Effective temperature concept evaluated in an active colloid mixture

Han, Ming; Yan, Jing; Granick, Steve; Luijten, Erik

doi:10.1073/pnas.1706702114

Title: Effective temperature concept evaluated in an active colloid mixture

Journal Article · Mon Jul 03 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1706702114· OSTI ID:1367776

Han, Ming ^[1]; Yan, Jing ^[2]; Granick, Steve ^[3];

^[4]

Applied Physics Graduate Program, Northwestern University, Evanston, IL 60208,
Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801,
Institute for Basic Science Center for Soft and Living Matter, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea,
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208,, Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, IL 60208,, Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208

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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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States); Northwestern Univ., Evanston, IL (United States); Ulsan National Inst. of Science and Technology (UNIST) (Korea, Republic of)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Inst. for Basic Science (Korea, Republic of)

Grant/Contract Number:: FG02-07ER46471; DMR-1121262; DMR-1610796; CBET-0853737; IBS-R020-D1

OSTI ID:: 1367776

Alternate ID(s):: OSTI ID: 1465973

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 114 Journal Issue: 29; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 62 works

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36 MATERIALS SCIENCE
active matter
colloid
temperature
thermodynamics
nonequilibrium

Title: Effective temperature concept evaluated in an active colloid mixture

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