Concentration Fluctuations in a Polymer Solution under a Temperature Gradient | Zendy

W. B. Li | Zendy; K. J. Zhang | Zendy; J. V. Sengers | Zendy; Robert W. Gammon | Zendy; José M. Ortiz de Zárate | Zendy

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Concentration Fluctuations in a Polymer Solution under a Temperature Gradient

Author(s) -

W. B. Li,

K. J. Zhang,

J. V. Sengers,

Robert W. Gammon,

José M. Ortiz de Zárate

Publication year - 1998

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.81.5580

Subject(s) - non equilibrium thermodynamics , nabla symbol , temperature gradient , physics , polymer , rayleigh scattering , thermodynamics , scattering , concentration gradient , condensed matter physics , materials science , optics , chemistry , nuclear magnetic resonance , quantum mechanics , chromatography , omega

We 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

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