Method for preparing bore diameter/or bore pitch adjustable nano porous aluminum oxide film

A porous alumina and nanoporous technology, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of limiting the application range of porous anodic aluminum oxide film, prevent aging and breakdown phenomena, and inhibit chemical Corrosion action, effect of oxidation current suppression

Inactive Publication Date: 2008-08-06
NANJING UNIV
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AI Technical Summary

Problems solved by technology

However, there is no ideal method to control the critical pore size of anodized aluminum oxide membranes, which largely limits the application range of porous anodized aluminum oxide membranes.

Method used

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  • Method for preparing bore diameter/or bore pitch adjustable nano porous aluminum oxide film
  • Method for preparing bore diameter/or bore pitch adjustable nano porous aluminum oxide film

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Embodiment

[0020] The steps for preparing porous alumina membrane provided by the present invention are as follows:

[0021] (1) The aluminum sheet is annealed at 500°C for 5 hours under the protection of a nitrogen atmosphere. Electrochemical polishing for 5 minutes in a 1:5 mixture of perchloric acid and ethanol at a potential of 20V.

[0022] (2) Install the aluminum sheet pretreated in step (1) as the anode in the U-shaped electrolytic cell system, add different concentrations of phosphoric acid as the electrolyte and different concentrations and different molecular weight polyethylene glycols as the protective agent. A clean large area aluminum sheet is used as the cathode to form a two-electrode electrolysis system;

[0023] (3) Use a constant temperature water bath to control the temperature of the electrolytic cell;

[0024] (4) Use a potentiostat to control the oxidation potential;

[0025] (5) Connect the power supply in step (4) to the aluminum anode and aluminum cathode in step (...

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Abstract

A method for preparing nanometer porous pellumina which can regulate aperture and/or pitch of holes, which comprises the following steps: firstly, carrying out annealing and electrochemical polishing to an aluminum sheet, secondly, arranging the treated aluminum sheet in a constant-potential electrolytic cell, adding phosphorus acid solution as electrolyte, adding polyethylene glycol as adjusting agent, carrying out constant-potential anodic oxidation, then obtaining the nano-porous pellumina which can regulate aperture and/or pitch of holes, wherein the average molecular weight of polyethylene glycol is 400-2000, the mass percentage concentration n of the polyethylene glycol in the electrolyte is 0%<n<=50%, the concentration of the phosphorus acid in the electrolyte is 0.2-0.8 mole, and the electrolyzing time is 4-48h. Polyethylene glycol is adopted by the method as adjusting agent, effective adjusting to the aperture and the pitch of holes is realized, range of oxidizing electric potential is expanded through the chemical protection the electrochemical protection of polyethylene glycol, the used addition agent polyethylene glycol has the advantages of safety, environmental protection and low cost, therefore, the method is convenient to spread.

Description

Technical field [0001] The invention relates to a method for preparing an aluminum oxide membrane with controllable aperture and aperture distance, and belongs to the field of material chemistry. Background technique [0002] At present, porous alumina membrane is used as a template for nano-material preparation and nano-separation membrane, and its controllable preparation and application have attracted widespread attention. In these applications, the pore distribution, pore spacing, and pore diameter of the porous alumina membrane are all important parameters. At present, people use two-step anodic oxidation or template method to improve the order of pores, and adjust the pore spacing within a certain range through the selection of conditions such as potential and electrolyte concentration. However, there is no ideal method to adjust the critical pore size of anodized aluminum oxide membranes, which largely limits the application range of porous anodized aluminum oxide membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/16
Inventor 夏兴华陈伟吴剑霜
Owner NANJING UNIV
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