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Preparation、Structure and Properties of Organic Modified Nano-SiO2 Superhydrophobic Coatings

Author: HuXiaoJuan
Tutor: LuoYuanFang
School: South China University of Technology
Course: Materials Science
Keywords: Superhydrophobic film Sol - gel method . Nano-silica Silicone Contact angle
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 509
Quote: 1
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Abstract


In recent years, through the low surface energy material in the solid surface modification, or build surface superhydrophobic surface micro-structure fabrication and water contact angle greater than 150 ° attracted scholars from various countries because of its wide range of applications and the tantalizing prospect pole The big concern. Already prepared many artificial superhydrophobic surface. Mainly used methods are: the template method, laser or plasma etching, physical or chemical vapor deposition method, a sol-gel method, the electro-spinning method or the like. These methods, however, the lack of large-scale preparation of operability due to the limitations of the process, such as the preparation of technically preparation conditions harsh and costly reason difficult to get the universal application of the coating. Therefore explore the process is simple, low cost, and actually used in the preparation of large area superhydrophobic surface has important theoretical and practical significance. In this study, the use of sol - gel prepared monodisperse nano-silica (SiO 2 ) sol, silicone low surface energy, including hydrogen content of 0.08% and 0.386% silicone oil (PMHS), and hydroxy silicone (HTO), the hydroxy fluorosilicone oil (HTFO), the nano - SiO 2 particles the surface cross-linking and a hydrophobic treatment, and then pulling the film deposition on a glass substrate and heated gel prepared surface micro-nano double rough structure of super-hydrophobic nano SiO 2 coating. Means of contact angle measurement, infrared spectroscopy, X-ray surface spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy, atomic force microscope to study the preparation conditions, structure and properties of super-hydrophobic film. The results showed that the four organic silicon modified nano-silica coating can reach superhydrophobic level. 2 Preferably, the coating film hydrophobic effect on the coating film prepared in 170 ℃ heat treatment wherein PMHS (hydrogen content of 0.386%)-modified SiO after 3h, the contact angle up 173 °, the rolling angle is as low as 0.8 °, and the super-hydrophobic coating film exhibits excellent solvent resistance, chemical resistance and environmental aging properties. 2 sol and silicone - nano-SiO 2 superhydrophobic film morphology study found that organic silicon and SiO 2 > generated on the surface of the chemical combination, forming a the silicone-SiO 2 hybrid crosslinked material; the surface of the coating film is a low surface energy silicone coated, while a more uniform distribution of many particle diameter of 50-400nm micron Nano - double roughness asperity, which is the main reason to produce excellent ultra-hydrophobic properties. By the experimental results of the surface of the membrane structure and the influence of the roughness on the wetting properties, the binding the Cassie model theoretical analysis shows that the surface of the coating film composed of silicone oil modified cross-linked silica particles constitute a heterogeneous interface found Cassie model.

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