Composite membrane

Details Composite membrane Composite membrane

1987-04-16

1990-07-03

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050025, 21050026, B01D 7104

Patent

active

049388703

ABSTRACT:
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.

REFERENCES:
patent: 3923654 (1975-12-01), O'Hern et al.
patent: 4214020 (1980-07-01), Ward et al.
patent: 4689150 (1987-08-01), ABE et al.

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