Live 3D Modeling with Colloids
Event details
Date | 23.10.2017 |
Hour | 13:15 › 14:15 |
Speaker | Prof. Frans Spaepen, School of Engineering and Applied Sciences Harvard University, Cambridge |
Location | |
Category | Conferences - Seminars |
Colloidal particles in suspension form liquid, crystalline and glassy phases similar to those formed by atoms. Since the particles are “fat” (~1µm) and “slow” (~10Hz), they can be individually tracked in space and time by confocal microscopy. Dense colloidal systems therefore serve as "analog computers" to study the dynamics of defects in crystals (vacancies, stacking faults, dislocations, grain boundaries), crystal nucleation, crystal-liquid interfaces, and the fundamental mechanisms of the deformation of glasses.
References:
K.E. Jensen, D.A.Weitz and F. Spaepen, "Local shear transformations in deformed and quiescent hard- sphere colloidal glasses", Physical Review E 90: 042305 (2014).
E. Maire, E. Redston, M. Persson Gulda, D.A. Weitz and F. Spaepen, "Imaging grain boundary grooves in hard-sphere colloidal bi-crystals", Physical Review E94: 042604 (2016).
J. Sprakel, A. Zaccone, F. Spaepen, P. Schall and D.A. Weitz, ''Direct observation of entropic stabilization of bcc crystals near melting'', Physical Review Letters 118: 088003 (2017).
Bio: Frans Spaepen is John C. and Helen F. Franklin Professor of Applied Physics at Harvard University. He got his undergraduate degree, in Metallurgical Engineering, at the K.U. Leuven in 1971, and a Ph.D. in Applied Physics from Harvard University in 1975. He joined the faculty of the Division of Applied Sciences at Harvard in 1977 as Assistant Professor, was appointed Associate Professor in 1981, and Full Professor in 1983. In 1984 and 2007 he was a Visiting Professor at the University of Leuven, and in 2000-01 a Humboldt visitor in Köln and Jülich. From 1990 till 1998 he was Director of the Harvard Materials Research Laboratory/Materials Research Science and Engineering Center. From 2002 to 2013 he was the Director of the Rowland Institute at Harvard. In 2008-09 he was Interim Dean of the School of Engineering and Applied Sciences and in 2009-10, he was Interim Director of Harvard's Center for Nanoscale Systems.
His research interests span a wide range of experimental and theoretical topics in materials science, such as amorphous metals and semiconductors (viscosity, diffusion, mechanical properties), the structure and thermodynamics of interfaces (crystal/melt, amorphous/crystalline semiconductors, grain boundaries), mechanical properties of thin films, the perfection of silicon crystals for metrological applications, and colloidal systems as models for the study of dynamics and defects in crystals and glasses.
He is a Fellow of the American Physical Society (Chairman, Division of Materials Physics, 1992), of the Materials Research Society (Councillor: 1986-89; 1990-93; Chairman, Program Committee, 1993-2000), and of the TMS. He is a member of the National Academy of Engineering, a member of the Vlaamse Academie voor Wetenschappen en Kunsten, an External Member of the Max-Planck Society, and a member of ASM. He was co-editor of Solid State Physics, and an editorial board member of a number of materials science journals.
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Practical information
- General public
- Free
Organizer
- Esther Amstad & Vaso Tileli
Contact
- Esther Amstad & Vaso Tileli