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Advanced Materials

Powerful, Multifunctional Torsional Micromuscles Activated by Phase Transition

Authors

  • Kai Liu,

    1. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Materials Sciences Division Lawrence Berkeley National Laboratory, Berkeley, California, USA
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  • Chun Cheng,

    1. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Materials Sciences Division Lawrence Berkeley National Laboratory, Berkeley, California, USA
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  • Joonki Suh,

    1. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Materials Sciences Division Lawrence Berkeley National Laboratory, Berkeley, California, USA
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  • Robert Tang-Kong,

    1. Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California, USA
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  • Deyi Fu,

    1. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Materials Sciences Division Lawrence Berkeley National Laboratory, Berkeley, California, USA
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  • Sangwook Lee,

    1. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Materials Sciences Division Lawrence Berkeley National Laboratory, Berkeley, California, USA
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  • Jian Zhou,

    1. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Materials Sciences Division Lawrence Berkeley National Laboratory, Berkeley, California, USA
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  • Leon O. Chua,

    1. Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California, USA
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  • Junqiao Wu

    Corresponding author
    1. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Materials Sciences Division Lawrence Berkeley National Laboratory, Berkeley, California, USA
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Abstract

Micro bimorph coils driven by a metalinsulator phase transition in VO2 function as powerful torsional muscles. Reversible torsional motion over one million cycles without degradation is demonstrated, with a superior rotational speed up to ca. 200 000 rpm, an amplitude of 500° per mm length, and a power density up to ca. 39 kW kg−1.

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