简介: |
报告摘要：
Cooperative mechanics in two different processes have remotely similar roots but play out in very different ways. Self-fracturing of solids, caused by chemical- or phase-transformation, results in an intricate crack-network, whose morphology and speed of propagation could be calculated analytically [1], and was later verified by extensive computer simulations. It is also observed in many natural processes and solid-state reactions. For a remotely similar process of concurrent growth of graphene or other material seeds, analysis and simulations show entirely different selection [2], gradually promoting one grain direction over all others and resulting in successful synthesis of 2D-monocrystal [3].
References
[1] Yakobson, Phys Rev Lett, 67, 1590; A. Malthe-Sørenssen et al. Phys Rev Lett, 96, 245501.
[2] N. Gupta, K. Bets, and Yakobson, in progress.
[3] I. Vlassiouk, et al., Nat Mater, 17, 318; D. Passerone, Nat Mater, 17, 296.
报告人简历：
Boris I. Yakobson is an expert in theory and computational modeling of materials nanostructures, of their synthesis, mechanics, defects and relaxation, transport and electronics. Presently, Karl F. Hasselmann Endowed Chair in Engineering, professor of Materials Science and Nano-Engineering, and professor of Chemistry, Rice University, Houston, Texas. Received PhD 1982 in Physics and Applied Mathematics, from Russian Academy of Sciences. 1982-1989, Head of Theoretical Chemistry lab at the Institute of Solid Materials of the Russian Academy. 1990-1999, on the faculty of the Department of Physics, North Carolina State University. His research, sponsored over the years by the National Science Foundation, Department of Energy, NASA, Department of Defense, Army Research Office, Air Force Research Laboratory and AFOSR, Office of Naval Research, as well as private industry and foundations, resulted in over 400 publications and eight patents. Received Department of Energy Hydrogen Program Award, Nano 50 Innovator Award from Nanotech Briefs (Boston), Royal Society (London) Professorship Award, Department of Energy R & D Award, NASA Faculty Award. Yakobson has mentored a number of PhD students and postdoctoral associates, serves on the editorial boards of several journals and on steering committees. |
