Preparation method of structure with controllable surface hydrophobic property

A high-performance and hydrophobic technology, applied in the photoengraving process of the pattern surface, the process for producing decorative surface effects, and the microstructural technology, which can solve the problem of rarely preparing hydrophobic controllable structures and reduce processing costs. , the effect of reducing difficulty and increasing possibility

Inactive Publication Date: 2016-02-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although superhydrophobic structures and non-superhydrophobic structures can be prepared in the prior art, there are few structures with controllable hydrophobicity.

Method used

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  • Preparation method of structure with controllable surface hydrophobic property
  • Preparation method of structure with controllable surface hydrophobic property
  • Preparation method of structure with controllable surface hydrophobic property

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Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Concrete implementation steps of the present invention are as follows:

[0039] 1) Spin-coat a layer of SU8-82000 negative photoresist on the silicon substrate with a thickness of 100 μm, and then expose it with a mask plate with a circular light-transmitting array, wherein the mask with a circular light-transmitting array The diameter of the circular hole of the membrane plate is 600 μm, and the distance between two adjacent circular holes is 800 μm. The shape of the mask plate is as follows: figure 1 As shown, the shaded part is a circular light-transmitting area.

[0040] 2) Put the structure obtained after exposure in step 1) into a developing solution for development. After development, the areas that are not exposed to light due to the mask plate are washed away, and finally, a silicon wafer substrate with a cylindrical protrusion array is obtained .

[0041] 3) Spin-coat a layer of polydimethylsiloxane (PDMS) with a curing agent on the silicon wafer substrate w...

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Abstract

The invention discloses a preparation method of a structure with a controllable surface hydrophobic property. The preparation method comprises the specific steps that a PDMS structure with a cylindrical pit array is manufactured through a soft lithography rolling-over method at first; then a smaller cylindrical pit array is processed in the pit array through femtosecond laser; a round hole array is processed on a steel sheet, the steel sheet and the overall PDMS structure are bonded through surface treatment, wherein round holes correspond to cylindrical pits; a cavity with a small hole is adhesively connected to the overall structure; finally, a micro air pump is in sealed connection with the cavity through the small hole; the surface hydrophobic property of the structure can be controlled by controlling the gas quantity in the cavity. According to the structure, with the controllable surface hydrophobic property, prepared through the preparation method, the surface hydrophobic property of the structure can be changed by not replacing a structure surface coating; due to the fact that a surface structure protrusion can change in a stepless mode under the effect of air pressure, the hydrophobic property can be controlled in a stepless mode.

Description

Technical field: [0001] The invention belongs to the technical field of micro-nano manufacturing, and in particular relates to a method for preparing a structure with controllable surface hydrophobic properties. Background technique: [0002] Due to the potential applications of superhydrophobic structures in surface cleaning, microfluidic systems and biocompatibility, it has become one of the research hotspots in recent years. The hydrophobic principle of the so-called superhydrophobic structure is mainly to make the liquid in the Cassie-Baxter state on the surface of the microstructure. At this time, the droplet is held by the surface microstructure and air and does not completely touch the solid surface. The corners are so small that the droplets can easily roll off the surface, thus having a self-cleaning function. The non-superhydrophobic surface can attach certain liquid droplets. Although superhydrophobic structures and non-superhydrophobic structures can be prepare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B81C1/00B81C3/00
Inventor 王朝晖沈亮卫首鹏凌杰蒋庄德
Owner XI AN JIAOTONG UNIV
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