油酸-正丙醇-水无表面活性剂反相微乳液电导研究.pdf

第23卷第12期
化学研究与应用
Vol 23.No 12
2011年12月
Chemical Research and Application
Dec. 201 1
文章编号:1004-1656(2011)12-159906
油酸-正丙醇-水无表面活性剂反相微乳液电导研究
王小玉,侯万国
(青岛科技大学化学与分子工程学院,国家生态化工培育基地,山东青岛266042)
摘要:本文对油酸-正丙醇水三元体系的相行为进行了研究,表明可形成微乳液。由于体系中无传统表面活
性剂,故所形成的微乳液为无表面活性剂徽乳液。在反相微乳液区,固定正丙醇/油酸体积比(Rpo)为3:5、
1:1和2:1,考察了体系电导率(x)随分散相体积分数()的变化,结果表明κ随Φ。的增大先缓慢增加,后
急剧增大,符合渗滤特征。采用电荷涨落模型在低2值范围内估算出液滴流体力学半径(R)为1.35~1.85
nm,随值的增大R有所增大。采用渗滤模型探讨了其导电机理,Rpo为3:5、1:1和2:1时拟合出的渗
滤特征指数(ル和s)分别为μ=1.28、5=0.49,=1.31、5=0.51和μ=1.50、s=0.73,表明所研究体系符合静态
渗滤模型。电导率的研究结果表明,无表面活性剂微乳液体系的电导行为与有表面活性剂微乳液体系相似。
关键词:反相徹乳液;电导率;无表面活性剂微乳液;电荷涨落模型;渗滤模型
中图分类号:0647.2文献标识码:A
Study on the electrical conductivity of reverse surfactant-free microemulsion
composed of oleic acid, propanol, and water
WANG Xiao-yu, HOU Wan-guo
State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering
Qingdao University of Science and Technology, Qingdao 266042, China
Abstract Generally, a microemulsion consists of oil, water, surfactant and sometimes cosurfactant Herein, we report a novel surfac-
tant-free microemulsion(dened as ME), consisting of oleic acid( oil phase), water and propanol without the amphiphilic molec-
ular structure of traditional surfactant. The phase behavior of the ternary system was investigated and a single-phase microemulsion
reg on and a two-phase reg on were orme In the reverse microemulsion region, the vaiation of electical onuctiviy()as a fun-
tion of droplet volume fraction( a ) was examined at two constant propanol/oleic acid volume ratios(RP/ )of 3: 5,1 1 and 2: I
respectiely. Te esul s show that with the increase of a, the k values increase slowly, followed by a sharply increase, which is
consistent with percolation caracter On the basis of charge fluctuation model, the hydrodynamic radius(R)of droplets were esti
mated to be 1. 35-1.85 nm, and the R, value increase with increasing a The conductive mechanism of the reverse SEME was in-
vest gaed ation mel a t was fu ha it mi t be es be wh atic ation model The electical onductivity
behaviour of uraca- e microemulsion is miar e raditional microemulsion containing surfactant
Key words reverse microemulsion; conductivity u fac an-e microemulsion; charge fluctuation model percolation model
收稿日期:2011-03-15;修回日期:201104-411
基金项目:国家自然科学基金(20953003)项目资助;山东省自然科学基金(2008B08和2009ZRBO1722)项目资助;山东省泰山学者基金
(:20070713)项目资助
联系人简介:侯万国(1964-),男,教授,主要从事胶体与界面化学方面研究。Email:wuhou@sdu.edu.cn