Construction of Renewable Superhydrophobic Surfaces via Thermally Induced Phase Separation and Mechanical Peeling |
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| Authors: | Qi Zhu Yuan Yu Qing-Yun Wu Lin Gu |
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| Affiliation: | 1.Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China2.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Tech-nology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China |
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| Abstract: | We report a simple preparation method of a renewable superhydrophobic surface by ther-mally induced phase separation (TIPS) and mechanical peeling. Porous polyvinylidene fluo-ride (PVDF) membranes with hierarchical structures were prepared by a TIPS process under different cooling conditions, which were confirmed by scanning electron microscopy and mer-cury intrusion porosimetry. After peeling off the top layer, rough structures with hundreds of nanometers to several microns were obtained. A digital microscopy determines that the surface roughness of peeled PVDF membranes is much higher than that of the original PVDF membrane, which is important to obtain the superhydrophobicity. Water contact angle and sliding angle measurements demonstrate that the peeled membrane surfaces display super-hydrophobicity with a high contact angle (152°) and a low sliding angle (7.2°). Moreover, the superhydrophobicity can be easily recovered for many times by a simple mechanical peel-ing, identical to the original superhydrophobicity. This simple preparation method is low cost, and suitable for large-scale industrialization, which may offer more opportunities for practical applications. |
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| Keywords: | Superhydrophobicity Polyvinylidene fluoride Peeling Regeneration Ther-mally induced phase separation |
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