Patent ID: 6806295
Filing Date: 2004-10-19
Classification: B01J

Abstract:
A method of sol-gel processing using an inorganic metal salt and a mixed solvent system, comprising:preparing a solution including an inorganic metal salt, water, and an organic solvent having a metal salt concentration and a volume ratio of organic solvent to water, wherein the inorganic metal salt contains a metal selected from the group consisting of aluminum, hafnium, silicon, zirconium, lanthanum, germanium, tantalum, combinations thereof, and combinations thereof with titanium; adding a dispersant to the solution; and incubating the solution at a temperature from about 20Â° C. to about 25Â° C. for a period of time; wherein the metal salt concentration, volume ratio of organic solvent to water, temperature, and time are selected to provide a sol or a gel having desired characteristics; wherein the sol or the gel is capable of forming a coating; wherein the volume ratio of organic solvent to water ranges from about 1/1 to 10/1; wherein nanosized particles are produced; and, wherein the time ranges from about one minute to about 72 hours.