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Structural signatures of dynamic heterogeneities in monolayers of colloidal ellipsoids

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  • Zhongyu Zheng

    (Institute of Mechanics, Chinese Academy of Sciences
    The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China)

  • Ran Ni

    (Debye Institute for Nano Materials Science, Utrecht University
    Laboratory of Physical Chemistry and Colloid Science, Wageningen University
    Van’t Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Science Park 904)

  • Feng Wang

    (The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China)

  • Marjolein Dijkstra

    (Debye Institute for Nano Materials Science, Utrecht University)

  • Yuren Wang

    (Institute of Mechanics, Chinese Academy of Sciences)

  • Yilong Han

    (The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China)

Abstract

When a liquid is supercooled towards the glass transition, its dynamics drastically slows down, whereas its static structure remains relatively unchanged. Finding a structural signature of the dynamic slowing down is a major challenge, yet it is often too subtle to be uncovered. Here we discover the structural signatures for both translational and rotational dynamics in monolayers of colloidal ellipsoids by video microscopy experiments and computer simulations. The correlation lengths of the dynamic slowest-moving clusters, the static glassy clusters, the static local structural entropy and the dynamic heterogeneity follow the same power-law divergence, suggesting that the kinetic slowing down is caused by a decrease in the structural entropy and an increase in the size of the glassy cluster. Ellipsoids with different aspect ratios exhibit single- or double-step glass transitions with distinct dynamic heterogeneities. These findings demonstrate that the particle shape anisotropy has important effects on the structure and dynamics of the glass.

Suggested Citation

  • Zhongyu Zheng & Ran Ni & Feng Wang & Marjolein Dijkstra & Yuren Wang & Yilong Han, 2014. "Structural signatures of dynamic heterogeneities in monolayers of colloidal ellipsoids," Nature Communications, Nature, vol. 5(1), pages 1-12, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4829
    DOI: 10.1038/ncomms4829
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    Cited by:

    1. David Doan & John Kulikowski & X. Wendy Gu, 2024. "Direct observation of phase transitions in truncated tetrahedral microparticles under quasi-2D confinement," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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