Chemical modification of silica gels

Chemical modification of silica gels

Highly porous pure and polyethyleneglycol (PEG)-doped silica gels have been prepared from tetraethyl orthosilicate (TEOS) in ethanol using NH4OH base-catalysis. Addition of PEG to the SiO2-systemincreases the average particle size and most frequent pore diameter of the resultant gels while their tot...

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Veröffentlicht in:Journal of sol-gel science and technology 1997-02, Vol.8 (1-3), p.499-505
Hauptverfasser: Vong, M. S. W., Bazin, N., Sermon, P. A.
Format: Artikel
Sprache:eng
Schlagworte:
Ammonium hydroxide
Catalysis
Ethanol
Hydrogen bonding
Organic chemistry
Silica gel
Silicon dioxide
Tetraethyl orthosilicate
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container_issue 1-3
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container_title Journal of sol-gel science and technology
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creator Vong, M. S. W.
Bazin, N.
Sermon, P. A.
description Highly porous pure and polyethyleneglycol (PEG)-doped silica gels have been prepared from tetraethyl orthosilicate (TEOS) in ethanol using NH4OH base-catalysis. Addition of PEG to the SiO2-systemincreases the average particle size and most frequent pore diameter of the resultant gels while their total surface areadecreases. The viscosity of the solincreases with PEG concentration and passes through a maximum with increasing molecular weight at PEG 200. Results obtained indicate a definite interaction of the polymer with SiO2 and that this interaction is not as a result of direct formation of Si−O−C linkage, but is more likely to be, due to hydrogen bonding between the hydrated PEG and the Si−O−Si network. Structure-process correlations are considered.
doi_str_mv 10.1007/BF02436889
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subjects Ammonium hydroxide
Catalysis
Ethanol
Hydrogen bonding
Organic chemistry
Silica gel
Silicon dioxide
Tetraethyl orthosilicate
title Chemical modification of silica gels
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