A thermal regulator using passive all-magnetic actuation

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dc.citation.articleNumber101556en_US
dc.citation.issueNumber9en_US
dc.citation.journalTitleCell Reports Physical Scienceen_US
dc.citation.volumeNumber4en_US
dc.contributor.authorCastelli, Lorenzoen_US
dc.contributor.authorGarg, Ajayen_US
dc.contributor.authorZhu, Qingen_US
dc.contributor.authorSashital, Poojaen_US
dc.contributor.authorShimokusu, Trevor J.en_US
dc.contributor.authorWehmeyer, Geoffen_US
dc.date.accessioned2024-05-08T18:56:09Zen_US
dc.date.available2024-05-08T18:56:09Zen_US
dc.date.issued2023en_US
dc.description.abstractThermal regulators are two-terminal devices used for passive temperature control of electronics, batteries, or buildings. Existing thermal expansion regulators suffer from large thicknesses and substantial hysteresis. Here we report an all-magnetic thermal regulator in which the temperature of the control terminal (Tcontrol) leads to passive steady-state surface mating/demating that enables/blocks heat conduction. The mechanism relies on Tcontrol-dependent magnetic forces between gadolinium and neodymium iron boron magnets when Tcontrol is near gadolinium’s Curie temperature of 21oC. Our centimeter-scale prototype has a thermal switch ratio of 34−13+30 in vacuum and 2.1−0.2+0.2 in air, a vacuum OFF state thermal conductance of 3.5 mW/K, an average switching temperature of 20oC, a small thermal deadband of 5oC, and a relatively compact thickness <2 cm. We quantify the regulator performance over >2,000 cycles and construct the regulator using commercially available materials, showing that this thermomagnetic device can be used for effective thermal regulation near room temperature.en_US
dc.identifier.citationCastelli, L., Garg, A., Zhu, Q., Sashital, P., Shimokusu, T. J., & Wehmeyer, G. (2023). A thermal regulator using passive all-magnetic actuation. Cell Reports Physical Science, 4(9), 101556. https://doi.org/10.1016/j.xcrp.2023.101556en_US
dc.identifier.digital1-s20-S2666386423003533-mainen_US
dc.identifier.doihttps://doi.org/10.1016/j.xcrp.2023.101556en_US
dc.identifier.urihttps://hdl.handle.net/1911/115660en_US
dc.language.isoengen_US
dc.publisherElsevieren_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.titleA thermal regulator using passive all-magnetic actuationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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