The Role of Coexisting Ions in a Chemical Oscillation Induced by Ionic Surfactant Molecules at a Water/Nitrobenzene Interface
The Role of Coexisting Ions in a Chemical Oscillation Induced by Ionic Surfactant Molecules at a Water/Nitrobenzene Interface
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共存离子在水/硝基苯界面离子表面活性剂分子诱导的化学振荡中的作用
DOI：
10.1021/jp022032
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发表时间：
2003
影响因子：
3.3
通讯作者：
T. Sawada
中科院分区：
文献类型：
--
作者：
Hiroharu Yui;Yasuhiro Ikezoe;Tetsuya Takahashi;T. Sawada
采用电化学电位和界面张力同时监测的方法研究了离子型表面活性剂分子在水（W）/硝基苯（NB）界面上引起的化学振荡。亲水性离子的存在下，在有机（NB）相被发现大大加速的松弛过程的电势，表明离子交换严重影响的解吸离子表面活性剂分子从界面和变形的双电层在界面处。此外，发现电势的两步弛豫，这提供了关于化学振荡中产生的电势的起源的信息。离子型表面活性剂分子在W/NB界面处的非线性振荡行为的机制被认为是在水相体相中和由于水分子水合表面活性剂分子的贡献而穿过W/NB界面的扩散速度的显著差异。
Chemical oscillation induced by ionic surfactant molecules at a water (W)/nitrobenzene (NB) interface is investigated by simultaneous monitoring of electrochemical potential and interfacial tension. The presence of hydrophilic ions in the organic (NB) phase is found to drastically accelerate the relaxation process of electrical potential, indicating that ion exchange critically affects the desorption of ionic surfactant molecules from the interface and the deformation of an electrical double layer at the interface. In addition, two-step relaxation of the electrical potential is found, that provides information on the origin of the electrical potential generated in chemical oscillations. The mechanism for the nonlinear oscillatory behavior of the ionic surfactant molecules at the W/NB interface is considered in terms of the remarkable difference in diffusion speed in the aqueous bulk phase and across the W/NB interface due to the contribution of the water molecules that hydrate the surfactant molecules.