A theoretical analysis of the resolution due to diffusion and size-dispersion of particles in deterministic lateral displacement devices

Details A theoretical analysis of the resolution due to diffusion and size-dispersion of particles in deterministic lateral displacement devices A theoretical analysis of the resolution due to diffusion and size-dispersion of particles in deterministic lateral displacement devices

2007-11-02

arxiv.org/abs/0711.0347v1

J. Micromech. Microeng. 18, 075030 (2008)

Physics

Fluid Dynamics

5 pages, 3 eps figures, revtex4

Scientific paper

10.1088/0960-1317/18/7/075030

We present a model including diffusion and particle-size dispersion for separation of particles in deterministic lateral displacement devices also known as bumper arrays. We determine the upper critical diameter for diffusion-dominated motion and the lower critical diameter for pure convection-induced displacement. Our model explains the systematic deviation, observed for small particles in several experiments, from the critical diameter for separation given by simple laminar flow considerations.

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