Thermodynamic parameters (densities, viscosities, speed of sound, and refractive index) of four series of alkaline activators were determined over the temperature range from 15 to 60 degrees C for the process of geopolymerization. Mixtures of Na2SiO3 and NaOH of different molar concentrations ( from 2M to 8M with step 2) were used as an alkaline activator. The sample with the highest NaOH concentration also shows the highest values of all thermodynamic parameters. Metakaolin, obtained by calcination of kaolin at 750 degrees C, was used as the starting material. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process, the changes in the phonon spectrum were confirmed. The different concentrations of activators do not notably change the Si/Al ratio.
Keywords:
geopolymer / density / viscosity / speed of sound / refractive index / FTIR / Raman spectroscopy
Source:
Macedonian Journal of Chemistry and Chemical Engineering, 2021, 40, 1, 107-117
TY - JOUR
AU - Ivanovic, Marija
AU - Nenadovic, Snezana
AU - Pavlovic, Vera P.
AU - Radović, Ivona
AU - Kijevčanin, Mirjana
AU - Pavlović, Vladimir B.
AU - Kljajevic, Ljiljana
PY - 2021
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4869
AB - Thermodynamic parameters (densities, viscosities, speed of sound, and refractive index) of four series of alkaline activators were determined over the temperature range from 15 to 60 degrees C for the process of geopolymerization. Mixtures of Na2SiO3 and NaOH of different molar concentrations ( from 2M to 8M with step 2) were used as an alkaline activator. The sample with the highest NaOH concentration also shows the highest values of all thermodynamic parameters. Metakaolin, obtained by calcination of kaolin at 750 degrees C, was used as the starting material. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process, the changes in the phonon spectrum were confirmed. The different concentrations of activators do not notably change the Si/Al ratio.
T2 - Macedonian Journal of Chemistry and Chemical Engineering
T1 - The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers
EP - 117
IS - 1
SP - 107
VL - 40
DO - 10.20450/mjcce.2021.2127
ER -
@article{
author = "Ivanovic, Marija and Nenadovic, Snezana and Pavlovic, Vera P. and Radović, Ivona and Kijevčanin, Mirjana and Pavlović, Vladimir B. and Kljajevic, Ljiljana",
year = "2021",
abstract = "Thermodynamic parameters (densities, viscosities, speed of sound, and refractive index) of four series of alkaline activators were determined over the temperature range from 15 to 60 degrees C for the process of geopolymerization. Mixtures of Na2SiO3 and NaOH of different molar concentrations ( from 2M to 8M with step 2) were used as an alkaline activator. The sample with the highest NaOH concentration also shows the highest values of all thermodynamic parameters. Metakaolin, obtained by calcination of kaolin at 750 degrees C, was used as the starting material. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process, the changes in the phonon spectrum were confirmed. The different concentrations of activators do not notably change the Si/Al ratio.",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers",
pages = "117-107",
number = "1",
volume = "40",
doi = "10.20450/mjcce.2021.2127"
}
Ivanovic, M., Nenadovic, S., Pavlovic, V. P., Radović, I., Kijevčanin, M., Pavlović, V. B.,& Kljajevic, L.. (2021). The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers. in Macedonian Journal of Chemistry and Chemical Engineering, 40(1), 107-117.
https://doi.org/10.20450/mjcce.2021.2127
Ivanovic M, Nenadovic S, Pavlovic VP, Radović I, Kijevčanin M, Pavlović VB, Kljajevic L. The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers. in Macedonian Journal of Chemistry and Chemical Engineering. 2021;40(1):107-117.
doi:10.20450/mjcce.2021.2127 .
Ivanovic, Marija, Nenadovic, Snezana, Pavlovic, Vera P., Radović, Ivona, Kijevčanin, Mirjana, Pavlović, Vladimir B., Kljajevic, Ljiljana, "The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers" in Macedonian Journal of Chemistry and Chemical Engineering, 40, no. 1 (2021):107-117,
https://doi.org/10.20450/mjcce.2021.2127 . .
