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Preparation method of porous alumina die plate with pore diameter and thickness gradient change

A porous alumina and gradient change technology, applied in the field of electrochemistry, can solve the problems of large pore size, small gradient change of PAA membrane pore size, and unsuitability for preparing templates from nanomaterials.

Active Publication Date: 2020-07-03
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, the pore size gradient of the PAA membrane prepared by this method is small, and the pore size is large (130-305 nm), which is not suitable for the research on the preparation of nanomaterials.

Method used

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  • Preparation method of porous alumina die plate with pore diameter and thickness gradient change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Electrochemical polishing was performed on both sides of a 250 μm thick aluminum foil (length 6 cm × width 1 cm), including the following steps: (1) soaking in 2 wt% NaOH solution for 2 minutes; (2) using the aluminum sheet as the anode , the graphite sheet is the cathode, and the 3 PO 4 , 12 wt% CrO 3 , 8 wt% H 2 Constant current electrochemical polishing was performed in a mixed solution of O for 2 minutes at a current density of 120 mAcm -2 , and then rinsed with deionized water. The polished aluminum sheet is placed in the middle of an electrolytic cell composed of two parallel graphite plate electrodes with the length direction as the longitudinal direction, and the plane where the aluminum sheet is located is perpendicular to the plane of the graphite plate electrode. The distance from the two long sides of the aluminum sheet to the electrode of the adjacent graphite plate is equal to 1 cm. The electrolyte used is 0.3 M oxalic acid in ethylene glycol solution....

Embodiment 2

[0022] Except that the oxidation voltage was 350 V, other steps were the same as in Example 1.

Embodiment 3

[0024] Except that the oxidation voltage was 300 V and the electrolyte used was 0.5 M oxalic acid in ethylene glycol, other steps were the same as in Example 1.

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Abstract

The invention discloses a preparation method of a porous aluminum oxide die plate with the pore diameter and thickness gradient change, namely, under the condition of bipolar electrochemical anodic oxidation, an aluminum sheet generates a reaction in an ethylene glycol solution of oxalic acid to generate a PAA film with the pore diameter and thickness in gradient distribution. On the same aluminumsheet, the maximum ratio of the maximum pore diameter to the minimum pore diameter on the PAA film is 6.0, the maximum ratio of the maximum thickness to the minimum thickness is 6.4, and the pore diameter, the thickness and the gradient change can be regulated by changing the voltage and the oxalic acid concentration. By the adoption of the method, the PAA film with regular pore diameter and thickness in gradient distribution can be obtained by one-time preparation on the aluminum sheet, and the aluminum sheet does not need to be directly connected with a power line, and the process is simpleand controllable.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a preparation method of a porous anodic alumina template, in particular to an electrochemical preparation method of a porous alumina template with gradient changes in aperture and thickness. Background technique [0002] The porous anodic aluminum oxide (PAA) membrane prepared by anodic oxidation is a self-assembled hexagonal close-packed nanopore array structure, which has the advantages of simple preparation process, low cost, controllable pore size, high pore density, and easy to be Acid or alkali chemical dissolution and other advantages. In recent years, using PAA as a template, combined with electrochemical deposition, chemical or electrochemical polymerization, chemical vapor deposition, sol-gel and electrophoretic deposition have successfully synthesized and assembled metal, alloy, nonmetal, polymer and other Arrays of nanotubes, nanowires, and quantum dots made o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/10C25D11/16C25D11/24C25F3/20
CPCC25D11/045C25D11/10C25D11/16C25D11/24C25F3/20
Inventor 宋晔徐大伟李晨张钊荧朱绪飞
Owner NANJING UNIV OF SCI & TECH
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