Photoresponsive hydrogel microcrawlers exploit friction hysteresis to crawl by reciprocal actuation
| Autor: | Renée A. van Alst, Charlie Maslen, Jan Groenewold, Ivan Rehor, Huseyin Burak Eral, Bas G. P. van Ravensteijn, Pepijn G. Moerman, Willem K. Kegel |
|---|---|
| Přispěvatelé: | Self-Organizing Soft Matter |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Friction Biophysics Metal Nanoparticles 02 engineering and technology law.invention friction hysteresis photothermal 020901 industrial engineering & automation PNIPAM Artificial Intelligence law crawler Micromanipulator Microscale chemistry Hydrogels 021001 nanoscience & nanotechnology Hysteresis Control and Systems Engineering Modulation Self-healing hydrogels Gold hydrogel 0210 nano-technology Web crawler Biological system Locomotion Order of magnitude Reciprocal |
| Zdroj: | Soft Robotics, 8(1), 10-18. Mary Ann Liebert Inc. |
| ISSN: | 2169-5180 2169-5172 |
| DOI: | 10.1089/soro.2019.0169 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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