Preparation Of Nanostructured Zinc Oxide Thin Films And The Wetting Regulation

Wettability is a very important physical property of the solid surface and has an important influence on all aspects of production and life.The influencing factors of the surface wettability of materials can be divided into two aspects: the surface chemical composition and the surface microstructure.The research on the wettability control is mostly limited to changing the chemical composition of the material surface or controlling the roughness of the material surface.It is worthwhile to study the two aspects together.In addition,the wettability of the surface of the material is inseparable from the complexity of the external environment in addition to its own factors.The early wetting of the solid in the air and the wetting mechanism are relatively simple,and the research carried out is relatively large.Solids in complex environments are complicated by different phases,making the wetting regulation process much more difficult than in the air.Therefore,relatively few studies on infiltration regulation in complex environments have been conducted.How to achieve a high level of control of wettability in simple and complex environments is also a hot topic in the field of wettability.In the first part of this paper,we first used sol-gel method and hydrothermal method to prepare a nanocrystalline zinc oxide array film with a single crystal form and a regular appearance,utilizing the photoinduced hydrophilic property and hidden recovery process of nano-ZnO.Reversible regulation of wettability in simple and complex environments is achieved.The experimental results show that in the air environment,the prepared nano-ZnO film is placed in a dark environment for 7 days and its surface can reach a superhydrophobic wettability state of 150°.The surface hydroxyl groups and water content are increased after 210 min UV irradiation.At the same time,the surface exhibits a super-hydrophilic wetting state,and it can still maintain the recovery of superhydrophobicity after being hidden.Subsequent reversible regulation of wettability from superhydrophobic to superhydrophilic in the oil phase was also achieved using the same method.In the second part of this paper,the nano-zinc oxide composite film with micro/nano structures was prepared by the template method.The dynamic changes of the microstructure of the surface of the material and the influence of the change of the external conditions on the wettability were studied,and the combination of the two was realized.Reversible regulation of multiple wettability states.The E-51 epoxy resin and nano-ZnO were used to prepare a composite membrane with a micron array on the surface.The photo-induced hydrophilization,hiding and heating recovery processes of nano-ZnO were used to achieve the wettability from super-hydrophobic to super-hydrophobic.Hydrophilic reversible regulation.In the analysis of dynamic changes in microstructure,changes in the degree of deformation and wettability of the microstructures of the externally acting microstructures were investigated.The reversible control of the surface from super-hydrophobic to hydrophobic is achieved by the change of the surface microstructure.When the surface structure of the composite membrane collapses,the reversible change of wettability from hydrophobic to hydrophilic is achieved by applying ultraviolet light and hidden recovery,and eventually realizes many changes.A reversible transformation of the wetting state.