Dynamic Properties of the Aqueous Liquid -Vapor Interfacial Region

在分析和表面化学项目的支持下，加州大学伯克利分校的Marin Majda教授正在研究水在空气/水界面上的粘弹性性质。以TEMPO(2，2，6，6-四甲基-1-哌啶氧自由基)的两亲性衍生物为探针，采用电化学和电子自旋共振(ESR)技术。通过选择浸入深度逐渐增大的不同极性基团，ESR和电化学获得的侧向扩散常数可用水界面区域的表观粘度来解释。一个重点领域是在界面过程研究中实施ESR Heisenberg自旋交换。正在追求的实验策略是使人们能够对水的界面有新的见解，例如由乳状液、大气中的水滴和与水接触的磷脂膜形成的界面。

With the support of the Analytical and Surface Chemistry Program, Professor Marcin Majda of the University of California-Berkeley is investigating the viscoelastic properties of water at the air/water interface. Electrochemistry and electron spin resonance (ESR) techniques are being employed with amphiphilic derivatives of TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy free radical) as probes. By selecting different polar head groups exhibiting progressively greater immersion depth, the lateral diffusion constants obtained by ESR and electrochemistry are being interpreted in terms of the apparent viscosity of the aqueous interfacial region. An area of focus is on the implementation of ESR Heisenberg spin exchange in the study of interfacial processes.The experimental strategies being pursued are enabling new insights into aqueous interfaces, such as those formed by emulsions, water droplets in the atmosphere and phospholipid membranes contacting water.