Other

Korea Atomic Energy Research Institute

Korea Electric Power Corporation

Sun-Jae Kim

Yong Hwan Jeong

Il Hiun Kuk

Kyeong Ho Kim

Soon Dong Park

Youn Ho Jung

Jong Hyuk Baek

Seok-Jin Oh

Byong Kwon Choi

Il-Hyun Kuk

Whung Whoe Kim

Choong-Hwan Jung

Chang Kyu Rhee

Thae-Khapp Kang

The present invention relates to titanium dioxide powder with a large specific surface area, a method for preparing thereof, and a use of the titanium dioxide as a photocatalyst, and more particularly, discloses a method for the preparation of titanium dioxide powder comprised of the steps of adding ice pieces or icy distilled water to pure titanium tetrachloride (TiCl ) to give an aqueous titanylchloride solution of 1.5 M or higher; diluting the aqueous titanylchloride with distilled water; obtaining precipitates from the diluted aqueous titanylchloride solution by standing for 2-20 hours at 15-70&deg; C.; and filtering, washing and drying the above precipitates to give downy hair-shaped TiO powder with a specific surface area of 130-200 m /g. The titanium dioxide powder of the present invention shows high photocatalytic activity, so that it can be used to decompose environmental organic pollutants by taking advantage of an advanced oxidation process (AOP) in which pollution-free energy, such as solar energy is utilized as a driving force. The method allows the formation of a crystalline phase of titanium dioxide at room temperature without a high temperature and high pressure process and enjoys an economical advantage of being low in production cost.

TiO2 ultrafine powder, and process for preparing thereof

Zirconium alloy having high corrosion resistance and high strength

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.degree. 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.

Method for production of mono-dispersed and crystalline TiO.sub.2

The present invention provides silica balls in a spherical shape, the silica balls having a porous internal structure and a dense outside layer.

Light weight silica balls with a dense outer layer and method of making

Growing community of inventors

Daejeon-Si, South Korea

Sun-Jae Kim