International Soft Matter and Nanomaterials Seminar Series

国际软物质及纳米材料系列讲座

报告题目：Structural analysis of crystalline polymers by electron microscopy, electron diffraction and AFM techniques

报告人：Bernard Lotz 教授（法国Institute of Charles Sadron - CNRS）

地点：校行政楼一楼报告厅

时间：2015年12月7日（周一）下午2点

讲座摘要：

Crystalline polymers are made of small (several micrometers) and thin (tens of nanometers) lamellae. Electron microscopy is therefore an ideal tool for their investigation. Upon crystallization from the bulk, crystalline polymers produce spherulites with a complex structure. However, crystallization from solution or in thin films generates single crystals that are well adapted for structural investigations. The presentation will illustrate several contributions of electron microscopy (bright and dark field, electron diffraction) in the investigation of crystalline polymers. The presentation will be very didactic. It will focus on:

- The structural analysis of metastable phases using epitaxial crystallization, electron diffraction and AFM to observe the structure of polymers with methyl group resolution (≈ 4Å);

- The concept of frustrated packing in crystalline polymers ;

- The use of dark field imaging to visualize and investigate the growth and phase transformations in single crystals;

- The investigation of the fold structure, i.e. of the amorphous layer, that is responsible, e.g. for twisted and scrolled lamellar morphologies.

学习工作简历：

Professor Bernard Lotz is Director of Research (Emeritus) at the Centre National de la Recherche Scientifique (CNRS), the French academic organization devoted to fundamental research. He spent his career at the Institute Charles Sadron in Strasbourg, a laboratory owned and run by the CNRS. He has held a number of positions as a visiting scientist and invited professor in Universities and ResearchCenters in the USA(ATT-Bell Laboratories, CaseWestern ReserveUniversity, University of Akron, MIT), Canada, the Far East, and in several EuropeanUniversities and Institutes. He received the 1973 Prize of the French Polymer Group and the 1989 Fraser P. Prize from the University of Amherst. He has been elected a Fellow of the American Physical Society in 1986 and is a member of the advisory editorial board of several scientific journals. His major research interests include the phase transitions (glass transition, crystallization, and melting) and the structure and morphology of crystalline polymers and biopolymers at different length scales, ranging from the chain conformation and the structure at the unit-cell level to the spherulite and bulk morphology both in their spontaneous state or as modified by appropriate additives. He is the author or coauthor of nearly 300 research papers and book chapters.