Fwd: FW: Seminar Search for New Multi-functional Materials with Ruga Mechanics of Nanostructures - 27 Nov 2013 (Wednesday) at 10.30 am
Wei-Lin Tan
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IHPC Computational Science and Engineering Seminar | |
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Seminar Title: |
Search for New Multi-functional Materials with Ruga Mechanics of Nanostructures |
Speaker: |
Professor Kyung-Suk Kim |
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Date&Time: | 27 Nov 2013 (Wednesday) at 10.30 am |
Venue |
IHPC, North Tower, Connexis, Level 16 Training Room |
Host in IHPC: |
Dr. Reddy Chilla Damodara |
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Abstract: | Over the past decade nano science and technology has enabled us to explore new functional properties of hierarchically ruga-structured materials through folding or wrapping thin surface layer structures with nanometer scale features. The Latin word ruga means a state of a “large-amplitude” wrinkle, crease, fold or ridge to form various 1-D or 2-D patterns. As multi-scale surface morphologies of rugae determine effective properties such as wetting, adhesion, friction, flexoelectric and optoelectronic properties, ruga state control is considered as a viable method for real-time regulation of effective material properties. It is found that graded or layered elastic properties of the substrate can provide diverse bifurcation paths of surface deformation under lateral compression, producing various surface ruga states. In the first half of the talk I will introduce mathematical analysis of sequential bifurcation processes in surface deformation of a neo-Hookean substrate with its elastic modulus exponentially decaying along the depth from its free surface.
In turn, iso-periodic-compression Ruga Phase Diagram of neo-Hookean solids with their moduli exponentially decaying with depth has been constructed, and its implications on engineering multi-scale ruga structures are presented. In the second half of the talk, a new invention of dual-tip AFM interferometer (DT-AFMI) will be introduced. Then, it will be shown how the DT-AFMI is used to discover a static shock (strain discontinuity) in graphene, i.e. a crinkle ridge (a nano-ruga !). The static shock has its transition thickness of only 1.8nm. The crinkle ridge networks on graphite surfaces exhibit high protein adsorptivity; implications of the high protein adsorptivity on the function of an artificial graphite heart valve will be discussed as an application example. |
Biography: |
Professor Kim has been working as an engineering scientist, as an inventor, and as an educator to contribute to the rapidly evolving society. His research interest is in an interdisciplinary area, solid mechanics of small scale material structures; nano and micromechanics of solids in both experiment and theoretical modeling.
For his research he has invented numerous new scientific instruments and analytical methods, and he has recently initiated “ruga mechanics” as a new thrust in applied mechanics research. For teaching, he has developed a number of innovative laboratory course materials, including “Bow and arrow dynamics”, “Wheel and suspension dynamics” and “Violin and bell dynamics” laboratory course materials. So far, he has advised 26 PhD students and Post Docs who are currently in academia or industries. For public service, he is currently a board member of the Society of Engineering Science.
Professional Preparation: Seoul National University, S. Korea - Mechanical Engineering - B.S. 1974. Seoul National University, S. Korea - Mechanical Engineering - M.S. 1976. Brown University, Providence, RI - Solid Mechanics - Ph.D. 1980. California Institute of Technology, Pasadena, CA -Aeronautics - 1979-1980 (Post-doctoral).
Appointments : • Professor, Solid Mechanics, School of Engineering, Brown University, 1989 – present. • Simpson Visiting Fellow of Applied Mechanics, Northwestern University, 2013 • Distinguished Visiting Scientist, Korea Institute of Science and Technology, 2008 • Visiting Scholar, Harvard University, 1987-1988 and 2002 • Visiting Scientist, University of California, Santa Barbara,1997 • Visiting Scholar, Cambridge University, UK, 1996 • Associate Professor, Theoretical and Applied Mechanics, University of Illinois Urbana-Champaign, 1986-1989. • Assistant Professor, Theoretical and Applied Mechanics, University of Illinois Urbana-Champaign, 1980 - 1986.
Honors and Awards : • Engineering Science Medal, The Society of Engineering Science, 2012 • Kwan-Ak Dae-Sang (Distinguished Alumni Award) of Seoul National University,2012 • Ho-Am Laureate in Engineering, Samsung Foundation, 2005 • Best JEP Paper Award (with A. Bastawros), ASME, 1999 • John Simon Guggenheim Fellow, John Simon Guggenheim Memorial Foundation, 1996 • Melville Medal (with R.J. Clifton), ASME, 1981 |
Institute of High Performance Computing | |
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