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Nonequilibrium noise in electrophoresis: The microion wind

Saha, Suropriya and Ramaswamy, Sriram (2014) Nonequilibrium noise in electrophoresis: The microion wind. In: PHYSICAL REVIEW E, 89 (3).

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Official URL: http://dx.doi.org/10.1103/PhysRevE.89.032307


A colloid supported against gravitational settling by means of an imposed electric field behaves, on average, as if it is at equilibrium in a confining potential T. M. Squires, J. Fluid Mech. 443, 403 (2001)]. We show, however, that the effective Langevin equation for the colloid contains a nonequilibrium noise source, proportional to the field, arising from the thermal motion of dissolved ions. The position fluctuations of the colloid show strong, experimentally testable signatures of nonequilibrium behavior, including a highly anisotropic, frequency-dependent ``effective temperature'' obtained from the fluctuation-dissipation ratio.

Item Type: Journal Article
Additional Information: copyright for this article belongs to AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 27 May 2014 11:36
Last Modified: 27 May 2014 11:36
URI: http://eprints.iisc.ac.in/id/eprint/49039

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