2018 Impact factor 1.686
Soft Matter and Biological Physics
Eur. Phys. J. E 2, 211-216

Critical behavior of the binary-fluid isobutyric acid-water with added ions (K+, Cl-)

A. Toumi - M. Bouanz

Laboratoire de Diffusion, Département de Physique, Faculté des Sciences de Tunis, Tunis 1060, Tunisia

Received 12 June 1998 and Received in final form 26 July 1999

Abstract
Measurements of the coexistence curve of the binary-fluid mixture isobutyric acid + water with added KCl salt at various concentrations show an important dependence on the critical temperature and the critical exponent $\beta$. The phase-transition region shifts as a function of the salt concentration. The effective -critical exponent $\beta ^* =
(0.266{--}0.293)$ is neither compatible with the Ising value $\beta =0.325$ nor with the Fisher renormalized value $\sim
0.365.$

PACS
05.70.Jk Critical point phenomena - 64.70.Ja Liquid-liquid transitions - 76.30.Da Ions and impurities: general

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