Microfluidic flow actuation using magnetoactive suspensions

Alonso-Matilla, Roberto; Saintillan, David

doi:10.1209/0295-5075/121/24002

Cited by 15 publications

(15 citation statements)

References 38 publications

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“…For example, the magnetic alignment, combined with a micro-aerotactic swimming response, qualifies such micro-swimmers as a promising vector for targeted drug therapy [32]. Recently, it was proposed, on theoretical grounds, that a suspension of such magnetotactic bacteria could display original magneto-rheological properties [33,34], novel pattern formation [35] and hydrodynamic instabilities [36,37].…”

Section: Introductionmentioning

confidence: 99%

Magnetotactic bacteria in a droplet self-assemble into a rotary motor

et al. 2019

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From intracellular protein trafficking to large-scale motion of animal groups, the physical concepts driving the self-organization of living systems are still largely unraveled. Self-organization of active entities, leading to novel phases and emergent macroscopic properties, recently shed new light on these complex dynamical processes. Here we show that under the application of a constant magnetic field, motile magnetotactic bacteria confined in water-in-oil droplets self-assemble into a rotary motor exerting a torque on the external oil phase. A collective motion in the form of a large-scale vortex, reversable by inverting the field direction, builds up in the droplet with a vorticity perpendicular to the magnetic field. We study this collective organization at different concentrations, magnetic fields and droplet radii and reveal the formation of two torque-generating areas close to the droplet interface. We characterize quantitatively the mechanical energy extractable from this new biological and self-assembled motor.

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Section: Introductionmentioning

confidence: 99%

Magnetotactic bacteria in a droplet self-assemble into a rotary motor

et al. 2019

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“…Theoretically it is shown that MTB might present original magnetorheological properties and present novel collective behavior. [ 378–381 ] Experimentally, the MTB were shown to behave as rotary motors in oil–water emulsions for example and therefore their behavior in complex medium is an open field. [ 382 ] In this line, taking into account that among MTB strains they have different properties and needs, the same diversity is most likely to be translated to different collective behaviors which if controllable are of interest for the field or robotics.…”

Section: Discussion and Future Workmentioning

confidence: 99%

Magnetic Actuation Methods in Bio/Soft Robotics

Ebrahimi

Cappelleri

et al. 2020

Adv Funct Materials

174

104

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In recent years, magnetism has gained an enormous amount of interest among researchers for actuating different sizes and types of bio/soft robots, which can be via an electromagnetic‐coil system, or a system of moving permanent magnets. Different actuation strategies are used in robots with magnetic actuation having a number of advantages in possible realization of microscale robots such as bioinspired microrobots, tetherless microrobots, cellular microrobots, or even normal size soft robots such as electromagnetic soft robots and medical robots. This review provides a summary of recent research in magnetically actuated bio/soft robots, discussing fabrication processes and actuation methods together with relevant applications in biomedical area and discusses future prospects of this way of actuation for possible improvements in performance of different types of bio/soft robots.

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“…Colloidal suspensions of microscopic particles show complex and interesting collective behaviors. In particular, the collective dynamics of colloids is fundamental and ubiquitous for materials assembly [ 1 , 2 ], robotic motion [ 3 , 4 ], microfluidic control [ 5 , 6 ] and in several biological scenarios [ 7 , 8 ]. The collective dynamics of confined colloids can be completely different from that of free colloids: for instance, confined colloids can self-organize into vortex structures [ 9 , 10 ], coherent motion [ 11 ] or different phase behaviors [ 12–14 ].…”

Section: Introductionmentioning

confidence: 99%

“…The collective dynamics of confined colloids can be completely different from that of free colloids: for instance, confined colloids can self-organize into vortex structures [ 9 , 10 ], coherent motion [ 11 ] or different phase behaviors [ 12–14 ]. Through the manipulation of functional structure or swarms of confined colloids, microfluidic pumping [ 5 , 15 ], fluid actuation [ 6 ] or solute transport [ 16 ] could be achieved. However, due to the spontaneous and unexpected nature of colloidal suspensions, how to finely tune the collective dynamics of confined colloids remains a challenging task.…”

Section: Introductionmentioning

confidence: 99%

Reconfiguring confined magnetic colloids with tunable fluid transport behavior

Sheng

Zhang

Liu

et al. 2020

National Science Review

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Collective dynamics of confined colloids is crucial in diverse scenarios such as self-assembly and phase behavior in materials science, microrobot swarms for drug delivery, and microfluidic control. Yet, fine-tuning the dynamics of colloids in microscale confined spaces is still a formidable task due to the complexity of the dynamics of colloidal suspension and to the lack of methodology to probe colloids in confinement. Here, we show that the collective dynamics of confined magnetic colloids can be finely tuned by external magnetic fields. In particular, the mechanical properties of the confined colloidal suspension can be probed in real-time and this strategy can be also used to tune microscale fluid transport. Our experimental and theoretical investigations reveal that the collective configuration characterized by the colloidal entropy is controlled by the colloidal concentration, confining ratio, and external field strength and direction. Indeed, our results show that mechanical properties of the colloidal suspension as well as the transport of the solvent in microfluidic devices can be controlled upon tuning the entropy of the colloidal suspension. Our approach opens new avenues for the design and applications of drug delivery, microfluidic logic, dynamic fluid control, chemical reaction, and beyond.

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Microfluidic flow actuation using magnetoactive suspensions

Cited by 15 publications

References 38 publications

Magnetotactic bacteria in a droplet self-assemble into a rotary motor

Magnetotactic bacteria in a droplet self-assemble into a rotary motor

Magnetic Actuation Methods in Bio/Soft Robotics

Reconfiguring confined magnetic colloids with tunable fluid transport behavior

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