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Article: One-step tailoring surface roughness and surface chemistry to prepare superhydrophobic polyvinylidene fluoride (PVDF) membranes for enhanced membrane distillation performances

TitleOne-step tailoring surface roughness and surface chemistry to prepare superhydrophobic polyvinylidene fluoride (PVDF) membranes for enhanced membrane distillation performances
Authors
KeywordsSurface roughness
Surface chemistry
Membrane distillation
Superhydrophobic membrane
Polyvinylidene fluoride
Issue Date2019
PublisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/jcis
Citation
Journal of Colloid and Interface Science, 2019, v. 553, p. 99-107 How to Cite?
AbstractSuperhydrophobic polyvinylidene fluoride (PVDF) membrane is a promising material for membrane distillation. Existing approaches for preparing superhydrophobic PVDF membrane often involve separate manipulation of surface roughness and surface chemistry. Here we report a one-step approach to simultaneously manipulate both the surface roughness and surface chemistry of PVDF nanofibrous membranes for enhanced direct-contact membrane distillation (DCMD) performances. The manipulation was realized in a unique solvent-thermal treatment process, during which a treatment solution containing alcohols was involved. We demonstrate that by using different chain-length alcohols in the treatment solvent, surface roughness can be promoted by creating nanofin structures on the PVDF nanofibers using an alcohol which has moderate affinity with PVDF. Meanwhile, surface chemistry can be tuned by adjusting the fraction distribution of crystal phases (nonpolar α phase and polar β phase) in the membrane using different alcohols. PVDF membranes with different surface wettabilities were used to evaluate the effects of surface roughness and surface energy on the DCMD performances. Combining both low surface energy and multi-scale surface roughness, pentanol-treated PVDF membrane achieved best anti-water property (water contact angle of 164.1° and sliding angle of 8.1°), and exhibited superior water flux and enhanced anti-wetting ability to low-surface-tension feed in the DCMD application.
Persistent Identifierhttp://hdl.handle.net/10722/273378
ISSN
2017 Impact Factor: 5.091
2015 SCImago Journal Rankings: 1.126

 

DC FieldValueLanguage
dc.contributor.authorQing, W-
dc.contributor.authorWang, J-
dc.contributor.authorMa, X-
dc.contributor.authorYao, Z-
dc.contributor.authorFeng, Y-
dc.contributor.authorShi, X-
dc.contributor.authorLiu, F-
dc.contributor.authorWang, P-
dc.contributor.authorTang, C-
dc.date.accessioned2019-08-06T09:27:48Z-
dc.date.available2019-08-06T09:27:48Z-
dc.date.issued2019-
dc.identifier.citationJournal of Colloid and Interface Science, 2019, v. 553, p. 99-107-
dc.identifier.issn0021-9797-
dc.identifier.urihttp://hdl.handle.net/10722/273378-
dc.description.abstractSuperhydrophobic polyvinylidene fluoride (PVDF) membrane is a promising material for membrane distillation. Existing approaches for preparing superhydrophobic PVDF membrane often involve separate manipulation of surface roughness and surface chemistry. Here we report a one-step approach to simultaneously manipulate both the surface roughness and surface chemistry of PVDF nanofibrous membranes for enhanced direct-contact membrane distillation (DCMD) performances. The manipulation was realized in a unique solvent-thermal treatment process, during which a treatment solution containing alcohols was involved. We demonstrate that by using different chain-length alcohols in the treatment solvent, surface roughness can be promoted by creating nanofin structures on the PVDF nanofibers using an alcohol which has moderate affinity with PVDF. Meanwhile, surface chemistry can be tuned by adjusting the fraction distribution of crystal phases (nonpolar α phase and polar β phase) in the membrane using different alcohols. PVDF membranes with different surface wettabilities were used to evaluate the effects of surface roughness and surface energy on the DCMD performances. Combining both low surface energy and multi-scale surface roughness, pentanol-treated PVDF membrane achieved best anti-water property (water contact angle of 164.1° and sliding angle of 8.1°), and exhibited superior water flux and enhanced anti-wetting ability to low-surface-tension feed in the DCMD application.-
dc.languageeng-
dc.publisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/jcis-
dc.relation.ispartofJournal of Colloid and Interface Science-
dc.subjectSurface roughness-
dc.subjectSurface chemistry-
dc.subjectMembrane distillation-
dc.subjectSuperhydrophobic membrane-
dc.subjectPolyvinylidene fluoride-
dc.titleOne-step tailoring surface roughness and surface chemistry to prepare superhydrophobic polyvinylidene fluoride (PVDF) membranes for enhanced membrane distillation performances-
dc.typeArticle-
dc.identifier.emailFeng, Y: jerryf@HKUCC-COM.hku.hk-
dc.identifier.emailTang, C: tangc@hku.hk-
dc.identifier.authorityTang, C=rp01765-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jcis.2019.06.011-
dc.identifier.pmid31200232-
dc.identifier.scopuseid_2-s2.0-85067005700-
dc.identifier.hkuros299801-
dc.identifier.volume553-
dc.identifier.spage99-
dc.identifier.epage107-
dc.publisher.placeUnited States-

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