水油界面离子行为的二次谐波研究
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- 英文论文题名：Ions at oil-water interfaces studied with second harmonic generation
- 论文作者：干为 ; 吴畏 ; 杨方源
- 英文论文作者：Wei Gan ; Wei Wu ; Fangyuan Yang ; Laboratory of Environmental Science and Technology ; Xinjiang Technical Institute of Physics & Chemistry ; Key Laboratory of Functional Materials and Devices for Special Environments ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中国科学院新疆理化技术研究所环境科学与技术研究室特殊环境功能材料与器件中科院重点实验室;
- 论文关键词：水油界面 ; 二次谐波 ; zeta电位 ; 离子 ; 表面活性剂
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十四分会：化学动力学
- 语种：中文
- 分类号：O647.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十四分会 ; 化学动力学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：178k
- 原文格式：D
- 会议级别：全国
摘要
研究水油界面离子的吸附与其相互作用等动力学行为是理解水油界面特性的一个重要方面。近期我们通过二次谐波与zeta电位测定等方法,对水油界面离子的行为进行了系列研究。对十六烷-水界面自发产生负电势的原因进行了研究,证实了OH~-在界面的自发吸附,澄清了以往研究中对此科学问题的争议1;首次得到表面活性剂在水油界面吸附过程中存在一个疏水部分主导的初始吸附过程的直接实验证据,并对吸附过程中的离子相互作用进行了分析~(2,3);在此基础上,我们证实了H~+离子在十六烷-水界面并不存在选择性吸附,与OH~-的行为大相径庭,同时我们提出了以上差异存在的分子层次的原因;通过对不同水油界面电荷与zeta电位的离子强度依赖关系进行分析,得到了不同界面的分子吸附过程在不同离子强度下存在的一些有规律的差异。
Studying dynamics including adsorption and interaction of ions at oil-water interfaces is important for understanding the interfacial properties. To study the behavior of ions at oil-water interfaces, we recently performed a series of experiments including second harmonic generation and zeta potential measurements. The reason of a negative potential at the hexadecane-water interface was studied. The enrichment of OH-at the interface was confirmed and used to clarify the controversy in literatures.~1 Direct experimental evidences of an initial step dominated by adsorption of hydrophobic part of surfactants in their adsorption at oil-water interfaces were presented for the first time. The ionic interactions in the whole adsorption process were analyzed.~(2,3) Furthermore, we found that H+ don't have specific affinities at the hexadecane-water interface although OH-do, molecular level understanding of this difference was presented. By analyzing the ionic strength dependent interfacial charge and zeta potential, ionic adsorption at different interfaces and different ionic concentrations were understood.
Studying dynamics including adsorption and interaction of ions at oil-water interfaces is important for understanding the interfacial properties. To study the behavior of ions at oil-water interfaces, we recently performed a series of experiments including second harmonic generation and zeta potential measurements. The reason of a negative potential at the hexadecane-water interface was studied. The enrichment of OH-at the interface was confirmed and used to clarify the controversy in literatures.~1 Direct experimental evidences of an initial step dominated by adsorption of hydrophobic part of surfactants in their adsorption at oil-water interfaces were presented for the first time. The ionic interactions in the whole adsorption process were analyzed.~(2,3) Furthermore, we found that H+ don't have specific affinities at the hexadecane-water interface although OH-do, molecular level understanding of this difference was presented. By analyzing the ionic strength dependent interfacial charge and zeta potential, ionic adsorption at different interfaces and different ionic concentrations were understood.
引文
[1]H.Fang,W.Wu,Y.Sang,S.Chen,X.Zhu,L.Zhang,Y.Niu and W.Gan,RSC Advances,2015 5 23578-23585.
[2]W.Wu,H.Fang,F.Yang,S.Chen,X.Zhu,Q.Yuan and W.Gan,J.Phys.Chem.C,2016 120 6515.
[3]Y.Sang,F.Yang,S.Chen,H.Xu,S.Zhang,Q.Yuan and W.Gan,J.Chem.Phys.,2015 142 224704.
[2]W.Wu,H.Fang,F.Yang,S.Chen,X.Zhu,Q.Yuan and W.Gan,J.Phys.Chem.C,2016 120 6515.
[3]Y.Sang,F.Yang,S.Chen,H.Xu,S.Zhang,Q.Yuan and W.Gan,J.Chem.Phys.,2015 142 224704.