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. 2017 Dec 1;5(2):1700461. doi: 10.1002/advs.201700461

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© 2017 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Frequency response of microrobots with different tail length ratio (r ≃ 1.25, r ≃ 1.5, and r ≃ 1.75). The reversal frequency varies with the tail length ratio of each microrobot. a) Microrobots with tail length ratio 1.25 ± 0.05 (n = 6) have reversal frequency of 2.8 ± 0.9 Hz (n = 6). b) Microrobots with tail length ratio 1.5 ± 0.08 (n = 6) have reversal frequency of 5.4 ± 0.7 Hz (n = 6). c) Microrobots with tail length ratio 1.75 ± 0.03 (n = 6) have reversal frequency of 10.4 ± 0.5 Hz (n = 6) (Movie S2, Supporting Information).