Hauptseminar Active Matter SS 2017/Phoretically-driven Microswimmers

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Datum
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Zeit
14:00
Thema
Phoretically-driven Microswimmers
Vortragender
tba
Betreuer
J. Ruben Gomez-Solano

Contents

Synthetic microswimmers have recently stimulated considerable research interest from experimental and theoretical viewpoints. Self-phoretic effects have shown to be an effective and promising strategy to design such artificial microswimmers, where the microswimmers are driven by gradient fields locally produced by swimmers themselves in the surrounding solvent. Self-phoretic swimmers are typically composed of two parts: a functional part which modifies the surrounding solvent properties creating local gradient fields, and a non-functional part which is exposed then to the local field gradients [1-2]. Most existing experimental investigations of the self-phoretic microswimmers consider Janus particles, which can be quite easily synthesized using partial metal coating on colloidal spheres. In diffusio-phoretic microswimmers, the metal coated part catalyzes a chemical reaction to induce a concentration gradient [3-5]. In thermophoretic microswimmers, the metal coated part is able to effectively absorb heat from e.g. an external laser, which creates a local temperature gradient [6].

Literature

  1. J. Anderson, Annu. Rev. Fluid Mech. 21, 61 (1989)
  2. J.F. Brady, J. Fluid Mech. 667, 216 (2011)
  3. J. R. Howse, R. A. L. Jones, A. J. Ryan, T. Gough, R. Vafabakhsh, and R. Golestanian, Phys. Rev. Lett. 99, 048102 (2007).
  4. J. Palacci, C. Cottin-Bizonne, C. Ybert, and L. Bocquet, Phys. Rev. Lett. 105, 088304 (2010).
  5. I. Buttinoni, G. Volpe, F. Kümmel, G. Volpe, and C. Bechinger, J. Phys. Condens. Matter 24, 284129 (2012).
  6. H.-R. Jiang, N. Yoshinaga, and M. Sano, Phys. Rev. Lett.105, 268302 (2010).