期刊
JOURNAL OF MEMBRANE SCIENCE
卷 564, 期 -, 页码 465-472出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.07.035
关键词
Surface roughness enhancement; Solvent-thermal treatment; Superhydrophobic membrane; Polyvinylidene fluoride; Membrane distillation
资金
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-2017-CPF-3320]
- NSFC/RGC Joint Research Scheme - Research Grants Council of Hong Kong
- National Natural Science Foundation of China [N_HKU706/16]
Surface roughness enhancement by fabricating multi-scale nano/microstructure is an effective strategy to prepare superhydrophobic membranes. Here we report a novel solvent-thermal induced roughening (STIR) method. The method involves the swelling of a polymer surface to create a soft shell/hard core structure under the combined action of solvent and heating, followed by a controllable surface roughening as a result of mismatched thermal expansion between the shell and the core. We show a significant increase of surface roughness for a STIR-treated polyvinylidene fluoride nanofibrous membrane, whose nanofibers were covered with densely-packed nanofins. The treated membrane had greatly enhanced hydrophobicity, resulting in improved anti-wetting performance to low-surface-tension feed water in a membrane distillation process. The STIR method was capable of treating membranes with various pore structures. The novel surface roughening strategy opens up new directions to fabricate superhydrophobic surfaces and membranes, which can greatly benefit a wide range of applications such as membrane distillation, oil/water separation.
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