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Chemical modification of silica gels

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Abstract

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.

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Authors and Affiliations

  1. Fractal Solids and Surfaces Research Group, Department of Chemistry, Brunel University, UB8 3PH, Uxbridge, Middx.

    M. S. W. Vong, N. Bazin & P. A. Sermon

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  1. M. S. W. Vong
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  2. N. Bazin
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  3. P. A. Sermon
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Vong, M.S.W., Bazin, N. & Sermon, P.A. Chemical modification of silica gels. J Sol-Gel Sci Technol 8, 499–505 (1997). https://doi.org/10.1007/BF02436889

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