Grande conférence iLM

Tuesday 13 September 2011 à 14h00.

From carbynes and nanotubes to grahEnes, graphAnes, and sp2-nanofoams

Boris I. YAKOBSON




présentera en 1 heure :

''I will review my group progress in theory of low-dimensional carbon, carbon-BN, and pure boron nanostructures. For carbon, it begins with 1D carbynes …=C=C=C=… [1] and more popular nanotubes [2], and then continues to 2D graphEne, including its functionalized forms of graphAne [3] family (CH, CF, and graphene oxide GO). Naturally, the 2D-carbons may contain the lower-dimensional entities of particular interest, such as edges [4] and the interface grain-boundaries [5-6], which display their own remarkable behaviors. We discovered a connection between the chiral-control in growth of nanotubes [4, 7-8] and relation with graphene edge energy. Theory emerges for the morphological rules for “white-graphene” h-BN and its hybrids with graphene. A class of 3D-foams is also of great interest as a media for energy storage [1, 9], if form of H for the fuel cells or Li+ for batteries. [1] Sorokin, Lee, Singh, BIY, Nano Lett. 11, 2660–2665 (2011). [2] B.I. Yakobson and R.E. Smalley, American Scientist 85, 324 (1997), cover. [3] A.K. Singh, et al., ACS Nano, 4 (2010) 3510, cover. M. Ribas, et al., Nano Res. 4 (2011) 143. [4] Y. Liu, et al., Phys. Rev. Lett. 105 (2010) 235502. [5] Y. Liu and BIY, Nano Lett. 10 (2010) 2178. [6] Ajayan and BIY, Nature Mater., 10, 415-417 (2011). [7] F. Ding et al., Proc. Nat. Acad. Sci. 106 (2009) 2506, cover. [8] J. Gao et al., JACS 133 (2011) 5009. [9] A.K. Singh, et al. J. Phys. Chem. C 115 (2011) 2476, cover. Boris I. Yakobson is a leading expert in theory and computational modeling of materials nanostructures, their synthesis, mechanics, defects and relaxation, transport and electronics. Presently, Karl F. Hasselmann Chair in Engineering, professor of Mechanical Engineering and Materials Science, and professor of Chemistry, Rice University, Houston, Texas. PhD, 1982, from Russian Academy of Sciences. 1982-1989, Head of Theoretical Chemistry group 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 160 publications and six 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, and serves on the editorial boards of several journals and steering committees. .''