Refractive index of concentrated colloidal dispersions
Refractive index of concentrated colloidal dispersions
复制标题
浓缩胶体分散体的折射率
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
M. Senior
中科院分区：
文献类型：
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作者：
K. Alexander;A. Killey;G. Meeten;M. Senior
本文描述了一系列无序水性胶体分散体的折射率n '的测量和理论解释。浓度高达50%的体积和粒径范围在0.1-1.5µm。所有的分散体都是高度浑浊的，需要特殊的折射测定方法。实验结果一致，实验误差一般随粒径的增大而增大。所有分散体的结果表明，n′与连续相和分散相的体积分数呈线性关系。对于大多数色散，n '也似乎是组成相的体积平均折射率，例外的是含有不均匀粘土颗粒的色散。我们的结果，无序色散，是完全一致的折射率测量由以前的工作人员使用有序，晶格形成色散。讨论了集中色散的两种理论，一种基于光散射，另一种基于射线光学。两者都准确地描述了我们的实验结果。
This paper describes the measurement and theoretical interpretation of the refractive index, n′, of a range of disordered aqueous colloidal dispersions. Concentrations up to 50% by volume and particle sizes in the range 0.1–1.5 µm were used. All dispersions were highly turbid and required special refractometric methods. These methods gave concordant results, experimental error generally increasing with increasing particle size. The results for all dispersions show that n′ is linearly related to the volume fractions of the continuous and dispersed phases. For most dispersions n′ also appears to be the volume average refractive index of constituent phases, the exception being a dispersion containing inhomogeneous clay particles. Our results, for disordered dispersions, are entirely concordant with refractive index measurements made by previous workers using ordered, lattice-forming dispersions. Two theories of n′ in concentrated dispersions are discussed, one based on light scattering and the other on ray optics. Both accurately describe our experimental results.