Active particles sense micromechanical properties of glasses

Nature Materials
Celia LozanoClemens Bechinger

Abstract

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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Citations

Apr 15, 2020·Soft Matter·Bryan VanSaders, Sharon C Glotzer
May 28, 2020·Nature Communications·Hanumantha Rao VutukuriJan Vermant
Sep 3, 2020·The Journal of Chemical Physics·S A MalloryA Cacciuto
Jan 23, 2021·Scientific Reports·Shuvojit PaulClemens Bechinger
Jan 9, 2021·Physical Review Letters·Clara Abaurrea-VelascoJoost de Graaf
Mar 12, 2021·The European Physical Journal. E, Soft Matter·N NarinderClemens Bechinger
Mar 12, 2021·The European Physical Journal. E, Soft Matter·Julian ReichertThomas Voigtmann
Feb 6, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Tao HuangLarysa Baraban
Nov 10, 2021·Soft Matter·Julian Reichert, Thomas Voigtmann
Nov 18, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Benno Liebchen, Aritra K Mukhopadhyay

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