Patent ID: 8505744

Claim:
A method of producing a nanoporous oxide ceramic membrane by anodization, comprising: providing a metallic tube in a tubular or hollow fiber shape of predetermined dimension; placing the metallic tube inside a cathode in cylindrical symmetry to each other; placing a heat sink inside the metallic tube in cylindrical symmetry to each other, and in contact or in close contact with an inner wall of the metallic tube so as to sufficiently absorb heat generated during anodization and to make the anodization process proceed in a steady state; filling an electrolyte in a bath to soak an outer wall surface of the metallic tube and the cathode with the electrolyte; and anodizing the metallic tube to produce a nanoporous oxide ceramic membrane, said anodizing performed by applying electric current between the metallic tube as an anode and the cathode while absorbing heat produced during the anodization from the inner wall of the metallic tube via the heat sink.