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Granick, Steve
CSLM(Center for Soft and Living Matter) Lab
Research Interests
  • Chemistry, physics, biology, engineering

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Effective temperature concept evaluated in an active colloid mixture

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Title
Effective temperature concept evaluated in an active colloid mixture
Author
Han, MingYan, JinGranick, SteveLuijten, Erik
Keywords
active matter; colloid; temperature; thermodynamics; nonequilibrium
Issue Date
201707
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.114, no.29, pp.7513 - 7518
Abstract
Thermal energy agitates all matter, and its competition with ordering tendencies is a fundamental organizing principle in the physical world; this observation suggests that an effective temperature might emerge when external energy input enhances agitation. However, despite the repeated proposal of this concept based on kinetics for various nonequilibrium systems, the value of an effective temperature as a thermodynamic control parameter has been unclear. Here, we introduce a two-component system of driven Janus colloids, such that collisions induced by external energy sources agitate the system, and we demonstrate quantitative agreement with hallmarks of statistical thermodynamics for binary phase behavior: the archetypal phase diagram with equilibrium critical exponents, Gaussian displacement distributions, and even capillarity. The significance is to demonstrate a class of dynamical conditions under which thermodynamic analysis extends quantitatively to systems that are decidedly nonequilibrium except that the effective temperature differs from the physical temperature.
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DOI
http://dx.doi.org/10.1073/pnas.1706702114
ISSN
0027-8424
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