Surface Modification and Properties of SiO2 Nano Porous Aerogels
Surface modification is a process in which Si-CH3 groups of trimethylchlorosilane (TMCS) replace -OH groups on the inner surface of SiO2 aerogels, so the surface property of aerogels has shown hydrophobic performance which could be changed back to hydrophilic by 450 heat treatment. This aerogels wit...
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Veröffentlicht in: | Key engineering materials 2008-01, Vol.373-374, p.702-705 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Surface modification is a process in which Si-CH3 groups of trimethylchlorosilane
(TMCS) replace -OH groups on the inner surface of SiO2 aerogels, so the surface property of aerogels
has shown hydrophobic performance which could be changed back to hydrophilic by 450 heat
treatment. This aerogels with surface property controlled are prepared via sol-gel process with polyethoxydisiloxanes
(E-40) used as precursor, and have typical porous structures dried at ambient
pressure: high porosity (above 90 %), super specific surface area (about 1000 m2/g), low bulk density
(down to 3.03 kg/m3) and average pore size is about 20 nm. This paper presents adsorption mechanisms
in aerogels and illustrates that the adsorption capacity of aerogels is three or four times as much
as that of activated carbon fiber (ACF) and granule of activated carbon (GAC). So SiO2 aerogels are
potentially important to be used as absorbents being quite efficient to adsorb toxic substances. |
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ISSN: | 1013-9826 1662-9795 1662-9795 |
DOI: | 10.4028/www.scientific.net/KEM.373-374.702 |