Surface preparation method of flexibility-controllable liquid drop self-driven multistage gradient structure

A gradient structure, self-driven technology, applied in the field of material surface modification, can solve the problems of expensive production equipment and complicated preparation process, and achieve the effect of improved hydrophobicity and simple and economical preparation method

Inactive Publication Date: 2017-09-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a flexible and controllable liquid droplet self-driven multi-level gradient structure surface preparation method, which improves the shortcomings of the curren

Method used

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  • Surface preparation method of flexibility-controllable liquid drop self-driven multistage gradient structure
  • Surface preparation method of flexibility-controllable liquid drop self-driven multistage gradient structure

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0021] Refer to the attached drawings. Embodiment 1 This embodiment includes the following steps:

[0022] Step (1) Prepare the coating solution: mix 5g of the prepolymer of the polydimethylsiloxane (PDMS) coating solution with 0.5g of the crosslinking agent and stir it evenly, then place it in a vacuum drying box and extract it with a vacuum pump for 20 minutes, and remove Bubbles in the solution to prepare a coating solution of polydimethylsiloxane;

[0023] Step (2) Preparing the masking plate: Take a piece of silicon template 3 with a length of 50mm, a width of 25mm, and a thickness of 1mm, and use a three-dimensional drawing software to draw a gradient structure layout. The gradient structure layout is based on a diameter of 10μm and a depth of 40μm. The cell holes in the template are distributed in a gradient, and the gradient distribution is based on the long side of the template. The cell hole spacing in the first 1mm distance is 10μm, and the cell hole spacing in the seco...

Example Embodiment

[0027] The difference between Example 2 and Example 1 is that the multi-level structure of Example 2 includes a first-level buckling base and a second-level cylindrical protrusion, and the second-level cylindrical protrusions are uniformly distributed radially on the surface of the flexion structure. The body is 40μm high and 10μm wide, and is arranged in a gradient on the template. The distance between the column and the column at a distance of 1 mm along the long side of the template is 10 μm, and the distance between the column and the column in the next 1 mm distance increases to 20 μm and so on, such as figure 2 Shown. This multi-level composite structure can change the interface of different phases, change the interface energy, and increase the hydrophobicity of the material surface, and due to the existence of the gradient structure, there are differences in hydrophobicity between different areas on the material surface. Since the flexible base VHB tape 4 is used, the ...

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Abstract

The invention discloses a surface preparation method of a flexibility-controllable liquid drop self-driven multistage gradient structure. The method includes following steps: (1), preparing coating liquid; (2), preparing a covering plate; (3), preparing a multistage gradient structure surface having flexibility; (4), adjusting and controlling the flexible surface. On the basis that a flexible material is combined with a bent structure, and the coating liquid immerses into holes in a silicon template and solidifies to form a cylindrical structure. The preparation method is simple and efficient, and probability of directionally driving liquid drops is realized. The multistage structure is prepared by using a flexible VHB adhesive tape as a substrate, so that changing of arrangement density of the multistage structure can be realized by stretching the substrate, and control on liquid drop directional driving speed can be realized. Pre-stretching strain of the VHB adhesive tape can be changed properly, so that acquired bending and wrinkling amplitude is changed correspondingly.

Description

technical field [0001] The invention belongs to the field of material surface modification, and in particular relates to a surface preparation method of a flexible and controllable droplet self-driven multi-level gradient structure. Background technique [0002] Wettability is one of the important properties of a solid surface, which characterizes the degree of wetting of a liquid on its surface. The wettability of a solid surface mainly depends on the surface free energy and surface microstructure. Changing the free energy and roughness of a solid surface can change its wettability. The wettability gradient surface is a high-performance material whose composition, structure, and wettability change continuously or stepwise with space. The unequal surface tension causes the liquid to have a tendency to flow automatically from places with low surface energy to places with high surface energy. The so-called controllable wettability surface refers to the material surface whose...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L83/04
CPCC08J5/18C08J2383/04
Inventor 吴化平徐振雄杨哲梁利华刘爱萍张征丁浩李吉泉鲁聪达曹彬彬
Owner ZHEJIANG UNIV OF TECH
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