Browsing by Author "Ido, Yasushi"

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Magnetic microchains and microswimmers in an oscillating magnetic field
(2016-01)
Ido, Yasushi
;
Li, Yan-Hom
;
Tsutsumi, Hiroaki
;
Sumiyoshi, Hirotaka
;
Chen, Ching-Yao
Superparamagnetic micro-bead chains and microswimmers under the influence of an oscillating magnetic field are studied experimentally and numerically. The numerical scheme composed of the lattice Boltzmann method, immersed boundary method, and discrete particle method based on the simplified Stokesian dynamics is applied to thoroughly understand the interaction between the micro-bead chain (or swimmer), the oscillating magnetic field, and the hydrodynamics drag. The systematic experiments and simulations demonstrated the behaviors of the microchains and microswimmers as well as the propulsive efficiencies of the swimmers. The effects of key parameters, such as field strengths, frequency, and the lengths of swimmer, are thoroughly analyzed. The numerical results are compared with the experiments and show good qualitative agreements. Our results proposed an efficient method to predict the motions of the reversible magnetic microdevices which may have extremely valuable applications in biotechnology. (C) 2016 AIP Publishing LLC.
Numerical simulations of magnetic microchain behaviors in the presence of magnetic field
(2019-01-01)
Ido, Yasushi
;
Iwamoto, Yuhiro
;
Li, Yan-Hom
;
Chen, Ching-Yao
;
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Behaviors of a magnetic microchain which is an oscillating motion of micrometer-size magnetic particles' cluster caused by an external magnetic field were investigated numerically. The hybrid simulation code which was based on the lattice Boltzmann method, the immersed boundary method and the discrete particle method was developed. The behaviors of a magnetic microchain depends on the number of magnetic particles in the magnetic microchain, frequency of external alternating magnetic field and the strength of applied magnetic field. Three types of behaviors, i.e., rigid rotational oscillation, rotational oscillation with deforming into S shape and splitting into several chains, depends on the number of magnetic particles.