锂皂石老化分散体的Refractive Index
On the Refractive Index of Ageing Dispersions of Laponite
摘要：
锂皂石在低离子浓度下的水分散体是令人感兴趣的，因为它经历相对于时间的结构演变，这通常被称为老化。在这项工作中，我们研究的折射率行为作为老化时间，浓度和温度的函数。我们观察到扩展的Lorenz-Lorentz方程很好地拟合了折射率对浓度和温度的依赖关系。折射率没有显示出任何老化时间的依赖性。然而，折射率对浓度的依赖性表现出显着的变化，因为该系统经历了从各向同性到两相状态的过渡。的折射率-密度数据的斜率是非常接近的水在所有Laponite浓度。在传输现象的背景下，光学测量，如干涉测量法可以利用Laponite分散体的类水行为。
英文摘要：
Aqueous dispersion of Laponite at low ionic concentration is of interest since it undergoes structural evolution with respect to time, which is usually termed as ageing. In this work we study the refractive index behavior as a function of ageing time, concentration and temperature. We observed that the extended Lorenz-Lorentz equation fitted the refractive index dependence on concentration and temperature very well. The refractive index did not show any dependence on ageing time. However, the dependence of refractive index on concentration showed a marked change as the system underwent transition from an isotropic to a biphasic state. The slope of the refractive index-density data is remarkably close to that of water at all Laponite concentrations. In the context of transport phenomena, optical measurements such as interferometry can exploit the water-like behavior of Laponite dispersions.
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