Patent ID: 7777129
Filing Date: 2010-08-17
Classification: B82Y,C01B,C01P,C09C,H01G,Y02E,Y02P

Abstract:
1. A method for producing a metal oxide structure, comprising dry-mixing a metal oxide, wherein when an optical band gap (hereinafter referred to as “BG”) of raw material metal oxide is BG0 and the BG of metal oxide after the dry mixing is BG1, the mixing is performed to give a (BG0-BG1) of 0.01 to 0.45 eV, wherein the raw material metal oxide comprises a metal oxide powder having an average primary particle size of 100 to 500 nm (hereinafter referred to as Particle Group A) and a metal oxide powder having an average primary particle size of 10 to 40 nm (hereinafter referred to as Particle Group B), the particle sizes being as converted from the specific surface area determined by the BET method, the blending ratio of Particle Group A and particle Group B being from 5/95 to 30/70 by mass, and wherein the dry mixing is performed by a ball mill and when the total mass of powder particles mixed is wp (g), the mass of medium is wm (g), the inner diameter of ball mill container is d (m), the rotation number is n (rpm) and the mixing time is t (minute), the energy constant k1 at the dry mixing represented by the following relationship: is from 3,000 to 250,000.