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Thermo-responsive jamming by particle shape change

Author

Listed:
  • Jiawei Han

    (Zhejiang University)

  • Peng Wang

    (Zhejiang University)

  • Yu Guo

    (Zhejiang University
    Huanjiang Laboratory)

  • Thomas Pähtz

    (Zhejiang University)

  • Zhaosheng Yu

    (Zhejiang University)

  • Chuan-Yu Wu

    (University of Surrey)

  • Jennifer S. Curtis

    (University of California Davis)

Abstract

Granular materials transition between unjammed (deformable) and jammed (rigid) states when adjusting their packing density. Here, we report on experiments demonstrating that the same kind of phase transition can be alternatively achieved through temperature-controlled particle shape change. Using a confined system of randomly-packed rod-like particles made of shape memory alloy (SMA), we exploit that shape recovery of these bent rods with rising temperature at a constant packing density leads to a jammed state. The responsible physical processes are elucidated with numerical simulations based on the Discrete Element Method. As an exemplary application of the uncovered mechanism, we engineer a smart clamp that can actively grip or release an object through the thermo-induced jamming or unjamming of the granular material, and robustly so under cyclic temperature changes. In the jammed state, its load-bearing capability surpasses the total SMA weight by a tunable margin, up to over 800-fold. The clamping design paves the way towards a new kind of functional devices based on the thermo-responsive jamming of shape memory granular materials.

Suggested Citation

  • Jiawei Han & Peng Wang & Yu Guo & Thomas Pähtz & Zhaosheng Yu & Chuan-Yu Wu & Jennifer S. Curtis, 2025. "Thermo-responsive jamming by particle shape change," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57475-5
    DOI: 10.1038/s41467-025-57475-5
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    References listed on IDEAS

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