세미나안내

[2017 11 21] 특별세미나 _Prof. Sung Hoon Kang (Johns Hopkins Univ.)

Harnessing behaviors of polymer composites for ultrasensitive low-cost sensors and bone-inspired materials with self-regulating mechanical properties

관리자 | 2017.11.20 09:06 | 조회 293


Harnessing behaviors of polymer composites for ultrasensitive low-cost sensors and

bone-inspired materials with self-regulating mechanical properties

 

 Date: 2017. 11. 21(Tue) , 16:00 ~ 18:00

 Place: Science Building, Room.202 Multimedia Room

 Speaker: Prof. Sung Hoon Kang (Johns Hopkins Univ.)

Host of a Seminar: Prof. Unyong Jeong

Abstract:

 

In my presentation, I will first introduce a number of my current research topics based on stimuli-responsive materials and structures and 3D printing then focus on two studies about how we can harness behaviors of polymeric composites with potential applications in sensing, healthcare and, protection.

Highly sensitive flexible pressure sensors are subjects of growing interest for various applications including wearable devices and internet of things. Current technologies on piezoresistive sensors rely on costly materials and fabrication methods such as graphene-based and micro-structured composites limiting accessibility and scalability. Here we report a facile process to fabricate ultra-sensitive piezoresistive flexible pressure sensors by introducing mesoscale pores within low-cost polydimethylsiloxane matrix/multi-wall carbon nanotubes composites. We show ultra-high sensitivity with a strain gauge factor over 300 with a fraction of cost compared with the current high performance materials. We also demonstrate the application of the sensors by capturing gentle pressures (1 Pa~100 Pa) such as water droplet, 1-gram weight loading, cockroach footsteps and finger tapping. Due to its outstanding performance and the low cost, our composite sensor can contribute to expanding the scope of applications of electronic skins, interactive human-machine interface systems and internet of things.

Nature produces outstanding materials for structural applications such as bones and wood 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 the higher mechanical loads. This leads to the formation of mechanically efficient structures for optimal biomechanical and energy-efficient performance. However, it is a challenge for synthetic materials to change and adapt their structures and properties to address the changes of loading conditions. To address the challenge, we are inspired by the findings that bones are formed by mineralization of ions from blood onto scaffolds. We report a material system that triggers mineral synthesis from ionic solutions on organic scaffolds upon mechanical loadings and/or damages so that it can self-adapt to mechanical loadings and regenerate upon damages. For example, we observed ~30% increase in the modulus of the material upon periodic loadings for 3 days. We also observed that the material could self-repair damages generated by removing ~5 μm thick minerals from the matrix, in 7 days. We envision that our findings can open new strategies for making synthetic materials with self-adaptability and self-repair capability.

 

[Bio]

Sung Hoon Kang is an Assistant Professor in the Department of Mechanical Engineering and Hopkins Extreme Materials Institute at Johns Hopkins University since January 2015. 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 bioinspired solutions to address current challenge in materials and mechanical systems with applications including safety, healthcare, and energy. Throughout his career, Sung Hoon has co-authored 32 peer-reviewed papers, has given over 55 presentations, and has one patent and three pending patents. His honors include FY 2018 Air Force Office of Scientific Research Young Investigator Program Award, 2016 National Academy of Engineerings US Frontiers of Engineering Symposium Invitee, and 2011 Materials Research Society Graduate Students Gold Award. He served as an editorial board member of Scientific Reports (Nov. 2014 Oct. 2017) and a guest editor of February 2016 issue of Materials Research Society Bulletin. Currently, he serves as a reviewer for a number of journals including Science, Advanced Materials, ACS Materials & Interfaces, Nanoscale, Soft Matter, Applied Physics Letters, Composites Part A, Smart Materials and Structures, Bioinspiration & Biomimetics, Advanced Materials Technologies, and Science Advances. He is a member of Materials Research Society (MRS), American Society of Mechanical Engineers (ASME), Society of Engineering Science (SES), and American Physical Society (APS).

 

Dept. of MSE / BK21+



 



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