Bionic gradient super-hydrophobic structure design method based on Marangoni effect
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A structure design, super-hydrophobic technology, applied in design optimization/simulation, nanotechnology for materials and surface science, special data processing applications, etc., can solve the uncontrollable dynamic behavior of droplets on the surface of super-hydrophobic structures, which cannot be effectively Realize the directional movement of droplets and the self-cleaning of the automatic rolling surface
Active Publication Date: 2021-03-12
JILIN UNIV
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[0011] The purpose of the present invention is to provide a bionic gradient superhydrophobic structure design method based on the Marangoni effect, to solve the uncontrollable dynamic behavior of droplets on the surface of the existing superhydrophobic structure, which cannot effectively realize the directional movement and automatic rolling of droplets, thereby surface self-cleaning problem
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Embodiment 1
[0050] Embodiment 1: Cylindrical array structure
[0051] The roughness factor r and the solid area fraction f in the composite interface:
[0052]
[0053] Let the period interval be The aspect ratio is
[0054] Substitute r and f into the Wenzel model formula:
[0055]
[0056] Substitute r and f into the Cassie model formula:
[0067] Let the equation of the parabola be y=ax 2 +b(a<0)
[0068] Because the height of the parabolic rotating structure is H and the diameter is D, so b=H
[0069]
[0070] When the droplet is in Cassie state in contact with the solid surface, the bottom of the droplet is in contact with the top part of the parabolic rotating structure, and the contact depth h′ is determined by the intrinsic contact angle θ between the droplet and the solid e depends.
[0071] Since the size of the droplet is much larger than the size of the parabolic rotating structure, its bottom can be regarded as a straight line in myopia, and the solid-liquid contact can also be regarded as a small paraboloid with a base radius of a' and a height of h'.
[0072] Since y=ax 2 +b, so at the solid-liquid interface there are:
[0073]
[0074] Combine the above two formulas to get:
[0075] So the area of the small paraboloid is:
...
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Abstract
The invention relates to a bionic gradient super-hydrophobic structure design method based on the Marangoni effect, and belongs to the technical field of micro-nano structure functional surface designand preparation. The method includes: single surface array structure is firstly constructed according to the characteristics of the hydrophobic surface structure, and the contact angle of the surfacestructure is calculated in combination with a Wenzel and Cassie model; different single array structures with the same parameters are constructed, the contact angles of all the structure models are compared, a structure sequence is constructed according to the contact angles, the structure parameters are finely adjusted, and then the structure sequence is constructed to form a continuous gradientcomposite array structure; a nanometer heating sheet is installed on a single structure, different temperature values are set to form a temperature gradient, and under the coupling of the structure gradient and the temperature gradient, due to the change of surface tension, liquid drops spontaneously move from a surface with a large contact angle to a surface with a small contact angle. Therefore, the surface tension difference caused by the Marangoni effect promotes directional movement and automatic rolling of the liquid drops, so that the self-cleaning characteristic is realized.
Description
technical field [0001] The present invention relates to the technical field of micro-nano structure functional surface design and preparation, in particular to a method for designing a bionic gradient superhydrophobic structure based on the Marangoni effect. The surface structure design method of rolling is suitable for the design and analysis of the microstructure that prevents the substances in the droplets from being adsorbed on the solid surface and has self-cleaning properties. Background technique [0002] Many devices or equipment in modern life need to be partially or completely in a liquid environment due to work requirements, and the liquid often contains various substances, some substances will chemically react with these devices or equipment, and some substances will be adsorbed on these devices or equipment The surface thus affects or even damages its work. Therefore, we need to improve these solid surfaces to improve the efficiency of equipment and meet our ev...
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