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Synthesis of porosity controlled ceramic membranes

Published online by Cambridge University Press:  31 January 2011

Qunyin Xu  and
Marc A. Anderson
Qunyin Xu
Affiliation:
Water Chemistry Program, University of Wisconsin, 660 North Park Street, Madison, Wisconsin 53706
Marc A. Anderson
Affiliation:
Water Chemistry Program, University of Wisconsin, 660 North Park Street, Madison, Wisconsin 53706
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Abstract

Porosity control in ceramic membranes has been achieved by controlling particle packing densities in sol-gel processing. TiO2 xerogels with two mean pore radii of 0.7 and 1.7 nm and a porosity varying from 30% to 52% have been obtained. ZrO2 xerogels with a mean pore radius of 0.7 nm and a porosity varying from 7% to 34% have also been prepared. The principle of controlling porosity is to make spongy aggregates and to control the degree of aggregation. Experiments have been conducted to show that spongy aggregates can be produced by gradually removing protons from the strongly charged particles. Viscosity techniques have been used to measure the relative volume fraction of the dispersed phase which, in turn, provides information on aggregate structures. Two aggregation models have been proposed to explain different structural aggregates formed through thermal destabilization in the highly charged system and through charge neutralization by gradually removing charge from the particles in the system.

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Articles
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Journal of Materials Research , Volume 6 , Issue 5 , May 1991 , pp. 1073 - 1081
Copyright
Copyright © Materials Research Society 1991

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