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Method for preparing nano/submicron/micron multi-stage anode alumina template

An anodized aluminum and anodizing technology, applied in anodizing, nanotechnology and other directions, can solve the problems of complex equipment and process, difficult to obtain raw materials in batches, high cost, etc. Effect

Inactive Publication Date: 2015-01-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the disadvantages of difficult batch acquisition of raw materials in the prior art, high cost, complicated equipment and process, etc., and provides a preparation method of nano / submicron / micron multi-level anodized aluminum template. It is completed by membrane and hole expansion process, which has the advantages of low cost, simple process and good repeatability.

Method used

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Embodiment

[0031] A method for preparing a nano / submicron / micron multi-level anodized aluminum template, comprising the following steps:

[0032] (1) Cleaning high-purity aluminum flakes with a mass fraction ≥ 99.99% in absolute ethanol and deionized water to obtain clean aluminum flakes;

[0033] (2) With the clean aluminum sheet obtained in step (1) as the anode and the graphite as the cathode, carry out electrochemical polishing at a constant voltage in a mixed solution with a volume ratio of perchloric acid and absolute ethanol of 0.2:1 at 0°C. 18V, the polishing time is 8 minutes, and the polished aluminum sheet is obtained;

[0034] (3) The polished aluminum sheet obtained in step (2) is an anode, graphite is a cathode, and the volume ratio of solution A (0.28mol / L oxalic acid aqueous solution) and solution B (absolute ethanol) is A:B=1:1 The mixed solution is used for the anodizing process at a temperature of 0°C; Figure 1(a) ~ Figure 1(b) Be the voltage curve and current densit...

Embodiment 2

[0038] A method for preparing a nano / submicron / micron multi-level anodized aluminum template, comprising the following steps:

[0039] (1) Cleaning high-purity aluminum flakes with a mass fraction ≥ 99.99% in absolute ethanol and deionized water to obtain clean aluminum flakes;

[0040] (2) With the clean aluminum sheet obtained in step (1) as the anode and the graphite as the cathode, carry out electrochemical polishing at a constant voltage in a mixed solution with a volume ratio of perchloric acid and absolute ethanol of 0.3:1 at 5° C. 25V, the polishing time is 5 minutes, and the polished aluminum sheet is obtained;

[0041] (3) the polished aluminum sheet that obtains with step (2) is anode, and graphite is cathode, and the volume ratio of solution A (0.32mol / L oxalic acid aqueous solution) and solution B (dehydrated alcohol) is A:B=20:1 The mixed solution of the anodic oxidation process is carried out at a temperature of 5°C: firstly, the constant current density is use...

Embodiment 3

[0045] A method for preparing a nano / submicron / micron multi-level anodized aluminum template, comprising the following steps:

[0046] (1) Cleaning high-purity aluminum flakes with a mass fraction ≥ 99.99% in absolute ethanol and deionized water to obtain clean aluminum flakes;

[0047] (2) With the clean aluminum sheet obtained in step (1) as the anode and the graphite as the cathode, carry out electrochemical polishing at a constant voltage in a mixed solution with a volume ratio of perchloric acid and absolute ethanol of 0.25:1 at 3° C. It is 22V, and the polishing time is 6 minutes to obtain a polished aluminum sheet;

[0048] (3) The polished aluminum sheet that obtains with step (2) is anode, and graphite is cathode, and the volume ratio of solution A (0.30mol / L oxalic acid aqueous solution) and solution B (dehydrated alcohol) is A:B=10:1 The mixed solution is used for the anodic oxidation process at a temperature of 3°C: first, the constant current density is used to b...

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Abstract

The invention discloses a method for preparing a nano / submicron / micron multi-stage anode alumina template. The method comprises the following steps: firstly, washing a high-purity aluminum sheet, and subsequently performing electrochemical polishing; performing anodic oxidation by using an oxalic acid-water-ethanol mixed solution as electrolyte, thereby obtaining a porous anode alumina membrane with an aluminum substrate; enabling a submicron structural unit to enter into a competitive growth mode by adjusting the conditions of voltage and the current density, thereby forming island-shaped and strip-shaped micro-grade structure unit clusters of different shapes; putting the alumina membrane with the aluminum substrate into a chromium trioxide and phosphoric acid mixing solution so as to remove the membrane, subsequently performing low-voltage anode oxidation in an oxalic acid solution, and performing hole expansion treatment by using a phosphoric acid solution, thereby obtaining the anode alumina template of a nano / submicron / micron multi-stage pore pipeline structure. The method has the advantages that the raw materials are easily available, the cost is low, the equipment is simple, the controllability is good, and the like, and the feasibility of industrial production is greatly improved.

Description

technical field [0001] The invention relates to a method for preparing a nano / submicron / micron multilevel anodized aluminum template, in particular to a preparation method for a nanometer / submicron / micron multilevel anodized aluminum template. Background technique [0002] There are many natural nano / submicron / micron multi-level composite structural materials in nature, such as the surface of lotus leaves, rice leaves, shark skin, etc. As an important class of functional materials, they are one of the important components of the colorful nature . At present, artificially synthesized nano / submicron / micron multilevel composite structure materials have been widely used in many disciplines and fields such as superhydrophobicity and bionics because of their excellent properties. At present, the methods for preparing nano / submicron / micron multi-level composite structure materials are mainly direct synthesis method and template method. Compared with the direct synthesis method, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04B82Y40/00
CPCC25D11/04B82Y40/00
Inventor 李屹覃玉燕凌志远
Owner SOUTH CHINA UNIV OF TECH
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