Metal oxide nanoparticles, methods of making, and methods of use
First Claim
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1. A method of making metal oxide nanoparticles, comprising:
- hydrolyzing metal alkoxide with an acidic alcohol solution, wherein the acidic alcohol solution comprises an alkyl alcohol, water, and an acid to form a first sol comprising metal oxide nanoparticles;
treating the first sol with an organosilane to form a second sol comprising treated metal oxide nanoparticles; and
treating the second sol with an organic base in an amount of about 0.1;
1 to about 0.9;
1 molar ratio of organic base to acid to form a third sol comprising treated metal oxide nanoparticles.
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Abstract
Disclosed is a method of preparing treated metal oxide nanoparticles from sols prepared from metal alkoxides and organosilanes. The treated nanoparticles are useful high refractive index additives in the manufacture of optical articles.
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Citations
19 Claims
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1. A method of making metal oxide nanoparticles, comprising:
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hydrolyzing metal alkoxide with an acidic alcohol solution, wherein the acidic alcohol solution comprises an alkyl alcohol, water, and an acid to form a first sol comprising metal oxide nanoparticles;
treating the first sol with an organosilane to form a second sol comprising treated metal oxide nanoparticles; and
treating the second sol with an organic base in an amount of about 0.1;
1 to about 0.9;
1 molar ratio of organic base to acid to form a third sol comprising treated metal oxide nanoparticles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of making titanium oxide nanoparticles, comprising:
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hydrolyzing titanium tetraalkoxide with an acidic alcohol solution to form a first sol comprising titanium oxide nanoparticles, wherein the acidic alcohol solution comprises an alkyl alcohol, water in an amount of about 0.1;
1 to about 5;
1 molar ratio of water to titanium tetraalkoxide, andan acid in an amount of about 0.1;
1 to about 2;
1 molar ratio of acid to titanium tetraalkoxide;
treating the first sol with an organosilane to form a second sol comprising treated titanium oxide nanoparticles; and
treating the second sol with an organic base in an amount of about 0.1;
1 to about 0.9;
1 molar ratio of organic base to acid to form a third sol comprising treated titanium oxide nanoparticles. - View Dependent Claims (16, 17, 18)
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19. A composition, comprising:
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a polymerizable compound; and
treated titanium oxide nanoparticles, wherein the treated titanium oxide nanoparticles are prepared by hydrolyzing titanium tetraalkoxide with an acidic alcohol solution to form a first sol, wherein the acidic alcohol solution comprises an alkyl alcohol, water in an amount of about 0.1;
1 to about 5;
1 molar ratio of water to titanium tetraalkoxide, andan acid in an amount of about 0.1;
1 to about 2;
1 molar ratio of acid to titanium tetraalkoxide;
treating the first sol with an organosilane to form a second sol; and
treating the second sol with an organic base in an amount of about 0.1;
1 to about 0.9;
1 molar ratio of organic base to acid to form a third sol comprising treated titanium oxide nanoparticles.
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Specification