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Oscillating modes of driven colloids in overdamped systems

Author

Listed:
  • Johannes Berner

    (Universität Stuttgart
    Universität Konstanz)

  • Boris Müller

    (Universität Stuttgart
    Max-Planck-Institut für Intelligente Systeme)

  • Juan Ruben Gomez-Solano

    (Universität Stuttgart
    Universität Konstanz)

  • Matthias Krüger

    (Universität Stuttgart
    Max-Planck-Institut für Intelligente Systeme
    Universität Göttingen, Institut für Theoretische Physik)

  • Clemens Bechinger

    (Universität Stuttgart
    Universität Konstanz
    Max-Planck-Institut für Intelligente Systeme)

Abstract

Microscopic colloidal particles suspended in liquids are a prominent example of an overdamped system where viscous forces dominate over inertial effects. Frequently, colloids are used as sensitive probes, e.g., in biophysical applications from which molecular forces are inferred. The interpretation of such experiments rests on the assumption that, even when the particles are driven, the liquid remains in equilibrium. Here we experimentally demonstrate that this is not valid for particles in viscoelastic fluids. Even at small driving forces, we observe particle oscillations with several tens of seconds. They are attributed to non-equilibrium fluctuations of the fluid being excited by the particle’s motion. The oscillatory dynamics is in quantitative agreement with an overdamped Langevin equation with negative friction-memory term being equivalent to a stochastically driven underdamped oscillator. Such oscillatory modes are expected to widen the use of colloids as model systems but must also be considered in colloidal probe experiments.

Suggested Citation

  • Johannes Berner & Boris Müller & Juan Ruben Gomez-Solano & Matthias Krüger & Clemens Bechinger, 2018. "Oscillating modes of driven colloids in overdamped systems," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03345-2
    DOI: 10.1038/s41467-018-03345-2
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    Cited by:

    1. Bhattacharjee, Suraka & Satpathi, Urbashi & Sinha, Supurna, 2022. "Quantum Brownian motion of a charged oscillator in a magnetic field coupled to a heat bath through momentum variables," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 605(C).
    2. Xiaobin Dai & Xuanyu Zhang & Lijuan Gao & Ziyang Xu & Li-Tang Yan, 2022. "Topology mediates transport of nanoparticles in macromolecular networks," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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