Method for rapid preparation of large-area highly ordered porous anodic aluminum oxide membrane with large pore spacing
A highly ordered and large-area technology, applied in the field of electrochemistry, can solve problems such as complex and cumbersome pretreatment processes and long preparation times
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Embodiment 1
[0024] First, immerse an aluminum foil strip with a purity of 99.99%, a thickness of 200 μm, and a width of 20 mm in a 2 wt % sodium hydroxide solution at a temperature of 70 ° C for 1 minute to remove the natural oxide film on the aluminum surface. Then rinse it with deionized water, put it into the electrolytic cell as the anode, and use another aluminum foil strip of the same size that has not been treated to remove the natural oxide film as the cathode. Use 30wt% ethyl phosphate aqueous solution as the electrolyte, constant voltage 200V, and carry out constant voltage anodic oxidation under the condition of vigorously stirring the electrolyte. The temperature of the electrolyte is kept at about 60°C by a water bath, the oxidation time is determined by the thickness of the PAA template, and the growth rate of the oxide film is about 3 μm·min -1 . The average hole spacing of PAA nanoholes is about 460nm.
Embodiment 2
[0026] First, immerse an aluminum foil strip with a purity of 99.99%, a thickness of 200 μm, and a width of 20 mm in a 2 wt % sodium hydroxide solution at a temperature of 70 ° C for 1 minute to remove the natural oxide film on the aluminum surface. Then rinse it with deionized water, put it into the electrolytic cell as the anode, and use another aluminum foil strip of the same size that has not been treated to remove the natural oxide film as the cathode. Use 30wt% ethyl phosphate aqueous solution as the electrolyte, constant voltage 230V, and carry out constant voltage anodic oxidation under the condition of vigorously stirring the electrolyte. The temperature of the electrolyte is maintained at about 10°C by a water bath. The oxidation time is determined by the thickness of the PAA template, and the growth rate of the oxide film is about 2.8 μm min -1 . The average hole spacing of PAA nanoholes is about 530nm.
Embodiment 3
[0028] First, immerse an aluminum foil strip with a purity of 99.99%, a thickness of 200 μm, and a width of 20 mm in a 2 wt % sodium hydroxide solution at a temperature of 70 ° C for 1 minute to remove the natural oxide film on the aluminum surface. Then rinse it with deionized water, put it into the electrolytic cell as the anode, and use another aluminum foil strip of the same size that has not been treated to remove the natural oxide film as the cathode. Using 20wt% phosphate monoester aqueous solution as the electrolyte, constant voltage 270V, under the condition of vigorously stirring the electrolyte, the constant voltage anodic oxidation is carried out. The temperature of the electrolyte is maintained at about 25°C by a water bath. The oxidation time is determined by the thickness of the PAA template, and the growth rate of the oxide film is about 2.5 μm min -1 . The average hole spacing of PAA nanoholes is about 620nm.
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