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Dielectric relaxation of acetonitrile-water mixtures

✍ Scribed by R. Jellema; J. Bulthuis; G. van der Zwan

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 929 KB
Volume: 73-74
Category: Article
ISSN: 0167-7322
DOI: 10.1016/s0167-7322(97)00066-4

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✦ Synopsis

The dielectric relaxation of acet,onitrile-water mixtures is measured at 298.15 I<. From the resulting complex permittivity spectra, two relaxation processes are found. The lowfrequency process is attributed to water molecules that reside in a micro-phase of relative11 stable clusters. The high-frequency process is attributed to both acet,onitrile and watrl molecules in a second micro-phase.

The divergence of the structure of the liquid, thus microhet,erogeneity, is at a maximum at mole fractions .r ,=0.6-0.7. This is close t,o the composition at which the acetonitrile-water mixture has an upper c,ritical demixing point. albeit at. much lower temperatures.

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