Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2000-02-24
Physics
Condensed Matter
Soft Condensed Matter
revtex, 16 pages, 7 figures. J. Chem. Phys., to appear
Scientific paper
10.1063/1.481524
We have performed light-scattering measurements in dilute and semidilute polymer solutions of polystyrene in toluene when subjected to stationary temperature gradients. Five solutions with concentrations below and one solution with a concentration above the overlap concentration were investigated. The experiments confirm the presence of long-range nonequilibrium concentration fluctuations which are proportional to $(\nabla T)^2/k^4$, where $\nabla T$ is the applied temperature gradient and $k$ is the wave number of the fluctuations. In addition, we demonstrate that the strength of the nonequilibrium concentration fluctuations, observed in the dilute and semidilute solution regime, agrees with theoretical values calculated from fluctuating hydrodynamics. Further theoretical and experimental work will be needed to understand nonequilibrium fluctuations in polymer solutions at higher concentrations.
de Zárate José M. Ortiz
Gammon Robert W.
Li Wei-Bao
Sengers Jan V.
Zhang Kevin J.
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