Study on Molecular Dynamics near Solid-Liquid Interface by Evanescent Light Scattering Spectroscopy

倏逝光散射光谱研究固液界面附近的分子动力学

基本信息

批准号：
10450033
负责人：
TAKAGI Kenshiro
金额：
$ 9.47万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450033/
关键词：
Evanescent light Light scattering Molecular dynamics near interface Diffusion of particles Frustrated total reflection Brownian motion 動的光散乱界面特異構造界面近傍粘性動的分子物性

项目摘要

Recently, various kinds of strange microstructures of molecular association formed near the liquid-solid interface attract great interests both in the physical and industrial fields. We developed a new technique of Dynamic Evanescent Light Scattering Spectroscopy to investigate the structure and dynamics of liquid materials in the vicinity of solid-liquid interface. Dynamic light scattering measurement has been an effective technique to study the molecular dynamics in liquids through the behavior of the thermal diffusion, phonons and Brownian motion excited by the thermal fluctuation. Evanescent light is the leaky optical wave generated in the vicinity of the interface at the total reflection condition. Since the penetration length of the evanescent light is in the order of several tens of nm, it would be an effective probe to pick up the information on the near-interface region. The purpose of this study is to establish the dynamic evanescent light scattering method as a powerful tool of investigating the interface physics of soft materials. We also aimed to study the physical interaction between the interface and molecules or molecular association from the microscopic viewpoint.As a result of the study we successfully developed two different light scattering measurement systems; one is the evanescent light scattering system and the other is the frustrated evanescent light scattering system. These two methods are different in their principles and give complementary information on the dynamics at the interface region. We revealed the diffusion behavior of the micro particles, which is suppressed by the hydrodynamic interaction from the solid wall. The experimental results ape well explained by the fluctuation dissipation the fluctuation dissipation theory taking the hydrodynamic effect into account. The Evanescent Light Scattering would be a powerful tool for the investigation of the strange structure of the soft complex materials near the interface.

最近，在液体固体界面附近形成的各种分子关联的奇怪微观结构引起了物理和工业领域的极大兴趣。我们开发了一种动态逃生光散射光谱的新技术，以研究固定液体界面附近液体材料的结构和动力学。动态光散射测量已经是一种通过热扩散，声子和布朗运动的行为来研究液体分子动力学的有效技术。 Evanescent Light是在总反射条件下在界面附近产生的泄漏光波。由于逃生光的穿透长度按几十nm的顺序，因此可以访问有关近距离区域的信息是有效的探测器。这项研究的目的是建立动态逃生的光散射方法，作为研究软材料界面物理学的强大工具。我们还旨在从微观的角度研究界面与分子或分子缔合之间的物理相互作用。由于研究的结果，我们成功地开发了两个不同的光散射测量系统。一种是淡淡的光散射系统，另一个是沮丧的逃生光散射系统。这两种方法在其原理上是不同的，并提供有关接口区域动力学的互补信息。我们揭示了微粒的扩散行为，这被固体壁的流体动力相互作用抑制。实验结果通过波动耗散很好地解释了猿类的波动耗散理论考虑了流体动力效应。回避的光散射将是研究界面附近柔软复杂材料的奇怪结构的强大工具。