| 摘要 |
<p>A composite sheet comprises a porous inorganic membrane and a microporous inorganic film (10) overlying a surface (18) of the membrane, where the membrane may be an anodic aluminium oxide membrane having an average pore diameter of 5 to 100nm, 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.</p> |
