Method for manufacturing anodic metal oxide nanoporous templates

Patent metadata

Field	Value
Publication number	US-2017029969-A1
Application number	US-201615200647-A
Country	US
Kind code	A1
Filing date	Jul 1, 2016
Priority date	Jul 2, 2015
Publication date	Feb 2, 2017
Grant date	—

Abstract

Disclosed is a method for manufacturing anodic metal-oxide nanoporous templates with high-yield and in an environmentally-friendly manner. The method includes anodizing a metal specimen and detaching nanoporous anodic oxide layers, which are formed on more than one surface of the metal specimen due to the anodizing, from the metal specimen, wherein the detaching of the nanoporous anodic oxide layers from the metal specimen includes applying a reverse bias to the metal specimen in the same acidic electrolyte used for anodization.

First claim

1 . A method for manufacturing anodic metal-oxide nanoporous templates, the method comprising:
anodizing a metal specimen to form nanoporous anodic oxide layers; and detaching said nanoporous anodic oxide layers from the metal specimen, wherein the detaching of the nanoporous anodic oxide layers from the metal specimen comprises applying a reverse bias to the metal specimen.

2 . The method of claim 1 , wherein the anodizing of the metal specimen comprises:
pre-anodizing the metal specimen by dipping at least more than one surface of the metal specimen in an acidic electrolyte and by applying a forward bias for anodization of the metal specimen; main-etching the metal specimen to remove at least more than one of the pre-anodized oxide layers that are generated by the pre-anodizing; and main-anodizing the metal specimen to form main-anodized oxide layers by dipping in an acidic electrolyte at least more than one surface of the metal specimen, which is textured through the main etching, and by reapplying a forward bias for anodization to the textured metal specimen.

3 . The method of claim 2 , further comprising, after detaching the main-anodized oxide layers from the metal specimen, sub-etching the metal specimen to remove remaining residual oxide layers from at least more than one surface of the metal specimen.

4 . The method of claim 3 , wherein the pre-anodizing, the main-etching, the main-anodizing, the detaching of the main-anodic oxide layer, and the sub-etching are repeated at least two or more times.

5 . The method of claim 1 , further comprising:
before the anodizing of the metal specimen, electro-polishing at least more than one surface of the metal specimen.

6 . A method for manufacturing anodic metal-oxide nanoporous templates, the method comprising:
providing an aluminum specimen; electro-polishing the surfaces of the aluminum specimen in a solution containing perchloric acid and ethanol; pre-anodizing the electro-polished aluminum specimen by dipping the electro-polished metal specimen in a sulfuric acid solution and by applying a forward bias for anodization to the electro-polished aluminum specimens; main-etching pre-anodic aluminum oxide (pre-AAO) layers, which are generated by the pre-anodizing in a chromic acid solution; main-anodizing the aluminum specimen to form main-AAO layers by dipping at least one surface of the aluminum specimen, which is textured through the main etching, in a sulfuric acid solution and by reapplying a forward bias for anodization to the textured aluminum specimen; and applying a reverse bias to the aluminum specimen to detach main-AAO layers, which are generated by the main anodizing from the aluminum specimen.

7 . The method of claim 6 , further comprising: after applying the reverse bias to the aluminum specimen, sub-etching the aluminum specimen to remove remaining residual oxide layers from more than one surface of the metal specimen.

8 . The method of claim 7 , wherein the steps from pre-anodizing through sub-etching are repeated at least two or more times.

Assignees

• Univ Korea Res & Bus Found

Inventors

• Joo Jinsoo
• Hong Young Ki

Classifications

• C25D1/10 Primary

  Moulds; Masks; Masterforms · CPC title

• C25D1/20

  Separation of the formed objects from the electrodes {with no destruction of said electrodes} · CPC title

• C25D1/006

  Nanostructures, e.g. using aluminium anodic oxidation templates [AAO] · CPC title

• C25D11/18

  After-treatment, e.g. pore-sealing · CPC title

• C25D11/12

  Anodising more than once, e.g. in different baths · CPC title