A Method for Obtaining Droplet Contact Angle on Regular Second-Order Structured Surface

A technology of structured surface and acquisition method, applied in instrumentation, design optimization/simulation, calculation, etc., can solve the problems of large result error and complicated process of measuring contact angle of solid surface.

Active Publication Date: 2019-09-20
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to achieve the above purpose, the embodiment of the present invention provides a method for obtaining the contact angle of a droplet on a surface with a regular second-order structure, which solves the defects of the experimental measurement process of the solid surface contact angle and the large error in the actual application.

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  • A Method for Obtaining Droplet Contact Angle on Regular Second-Order Structured Surface
  • A Method for Obtaining Droplet Contact Angle on Regular Second-Order Structured Surface
  • A Method for Obtaining Droplet Contact Angle on Regular Second-Order Structured Surface

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Embodiment

[0157] (1) In order to ignore the influence of gravity on the contact angle of the droplet on the solid surface, the volume of the droplet is taken as V=5μl, and the intrinsic contact angle of the material forming the second-order structure, that is, Young’s contact angle, is taken as θ Y =105° (different materials correspond to different intrinsic contact angles).

[0158] The geometric structure size parameters of the second-order structure are: the side length, spacing, and height of the top nanopillars are respectively a 1 =100nm,b 1 =90nm, h 1 = 200nm, the side length, pitch and height of the microcolumn are respectively a 2 =10μm,b 2 =9μm,h 2 =20μm, the side length, spacing and height of the bottom nanopillars are respectively a 3 =100nm,b 3 =90nm, h 3 = 200nm.

[0159] (2) For two different droplet infiltration modes in the second-order structure, the increment of the infiltration depth z is five percent of the length of each infiltration interval; for formula (...

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Abstract

The invention discloses an acquiring method for a regular second-order structure surface liquid drop contact angle. The method comprises steps of deduction of a fundamental assumption of any three-dimensional structural model thermodynamic analysis and a system relative free energy function, sweeping from the top to the bottom end of a second-order structure to elicit relative free energy function of a system under different segments according to differences of an infiltration model and infiltration depth of a liquid drop along a depth direction of the second-order structure, programming a second-order structure volume geometric constraint condition and the relative free energy function via Matlab software, seeking relative free energy of the system under different infiltration models and infiltration depths in a segmental way, and determining a system minimum free energy and a stable wetting state to achieve a relative balance contact angle. The acquiring method solves deficiencies of redundant test measuring process of solid surface contact angle and great result error in the practical application.

Description

technical field [0001] The invention belongs to the technical field of micro-nano composite structures, and relates to a method for obtaining the contact angle of liquid droplets on the surface of a regular second-order structure, in particular to a method for obtaining a regular second-order structure by calculating the relative free energy of a solid-liquid-gas three-phase contact system The droplet contact angle on the surface. Background technique [0002] Wettability is one of the important properties of solid surfaces and a common interfacial phenomenon. Due to the difference in wettability of solid surfaces, many functional surfaces will be produced, such as waterproof textiles, microfluidic devices, and dust-proof self-cleaning surfaces, etc., which play an important role in human daily life and industrial production. In general, the wettability of a solid surface is characterized by the contact angle of a liquid drop on it. The contact angle refers to the angle be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 翁灿王飞杨冬娇蒋炳炎
Owner CENT SOUTH UNIV
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