Force measurement between mica surfaces in electrolyte solutions

作     者：赵古田 郭纬川 谭启檐 裘英华 阚亚鲸 陈云飞 倪中华 Zhao Gutian;Guo Weichuan;Tan Qiyan;Qiu Yinghua;Kan Yajing;Chen Yunfei;Ni Zhonghua

作者机构：东南大学江苏省微纳生物医疗器械设计与制造重点实验室南京211189 东南大学MEMS教育部重点实验室南京210096 

基　　金：The National Basic Research Program of China(973 Program)(No.2011CB707605) the National Natural Science Foundation of China(No.50925519,50821063) 

出 版 物：《Journal of Southeast University(English Edition)》 (东南大学学报（英文版）)

年 卷 期：2013年第29卷第1期

页      码：57-61页

摘      要：The forces between two molecularly smooth mica surfaces are measured in monovalent and divalent cations electrolyte solutions by a surface force apparatus （SFA）. The properties of K＋, Na＋, and Mg2＋ between molecularly smooth mica surfaces are investigated. The Derjagui-Landau- Verwey-Overbeek （DLVO） force and the hydration force are detected in the experiment. The results show that in lower concentrations of a monovalent electrolyte solution （about 10-4 mol/L）, the force curves are completely in good agreement with those computed by the DLVO theory. However, additional short-range repulsive forces which deviate from the DLVO theory are observed when the concentrations of cations are above the critical bulk concentration, which is different for each electrolyte. The results show the properties of these cations on both the screening effect adsorbed on the mica surface and the hydration in solution. From the results, the interaction energy between two hydrated ions of potassium or sodium can also be estimated.

主 题 词：surface force apparatus (SFA) DLVO force hydration force screening effect 

学科分类：07[理学] 070203[070203] 0702[理学-物理学类] 

核心收录：

D　O　I：10.3969/j.issn.1003-7985.2013.01.012

馆 藏 号：203648186...