甲醇与环己烷液-液系统的临界现象研究

A Study of Critical Phenomena in a Liquid-Liquid System Composed of Methanol and Cyclohexane

利用光子相关动态光散射技术,研究甲醇与环己烷二元液-液系统临界点附近相关长度变化,符合 Ising 模型得出的幂律发散规律.还发现该系统在临界点附近的粘滞系数变化符合经验公式,但其幂律发散指数则比相关长度的幂律发散指数小得多.

In relation to a liquid-liquid system composed of methanol and cyclohexane,the author studied the changing pattern of the correation length close to its critical point by means of dynamic light scattering which is correlated with photon.The change in correlation length was found to be in line with the regular pattern of power law divergence obtained by Ising model.In addition,a new viscosimeter with low shear rate was applied to study the change of viscosity coefficient in this system close to its critical point.The change was found to be in line with an empirical formula,however,the ecponent of its power law divergence is much smaller than that of correlation length.