Active particles sense micromechanical properties of glasses

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Nature Materials. 2019, 18(10), pp. 1118-1123. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/s41563-019-0446-9
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Understanding the mechanical properties of glasses is a great scientific challenge. A powerful technique to study the material response on a microscopic scale is microrheology, in which one analyses the translational dynamics of an externally driven probe particle. Here we show that the translational and rotational dynamics of a self-propelled probe particle with an unconstrained orientational motion can be used to gather information about the mechanical properties of a colloidal glassy system. We find that its rotational diffusion coefficient continuously increases towards the glass transition and drops down in the glassy state. Such unexpected behaviour demonstrates a strong coupling mechanism between the orientation of the active probe particle and the glassy structure, which can be well described by a simple rheological model. Our results suggest that active probe particles may be useful for the micromechanical characterization of complex materials.

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ISO 690LOZANO, Celia, Juan Ruben GOMEZ SOLANO, Clemens BECHINGER, 2019. Active particles sense micromechanical properties of glasses. In: Nature Materials. 2019, 18(10), pp. 1118-1123. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/s41563-019-0446-9
BibTex
@article{Lozano2019-10Activ-46850,
  year={2019},
  doi={10.1038/s41563-019-0446-9},
  title={Active particles sense micromechanical properties of glasses},
  number={10},
  volume={18},
  issn={1476-1122},
  journal={Nature Materials},
  pages={1118--1123},
  author={Lozano, Celia and Gomez Solano, Juan Ruben and Bechinger, Clemens}
}
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