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    Doubly Reentrant Cavities Prevent Catastrophic Wetting Transitions on Intrinsically Wetting Surfaces

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    acsami2E7b03526.pdf
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    Type
    Article
    Authors
    Domingues, Eddy
    Arunachalam, Sankara
    Mishra, Himanshu cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    BAS/1/1070-01-01
    BAS/1/1070-01-03
    BAS/1/1070-01-02
    Date
    2017-06-05
    Permanent link to this record
    http://hdl.handle.net/10754/624900
    
    Metadata
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    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.
    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.
    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).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Materials & Interfaces
    ISSN
    1944-8244
    1944-8252
    DOI
    10.1021/acsami.7b03526
    PubMed ID
    28580784
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/acsami.7b03526
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsami.7b03526
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)

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