281113 Dissipative Particle Dynamics Simulation of Sonication-Mediated Particle Interactions

Tuesday, October 30, 2012
Hall B (Convention Center )
Shu Li1, Melissa H. Lash1, Steven R. Little2 and Joseph McCarthy1, (1)Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA, (2)Departments of Chemical and Petroleum Engineering, Bioengineering, Immunology, and The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA

Sonication is a powerful dispersion technique that has been used successfully to disperse agglomerates and break partially formed bridges of nano-scaled particles. For micro-scaled particles, recent work in our lab suggests that it may also serve as a viable “thermalization” technique in order to promote close-packed, highly ordered colloidal crystal formation of large (non-Brownian) particles on a surface. In this study, we computationally explore the impact of sonication on particle cluster formation using the Dissipative Particle Dynamics (DPD) technique. DPD is a particle-based (i.e. Lagrangian) simulation technique that captures meso-scopic dynamics of multiphase flows by coarse-graining intermolecular forces. At its most basic, this coarse-graining results in a conservative, dissipative, and random force. Here, the effect of sonication is incorporated into the DPD method as an oscillatory external force with high frequency and low amplitude. By adding the external force from the sonication, we can inspect the microscopic details of the relative importance of the particle interactions as a function of driving parameters (frequency and amplitude) and compare our results to experimental measurements.


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