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To understand the operating features of multifunctional materials, bioinspired multi-layer actuators represent a simple solution as a testing platform. Here, we report the fabrication of a bilayer photothermal and biodegradable bending actuator, based on thermal expansion of polycaprolactone-lignin blend, 3D printed on cellulose acetate substrate. When the actuator is irradiated with 300\u00a0mW\/cm<jats:sup>2<\/jats:sup> of simulated solar irradiance, it shows a change in curvature of 25.34%, with a bending moment of ~80.2\u00a0\u00b5N\u00a0\u00b7\u00a0m and with a characteristic actuation time of 30\u00a0s. Moreover, the photothermal blend shows a conversion efficiency of 13.5%. Due to the photothermal and biodegradability properties, the actuator could be used as a battery-free tool for different tasks, in a scenario where no contamination of the environment is required.<\/jats:p>","DOI":"10.1007\/978-3-031-38857-6_12","type":"book-chapter","created":{"date-parts":[[2023,7,31]],"date-time":"2023-07-31T07:02:35Z","timestamp":1690786955000},"page":"156-164","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Bioinspired Soft Actuator Based on Photothermal Expansion of Biodegradable Polymers"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5135-1623","authenticated-orcid":false,"given":"Luca","family":"Cecchini","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8483-7005","authenticated-orcid":false,"given":"Stefano","family":"Mariani","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2136-2396","authenticated-orcid":false,"given":"Nicola M.","family":"Pugno","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0722-8350","authenticated-orcid":false,"given":"Barbara","family":"Mazzolai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,8,1]]},"reference":[{"key":"12_CR1","doi-asserted-by":"crossref","unstructured":"Rus, D., Tolley, M.: Design, fabrication and control of soft robots. 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