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Herein, hydrogel actuators that allow high\u2010speed driving and large deformation with high\u2010frequency local controllability while maintaining softness are fabricated based on liquid metal gel fibers as electrodes by using microfluidic technology. The Lorentz force produced by an electric current and a magnet is used for actuation control. An ultrafast response of 260.5\u2009mm\u2009s<jats:sup>\u22121<\/jats:sup> with high\u2010frequency controllability (6\u2009Hz) and a large deformation of 172% with hydrogel actuation are observed. As proof of concept, moving stages, micromixers, and grippers exhibiting high speeds with high mechanical deformability while maintaining the inherent characteristics of hydrogel phases are demonstrated. Different hydrogels can be used with the proposed actuator architecture and fabrication scheme, enabling different functionalities.<\/jats:p><\/jats:sec>","DOI":"10.1002\/aisy.202100212","type":"journal-article","created":{"date-parts":[[2022,1,13]],"date-time":"2022-01-13T06:06:29Z","timestamp":1642053989000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Ultrafast and Highly Deformable Electromagnetic Hydrogel Actuators Assembled from Liquid Metal Gel Fiber"],"prefix":"10.1002","volume":"4","author":[{"given":"Daiki","family":"Tachibana","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koki","family":"Murakami","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Kozaki","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryosuke","family":"Matsuda","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yutaka","family":"Isoda","sequence":"additional","affiliation":[{"name":"Graduate School of System Integration Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fumika","family":"Nakamura","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuji","family":"Isano","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuhide","family":"Ueno","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Life Science Yokohama National University  79-5 Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ohmi","family":"Fuchiwaki","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"},{"name":"Graduate School of System Integration Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3702-6357","authenticated-orcid":false,"given":"Hiroki","family":"Ota","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"},{"name":"Graduate School of System Integration Yokohama National University  79-5, Tokiwadai Hodogaya-ku Yokohama Kanagawa 240-8501 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,1,13]]},"reference":[{"key":"e_1_2_9_2_1","first-page":"1","volume":"30","author":"Truby R. 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