Design and fabrication of micro-textures for inducing a superhydrophobic behavior on hydrophilic materials |
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Authors: | Cao Liangliang Hu Hsin-Hua Gao Di |
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Affiliation: | Department of Chemical and Petroleum Engineering, Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA. |
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Abstract: | Artificial superhydrophobic surfaces are typically fabricated by tuning the surface roughness of intrinsically hydrophobic surfaces. We report here the design and fabrication of micro-textures for inducing a superhydrophobic behavior on hydrogen-terminated Si surfaces with an intrinsic water contact angle of approximately 74 degrees . The micro-textures consist of overhang structures with well-defined geometries fabricated by microfabrication technologies, which provide positions to support the liquid and prevent the liquid from entering into the indents between the micro-textures. As a result, water is in contact with a composite surface of solid and air, which induces the observed macroscopic superhydrophobic behavior. |
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