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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Dynamic scaling of the critical mixture perfluoromethylcyclohexane-carbon tetrachloride
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Dynamic scaling of the critical mixture perfluoromethylcyclohexane-carbon tetrachloride

机译：关键混合物全氟甲基环己烷-四氯化碳的动态结垢

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摘要

Ultrasonic attenuation, specific heats at constant pressure, static and dynamic light scattering as well as shear viscosity data of the perfluoromethylcyclohexane - carbon tetrachloride critical system have been re-evaluated in the light of the Bhattacherjee - Ferrell dynamic scaling model. The experimental sonic attenuation coefficients yield the theoretical form of the scaling function if a noncritical relaxation term is assumed to contribute to the total spectra in addition to the critical contribution. Evidence from noncritical ultrasonic spectra suggests the noncritical relaxation to be due to rotational isomerization of the perfluoromethylcyclohexane molecule. The amplitudes in the power laws of the fluctuation correlation length, the mutual diffusion coefficient and the relaxation rate of concentration fluctuations are xi(0) = (0.228 +/- 0.021) nm, D-0 = (1.24 +/- 0.04) x 10(9) m(2) s(-1), and Gamma(0) = (47.5 +/- 13) x 10(9) s(-1), respectively. The amplitude of the critical term in the heat capacity is C-pc = (0.093 +/- 0.002) J g(-1) K-1 and the adiabatic coupling constant results as g = 0.126.
机译：已根据Bhattacherjee-Ferrell动态缩放模型重新评估了超声波衰减，恒压下的比热，静态和动态光散射以及全氟甲基环己烷-四氯化碳临界系统的剪切粘度数据。如果假定非临界弛豫项除了对临界贡献之外对总谱有贡献，那么实验性的声衰减系数会得出缩放函数的理论形式。非临界超声光谱的证据表明，非临界弛豫是由于全氟甲基环己烷分子的旋转异构化。波动相关长度，互扩散系数和浓度波动缓和率的幂律中的振幅为xi（0）=（0.228 +/- 0.021）nm，D-0 =（1.24 +/- 0.04）x 10（9）m（2）s（-1）和Gamma（0）=（47.5 +/- 13）x 10（9）s（-1）。热容量中关键项的幅度为C-pc =（0.093 +/- 0.002）J g（-1）K-1，并且绝热耦合常数的结果为g = 0.126。

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