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Article
Simulation of dielectrophoretic motion of microparticles using a molecular dynamics approach
| Authors: |
Lin, Y., Amberg, G.A. |
| Document Type: |
Article |
| Pubstate: |
Accepted |
| Journal: |
4th International conference Nanochannels, Microchannels and Minichannels |
| Volume: |
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| Year: |
2006 |
AbstractWe model and simulate dielectrophoresis of microscale particles using the finite element method. A soft sphere system molecular dynamics model is presented, which solves a set of equations for the motion of every particle. The model couples most of the significant forces, i.e. the dielectrophoresis (DEP) forces, the particle-particle electrostatic forces, particle-particle interfacial repulsive forces, particle-wall repulsive forces and the hydrodynamic forces in Stokes flow. Since the system of equations is stiff, an implicit scheme is used. To obtain the particle trajectories, a constant time-step is applied. We present some numerical tests computing hydrodynamic force, electrostatic force and DEP force using our model, including simulated trapping of particles in a micro channel by dielectrophoresis. The results are in agreement with the theories and the experimental observations.
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