Cross-species Bioinspired Functional Microstructures And Their Applications Based On Femtosecond Lasers

In the environment of natural selection and survival of the fittest,natural organisms have evolved their own unique survival skills.Although people have prepared various bionic surface structures by different processing technologies,to achieve specific functions to serve the human society.However,the research on some important issues remains extremely challenging.In this paper,based on femtosecond laser material removal and template transfer technology,focusing on some important issues which need to be solved in scientific research and practical application.The bionic magnetic-controlled deformation structures are fabricated to study magnetically controlled deformation mechanism and the local deformation controllability of the structures.We reported the design and fabrication of magnetic anisotropic cross-species bionic structure and tunable cross-species bionic structure,and the non-gravity horizontal transport of droplet on the anisotropic surface and the reversible switch of multiple wetting states on the same structure surface are achieved respectively.1.Based on the research results on the controllability of the chain-like arrangement of iron particles in PDMS films,a single magnetic-controlled structure is prepared by combining with the processing advantages of femtosecond laser micro-nano technology.The deformation characteristics of a single structure are studied under magnetic field.Then,the magnetically controlled assembled deformation structure and the integrated quasi-three-dimensional deformation structure are constructed from two distinct perspectives.The magnetic-controlled deformation between the assembled two-dimensional structures and the reversible deformation between two-dimensional structures and two-dimensional structures are realized.The integral magnetic-controlled deformation of the integrated quasi-three-dimensional deformation structure is realized.On this basis,a new method to accurately control the local deformation of the structure is proposed.2.Adopted to the cross-species bionic design strategy,the structure consists of anisotropic high-aspect ratio magnetically responsive microcolumn array is prepared by femtosecond laser material removal and template transfer technology.Under the moving magnetic field,the unidirectional waves are formed by the real-time reconstruction of the microcolumn array,which can promote the directional and stable transport of droplets along the predetermined orbit.Through the anisotropic design of the structure,the accurate control of droplet directional and stable transport is realized.Experimental results show that the directional transport of the droplet is not affected by changing the droplet temperature and pH.In addition,the non-gravity-driven horizontal transport of the droplets on the inclined surface is innovatively achieved.3.Using femtosecond laser material removal and template transfer printing technology,an in-situ tunable cross-species bionic magnetic-controlled structure with triple reversible switchable wettability is proposed.By a simple method of stretching and self-relaxation,the surface geometry is reconstructed,and reversible switching between three wetting states of lotus leaf-like surface effect,rice leaf-like anisotropy and rose petal-like pin effect is achieved on the same surface structure.Based on the multi-wetting characteristics of the structure,the multi-functional applications of the structure are further demonstrated,including self-cleaning of the surface,droplet capture,transport and release of droplet.