Propagating density spikes in light-powered motility-ratchets

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2019
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Liebchen, Benno
ten Hagen, Borge
Löwen, Hartmut
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urn:nbn:de:bsz:352-2-14w09xnjnqnqq8
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10.1039/c9sm00727j
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Soft Matter ; 15 (2019), 26. - pp. 5185-5192. - ISSN 1744-683X. - eISSN 1744-6848
Abstract
Combining experiments and computer simulations, we use a spatially periodic and flashing light-field to direct the motion of phototactic active colloids. Here, the colloids self-organize into a density spike pattern, which resembles a shock wave and propagates over long distances, almost without dispersing. The underlying mechanism involves a synchronization of the colloids with the light-field, so that particles see the same intensity gradient each time the light-pattern is switched on, but no gradient in between (for example). This creates pulsating transport whose strength and direction can be controlled via the flashing protocol and the self-propulsion speed of the colloids. Our results might be useful for drug delivery applications and can be used to segregate active colloids by their speed.
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ISO 690LOZANO, Celia, Benno LIEBCHEN, Borge TEN HAGEN, Clemens BECHINGER, Hartmut LĂ–WEN, 2019. Propagating density spikes in light-powered motility-ratchets. In: Soft Matter. 15(26), pp. 5185-5192. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/c9sm00727j
BibTex
@article{Lozano2019-07-03Propa-46018,
  year={2019},
  doi={10.1039/c9sm00727j},
  title={Propagating density spikes in light-powered motility-ratchets},
  number={26},
  volume={15},
  issn={1744-683X},
  journal={Soft Matter},
  pages={5185--5192},
  author={Lozano, Celia and Liebchen, Benno and ten Hagen, Borge and Bechinger, Clemens and Löwen, Hartmut}
}
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