Method for production of mono-dispersed and crystalline TiO.sub.2 ultrafine powders for aqueous TiOCl.sub.2 solution using homogeneous precipitation

A method for production of mono-dispersed and crystalline titanium dioxide ultrafine powders comprising the steps of:

• (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.degree. 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.

A method for production of mono-dispersed and crystalline titanium dioxide ultrafine powders comprising the steps of;

• (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.degree. 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.