Showa Denko K.k.

Yasuo Saito

Kotaro Yano

Masako Tanaka

Keiji Kawasaki

Nobuaki Ishii

Shinobu Ito

Michihiro Takama

Kazuo Sekiguchi

Koichi Wada

Hironosuke Sato

An activated carbon material having a BET specific surface area of 10 to 1,000 m/g as measured by means of a nitrogen adsorption method, and the ratio of the height of the D peak (1,360 cm) of a Raman spectrum of the activated carbon material to that of the G peak (1,580 cm&#x2212;) of the Raman spectrum is 0.8 to 1.2. When the activated carbon material of the present invention is used as a polarizable electrode material of an electric double layer capacitor, high capacitance per electrode is attained without application of excessive voltage.

Activated carbon material, and production method and use thereof

A method for producing an activated carbon material, wherein the method comprises a step of thermally treating coal-based pitch at two temperature ranges of 400&#xb0; C. to 600&#xb0; C. and 600&#xb0; C. to 900&#xb0; C.; and a step of mixing the thus obtained carbonaceous material with an alkali metal compound and effecting activation thereof at 600&#xb0; C. to 900&#xb0; C., and an activated carbon material obtained by the method. When the activated carbon material of the present invention is used a polarizable electrode material of an electric double layer capacitor, high capacitance per electrode is attained without application of excessive voltage. By adding fibrous material to a coal-based pitch during activation expansion of an alkali molten liquid can be suppressed and productivity can be drastically improved. Furthermore, employment of an fibrous carbon material which is excellent in conductivity as a fibrous material, carbon fiber is melt-bonded on the surface of the activated carbon material, which enables production of a polarizable electrode exhibiting excellent charge/discharge characteristics at high current density.

Activated carbon, method for production thereof and use thereof

Cosmetics comprising silica-coated metal oxide powder having a thickness of the silica coating of 0.1 to 100 nm, and a photocatalytic activity as measured by tetralin auto-oxidation method of 6 mmH,O/min or less. Silica-coated metal oxide powder coated with a silica coating having an absorption peak intensity ratio I (I&equals;I,/I,, wherein I,is an absorption peak intensity at 1,150 to 1,250 cm,and I,is an absorption peak intensity at 1,000 to 1,100 cm,) between the infrared absorption spectra in the region of 1,150 to 1,250 cm,and the region of 1,000 to 1,100 cm,of 0.2 or more, and having a refractive index of 1.435 or more.

Cosmetics, silica-coated metal oxide powder and production method therefor

A process for forming a silica film on a substrate, comprising the steps of preparing a liquid composition comprising silicic acid, water, an alkali and an organic solvent, said liquid composition having a volume ratio of water to the organic solvent in a range of 0.2 to 10.0 and a concentration of silicon element in a range of 0.0001 to 5.0 mol/l; contacting a surface of a substrate with the liquid composition; and maintaining the contact between the surface of the substrate with the liquid composition to selectively deposit silica on the surface of the substrate until a silica film is formed on the surface of the substrate.

Growing community of inventors

Kawasaki, Japan

Yasuo Saito