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Light Scattering Study on Sol-Gel Transformation of SiO2 Colloid at Extremely High Concentrations

Published online by Cambridge University Press:  28 February 2024

Yingnian Xu  and
Yoshikata Koga
Yingnian Xu
Affiliation:
Department of Chemistry, The University of British Columbia, Vancouver, B.C. V6T 1Z1, Canada
Yoshikata Koga
Affiliation:
Department of Chemistry, The University of British Columbia, Vancouver, B.C. V6T 1Z1, Canada
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Abstract

Ludox SiO2 sols with a reasonably uniform size of 12 nm and in the high concentration of 10 to 40 wt% were transformed to gels by lowering the pH. The process from sol to gel, followed by light scattering, did not show a sign of fractal growth within the length scale of observation (>0 nm). Rather, a density fluctuation due to a dynamic (non-equilibrium) disorder was apparent. Together with the results of viscosity measurements, it was concluded that the process consists of 3 stages: 1) A dynamic (non-equilibrium) density fluctuation grows rapidly. 2) Such density fluctuation acquires some order. 3) The entire bulk loses fluidity and becomes a macroscopic gel.

Keywords

Light Scattering StudySiO2 ColloidsSol-gel Transformation
Type
Research Article
Information
Clays and Clay Minerals , Volume 46 , Issue 2 , April 1998 , pp. 161 - 166
Copyright
Copyright © 1998, The Clay Minerals Society

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