Enhancement Of Mechanical Strength Of Materials Through 2d Nanofillers And 3d Nanostructure
Prof. Seokwoo Jeon
Department of Materials Science & Engineering, KAIST
Graphene Research Center, KINC, KAIST
Date & Time
Room 7-37, Haking Wong Building, HKU
Mechanical strengths of materials are generally determined by their compositions and its microstructure. The pursuit of ultrastrong nanofillers in composite material research is related to the former and the optimization of passive processing conditions (i.e. temperature, time, and etc.) is more relevant to the latter. My research group at KAIST has focused on, and invented, the fabrication of non-oxidized graphene flakes (NOGFs) and the production of highly periodic 3D nanostructures in large area and volume through Proximity field nanoPatterning (PnP). The NOGFs generated from graphite intercalation compound (GIC) has superior physical properties by minimizing graphene oxidation. The first half of my talk will explain how the physical properties of NOGFs as nanofillers improve the strength of both metal/graphene and polymer/graphene composites. Still the remaining issue of the nanofillers are the limit of loading contents due to severe agglomeration and the lack of percolation network where transport of mechanical, thermal, and electrical load will be carried. Our recent results of using the 3D nanostructures as a template, infiltration of various materials such as polymer, ceramic, and metal can answer those challenges. The highly porous submicron porous 3D materials are not only enhance mechanical properties and functionalities but also can serve as a guide to locate those nanofillers as designed. Example of mechanically enhanced layered materials via alternating lamination of target materials (metal/ceramic) demonstrate an ideal polymer nanocomposite with a uniform distribution of three-dimensional (3D) continuous ceramic nanofillers, which allows extremely high loading (> 15 vol %) in the polymer matrix without any concern of aggregation and loss in transparency. Some other examples will convince you our 3D nanostructure is an active route to control mechanical strengths which was never possible through the control of the passive processing conditions.
Prof. Seokwoo Jeon is Chair Professor of Materials Science & Engineering at Korea Advanced Institute of Science and Technology, South Korea.
His research goals are exploring novel electronic, mechanical, and optical properties from those nanomaterials and employing those materials in real world application. Currently his research focuses on synthesis and applications of low dimensional materials including graphene, carbon nanotubes, BN, and MoS2, and fabrication of 3D nanostructures using various metallic or ceramic materials and applications.
He has produced more than 120 publications and 80 patents in his research fields. He has been a board member of numerous academic societies, and a session organizer or organizing committee of international conferences such as ICCM, ACCM, and MRS. Presidential early-career scientist award from the Korean Academy of Science and Technology (KAST) represents his numerous academic awards and honors in recent years. In 2017, he has appointed as a founding member of the Young Korean Academy of Science and Technology (Y-KAST) and become a director of Advanced MEMS GC Center for Drug Detection.