Study On Bionic Preparation Of Micro-nanostructures And Properties Of Plant Leaves Onto Bamboo Surfaces Through Morph-genetic Method

As a wood fiber material,bamboo has similar texture with wood.It has good physical properties and mechanical properties,such as short growth cycle,and renewable,which is known as an important non timber forest resource.Under the condition of relatively scarce with wood resources,bamboo is widely used in many traditional fields as substitute wood.But because of the internal structure of bamboo and its own chemical composition,bamboo has a strong hydrophilic and hygroscopicity,and its water absorption process is mainly through its cross section.In the process of processing,using or storing,bamboo is relatively high in humidity for a long time,the size of bamboo and the size of each direction will increase after the absorption of water in bamboo,but the strength of bamboo will decrease correspondingly.At the same time,the water absorption and absorption of different parts of bamboo will be different,and then the local cracking,deformation and other defects will be caused,which may affect its dimensional stability,mechanical properties,service life and application value.In order to effectively solve such defects caused by water absorption and moisture absorption of bamboo,this thesis has studied the hydrophobic modification of bamboo surface.The chemical composition and microstructure of solid surface are important factors affecting the wettability.It is inspired by the special surface and properties of the leaves of natural materials,such as the superhydrophobic and self cleaning characteristics,the superhydrophobic and high adhesion properties of the rose petal multilayer micronano mastoid structure,the super hydrophobicity of the three stage composite structure of rice leaf,and so on.However,because the special micro structure of plant leaf surface is too fine,the commonly used technology is difficult to accurately imitate its surface morphology.So it can not make full use of the peculiar hydrophobic properties of the remains of the material.With the continuous development of science and technology,the nano biomimetic technology is gradually mature,which provides a new way of thinking and method for the hydrophobic modification of bamboo surface,that is,the Soft lithography.Soft lithography is a commonly used method for the preparation of micro and nano structure surface.This method has the advantages of simple operation,low cost,high efficiency and high precision.It is very suitable for fine nano surface microstructures of transfer plant leaves.The core of this method is to use the elastomer die or seal,usually using silicon based material such as PDMS,which is used to copy and copy the natural precision micro nano structure of the plant blade surface to the specific substrate surface.The cured substrate has the special micro nano structure of plant leaves and its singular functional properties.Based on the idea of "Lrean from Nature",this dissertation implants the concept of natural remains method into bamboo material,making full use of the diversity of the structural morphology of plant leaves and its functional diversity.In this study,using the method of soft printing technology,using the lotus leaf and rose petals of superhydrophobic plant leaves and rose petals as the template,the micro surface morphology of the lotus leaf and rose petals was transferred to the bamboo surface,and the special micro nano structure and characteristics of the lotus leaves and rose petals were prepared by the PDMS as the seal.At the same time,inorganic particles nano silica(Si O2)and titanium dioxide(Ti O2)were loaded on the surface of the plant leaf micro and nano structure bamboo,and the functional improvement was made.Furthermore,it can prolong the life of bamboo and increase the added value of bamboo and bamboo products so that it can serve people better and make good use of bamboo resources.SEM,EDS,AFM,TG-DTG,FTIR,XRD and contact angle measuring instrument were used to detect the surface of the microstructural bamboo leaves of the plant leaves.The results showed that the surface of the plant leaf microstructural bamboo surface,which was synthesized by the soft printing technology,had the surface micro mastoid structure similar to the original plant leaf.And rough surface.The results of TG show that the thermal stability of the surface of the leaves of plant leaves modified by nano Si O2 and Ti O2 has a greater degree of improvement.The final carbon residue rate of bamboo on the surface of the lotus leaf surface is increased from 6.1% to 31.3%,while the bamboo material on the surface of the rose petal surface increases from 3.72% to 54.95% after Ti O2.The water contact angle of bamboo surface is similar to that of plant leaf micro and nano structure.WCA shows greater than 150°,showing super hydrophobic character.Among them,the surface of the lotus leaf bamboo is slightly inclined to a certain angle,and the water drops on its surface,showing its clean characteristics,and the surface of the rose petal bamboo is reversed by 90°or even 180°,and the water drops still firmly on its surface,showing a high adhesion property.In addition,the surface of rose like petals has certain tolerance to acid and alkali.The bionic modification of bamboo surface can prolong the life of bamboo and increase the added value of bamboo and bamboo products,making a positive attempt for the goal of efficient utilization of bamboo resources.