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本文利用相位调制光纤低相干动态光散射装置,研究了不同物质量浓度下电解质(NaCl及BaCl2)对浓悬浮液中聚苯乙烯胶体颗粒扩散特性的影响.实验结果表明,当电解质浓度低于0.01 mol/L时,恒温条件下浓悬浮液中聚苯乙烯胶体颗粒扩散系数随电解质离子浓度以及离子化合价的增大而增大,实验测量得到的扩散系数与Stern模型所得到的扩散系数符合较好.
In this paper, phase-modulated fiber low coherence dynamic light scattering device was used to study the effect of electrolyte (NaCl and BaCl2) on the diffusion characteristics of polystyrene colloidal particles in concentrated suspension under different mass concentration.The experimental results show that when the electrolyte concentration is less than 0.01 mol / L, the diffusion coefficient of polystyrene colloidal particles in the suspension at constant temperature increases with the increase of electrolyte ion concentration and ionization valence, and the experimental diffusion coefficient is in good agreement with the diffusion coefficient obtained from Stern model .