| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 97 === Superhydrophobicity (or the lotus effect), a well-known phenomenon and widely studied research topic, results from a surface having the micro/nanostructures composed of either proper and/or being modified functional groups. Owing to its larger contact angle (>150o) and smaller sliding angle (<10o) (or self-cleaning), superhydrophobicity has been found in many applications such as rain coat, window and so on.
There are numerous methods to construct superhydrophobic surface. In this study, we proposed the gas-liquid phase sol-gel process and utilized the liquid-liquid phase sol-gel process to construct superhydrophobic surface on polydimethyl siloxane (PDMS) and/or glass substrates. For the gas-liquid phase sol-gel process, the reactant was spin-coated on the PDMS substrate, followed by the diffusion of the vapours of the reactant and catalyst into the PDMS substrate. For the liquid-liquid phase sol-gel process, the generated hydrophobic SiO2 particles were deposited on the PDMS and glass substrates through dip coating. The results show that the SiO2 particles are formed and inlaid in the PDMS surface via the gas-liquid phase sol-gel process. Two layers of SiO2 particles are prepared and the wrinkle-like structures are obtained on the 2nd layer of SiO2 particles after silane modification. The contact angle of the surface as constructed is approximately 160o. As to the liquid-liquid phase sol-gel process, there is no need for further modification of the surface and the water droplet will not stay on the surface. By lowering the dip coating speed and concentration of the particles in the solution, a translucent superhydrophobic surface can be obtained.
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