TY  - JOUR
AU  - Kljajević, Ljiljana M.
AU  - Melichova, Z.
AU  - Stojmenović, M.D.
AU  - Todorović, B.Z.
AU  - Pavlović, Vladimir
AU  - Čitaković, N.M.
AU  - Nenadović, Snežana S.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5148
AB  - Geopolymers (GP) were successfully synthesized from metabentonite (MB), metadiatomite (MD) and metakaolinite (MK). Characterization of their phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. A SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel, and it is significantly different from the micrographs of the other two geopolymer samples, GPMB and GPMK. A considerable amount of unreacted particles, as well as the presence of pores in the geopolymer matrix of GPMK and GPMD, indicate an incomplete reaction in the system. Aluminosilicate inorganic polymers, geopolymers, are quasi solid electrolytes which possess a high electrical conductivity at room temperature in relation to materials of similar chemical composi-tion. The highest conductivity was found for the sample obtained from GPMK, amounting to 2.14 x 10-2 Ω-1cm-1 at 700 oC. The corresponding activation energies of conductivity for this sample amounted to 0.33 eV in the temperature range of 500-700 oC. The geopolymer synthesized from metakaolin has good ionic conductivity values, which recommends it for use as an alternative material for an SOFC (Solid Ox-ide Fuel Cell).
PB  - Macedonian Journal of Chemistry and Chemical Engineering
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite)
EP  - 292
IS  - 2
SP  - 283
VL  - 38
DO  - 10.20450/mjcce.2019.1678
ER  - 

@article{
author = "Kljajević, Ljiljana M. and Melichova, Z. and Stojmenović, M.D. and Todorović, B.Z. and Pavlović, Vladimir and Čitaković, N.M. and Nenadović, Snežana S.",
year = "2019",
abstract = "Geopolymers (GP) were successfully synthesized from metabentonite (MB), metadiatomite (MD) and metakaolinite (MK). Characterization of their phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. A SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel, and it is significantly different from the micrographs of the other two geopolymer samples, GPMB and GPMK. A considerable amount of unreacted particles, as well as the presence of pores in the geopolymer matrix of GPMK and GPMD, indicate an incomplete reaction in the system. Aluminosilicate inorganic polymers, geopolymers, are quasi solid electrolytes which possess a high electrical conductivity at room temperature in relation to materials of similar chemical composi-tion. The highest conductivity was found for the sample obtained from GPMK, amounting to 2.14 x 10-2 Ω-1cm-1 at 700 oC. The corresponding activation energies of conductivity for this sample amounted to 0.33 eV in the temperature range of 500-700 oC. The geopolymer synthesized from metakaolin has good ionic conductivity values, which recommends it for use as an alternative material for an SOFC (Solid Ox-ide Fuel Cell).",
publisher = "Macedonian Journal of Chemistry and Chemical Engineering",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite)",
pages = "292-283",
number = "2",
volume = "38",
doi = "10.20450/mjcce.2019.1678"
}

Kljajević, L. M., Melichova, Z., Stojmenović, M.D., Todorović, B.Z., Pavlović, V., Čitaković, N.M.,& Nenadović, S. S.. (2019). Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite). in Macedonian Journal of Chemistry and Chemical Engineering
Macedonian Journal of Chemistry and Chemical Engineering., 38(2), 283-292.
https://doi.org/10.20450/mjcce.2019.1678

Kljajević LM, Melichova Z, Stojmenović M, Todorović B, Pavlović V, Čitaković N, Nenadović SS. Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite). in Macedonian Journal of Chemistry and Chemical Engineering. 2019;38(2):283-292.
doi:10.20450/mjcce.2019.1678 .

Kljajević, Ljiljana M., Melichova, Z., Stojmenović, M.D., Todorović, B.Z., Pavlović, Vladimir, Čitaković, N.M., Nenadović, Snežana S., "Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite)" in Macedonian Journal of Chemistry and Chemical Engineering, 38, no. 2 (2019):283-292,
https://doi.org/10.20450/mjcce.2019.1678 . .

TY  - JOUR
AU  - Kljajević, Ljiljana M.
AU  - Melichova, Z.
AU  - Kisić, D.D.
AU  - Nenadović, Miloš
AU  - Todorović, B.Ž.
AU  - Pavlović, Vladimir
AU  - Nenadović, Snežana S.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5132
AB  - The purpose of this investigation is to investigate the hydrophobicity of geopolymers, new alumino-silicate materials and the influence of Si/Al ratio on their surface properties. Contact angle measurement (CAM) as reliable indicator of hydrophobicity was determined for synthesized geopolymers using water and ethylene-glycol as reference liquids. Geopolymers were synthesized from various precursors: Kaolin, bentonite and diatomite. Characterization of phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. Contact angle measurements confirmed that the geopolymers synthesized from metakaolin are the most porous, which can be explained by the smallest Si/Al ratio. The maximum value of contact angle and free surface energy (110.2 mJ/m2) has been achieved for geopolymer synthesized by diatoms (GPMD). SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel and is significantly different from the micrographs of other two geopolymer samples, GPMB and GPMK.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - The influence of alumino-silicate matrix composition on surface hydrophobic properties
EP  - 10
IS  - 2
SP  - 1
VL  - 51
DO  - 10.2298/sos1902163k
ER  - 

@article{
author = "Kljajević, Ljiljana M. and Melichova, Z. and Kisić, D.D. and Nenadović, Miloš and Todorović, B.Ž. and Pavlović, Vladimir and Nenadović, Snežana S.",
year = "2019",
abstract = "The purpose of this investigation is to investigate the hydrophobicity of geopolymers, new alumino-silicate materials and the influence of Si/Al ratio on their surface properties. Contact angle measurement (CAM) as reliable indicator of hydrophobicity was determined for synthesized geopolymers using water and ethylene-glycol as reference liquids. Geopolymers were synthesized from various precursors: Kaolin, bentonite and diatomite. Characterization of phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. Contact angle measurements confirmed that the geopolymers synthesized from metakaolin are the most porous, which can be explained by the smallest Si/Al ratio. The maximum value of contact angle and free surface energy (110.2 mJ/m2) has been achieved for geopolymer synthesized by diatoms (GPMD). SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel and is significantly different from the micrographs of other two geopolymer samples, GPMB and GPMK.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "The influence of alumino-silicate matrix composition on surface hydrophobic properties",
pages = "10-1",
number = "2",
volume = "51",
doi = "10.2298/sos1902163k"
}

Kljajević, L. M., Melichova, Z., Kisić, D.D., Nenadović, M., Todorović, B.Ž., Pavlović, V.,& Nenadović, S. S.. (2019). The influence of alumino-silicate matrix composition on surface hydrophobic properties. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 51(2), 1-10.
https://doi.org/10.2298/sos1902163k

Kljajević LM, Melichova Z, Kisić D, Nenadović M, Todorović B, Pavlović V, Nenadović SS. The influence of alumino-silicate matrix composition on surface hydrophobic properties. in Science of Sintering. 2019;51(2):1-10.
doi:10.2298/sos1902163k .

Kljajević, Ljiljana M., Melichova, Z., Kisić, D.D., Nenadović, Miloš, Todorović, B.Ž., Pavlović, Vladimir, Nenadović, Snežana S., "The influence of alumino-silicate matrix composition on surface hydrophobic properties" in Science of Sintering, 51, no. 2 (2019):1-10,
https://doi.org/10.2298/sos1902163k . .