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. 2018 Aug 24;9:3438. doi: 10.1038/s41467-018-06011-9

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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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Fig. 3 — Thermo-mechanical feedback mechanism for the autonomous oscillation. a Schematic illustration of the heat exchange followed by center of gravity shifting of TMES during the oscillation process. b Time-dependent infrared images. c Centroid and rate of change of centroid of TMES in the x-axis during a complete oscillation cycle at 60 °C. Insets of c are fluorescent images of marked TMES corresponding to the oscillation positions. All scale bars correspond to 1 cm