= 아 래 =
1. 일 시 : 2014. 5. 14 (수), 16:00 ~
2. 장 소 : 신소재공학과 1317호 강의실
3. 연 사 : 김윤섭 (Univ. of Michigan, Ph.D. candidate)
4. 제 목 : Solid-State Self-Assembly: Fundamentals and Applications
Nanoscale science and technologies has been developed tremendously during the last two decades, introducing a variety of nanomaterials with unique properties. However, incorporation of the properties into macroscale functional applications has been limited. An essential challenge is the integration of such unique properties into assemblies for micro- and macroscale devices and discovering appropriate conditions under which this can be accomplished. Here we explore the self-assembly of nanoparticles (NPs) in solid-state for discovering fundamental understandings of mechanisms and dynamics for various engineering applications. 1. Yoonseob Kim et al. Nature, 2013, 500, 59-63 first demonstrated an example of excellent stretchable conductors from self-assembly of spherical nanoparticles (NPs) in solid-state. Free-standing stretchable conductors were assembled by layer-by-layer assembly. High conductivity and stretchability were observed and the properties originated from dynamic self-organization of NPs under stress. Modified percolation theory to incorporate the self-assembly of NPs gave excellent match with experimental data. 2. The current study demonstrated the chiroptical activities of NPs in solid-state for the applications of biosensing devices and optoelectronics. Unconventional transfer of macroscale stresses shaped nanoscale assemblies with handedness. Chiroptical responses were reversibly tunable by controlled stresses. Computational simulation supported the chiroptical properties originated from self-assembly of NPs in solid-state.