报 告 人：Yuris Dzenis教授（University of Nebraska-Lincoln, USA）
报告题目：Molecular Mechanisms of Simultaneously High Strength and
Toughness in Continuous Nanofibers
报告邀请人：程正迪 院士
报告时间：2025年5月19日（星期一）上午10：00
报告地址：精品熟妇Av免费久久久久五山校区北区科技园2号楼324报告厅
报告摘要：
Classical manufacturing techniques of advanced polymer fibers rely on a combination of high polymer crystallinity and high degree of macromolecular alignment to achieve superior mechanical properties. As a consequence, high-performance fibers such as PPTA and UHMWPE possess high strength, but low strain to failure and toughness. Our mechanical and structural analysis of electrospun nanofibers (NFs) in the ultrafine (50-250 nm) diameter range showed extraordinary simultaneous improvements in strength, modulus, and toughness. The finest nanofilaments exhibited strength on the par with that of advanced structural fibers, while exceeding their toughness by over an order of magnitude. This lecture will discuss supramolecular mechanisms of such an unusual mechanical behavior as well as review methods of structural characterization of ultrafine continuous nanofibers. Prospects and impacts on wellbeing and sustainability of future textiles will be discussed.
个人介绍：
Dr. Yuris Dzenis is a McBroom Professor of Engineering at UNL. He has earned his PhD in Aerospace and Mechanical Engineering from the University of Texas, PhD in Physics and Mechanics of Polymers from Latvian Academy of Sciences, and MS in Physics (Electrodynamics of Continua) from Latvian University. He has been a research fellow at the Institute of Polymer Mechanics, Latvian Academy of Sciences, a research scientist at the Institute of Polymer Science, University of Akron and the Institute of Composite Materials, University of Kaiserslautern, and a visiting professor at Doshisha University, Kyoto (twice), University of Canterbury, Christchurch, New Zealand (Erskine Fellow – three times), University of Paris-VI (Sorbonne-U, twice), and University of Trento, Italy. Dr. Dzenis’ research interests are in design, manufacturing, modeling, and characterization of advanced nanofibers, composites, and products. He has developed and studied a number of unusual composite materials including composites with aggregating and hollow inclusions, particulate/fiber hybrids, high-performance continuous polymer, carbon, and ceramic nanofibers, hierarchical nano/micro fiber composites, and mechanically biomimetic soft non-linear nanofilamentary vascular grafts. He has introduced and developed several nanomanufacturing and hybrid manufacturing technologies to produce functional nanomaterials. He has introduced a concept of nanoreinforcement of interfaces and pioneered development of cost-effective delamination resistant nanoengineered structural composites. Most recent advances included the discovery and explanation of simultaneously high strength and toughness of ultrafine continuous nanofibers. Dr. Dzenis is a member of six professional societies and has been an invited or plenary speaker at numerous international conferences on nanotechnology, materials, mechanics, NDE, and composites. He has written two invited perspectives on continuous nanofibers and structural nanocomposites for Science. He currently serves as a chair of the NDPD Division of ASME and is an associate editor of three journals. Research from Dzenis group was featured on covers by ACS Nano, Nature (The Year in Science special issue), Advanced Functional Materials, Polymer, ACS Applied Materials & Interfaces, and highlighted by Nature and the National Science Foundation, among other outlets.