Sound attenuation in critically slowed-down chemically reactive mixtures

The attenuation and dispersion of sound are examined theoretically as a potential probe of the recently reported theoretical predictions of slowing down of chemical reactions near thermodynamic critical points. A mode-coupling calculation of the complex sound attenuation coefficient in a chemically reactive binary mixture near the liquid–gas critical point reveals a divergent contribution, with critical exponents that are determined by the chemical rather than the diffusional pathway for composition relaxation. Possible experiments are discussed.

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