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. 2018 Sep 10;8:13528. doi: 10.1038/s41598-018-31932-2

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© The Author(s) 2018

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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Photographs of a REO-particle-precipitated rod gel with (a) no irradiation, and (b) 808 and (c) 980 nm near-infrared light irradiation at 3 W cm⁻² for 60 s at 28 °C. The left and right sides of the 1-mm-diameter rod gel are the Nd₂O₃- and Yb₂O₃-particle-precipitated gel moieties, respectively. For ease of photographing, the position of the settled REO particle part in the rod gel in (c) was inverted with respect to that in (a) and (b). (d) Temperature range for the selective-bending response plotted against the rod diameter.