Crossover behavior of the susceptibility in the critical region of fluids and liquid mixtures
- and others
Long-range fluctuations affect thermodynamic properties of fluids in a large range of temperatures around the critical point. As a consequence the properties exhibit crossover from Ising-like behavior asymptotically close to the critical point to mean-field (van der Waals-like) behavior far away from the critical point. The authors have developed a theoretical expression for the crossover behavior of the susceptibility and used it to fit experimental data for various fluids, including aqueous and nonaqueous ionic solutions. They obtain an effective susceptibility critical exponent {gamma}{sub eff} as a function of the distance from the critical point. Although all the systems investigated exhibit an ultimate crossover to the universal Ising-like behavior asymptotically close to the critical point, the character of the crossover in ionic solutions differs from that in simpler fluids like xenon. The effective critical exponent for ionic fluids reaches its asymptotic value {gamma}{sub eff} = 1.24 from above, which corresponds to a negative sign of the amplitude of the first Wegner correction. The physical reason of this unusual crossover behavior is discussed.
- OSTI ID:
- 374978
- Report Number(s):
- CONF-9304297--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN 0003-0503; ISSN BAPSA6
- Country of Publication:
- United States
- Language:
- English
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