Alcan International Limited

Rowena R Landham

Ernest P Butler

Michael P Thomas

A composite sheet comprises a porous inorganic membrane and a microporous inorganic film overlying a surface of the membrane, where the membrane may be an anodic aluminium oxide membrane having an average pore diameter of 5 to 100 nm, and the microporous film is of substantially uniform pore size and substantially free of cracks and pinholes. The film may be formed by applying a colloidal sol of an aluminium alkoxide, or a solution of a polymeric precursor of a titanium oxide, to a surface of the membrane to form thereon a gel layer, and drying and heating the gel to convert it to a microporous inorganic film.

Composite membrane

A composite sheet comprises a porous inorganic membrane and a microporous inorganic film overlying a surface of the membrane, where the membrane may be an anodic aluminum oxide membrane having an average pore diameter of 5 to 100 nm, and the microporous film is of substantially uniform pore size and substantially free of cracks and pinholes. The film may be formed by applying a colloidal sol of an aluminum alkoxide, or a solution of a polymeric precursor of a titanium oxide, to a surface of the membrane to form thereon a gel layer, and drying and heating the gel to convert it to a microporous inorganic film.

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Solihull, United Kingdom

Rowena R Landham