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首页> 外文期刊>The Journal of Chemical Physics >SLOWING DOWN OF THE KINETICS OF LIQUID LIQUID PHASE SEPARATION ALONG THE BINODAL CURVE OF A BINARY LIQUID MIXTURE WITH A MISCIBILITY GAP APPROACHING THE CRITICAL POINT
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SLOWING DOWN OF THE KINETICS OF LIQUID LIQUID PHASE SEPARATION ALONG THE BINODAL CURVE OF A BINARY LIQUID MIXTURE WITH A MISCIBILITY GAP APPROACHING THE CRITICAL POINT

机译：具有临界点的具混溶性间隙的二元混合液二元曲线上液相分离动力学的减慢。

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摘要

A homogeneous mixture of iso-butoxyethanol/water of noncritical composition is brought from a state in the thermodynamic stable region of its phase diagram in the vicinity of its lower critical point to a metastable state close to the binodal curve by a fast pressure jump. It reaches its thermodynamic equilibrium state by separating into two coexisting liquid phases of different compositions. The emerging second liquid phase is formed by nucleation and growth of droplets. After a short transition time, the early stages of the diffusion limited growth of the droplets of the emerging second liquid phase are studied by light scattering (Mie scattering). The experiments are carried out as function of the temperature difference (T-p - T-c) along the two branches of the liquid/liquid coexistence curve (T-c, critical temperature; T-p, temperature of phase separation). The mutual diffusion coefficient D extracted from the kinetics of the droplet growth decreases approaching the critical point along the two branches of the binodal curve. The values of D obtained in this way are in good agreement with those characterizing the dynamics of concentration fluctuations in each of the coexisting phases in thermodynamic equilibrium monitored by dynamic light scattering experiments. (C) 1995 American Institute of Physics. [References: 24]
机译：非临界组成的异丁氧基乙醇/水的均匀混合物通过快速的压力跃变从其下临界点附近的相图的热力学稳定区域中的状态变为接近双稳态曲线的亚稳态。它通过分成两个成分不同的共存液相达到其热力学平衡状态。新兴的第二液相是通过液滴的成核和生长而形成的。在短暂的过渡时间之后，通过光散射（米氏散射）研究了扩散的早期阶段限制了新兴的第二液相液滴的生长。沿着液/液共存曲线的两个分支（T-c，临界温度; T-p，相分离的温度）沿着温度差（T-p-T-c）的函数进行实验。从液滴生长的动力学中提取的相互扩散系数D沿双曲线曲线的两个分支接近临界点时降低。以这种方式获得的D值与那些通过动态光散射实验监测的热力学平衡中每个共存相中浓度波动的动力学特征相吻合。 （C）1995年美国物理研究所。 [参考：24]

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