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Preparation method for large-area ultrathin porous anodized alumina membranes

A kind of technology of anodized aluminum and porous film, applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of difficult maintenance and transportation, film curling, damage, etc., and achieve convenient storage and use, not easy to break, Simple operation effect

Active Publication Date: 2016-02-10
SHENZHEN TOPMEMBRANES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the ultra-thin anodized alumina porous membranes reported so far have a relatively small area (a few square centimeters), and there is no detailed research and optimization on the preparation technology of the key organic support layer on the surface of the membrane.
If the organic solution spin-coating method is used, the obtained organic layer is too thin to maintain and transport; the organic solution is directly drip-cast on the surface of the film without optimizing the preparation process, and when the film area is larger than tens of square centimeters, the entire film will appear. Curling phenomenon, also unable to hold, transport and use
In the prior art, there is a technical solution of using a thicker organic support layer in order to reduce its bending degree, but it will cause the anodized aluminum porous membrane to easily fall off from the bottom of the organic layer and be damaged

Method used

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  • Preparation method for large-area ultrathin porous anodized alumina membranes
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  • Preparation method for large-area ultrathin porous anodized alumina membranes

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Embodiment 1

[0036] A method for preparing a large-area ultra-thin anodized aluminum porous membrane, comprising the following steps:

[0037] S1. Preparation of aluminum oxide porous membrane: a polished aluminum sheet is anodized twice in a sulfuric acid solution with a mass percentage concentration of 1% to obtain a single-pass ultra-thin anodized aluminum oxide porous membrane with an aluminum base;

[0038]S2. Pre-expansion treatment: put the single-pass ultra-thin anodized aluminum porous membrane with aluminum base into a phosphoric acid solution with a concentration of 10% by mass, and expand the pores at 35° C. for 5 minutes;

[0039] S3. Preparation of the organic support layer; drop an organic solution on the surface of the pre-expanded single-pass ultra-thin anodized aluminum porous membrane with an aluminum base, shake to make the organic solution evenly distributed on the surface, and then heat it at 120 ° C. Bake for 25min, and the time interval between adding the organic so...

Embodiment 2

[0042] A method for preparing a large-area ultra-thin anodized aluminum porous membrane, comprising the following steps:

[0043] S1. Preparation of aluminum oxide porous membrane: a polished aluminum sheet is anodized twice in a phosphoric acid solution with a mass percent concentration of 10% to obtain a single-pass ultra-thin anodized aluminum oxide porous membrane with an aluminum base;

[0044] S2. Pre-expanding treatment: put the single-pass ultra-thin anodized aluminum porous membrane with aluminum base into a phosphoric acid solution with a mass percentage concentration of 1%, and expand the pores at 25° C. for 50 minutes;

[0045] S3. Preparation of the organic support layer; drop an organic solution on the surface of the pre-expanded single-pass ultra-thin anodized aluminum porous membrane with an aluminum base, shake to make the organic solution evenly distributed on the surface, and then heat it at 150°C Bake for 5s to form an organic support layer; wherein, the so...

Embodiment 3

[0048] A method for preparing a large-area ultra-thin anodized aluminum porous membrane, comprising the following steps:

[0049] S1. Preparation of aluminum oxide porous membrane: a polished aluminum sheet is anodized twice in sulfuric acid and oxalic acid with a mass percentage concentration of 5% to obtain a single-pass ultra-thin anodized aluminum oxide porous membrane with an aluminum base;

[0050] S2. Pre-expanding treatment: put the single-pass ultra-thin anodized aluminum porous membrane with an aluminum base into a phosphoric acid solution with a mass percent concentration of 4%, and expand the pores at 25° C. for 100 minutes;

[0051] S3. Preparation of organic support layer; drop an organic solution on the surface of the pre-expanded single-pass ultra-thin anodized aluminum porous membrane with an aluminum base, shake it to make the organic solution evenly distributed on the surface, and then heat it at 135°C Baking for 15min, the time interval between the dropping...

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Abstract

The invention discloses a preparation method for large-area ultrathin porous anodized alumina membranes. The preparation method comprises the steps of S1, preparing porous alumina membranes; S2, pre-chambering; S3, preparing organic matter supporting layers; S4, removing aluminum substrates and barrier layers. According to the preparation method for the large-area ultrathin porous anodized alumina membranes, the large-area ultrathin porous anodized alumina membranes can be prepared, the structure is regular, and the thickness ranges from 100 nm to 400 nm. By carrying out pre-chambering treatment on the porous membranes and controlling the thickness of the organic matter supporting layers, the porous membranes are insusceptible to breakage and can tightly adhere to the organic matter supporting layers so as to be conveniently transferred to a target substrate. The ultrathin porous anodized alumina membranes with the area larger than 50 cm<2> can be obtained. The preparation method has the advantages that the number of the steps is small, the operation is easy and the preparation conditions are mild and easy to realize.

Description

technical field [0001] The invention relates to a method for preparing a large-area ultra-thin anodized aluminum oxide porous membrane, and specifically belongs to the technical field of anodized aluminum oxide porous membranes. Background technique [0002] Commonly used methods for preparing nanostructured materials include self-organized growth, electron beam lithography, and nanoimprinting. However, these methods require high process and equipment and low yield, so the cost is high. Template synthesis of nanostructure units and nanostructure array systems is a simple and universal synthesis process, and anodized aluminum multi-template has the advantages of low cost, uniform and orderly distribution of cavities, and controllable size, and is ideal for preparing highly ordered nanomaterials. Ideal template for . Among them, the ultra-thin anodized aluminum oxide porous membrane (thickness not greater than 1 μm) has a wide range of applications in the preparation of high...

Claims

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Application Information

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IPC IPC(8): C25D11/12C25D11/18
CPCC25D11/12C25D11/18
Inventor 郭秋泉赵呈春杨军
Owner SHENZHEN TOPMEMBRANES INC
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