利用低相干光纤动态光散射研究胶体颗粒的布朗聚集。

Study of colloidal particle Brownian aggregation by low-coherence fiber optic dynamic light scattering.

机构信息

School of Physics and Electronics, Central South University, Changsha 410083, China.

出版信息

J Colloid Interface Sci. 2012 Jun 15;376(1):322-6. doi: 10.1016/j.jcis.2012.02.061. Epub 2012 Mar 3.

DOI:10.1016/j.jcis.2012.02.061

Abstract

The aggregation kinetics of particles in dense polystyrene latex suspensions is studied by low-coherence fiber optic dynamic light scattering. Low-coherence fiber optic dynamic light scattering is used to measure the hydrodynamic radius of the aggregates. The aggregation kinetics data obtained can be fitted into a single exponential function, which is the characteristic of slow aggregation. It is found that the aggregation rate of particles increased with higher electrolyte levels and with larger particle concentrations. The experimental results can be explained by use of the Derjaruin-Landau-Verwey-Overbeer (DLVO) theory.

摘要

采用低相干光纤动态光散射研究了密聚苯乙烯乳胶悬浮液中颗粒的聚集动力学。低相干光纤动态光散射用于测量聚集体的水动力半径。获得的聚集动力学数据可以拟合为单个指数函数，这是缓慢聚集的特征。结果表明，随着电解质水平的提高和颗粒浓度的增大，颗粒的聚集速率增加。实验结果可以用德贾林-兰德韦尔-奥弗贝（DLVO）理论来解释。