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The (liquid + liquid) critical phenomena of (a polar liquid + ann-alkane) V. Coexistence curves of (N,N-dimethylacetamide + heptane)

✍ Scribed by Xuequin An; Haihong Zhao; Fuguo Jiang; Weiguo Shen

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 213 KB
Volume: 28
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.1996.0109

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✦ Synopsis

The coexistence curves of liquid (N,N-dimethylacetamide + heptane) have been determined within 15 K of the critical temperature by measurements of the refractive index n. The critical amplitudes B and the critical exponents b have been deduced from (T, n), (T, x), and (T, f) curves. Experimental values of b are consistent with the theoretical prediction. The results have also been analysed to determine Wegner correction terms when b and D are fixed at the theoretical values, and to examine the behaviour of the diameters of the coexistence curves. Molar mass-dependences of B and the critical volume fraction fc have been derived from the classical theory without the limitation of fc 1, and tested against the experimental results.

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