Method for production of mono-dispersed and crystalline TiO.sub.2 ultrafine powders for aqueous TiOCl.sub.2 solution using homogeneous precipitation
First Claim
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1. A method for production of mono-dispersed and crystalline titanium dioxide (TiO2) ultrafine powders comprising the steps of:
- (a) preparing an aqueous titanyl chloride (TiOCl2) solution in a concentration of greater than or equal to 1.5M, by adding ice pieces of distilled water or icy distilled water to the undiluted titanium tetrachloride (TiCl4);
(b) diluting the above aqueous titanyl chloride solution to a specific concentration within the range of 0.2 to 1.2M by adding an adequate amount of distilled water;
(c) obtaining crystalline titanium dioxide, which precipitates, by heating the above diluted aqueous titanyl chloride solution and maintaining the temperature within a range of 15-155°
C.; and
(d) fabricating the mono-dispersed and crystalline titanium dioxide ultrafine powders by filtrating, washing and drying the above titanium dioxide precipitates.
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Abstract
A method for production of mono-dispersed and crystalline titanium dioxide ultra fine powders comprises preparing an aqueous titanyl chloride solution, diluting the aqueous titanyl chloride solution to a concentration of between about 0.2 to 1.2 mole and heating the diluted aqueous titanyl chloride solution and maintaining the solution in a temperature range of between 15 to 155° C. to precipitate titanium dioxide. The aqueous titanyl chloride solution is prepared by adding ice pieces of distilled water or icing distilled water to undiluted titanium tetrachloride.
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Citations
12 Claims
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1. A method for production of mono-dispersed and crystalline titanium dioxide (TiO2) ultrafine powders comprising the steps of:
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(a) preparing an aqueous titanyl chloride (TiOCl2) solution in a concentration of greater than or equal to 1.5M, by adding ice pieces of distilled water or icy distilled water to the undiluted titanium tetrachloride (TiCl4); (b) diluting the above aqueous titanyl chloride solution to a specific concentration within the range of 0.2 to 1.2M by adding an adequate amount of distilled water; (c) obtaining crystalline titanium dioxide, which precipitates, by heating the above diluted aqueous titanyl chloride solution and maintaining the temperature within a range of 15-155°
C.; and(d) fabricating the mono-dispersed and crystalline titanium dioxide ultrafine powders by filtrating, washing and drying the above titanium dioxide precipitates. - View Dependent Claims (2, 3, 4)
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5. A method for production of mono-dispersed and crystalline titanium dioxide ultrafine powders comprising the steps of:
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(a) preparing an aqueous titanyl chloride solution in a concentration of greater than or equal to 1.5M, by adding ice pieces of distilled water or icy distilled water to the undiluted titanium tetrachloride; (b) diluting the above aqueous titanyl chloride solution to a specific concentration within the range of 0.2 to 1.2M with an adequate amount of distilled water; (c) obtaining crystalline titanium dioxide, which precipitates, by heating the above diluted aqueous titanyl chloride solution and maintaining the temperature within a range of 75-155°
C. for 20 minutes to 3 hours; and(d) fabricating the mono-dispersed and crystalline titanium dioxide ultrafine powders by filtrating, washing and drying the above titanium dioxide precipitates. - View Dependent Claims (6, 7, 8)
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9. A method for production of mono-dispersed and crystalline titanium dioxide ultrafine powders comprising the steps of;
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(a) preparing an aqueous titanyl chloride solution in a concentration of greater than or equal to 1.5M, by adding ice pieces of distilled water or icy distilled water to the undiluted titanium tetrachloride; (b) diluting the above aqueous titanyl chloride solution to a specific concentration within the range of 0.2 to 1.2M with an adequate amount of distilled water; (c) obtaining crystalline titanium dioxide, which precipitates, by heating the above diluted aqueous titanyl chloride solution and maintaining the temperature within a range of 15-70°
C. for 2 to 60 hours; and(d) fabricating the mono-dispersed and crystalline titanium dioxide ultrafine powders by filtrating, washing and drying the above titanium dioxide precipitates. - View Dependent Claims (10, 11, 12)
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Specification