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Article: Topography-directed hot-water super-repellent surfaces
Title | Topography-directed hot-water super-repellent surfaces |
---|---|
Authors | |
Keywords | Digital microfluidics Drop formation Heat transfer Magnetic bubbles Microcavities |
Issue Date | 2019 |
Publisher | Wiley Open Access. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2198-3844 |
Citation | Advanced Science, 2019, v. 6 n. 18, article no. 1900798 How to Cite? |
Abstract | Natural 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 Identifier | http://hdl.handle.net/10722/273387 |
ISSN | 2023 Impact Factor: 14.3 2023 SCImago Journal Rankings: 3.914 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Zhu, P | - |
dc.contributor.author | CHEN, R | - |
dc.contributor.author | Wang, L | - |
dc.date.accessioned | 2019-08-06T09:27:58Z | - |
dc.date.available | 2019-08-06T09:27:58Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Advanced Science, 2019, v. 6 n. 18, article no. 1900798 | - |
dc.identifier.issn | 2198-3844 | - |
dc.identifier.uri | http://hdl.handle.net/10722/273387 | - |
dc.description.abstract | Natural 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.language | eng | - |
dc.publisher | Wiley Open Access. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2198-3844 | - |
dc.relation.ispartof | Advanced Science | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | Digital microfluidics | - |
dc.subject | Drop formation | - |
dc.subject | Heat transfer | - |
dc.subject | Magnetic bubbles | - |
dc.subject | Microcavities | - |
dc.title | Topography-directed hot-water super-repellent surfaces | - |
dc.type | Article | - |
dc.identifier.email | Zhu, P: pazhu@hku.hk | - |
dc.identifier.email | Wang, L: lqwang@hku.hk | - |
dc.identifier.authority | Wang, L=rp00184 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1002/advs.201900798 | - |
dc.identifier.scopus | eid_2-s2.0-85070279440 | - |
dc.identifier.hkuros | 300431 | - |
dc.identifier.volume | 6 | - |
dc.identifier.issue | 18 | - |
dc.identifier.spage | article no. 1900798 | - |
dc.identifier.epage | article no. 1900798 | - |
dc.identifier.isi | WOS:000477798700001 | - |
dc.publisher.place | Germany | - |
dc.identifier.issnl | 2198-3844 | - |