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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 current prior art, such as complicated preparation process and expensive manufacturing equipment, and provides A simple, economical and environmentally friendly preparation method that greatly reduces the cost of regulating droplet actuation

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

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Embodiment 1

[0021] Refer to attached picture. Embodiment 1 The present embodiment comprises the following steps:

[0022] Step (1) Preparation of coating solution: 5g of polydimethylsiloxane (PDMS) coating solution prepolymer and 0.5g of crosslinking agent were mixed and stirred evenly, and then placed in a vacuum drying oven for 20 minutes with a vacuum pump to remove bubbles in the solution to prepare a polydimethylsiloxane coating solution;

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

Embodiment 2

[0027] Example 2 The difference from Example 1 is that the multi-level structure of Example 2 includes a primary buckling base and secondary cylindrical protrusions, and the secondary columnar protrusions are distributed radially and uniformly on the surface of the buckling structure, and the cylindrical The body is 40 μm high and 10 μm wide, arranged in a gradient on the template. The column-to-column distance is 10 μm in the distance of 1 mm along the long side of the template, and the distance between the column and the column is increased to 20 μm in the next 1 mm distance, and so on, such as figure 2shown. This multi-level composite structure can change the interface of different phases, change the interfacial energy, increase the hydrophobicity of the material surface, and due to the existence of the gradient structure, there is a difference in hydrophobicity between different regions of the material surface. Since the flexible base VHB tape 4 is used, the density arra...

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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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