TY  - JOUR
AU  - Georgijević, Radovan
AU  - Vujković, Milica
AU  - Gutić, Sanjin J.
AU  - Aliefendić, Meho
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Đokić, Veljko
AU  - Mentus, Slavko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4329
AB  - To contribute to the knowledge on the influence of synthesis procedure on the intercalation kinetics of lithium ions into phospho-olivines, LiFePO4/C composite samples (LFPC) were synthesized in two ways, the first one in a sol-gel procedure (SG), and the other in a solid-state reaction (SS). The X-ray diffractograms (XRD) of both samples overlapped with that of pure LiFePO4, taken from the crystallographic database. Scanning electron microscopy pictures indicated the high degree of interparticle sintering, which caused a considerable agglomerate growth. The results of potentiodynamic measurements in aqueous LiNO3 solution revealed that for SS sample, three times higher initial capacity from that of SG one, (amounting to 74 mAh g(-1) at 5 mV s(-1)). However, capacity fade on rising scan rate is much more expressed for SS sample than for SG one. We suggest that a different degree of material utilization due to the incomplete coverage of olivine particles by carbon explains this difference. The technique of separation of diffusion and capacitance currents was applied in a kinetic analysis, but it was shown to be inappropriate. We suggest the inapplicability of classic CV theory to the intercalation system accompanied by phase transition. Instead, a model of ohmic resistance determination of process kinetics was considered. LFPC-SS sample delivers three times larger capacity in LiNO3, amounting to 74 mAh g(-1) at 1 mV s(-1).
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Alloys and Compounds
T1  - The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution
EP  - 485
SP  - 475
VL  - 776
DO  - 10.1016/j.jallcom.2018.10.246
ER  - 

@article{
author = "Georgijević, Radovan and Vujković, Milica and Gutić, Sanjin J. and Aliefendić, Meho and Jugović, Dragana and Mitrić, Miodrag and Đokić, Veljko and Mentus, Slavko",
year = "2019",
abstract = "To contribute to the knowledge on the influence of synthesis procedure on the intercalation kinetics of lithium ions into phospho-olivines, LiFePO4/C composite samples (LFPC) were synthesized in two ways, the first one in a sol-gel procedure (SG), and the other in a solid-state reaction (SS). The X-ray diffractograms (XRD) of both samples overlapped with that of pure LiFePO4, taken from the crystallographic database. Scanning electron microscopy pictures indicated the high degree of interparticle sintering, which caused a considerable agglomerate growth. The results of potentiodynamic measurements in aqueous LiNO3 solution revealed that for SS sample, three times higher initial capacity from that of SG one, (amounting to 74 mAh g(-1) at 5 mV s(-1)). However, capacity fade on rising scan rate is much more expressed for SS sample than for SG one. We suggest that a different degree of material utilization due to the incomplete coverage of olivine particles by carbon explains this difference. The technique of separation of diffusion and capacitance currents was applied in a kinetic analysis, but it was shown to be inappropriate. We suggest the inapplicability of classic CV theory to the intercalation system accompanied by phase transition. Instead, a model of ohmic resistance determination of process kinetics was considered. LFPC-SS sample delivers three times larger capacity in LiNO3, amounting to 74 mAh g(-1) at 1 mV s(-1).",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution",
pages = "485-475",
volume = "776",
doi = "10.1016/j.jallcom.2018.10.246"
}

Georgijević, R., Vujković, M., Gutić, S. J., Aliefendić, M., Jugović, D., Mitrić, M., Đokić, V.,& Mentus, S.. (2019). The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 776, 475-485.
https://doi.org/10.1016/j.jallcom.2018.10.246

Georgijević R, Vujković M, Gutić SJ, Aliefendić M, Jugović D, Mitrić M, Đokić V, Mentus S. The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution. in Journal of Alloys and Compounds. 2019;776:475-485.
doi:10.1016/j.jallcom.2018.10.246 .

Georgijević, Radovan, Vujković, Milica, Gutić, Sanjin J., Aliefendić, Meho, Jugović, Dragana, Mitrić, Miodrag, Đokić, Veljko, Mentus, Slavko, "The influence of synthesis conditions on the redox behaviour of LiFePO4 in aqueous solution" in Journal of Alloys and Compounds, 776 (2019):475-485,
https://doi.org/10.1016/j.jallcom.2018.10.246 . .

TY  - JOUR
AU  - Nikolić, Irena
AU  - Karanović, Ljiljana
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Vuk
AU  - Mentus, Slavko
AU  - Radmilović, Velimir R.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2661
AB  - This paper presents a study on thermal stability of alkali activated slag (AAS) prepared from electric arc furnace slag (EAFS) using a mixture of alkaline sodium hydroxide and sodium silicate solutions. The samples were investigated by means of XRD, SEM, TG/DTA and porosity analysis. Compressive strengths of MS samples before and after exposure to elevated temperatures ranging from 600 degrees C to 1000 degrees C were determined. The significant microstructural modifications highlighted by changes in porosity due to the sintering process are responsible for the strengthening of MS sample after heating at 600,800 and 1000 degrees C. Moreover, in MS sample after heating to and above 600 degrees C wustite transforms to spinel.
PB  - Elsevier Science Bv, Amsterdam
T2  - Materials Letters
T1  - Improved compressive strength of alkali activated slag upon heating
EP  - 254
SP  - 251
VL  - 133
DO  - 10.1016/j.matlet.2014.07.021
ER  - 

@article{
author = "Nikolić, Irena and Karanović, Ljiljana and Janković-Častvan, Ivona and Radmilović, Vuk and Mentus, Slavko and Radmilović, Velimir R.",
year = "2014",
abstract = "This paper presents a study on thermal stability of alkali activated slag (AAS) prepared from electric arc furnace slag (EAFS) using a mixture of alkaline sodium hydroxide and sodium silicate solutions. The samples were investigated by means of XRD, SEM, TG/DTA and porosity analysis. Compressive strengths of MS samples before and after exposure to elevated temperatures ranging from 600 degrees C to 1000 degrees C were determined. The significant microstructural modifications highlighted by changes in porosity due to the sintering process are responsible for the strengthening of MS sample after heating at 600,800 and 1000 degrees C. Moreover, in MS sample after heating to and above 600 degrees C wustite transforms to spinel.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Materials Letters",
title = "Improved compressive strength of alkali activated slag upon heating",
pages = "254-251",
volume = "133",
doi = "10.1016/j.matlet.2014.07.021"
}

Nikolić, I., Karanović, L., Janković-Častvan, I., Radmilović, V., Mentus, S.,& Radmilović, V. R.. (2014). Improved compressive strength of alkali activated slag upon heating. in Materials Letters
Elsevier Science Bv, Amsterdam., 133, 251-254.
https://doi.org/10.1016/j.matlet.2014.07.021

Nikolić I, Karanović L, Janković-Častvan I, Radmilović V, Mentus S, Radmilović VR. Improved compressive strength of alkali activated slag upon heating. in Materials Letters. 2014;133:251-254.
doi:10.1016/j.matlet.2014.07.021 .

Nikolić, Irena, Karanović, Ljiljana, Janković-Častvan, Ivona, Radmilović, Vuk, Mentus, Slavko, Radmilović, Velimir R., "Improved compressive strength of alkali activated slag upon heating" in Materials Letters, 133 (2014):251-254,
https://doi.org/10.1016/j.matlet.2014.07.021 . .

TY  - CONF
AU  - Nikolić, Irena
AU  - Janković-Častvan, Ivona
AU  - Radmilović, Vuk
AU  - Karanović, Ljiljana
AU  - Marković, Smilja
AU  - Mentus, Slavko
AU  - Radmilović, Velimir R.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2289
AB  - The remelting of iron and steel scrap in the electric arc furnaces generates the non-hazardous waste – electric arc furnace slag (EAFS), which can be disposed of to appropriate landfills. Currently, this slag found its application in conventional concrete production to improve its mechanical, chemical and physical properties, as an additive to asphalt base mixture and in cement production. In this study we have investigated the effect of alkaline dosage on the strength and thermal resistance of EAFS based geopolymers. The results have shown that these materials are mainly amorphous with some crystal phases remained from the undisolved EAFS such as larnite, gehlenite, wuestite, monticellite, calcite. Compressive strength of these materials is strongly influenced by the alkaline dosage. An increase of NaOH concentration in the interval of 7-10 M leads to the increase of geopolymer’s strength. The maximal compressive strength of EAFS based geopolymer was obtained using the 10 M NaOH. Further increase of alkaline dosage to the value of 13 M NaOH results in the slight decrease of the geopolymer strength. Additionally, depending on the synthesis parameters, EAFS based geopolymers exhibit improved durability in high temperature environments in comparison with conventional cement based materials. All investigated samples exhibit a shrinkage which is attributed to the change of porosity. The mass loss due to the loss of water was also observed. This research was supported by a Ministry of Science of Montenegro under the contract No 01-460.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
T1  - Geopolymer materials based on the electric arc furnace slag
EP  - 47
SP  - 47
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2289
ER  - 

@conference{
author = "Nikolić, Irena and Janković-Častvan, Ivona and Radmilović, Vuk and Karanović, Ljiljana and Marković, Smilja and Mentus, Slavko and Radmilović, Velimir R.",
year = "2013",
abstract = "The remelting of iron and steel scrap in the electric arc furnaces generates the non-hazardous waste – electric arc furnace slag (EAFS), which can be disposed of to appropriate landfills. Currently, this slag found its application in conventional concrete production to improve its mechanical, chemical and physical properties, as an additive to asphalt base mixture and in cement production. In this study we have investigated the effect of alkaline dosage on the strength and thermal resistance of EAFS based geopolymers. The results have shown that these materials are mainly amorphous with some crystal phases remained from the undisolved EAFS such as larnite, gehlenite, wuestite, monticellite, calcite. Compressive strength of these materials is strongly influenced by the alkaline dosage. An increase of NaOH concentration in the interval of 7-10 M leads to the increase of geopolymer’s strength. The maximal compressive strength of EAFS based geopolymer was obtained using the 10 M NaOH. Further increase of alkaline dosage to the value of 13 M NaOH results in the slight decrease of the geopolymer strength. Additionally, depending on the synthesis parameters, EAFS based geopolymers exhibit improved durability in high temperature environments in comparison with conventional cement based materials. All investigated samples exhibit a shrinkage which is attributed to the change of porosity. The mass loss due to the loss of water was also observed. This research was supported by a Ministry of Science of Montenegro under the contract No 01-460.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts",
title = "Geopolymer materials based on the electric arc furnace slag",
pages = "47-47",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2289"
}

Nikolić, I., Janković-Častvan, I., Radmilović, V., Karanović, L., Marković, S., Mentus, S.,& Radmilović, V. R.. (2013). Geopolymer materials based on the electric arc furnace slag. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 47-47.
https://hdl.handle.net/21.15107/rcub_technorep_2289

Nikolić I, Janković-Častvan I, Radmilović V, Karanović L, Marković S, Mentus S, Radmilović VR. Geopolymer materials based on the electric arc furnace slag. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts. 2013;:47-47.
https://hdl.handle.net/21.15107/rcub_technorep_2289 .

Nikolić, Irena, Janković-Častvan, Ivona, Radmilović, Vuk, Karanović, Ljiljana, Marković, Smilja, Mentus, Slavko, Radmilović, Velimir R., "Geopolymer materials based on the electric arc furnace slag" in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts (2013):47-47,
https://hdl.handle.net/21.15107/rcub_technorep_2289 .

TY  - JOUR
AU  - Jovanovic, Zoran
AU  - Kalijadis, Ana
AU  - Vasiljević-Radović, Dana
AU  - Eric, Marko
AU  - Lausevic, Mila
AU  - Mentus, Slavko
AU  - Laušević, Zoran
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5639
AB  - Glassy carbon plates were irradiated with 15 key H(+) ion-beam in the fluence range of 1 x 10(16)-3 x 10(18) ion cm(-2). The influence of ion irradiation on surface morphology and topology was examined by scanning electron and atomic force microscopy. Structural changes were monitored by Raman spectrometry, while changes of wettability and the content of surface oxygen complexes were examined by contact angle measurements and temperature programmed desorption. Elastic recoil detection analysis was applied for determination of hydrogen concentration profiles in irradiated samples. Cyclic voltammetry was used for the assessment of the electrochemical properties of modified glassy carbon electrodes. It was concluded that there is critical fluence range (2 x 10(17)-5 x 10(17) ion cm(-2)) inside of which significant changes of glassy carbon properties occur.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Carbon
T1  - Modification of glassy carbon properties under low energy proton irradiation
EP  - 3746
IS  - 12
SP  - 3737
VL  - 49
DO  - 10.1016/j.carbon.2011.05.006
ER  - 

@article{
author = "Jovanovic, Zoran and Kalijadis, Ana and Vasiljević-Radović, Dana and Eric, Marko and Lausevic, Mila and Mentus, Slavko and Laušević, Zoran",
year = "2011",
abstract = "Glassy carbon plates were irradiated with 15 key H(+) ion-beam in the fluence range of 1 x 10(16)-3 x 10(18) ion cm(-2). The influence of ion irradiation on surface morphology and topology was examined by scanning electron and atomic force microscopy. Structural changes were monitored by Raman spectrometry, while changes of wettability and the content of surface oxygen complexes were examined by contact angle measurements and temperature programmed desorption. Elastic recoil detection analysis was applied for determination of hydrogen concentration profiles in irradiated samples. Cyclic voltammetry was used for the assessment of the electrochemical properties of modified glassy carbon electrodes. It was concluded that there is critical fluence range (2 x 10(17)-5 x 10(17) ion cm(-2)) inside of which significant changes of glassy carbon properties occur.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Carbon",
title = "Modification of glassy carbon properties under low energy proton irradiation",
pages = "3746-3737",
number = "12",
volume = "49",
doi = "10.1016/j.carbon.2011.05.006"
}

Jovanovic, Z., Kalijadis, A., Vasiljević-Radović, D., Eric, M., Lausevic, M., Mentus, S.,& Laušević, Z.. (2011). Modification of glassy carbon properties under low energy proton irradiation. in Carbon
Oxford : Pergamon-Elsevier Science Ltd., 49(12), 3737-3746.
https://doi.org/10.1016/j.carbon.2011.05.006

Jovanovic Z, Kalijadis A, Vasiljević-Radović D, Eric M, Lausevic M, Mentus S, Laušević Z. Modification of glassy carbon properties under low energy proton irradiation. in Carbon. 2011;49(12):3737-3746.
doi:10.1016/j.carbon.2011.05.006 .

Jovanovic, Zoran, Kalijadis, Ana, Vasiljević-Radović, Dana, Eric, Marko, Lausevic, Mila, Mentus, Slavko, Laušević, Zoran, "Modification of glassy carbon properties under low energy proton irradiation" in Carbon, 49, no. 12 (2011):3737-3746,
https://doi.org/10.1016/j.carbon.2011.05.006 . .