A dry adhesive pad based on van der Waals force effect and its manufacturing method

Abstract

The invention relates to a dry adhesion pad based on the Van der Waals force effect and a manufacturing method thereof. The method comprises the following steps of depositing a thin film on the surface of a wedge-shaped concave die, wherein the wedge-shaped concave die is provided with a plurality of inclined wedge-shaped grooves; casting an elastic adhesive material into the wedge-shaped concavedie, and carrying out curing at room temperature; and moving the elastic adhesive material out of the wedge-shaped concave die so as to obtain an inclined wedge-shaped array on the surface of the elastic adhesive material, namely the dry adhesion pad based on Van der Waals force effect. According to the dry adhesion pad based on the Van der Waals force effect and the manufacturing method thereof,the adhesion pad with low pre-load, high adhesion and easy desorption characteristics can be prepared by depositing the thin film on the surface of the wedge-shaped concave die with the multiple inclined wedge-shaped grooves, casting the elastic adhesive material into the wedge-shaped concave die, then carrying out curing at room temperature and moving the elastic adhesive material out of the wedge-shaped concave die.

Description

Technical field [0001] The invention relates to the technical field of artificial dry adhesion, in particular to a dry adhesion pad based on van der Waals force effect and a manufacturing method thereof. Background technique [0002] With the continuous in-depth study of bionics by scientists, it was discovered that gecko, as the most massive animal known to have the ability to move without obstacles in all spaces, its foot (pad) adhesion mechanism has aroused great interest of scientists. In 2000, the FULL team in the United States tested the adhesion of a single bristle on the sole of the gecko, and proved that the adhesion between the bristles on the sole of the gecko and the surface of the object is achieved by the van der Waals force between molecules. They believe that although the van der Waals force is small, when the number of bristles in contact with the contact surface is large enough, the accumulated force is sufficient to support the weight of the gecko's entire body...

AI Technical Summary

Problems solved by technology

[0004] However, the shape of bristles is the main factor affecting the performance of dry adhesive pads. Compared with other bristle shapes, dry adhesive pads with wedge-shaped bristle arrays are more in line with the application requirements of low preload and easy detachment. The bristle length, aspect ratio Geometric parameters such as , inclination angle have a significant impact on the adhesion performance, but the research in this area at home and abroad is still very preliminary. How to improve the performance of wedge-shaped bristles with low preload, high adhesion and easy desorption is the core issue that needs to be further studied.

[0005] In short, most of the existing adhesive pads do not have an anisotropic structure, that is, they do not have easy detachability.

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