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Evidence of critical concentration fluctuation contributions to the ultrasonic absorption spectrum of 2,6-dimethylpyridine/water

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
148
Identifiers
DOI: 10.1016/0009-2614(88)80307-5

Abstract

Abstract The sound absorption coefficient has been measured between 0.2 and 400 MHz as a function of frequency for pure 2,6-di-methylpyridine (2,6-DMP), for a dilute aqueous 2,6-DMP solution, and for a 2,6-DMP/water mixture of critical composition at various temperatures near the critical. The sound absorption spectra of pure 2,6-DMP and of the dilute solution do not show contributions in addition to the classical ones. The spectra of the critical mixture exhibit excess absorption over the whole frequency band. The measured data are consistent with the Bhattacharjee-Ferrell theory of critical concentration fluctuations.

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