Dropwise Condensation on Multi-scale Bioinspired Metallic Surfaces with Nano-Features

dc.contributor.author Orejon, Daniel
dc.contributor.author Attinger, Daniel
dc.contributor.author Askounis, Alexandros
dc.contributor.author Takata, Yasuyuki
dc.contributor.author Attinger, Daniel
dc.contributor.department Mechanical Engineering
dc.date 2019-08-15T13:46:32.000
dc.date.accessioned 2020-06-30T06:05:10Z
dc.date.available 2020-06-30T06:05:10Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2019
dc.date.issued 2019-06-10
dc.description.abstract <p>Non-wetting surfaces engineered from intrinsically hydrophilic metallic materials are promising for self-cleaning, anti-icing and/or condensation heat transfer applications where the durability of the coating is an issue. In this work, we fabricate and study the wetting behaviour and the condensation performance on two metallic non-wetting surfaces with varying number and size of the roughness tiers without further hydrophobic coating procedure. On one hand, the surface resembling a rose petal exhibits a sticky non-wetting behaviour as drops wet the microscopic roughness features with the consequent enhanced drop adhesion, which leads to filmwise condensation. On the other hand, the surface resembling a lotus leaf provides super-repellent non-wetting behaviour prompting the continuous nucleation, growth and departure of spherical drops in a dropwise condensation fashion. On a lotus leaf surface, the third nano-scale roughness tier (created by chemical oxidation) combined with ambience exposure prompts the growth of drops in the Cassie state with the benefit of minimal condensate adhesion. The two different condensation behaviours reported are well supported by a drop surface energy analysis, which accounts for the different wetting performance and the surface structure underneath the condensing drops. Further, we coated the above-mentioned surfaces with polydimethylsiloxane surfaces, which resulted in filmwise condensation due to the smoothening of the different roughness tiers. Continuous dropwise condensation on a hierarchical bioinspired lotus leaf metallic surface without the need for a conformal hydrophobic coating is hence demonstrated, which offers a novel path for the design and manufacture of non-coated metallic super-repellent surfaces for condensation phase change applications, amongst others.</p>
dc.description.comments <p>This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in <em>ACS Applied Materials and Interfaces</em>, copyright © American Chemical Society after peer review. To access the final edited and published work see DOI: <a href="http://dx.doi.org/10.1021/acsami.9b06001" target="_blank">10.1021/acsami.9b06001</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/me_pubs/364/
dc.identifier.articleid 1366
dc.identifier.contextkey 14755316
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath me_pubs/364
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/55236
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/me_pubs/364/2019_AttingerDaniel_DropwiseCondensation.pdf|||Fri Jan 14 23:47:59 UTC 2022
dc.source.uri 10.1021/acsami.9b06001
dc.subject.disciplines Biology and Biomimetic Materials
dc.subject.disciplines Mechanical Engineering
dc.subject.disciplines Polymer and Organic Materials
dc.title Dropwise Condensation on Multi-scale Bioinspired Metallic Surfaces with Nano-Features
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 584f53d6-fea9-47aa-a192-697ef4c972b7
relation.isOrgUnitOfPublication 6d38ab0f-8cc2-4ad3-90b1-67a60c5a6f59
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