Concentration fluctuations in a polymer solution under a temperature gradient

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dc.contributor.authorLi, W. B.
dc.contributor.authorZhang, K. J.
dc.contributor.authorSengers, Jan V.
dc.contributor.authorGammon, R. W.
dc.contributor.authorOrtiz De Zárate Leira, José María
dc.date.accessioned2023-06-20T19:10:10Z
dc.date.available2023-06-20T19:10:10Z
dc.date.issued1998-12-21
dc.description© 1998 The American Physical Society. We thank S. C. Greer for helpful advice concerning the characterization of the polymer sample and W. Köhler for valuable information for the Soret coefficient. This research is supported by the National Science Foundation, Grant No. CHE-9805260. J. M. O. Z. was funded by the Spanish Department of Education during his postdoctoral stage at Maryland, where the work was done.
dc.description.abstractWe have performed small-angle Rayleigh light-scattering measurements in polymer solutions under various externally applied temperature gradients. Our experiments confirm the existence of an enhancement of the concentration fluctuations. The nonequilibrium concentration fluctuations are proportional to (del T)(2)/k(4), where del T is the applied temperature gradient, and k is the wave number of the fluctuations. The measured strengths of the nonequilibrium fluctuations in the dilute and semidilute concentration regime agree with the strengths calculated from fluctuating hydrodynamics.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipNational Science Foundation
dc.description.sponsorshipSpanish Department of Education
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/27418
dc.identifier.doi10.1103/PhysRevLett.81.5580
dc.identifier.issn0031-9007
dc.identifier.officialurlhttp://dx.doi.org/10.1103/PhysRevLett.81.5580
dc.identifier.urihttps://hdl.handle.net/20.500.14352/59342
dc.issue.number25
dc.journal.titlePhysical review letters
dc.language.isoeng
dc.page.final5583
dc.page.initial5580
dc.publisherAmerican Physical Society
dc.relation.projectIDCHE-9805260
dc.rights.accessRightsopen access
dc.subject.cdu536
dc.subject.keywordNonequilibrium fluctuations
dc.subject.keywordLiquid-mixtures
dc.subject.keywordRayleigh-scattering
dc.subject.keywordLight-scattering
dc.subject.keywordShear-flow
dc.subject.keywordEquilibrium
dc.subject.keywordDiffusion
dc.subject.keywordGravity
dc.subject.keywordFluids
dc.subject.keywordRange
dc.subject.ucmTermodinámica
dc.subject.unesco2213 Termodinámica
dc.titleConcentration fluctuations in a polymer solution under a temperature gradient
dc.typejournal article
dc.volume.number81
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