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1. (WO1997006896) POROUS METAL-OXIDE THIN FILM AND METHOD OF FORMING SAME ON GLASS SUBSTRATE

Pub. No.:    WO/1997/006896    International Application No.:    PCT/US1995/011512
Publication Date: Feb 27, 1997 International Filing Date: Aug 14, 1995
IPC: C03C 17/00
C03C 17/25
Applicants: CENTRAL GLASS COMPANY LIMITED
YAMAZAKI, Seiji
Inventors: YAMAZAKI, Seiji
Title: POROUS METAL-OXIDE THIN FILM AND METHOD OF FORMING SAME ON GLASS SUBSTRATE
Abstract:
The invention relates to a porous metal-oxide film formed on a glass substrate by the sol-gel process. The film is prepared by a method comprising the steps of: (a) preparing a coating solution by mixing a metal alkoxide(s) and/or a metal acetylacetonate(s), a first solvent, water, an acid and an organic polymer; (b) applying the coating solution to the glass substrate; (c) drying a gel film formed thereon at a first temperature not higher than 100 °C; (d) contacting the gel film with a second solvent which is one of an acid solution and a mixed solution of alcohol and water; and (e) heating the gel film at a second temperature so as to transform the gel film into the porous metal-oxide film. The porous metal-oxide film's surface is minutely rough and has a fine features pattern of three-dimensional micro-porous structure.