Method for controlling reversible transformation of hydrophilic-hydrophobic properties of folded surfaces by strain and application

Abstract

The invention relates to a method for controlling reversible transformation of hydrophilic-hydrophobic properties of folded surfaces by strain and an application. The method has the characteristics that a layer of 'hard' thin film is formed on the surface under a drawing state by carrying out drawing on a substrate made of flexible materials (flexible polymers such as PDMS (polydimethylsiloxane) and PI (polyimide)), homogeneous and ordered sinusoidal type folds are formed on the surface of the material by releasing drawing stress after the 'hard' thin film is formed, then the sinusoidal type folds are continuously drawn in a step-by-step manner, and contact angles are tested under different drawing lengths, so that the purpose of controlling the reversible transformation of the hydrophilic-hydrophobic properties of the surfaces is achieved. Folds with different periods and vibration amplitudes can be formed by changing the initial drawing length and the film plating thickness, and the control for the hydrophilic-hydrophobic properties in different ranges can be achieved. The method has the advantages of no toxicity and harm, simple operation, wide application range, good reversible property and the like.

Description

technical field [0001] The invention relates to a method for changing the surface morphology of materials by using strain, thereby changing the hydrophilicity and hydrophobicity, belonging to the field of surface wettability of materials. Background technique [0002] In recent years, with the in-depth research on the wetting properties of material surfaces, its applications in microfluidic pipelines, self-cleaning devices, biomedical engineering, robotics, and water resource collection have become more and more extensive. It is well known that the wetting behavior of a material surface is mainly determined by its chemical composition and surface geometry (such as roughness); as the surface free energy decreases, the hydrophobicity of the surface will increase. However, even It is the smoothest surface, and its contact angle can only reach 120°. Therefore, it is particularly important to change the hydrophobicity by changing the surface morphology of the material surface. I...

AI Technical Summary

Problems solved by technology

The above-mentioned methods have the following disadvantages: 1. The preparation process is complicated and the preparation cycle is relatively long; 2. The hydrophobic surface formed is a fixed value and cannot be adjusted

[0005] To sum up, the above method has poor controllability and complex preparation process with long cycle time. Therefore, it is necessary to establish a scientific, non-toxic, harmless, highly controllable, reversible and good cycle stability reversible change of hydrophilicity and hydrophobicity on the wrinkled surface. control method

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