Dynamics of cluster formation in driven magnetic colloids dispersed on a monolayer

Jäger, Sebastian; Stark, Holger; Klapp, Sabine H. L.

doi:10.1088/0953-8984/25/19/195104

Cited by 31 publications

(24 citation statements)

References 46 publications

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“…In systems of rotating particles, such hydrodynamic interactions can indeed induce cluster rotation due to the coupling of translational and rotational motion. 57 The rotating direction of a cluster is the same as that of a single particle. However, the vortices observed in the present work rotates oppositely to the rotating direction of a single swimmer, as illustrated by the "gear" argument.…”

Section: Discussionmentioning

confidence: 99%

Clustering and phase separation of circle swimmers dispersed in a monolayer

Liao

Klapp

2018

Soft Matter

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We perform Brownian dynamics simulations in two dimensions to study the collective behavior of circle swimmers, which are driven by both, an (effective) translational and rotational self-propulsion, and interact via steric repulsion. We find that active rotation generally opposes motility-induced clustering and phase separation, as demonstrated by a narrowing of the coexistence region upon increase of the propulsion angular velocity. Moreover, although the particles are intrinsically assigned to rotate counterclockwise, a novel state of clockwise vortices emerges at an optimal value of the effective propulsion torque. We propose a simple gear-like model to capture the underlying mechanism of the clockwise vortices.

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Section: Discussionmentioning

confidence: 99%

Clustering and phase separation of circle swimmers dispersed in a monolayer

Liao

Klapp

2018

Soft Matter

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“…Dynamics of driven suspensions of ferromagnetically ordered particles has been investigated by means of Brownian dynamics (BD) computer simulations [74,75]. There for the case of a bulk system without a hydrodynamic coupling a full non-equilibrium phase diagram as a function of the driving frequency and field strength has been constructed.…”

Section: Theoretical Aspectsmentioning

confidence: 99%

“…Appearance of the layered states (similar to previously reported in the system of induced dipoles [76]) has been captured in simulations. Implementation of the hydrodynamic interactions in a quasi-two-dimensional setup in a presence of a rotational driving magnetic field allowed to access and study in detail the interplay between permanent dipolar and hydrodynamic interactions [75]. Results indicated a profound effect of the hydrodynamic interactions on the dynamics of structure formation and behavior of the assembled clusters.…”

Section: Theoretical Aspectsmentioning

confidence: 99%

Complex collective dynamics of active torque-driven colloids at interfaces

Snezhko

2016

Current Opinion in Colloid & Interface Science

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Modern self-assembly techniques aiming to produce complex structural order or functional diversity often rely on non-equilibrium conditions in the system.Light, electric or magnetic fields are predominantly used to modify interaction profiles of colloidal particles during self-assembly or induce complex outof-equilibrium dynamic ordering. The energy injection rate, and properties of the environment are important control parameters that influence the outcome of active (dynamic) self-assembly. The current review is focused on a case of collective dynamics and self-assembly of particles with externally driven torques coupled to a liquid or solid interface. The complexity of interactions in such systems is further enriched by strong hydrodynamic coupling between particles.Unconventionally ordered dynamic self-assembled patterns, spontaneous symmetry breaking phenomena, self-propulsion and collective transport have been reported in torque-driven colloids. Some of the features of the complex collective behavior and dynamic pattern formation in those active systems have been successfully captured in simulations.

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“…Ref. [40]) for the case of highly concentrated colloidal suspensions, which are not considered in the present work.…”

Section: Interacting Magnetic Dipolesmentioning

confidence: 99%

Single-file and normal diffusion of magnetic colloids in modulated channels

et al. 2014

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Diffusive properties of interacting magnetic dipoles confined in a parabolic narrow channel and in the presence of a periodic modulated (corrugated) potential along the unconfined direction are studied using Brownian dynamics simulations. We compare our simulation results with the analytical result for the effective diffusion coefficient of a single-particle by Festa and d'Agliano [Physica A 90, 229 (1978)] and show the importance of inter-particle interaction on the diffusion process. We present results for the diffusion of magnetic dipoles as a function of linear density, strength of the periodic modulation and commensurability factor.

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Dynamics of cluster formation in driven magnetic colloids dispersed on a monolayer

Cited by 31 publications

References 46 publications

Clustering and phase separation of circle swimmers dispersed in a monolayer

Clustering and phase separation of circle swimmers dispersed in a monolayer

Complex collective dynamics of active torque-driven colloids at interfaces

Single-file and normal diffusion of magnetic colloids in modulated channels

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