A method for preparing the surface texture of super-oleophobic micropillar arrays

Abstract

The invention discloses a preparation method for a super-oleophobic micro-cylindrical array surface texture. The preparation method comprises the following steps: S1, cleaning and drying a metal substrate; S2, homogenizing photoresist, and carrying out pre-baking pre-curing on the photoresist; S3, exposing the photoresist, placing a mask with a special hollow-out pattern above the photoresist, and copying the mask pattern to the photoresist; S4, carrying out developing and post-baking of the photoresist, so that a microhole array is generated on the photoresist; S5, carrying out primary electroforming on a micro-cylindrical array to generate a metal micro-cylindrical array; S6, removing photoresist with certain thickness, and exposing local top end parts of all micro cylinders; S7, carrying out secondary electroforming on the micro-cylindrical array to form a super-oleophobic nail cap structure; carrying out wet-process complete photoresist removal; and carrying out low surface energy modification. According to the preparation method, the straight-body micro-cylindrical array is formed by electroforming after constructing the microhole array by use of the photoresist, part of the photoresist is removed to expose the micro-cylindrical top, and secondary electroforming is carried out to construct a micro-cylindrical cap body, so that the super-oleophobic surface texture which is uniform, regular and suitable for large-scale forming is constructed.

Description

technical field [0001] The invention relates to the technical field of micro-textures, in particular to a method for preparing the surface texture of a super-oleophobic micro-column array. Background technique [0002] Wettability is a common phenomenon in nature. For example, the phenomenon that rainwater falls on the surface of lotus leaves to form spherical droplets and rolls down, and the self-cleaning effect of lotus leaves "out of silt without staining", which is the phenomenon of superhydrophobicity. In addition, many animals and plants, such as the feet of water striders, the wings of butterflies, and rice leaves, also have superhydrophobic properties. Studies have shown that the superhydrophobic properties of all these surfaces are formed due to the combined action of micro-nano rough structures and low surface energy substances. [0003] Wettability is also an important aspect in the fields of material science and surface engineering, and has many important applic...

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Problems solved by technology

[0007] The above methods have the following corresponding defects: (1) template-free wet etching can etch silicon and metal surfaces, with high efficiency and low cost, but the controllability of the etched surface morphology is poor. This method is easy to obtain a super-hydrophobic surface. But it is not easy to obtain a super-oleophobic surface; the oleophobic surface can be obtained by Bosch etching method, but the process is complex and only suitable for silicon materials

(2) The femtosecond laser etching method can prepare micro-nano nested structure surface with high precision and regular shape, but the process efficiency is low, it is not suitable for large-scale manufacturing, and the equipment is extremely expensive

(3) The electrospinning method uses micro / nano filaments to construct a rough structure on the surface, and it is easy to control the required structure of the oleophobic surface, but the prepared surface has poor mechanical properties and does not have good wear resistance, etc. , the service life is relatively short; (4) The electrodeposition method can deposit metals or polymers, which can efficiently and conveniently prepare surfaces with micro-nano rough structures, but the morphology is highly random and difficult to control, and it is not easy to produce concave or cantilever structures

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