Active particles sense micromechanical properties of glasses

Lozano, Celia; Gomez Solano, Juan Ruben; Bechinger, Clemens

Active particles sense micromechanical properties of glasses

Dateien

Lozano_2-huzp6z008gic6.pdfGröße: 685.83 KBDownloads: 479

Datum

2019

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Nature Materials. 2019, 18(10), pp. 1118-1123. ISSN 1476-1122. eISSN 1476-4660. Available under: doi: 10.1038/s41563-019-0446-9

Zusammenfassung

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.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

LOZANO, 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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