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US 4,801,399 AGranted
Inorganic salts as peptizing agents in the preparation of metal oxide sol-gel compositions
AssigneeUniversity of Florida
InventorsDavid E. Clark, William J. Dalzell, Jr., Brenda L. Adams
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Abstract
A novel method for preparing sols from metal oxide precursors by using inorganic salts as the peptizing agent is disclosed herein. Sol-gels prepared from the sols are also disclosed. Ceramic coatings, monoliths, bodies and are formed. These structures have a particle size of down to 0.0001 micron and are endowed with excellent packing characteristics as well as smoothness.
Claims9
A method of preparing a metal oxide sol, said method comprising the steps of:
- hydrolyzing and peptizing a metal alkoxide in the presence of an excess of aqueous medium and in the presence of a metal nitrate used as a peptizing agent, said metal alkoxide, said medium and said nitrate being present in a proportion, and said hydrolysis and said peptizing being conducted at a temperature and for a time effective to obtain a sol whose colloids have a particle size of up to and including 10 microns.
Dependencies are inferred from the claim text.