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. 2020 Oct 14;11:5166. doi: 10.1038/s41467-020-18801-1

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Schematic for the fabrication of anisotropic hydrogel after incorporating AuNPs into the precursor solution. b Absorption spectra of the aqueous suspension of AuNPs, anisotropic hydrogels with and without AuNPs. c Variations of localized temperature of the gel under the irradiation of 520 nm green light with different power intensity. d, e Photos (d) and variations of the localized temperature and gel dimensions (e) to show the reversible anisotropic deformation of the AuNP-containing hydrogel under cyclic irradiation of green light with the intensity of 3.7 W cm⁻². Scale bar in d is 1 cm.