Abstract
Thermal stability of geopolymers synthesized with fly ash, metakaolin as aluminosilicate sources was investigated in order to explore the feasibility of using geopolymers as supports for nano-titanium dioxide film coating via sol-gel process. Structural and compositional changes of geopolymers heated up to 800°C were examined by X-ray diffraction, Fourier transform infrared spectroscopy, mercury intrusion porosimetry and thermogravimetric analysis. Below 800°C, the loss of water is the main cause for the strength degradation and thermal shrinkage of geopolymers. Geopolymers synthesized with appropriate fly ash content possess good thermal stability because of high permeability arising from low reactivity of fly ash, filler effect provided by unreacted fly ash particles and original occurring minerals as quartz, mullite and hematite. TiO2 films were coated onto geopolymer derived from fly ash containing sources via sol-gel process. The grazing-incidence X-ray diffraction patterns of the films calcined at different temperatures show that anatase crystalizes well at 600°C. The study reveals the feasibility of using geopolymers with improved thermal stability as supports for TiO2 film coating via sol-gel process.
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