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Micro-nanostructure controlled copper-based superhydrophobic surface and preparation method and application thereof

A technology of super-hydrophobic surface and micro-nano structure, which is applied in the field of super-hydrophobic surface materials and its preparation, can solve problems such as difficulty in adapting to customized requirements, increased economic costs, and operational complexity, and achieves convenient batch preparation, simple operation, and economical good sex effect

Inactive Publication Date: 2017-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual way to restore hydrophobicity is to replace the surface or re-coat, which again leads to an increase in operational complexity and economic costs
Furthermore, most of the solutions (such as Chinese patents CN103981547A, CN104722465A, CN102102199A, CN103952712A, CN104649233A) have poor controllability for surface micro-nanostructures, especially nanostructures, and the surface micro-nanostructures are directly related to including hydrophilic and hydrophobic properties. Many properties, so these methods are difficult to adapt to the customization requirements of different application fields

Method used

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  • Micro-nanostructure controlled copper-based superhydrophobic surface and preparation method and application thereof
  • Micro-nanostructure controlled copper-based superhydrophobic surface and preparation method and application thereof
  • Micro-nanostructure controlled copper-based superhydrophobic surface and preparation method and application thereof

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preparation example Construction

[0041] The preparation process conditions of the copper-based superhydrophobic surface of the present invention are further described below.

[0042] 1. Control the micron structure through laser process parameters.

[0043] A computer-aided drawing system is used to control the laser scanning path to obtain patterns with different micron geometric features. The micron structure of the array unit can be hill-shaped, square, triangular, groove, etc.; the arrangement form can be square array, triangular array , strip grooves, etc., the center spacing is 10-500 μm, and the height is 5-500 μm. Then, thermal oxidation treatment is performed on these microstructure surfaces to obtain micronanostructure surfaces with different microstructure basic shapes. During the steam condensation process, the condensing surface with different morphological characteristics has different control effects on the condensed droplets. Therefore, the microstructure can be customized according to the d...

Embodiment

[0064] Example A method for preparing a copper-based superhydrophobic surface with controllable micro-nano structure

[0065] This embodiment provides a method for preparing a copper-based superhydrophobic surface with controllable micro-nano structure, such as figure 1 As shown, the steps are as follows:

[0066] (1) Surface pretreatment. The copper sheet (purity 99.9%, size 40×40×2mm 3 ) was polished with 2000-grit sandpaper, and then the sample was ultrasonically cleaned in acetone for 10 minutes. After taking it out, it was washed with isopropanol, ethanol and deionized water in sequence, and dried with nitrogen.

[0067] (2) Laser etching. Adopt Edgewave PX100intelliSCANSe14 picosecond laser, the laser center wavelength is 1064nm, the repetition frequency is 597.44KHz, the full power is 60% (full power is 65.4W), the focal length of the galvanometer is 100mm, the array spacing is 55μm, and the scanning speed is 3m / s. The number of repetitions is 30 times, and the sur...

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Abstract

The invention discloses a micro-nanostructure controlled copper-based superhydrophobic surface and a preparation method and application thereof. The copper-based superhydrophobic surface comprises micro structure arrays and nanowires, wherein center spacing of the micro structure arrays is 10 to 500[mu]m, the height of each micro structure array is 5 to 500[mu]m; the nanowires have the diameter of 40 to 200nm, the length of 2 to 50[mu]m and average spacing of 0.1 to 3[mu]m; and the nanowires grow in parallel to the direction of a local normal of the copper-based superhydrophobic surface and has the ingredient being copper oxide. The copper-based superhydrophobic surface can implement liquid droplet bouncing heat exchange of water vapor condensation and can also promote classical droplet condensation so as to reinforce heat exchange. Moreover, the micro-nanostructure controlled copper-based superhydrophobic surface can also be used for the fields of self-cleaning, corrosion resistance, ice prevention, frosting resistance and the like.

Description

technical field [0001] The invention relates to the fields of surface science and engineering, surface modification, heat exchange, etc., and specifically relates to a super-hydrophobic surface material based on copper metal, with controllable micro-nano secondary structure and without artificial chemical modification, and a preparation method thereof. Background technique [0002] A superhydrophobic surface is generally defined as a surface with a water contact angle greater than 150° and a roll-off angle less than 10°. This surface can prevent water from wetting on the surface, so it behaves as "drip and non-stick", and has a self-cleaning effect like a lotus leaf in nature. In the field of energy and heat transfer, the superhydrophobic surface can effectively improve the efficiency of condensation and heat transfer, and also has the functions of anti-icing and anti-frost. [0003] Currently, for conventional intrinsically hydrophilic substrate materials such as copper, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B81B1/00B81C1/00
CPCB81B1/00B81C1/00031
Inventor 陈凤颜笑黄志勇薄涵亮董玉杰
Owner TSINGHUA UNIV
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