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Stable superhydrophobic surface design method for periodically arranged microcolumn structure

A technology of super-hydrophobic surface and structured surface, which is applied in calculation, volume measurement, liquid/fluid solid measurement, etc. It can solve problems that have not been seen, and achieve the effect of easy design method and convenient and fast design process

Active Publication Date: 2016-05-04
DALIAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is no design condition for the height of the microcolumn that can stably maintain the surface of the microcolumn structure in the Cassie state.

Method used

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  • Stable superhydrophobic surface design method for periodically arranged microcolumn structure
  • Stable superhydrophobic surface design method for periodically arranged microcolumn structure
  • Stable superhydrophobic surface design method for periodically arranged microcolumn structure

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Experimental program
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Effect test

Embodiment 1

[0041] A. Establish a periodic arrangement of micro-column structure models, such as image 3 shown;

[0042] B. Establish the theoretical criterion for maintaining a stable Cassie state, that is, derive the critical height formula (7) or (8) on the surface of the periodically arranged micro-column structure;

[0043] C. Geometric parameters of the surface of the pre-designed micropillar structure a=50 μm, l=100 μm, h=100 μm, θ=120°. According to the formula The calculated apparent contact angle is 151° greater than 150° for the next step.

[0044] D. Calculate the critical height of 37.5 μm according to formula (7). The height of the pre-designed micro-column structure is greater than the critical height, and the Fluent software is used to simulate the static drop and dynamic rebound, and both can be maintained in a stable Cassie state, such as Figure 4 and 5 shown. Proceed to the next step.

[0045] E. Experimental preparation is carried out according to the pre-des...

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Abstract

The invention provides a controllable design method for a stable superhydrophobic surface of a microcolumn structure. A critical height criterion for a liquid drop to form a stable Cassie state is proposed from the perspective of a minimum energy principle and can serve as a theoretical criterion for the preparation of a stable superhydrophobic microstructure. The critical height is calculated to perform theoretical prediction on whether the stable Cassie state can be formed or not, so that the controllable design of the stable superhydrophobic surface is realized. The surface soaking performance of the designed microcolumn structure is verified through Fluent software numerical simulation of static sessile drops and dynamic residence of the designed microcolumn structure. The superhydrophobic surface design method for the periodically arranged microcolumn structure, proposed by the invention, considers the influences of the microcolumn height, the microcolumn spacing, the microcolumn bottom surface edge length and an intrinsic contact angle on the surface hydrophobic performance of the microcolumn structure at the same time, and relates to the fields of superhydrophobic design, material simulation and the like; a design process is convenient and quick; and the design method is easy to master.

Description

technical field [0001] The invention belongs to the field of super-hydrophobic surface design, and relates to a design method for realizing a stable super-hydrophobic surface by designing the height of micro-columns on the surface of periodically arranged micro-column structures, which is applicable to the stable super-hydrophobic surface of periodically arranged micro-column structures. control design. Background technique [0002] Superhydrophobic surface refers to a typical micro-nano structured surface with a static contact angle greater than 150° and strong hydrophobicity. In the long-term evolution process of organisms, through natural selection, such material surfaces with unique configuration and excellent performance have been formed, such as the legs of water striders and the surface of lotus leaves. The trapped air layer in this type of microstructure can effectively reduce the contact between liquid and the surface, thereby realizing multiple functions, such as ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01F15/00
CPCG01F15/006G06F30/13
Inventor 张伟张润润吴承伟马建立
Owner DALIAN UNIV OF TECH
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