Investigation of the Soret Effect in Binary Liquid Mixtures by Thermal-Diffusion-Forced Rayleigh Scattering (CAT#: STEM-ST-0069-YJL)

Introduction

The separation of the components of a liquid mixture induced by temperature gradients is known as thermal diffusion or the Ludwig (1856)–Soret (1879) effect. Under typical experimental conditions avoiding convection, thermally driven diffusion flows are often orders of magnitude smaller than diffusion flows caused by concentration gradients. Nevertheless, in the steady state the thermally driven diffusion flow and the diffusion flow are equal. The experimental investigation of the Soret effect is very difficult and sensitive methods are required for a reliable determination of the Soret coefficient.

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Principle Applications Procedure Materials Notes Related Products

Principle

Forced Rayleigh scattering (FRS) is a light scattering technique used to investigate light-induced grating structures that decay in a relaxational or almost relaxational manner. Such gratings can be created by interference and absorption of two pump beams and probed by a third beam, usually of different frequency. They may consist of spatially varying excited state populations with picosecond lifetimes or of long-lived variations in temperature, composition, and/or density. Forced Rayleigh scattering provides high sensitivity with respect to the amplitude and dynamics of such gratings and allows investigations not accessible by classical scattering techniques.

Applications

Forced Rayleigh Scattering is used to study fluid.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Rayleigh scattering measurement system

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