Targeted assembly and synchronization of self-spinning microgears

Aubret, Antoine; Youssef, Mena; Sacanna, Stefano; Palacci, Jérémie

doi:10.1038/s41567-018-0227-4

Cited by 203 publications

(219 citation statements)

References 42 publications

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“…using the (in the homogeneous suspension exact) force closure Eq. (8). The pressure in the suspension due to the interaction forces is p IK = − tr σ IK /d.…”

Section: B Wall Forces and Pressurementioning

confidence: 99%

Collective forces in scalar active matter

Speck

2020

Soft Matter

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Large-scale collective behavior in suspensions of many particles can be understood from the balance of statistical forces emerging beyond the direct microscopic particle interactions. Here we review some aspects of the collective forces that can arise in suspensions of self-propelled active Brownian particles: wall forces under confinement, interfacial forces, and forces on immersed bodies mediated by the suspension. Even for non-aligning active particles, these forces are intimately related to a non-uniform polarization of particle orientations induced by walls and bodies, or inhomogeneous density profiles. We conclude by pointing out future directions and promising areas for the application of collective forces in synthetic active matter, as well as their role in living active matter.

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“…using the (in the homogeneous suspension exact) force closure Eq. (8). The pressure in the suspension due to the interaction forces is p IK = − tr σ IK /d.…”

Section: B Wall Forces and Pressurementioning

confidence: 99%

Collective forces in scalar active matter

Speck

2020

Soft Matter

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“…, 14] and sperm cells [4,15] near surfaces, and magnetotactic bacteria in rotating fields [16,17]. Artificial chiral active systems have also been developed, such as colloids [18][19][20][21][22][23][24], millimeter-scale magnets [25,26] and rotating granular particles [27][28][29][30]. Multiple numerical and theoretical studies on chiral active fluid have been carried out [27,[31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Robust boundary flow in chiral active fluid

et al. 2020

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We perform experiments on an active chiral fluid system of self-spinning rotors in confining boundary. Along the boundary, actively rotating rotors collectively drives a unidirectional material flow. We systematically vary rotor density and boundary shape; boundary flow robustly emerges under all conditions. Flow strength initially increases then decreases with rotor density (quantified by area fraction φ); peak strength appears around a density φ = 0.65. Boundary curvature plays an important role: flow near a concave boundary is stronger than that near a flat or convex boundary in the same confinements. Our experimental results in all cases can be reproduced by a continuum theory with single free fitting parameter, which describes the frictional property of the boundary.Our results support the idea that boundary flow in active chiral fluid is topologically protected; such robust flow can be used to develop materials with novel functions. *

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“…Finally, the temperature response of active fluids was not only reversible but also nearly immediate. Such an instant response enabled the design of active fluids whose activities were switchable, reinforcing the feasibility of controlling active matter in situ using temperature instead of electromagnetic control 4,5,[45][46][47][48][49] .…”

Section: Introductionmentioning

confidence: 99%

Collective dynamics of microtubule-based 3D active fluids from single microtubules

et al. 2019

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Self-organization of kinesin-driven, microtubule-based 3D active fluids relies on the collective dynamics of single microtubules. However, the connection between macroscopic fluid flows and microscopic motion of microtubules remains unclear. In this work, the motion of single microtubules was characterized by means of 2D gliding assays and compared with the flows of 3D active fluids. While the scales of the two systems differ by ~1,000×, both were driven by processive, non-processive or an equal mixture of both molecular motor proteins. To search for the dynamic correlation between both systems, the motor activities were tuned by varying temperature and ATP concentration, and the changes in both systems were compared. Motor processivity played an important role in active fluid flows but only when the fluids were nearly motionless; otherwise, flows were dominated by hydrodynamic resistance controlled by sample size. Furthermore, while the motors' thermal reaction led active fluids to flow faster with increasing temperature, such temperature dependence could be reversed by introducing temperature-varying depletants, emphasizing the potential role of the depletant in designing an active fluid's temperature response. The temperature response of active fluids was nearly immediate (≲10 sec). Such a characteristic enables active fluids to be controlled with a temperature switch. Overall, this work not only clarifies the role of temperature in active fluid activity, but also sheds light on the underlying principles of the relationship between the collective dynamics of active fluids and the dynamics of their constituent single microtubules.

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Targeted assembly and synchronization of self-spinning microgears

Cited by 203 publications

References 42 publications

Collective forces in scalar active matter

Collective forces in scalar active matter

Robust boundary flow in chiral active fluid

Collective dynamics of microtubule-based 3D active fluids from single microtubules

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