Study On Construction And Functionalization Of Morphgenetic Biomimetic Superhydrophobic Wood

Nature is not only a school for human beings,but also a treasure trove of structures unified with materials.To take wettability as an example,people have disclosed many functional interfacial materials,such as“lotus effect”and“petal effect”.Inspired by the nature’s morphology plant,learn from nature,building a new type of biomimetic morphology functional superwetting characteristics of wood.Bioinspired surfaces of natural organisms with superwettability,are biomimetic morphology superhydrophobic wood surface with micro nano morphological structure to create function interface has been designed and fabricated using nanoimprint technology.It aims to build a bridge for cross–synthesis of subjects of wood science and bionic science,so as to extend the research of wood intellectualized biomimetic technology and applied technology to the field of wood science research.The application scope of functionalized superhydrophobic wood is widened and the utilization value of wood is increased.A variety of functional morphology biomimetic superhydrophobic coatings have been constructed based on the concept of biomimetic morphology,and their corresponding performance was investigated,respectively.The main results are shown as following:1.Bio–inspired by the red rose petals,morphology biomimetic superhydrophobic wood was prepared through the template imprint method,which it gives the wood a high adhesion superhydrophobic property.The as–prepared morphology biomimetic superhydrophobic wood does not change the basic performance of wood,but has a high adhesion superhydrophobic property;the static WCA of the morphology biomimetic superhydrophobic wood is about 157.5°±0.5°,which it can be prevented the wood absorbing moisture;and has excellent thermal stability.2.Bio–inspired by the petals effect,robust,buoyant,superhydrophobic PVB/SiO₂coatings were successfully formed on wood surface through an one–step solvothermal method and a nanoimprint lithography method.The morphology biomimetic superhydrophobic PVB/SiO₂ wood not only exhibited a robust superhydrophobic performance with a WCA of 160°but also had excellent durability and thermostability during the sand abrasion tests and against corrosive liquids.Additionally,the as–prepared morphology biomimetic PVB/SiO₂/wood show high buoyancy.3.Bio–inspired by the lotus effect,a robust superhydrophobic coating was formed on wood surface through a process combining hydro–deposition,nanoimprint lithography and subsequent modification with fluoroalkyl silane.The as–prepared morphology biomimetic superhydrophobic TiO₂/FAS–17 wood had a papillary micro/nanostructure.The WCA was 155°and the roll–off angle was 6°.The robust superamphiphobic performance was measured and evaluated by sand abrasion tests.4.Bio–inspired by the lotus effect,morphology of lotus leaf–like micro–nanostructures was prepared on wood surface by nanoimprint lithography technology.And as–prepared morphology biomimetic lotus leaf–like wood with lotus–leaf–like micro/nano–papilla structure not only does not change the original color texture of the original wood,but has a self–cleaning superhydrophobic performance,with a contact angle of 151°and roll–off angle of 6°.Meanwhile,graphite powder on the surface can be easily washed away by water droplets,showing self–cleaning performance.5.Bio–inspired by the canna leaf,the micro/nano–biomimetic structures were successfully replicated on wood surfaces by nanoimprint lithography technology.By contrast,as–prepared morphology biomimetic canna–leaf–like self–cleaning superhydrophobic wood not only exhibited self–cleaning superhydrophobic performance with a water contact angle（WCA）of 155°and the surface exhibits excellent self–cleaning ability with sliding angle of 6°,but also possess thermally stable properties.In addition,it exhibited stable superhydrophobicity even after being immersed in various p H for 1h,indicating the excellent anti–corrosion property.Besides the superhydrophobic robust performance under sand abrasion tests,but the contact angles lower than the as–prepared morphology biomimetic canna–leaf–like self–cleaning superhydrophobic wood.Meanwhile,the as–prepared morphology biomimetic canna–leaf–like self–cleaning superhydrophobic wood also presented superior water–resistant,UV resistant,and high–temperature–humidity–resistant properties.6.Bio–inspired by the rice leaf,using Zizania leaf as an master and PDMS prepolymer material as the imprint,through nanoimprint technology and silanization graft modification treatment,the micro–nano groove edge structure on the surface of Zizania leaf,which is built on wood surface to obtain a biomimetic morphologies anisotropic superhydrophobic wood.The as–prepared biomimetic morphology anisotropic superhydrophobic wood has a superhydrophobic performances,with a contact angle of 158°.In addition,when the water droplets on the surface of samples were inverted to the direction of the vertical groove,the water droplets adhered to the surface of the sample without dripping,and the water droplets quickly rolled down when inverted to the direction of the flat groove.It has anisotropic superhydrophobic lines;it still shows superhydrophobicity after sandpaper abrasion.The contact angle of water was greater than 150°after 2 hours of sub–treatment,and the super–hydrophobicity was still maintained,indicating that the sample has good stable wettability to extreme environments such as high temperature and low temperature.7.Bio–inspired by the biomineralization of Nacre,the Polydimethylsiloxane（PDMS）and SiO₂ coatings were fabricated on the wood surface by drop–coating method.The as–prepared biomimetic morphologies self–assemble SiO₂–PDMS superhydrophobic wood does not change the color–texture of wood,but has a low–adhesion superhydrophobic performance,with a contact angle of 158°and roll–off angle of 6°.The robust superhydrophobic performance of biomimetic morphology self–assembles SiO₂–PDMS superhydrophobic wood under sand abrasion tests,but the contact angles lower than the as–prepared biomimetic morphology self–assemble SiO₂–PDMS superhydrophobic wood.The resulting surface not only exhibited superhydrophobic property but also had excellent robust performance under sand abrasion tests.8.Inspired by the biomineralization of nacre in seawater,a synthesize superhydrophilic CaCO₃ coating was successfully deposited on wood surface through the hydrothermal approach.The effects of hydrothermal time of the hydrothermal deposited CaCO₃ were comprehensively studied to determination of hydrothermal growth conditions of CaCO₃ nanocrystals.Biomimetic superhydrophilic CaCO₃coating with micro–nanostructures were obtained on the wood surface by a hydrothermal mineralization method for 2h and 12h in the range from 1～24h,respectively.The as–prepared biomimetic morphologies CaCO₃–biomineralization wood were modified by fluoroalkylsilane（FAS–17）to provides wood for robust superhydrophobic properties.The as–prepared FAS–17 modified biomimetic morphology CaCO₃–biomineralization wood has a superhydrophobic property;the static water contact angle is about 158°.Additionally,the as–prepared biomimetic morphology CaCO₃–biomineralization wood shows an excellent durability under different temperatures.