Scaling behaviour of concentration fluctuations in a ternary liquid mixture: a dynamic light-scattering study
✍ Scribed by A. Wakker; J.F. van Baar; W.J. van Lith
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 440 KB
- Volume
- 174
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Dynamic light-scattering experiments with the ternary liquid mixture 4dimethylaminopyridine (DMAP), sulfolane, and water have shown that in the temperature range above the two-phase liquid-liquid region of this mixture, long-range concentration fluctuations exist, which obey a critical scaling law with respect to spinodal temperatures within the phase boundary curve. The scaling behaviour may even continue up to 60 K above the coexistence curve, depending on the actual location of the spinodal point. Outside the concentration range covering the two-phase region, a temperature-independent con-elation length of 0.83 nm is observed, which is a measure of the hydrodynamic radius of a single DMAP molecule.