Doubly Reentrant Cavities Prevent Catastrophic Wetting Transitions on Intrinsically Wetting Surfaces

Handle URI:
http://hdl.handle.net/10754/624900
Title:
Doubly Reentrant Cavities Prevent Catastrophic Wetting Transitions on Intrinsically Wetting Surfaces
Authors:
Domingues, Eddy; Arunachalam, Sankara; Mishra, Himanshu ( 0000-0001-8759-7812 )
Abstract:
Omniphobic 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.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)
Citation:
Domingues 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.
Publisher:
American Chemical Society (ACS)
Journal:
ACS Applied Materials & Interfaces
KAUST Grant Number:
BAS/1/1070-01-01; BAS/1/1070-01-03; BAS/1/1070-01-02
Issue Date:
5-Jun-2017
DOI:
10.1021/acsami.7b03526
Type:
Article
ISSN:
1944-8244; 1944-8252
Sponsors:
The 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).
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/acsami.7b03526
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorDomingues, Eddyen
dc.contributor.authorArunachalam, Sankaraen
dc.contributor.authorMishra, Himanshuen
dc.date.accessioned2017-06-12T08:33:41Z-
dc.date.available2017-06-12T08:33:41Z-
dc.date.issued2017-06-05en
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.en
dc.identifier.issn1944-8244en
dc.identifier.issn1944-8252en
dc.identifier.doi10.1021/acsami.7b03526en
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.en
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).en
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acsami.7b03526en
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.en
dc.subjectDoubly reentrant cavitiesen
dc.subjectomniphobicityen
dc.subjectdamage-toleranceen
dc.subjectunderwater hydrophobicityen
dc.subjectwetting transitionsen
dc.subjectimmersion in mineral oilen
dc.subjectvapor pressureen
dc.subjectcapillary bridgesen
dc.titleDoubly Reentrant Cavities Prevent Catastrophic Wetting Transitions on Intrinsically Wetting Surfacesen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalACS Applied Materials & Interfacesen
dc.eprint.versionPost-printen
kaust.authorDomingues, Eddyen
kaust.authorArunachalam, Sankaraen
kaust.authorMishra, Himanshuen
kaust.grant.numberBAS/1/1070-01-01en
kaust.grant.numberBAS/1/1070-01-03en
kaust.grant.numberBAS/1/1070-01-02en
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