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The coexistence curves of {xC6H5NO2+(1−x)CH3(CH2)12CH3} in the critical region

✍ Scribed by Xueqin An; Haihong Zhao; Fuguo Jiang; Chunfeng Mao; Weiguo Shen

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
183 KB
Volume
29
Category
Article
ISSN
0021-9614

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✦ Synopsis

Coexistence curves for {xC6H5NO2 + (1 -x)CH3(CH2)12CH3} have been determined by measurements of refractive index. The critical amplitude B and the critical exponent b have been deduced from (T, n), (T, x), and (T, f) curves, where n, x, and f are refractive index, mole fraction, and volume fraction, respectively. The values of b are consistent with the theoretical ones. The experimental results have also been analysed to examine Wegner correction terms and the behaviour of the diameter of the coexistence curve in various units over a temperature range of 10 K from the critical temperature. The coexistence curves have been successfully described by a combination of the Wegner equation and the expression for the diameter. The molar mass (M)-dependence of critical volume fraction fc may be expressed as (1 -fc)/fc A M -r and -r is found to be 0.40.

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