TY  - JOUR
AU  - Saponjic, Aleksandra
AU  - Gyoshev, Stanislav
AU  - Baščarević, Zvezdana
AU  - Jankovic Mandic, Ljiljana
AU  - Ljubenov, Gorica
AU  - Kokunesoski, Maja
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1555
AB  - Diatomite (diatomaceous earth) and clay minerals deposits from the mining basin Kolubara, Serbia, are natural materials with high economic potential in many fields. As received and treated materials, diatomite and clay were characterized using X-ray diffraction, mercury intrusion porosimetry, particle size distribution, scanning electron microscopy, and Fourier-transform infrared spectroscopy. Activity concentrations for natural radionuclides 40K, 226Ra and 232Th and anthropogenic radionuclide 137Cs in diatomite and clay were determined by gamma spectrometry with HPGe detector. For diatomite and clay, the mean activity concentrations of 226Ra, 232Th and 40K were found to be 9, 26 and 173 Bq kg-1 and 19, 26 and 470 Bq kg-1, respectively. In the present study was to show that these materials are environmentally safe for further use in many fields.
PB  - International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Characterization of Sedimentary Minerals from Kolubara Mining Basin, Serbia, with the Determination of Natural Radioactivity
EP  - 48
SP  - 39
VL  - 54
DO  - 10.2298/SOS2201039S
ER  - 

@article{
author = "Saponjic, Aleksandra and Gyoshev, Stanislav and Baščarević, Zvezdana and Jankovic Mandic, Ljiljana and Ljubenov, Gorica and Kokunesoski, Maja",
year = "2022",
abstract = "Diatomite (diatomaceous earth) and clay minerals deposits from the mining basin Kolubara, Serbia, are natural materials with high economic potential in many fields. As received and treated materials, diatomite and clay were characterized using X-ray diffraction, mercury intrusion porosimetry, particle size distribution, scanning electron microscopy, and Fourier-transform infrared spectroscopy. Activity concentrations for natural radionuclides 40K, 226Ra and 232Th and anthropogenic radionuclide 137Cs in diatomite and clay were determined by gamma spectrometry with HPGe detector. For diatomite and clay, the mean activity concentrations of 226Ra, 232Th and 40K were found to be 9, 26 and 173 Bq kg-1 and 19, 26 and 470 Bq kg-1, respectively. In the present study was to show that these materials are environmentally safe for further use in many fields.",
publisher = "International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Characterization of Sedimentary Minerals from Kolubara Mining Basin, Serbia, with the Determination of Natural Radioactivity",
pages = "48-39",
volume = "54",
doi = "10.2298/SOS2201039S"
}

Saponjic, A., Gyoshev, S., Baščarević, Z., Jankovic Mandic, L., Ljubenov, G.,& Kokunesoski, M.. (2022). Characterization of Sedimentary Minerals from Kolubara Mining Basin, Serbia, with the Determination of Natural Radioactivity. in Science of Sintering
International Institute for the Science of Sintering., 54, 39-48.
https://doi.org/10.2298/SOS2201039S

Saponjic A, Gyoshev S, Baščarević Z, Jankovic Mandic L, Ljubenov G, Kokunesoski M. Characterization of Sedimentary Minerals from Kolubara Mining Basin, Serbia, with the Determination of Natural Radioactivity. in Science of Sintering. 2022;54:39-48.
doi:10.2298/SOS2201039S .

Saponjic, Aleksandra, Gyoshev, Stanislav, Baščarević, Zvezdana, Jankovic Mandic, Ljiljana, Ljubenov, Gorica, Kokunesoski, Maja, "Characterization of Sedimentary Minerals from Kolubara Mining Basin, Serbia, with the Determination of Natural Radioactivity" in Science of Sintering, 54 (2022):39-48,
https://doi.org/10.2298/SOS2201039S . .

TY  - JOUR
AU  - Kokunesoski, Maja
AU  - Baščarević, Zvezdana
AU  - Rakocević, Zlatko
AU  - Šaponjić, Aleksandra
AU  - Saponjic, Đorđe
AU  - Jordanov, Dragana
AU  - Babić, Biljana M.
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1130
AB  - Mesoporous silica SBA-15 materials of high specific surface area (similar to 700 m(2) g(-1)) were synthesized by using block copolymer Pluronic P123 as template and tetraethoxysilane as silica source. The obtained materials were characterized by XRD, nitrogen adsorption desorption measurements, SEM, EDS and AFM analysis. It was found that small modifications of synthesis conditions influenced the morphological features of the synthesized SBA-15 samples. The SEM analysis had shown that the SBA-15 synthesized at lower temperature and longer time of reaction (80 degrees C, 48 h) provided elongated rod-shaped grains about 1 mu m long. The other sample synthesized at higher temperature and shorter time of reaction (100 degrees C, 24 h) had rounded grains and grains of regular spherical shape with diameters ranging from 0.5 to 2 mu m. The EDS analysis confirmed that the particles of both synthesized samples were of the SiO2 content. In addition, the AFM analysis had shown different surface morphologies of the materials synthesized under various conditions.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Influence of Synthesis Conditions on Morphological Features of the SBA-15 Containing Only Elongated and Rounded/Spherical Grains
EP  - 121
IS  - 1
SP  - 111
VL  - 50
DO  - 10.2298/SOS1801111K
ER  - 

@article{
author = "Kokunesoski, Maja and Baščarević, Zvezdana and Rakocević, Zlatko and Šaponjić, Aleksandra and Saponjic, Đorđe and Jordanov, Dragana and Babić, Biljana M.",
year = "2018",
abstract = "Mesoporous silica SBA-15 materials of high specific surface area (similar to 700 m(2) g(-1)) were synthesized by using block copolymer Pluronic P123 as template and tetraethoxysilane as silica source. The obtained materials were characterized by XRD, nitrogen adsorption desorption measurements, SEM, EDS and AFM analysis. It was found that small modifications of synthesis conditions influenced the morphological features of the synthesized SBA-15 samples. The SEM analysis had shown that the SBA-15 synthesized at lower temperature and longer time of reaction (80 degrees C, 48 h) provided elongated rod-shaped grains about 1 mu m long. The other sample synthesized at higher temperature and shorter time of reaction (100 degrees C, 24 h) had rounded grains and grains of regular spherical shape with diameters ranging from 0.5 to 2 mu m. The EDS analysis confirmed that the particles of both synthesized samples were of the SiO2 content. In addition, the AFM analysis had shown different surface morphologies of the materials synthesized under various conditions.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Influence of Synthesis Conditions on Morphological Features of the SBA-15 Containing Only Elongated and Rounded/Spherical Grains",
pages = "121-111",
number = "1",
volume = "50",
doi = "10.2298/SOS1801111K"
}

Kokunesoski, M., Baščarević, Z., Rakocević, Z., Šaponjić, A., Saponjic, Đ., Jordanov, D.,& Babić, B. M.. (2018). Influence of Synthesis Conditions on Morphological Features of the SBA-15 Containing Only Elongated and Rounded/Spherical Grains. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 50(1), 111-121.
https://doi.org/10.2298/SOS1801111K

Kokunesoski M, Baščarević Z, Rakocević Z, Šaponjić A, Saponjic Đ, Jordanov D, Babić BM. Influence of Synthesis Conditions on Morphological Features of the SBA-15 Containing Only Elongated and Rounded/Spherical Grains. in Science of Sintering. 2018;50(1):111-121.
doi:10.2298/SOS1801111K .

Kokunesoski, Maja, Baščarević, Zvezdana, Rakocević, Zlatko, Šaponjić, Aleksandra, Saponjic, Đorđe, Jordanov, Dragana, Babić, Biljana M., "Influence of Synthesis Conditions on Morphological Features of the SBA-15 Containing Only Elongated and Rounded/Spherical Grains" in Science of Sintering, 50, no. 1 (2018):111-121,
https://doi.org/10.2298/SOS1801111K . .