synthesis and characterization of hydrophobic silica aerogel by two step(acid-base) sol-gel process
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abstract
the silica aerogel was prepared by the acid–base sol–gel polymerization of tetraethylorthosilicate precursor followed by ambient pressure drying. the prepared silica aerogels were characterized by fourier transform infrared )ft-ir(, thermo-gravimetric and differential thermal analysis )tg/dta(, x-ray diffractometer )xrd(, energy dispersive x-ray microanalysis )edx(, brunauer–emmitt–teller (bet) and scanning electron microscopy (sem). the result silica aerogel is a light and crack-free solid with very low bulk density 0.027 g /cm3, high specific surface area 655.58 m2/ g and large pore volume 0.4831 cm3/ g. the average size of particles was calculated using a microstructure measurement program and minitab statistical software.
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Journal title:
journal of nanostructuresPublisher: university of kashan
ISSN 2251-7871
volume 3
issue 2 2013
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