Method of constructing graphical magnetic micro-nano structure through laser beam direct writing

Abstract

The invention provides a method of constructing graphical magnetic micro-nano structures through laser beam direct writing, wherein the method includes the following processes: (1) at least spreading more than one layers of magnetic material particles on a surface of a substrate, and then applying a controllable magnetic field so that the magnetic material particles are arranged orderly according to magnetic lines on the magnetic field on the surface of the substrate; (2) by means of the laser beam entering from one side of the back side of the substrate to scan the substrate, wherein the position irradiated by the laser beam absorbs laser energy so that the position is subjected to rapid temperature increasing, so that the irradiated position on the back side of the substrate is free of being molten or subjected to thin-layer melted while the parts on the magnetic material particles on the front side of the substrate is partially melted, and finally cooling the substrate to achieve welding between the magnetic material particles to the substrate; and (3) repeatedly doing the step (1) and the step (2) to prepare the micro-nano structure being multilayered, being different in size and being order. The method is used for preparing the graphical magnetic micro-nano structure, wherein the size and the shape of the micro-nano structure are controlled, so that super-hydrophobic property, electromagnetic wave absorption and reflection characters of the surface can be adjusted and controlled.

Description

technical field [0001] The invention belongs to the field of laser processing, and in particular relates to a method for constructing patterned magnetic micro-nano structures by direct writing of laser beams. Background technique [0002] After hundreds of millions of years of natural evolution, the surfaces of animals and plants in nature have gradually formed special structural forms. These special structural forms endow the surfaces of animals and plants with unique and excellent functional properties, such as superhydrophobicity, self-cleaning effect, etc. . There are many animal and plant surfaces with superhydrophobic properties in nature, among which lotus leaves, water strider legs, rice leaves, butterfly wings and rose petals are typical representatives of biological superhydrophobic surfaces. Generally, there are two methods for the preparation of biomimetic superhydrophobic surfaces: one is to construct rough structures on inherently hydrophobic solid surfaces, s...

AI Technical Summary

Problems solved by technology

However, compared with the metal surface, the thermal and mechanical stability of the organic chemical modification layer is poor, and it is easily damaged in an extremely harsh environment, resulting in the loss of superhydrophobicity on the metal surface.

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