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Very low-angle static light scattering from steady-state and time-dependent nonequilibrium fluctuations

  • A. Vailati
  • M. Giglio
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 104)

Abstract

We investigate both steady-state and time-dependent nonequilibrium fluctuations by means of very low-angle static light scattering. The system is a thin layer of a binary liquid mixture close to a critical consolution point and placed in a temperature gradient. Due to this choice, the Soret driven nonequilibrium fluctuations are large and their time evolution is slow enough to be followed at ease. We discuss the fast q divergence at steady state and its low q frustration induced by the presence of gravity. We also report measurements taken during the build-up of the concentration gradient. The data indicate that no additional contributions are present during the time-dependent part of the process beyond those calculated in the quasi-steady-state approximation.

Key words

Nonequilibrium fluctuations static light scattering 

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Copyright information

© Steinkopff Verlag 1997

Authors and Affiliations

  • A. Vailati
    • 1
  • M. Giglio
    • 1
  1. 1.Dipartimento di Fisica and Istituto Nazionale per la Fisica della MateriaUniversità di MilanoMilanoItaly

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