2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Simulation of ac-electroosmotic flows for concentration of particles on biosensors

L. Tanguy, G. Casalis and L. Nicu

electroosmostic flows, spectral collocation, biosensor, particle concentration

Artificial concentration of particles in a fluid is a major challenge for micro- and nanobiosensors to enhance sensitivity and to reduce the time of response. We present here a numerical simulation of electroosmotic flows for particles concentration dedicated to biosensors. First a theoretical description of the electric potential in the fluid is presented, and the equation is numerically solved by spectral collocation. The result is used to obtain a slipping flow velocity condition above the electrodes and also the dielectrophoretic forces. Then Navier-Stokes equations are solved with this boundary condition using the same numerical method. Typical vortices are obtained through simulation and their aspects can be modified through electrical and geometrical parameters to enhance the concentration patterns. Either planar or cylindrical symmetries can be simulated through this method. Finally forces acting on particles are evaluated to obtain a better understanding of the particles trajectory. Improvement of the numerical method and comparisons to experimental data are currently under investigations.

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