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dc.contributor.authorDomingues, Eddy
dc.contributor.authorArunachalam, Sankara
dc.contributor.authorMishra, Himanshu
dc.date.accessioned2017-06-12T08:33:41Z
dc.date.available2017-06-12T08:33:41Z
dc.date.issued2017-06-19
dc.identifier.citationDomingues E, Arunachalam S, Mishra H (2017) Doubly Reentrant Cavities Prevent Catastrophic Wetting Transitions on Intrinsically Wetting Surfaces. ACS Applied Materials & Interfaces. Available: http://dx.doi.org/10.1021/acsami.7b03526.
dc.identifier.issn1944-8244
dc.identifier.issn1944-8252
dc.identifier.pmid28580784
dc.identifier.doi10.1021/acsami.7b03526
dc.identifier.urihttp://hdl.handle.net/10754/624900
dc.description.abstractOmniphobic surfaces, i.e. which repel all known liquids, have proven of value in applications ranging from membrane distillation to underwater drag reduction. A limitation of currently employed omniphobic surfaces is that they rely on perfluorinated coatings, increasing cost and environmental impact, and preventing applications in harsh environments. There is, thus, a keen interest in rendering conventional materials, such as plastics, omniphobic by micro/nano-texturing rather than via chemical make-up, with notable success having been achieved for silica surfaces with doubly reentrant micropillars. However, we found a critical limitation of microtextures comprising of pillars that they undergo catastrophic wetting transitions (apparent contact angles, θr → 0° from θr > 90°) in the presence of localized physical damages/defects or on immersion in wetting liquids. In response, a doubly reentrant cavity microtexture is introduced, which can prevent catastrophic wetting transitions in the presence of localized structural damage/defects or on immersion in wetting liquids. Remarkably, our silica surfaces with doubly reentrant cavities could exhibited apparent contact angles, θr ≈ 135° for mineral oil, where the intrinsic contact angle, θo ≈ 20°. Further, when immersed in mineral oil or water, doubly reentrant microtextures in silica (θo ≈ 40° for water) were not penetrated even after several days of investigation. Thus, microtextures comprising of doubly reentrant cavities might enable applications of conventional materials without chemical modifications, especially in scenarios that are prone to localized damages or immersion in wetting liquids, e.g. hydrodynamic drag reduction and membrane distillation.
dc.description.sponsorshipThe authors thank KAUST Baseline Research Funding (BAS/1/1070-01-01), Center Affiliated Fund (BAS/1/1070-01-03) and Start-up funds (BAS/1/1070-01-02).
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acsami.7b03526
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsami.7b03526.
dc.subjectDoubly reentrant cavities
dc.subjectomniphobicity
dc.subjectdamage-tolerance
dc.subjectunderwater hydrophobicity
dc.subjectwetting transitions
dc.subjectimmersion in mineral oil
dc.subjectvapor pressure
dc.subjectcapillary bridges
dc.titleDoubly Reentrant Cavities Prevent Catastrophic Wetting Transitions on Intrinsically Wetting Surfaces
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalACS Applied Materials & Interfaces
dc.eprint.versionPost-print
kaust.personDomingues, Eddy
kaust.personArunachalam, Sankara
kaust.personMishra, Himanshu
kaust.grant.numberBAS/1/1070-01-01
kaust.grant.numberBAS/1/1070-01-03
kaust.grant.numberBAS/1/1070-01-02
refterms.dateFOA2018-06-05T00:00:00Z
dc.date.published-online2017-06-19
dc.date.published-print2017-06-28


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