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当前位置: 首页 > 文章 > 非对称混合电解质体系中恒电荷颗粒表面与Stern电位的测定 土壤学报 2015,52 (2) 446-452
Position: Home > Articles > PRINCIPLE FOR DETERMINATION OF SURFACE POTENTIAL AND STERN PLANE POTENTIAL OF CONSTANT CHARGED PARTICLES IN ASYMMETRIC MIXED ELECTROLYTE SOLUTIONS Acta Pedologica Sinica 2015,52 (2) 446-452

非对称混合电解质体系中恒电荷颗粒表面与Stern电位的测定

作  者：
樊会敏;赵艳;刘新敏;李航;李睿;何云华
单  位：
土壤多尺度界面过程与调控重庆市重点实验室西南大学资源环境学院
关键词：
离子交换;极化作用;空间位阻;表面电位
摘  要：
双电层中的电位对研究土壤颗粒相互作用、土壤中营养元素的有效性等有着重要意义。本文建立了一种测定表面和Stern面电位的新方法,当考虑离子在强表面电场中的极化作用时,准确描述了Stern面电位;当考虑离子空间位阻与极化作用的耦合时,获得了颗粒的表面电位。结果发现:只有作为点电荷的H+(无空间位阻和极化作用)才能作为信号传输表征带电颗粒表面性质,测得的表面电位约为Stern面电位的5倍;从电位分布来看,Stern层中的电位服从线性下降,而扩散层中服从Boltzmann分布,且Stern层的下降速度远远大于扩散层中电位下降速度。
译  名：
PRINCIPLE FOR DETERMINATION OF SURFACE POTENTIAL AND STERN PLANE POTENTIAL OF CONSTANT CHARGED PARTICLES IN ASYMMETRIC MIXED ELECTROLYTE SOLUTIONS
作  者：
Fan Huimin;Zhao Yan;Liu Xinmin;Li Hang;Li Rui;He Yunhua;Chongqing Key Laboratory of Soil Multi-scale Interfacial Process,College of Resources and Environment,Southwest University;
关键词：
Ion exchange;;Polarization;;Steric effect;;Surface potential
摘  要：
Potential in electric double layer is a principal parameter of significant importance in researches on particle-particle interactions and availability of nutrient elements in soil. In this study,a new method was designed to determine surface potential and Stern potential. This method can used to describe Stern potential by taking into account polarization of the strong surface electric field and to obtain surface potential of soil particles by taking into account the effect of coupling of ion steric hindrance and polarization. Tests of the method reveal that only point charge H+( no steric hindrance and polarization) can be used as signal transmission to characterize charged particle surface. The surface potential determined is 5 times as high as Stern potential. In the light of distribution of the potential,the potential declines linearly in the Stern layer,and follows the Boltzmann pattern in distribution in the diffuse layer,and the descent is much faster in the Stern layer than in the diffuse layer.

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