×

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

  • US 6,001,326 A
  • Filed: 09/28/1998
  • Issued: 12/14/1999
  • Est. Priority Date: 07/16/1998
  • Status: Expired due to Term
First Claim
Patent Images

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.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×