Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

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dc.citation.articleNumber2300817en_US
dc.citation.issueNumber13en_US
dc.citation.journalTitleAdvanced Materials Interfacesen_US
dc.citation.volumeNumber11en_US
dc.contributor.authorShimokusu, Trevor J.en_US
dc.contributor.authorNathani, Aliaen_US
dc.contributor.authorLiu, Zhenen_US
dc.contributor.authorYap, Te Fayeen_US
dc.contributor.authorPreston, Daniel J.en_US
dc.contributor.authorWehmeyer, Geoffen_US
dc.date.accessioned2024-11-04T16:25:10Zen_US
dc.date.available2024-11-04T16:25:10Zen_US
dc.date.issued2024en_US
dc.description.abstractJumping droplet thermal diodes (JDTDs) are promising candidates to achieve thermal rectification for next-generation thermal control. However, most prior demonstrations of JDTDs have relied on monolayer-coated copper-based superhydrophobic (SHPB) surfaces, while lower-cost aluminum JDTDs with more durable thin polymeric coatings have not been explored. In this work, a JDTD is constructed that employs SHPB aluminum surfaces coated with protective thin films of Teflon AF (amorphous fluoropolymer) 1601. Measurements for different heating orientations, gap heights (H), and fill ratios (ϕ) show that a maximum thermal rectification ratio of 7 can be achieved for H = 2.4 mm and ϕ = 10%. A thermal circuit is demonstrated that uses the JDTD to rectify time-periodic temperature profiles, achieving thermal circuit effectiveness values up to 30% of the ideal-diode limit. Coupon-level durability tests and device-level cycling show that dip coated Teflon AF enables stable operation of Al JDTDs over >20 cycles, improving on the performance of a monolayer-coated surface that fails after 5 cycles. The findings of this work signify that Teflon AF coated Al SHPB surfaces can be used for thermal rectification and motivate future research into Al JDTDs for advanced thermal management applications.en_US
dc.identifier.citationShimokusu, T. J., Nathani, A., Liu, Z., Yap, T. F., Preston, D. J., & Wehmeyer, G. (2024). Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification. Advanced Materials Interfaces, 11(13), 2300817. https://doi.org/10.1002/admi.202300817en_US
dc.identifier.digitalTeflon-AF-Coated-Nanotextured-Aluminum-Surfacesen_US
dc.identifier.doihttps://doi.org/10.1002/admi.202300817en_US
dc.identifier.urihttps://hdl.handle.net/1911/117983en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleTeflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectificationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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