.
AU  - Batani, Dimitri
AU  - Momčilović, Miloš
AU  - Trtica, Milan
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4032
AB  - Surface modification of titanium based implant Ti6Al4V induced by an Nd:YAG laser operating at a wavelength of 266 nm, with pulses of 40 ps, is presented. It is shown that the laser beam at fluences 0.96J cm(-2) and 0.29J cm(-2) significantly modifies the alloy surface. The damage threshold is estimated at 0.12 J cm(-2). The irradiations at 0.96J cm-2 were accompanied by the occurrence of plasma. The characteristics of the damage are: (a) smoothed center of the damage area, (b) 20 nm cracks, (c) 200 nm parallel periodic surface structures (PSS). The periodicity of the PSS corresponds to the laser wavelength. Such modifications of the Ti6Al4V implant surface are applicable to medical practice. Surface morphology of the implant was monitored by optical microscopy (OM) and scanning electron microscopy (SEM) coupled to an energy dispersive spectroscopy (EDS) analyzer. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Surface morphology modifications of titanium based implant induced by 40 picosecond laser pulses at 266 nm
VL  - 501
IS  - 1
SP  - 89
EP  - 92
DO  - 10.1016/j.jallcom.2010.04.047
ER  - 

@article{
author = "Milovanović, Dubravka S. and Radak, Bojan and Gaković, Biljana M. and Batani, Dimitri and Momčilović, Miloš and Trtica, Milan",
year = "2010",
abstract = "Surface modification of titanium based implant Ti6Al4V induced by an Nd:YAG laser operating at a wavelength of 266 nm, with pulses of 40 ps, is presented. It is shown that the laser beam at fluences 0.96J cm(-2) and 0.29J cm(-2) significantly modifies the alloy surface. The damage threshold is estimated at 0.12 J cm(-2). The irradiations at 0.96J cm-2 were accompanied by the occurrence of plasma. The characteristics of the damage are: (a) smoothed center of the damage area, (b) 20 nm cracks, (c) 200 nm parallel periodic surface structures (PSS). The periodicity of the PSS corresponds to the laser wavelength. Such modifications of the Ti6Al4V implant surface are applicable to medical practice. Surface morphology of the implant was monitored by optical microscopy (OM) and scanning electron microscopy (SEM) coupled to an energy dispersive spectroscopy (EDS) analyzer. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Surface morphology modifications of titanium based implant induced by 40 picosecond laser pulses at 266 nm",
volume = "501",
number = "1",
pages = "89-92",
doi = "10.1016/j.jallcom.2010.04.047"
}

Milovanović, D. S., Radak, B., Gaković, B. M., Batani, D., Momčilović, M.,& Trtica, M.. (2010). Surface morphology modifications of titanium based implant induced by 40 picosecond laser pulses at 266 nm. in Journal of Alloys and Compounds, 501(1), 89-92.
https://doi.org/10.1016/j.jallcom.2010.04.047

Milovanović DS, Radak B, Gaković BM, Batani D, Momčilović M, Trtica M. Surface morphology modifications of titanium based implant induced by 40 picosecond laser pulses at 266 nm. in Journal of Alloys and Compounds. 2010;501(1):89-92.
doi:10.1016/j.jallcom.2010.04.047 .

Milovanović, Dubravka S., Radak, Bojan, Gaković, Biljana M., Batani, Dimitri, Momčilović, Miloš, Trtica, Milan, "Surface morphology modifications of titanium based implant induced by 40 picosecond laser pulses at 266 nm" in Journal of Alloys and Compounds, 501, no. 1 (2010):89-92,
https://doi.org/10.1016/j.jallcom.2010.04.047 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Gaković, Biljana M.
AU  - Peruško, Davor
AU  - Radak, Bojan
AU  - Desai, T.
AU  - Kovač, Janez
AU  - Panjan, Peter
AU  - Trtica, Milan
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3891
AB  - Picosecond (40 ps) pulsed Nd:YAG laser irradiation of a WTi thin film on silicon with a wavelength of 532 nm and a fluence 2.1 J/cm(2) was performed in air. This led to significant changes of the chemical composition and morphology on the surface of the WTi thin film. The results show an increase in surface roughness, due to formation of conical structures, about 50 nm wide in the base, and a very thin oxide layer composed of WO(3) and TiO(2), with a dominant TiO(2) phase at the top, within the depth of about 20 nm. The thickness of the oxide layer was dependent on the number of laser pulses. The samples were analyzed by scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy.
T2  - Applied Physics. A: Materials Science and Processing
T1  - Composition and structure modification of a WTi/Si system by short laser pulses
VL  - 98
IS  - 4
SP  - 843
EP  - 847
DO  - 10.1007/s00339-010-5549-8
ER  - 

@article{
author = "Petrović, Suzana and Gaković, Biljana M. and Peruško, Davor and Radak, Bojan and Desai, T. and Kovač, Janez and Panjan, Peter and Trtica, Milan",
year = "2010",
abstract = "Picosecond (40 ps) pulsed Nd:YAG laser irradiation of a WTi thin film on silicon with a wavelength of 532 nm and a fluence 2.1 J/cm(2) was performed in air. This led to significant changes of the chemical composition and morphology on the surface of the WTi thin film. The results show an increase in surface roughness, due to formation of conical structures, about 50 nm wide in the base, and a very thin oxide layer composed of WO(3) and TiO(2), with a dominant TiO(2) phase at the top, within the depth of about 20 nm. The thickness of the oxide layer was dependent on the number of laser pulses. The samples were analyzed by scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy.",
journal = "Applied Physics. A: Materials Science and Processing",
title = "Composition and structure modification of a WTi/Si system by short laser pulses",
volume = "98",
number = "4",
pages = "843-847",
doi = "10.1007/s00339-010-5549-8"
}

Petrović, S., Gaković, B. M., Peruško, D., Radak, B., Desai, T., Kovač, J., Panjan, P.,& Trtica, M.. (2010). Composition and structure modification of a WTi/Si system by short laser pulses. in Applied Physics. A: Materials Science and Processing, 98(4), 843-847.
https://doi.org/10.1007/s00339-010-5549-8

Petrović S, Gaković BM, Peruško D, Radak B, Desai T, Kovač J, Panjan P, Trtica M. Composition and structure modification of a WTi/Si system by short laser pulses. in Applied Physics. A: Materials Science and Processing. 2010;98(4):843-847.
doi:10.1007/s00339-010-5549-8 .

Petrović, Suzana, Gaković, Biljana M., Peruško, Davor, Radak, Bojan, Desai, T., Kovač, Janez, Panjan, Peter, Trtica, Milan, "Composition and structure modification of a WTi/Si system by short laser pulses" in Applied Physics. A: Materials Science and Processing, 98, no. 4 (2010):843-847,
https://doi.org/10.1007/s00339-010-5549-8 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Tarasenko, Victor F.
AU  - Gaković, Biljana M.
AU  - Panchenko, A. N.
AU  - Radak, Bojan
AU  - Stašić, Jelena
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6812
AB  - Morphology effects induced during interaction of mu s- (Transversely Excited Atmospheric (TEA) CO(2) laser) or ns- (HF laser) pulses with titanium nitride (TiN) coating, deposited on austenitic stainless steel AISI 316, were studied. Experiments were carried out in regime of focused laser beam in air at atmospheric pressure. The used laser fluences were found to be sufficient for inducing intensive surface modifications of the target. The energy absorbed from the CO(2) as well as HF laser beam is mainly converted into thermal energy, causing different effects like ablation, appearance of hydrodynamic features, etc. Morphology characteristics obtained during ns-pulses irradiation (HF laser) were different to those initiated by mu s-pulses (TEA CO(2) laser). The changes on the target surface in form of massive resolidifed droplets and crown-like structures were observed only for ns- (HF laser) pulses. It was found that these effects are a consequence of higher temperature and better coupling of the HF laser radiation with the target. Recent investigations of ps-Nd:YAG laser interaction with the same TiN coating showed that morphology picture is quite different including the reduction of thermal effect.
T2  - Russian Journal of Physical Chemistry A
T1  - Micro- and nanosecond laser TiN coating/steel modification: Morphology studies
VL  - 83
IS  - 9
SP  - 1577
EP  - 1581
DO  - 10.1134/S0036024409090295
ER  - 

@article{
author = "Trtica, Milan and Tarasenko, Victor F. and Gaković, Biljana M. and Panchenko, A. N. and Radak, Bojan and Stašić, Jelena",
year = "2009",
abstract = "Morphology effects induced during interaction of mu s- (Transversely Excited Atmospheric (TEA) CO(2) laser) or ns- (HF laser) pulses with titanium nitride (TiN) coating, deposited on austenitic stainless steel AISI 316, were studied. Experiments were carried out in regime of focused laser beam in air at atmospheric pressure. The used laser fluences were found to be sufficient for inducing intensive surface modifications of the target. The energy absorbed from the CO(2) as well as HF laser beam is mainly converted into thermal energy, causing different effects like ablation, appearance of hydrodynamic features, etc. Morphology characteristics obtained during ns-pulses irradiation (HF laser) were different to those initiated by mu s-pulses (TEA CO(2) laser). The changes on the target surface in form of massive resolidifed droplets and crown-like structures were observed only for ns- (HF laser) pulses. It was found that these effects are a consequence of higher temperature and better coupling of the HF laser radiation with the target. Recent investigations of ps-Nd:YAG laser interaction with the same TiN coating showed that morphology picture is quite different including the reduction of thermal effect.",
journal = "Russian Journal of Physical Chemistry A",
title = "Micro- and nanosecond laser TiN coating/steel modification: Morphology studies",
volume = "83",
number = "9",
pages = "1577-1581",
doi = "10.1134/S0036024409090295"
}

Trtica, M., Tarasenko, V. F., Gaković, B. M., Panchenko, A. N., Radak, B.,& Stašić, J.. (2009). Micro- and nanosecond laser TiN coating/steel modification: Morphology studies. in Russian Journal of Physical Chemistry A, 83(9), 1577-1581.
https://doi.org/10.1134/S0036024409090295

Trtica M, Tarasenko VF, Gaković BM, Panchenko AN, Radak B, Stašić J. Micro- and nanosecond laser TiN coating/steel modification: Morphology studies. in Russian Journal of Physical Chemistry A. 2009;83(9):1577-1581.
doi:10.1134/S0036024409090295 .

Trtica, Milan, Tarasenko, Victor F., Gaković, Biljana M., Panchenko, A. N., Radak, Bojan, Stašić, Jelena, "Micro- and nanosecond laser TiN coating/steel modification: Morphology studies" in Russian Journal of Physical Chemistry A, 83, no. 9 (2009):1577-1581,
https://doi.org/10.1134/S0036024409090295 . .

TY  - JOUR
AU  - Gaković, Biljana M.
AU  - Stašić, Jelena
AU  - Petrović, Suzana
AU  - Radak, Bojan
AU  - Krmpot, Aleksandar J.
AU  - Jelenković, Branislav
AU  - Trtica, Milan
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6844
AB  - Interaction of pulsed femtosecond Ti:sapphire laser (160 fs), operating at high repetition rate (75 MHz) at 800 nm, with nickel-based superalloy Inconel 600 and tungsten-titanium (WTi) target was studied. The WTi target was in form of thin film deposited on silicon substrate. Low laser fluence of maximum 50 mJ/cm(2) had modified the target surface during irradiation/exposure time of seconds or minutes. The radiation absorbed from the laser beam generates at the surface a series of effects, such as direct material vaporization, formation of clusters, etc. Morphological features of the targets can be summarized as: (a) intensive removal of material and crater appearance; (b) creation of nanostructures; (c) microcracking, etc. Ablation of Inconel 600 surface is effective, resulting in formation of holes with small diameter ( LT = 10 mu m) and relatively large depth ( LT = 50 mu m). In case of WTi target/thin film, the surrounding rim is not so expressed, and crater depths are lower. It can be concluded that the average laser power of the order of watts, pulse energies of the order of nanojoules and high repetition rates (MHz range) can successfully modify metallic materials.
T2  - Acta Physica Polonica A
T1  - Surface Modification of Metallic Targets with Ultrashort Laser Pulses
VL  - 116
IS  - 4
SP  - 611
EP  - 613
DO  - 10.12693/APhysPolA.116.611
ER  - 

@article{
author = "Gaković, Biljana M. and Stašić, Jelena and Petrović, Suzana and Radak, Bojan and Krmpot, Aleksandar J. and Jelenković, Branislav and Trtica, Milan",
year = "2009",
abstract = "Interaction of pulsed femtosecond Ti:sapphire laser (160 fs), operating at high repetition rate (75 MHz) at 800 nm, with nickel-based superalloy Inconel 600 and tungsten-titanium (WTi) target was studied. The WTi target was in form of thin film deposited on silicon substrate. Low laser fluence of maximum 50 mJ/cm(2) had modified the target surface during irradiation/exposure time of seconds or minutes. The radiation absorbed from the laser beam generates at the surface a series of effects, such as direct material vaporization, formation of clusters, etc. Morphological features of the targets can be summarized as: (a) intensive removal of material and crater appearance; (b) creation of nanostructures; (c) microcracking, etc. Ablation of Inconel 600 surface is effective, resulting in formation of holes with small diameter ( LT = 10 mu m) and relatively large depth ( LT = 50 mu m). In case of WTi target/thin film, the surrounding rim is not so expressed, and crater depths are lower. It can be concluded that the average laser power of the order of watts, pulse energies of the order of nanojoules and high repetition rates (MHz range) can successfully modify metallic materials.",
journal = "Acta Physica Polonica A",
title = "Surface Modification of Metallic Targets with Ultrashort Laser Pulses",
volume = "116",
number = "4",
pages = "611-613",
doi = "10.12693/APhysPolA.116.611"
}

Gaković, B. M., Stašić, J., Petrović, S., Radak, B., Krmpot, A. J., Jelenković, B.,& Trtica, M.. (2009). Surface Modification of Metallic Targets with Ultrashort Laser Pulses. in Acta Physica Polonica A, 116(4), 611-613.
https://doi.org/10.12693/APhysPolA.116.611

Gaković BM, Stašić J, Petrović S, Radak B, Krmpot AJ, Jelenković B, Trtica M. Surface Modification of Metallic Targets with Ultrashort Laser Pulses. in Acta Physica Polonica A. 2009;116(4):611-613.
doi:10.12693/APhysPolA.116.611 .

Gaković, Biljana M., Stašić, Jelena, Petrović, Suzana, Radak, Bojan, Krmpot, Aleksandar J., Jelenković, Branislav, Trtica, Milan, "Surface Modification of Metallic Targets with Ultrashort Laser Pulses" in Acta Physica Polonica A, 116, no. 4 (2009):611-613,
https://doi.org/10.12693/APhysPolA.116.611 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Radak, Bojan
AU  - Gaković, Biljana M.
AU  - Milovanović, Dubravka S.
AU  - Batani, Dimitri
AU  - Desai, T.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3639
AB  - Interaction of a Nd:YAG laser, operating at wavelengths of 1064 nm (23.6 J cm(-2) fluence) or 532 nm (25.9 J cm(-2) fluence), and pulse duration of 40 ps, with a titanium-based medical implant Ti6A14V alloy was studied. Surface at laser wavelengths 1064 nm and 532 rim, damage thresholds were estimated to be 0.9 J cm(-2) and 0.25 J cm(-2) respectively. At both laser wavelengths, the energy absorbed was mostly converted into thermal energy, forming craters, albeit about 50 times deeper at 1064 run than at 532 run. Periodic surface structures (PSS) were also formed with both laser wavelengths, concentric, and radial at micrometer scale (3 mu m to 15 mu m period), parallel at nanometer scale (800 nm period with the 1064 nm laser, 400 nm with The 532 nm laser). In the case of the 532 nm laser, the concentric Structures enlarge their period with accumulating laser pulse count. These features can help roughening of the implant surface and improve bio-compatibility.
T2  - Laser and Particle Beams
T1  - Surface modifications of Ti6A14V by a picosecond Nd:YAG laser
VL  - 27
IS  - 1
SP  - 85
EP  - 90
DO  - 10.1017/S0263034609000123
ER  - 

@article{
author = "Trtica, Milan and Radak, Bojan and Gaković, Biljana M. and Milovanović, Dubravka S. and Batani, Dimitri and Desai, T.",
year = "2009",
abstract = "Interaction of a Nd:YAG laser, operating at wavelengths of 1064 nm (23.6 J cm(-2) fluence) or 532 nm (25.9 J cm(-2) fluence), and pulse duration of 40 ps, with a titanium-based medical implant Ti6A14V alloy was studied. Surface at laser wavelengths 1064 nm and 532 rim, damage thresholds were estimated to be 0.9 J cm(-2) and 0.25 J cm(-2) respectively. At both laser wavelengths, the energy absorbed was mostly converted into thermal energy, forming craters, albeit about 50 times deeper at 1064 run than at 532 run. Periodic surface structures (PSS) were also formed with both laser wavelengths, concentric, and radial at micrometer scale (3 mu m to 15 mu m period), parallel at nanometer scale (800 nm period with the 1064 nm laser, 400 nm with The 532 nm laser). In the case of the 532 nm laser, the concentric Structures enlarge their period with accumulating laser pulse count. These features can help roughening of the implant surface and improve bio-compatibility.",
journal = "Laser and Particle Beams",
title = "Surface modifications of Ti6A14V by a picosecond Nd:YAG laser",
volume = "27",
number = "1",
pages = "85-90",
doi = "10.1017/S0263034609000123"
}

Trtica, M., Radak, B., Gaković, B. M., Milovanović, D. S., Batani, D.,& Desai, T.. (2009). Surface modifications of Ti6A14V by a picosecond Nd:YAG laser. in Laser and Particle Beams, 27(1), 85-90.
https://doi.org/10.1017/S0263034609000123

Trtica M, Radak B, Gaković BM, Milovanović DS, Batani D, Desai T. Surface modifications of Ti6A14V by a picosecond Nd:YAG laser. in Laser and Particle Beams. 2009;27(1):85-90.
doi:10.1017/S0263034609000123 .

Trtica, Milan, Radak, Bojan, Gaković, Biljana M., Milovanović, Dubravka S., Batani, Dimitri, Desai, T., "Surface modifications of Ti6A14V by a picosecond Nd:YAG laser" in Laser and Particle Beams, 27, no. 1 (2009):85-90,
https://doi.org/10.1017/S0263034609000123 . .

TY  - JOUR
AU  - Žujić, Aleksandra
AU  - Radak, Bojan
AU  - Filipović, Anka J.
AU  - Markovic, Dragan A.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3767
AB  - Although there are tendencies to develop a single common index which would describe an overall air quality status within an area, constructed from a choice of measurements of individual pollutants, indices describing individual pollutants themselves have several potentials which can be used in ways which are not possible with pollutant concentrations. On the case of Belgrade, Serbia, we investigated possibilities of using such indices for comparisons between pollutants, characterization of monitoring sites, and extending their use to include elements of population exposure. A methodology of adjusting the results obtained at monitoring stations located in severe pollution conditions, like street canyons, is proposed and used.
T2  - Environmental Monitoring and Assessment
T1  - Extending the use of air quality indices to reflect effective population exposure
VL  - 156
IS  - 1-4
SP  - 539
EP  - 549
DO  - 10.1007/s10661-008-0503-3
ER  - 

@article{
author = "Žujić, Aleksandra and Radak, Bojan and Filipović, Anka J. and Markovic, Dragan A.",
year = "2009",
abstract = "Although there are tendencies to develop a single common index which would describe an overall air quality status within an area, constructed from a choice of measurements of individual pollutants, indices describing individual pollutants themselves have several potentials which can be used in ways which are not possible with pollutant concentrations. On the case of Belgrade, Serbia, we investigated possibilities of using such indices for comparisons between pollutants, characterization of monitoring sites, and extending their use to include elements of population exposure. A methodology of adjusting the results obtained at monitoring stations located in severe pollution conditions, like street canyons, is proposed and used.",
journal = "Environmental Monitoring and Assessment",
title = "Extending the use of air quality indices to reflect effective population exposure",
volume = "156",
number = "1-4",
pages = "539-549",
doi = "10.1007/s10661-008-0503-3"
}

Žujić, A., Radak, B., Filipović, A. J.,& Markovic, D. A.. (2009). Extending the use of air quality indices to reflect effective population exposure. in Environmental Monitoring and Assessment, 156(1-4), 539-549.
https://doi.org/10.1007/s10661-008-0503-3

Žujić A, Radak B, Filipović AJ, Markovic DA. Extending the use of air quality indices to reflect effective population exposure. in Environmental Monitoring and Assessment. 2009;156(1-4):539-549.
doi:10.1007/s10661-008-0503-3 .

Žujić, Aleksandra, Radak, Bojan, Filipović, Anka J., Markovic, Dragan A., "Extending the use of air quality indices to reflect effective population exposure" in Environmental Monitoring and Assessment, 156, no. 1-4 (2009):539-549,
https://doi.org/10.1007/s10661-008-0503-3 . .

TY  - CONF
AU  - Radak, Bojan
AU  - Zuic, Aleksandra
AU  - Ignjatović, Ljubiša M.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6412
C3  - Abstracts of Papers of the American Chemical Society
T1  - ENVR 52-Advanced air quality indexing in a transition economy city: The Belgrade example
VL  - 238
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6412
ER  - 

@conference{
author = "Radak, Bojan and Zuic, Aleksandra and Ignjatović, Ljubiša M.",
year = "2009",
journal = "Abstracts of Papers of the American Chemical Society",
title = "ENVR 52-Advanced air quality indexing in a transition economy city: The Belgrade example",
volume = "238",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6412"
}

Radak, B., Zuic, A.,& Ignjatović, L. M.. (2009). ENVR 52-Advanced air quality indexing in a transition economy city: The Belgrade example. in Abstracts of Papers of the American Chemical Society, 238.
https://hdl.handle.net/21.15107/rcub_vinar_6412

Radak B, Zuic A, Ignjatović LM. ENVR 52-Advanced air quality indexing in a transition economy city: The Belgrade example. in Abstracts of Papers of the American Chemical Society. 2009;238.
https://hdl.handle.net/21.15107/rcub_vinar_6412 .

Radak, Bojan, Zuic, Aleksandra, Ignjatović, Ljubiša M., "ENVR 52-Advanced air quality indexing in a transition economy city: The Belgrade example" in Abstracts of Papers of the American Chemical Society, 238 (2009),
https://hdl.handle.net/21.15107/rcub_vinar_6412 .