A Calculation Method of Droplet Contact Angle Under Given Surface Secondary Micro-Nano Structure

Abstract

The invention discloses a liquid drop contact angle calculation method under a given surface second-level nano-micro structure. The calculation method comprises the following steps: adopting a nano-micro geometric measuring instrument to measure the structure size of the given second-level nano-micro structure to obtain the side length, the space and the height of the nano-micro structure; adopting general assumptions in Young equation, Wenzel equation and CB equation deduction, and calculating a roughness factor and an area fraction under micrometer and nanometer size under the assumptions; according to different infiltration states under a micrometer structure and a nanometer structure, dividing the infiltration states of the second-level nano-micro structure into four situations, and inducing and simplifying the system free energy calculated modes of four given surface second-level nano-micro structures; and in virtue of a C++program compiling module in Visual Studio2012 software, applying a Soushan method to calculate the system free energy under different infiltration states, finding interface minimum free energy under a stable state, and obtaining a contact angle corresponding to the interface minimum free energy.

Description

technical field [0001] The invention relates to a method for obtaining the contact angle of a droplet under a given surface secondary micro-nano structure by using free energy calculation and mountain search method. Background technique [0002] The contact angle refers to the angle between the tangent of the gas-liquid interface at the intersection of the solid-liquid-gas triple point and the solid-liquid boundary line. It is an important parameter that characterizes the wettability of a liquid to a solid. Through the study of contact angle, many information about the interaction of solid, liquid and gas molecules can be obtained, such as surface wettability, surface roughness, solid-liquid interfacial tension, etc. Therefore, accurate acquisition of contact angle is very important for the study of superhydrophobic materials, research The condensation process of droplets and the development of water collection equipment are of great significance. At present, the contact an...

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Problems solved by technology

At present, the contact angle measurement technology is mainly based on experimental research, which is mainly divided into angle measurement method, force measurement method, length measurement method and penetration method. However, the above methods all have the disadvantages of complex measurement devices and large influence of human operation factors. Therefore, researchers have been working hard to explore better contact angle measurement techniques.

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