Prof. K. Jimmy Hsia Departments of Mechanical Engineering & Biomedical Engineering Carnegie Mellon University, Pittsburgh, USA

Self-Assembled 3D Shape Formation Induced by Chemical Stimuli
When Sep 07, 2016
from 10:00 AM to 11:00 AM
Where LR7
Contact Name
Contact Phone 01865-283302
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Self-assembly processes, often driven by mechanical interactions between different parts in a material, can lead to formation of tubes, 3D structures, or devices with unique properties. The stimuli for these self-assembly processes can be thermal, chemical, or even by living cells or through intrinsic material properties such as lattice parameter differences. Here I present a few case studies of how chemical stimuli can be used to control shape formation of soft materials. The first case demonstrates mismatch strain-driven curvilinear shape formation by folding of polymer films induced by differential swelling upon chemical stimulation. Experiments with combined top-down and bottom-up approach demonstrate capabilities to form various curvilinear shapes. Finite element modeling of these systems is used to guide the shape formation processes, leading potentially to origami folding. Another case involves controlling the polymerization of a gel in a confined configuration leading to buckled 3D configurations. Such polymerization (growth) induced 3D shape may be used to study complex shape formation processes of biological systems such as organs of complex shapes. Based on the mechanics understanding of these mechanical mechanisms, one can design different 3D shapes including origami.

kjhsia@cmu.edu

Biography:

K Jimmy Hsia

K. Jimmy Hsia is Vice Provost for International Programs and Strategy, and Professor of Mechanical Engineering and Biomedical Engineering at Carnegie Mellon University. He received his B.S. from Tsinghua University, Beijing, China, and his Ph.D. from MIT. His research interests include deformation and failure mechanisms of materials, mciro/nanomechanics of nanoscale materials, and cell mechanics. He is a Fellow of American Association for the Advancement of Science (AAAS), a Fellow of American Society of Mechanical Engineers (ASME), and recipient of NSF Research Initiation Award, Max-Planck Society Scholarship, Japan Society for Promotion of Science Fellowship. Before joining CMU in 2015, he was W. Grafton and Lillian B. Wilkins Professor of Mechanical Science and Engineering at the University of Illinois at Urbana-Champaign (UIUC). From 2005-2007, Hsia served as Founding Director of Nano and Bio Mechanics Program in the Directorate for Engineering at NSF. He served as Associate Dean of Graduate College and Associate Vice Chancellor for Research for New Initiatives at UIUC. He is a co-Editor-in-Chief of a newly launched Elsevier journal, Extreme Mechanics Letters, whose announcement on iMechanica attracted more 10,000 hits within a week.