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Construction of renewable superhydrophobic surfaces via thermally induced phase separation and mechanical peeling
wuqingyun
Author NameAffiliationE-mail
wuqingyun Ningbo Uinversity wuqingyun@nbu.edu.cn 
Abstract:
The present work reports a simple preparation of a renewable superhydrophobic surface by thermally induced phase separation (TIPS) and mechanical peeling. Porous polyvinylidene fluoride (PVDF) membranes with hierarchical structures were prepared by TIPS process under different cooling conditions. After peeling off the top layer, rough structures with hundreds of nanometers to several microns were obtained. Wide angle X-ray diffraction and Fourier transform infrared spectroscopy were used to characterize the surface structure of the peeled membranes. The results indicate the α phase with low surface energy is predominantly crystalline in peeled PVDF membrane surfaces. Water contact angle (CA) and sliding angle (SA) measurements demonstrate that the peeled membrane surfaces displayed superhydrophobicity with a high CA (152°) and a low SA (7.2°). Moreover, the superhydrophobicity can be easily recovered for many times by a simple mechanical peeling, 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.
Key words:  Superhydrophobic, polyvinylidene fluoride, peeling, regeneration, thermally induced phase separation
FundProject:
Construction of renewable superhydrophobic surfaces via thermally induced phase separation and mechanical peeling
wqy
摘要:
The present work reports a simple preparation of a renewable superhydrophobic surface by thermally induced phase separation (TIPS) and mechanical peeling. Porous polyvinylidene fluoride (PVDF) membranes with hierarchical structures were prepared by TIPS process under different cooling conditions. After peeling off the top layer, rough structures with hundreds of nanometers to several microns were obtained. Wide angle X-ray diffraction and Fourier transform infrared spectroscopy were used to characterize the surface structure of the peeled membranes. The results indicate the α phase with low surface energy is predominantly crystalline in peeled PVDF membrane surfaces. Water contact angle (CA) and sliding angle (SA) measurements demonstrate that the peeled membrane surfaces displayed superhydrophobicity with a high CA (152°) and a low SA (7.2°). Moreover, the superhydrophobicity can be easily recovered for many times by a simple mechanical peeling, 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.
关键词:  Superhydrophobic, polyvinylidene fluoride, peeling, regeneration, thermally induced phase separation
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