Journal article
COMPETING DRYING AND REACTION MECHANISMS IN THE FORMATION OF SOL-TO-GEL FILMS, FIBRES, AND SPHERES
Drying Technol, Vol.10(4), pp.893-923
01 Jan 1992
Abstract
The drying of films, fibres and spheres during the sol to gel transformation is affected by the dependence of the diffusion coefficients on composition, molecular weight and temperature. The dependence can be evaluated by solving the equations of mass and heat transfer by diffusion, conduction and convection, in association with chemical reaction. A one-dimensional analysis is used, with a method based on finite element analysis. Skinning and solidification in silica sol-gel systems are considered, and the kinetics of silica reactions modelled. Gelation is predicted using a recursive technique. Gelation proceeds from the surface inwards, and occurs before or after drying, depending upon the rate of reaction. The derived results can be used to predict the conditions necessary for the formation of uniform films, fibres and microspheres. 40 refs.
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Details
- Title
- COMPETING DRYING AND REACTION MECHANISMS IN THE FORMATION OF SOL-TO-GEL FILMS, FIBRES, AND SPHERES
- Creators
- R CairncrossL FrancisL Scriven
- Publication Details
- Drying Technol, Vol.10(4), pp.893-923
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Identifiers
- 991019295185604721