Abstract
The motion of monodisperse particle ensembles in fluidic channels actuated by axial magnetic or gravitation forces is studied. Interactions between particles, fluid, and nearby walls induce unforeseen self-organization phenomena. Superparamagnetic microparticles aligned on a channel axis successively organize toward a stable polytwin system under constant force conditions. In the absence of repelling particle interactions, full contact twinning is observed for particles driven by gravity. The mechanisms of successive twinning and spacing regulation are explained by a one-dimensional model based on the axis flow profile. Related performance enhancements for particle based microfluidic pumping are discussed.
| Original language | English |
|---|---|
| Article number | 024104 |
| Pages (from-to) | 024104-1/3 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 92 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2008 |
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