Abstract
A magnetic chain consisted of micro-sized beads in a rotating magnetic field is experimented to observe its motion synchronicity with the external field. If the field frequency is sufficiently high, reverse motion occurs to slow down the average angular speed, so that the chain rotates much slower than the external field. A square field configuration, in which the instantaneous strength and angular speed vary with time within every rotating period, is proposed to improve the chaining stability and the motion synchronicity while a same overall frequency with the conventionally used circular field configuration is preserved.
Highlights
INTRODUCTIONThe structural instability, i.e., rupture of the chain, should be prevented for rotors or swimmers, while preferred for mixers
AND EXPERIMENTAL METHODSMagneto-microfluidics are subjects of great interest in the past decades because of their potential applications to MEMS
The so-called “trajectory shift,” which results in reverse motion of chains against the external field, was identified when the phase difference exceeds π/2.7 The reverse motion is generally undesired in common applications, but may be applied to steer micro-swimmers
Summary
The structural instability, i.e., rupture of the chain, should be prevented for rotors or swimmers, while preferred for mixers. The so-called “trajectory shift,” which results in reverse motion of chains against the external field, was identified when the phase difference exceeds π/2.7 The reverse motion is generally undesired in common applications, but may be applied to steer micro-swimmers.. The so-called “trajectory shift,” which results in reverse motion of chains against the external field, was identified when the phase difference exceeds π/2.7 The reverse motion is generally undesired in common applications, but may be applied to steer micro-swimmers.8 As a result, both the structural instability and the motion synchronicity are important factors to ensure effective manipulations. Frequencies of the external field and the bead chain, denoted as fH and fB, respectively, are the main measures to be observed and discussed
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