Method for designing stable superhydrophobic surface of grating structure

A super-hydrophobic surface and grating structure technology, applied in the direction of surface/boundary effects, calculation, special data processing applications, etc., can solve problems such as state transition without in-depth study of critical depth calculation methods

Inactive Publication Date: 2010-09-01
JIANGSU UNIV
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Problems solved by technology

In 2007, LiW et al. analyzed the stability of superhydrophobic phenomena on the surface through geometric analysis methods. They proposed the concept of critical depth to explain the influence of depth on state transition, but they did not study the calculation method of critical depth and other factors. state transitions, so there are some limitations to their findings
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  • Method for designing stable superhydrophobic surface of grating structure
  • Method for designing stable superhydrophobic surface of grating structure
  • Method for designing stable superhydrophobic surface of grating structure

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Embodiment 1

[0030] Embodiment 1 (contact angle is 150 °, intrinsic contact angle and advancing contact angle are 110 °, solid-liquid interface pressure difference is 1kPa, γ lg =72mN / m)

[0031] According to the requirement of contact angle and formula (3), the parameter f=0.2036 in formula (2) can be obtained. Then the structural parameters a=100 μm and b=25.07 μm are pre-designed according to formula (3). After determining the parameters a and b, according to the working state of the liquid (the internal pressure of the liquid P l ) and the Laplace deformation formula (4) determine the angle α between the liquid surface and the groove wall = 134.0°. The angle is as figure 2 As shown, at the same time, formula (5) is used to calculate the distance h=20.19 μm from the lowest point of the liquid surface to the top of the protrusion as shown in the figure. Since α>θ A , the liquid is unstable on the superhydrophobic surface, and the state transition from Cassie mode to Wenzel mode wil...

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Abstract

The invention provides a method for designing a stable superhydrophobic surface of a grating structure, and relates to the field of the design research of the superhydrophobic surface. The method comprises the following steps of: first, deducing the relationship between the structure parameter of the surface of the grating structure and the superhydrophobic performance requirement of the surface, and determining the structure parameter of the surface according to the relationship; then, calculating a contact angle formed by the liquid level inside a surface groove and the groove wall according to working conditions of liquid, and simultaneously calculating the distance from the lowest point to the bump top of the liquid level; and finally, determining the state of the liquid on the surface through the calculated contact angel and distance, and adjusting the parameter if the liquid is in a Wenzel state so as to realize stable superhydrophobic performance. The stable superhydrophobic surface is designed by a geometric analysis method according to the micro-contact form of the liquid and the microstructure surface so as to ensure visualization of the design process.

Description

technical field [0001] The invention relates to the research field of super-hydrophobic surface design, in particular to a design method for realizing a stable super-hydrophobic surface through geometric analysis of contact state transition on a grating microstructure surface, which is applicable to the controllable design of a grating structure-stabilized super-hydrophobic surface. Background technique [0002] The superhydrophobic phenomenon is the phenomenon that water droplets exhibit a large contact angle (contact angle CA>150°) on the surface, and the surface that can produce superhydrophobic phenomenon is called superhydrophobic surface. Due to its unique superphobic effect, superhydrophobic surfaces have great application prospects in surface self-cleaning and surface drag reduction, and have received extensive attention. [0003] The superhydrophobic surface is actually obtained by modifying the structure and properties of the surface. Liquids have two contact m...

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Application Information

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IPC IPC(8): G01N13/00G06F17/50
Inventor 周明李健李保家蔡兰
Owner JIANGSU UNIV
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