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. 2017 Jun 21;7:3930. doi: 10.1038/s41598-017-04337-w

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© The Author(s) 2017

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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(a) A schematic image of the camphor engine driven growth of the chemical gardens. The boat is placed in a Petri dish. Blue wires depict filaments grown under the chemical gardens reaction. (b) Construction of the self-propelling micro-boat containing FeCl₃ seed crystals. The PVC tube contains FeCl₃ seed crystals and camphor. The lengths of the tubes L in the experiments were 10 mm and 15 mm.