Method for making fine and ultrafine spherical particles of zirconium titanate and other mixed metal oxide systems
First Claim
1. A method for making amorphous spherical particles of zirconium titanate having tailored intraparticle nanostructures comprising the steps of:
- a) preparing an aqueous solution of a zirconium salt;
b) preparing an aqueous solution of a titanium salt;
c) mixing said solution of zirconium salt with said solution of titanium salt into a mixed salt solution wherein said mixed salt solution has about equal moles of zirconium and titanium and wherein said mixed salt solution has a total salt concentration in the range from 0.01 M to about 0.5 M;
d) adding a stearic dispersant and an organic solvent to said mixed salt solution, subjecting said zirconium salt and said titanium salt in said mixed salt solution to a coprecipitation reaction to form a liquid solution containing amorphous spherical particles of zirconium titanate having tailored intraparticle nanostructures wherein the volume ratio of said organic solvent to aqueous part is in the range from 1 to 5.
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Abstract
Disclosed is a method for making amorphous spherical particles of zirconium titanate and crystalline spherical particles of zirconium titanate comprising the steps of mixing an aqueous solution of zirconium salt and an aqueous solution of titanium salt into a mixed solution having equal moles of zirconium and titanium and having a total salt concentration in the range from 0.01 M to about 0.5 M. A stearic dispersant and an organic solvent is added to the mixed salt solution, subjecting the zirconium salt and the titanium salt in the mixed solution to a coprecipitation reaction forming a solution containing amorphous spherical particles of zirconium titanate wherein the volume ratio of the organic solvent to aqueous part is in the range from 1 to 5. The solution of amorphous spherical particles is incubated in an oven at a temperature ≦100° C. for a period of time ≦24 hours converting the amorphous particles to fine or ultrafine crystalline spherical particles of zirconium titanate.
15 Citations
11 Claims
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1. A method for making amorphous spherical particles of zirconium titanate having tailored intraparticle nanostructures comprising the steps of:
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a) preparing an aqueous solution of a zirconium salt;
b) preparing an aqueous solution of a titanium salt;
c) mixing said solution of zirconium salt with said solution of titanium salt into a mixed salt solution wherein said mixed salt solution has about equal moles of zirconium and titanium and wherein said mixed salt solution has a total salt concentration in the range from 0.01 M to about 0.5 M;
d) adding a stearic dispersant and an organic solvent to said mixed salt solution, subjecting said zirconium salt and said titanium salt in said mixed salt solution to a coprecipitation reaction to form a liquid solution containing amorphous spherical particles of zirconium titanate having tailored intraparticle nanostructures wherein the volume ratio of said organic solvent to aqueous part is in the range from 1 to 5. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification