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Thermal Diffusion

Thermal diffusion in colloidal dispersions
A temperature gradient applied to a liquid mixture not only causes a heat flux but also gives rise to a diffusion current of the constituent components. The resulting separation of the components causes a concentration gradient parallel or antiparallel with respect to the temperature gradient. This cross-effect between temperature and concentration is known as thermal diffusion or Ludwig-Soret-effect. Since its discovery by Ludwig (1856) and the first systematic investigations in liquid mixtures by Soret (1879), the effect has been subject to experimental and theoretical studies. Furthermore, the effect is relevant in technical applications as polymer characterization, the analysis of petrol reservoir characterization and for accumulation of uranium.

Soft Condensed Matter:
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