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Modulation method for shape morphing of hole of anodic aluminum oxide template

A technology of anodized aluminum and modulation method, which is applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve rare problems, and achieve the effect of simple implementation, low cost, and flexible and adjustable three-dimensional shape

Inactive Publication Date: 2012-01-25
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on how to effectively and easily control the three-dimensional gradient of the pores of the porous anodized alumina template.

Method used

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  • Modulation method for shape morphing of hole of anodic aluminum oxide template
  • Modulation method for shape morphing of hole of anodic aluminum oxide template
  • Modulation method for shape morphing of hole of anodic aluminum oxide template

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Ultrasonic cleaning of high-purity aluminum in acetone and ethanol for 5 minutes, blowing dry with nitrogen, annealing at 400°C to 550°C under nitrogen protection for 1 to 5 hours, and then placing it in a mixed solution of perchloric acid and ethanol at 0°C (Volume ratio is 1:4), polish at a voltage of 20V for 5-10 minutes. After polishing, the aluminum sheet is pre-oxidized in oxalic acid solution to remove the oxide layer, then taken out after oxidizing in oxalic acid solution for 10-80s, soaking in phosphoric acid solution for 5min-15min, and then taking it out after oxidizing in oxalic acid solution for 10-80s, and then oxidizing it in 5wt %, 30°C phosphoric acid solution, soak for 5min to 15min. A gyro-shaped porous alumina template can be obtained after two times of oxidation / one time of hole expansion (such as Figure 2a shown), the funnel-shaped porous alumina template was obtained after three times of oxidation / two times of hole expansion (such as Figure 2b...

Embodiment 2

[0024] Ultrasonic cleaning of high-purity aluminum in acetone and ethanol for 5 minutes, blown dry with nitrogen, placed in a mixed solution of perchloric acid and ethanol (volume ratio 1:4) at 0°C, and polished at a voltage of 20V for 5-10 minute. Use silicon dioxide nanospheres to make pits on the surface of the polished aluminum sheet, oxidize in 2vol% phosphoric acid solution for 10sec~15min, take it out, soak in 5wt% phosphoric acid solution for 5min~30min, and then oxidize in 2vol% phosphoric acid solution for 10sec Take it out after ~15min, and then soak it in 5wt% phosphoric acid solution at 30°C for 5min~30min. After 4-7 times of oxidation / 3-6 times of hole expansion, an inverted conical porous alumina template is obtained, wherein the single oxidation time is the same, and the single hole expansion time is the same.

Embodiment 3

[0026] Ultrasonic cleaning of high-purity aluminum in acetone and ethanol for 5 minutes, blown dry with nitrogen, placed in a mixed solution of perchloric acid and ethanol (volume ratio 1:4) at 0°C, and polished at a voltage of 20V for 5-10 Minutes; After polishing, the aluminum sheet is pre-oxidized in a phosphoric acid-methanol mixed solution to peel off the oxide layer, and then performs discontinuous oxidation and hole expansion in a phosphoric acid solution. The number of oxidations is fixed at 5 to 7 times, and the number of hole expansion is fixed at 4 ~6 times. The total oxidation time is 70sec~70min, and the total hole expansion time is 30min~210min. When the first oxidation time is 50sec~15min, and the first hole expansion time is 5min~10min, in the subsequent discontinuous oxidation process, with the increase of oxidation times, the single oxidation time is reduced by 5sec compared with the previous oxidation time ~90sec, the single reaming time is 5min~10min longe...

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Abstract

The invention discloses a modulation method for shape morphing of a hole of an anodic aluminum oxide template, which comprises the following steps: I. removing grease and dirt of the surface of annealing-treated or untreated aluminium foil, and then carrying out electrochemical polishing treatment on the aluminium foil for later use; II. forming pit patterns on the surface of the aluminium foil by adopting an electrochemical oxidation method or a hard template mechanical pitting method; and III. carrying out noncontinuous oxidation and chambering on the aluminium foil the surface of which is provided with the pit patterns in an acid electrolyte to form various three-dimensional morphing-type aluminum oxide nanopore array structures by the combination control of electrolyte composition, electrolyte temperature, oxidation voltage, oxidation and chambering frequency and oxidation and chambering time. The modulation method uses existing equipment, has simple implementation and can manufacture various three-dimensional morphing shape-adjustable porous anodic aluminum oxide templates in manner of low cost and big area.

Description

technical field [0001] The invention relates to the field of electrochemical manufacturing of porous alumina templates, in particular to an anodized alumina template for preparing a three-dimensional gradient nano-hole whose internal shape can be adjusted and a manufacturing method thereof. Background technique [0002] High-purity aluminum is anodized in an acidic electrolyte to obtain a porous alumina membrane. The nano-scale columnar pores of uniform size are arranged in parallel to the membrane surface, and the membrane cells where the nanopores are located are arranged in a hexagonal close-packed arrangement. It is a A typical self-organized nanomaterial. Alumina porous membrane has excellent chemical stability, high temperature resistance, insulation, and is transparent in visible and most infrared light regions. By selecting appropriate electrolyte and anodic oxidation parameters, aluminum oxide films with adjustable structural parameters and ordered pores can be obt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D11/10C25D11/16C25D11/12
Inventor 高雪峰李娟
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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