应我院路晓艳副教授邀请，休斯顿大学Li SUN教授将于近日访问我校并做学术报告，欢迎对此感兴趣的老师和同学参加。
报告人：休斯顿大学Li SUN教授
报告题目：New Generation of Dissolvable Alloys and Polymers
报告时间：2018年12月24日（星期一）上午9：00-10：30
报告地点：哈工大土木学院502室
New Generation of Dissolvable Alloys and Polymers
ABSTRACT: Conventional wisdom is that the more stable and strong of an engineering material, the better performances and wider applications of such a material. While this is generally true, degradable materials are finding their ways into our daily life, mainly in the areas of environmental friendly polymers and bio-degradable alloys for certain medical devices. But except for these limited applications, it is safe to say that degradable materials remain understudied For this talk, we will present the recent research and development of magnesium based alloys and a PVA family of polymer that can sustain extreme pressure (900MPa) and temperature (120oC) and disintegrate after use. Combination of the two new types of materials leads to the development of revolutionary dissolvable hydraulic fracturing plugs (frac plugs) which eliminate the need for a separate milling intervention to achieve a full-bore inner diameter flux after fracturing. The Mg based dissolvable metals can have better mechanical performances than the current glass fiber reinforced polymer composite materials, and the PVA based polymers can be completely dissolved in water. Tuning the chemistry, processing and heat treatment and thus the microstructure of Mg alloys allows the wide range of adjustment of metal strength, ductility and electrochemical dissolution rate. In the meanwhile for the PVA, peculiar effects of water induced a plastic to elastic transition which is still under investigation. Considering the fact that the replacement of conventional composite and rubber with dissolvable alloys and elastomer can lead to new frac plug design, this project can lead to the production of high performance degradable/dissolvable frac plugs with new feature and designs.
Li Sun教授简介：
Biography: Dr. Li Sun is currently an Associate Professor of Mechanical and Materials Engineering at the University of Houston. He is also a faculty member at the Texas Center for Superconductivity (TcSUH) and the Subsea Engineering at UH. Dr. Sun received his B.S. degree in physics from Nanjing University in 1993 and a Ph.D. degree in Materials Science and Engineering from Johns Hopkins University in 2002. He holds the Bill D. Cook Professorship and is currently a Siyuan professor in Physics at Nanjing University. Dr. Sun’s main research interest is in the general area of nanomaterials fabrication, manipulation and application. His current research projects include multifunctional polymer composites, spintronics; ferroelectric materials, application of nanostructure materials in sensors and biomedical devices. He has published more than 80 papers on SCI journals with an H-index of 20.
孙力副教授1993年本科毕业于南京大学物理系，1993年至1997年师从闵乃本院士直博，1997年进入约翰霍普金斯大学学习，分别于1999和2002年获材料科学与工程系硕士和博士学位。2003年进入美国休士顿大学工作，2009年起担任该校终身副教授。孙力副教授的研究领域是功能材料和器件制备及应用，目前的科研项目包括：磁性纳米材料的制备、操控和生物医学应用；铁电、压电薄膜器件的研发；多功能高分子纳米复合材料及传感器件的研发等。孙教授在功能材料和器件领域发表了超过70篇SCI论文，论文被引用超过900次，H-因子达20。
