Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session D23: Biological Fluid Dynamics: Locomotion - Active Suspensions
2:30 PM–4:14 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B311
Chair: Sebastian Fürthauer, Simons Foundation
Abstract ID: BAPS.2018.DFD.D23.6
Abstract: D23.00006 : Run-and-Tumble-like dynamics of Quincke rollers actuated by an AC electric field*
3:35 PM–3:48 PM
Presenter:
Hamid Karani
(Northwestern Univ)
Authors:
Hamid Karani
(Northwestern Univ)
Gerardo Pradillo
(Northwestern Univ)
Petia M Vlahovska
(Northwestern Univ)
Run-and-tumble dynamics is a canonical example of swimming strategy in self-propelled microswimmers such as E. Coli. It is characterized by swimming on straight line at almost constant velocity (runs), followed by a sudden complete random reorientation of swimming direction (tumbles). Here, we experimentally show how the Quincke rollers, previously studied mainly as an active Brownian particles, can perform Run-and-Tumble-like locomotion. We achieve this by modulating the intensity and duration of the applied electric field. Through single-particle-tracking analysis, we characterize the short-term and long-term dynamics of the mean-squared-displacement of the Quincke random walkers. More specifically, it is shown how the directed motion at short times and enhanced Brownian diffusion at longer time-scales are linked to the frequency and intensity of the applied electric field. We further demonstrate how we can engineer AC Quincke rollers to create a novel artificial particle system with well-controlled tunable properties to investigate anomalous diffusion in Run-and-Tumble dynamics.
*This work was supported in part by NSF grants DMS-1716114, CBET- 1704996, and CMMI-1740011
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D23.6
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