Dielectric relaxation of suspension of polystyrene-poly (butyl acrylate) (PS-PBA) particles and dielectric model analysis: Electrical and electrokinetic parameters
Dielectric relaxation of suspension of polystyrene-poly (butyl acrylate) (PS-PBA) particles and dielectric model analysis: Electrical and electrokinetic parameters
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聚苯乙烯-聚丙烯酸丁酯（PS-PBA）颗粒悬浮液的介电弛豫和介电模型分析：电气和电动参数
DOI：
10.1016/j.colsurfa.2016.09.077
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Kongshuang Zhao
中科院分区：
文献类型：
--
作者：
Mingjuan Han;Huarui Wang;Jiaoyang Li;Kongshuang Zhao
在40 Hz ~ 110 MHz频率范围内，研究了粒径为120 nm的单分散聚苯乙烯-聚丙烯酸丁酯（PS-PBA）悬浮液的介电行为。同时观察到了两个显著的介电弛豫现象，并利用著名的爱因斯坦方程和Grosse理论分析了弛豫机制。同时，利用Dukhin-Shilov双电层理论验证了介质的介电常数随KCl浓度和介质体积分数的变化规律，结果表明，介质的弛豫频率和介电增量随KCl浓度和介质体积分数的变化趋势与Dukhin-Shilov理论对宽范围介质的预测相一致。在此基础上，利用Hanai理论计算了合理的相参数（ε p，κ p，ε a，κ a和ε b）。最后，在介电分析的基础上，利用界面电动力学方程，得到了PS-PBA微球在不同浓度KCl电解质溶液中的界面电参数（λ，σ，ε）。更重要的是，DRS的计算值与Zeta电位仪的测量值（-48.8 mV）吻合较好，从而证明DRS是一种非侵入式研究分散体系界面电参数的可行方法。
Dielectric behaviors of suspensions of monodisperse polystyrene-poly (butyl acrylate)(PS-PBA) particles with the radius of 120 nm were thoroughly investigated in the frequency range of 40 Hz to 110 MHz. Two remarkable dielectric relaxations were simultaneously observed, and the well-known Einstein equation and Grosse theory were employed to analysis the relaxation mechanism. Meanwhile, Dukhin-Shilov theory about the thin double layer of colloid dispersion was employed to verify the effects of volume fraction and KCl electrolyte concentration on dielectric parameters of DRS. The results showed that the changing trend of relaxation frequencies and dielectric increments from experimental data with KCl concentration and volume fraction was well consistent with the prediction of the wide-range DRS of Dukhin-Shilov theory. In addition, the reasonable phase parameters (ε p, κ p, ε a, κ a and ϕ) were calculated by Hanai theory on the basis of the suggested dielectric model. Finally, the interfacial electrical parameters (λ, σ, ζ) of PS-PBA microspheres dispersed in different concentrations of KCl electrolyte solution were obtained by electrodynamics equations about interface on the basis of dielectric analysis. More importantly, the calculated value of ζ well agreed with the value (-48.8 mV) measured by Zeta potential analyzer, thus the result proved that DRS was a feasible method to investigate the interfacial electrical parameters of disperse system in a non-intrusive way.