Adhesion and friction properties of micro/nano-engineered superhydrophobic/hydrophobic surfaces |
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Authors: | Y. Song M. Zou Y.A. Wang |
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Affiliation: | a Department of Mechanical Engineering, University of Arkansas, Fayetteville, AR 72701, USA b Ocean NanoTech, LLC., 2143 Worth Lane, Springdale, AR 72764, USA |
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Abstract: | Hydrophobic micro/nano-engineered surfaces (MNESs) with good adhesion and frictional performances were fabricated by the combination of aluminum-induced crystallization (AIC) of amorphous silicon (a-Si) and octadecyltrichlorosilane (OTS) coating. The AIC of a-Si technique was used to produce silicon micro/nano-textured surfaces, while an OTS self-assembled monolayer was used to lower the surface energies of the textured surfaces. The wetting properties of the MNESs were studied using a video-based contact angle measurement system. The adhesion and friction properties of the MNESs were investigated using a TriboIndenter. This study shows that the adhesion and frictional performances of all MNESs are significantly improved compared to untreated silicon substrate surfaces, and the adhesion and frictional performances of the OTS-modified textured surfaces strongly correlate to their surface wetting property, i.e., the larger the water contact angle, the better the adhesion and frictional performances of the OTS-modified textured surfaces. |
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Keywords: | Aluminum-induced crystallization of amorphous silicon Adhesion Friction Hydrophobic Superhydrophobic Micro/nano-textured surfaces Octadecyltrichlorosilane Self-assembled monolayer |
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