Distinguishing advective and powered motion in self-propelled colloids.

J Phys Condens Matter

Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, United States of America. Department of Physics, Pennsylvania State University, University Park, PA 16802, United States of America.

Published: November 2017

Self-powered motion in catalytic colloidal particles provides a compelling example of active matter, i.e. systems that engage in single-particle and collective behavior far from equilibrium. The long-time, long-distance behavior of such systems is of particular interest, since it connects their individual micro-scale behavior to macro-scale phenomena. In such analyses, it is important to distinguish motion due to subtle advective effects-which also has long time scales and length scales-from long-timescale phenomena that derive from intrinsically powered motion. Here, we develop a methodology to analyze the statistical properties of the translational and rotational motions of powered colloids to distinguish, for example, active chemotaxis from passive advection by bulk flow.

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http://dx.doi.org/10.1088/1361-648X/aa88f1DOI Listing

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