Formulation and method for preparing gels comprising hydrous hafnium oxide
OwnerJack L. Collins, Rodney D. Hunt +1inventors
InventorsJack L. Collins, Rodney D. Hunt, Frederick C. Montgomery
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Abstract
Formulations useful for preparing hydrous hafnium oxide gels contain a metal salt including hafnium, an acid, an organic base, and a complexing agent. Methods for preparing gels containing hydrous hafnium oxide include heating a formulation to a temperature sufficient to induce gel formation, where the formulation contains a metal salt including hafnium, an acid, an organic base, and a complexing agent.
Claims19
A formulation for preparing gels, the formulation consisting essentially of:
- a hafnium metal salt;
- a source of hydrogen ions, the source being hydrochloric acid;
- hexamethylenetetramine as an organic base;
- and
- a complexing agent, the complexing agent being urea;
- wherein a mole ratio of the organic base to the hafnium ranges from about 1.2 to about 3.
A formulation for preparing gels, the formulation consisting essentially of:
- a hafnium metal salt;
- a source of hydrogen ions, the source being hydrochloric acid;
- hexamethylenetetramine as an organic base;
- and
- a complexing agent, the complexing agent being urea;
- wherein a concentration of the hafnium ranges from about 0.4 M to about 0.8 M.
A method of preparing gels comprising hydrous hafnium oxide, the method comprising heating a volume of a formulation to a temperature sufficient to induce gel formation, wherein the formulation consists essentially of:
- a hafnium metal salt;
- a source of hydrogen ions, the source being hydrochloric acid;
- hexamethylenetetramine as an organic base;
- and
- a complexing agent, the complexing agent being urea;
- wherein a mole ratio of the organic base to the hafnium ranges from about 1.2 to about 3.
Dependencies are inferred from the claim text.