Depinning dynamics of two-dimensional magnetized colloids on a substrate with periodic pinning centers

Cao, Yigang; Zhang, Z.F.; Zhao, Minghao; Fu, Gui; Ouyang, D.

doi:10.1016/j.physa.2012.01.020

Cited by 8 publications

(12 citation statements)

References 33 publications

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“…A realistic quenched substrate is considered and we simulate the disorder with = N 400 p point-like pinning centers which are randomly distributed in the substrate. The motion of colloidal particles is described by the Langevin equation [26,28,42,43,[46][47][48] å å…”

Section: Modelmentioning

confidence: 99%

“…where h is the viscosity coefficient, R i and r j are the positions of the ith colloid and the jth pinning center, respectively, U cc is the interaction potential between colloidal particles, U cp is the interaction potential between colloidal particles and pinning centers in the substrate, F d is the external driving force, and F i T is the thermal stochastic force, which satisfies [26,28,42,43,[46][47][48]…”

Section: Modelmentioning

confidence: 99%

“…While most of studies of colloids have been devoted to the equilibrium properties [22][23][24], recent attention has been aroused to the non-equilibrium behaviors, particularly the responses to an external field [25][26][27][28][29]. Using an external field, we can control and track the motion of colloidal particles, and thereby probing the microscopic rheological properties and viscous elastic responses of the biological cells.…”

Section: Introductionmentioning

confidence: 99%

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Living islands of driven two-dimensional magnetic colloids on the disordered substrate

Cao

et al. 2017

J. Phys. Commun.

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We investigate, by Langevin simulations, the depinning of driven two-dimensional magnetic colloids on a substrate with randomly distributed pinning centers. The magnetic colloids are modeled as particles interacting with each other through repulsive magnetic dipole and attractive Lennard-Jones potentials. We find living islands above the depinning when the attraction between colloidal particles dominates. The critical pinning force increases and the living islands disperse gradually with an increasing strength of the pinning centers. But with an increasing strength of the repulsion between colloidal particles, the critical pinning force increases first and then decreases, and the living islands appearing at the low repulsion strength disappear when the repulsion strength is increased above certain value at which the peak effect takes place. When the repulsion strength is further increased, moving smectic and moving crystal structures arise above the depinning where the repulsion between colloidal particles dominates. On increasing the attraction strength, we find that the critical pinning force, which remains unchanged basically at the low attraction strength, decreases and the living islands form gradually in the plastic flows. When the attraction strength is increased to be large enough, the critical pinning force becomes unchanged again and the living islands and phase separation between different islands occur manifestly. The thermal fluctuations at low temperatures compete with the pinning potential, conducive to the formation of living islands, but they smooth the pinning potential at high temperatures, leading to the rapid decrease in the critical pinning force and the dispersion of the living islands.

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Section: Modelmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Living islands of driven two-dimensional magnetic colloids on the disordered substrate

Cao

et al. 2017

J. Phys. Commun.

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“…The Langevin random fluctuating force acting on the ith colloidal particle f L i is described by Refs. [16,[23][24][25] …”

Section: Modelmentioning

confidence: 99%

“…We have studied systematically the dc-force driven dynamics of 2D magnetized colloids on the disordered [23,24] and periodic [25,26] pinning substrates. An elastic smectic motion between the elastic crystal motion and the plastic flow was observed above the depinning.…”

Section: Introductionmentioning

confidence: 99%

Interference mode-locking of 2D magnetized colloids driven by dc and ac forces in periodic pinning arrays

Song¹,

Wang²,

Ren³

et al. 2015

Physica A: Statistical Mechanics and its Applications

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Depinning dynamics of repulsively interacting particle systems with different force ranges

Cao

Yang

et al. 2023

Indian J Phys

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Depinning dynamics of two-dimensional magnetized colloids on a substrate with periodic pinning centers

Cited by 8 publications

References 33 publications

Living islands of driven two-dimensional magnetic colloids on the disordered substrate

Living islands of driven two-dimensional magnetic colloids on the disordered substrate

Interference mode-locking of 2D magnetized colloids driven by dc and ac forces in periodic pinning arrays

Depinning dynamics of repulsively interacting particle systems with different force ranges

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