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Photoresponsive hydrogel microcrawlers exploit friction hysteresis to crawl by reciprocal actuation
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SYSNO ASEP 0540726 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Photoresponsive hydrogel microcrawlers exploit friction hysteresis to crawl by reciprocal actuation Author(s) Řehoř, Ivan (UOCHB-X) RID, ORCID
Maslen, C. (CZ)
Moerman, P. G. (NL)
van Ravensteijn, B. G. P. (NL)
van Alst, R. (NL)
Groenewold, J. (NL)
Eral, H. B. (NL)
Kegel, W. K. (NL)Source Title Soft Robotics. - : Mary Ann Liebert - ISSN 2169-5172
Roč. 8, č. 1 (2021), s. 10-18Number of pages 9 s. Language eng - English Country US - United States Keywords crawler ; friction hysteresis ; hydrogel ; photothermal ; PNIPAM OECD category Chemical process engineering Method of publishing Limited access Institutional support UOCHB-X - RVO:61388963 UT WOS 000528449000001 EID SCOPUS 85101217529 DOI 10.1089/soro.2019.0169 Annotation Mimicking the locomotive abilities of living organisms on the microscale, where the downsizing of rigid parts and circuitry presents inherent problems, is a complex feat. In nature, many soft-bodied organisms (inchworm, leech) have evolved simple, yet efficient locomotion strategies in which reciprocal actuation cycles synchronize with spatiotemporal modulation of friction between their bodies and environment. We developed microscopic (∼100 μm) hydrogel crawlers that move in aqueous environment through spatiotemporal modulation of the friction between their bodies and the substrate. Thermo-responsive poly-n-isopropyl acrylamide hydrogels loaded with gold nanoparticles shrink locally and reversibly when heated photothermally with laser light. The out-of-equilibrium collapse and reswelling of the hydrogel is responsible for asymmetric changes in the friction between the actuating section of the crawler and the substrate. This friction hysteresis, together with off-centered irradiation, results in directional motion of the crawler. We developed a model that predicts the order of magnitude of the crawler motion (within 50%) and agrees with the observed experimental trends. Crawler trajectories can be controlled enabling applications of the crawler as micromanipulator that can push small cargo along a surface. Workplace Institute of Organic Chemistry and Biochemistry Contact asep@uochb.cas.cz ; Kateřina Šperková, Tel.: 232 002 584 ; Jana Procházková, Tel.: 220 183 418 Year of Publishing 2022 Electronic address https://doi.org/10.1089/soro.2019.0169
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