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Liquid-liquid critical phenomena. The coexistence curve of n-heptane-acetic anhydride

Nagarajan, N and Kumar, Anil and Gopal, ESR and Greer, SC (1980) Liquid-liquid critical phenomena. The coexistence curve of n-heptane-acetic anhydride. In: Journal of Physical Chemistry, 84 (22). pp. 2883-2887.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/j100459a011


The coexistence curve of the binary liquid mixture n-heptane-acetic anhydride has been determined by the observation of the transition temperatures of 76 samples over the range of compositions. The functional form of the difference in order parameter, in terms of either the mole fraction or the volume fraction, is consistent with theoretical predictions invoking the concept of universality at critical points. The average value of the order parameter, the diameter of the coexistence curve, shows an anomaly which can be described by either an exponent 1 - a, as predicted by various theories (where a is the critical exponent of the specific heat), or by an exponent 20 (where P is the coexistence curve exponent), as expected when the order parameter used is not the one the diameter of which diverges asymptotically as 1 - a.

Item Type: Journal Article
Publication: Journal of Physical Chemistry
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Jan 2010 07:17
Last Modified: 19 Sep 2010 05:52
URI: http://eprints.iisc.ac.in/id/eprint/24862

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