Active Brownian Motion with Orientation-Dependent Motility: Theory and Experiments
| Autor: | Laura Alvarez, Miguel Angel Fernandez-Rodriguez, Hartmut Löwen, Raphael Wittkowski, Lucio Isa, Alexander R. Sprenger |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Dynamics (mechanics) Rotational diffusion FOS: Physical sciences 02 engineering and technology Surfaces and Interfaces Particle displacement Condensed Matter - Soft Condensed Matter 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Displacement (vector) 0104 chemical sciences Classical mechanics Electrochemistry Particle Brownian noise Soft Condensed Matter (cond-mat.soft) General Materials Science 0210 nano-technology Anisotropy Spectroscopy Brownian motion |
| Zdroj: | Langmuir, 36 (25) |
| Popis: | Combining experiments on active colloids, whose propulsion velocity can be controlled via a feedback loop, and theory of active Brownian motion, we explore the dynamics of an overdamped active particle with a motility that depends explicitly on the particle orientation. In this case, the active particle moves faster when oriented along one direction and slower when oriented along another, leading to an anisotropic translational dynamics which is coupled to the particle's rotational diffusion. We propose a basic model of active Brownian motion for orientation-dependent motility. Based on this model, we obtain analytic results for the mean trajectories, averaged over the Brownian noise for various initial configurations, and for the mean-square displacements including their anisotropic non-Gaussian behavior. The theoretical results are found to be in good agreement with the experimental data. Our findings establish a methodology to engineer complex anisotropic motilities of active Brownian particles, with potential impact in the study of the swimming behavior of microorganisms subjected to anisotropic driving fields. Comment: 34 pages, 6 figures, 2 movies |
| Databáze: | OpenAIRE |
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