报告人：YurisDzenis教授（University ofNebraska-Lincoln, USA）
报告题目：MolecularMechanisms of Simultaneously High Strength and Toughness in ContinuousNanofibers
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：华南理工大学五山校区北区科技园2号楼324报告厅
报告摘要：
Classicalmanufacturing techniques of advanced polymer fibers rely on a combination ofhigh polymer crystallinity and high degree of macromolecular alignment toachieve superior mechanical properties. As a consequence, high-performancefibers such as PPTA and UHMWPE possess high strength, but low strain to failureand toughness. Our mechanical and structural analysis of electrospun nanofibers(NFs) in the ultrafine (50-250 nm) diameter range showed extraordinarysimultaneous improvements in strength, modulus, and toughness. The finestnanofilaments exhibited strength on the par with that of advanced structuralfibers, while exceeding their toughness by over an order of magnitude. This lecturewill discuss supramolecular mechanisms of such an unusual mechanical behavioras well as review methods of structural characterization of ultrafinecontinuous nanofibers. Prospects and impacts on wellbeing and sustainability offuture textiles will be discussed.
个人简介：
Dr. Yuris Dzenis is aMcBroom Professor of Engineering at UNL. He has earned his PhD in Aerospace andMechanical Engineering from the University of Texas, PhD in Physics andMechanics of Polymers from Latvian Academy of Sciences, and MS in Physics(Electrodynamics of Continua) from Latvian University. He has been a researchfellow at the Institute of Polymer Mechanics, Latvian Academy of Sciences, aresearch scientist at the Institute of Polymer Science, University of Akron andthe Institute of Composite Materials, University of Kaiserslautern, and avisiting professor at Doshisha University, Kyoto (twice), University ofCanterbury, 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, andcharacterization of advanced nanofibers, composites, and products. He hasdeveloped and studied a number of unusual composite materials includingcomposites with aggregating and hollow inclusions, particulate/fiber hybrids,high-performance continuous polymer, carbon, and ceramic nanofibers,hierarchical nano/micro fiber composites, and mechanically biomimetic softnon-linear nanofilamentary vascular grafts. He has introduced and developedseveral nanomanufacturing and hybrid manufacturing technologies to produce functionalnanomaterials. He has introduced a concept of nanoreinforcement of interfacesand pioneered development of cost-effective delamination resistant nanoengineeredstructural composites. Most recent advances included the discovery andexplanation of simultaneously high strength and toughness of ultrafinecontinuous nanofibers. Dr. Dzenis is a member of six professionalsocieties and has been an invited or plenary speaker at numerous internationalconferences on nanotechnology, materials, mechanics, NDE, and composites. Hehas written two invited perspectives on continuous nanofibers and structuralnanocomposites for Science. Hecurrently serves as a chair of the NDPD Division of ASME and is an associateeditor of three journals. Research fromDzenis group was featured on covers by ACSNano, Nature (The Year in Science special issue), Advanced Functional Materials, Polymer, ACS Applied Materials& Interfaces, and highlighted by Nature and the National ScienceFoundation, among other outlets.
