Seminar & Colloquium
[세미나: 6월 21일(화), 오후 3시] Prof. Sung Hoon Kang, Johns Hopkins University
Title
Bone-inspired materials with self-adaptable mechanical properties
Speaker
Prof. Sung Hoon Kang, Department of Mechanical Engineering, Johns Hopkins University
Biography
Sung Hoon Kang is an Assistant Professor in the Department of Mechanical Engineering, Hopkins Extreme Materials Institute and Institute for NanoBioTechnology at Johns Hopkins University. He earned a Ph.D. degree in Applied Physics at Harvard University and M.S. and B.S. degrees in Materials Science and Engineering from MIT and Seoul National University, respectively. Sung Hoon has been investigating solutions to address current challenges in engineering materials, structures and devices with applications including resiliency, sensing, energy, and healthcare. In particular, he investigates synthesis and manufacturing of materials and structures with novel properties based on principles of mechanics and physics and tools such as numerical modeling, 3D printing, 3D structural/material/mechanical characterizations, and in vitro/in vivo testing. His research has been supported by AFOSR, NSF, NIH, ARO, ONR, State of Maryland, and private foundations. Throughout his career, Sung Hoon has co-authored 55 papers, has given over 150 presentations (including >85 invited talks), and has six patents and five pending patents. His honors include 2022 Hanwha Non-Tenured Faculty Award, 2021, 2020 Air Force Summer Faculty Fellowship, 2020 Johns Hopkins University Catalyst Award, 2019 Johns Hopkins University Whiting School of Engineering Research Lab Excellence Award, Invitee for 2019 China-America Frontiers of Engineering Symposium, FY 2018 Air Force Office of Scientific Research Young Investigator Program Award, Invitee for 2016 National Academy of Engineering US Frontiers of Engineering Symposium, and 2011 Materials Research Society Graduate Students Gold Award. He served as an editorial board member of Scientific Reports and a guest editor of Materials Research Society Bulletin. Currently, he serves as an editorial board member of Multifunctional Materials and Sensors, respectively. He has been co-organizing ~35 symposia on bioinspired materials, 3D printing, and mechanical metamaterials at international conferences. He is a member of Materials Research Society (MRS), American Society of Mechanical Engineers (ASME), American Physical Society (APS), and Society of Engineering Science (SES). He served as the Chair, Vice Chair, Secretary, and Editor of ASME Technical Committee on Mechanics of Soft Materials.)
| Date | Tuesday, June 21st, 2022
| Time | 15:00 ~
| Venue | 33동 223호 (동부 세미나실)
[Abstract]
Adaptability is one of the hallmarks of living organisms that provide resilience to survive and flourish in dynamically changing environment. I will present our ongoing efforts about how we can realize materials that can adapt to their mechanical loading environments by adjusting their mechanical properties autonomously.
I will present self-adaptive materials that can change their mechanical properties depending on loading conditions. Nature produces outstanding materials for structural applications such as bones and woods that can adapt to their surrounding environment. For instance, bone regulates mineral quantity proportional to the amount of stress. It becomes stronger in locations subjected to higher mechanical loads. This leads to the formation of mechanically efficient structures for optimal biomechanical and energy-efficient performance. However, it has been a challenge for synthetic materials to change and adapt their structures and properties to address the changes in loading conditions.
To address the challenge, we are inspired by the findings that bones are formed by the mineralization of ions from blood onto scaffolds. I will present a material system that triggers mineral deposition from ionic solutions on polymeric scaffolds upon mechanical loadings so that it can self-adapt to mechanical loadings. For example, the mineralization rate could be modulated by controlling the loading condition and a 30-180% increase in the modulus of the material was observed upon cyclic loadings whose range and rate of the property change could be modulated by varying the loading condition. Our preliminary results showed that the material system showed a decrease in crack propagation speed by ~90%, resulting in significantly improved fatigue lifetime from its damage mitigation mechanism. Furthermore, we realized liquid-infused porous piezo materials that could work in a non-liquid environment, which showed increase in both modulus and dissipation with cyclic loadings. We envision that our findings open new strategies for making synthetic materials with self-adaptable mechanical properties.
| Host | 선정윤 교수 (02-880-1714)