十六烷-水乳液界面电位极大值的理论计算  

Theoretical calculation of the maximum value of potential at the interface of hexadecane-water emulsion

作　　者：杨方源 吴豪 朱源哲 祖力胡马·吾买尔 余舒锦 YANG Fang-Yuan;WU Hao;ZHU Yuan-Zhe;WUMAIER Zulyhumaer;YU Shu-Jin(College of Mathematics and Physics,Xinjiang Agricultural University,rümqi 830052,China)

机构地区：[1]新疆农业大学数理学院,乌鲁木齐830052

出　　处：《原子与分子物理学报》2020年第4期508-516,共9页Journal of Atomic and Molecular Physics

基　　金：新疆维吾尔自治区级大学生创新创业训练计划项目(S201910758056);新疆维吾尔自治区自然科学基金资助项目(2018D01A14)。

摘　　要：基于Gouy-Chapman模型,O’Brien-White方法能够用来解释电迁移率和电位与离子强度的依赖关系出现极大值的现象,借助O’Brien-White方法计算了电位随着离子强度变化的关系,并且通过反推电迁移率的值得到了电位的值,解释了离子强度对界面电势的影响.通过结合十六烷乳液的电迁移率在不同离子强度下随着体系pH值和SDS浓度变化的实验数据,得出电位是否出现极大值依赖于系统参数.研究结果为分子层次上进一步丰富和完善界面双电层理论提供了实验和理论支持.The O’Brien-White approach based on the Gouy-Chapman model could be used to understand the maximums in both the electrophoretic mobility and zeta potential curves as a function of ionic strength.The report obtained from calculation on the ionic strength dependent zeta potential curves based on the O’Brien-White approach.The value of zeta potential was obtained by inversed deduction from the value of electrophoretic mobility,which could interpret the influence of ionic strength on the surface potential well.The experimental results were also given based on the ionic strength dependent electrophoretic mobility of the hexadecane droplets in the hexadecane-water emulsions from various experimental environments,including changing the pH of the emulsions or adding sodium dodecyl sulphate(SDS)surfactant with different concentrations into the emulsions.Combined the experiment with theoretical simulation,it was confirmed that both the existence and absence of such a maximum phenomenon was system dependent.This work provides significant theoretical and experimental details for further understanding on the electric double layer theory in the molecular level.

关 键 词：电迁移率 电位 十六烷乳液 离子强度 双电层理论 

分 类 号：O65[理学—分析化学]