16 mars 2007 de 16 h 00 à 18 h 00 (heure de Montréal/HNE) Sur place
Colloque par Michael Brenner (Harvard University)
Self assembly refers to the dream of being able to mix small components in a jar and have them spontaneously assemble into a functional device. The primary obstacle with making this work in practice is that in general a set of N interacting objects have a large number of metastable states, which grows rapidly (exponentially) with N. In principle this can be dealt with by either designing the energy function so that there is only a unique equilibrium state or by tuning the dynamics so that the desired equilibrium is accessed from a specified initial conditions. Both of these methods require a close interplay between mathematics and experimentation. This talk will summarize opportunities in this field, and also discuss two examples of our recent research in this direction: First we discuss a method for assembling uniquely specified packings of spheres where the non-uniqueness problem does not exist; secondly we discuss recent efforts to discover whether and how interaction specificity between spheres can lead to selection of desired structures, avoiding the nonuniqueness problem.
AdresseUQAM, Pav. Sherbrooke, 200, rue Sherbrooke O., salle SH-3420