Low-frequency dielectric dispersion in suspensions of ion-exchange resins
Low-frequency dielectric dispersion in suspensions of ion-exchange resins
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DOI：
10.1021/j100678a012
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发表时间：
1971-04
期刊：
影响因子：
--
通讯作者：
C. Einolf;E. Carstensen
中科院分区：
文献类型：
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作者：
C. Einolf;E. Carstensen
提出了一个模型来解释具有均匀分布的固定电荷中心的多孔颗粒悬浮液的介电性质。该理论预测在低频下具有非常大的有效介电常数的弛豫。低频介电常数的大小与多孔材料中颗粒的大小和固定电荷浓度的平方根成正比。弛豫频率与反离子迁移率直接相关，与粒子大小的平方成反比。离子交换树脂悬浮液的实验验证了理论模型的定性和定量。微米级离子交换树脂颗粒的有效介电常数高达10？
A model is proposed to explain the dielectric properties of suspensions of porous particles with uniformly dis-tributed fixed charge sites. The theory predicts a relaxation with very large, effective, dielectric constants at low frequencies. The magnitude of the low-frequency dielectric constant is proportional to the size of the particle and the square root of the fixed charge concentrationin the porous material. The relaxation frequency depends directly on counterion mobility and is inversely proportional to the square of particle size. Experimental tests with suspensions of ion-exchange resins have provided quantitative as well as qualitative con-firmation of the theoretical model. The effective dielectric constants of micron sized ion-exchange resin particles are as high as 10®.