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  Clusters, asters, and collective oscillations in chemotactic colloids

Saha, S., Golestanian, R., & Ramaswamy, S. (2014). Clusters, asters, and collective oscillations in chemotactic colloids. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 89(6): 062316. doi:10.1103/PhysRevE.89.062316.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-76E9-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-76EA-3
Genre: Journal Article

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Saha, S., Author
Golestanian, Ramin1, Author              
Ramaswamy, S., Author
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1Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2570692              

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 Abstract: The creation of synthetic systems that emulate the defining properties of living matter, such as motility, gradient-sensing, signaling, and replication, is a grand challenge of biomimetics. Such imitations of life crucially contain active components that transform chemical energy into directed motion. These artificial realizations of motility point in the direction of a new paradigm in engineering, through the design of emergent behavior by manipulating properties at the scale of the individual components. Catalytic colloidal swimmers are a particularly promising example of such systems. Here we present a comprehensive theoretical description of gradient-sensing of an individual swimmer, leading controllably to chemotactic or anti-chemotactic behavior, and use it to construct a framework for studying their collective behavior. We find that both the positional and the orientational degrees of freedom of the active colloids can exhibit condensation, signaling formation of clusters and asters. The kinetics of catalysis introduces a natural control parameter for the range of the interaction mediated by the diffusing chemical species. For various regimes in parameter space in the long-ranged limit our system displays precise analogs to gravitational collapse, plasma oscillations, and electrostatic screening. We present prescriptions for how to tune the surface properties of the colloids during fabrication to achieve each type of behavior. © 2014 American Physical Society.

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Language(s): eng - English
 Dates: 2014-06-262014-06
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevE.89.062316
BibTex Citekey: Saha2014
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Title: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
Source Genre: Journal
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Pages: 7 Volume / Issue: 89 (6) Sequence Number: 062316 Start / End Page: - Identifier: -