Coexistence curve of the ionic binary mixture ethylammomium nitrate-n-octanol: Critical properties

被引:27
作者
Bonetti, M
Oleinikova, A
Bervillier, C
机构
[1] CEA,SERV PHYS THEOR,F-91191 GIF SUR YVETTE,FRANCE
[2] T SHEVCHENKO UNIV,DEPT PHYS,UA-252127 KIEV,UKRAINE
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 12期
关键词
D O I
10.1021/jp962316s
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present measurements of the coexistence curve of the ionic mixture ethylammonium nitrate - n-octanol within the reduced temperature range 2.6 x 10(-5) < t < 4.2 x 10(-2). The salt volume fraction is chosen as the order parameter as this gives the most symmetric phase diagram. The determination of the asymptotic critical exponent beta gives a value close to the 3-D Ising value although correction-to-scaling terms are necessary to fit the data. The effective exponent beta(eff) as a function of the reduced temperature does not show any crossover from the classical to the Ising value and suggests rather an approach, from below, to the asymptotic 3-D Ising value. The (1 - alpha) anomaly of the mean diameter could not be precisely determined although a deviation near T-c from the rectilinear law could be noticed.
引用
收藏
页码:2164 / 2173
页数:10
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