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[9.13]NS Forum No. 286-Prof. Binhua Lin,Opportunities for Studying Liquid Interfaces at Synchrotrons
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| 2017-09-12 | 浏览次数: | 文章来源: | 【大 中 小】 |
中科院纳米生物效应与安全性重点实验室
纳米技术论坛(NS Forum No. 286)
第286期学术报告会通知
演讲者：Prof. Binhua Lin, 美国芝加哥大学
题目：Opportunities for Studying Liquid Interfaces at Synchrotrons
时 间：2017年9月13日 (星期三) 9:00am
地 点：中科院高能所主楼415会议室
主持人：王黎明 副研究员
报告摘要：Liquid interfaces provide a dynamic platform for the assembly of soft materials. A known molecular composition can be added to the interface, the surrounding environment can be controlled (pH, ionic content, temperature, viscosity, interfacial electric potential), the interfacial density varied, and molecular species can be added to the neighboring bulk phases to bind to or chemically interact with the assembly in a controlled manner. The dynamic re-organization of the interfacial assembly in response to these perturbations provides a paradigm for materials interactions that mimic similar dynamic structure in bio-systems. Understanding the fundamental microscopic structure of liquid interfaces, and molecular films confined to these interfaces, is essential to address many technological issues faced by the world, including those in energy, health and the environment. Synchrotron X-ray surface scattering techniques are the tool of choice for structural investigations of liquid surfaces and interfaces by virtue of their sensitivity to atomic and molecular length scales and their ability to distinguish the surface structure from that of the bulk. In this talk I will first present an overview of the liquid surface science program at ChemMatCARS (Sector 15 of the Advanced Photon Source, USA) with a few examples highlighting the work on: (1) phospholipid recognition in structural immunology; (2) liquid surface-enabled directed assembly of molecules and nanoparticles for tailored functionality; and (3) metal ion extraction at the liquid/liquid interface vital to environmental and radioactive waste cleanup. I will then describe a suite of techniques that are used in liquid surface scattering at our facility, including both established ones, such as X-ray reflectivity, grazing-incidence X-ray diffraction or grazing-incidence small-angle X-ray scattering, and off-specular scattering), as well as some newly developed ones, such as time-resolved measurements on the sub-minute time scale, surface fluorescence spectroscopy, resonant or anomalous surface scattering, and high energy pair-distribution function measurements. These techniques have been indispensable in the investigation of the fundamental science of soft interfaces and in the study of model systems for natural processes important in physical, chemical, biological, and technological systems.
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