Controlling active self-assembly through broken particle-shape symmetry

Wensink, H. H.; Kantsler, Vasily; Goldstein, Raymond E.; Dunkel, Jörn

doi:10.1103/physreve.89.010302

Cited by 77 publications

(109 citation statements)

References 54 publications

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“…For the future study, it would be interesting to investigate the influence of hydrodynamic interactions [37] and the dynamics of submersed passive particles whose motion is non-restricted, as well as other particle shapes such as L, C shapes [77,78] where stacking is also expected. However, there are also shapes where stacking is frustrated (like for T -shaped carriers) which are expected to form loosely-packed gels [79].…”

Section: Discussionmentioning

confidence: 99%

Motion of two micro-wedges in a turbulent bacterial bath

Kaiser

Sokolov

Aranson

et al. 2015

Eur. Phys. J. Spec. Top.

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Abstract. The motion of a pair of micro-wedges ("carriers") in a turbulent bacterial bath is explored using computer simulations with explicit modeling of the bacteria and experiments. The orientation of the two micro-wedges is fixed by an external magnetic field but the translational coordinates can move freely as induced by the bacterial bath. As a result, two carriers of same orientation move such that their mutual distance decreases, while they drift apart for an anti-parallel orientation. Eventually the two carriers stack on each other with no intervening bacteria exhibiting a stable dynamical mode where the two micro-wedges follow each other with the same velocity. These findings are in qualitative agreement with experiment on two micro-wedges in a bacterial bath. Our results provide insight into understanding selfassembly of many micro-wedges in an active bath.

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Section: Discussionmentioning

confidence: 99%

Motion of two micro-wedges in a turbulent bacterial bath

Kaiser

Sokolov

Aranson

et al. 2015

Eur. Phys. J. Spec. Top.

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“…Linear stability analysis around a fully ordered state shows that in the case of pushers (but not pullers) there is a finite-wavelength instability, and numerical studies reveal that the full model generates transient recurrent vortices and jets on large length scales, as seen in experiments. Many other models for this general phenomenon have been developed, both computational (Lushi, Goldstein & Shelley 2012) and continuum (Dunkel et al 2013a,b), the latter incorporating steric interactions between cells and exploring the role of particle shape (Wensink et al 2014). Computational models of discrete particles in particular have been able to study carefully the role of long-range hydrodynamic interactions in generating the collective state.…”

Section: Collective Behaviour In Microswimmer Suspensionsmentioning

confidence: 99%

Batchelor Prize Lecture Fluid dynamics at the scale of the cell

Goldstein

2016

J. Fluid Mech.

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The world of cellular biology provides us with many fascinating fluid dynamical phenomena that lie at the heart of physiology, development, evolution and ecology. Advances in imaging, micromanipulation and microfluidics over the past decade have made possible high-precision measurements of such flows, providing tests of microhydrodynamic theories and revealing a wealth of new phenomena calling out for explanation. Here I summarize progress in four areas within the field of 'active matter': cytoplasmic streaming in plant cells, synchronization of eukaryotic flagella, interactions between swimming cells and surfaces and collective behaviour in suspensions of microswimmers. Throughout, I emphasize open problems in which fluid dynamical methods are key ingredients in an interdisciplinary approach to the mysteries of life.

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“…Converting bacterial self-propulsion into mechanical energy has been considered previously for shuttles and cogwheels [18][19][20][21][22][23]. Most of the studies were restricted to low swimmer concentrations where swirling is absent.…”

mentioning

confidence: 99%

Transport Powered by Bacterial Turbulence

et al. 2014

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We demonstrate that collective turbulent-like motion in a bacterial bath can power and steer directed transport of mesoscopic carriers through the suspension. In our experiments and simulations, a microwedge-like "bulldozer" draws energy from a bacterial bath of varied density. We obtain that a maximal transport speed is achieved in the turbulent state of the bacterial suspension. This apparent rectification of random motion of bacteria is caused by polar ordered bacteria inside the cusp region of the carrier, which is shielded from the outside turbulent fluctuations. Introduction. Suspensions of bacteria or synthetic microswimmers show fascinating collective behavior emerging from their self-propulsion [1-4] which results in many novel active states such as swarming [5][6][7][8] and "active turbulence" [9][10][11][12][13][14]. In contrast to hydrodynamic turbulence, the apparent turbulent (or swirling) state occurs at exceedingly low Reynolds numbers but at relatively large bacterial concentrations.

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Controlling active self-assembly through broken particle-shape symmetry

Cited by 77 publications

References 54 publications

Motion of two micro-wedges in a turbulent bacterial bath

Motion of two micro-wedges in a turbulent bacterial bath

Batchelor Prize Lecture Fluid dynamics at the scale of the cell

Transport Powered by Bacterial Turbulence

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