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Physics Colloquium, January 29, 2002Entropically driven self-assembly and interaction in suspensionArjun G. YodhDepartment of Physics & Astronomy, University of PennsylvaniaThe addition of small macromolecules (particles) to a suspension of large particles causes an entropic attraction to arise between the large particles. The origin of this attractive force is an increase in volume (i.e. entropy) available to the smaller particles that arises when the large particles are moved close together. We review this effect and experimentally explore its manifestations near walls, wall-structures, within vesicles, and in suspensions of polymeric DNA. Light force microscopies to measure colloidal particle interactions are introduced and experimentally demonstrated in some of these systems. Finally, entropically driven nucleation and assembly on grating surface templates is demonstrated. 3.30 p.m., Smith Laboratory, Room 1005Refreshments served in Smith 1094 at 3:00 p.m. |
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