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Reversionary rotation of actuated particles for microfluidic near-surface mixing

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Author: Derks, R.J.S. · Frijns, A.J.H. · Prins, M.W.J. · Dietzel, A.H.
Source:Applied Physics Letters, 2, 99
Identifier: 461443
doi: doi:10.1063/1.3610564
Article number: No.: 024103
Keywords: Channel wall · Fluidic channels · Gravitational forces · Macro scale · Micro-particles · Mixing performance · Motion of particles · Near-surface · Off-axis · Superparamagnetics · Microfluidics · Superparamagnetism · Rotation · Industrial Innovation · Mechatronics, Mechanics & Materials · HOL - Holst · TS - Technical Sciences


The off-axis motion of particles actuated by axial magnetic or gravitational forces is studied in fluidic channels. Single actuated superparamagnetic micro-particles starting from channel walls travel towards the channel center and show unforeseen reversionary rotation phenomena. Different stages of co- and counter-rotation are observed in both micro- and macro-scale experiments and are analyzed by means of numerical fluid-dynamics models. The related microfluidic near-surface mixing performance of the rotating actuated particles is discussed. © 2011 American Institute of Physics.