Dynamics of a microchain of superparamagnetic beads in an oscillating field

Li, Yan Hom; Chen, Ching‐Yao; Sheu, Shih Tsung; Pai, Jay Min

doi:10.1007/s10404-012-0974-y

Cited by 19 publications

(11 citation statements)

References 19 publications

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“…In most cases, an antisymmetric S shape configuration is formed as shown in Figure b . In another context, it has also been depicted that chained paramagnetic colloids experience structural instabilities in the presence of oscillating magnetic fields …”

Section: Magnetic Torque Of Colloids and Suspensionsmentioning

confidence: 90%

Actuating Soft Matter with Magnetic Torque

Erb

Martin

Soheilian

et al. 2016

Adv Funct Materials

226

200

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Here, recent significant developments are reviewed in manipulating soft matter systems through the use of magnetic torque. Magnetic torque enables the orientation, assembly, and manipulation of thermally fluctuating systems in broad material fields including biomaterials, ceramic and composite precursor suspensions, polymer solutions, fluids, foams, and gels. Magnetism offers an effective, safe, and massively parallel manufacturing approach. By exploiting magnetic torque, leading soft matter researchers have demonstrated new technologies in rheology, life sciences, optics, and structural materials. Specifically, magnetic torque has been used to assemble particle suspensions, to fabricate and actuate composite materials, and to control and manipulate biological materials. In each of these applications, there are energetic limitations to magnetic torque that need to be understood and characterized. However, magnetic torque offers a promising remote‐controlled approach to creating and enabling new soft matter technologies.

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Section: Magnetic Torque Of Colloids and Suspensionsmentioning

confidence: 90%

Actuating Soft Matter with Magnetic Torque

Erb

Martin

Soheilian

et al. 2016

Adv Funct Materials

226

200

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“…This work employs the similar apparatus described in Ref. 5. Former studies experimentally demonstrated the distinct behaviors of microchains under the oscillating field with various controlling parameters, such as the chain's length and field strength.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…Magnetic microbeads chains have recently drawn high attention due to their promising potential microfluidic systems [1][2][3][4][5] and biomedical applications. [6][7][8][9][10][11] Magnetic actuation enables motion of the magnetic micro devises to be controlled wirelessly without affecting biological viability but with the extra benefit that the direction of motion can be determined by the field.…”

Section: Introductionmentioning

confidence: 99%

Flexible mechanism of magnetic microbeads chains in an oscillating field

Yen

2018

AIP Advances

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To investigate the use of magnetic microbeads for swimming at low Reynolds number, the flexible structure of microchains comprising superparamagnetic microbeads under the influence of oscillating magnetic fields is examined experimentally and theoretically. For a ductile chain, each particle has its own phase angle trajectory and phase-lag angle to the overall field. This present study thoroughly discusses the synchronicity of the local phase angle trajectory between each dyad of beads and the external field. The prominently asynchronous trajectories between the central and outer beads significantly dominate the flexible structure of the oscillating chain. In addition, the dimensionless local Mason number (Mnl) is derived as the solo controlling parameter to evaluate the structure of each dyad of beads in a flexible chain. The evolution of the local Mason number within an oscillating period implies the most unstable position locates near the center of the chain around 0.6P<t<0.8P. Moreover, a chain with a certain length in the influence of the oscillating field would behave the most significant deformation and have the most flexible structure.

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“…As to the investigations into the dynamics of the oscillating chains, Li et al 7,[17][18][19] performed systemic experiments to define the distinct behaviors of the microchain subjected to an external field composed of a static directional field and dynamical perpendicular component. Their experimental results suggested that the criterion of structural stability of the oscillating chain can be effectively determined by the value of (N Â Mn 1/2 ), which was confirmed by Lin et al 20 via various experiment conditions with stronger viscous solvent and various diameters of magnetic microbeads.…”

Section: Introductionmentioning

confidence: 99%

Magnetic microchains and microswimmers in an oscillating magnetic field

Ido

Tsutsumi

et al. 2016

Biomicrofluidics

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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.

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Dynamics of a microchain of superparamagnetic beads in an oscillating field

Cited by 19 publications

References 19 publications

Actuating Soft Matter with Magnetic Torque

Actuating Soft Matter with Magnetic Torque

Flexible mechanism of magnetic microbeads chains in an oscillating field

Magnetic microchains and microswimmers in an oscillating magnetic field

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