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  Active colloidal propulsion over a crystalline surface

Choudhury, U., Straube, A., Fischer, P., Gibbs, J., & Höfling, F. (2017). Active colloidal propulsion over a crystalline surface. New Journal of Physics, 19: 125010, pp. 1-12. doi:10.1088/1367-2630/aa9b4b.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-2261-1 Version Permalink: https://hdl.handle.net/21.11116/0000-000E-4C08-5
Genre: Journal Article

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 Creators:
Choudhury, Udit, Author
Straube, Arthur, Author
Fischer, Peer1, Author                 
Gibbs, John, Author
Höfling, Felix, Author
Affiliations:
1Max Planck Institute for Medical Research, Max Planck Society, ou_1125545              

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 Abstract: We study both experimentally and theoretically the dynamics of chemically self-propelled Janus colloids moving atop a two-dimensional crystalline surface. The surface is a hexagonally close-packed monolayer of colloidal particles of the same size as the mobile one. The dynamics of the self-propelled colloid reflects the competition between hindered diffusion due to the periodic surface and enhanced diffusion due to active motion. Which contribution dominates depends on the propulsion strength, which can be systematically tuned by changing the concentration of a chemical fuel. The mean-square displacements (MSDs) obtained from the experiment exhibit enhanced diffusion at long lag times. Our experimental data are consistent with a Langevin model for the effectively two-dimensional translational motion of an active Brownian particle in a periodic potential, combining the confining effects of gravity and the crystalline surface with the free rotational diffusion of the colloid. Approximate analytical predictions are made for the MSD describing the crossover from free Brownian motion at short times to active diffusion at long times. The results are in semi-quantitative agreement with numerical results of a refined Langevin model that treats translational and rotational degrees of freedom on the same footing.

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Language(s): eng - English
 Dates: 2017-10-022017-07-182017-12-14
 Publication Status: Published online
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1367-2630/aa9b4b
BibTex Citekey: 2017choudhury
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Title: New Journal of Physics
  Abbreviation : New J. Phys.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 19 Sequence Number: 125010 Start / End Page: 1 - 12 Identifier: ISSN: 1367-2630
CoNE: https://pure.mpg.de/cone/journals/resource/954926913666