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Investigation of Micro and Nano Structure on Titanium Alloy Surface Influences Its Superhydrophobicity

Author: YuanChangSong
Tutor: ChenMingJun
School: Harbin Institute of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Superhydrophobic Microstructure Lotus effect Molecular Dynamics Contact angle
CLC: TG146.23
Type: Master's thesis
Year: 2010
Downloads: 250
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Abstract


In recent years, inspired by nature, lotus effect, with water contact angle greater than 150 ° superhydrophobic materials preparation and application has been widespread concern. In the self-cleaning materials, microfluidic devices, liquid transport, transport and biomedical and many other application areas, super-hydrophobic material demonstrated its unique advantages. Therefore, the super-hydrophobic material preparation method has been very rapid development, but is now very difficult to guarantee the production method of surface hydrophobic properties of consistency, precision and ultra-precision processing technology to ensure consistency in the structure of the material surface is the other processing method can not go beyond, so the application of mechanical processing methods obtain a superhydrophobic surface of a material nature will become future research. The surface of the hydrophobic solid material is an important feature of the main surface of a material chemical composition and microstructure geometry common decision. Chemical composition of the surface to be considered, the hydrophobic solid surface depends only on the material properties of the outermost atom or atomic group to the nature and arrangement of which is to change the material of the wetting performance of the method; hand, surface micro- geometry and roughness of the wetting properties of the material also has very important implications. In recent years, with the precision and ultra-precision processing technology, the rapid development of processing can be achieved nanometer scale, so the method can be machined surface structure of the material microstructure, thus changing the morphology and surface roughness of the material to achieve control surface hydrophobic properties, and then get a super hydrophobic nature of the material surface. Based on the theory of super-hydrophobic, lotus effect departure from nature, designed three can get super-hydrophobic nature of material microstructure, in the classical theory of super-hydrophobic deduced on the basis of a variety of micro-structured surface contact angle of the theoretical prediction formula . Based on the principle of molecular dynamics method, the use of molecular dynamics on titania surface hydrophobicity of the simulation. Established by the surface of the titanium dioxide micro-structure model has a micro structure and the smooth surface of the hydrophobic titanium dioxide case simulation comparison, according to the simulation result of the material surface microstructure of hydrophobicity. According to the established micro-structural model, select the appropriate machines and tools, determine a reasonable cutting parameters, the preparation of CNC machining process, thus completing the processing of the titanium alloy surface designed to obtain super-hydrophobic nature of the material microstructure. Preparation of microstructure on the surface of titanium super-hydrophobic properties and characterization laboratory testing, access to micro-structure and parameters of the material in the form of the hydrophobic properties of the law, the impact, and then analyzes the surface of the material microstructure parameters of the contact angle is studied.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Titanium
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