Magnetic Propulsion of Self-Assembled Colloidal Carpets: Efficient Cargo Transport via a Conveyor-Belt Effect

Martínez‐Pedrero, Fernando; Tierno, Pietro

doi:10.1103/physrevapplied.3.051003

Cited by 104 publications

(94 citation statements)

References 42 publications

(44 reference statements)

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“…This strategy does not require lithographic confinement or externally imposed pressure fields, but a suitable actuation scheme that enables net propulsion at low Re number, avoiding reciprocal motion, namely periodic backward and forward body displacements [8]. Recent examples in this direction include the use of magnetically driven nanorods [9], colloidal rotors [10][11][12], or magnetic particles driven above ferromagnetic structures [13][14][15][16]. In contrast to other actuation schemes, for instance the ones based on chemical reactions [17], electric [18], acoustic [19] or optic fields [20], magnetic fields have the advantage of not directly altering the dispersing medium, although they require magnetic parts within the prototypes [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Propulsion and hydrodynamic particle transport of magnetically twisted colloidal ribbons

et al. 2017

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We describe a method to trap, transport and release microscopic particles in a viscous fluid using the hydrodynamic flow field generated by a magnetically propelled colloidal ribbon. The ribbon is composed of ferromagnetic microellipsoids that arrange with their long axis parallel to each other, a configuration that is energetically favorable due to their permanent magnetic moments. We use an external precessing magnetic field to torque the anisotropic particles forming the ribbon, and to induce propulsion of the entire structure due to the hydrodynamic coupling with the close substrate. The propulsion speed of the ribbon can be controlled by varying the driving frequency, or the amplitude of the precessing field. The latter parameter is also used to reduce the average inter particle distance and to induce the twisting of the ribbon due to the increase in the attraction between the rotating ellipsoids. Furthermore, non magnetic particles are attracted or repelled with the hydrodynamic flow field generated by the propelling ribbon. The proposed method may be used in channel free microfluidic applications, where the precise trapping and transport of functionalized particles via non invasive magnetic fields is required.

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Section: Introductionmentioning

confidence: 99%

Propulsion and hydrodynamic particle transport of magnetically twisted colloidal ribbons

et al. 2017

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“…Therefore, we expect that our findings apply equally to a broad class of microswimmers moving in a periodic landscape. Closely related and potentially interesting experiments may use magnetic garnet films [8], critical Casimir forces close to chemically patterned surfaces [66], colloidal carpets [67], or even 'active' (e.g. Pt-coated) surfaces.…”

Section: Discussionmentioning

confidence: 99%

Active colloidal propulsion over a crystalline surface

et al. 2017

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We study both experimentally and theoretically the dynamics of chemically self-propelled Janus colloids moving atop a two-dimensional crystalline surface. The surface is a hexagonally close-packed monolayer of colloidal particles of the same size as the mobile one. The dynamics of the self-propelled colloid reflects the competition between hindered diffusion due to the periodic surface and enhanced diffusion due to active motion. Which contribution dominates depends on the propulsion strength, which can be systematically tuned by changing the concentration of a chemical fuel. The mean-square displacements (MSDs) obtained from the experiment exhibit enhanced diffusion at long lag times. Our experimental data are consistent with a Langevin model for the effectively two-dimensional translational motion of an active Brownian particle in a periodic potential, combining the confining effects of gravity and the crystalline surface with the free rotational diffusion of the colloid. Approximate analytical predictions are made for the MSD describing the crossover from free Brownian motion at short times to active diffusion at long times. The results are in semi-quantitative agreement with numerical results of a refined Langevin model that treats translational and rotational degrees of freedom on the same footing.

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“…As shown in recent works [47,48,52,57,55], collective effects in rotating suspensions near boundaries can be used for guided transport of passive particles. For instance, carpets of microrollers act as an active boundary layer that generates advective flows near boundaries, while fingers and critters can trap and advect particles at large speeds over long distances [57].…”

Section: Perspectivesmentioning

confidence: 98%

Leveraging collective effects in externally driven colloidal suspensions: experiments and simulations

Driscoll

Delmotte

2019

Current Opinion in Colloid & Interface Science

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In this review article, we focus on collective motion in externally driven colloidal suspensions, as well as how these collective effects can be harnessed for use in microfluidic applications. We highlight the leading role of hydrodynamic interactions in the self-assembly, emergent behavior, transport, and mixing properties of colloidal suspensions. A special emphasis is given to recent numerical methods to simulate driven colloidal suspensions at large scales. In combination with experiments, they help us to understand emergent dynamics and to identify control parameters for both individual and collective motion in colloidal suspensions.

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Magnetic Propulsion of Self-Assembled Colloidal Carpets: Efficient Cargo Transport via a Conveyor-Belt Effect

Cited by 104 publications

References 42 publications

Propulsion and hydrodynamic particle transport of magnetically twisted colloidal ribbons

Propulsion and hydrodynamic particle transport of magnetically twisted colloidal ribbons

Active colloidal propulsion over a crystalline surface

Leveraging collective effects in externally driven colloidal suspensions: experiments and simulations

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