Publikation: Dynamics of self-propelled Janus particles in viscoelastic fluids
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2016
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Physical Review Letters. 2016, 116(13), 138301. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.116.138301
Zusammenfassung
We experimentally investigate active motion of spherical Janus colloidal particles in a viscoelastic fluid. Self-propulsion is achieved by a local concentration gradient of a critical polymer mixture which is imposed by laser illumination. Even in the regime where the fluid's viscosity is independent from the deformation rate induced by the particle, we find a remarkable increase of up to two orders of magnitude of the rotational diffusion with increasing particle velocity, which can be phenomenologically described by an effective rotational diffusion coefficient dependent on the Weissenberg number. We show that this effect gives rise to a highly anisotropic response of microswimmers in viscoelastic media to external forces depending on its orientation.
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GOMEZ-SOLANO, Juan Ruben, Alex BLOKHUIS, Clemens BECHINGER, 2016. Dynamics of self-propelled Janus particles in viscoelastic fluids. In: Physical Review Letters. 2016, 116(13), 138301. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.116.138301BibTex
@article{GomezSolano2016-02-25T09:21:17ZDynam-39246,
year={2016},
doi={10.1103/PhysRevLett.116.138301},
title={Dynamics of self-propelled Janus particles in viscoelastic fluids},
number={13},
volume={116},
issn={0031-9007},
journal={Physical Review Letters},
author={Gomez-Solano, Juan Ruben and Blokhuis, Alex and Bechinger, Clemens},
note={Article Number: 138301}
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<dcterms:abstract xml:lang="eng">We experimentally investigate active motion of spherical Janus colloidal particles in a viscoelastic fluid. Self-propulsion is achieved by a local concentration gradient of a critical polymer mixture which is imposed by laser illumination. Even in the regime where the fluid's viscosity is independent from the deformation rate induced by the particle, we find a remarkable increase of up to two orders of magnitude of the rotational diffusion with increasing particle velocity, which can be phenomenologically described by an effective rotational diffusion coefficient dependent on the Weissenberg number. We show that this effect gives rise to a highly anisotropic response of microswimmers in viscoelastic media to external forces depending on its orientation.</dcterms:abstract>
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