Preparation method for anode alumina template having gradient nanometer pore size

A technology of anodized aluminum and aluminum oxide templates, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problem of poor uniformity of gradient nanopores, complicated preparation process, non-perpendicular pores and anodized aluminum surfaces, etc. question

Active Publication Date: 2013-02-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

But regarding anodized aluminum oxide with gradient nanopore size (such as figure 1 Shown) the patent does not appear, consult literature and find that there is only an article published in "ACS Applied Materials & Interfaces" by Krishna Kant et al. The method is to place the anode (aluminum sheet) and the cathode at a certain angle, and then form a gradient electric field on the aluminum sheet, and form anodized aluminum with gradient nanopore diameter after anodic oxidation, but the anodized aluminum obtained by this method The uniformity of gradient nanopores is poor, the obtained pores are not perpendicular to the surface of anodized aluminum, and the preparation process is complicated

Method used

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  • Preparation method for anode alumina template having gradient nanometer pore size
  • Preparation method for anode alumina template having gradient nanometer pore size

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Embodiment 1

[0018] (1) Soak an aluminum sheet with a purity of 99.999% in an acetone solution with a mass fraction of 95% for degreasing treatment, take it out, and then soak it in an aqueous NaOH solution with a mass fraction of 5% for 5 minutes to remove the surface of the aluminum sheet. The oxide layer; take it out and rinse it with distilled water, anneal in the air at 500 ° C for 10 hours and cool with the furnace; then at 0 ° C, at C 2 h 5 OH and HClO 4 Mixed solution [V(C 2 h 5 OH): V(HClO 4 )=4:1], carry out constant voltage (12V) electrochemical polishing for 3 to 5 minutes to remove the oxide layer on the surface of the aluminum sheet and improve the smoothness of the surface; then in 0.3mol / L of H 2 C 2 o 4 Anodic oxidation was carried out in aqueous solution (constant DC voltage 40V, anodic oxidation at 0°C for 6 hours). Dip the aluminum sheet template obtained after oxidation into H 3 PO 4 and H 2 CrO 4 In the mixture (H 3 PO 4 The mass fraction in the mixture i...

Embodiment 2

[0021] A commercially available porous anodized aluminum template was immersed in 30% H 2 C 2 o 4 In aqueous solution, H 2 C 2 o 4 The temperature of the aqueous solution was controlled at 20°C, and one end of the porous anodized aluminum template was clamped with a puller, and the porous anodized aluminum template was pulled from the H 2 C 2 o 4 Extracted from the aqueous solution to obtain an anodized aluminum template with a nano-pore diameter with a gradient change in the pore size of the lower part and the upper part.

Embodiment 3

[0023] A commercially available porous anodized aluminum template was immersed in 1% H 2 SO 4 In aqueous solution, H 2 SO 4 The temperature of the aqueous solution was controlled at 80°C, and one end of the porous anodized aluminum template was clamped with a puller, and the porous anodized aluminum template was pulled from the H 2 SO 4 Extracted from the aqueous solution to obtain an anodized aluminum template with a nano-pore diameter with a gradient change in the pore size of the lower part and the upper part.

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Abstract

The present invention relates to the field of porous anode alumina templates, particularly to a preparation method for an anode alumina template having a gradient nanometer pore size. According to the preparation method, a porous anode alumina template is immersed in an inorganic acid aqueous solution, and then is rapidly pulled out of the inorganic acid aqueous solution to obtain the anode alumina template having a gradient nanometer pore size, wherein the gradient nanometer pore size has a characteristic of large lower portion and small upper portion. According to the present invention, the preparation method has characteristics of convenience and rapidness, and various anode alumina templates having different gradient pore size changes can be prepared by changing the concentration and the temperature of the inorganic acid aqueous solution, and the pulling-out time.

Description

technical field [0001] The invention relates to the field of porous anodized aluminum templates, in particular to a method for preparing anodized aluminum templates with gradient nanometer apertures. Background technique [0002] Anodized aluminum film has good mechanical properties, high corrosion resistance, friction resistance, and strong adsorption. In addition to the above properties, the anodized aluminum film also has many good functional properties: for example, due to its excellent dielectric properties and unidirectional conductivity, it can be used as a dielectric material for storing charges to make electrolytic capacitors; using the selective absorption properties of light, It can be used as an optical functional material and widely used in optics, magnetism and other fields. With the continuous expansion of the application of anodized aluminum oxide film in various fields, its preparation and processing technology has been continuously developed, and new funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/18
Inventor 曾西平王健君宋延林
Owner INST OF CHEM CHINESE ACAD OF SCI
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