When 3:30 PM - 5:00 PM May 09, 2011
Where 1670 CSE Building
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2011 Van Vlack Lecture Series - Phases and Defects in Dense Colloidal Structures


Frans A. Spaepen, Harvard School of Engineering and Applied Sciences

Colloidal particles in suspension form liquid, crystalline and glassy phases similar to those formed by atoms. The structure of the phase that is formed depends on the nature of the colloids and their interactions (hard sphere, charged, functionalization of the surfaces, monodisperse or alloy) and especially the density. Since the particles have diameters on the order of a micron they can be observed by optical microscopy. In particular, confocal microscopy has made it possible to track the individual particles in time and space and to use colloidal systems as "analog computers" for the study of the dynamics of defects in crystals (stacking faults, dislocations, grain boundaries) and the fundamental mechanisms of the deformation of simple glasses.

 

The Van Vlack Lecture Series was established in honor of L. H. Van Vlack, to provide a distinguished lecture series from the outstanding leaders in the field of Materials Science and Engineering