Dynamic Assembly of Magnetic Nanocolloids

Dobnikar, Jure

doi:10.1016/b978-0-08-102302-0.00002-x

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…On the other hand, magnetic forces and torques have been successfully applied to control soft materials, ranging from individual macromolecules (15)(16)(17) to solid particles (18) and even bulk liquids (19,20). They are also being increasingly used in the context of active matter to energize systems of solid ferromagnetic particles (21,22) and Janus particles (23,24) via, e.g., oscillating magnetic fields (25)(26)(27)(28)(29). In addition to rendering passive particles active, magnetic fields have been, to limited extent, used to control the dynamics of activate particles by, e.g., steering them (26,30).…”

Section: Introductionmentioning

confidence: 99%

Magnetic Quincke rollers with tunable single-particle dynamics and collective states

Reyes Garza,

Kyriakopoulos,

Cenev

et al. 2023

Sci. Adv.

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Electrohydrodynamically driven active particles based on Quincke rotation have quickly become an important model system for emergent collective behavior in nonequilibrium colloidal systems. Like most active particles, Quincke rollers are intrinsically nonmagnetic, preventing the use of magnetic fields to control their complex dynamics on the fly. Here, we report on magnetic Quincke rollers based on silica particles doped with superparamagnetic iron oxide nanoparticles. We show that their magnetic nature enables the application of both externally controllable forces and torques at high spatial and temporal precision, leading to several versatile control mechanisms for their single-particle dynamics and collective states. These include tunable interparticle interactions, potential energy landscapes, and advanced programmable and teleoperated behaviors, allowing us to discover and probe active chaining, anisotropic active sedimentation-diffusion equilibria, and collective states in various geometries and dimensionalities.

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Section: Introductionmentioning

confidence: 99%

Magnetic Quincke rollers with tunable single-particle dynamics and collective states

Reyes Garza,

Kyriakopoulos,

Cenev

et al. 2023

Sci. Adv.

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“…Active particles are self-propelled units which are powered by the energy stored in the environment or provided by external fields. There are two major classes of active systems: biological agents (from microorganisms and insects to animals and people) − and synthetic agents (ranging from self-propelled microparticles to robots and vehicles). − While mechanisms of self-propulsion may be intrinsically different, many systems show common features: transition to collective motion with the increase in concentration manifested by an emergence of large-scale flows, vortices, and coherent dynamics structures. , …”

Section: Introductionmentioning

confidence: 99%

Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers

2019

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Active magnetic colloids are capable of rich collective behavior and complex self-organization. The interplay between short-and long-range interactions taking place away from equilibrium often results in a spontaneous formation of localized dynamic microstructures. Here we report a method for guided self-assembly and control of self-organized colloidal vortices emerging in a ferromagnetic particle ensemble energized by a uniaxial alternating (ac) magnetic field. The structure of a vortex composed of rolling magnetic particles can be stabilized and manipulated by means of an additional strongly localized alternating magnetic field provided by a minicoil. By tuning the parameters of the localized field, we effectively control the dimensions and particle number density in the vortex. We find that the roller vortex self-organization is assisted by field-induced magnetic "steering" rather than magnetic field gradients and is only possible while the system is in the active (magnetic rollers) state. We demonstrate that parameters of the emergent vortex are efficiently tuned by a phase shift between alternating magnetic fields. The method for assisted self-organization of rolling magnetic colloids into a vortex with ondemand characteristics suggests a new tool for active matter control and manipulation that may lead to a development of new approaches toward the guided microscopic transport in active particle systems.

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Dynamic Assembly of Magnetic Nanocolloids

Cited by 2 publications

References 32 publications

Magnetic Quincke rollers with tunable single-particle dynamics and collective states

Magnetic Quincke rollers with tunable single-particle dynamics and collective states

Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers

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