RESEARCH FOR SELF-ORGANIZATION OF SURFACTANTS AT LIQUID/LIQUID INTERFACE BASED ON NONLINEAR DYNAMICAL PROPERTIES

基于非线性动力学性质的表面活性剂液/液界面自组织研究

基本信息

批准号：
12650746
负责人：
SHIOI Akihisa
金额：
$ 2.3万
依托单位：
YAMAGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

Research results are classified into following three categories. The first one takes the most fundamental position of this research. This category deals with self-assembly of surfactants under monotonous relaxation from nonequilibrium to equilibrium states. For example, research on spontaneous vesicle formation, formation of nano-scale silica in reverse micelles and simple estimation of desorption rate using Marangoni effect are involved. The second is to study mechanism of nonlinear oscillation of interfacial properties. We found out one of the simplest systems which can produce the oscillation. This system is composed of phosphoric surfactant and calcium ion. We discussed physicochemical aspects of this oscillatory dynamics and proposed following scenario. Surfactants are adsorbed at interface, and some of them can react with calcium ion. However, homogeneous mixture of them is thermodynamically unstable, and spinodal decomposition at interface begins. Resultantly, domains enriched with a kind of surfactant appear. This domain-formation controls adsorption and desorption rate cooperatively with mass-transfer between bulk phase and interface. As the last one, we calculated above process numerically on the basis of time-dependent Ginzburg-Landau equation. The results of calculation and experiments exhibit interesting analogue. As a result of all, we considered that we could obtain fundamental knowledge for "self-organization of surfactants at liquid/liquid interface based on nonlinear dynamical properties".

研究成果分为以下三类。第一个在本研究中占据最基本的地位。该类别涉及表面活性剂在从非平衡状态到平衡状态的单调松弛下的自组装。例如，涉及自发囊泡形成、反胶束中纳米级二氧化硅的形成以及利用马兰戈尼效应简单估计解吸速率的研究。二是研究界面性质非线性振荡机理。我们发现了可以产生振荡的最简单的系统之一。该体系由磷酸表面活性剂和钙离子组成。我们讨论了这种振荡动力学的物理化学方面，并提出了以下方案。表面活性剂吸附在界面处，部分表面活性剂能与钙离子发生反应。然而，它们的均匀混合物在热力学上不稳定，并且在界面处开始旋节线分解。结果，出现了富含一种表面活性剂的区域。这种域的形成与体相和界面之间的传质协同控制吸附和解吸速率。作为最后一个，我们基于瞬态Ginzburg-Landau方程对上述过程进行了数值计算。计算和实验的结果显示出有趣的相似之处。因此，我们认为可以获得“基于非线性动力学性质的表面活性剂在液/液界面的自组织”的基础知识。