Impact of electric field on Hofmeister effects in aggregation of negatively charged colloidal minerals

被引:0
作者
YING TANG
HANG LI
HUALING ZHU
RUI TIAN
XIAODAN GAO
机构
[1] Southwest University,Chongqing Key Laboratory of Soil Multi
[2] Chinese Academy of Sciences,Scale Interfacial Process, College of Resources and Environment
来源
Journal of Chemical Sciences | 2016年 / 128卷
关键词
Electric field; Hofmeister effects; ionic polarization; colloidal minerals; electrostatic interaction;
D O I
暂无
中图分类号
学科分类号
摘要
In this study, the aggregation kinetics of negatively charged colloidal minerals in Na++, K++, NH4+\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$_{\mathrm {4}}^{\mathrm {+}}$\end{document}, Mg2+, Ca2+ and Cu2+ solutions were measured and Hofmeister effects therein were estimated through total average aggregation (TAA) rates and critical coagulation concentration (CCC). Hofmeister effects of TAA rates increased exponentially with the increase in electric field strength, which cannot be explained by the classical theories (i.e., ionic size, hydration and dispersion forces), indicating strong electric field at colloidal surface was an indispensable factor in studying Hofmeister effects. Meanwhile, Hofmeister series of CCC values Na+> K+> NH4+>\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$_{\mathrm {4}}^{\mathrm {+}}>$\end{document} Mg2+> Ca2+> Cu2+ show fine correlation with the polarization of various cations, implying that onic polarization in strong electric field would be responsible for Hofmeister effects in aggregation of colloidal minerals, and the deduction was confirmed by the calculated results of electrostatic interactions between colloidal minerals.
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页码:141 / 151
页数:10
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