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Steady ultra-hydrophobic surface controllable design method based on geometric analysis

A technology of super-hydrophobic surface and geometric analysis, applied in the field of controllable design of stable super-hydrophobic surface, can solve problems such as the calculation method of critical height without in-depth study, and achieve the effect of wide practicability, strong controllability and easy operation

Inactive Publication Date: 2008-09-03
JIANGSU UNIV
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Problems solved by technology

[0010] There are few studies on the C / W conversion of microstructured surfaces from the geometric point of view. In recent years, W.Li and A.Amirfazli have done some work in this area. The critical height (h c ) concept, and from a geometric point of view, a comprehensive criterion for the wetting mode conversion of droplets occurs (that is, h>h c ), but they did not study the calculation method of the critical height in depth, nor did they use this criterion as a criterion for superhydrophobic stability
It can be seen that the research results have certain limitations

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  • Steady ultra-hydrophobic surface controllable design method based on geometric analysis
  • Steady ultra-hydrophobic surface controllable design method based on geometric analysis
  • Steady ultra-hydrophobic surface controllable design method based on geometric analysis

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Embodiment Construction

[0025] The details of the technical solutions proposed by the present invention will be described below by taking parallel grating-shaped microstructured surfaces and circular pit-shaped microstructured surfaces as examples.

[0026] (1) Parallel grating microstructure surface

[0027] Theoretical prediction formula of apparent contact angle is deduced first. Figure 1 is a schematic diagram of a parallel grating-shaped microstructure model and its parameter design. The geometric parameters involved include grating width a, spacing (ie, groove width) b, and groove depth h. Select the area inside the dotted line box on the right of the figure as a period for analysis, choose the length of the grating direction as l, according to r and f 1 The definition of is: r=[(a+b) l+2h l] / [(a+b) l]=1+2h / (a+b), f 1 =(a·l) / [(a+b)·l]=a / (a+b). Substitute into formula (1) and formula (2) respectively to get:

[0028] cos θ r W ...

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Abstract

The invention provides a stabilizing ultra-hydrophobic surface controllable design method based on geometric analysis, relating to the fields of material research modeling and simulating material (compute) design, which is characterized in that firstly establishing parallel grating shaped or circular pit and other regular shaped microstructure surface model, according to the established microstructure feature, deriving the apparent contact angle theory predictor formula of the liquid droplet on the microstructure surface based on Wenzel theory and Cassie theory; at the same time, analyzing the C / W converting process on the microstructure surface from the geometric angle; then, pre-designing the geometric parameter of the established microstructure surface model, calculating the apparent contact angle of the liquid droplet on the microstructure surface by the apparent contact angle theory predictor formula derived above, determining whether the designed microstructure surface has ultra-hydrophobicity; at last, calculating h0 of pre-designed microstructure geometric parameter and the corresponding apparent contact angle derived from calculation, judging whether the designed microstructure surface has ultra-hydrophobic stability. The invention is direct viewing, and is easy to operate, which has strong controllability.

Description

technical field [0001] The present invention relates to the field of material research modeling and simulation, and material (calculation) design, and in particular refers to a method for realizing the controllable design of a stable superhydrophobic surface by theoretically analyzing the wetting mode conversion process of the microstructure surface from a geometric point of view. It can be applied to surfaces with regular microstructures such as parallel gratings and circular pits. Background technique [0002] Wettability is one of the important characteristics of solid surfaces, which is jointly determined by the chemical composition and microstructure of the surface. In the research on the "lotus leaf effect" of biological surfaces, it was found that many biological surfaces have a hierarchical structure combining micrometers and nanometers. The root cause of hydrophobic properties. Following the example of nature, the superhydrophobic performance of the material surfa...

Claims

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Application Information

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IPC IPC(8): G01N13/00G06F17/50
Inventor 李保家周明蔡兰
Owner JIANGSU UNIV
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