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US 5,194,200 AGranted
Method of creating silica ceramic membranes
AssigneeWisconsin Alumni Research Foundation
InventorsMarc A. Anderson, Lixin Chu
Life of this patent
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Abstract
A method of creating a silica ceramic membrane is disclosed. The method begins with the hydrolyzing of a silicon alkoxide with ammonia until the sol is formed. The sol is dialyzed to approximately pH 8 and then acidified to approximately pH 3. The sol is then formed into a membrane by controlled evaporation followed by sintering.
Claims21
A method comprising creating a ceramic silica membrane with a range of porosity as low as less than 20 Angstroms by:
- (a) hydrolyzing a silicon alkoxide with ammonia until a sol is formed;
- (b) dialyzing the sol to a basic solution;
- (c) acidifying the sol to below a pH of 7
- (d) forming a xerogel by solvent evaporation in a controlled humidity environment;
- and
- (e) sintering the xerogel until a membrane is formed.
3 more elements
A method comprising creating a ceramic silica membrane with a range of porosity as low as less than 20 Angstroms by:
- (a) hydrolyzing a silicon alkoxide with ammonia until a sol is formed;
- (b) dialyzing the sol to a basic pH;
- (c) acidifying the sol to a pH less than 7;
- (d) coating the sol onto a solid support;
- and
- (e) allowing the sol to evaporate until a membrane is framed.
3 more elements
Dependencies are inferred from the claim text.