Journal of Colloid and Interface Science 2012-06-15

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

Hui Xia, Ru Yi Pang, Rui Zhang, Cai Xia Miao, Xiao Yun Wu, Xue Shun Hou, Cheng Zhong

Index: J. Colloid. Interface Sci. 376(1) , 322-6, (2012)

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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.Crown Copyright © 2012. Published by Elsevier Inc. All rights reserved.