2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

External Field Induced Non-Uniform Growth of Micron Composite Materials in Insulating Liquid: Experimental and Simulating

S. Tada, Y. Shen, Z.Y. Qiu
The City College of New York, US

Keywords:
MD simulation, dielectrophoresis, particle cluster, non-uniform cluster growth

Abstract:
Numerical simulation is performed of motion and cluster formation of particles in a flowing suspension of particles in corn oil through a 60x120x3.0mm chamber with a spatially periodical electrode array. The chamber is rotated to prevent heavy particles from settling. The suspension flows along the electrode and the electric field is assumed to be two-dimensional. The Langevin equation is used to describe Newtonian dynamics of the suspension under combined electric and flow fields. Considered forces on a particle include the non-zero time-average Coulomb interactions with all the other polarized particles, non-zero time-average dielectrophoretic force from gradient AC electric fields, Stokes’ drag force, Brownian force and rotation-dependent gravitation. A fully developed laminar flow is assumed. A periodic boundary condition is applied. ‘Natural minimum unit’ of 7.2x3.6x3.0mm is chosen for simulations. Particles trajectories are calculated from converged electric field. The simulations on our cluster of 64CPUs have reproduced most of our published experimental data about particle motion and clustering under electric field when liquid flows or does not, and also provide more details about interactions of electrostatics and hydrodynamics and their effects on clustering. This is the first report to simulate the transient of cluster growth in electrically and hydrodynamically non-uniform environments.


Nanotech 2008 Conference Program Abstract