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Article: Topography-directed hot-water super-repellent surfaces

TitleTopography-directed hot-water super-repellent surfaces
Authors
KeywordsDigital microfluidics
Drop formation
Heat transfer
Magnetic bubbles
Microcavities
Issue Date2019
PublisherWiley Open Access. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2198-3844
Citation
Advanced Science, 2019, p. article no. 1900798, Epub How to Cite?
AbstractNatural and artificial super-repellent surfaces are frequently textured with pillar-based discrete structures rather than hole-based continuous ones because the former exhibits lower adhesion from the reduced length of the three-phase contact line. Counterintuitively, here, the unusual topographic effects are discovered on hot-water super-repellency where the continuous microcavity surface outperforms the discrete microneedle/micropillar surface. This anomaly arises from the different dependencies of liquid-repellency sta-bility on the surface structure and water temperature in the two topographies. The unexpected wetting dynamics are interpreted by determining timescales for droplet evaporation, vapor condensation, and droplet bouncing. The asso-ciated heat transfer process is unique to the wetting states and remarkably distinct from each other in the two topographies. It is envisioned that hot-water super-repellent microcavity surfaces will be advantageous for a variety of applications, especially when both self-cleaning and thermal insulation are imperative, such as clothing for scald protection and digital microfluidics for exothermic reactions.
Persistent Identifierhttp://hdl.handle.net/10722/273387
ISSN
2017 Impact Factor: 12.441

 

DC FieldValueLanguage
dc.contributor.authorZhu, P-
dc.contributor.authorCHEN, R-
dc.contributor.authorWang, L-
dc.date.accessioned2019-08-06T09:27:58Z-
dc.date.available2019-08-06T09:27:58Z-
dc.date.issued2019-
dc.identifier.citationAdvanced Science, 2019, p. article no. 1900798, Epub-
dc.identifier.issn2198-3844-
dc.identifier.urihttp://hdl.handle.net/10722/273387-
dc.description.abstractNatural and artificial super-repellent surfaces are frequently textured with pillar-based discrete structures rather than hole-based continuous ones because the former exhibits lower adhesion from the reduced length of the three-phase contact line. Counterintuitively, here, the unusual topographic effects are discovered on hot-water super-repellency where the continuous microcavity surface outperforms the discrete microneedle/micropillar surface. This anomaly arises from the different dependencies of liquid-repellency sta-bility on the surface structure and water temperature in the two topographies. The unexpected wetting dynamics are interpreted by determining timescales for droplet evaporation, vapor condensation, and droplet bouncing. The asso-ciated heat transfer process is unique to the wetting states and remarkably distinct from each other in the two topographies. It is envisioned that hot-water super-repellent microcavity surfaces will be advantageous for a variety of applications, especially when both self-cleaning and thermal insulation are imperative, such as clothing for scald protection and digital microfluidics for exothermic reactions.-
dc.languageeng-
dc.publisherWiley Open Access. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2198-3844-
dc.relation.ispartofAdvanced Science-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectDigital microfluidics-
dc.subjectDrop formation-
dc.subjectHeat transfer-
dc.subjectMagnetic bubbles-
dc.subjectMicrocavities-
dc.titleTopography-directed hot-water super-repellent surfaces-
dc.typeArticle-
dc.identifier.emailZhu, P: pazhu@hku.hk-
dc.identifier.emailWang, L: lqwang@hku.hk-
dc.identifier.authorityWang, L=rp00184-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1002/advs.201900798-
dc.identifier.scopuseid_2-s2.0-85070279440-
dc.identifier.hkuros300431-
dc.identifier.volume6-
dc.identifier.spagearticle no. 1900798-
dc.identifier.epagearticle no. 1900798-
dc.publisher.placeGermany-

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