Approach for particle sizing in dense polydisperse colloidal suspension using multiple scattered light
Approach for particle sizing in dense polydisperse colloidal suspension using multiple scattered light
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DOI：
10.1021/la010726o
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发表时间：
2001-10-02
期刊：
影响因子：
3.9
通讯作者：
Sevick-Muraca, EM
中科院分区：
文献类型：
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作者：
Sun, ZG;Tomlin, CD;Sevick-Muraca, EM
由于多重散射和颗粒间相互作用的混杂效应，在高固体浓度下直接测量胶体悬浮液的粒径是困难的。在这项工作中，频域光子迁移（FDPM）技术，基于多重光散射，扩展到颗粒尺寸的胶体悬浮液在高体积分数相结合的一个适当的模型来考虑颗粒之间的相互作用。进行各向同性散射系数的FDPM测量以评估在1%至40%的高体积分数范围内的多分散聚苯乙烯样品的颗粒相互作用的效果。然后将各向同性散射系数与理论预测进行比较，其中包括全多分散硬球Percus-Yevick（HSPY）模型以及去耦近似和局部单分散近似模型，以考虑排除体积效应。结果表明，多分散HSPY模型是合适的占粒子的相互作用，主要是由体积排阻效应和影响光散射。在使用的多分散HSPY模型预测静态结构因子，多分散聚苯乙烯悬浮液的粒径分布（PSD）恢复在高体积分数高达40%，在两个不同的波长。我们的反演结果与在相同悬浮液的稀释样品（类似于0.01%体积的固体）上通过动态光散射测量的PSD吻合得很好。
Direct particle sizing of colloidal suspensions at high solid concentrations is difficult due to confounding effects of multiple scattering and particle interactions. In this work, the frequency domain photon migration (FDPM) technique, based upon multiple light scattering, is extended for particle sizing of colloidal suspensions at high volume fractions by combining an appropriate model to account for particle interactions. FDPM measurements of isotropic scattering coefficients were conducted to assess the effect of particle interactions of polydisperse polystyrene samples at high volume fractions ranging from 1% to 40%. The isotropic scattering coefficients were then compared with the theoretical predictions which include the full polydisperse hard sphere Percus-Yevick (HSPY) model as well as the decoupling approximation and the local monodisperse approximation models to account for excluded volume effects. Results show that the polydisperse HSPY model is suitable for accounting for particle interactions which predominately arise from volume exclusion effects and which influence light scattering. Upon use of the polydisperse HSPY model to predict static structure factors, the particle size distribution (PSD) of polydisperse polystyrene suspensions was recovered at high volume fractions up to 40% at two different wavelengths. Our inversion results agree well with PSD measured by dynamic light scattering at a diluted sample of the same suspensions (similar to0.01% volume of solids).