Putting hydrodynamic interactions to work: tagged particle separation

Details Putting hydrodynamic interactions to work: tagged particle separation Putting hydrodynamic interactions to work: tagged particle separation

2002-11-12

arxiv.org/abs/cond-mat/0211243v2

Physics

Condensed Matter

Soft Condensed Matter

Version accepted for publication - Europhysics Letters

Scientific paper

10.1209/epl/i2003-00572-5

Separation of magnetically tagged cells is performed by attaching markers to a subset of cells in suspension and applying fields to pull from them in a variety of ways. The magnetic force is proportional to the field gradient, and the hydrodynamic interactions play only a passive, adverse role. Here we propose using a homogeneous rotating magnetic field only to make tagged particles rotate, and then performing the actual separation by means of hydrodynamic interactions, which thus play an active role. The method, which we explore here theoretically and by means of numerical simulations, lends itself naturally to sorting on large scales.

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