Nonequilibrium strongly hyperuniform fluids of circle active particles with large local density fluctuations

Lei, Qun-Li; Ciamarra, Massimo Pica; Ni, Ran

doi:10.1126/sciadv.aau7423

Cited by 119 publications

(117 citation statements)

References 40 publications

(110 reference statements)

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“…This class of circle swimmers can also self-organize into a pattern of rotating microflocks with a well-defined length-scale which can be controlled by the swimming speed and rotation frequency of the individual microswimmers 19,21 , resembling the patterns seen in ensembles of sperm cells 3 . Circle swimmers with spherical body shapes, which do not align, but sterically repel each other can form hyperuniform states 22 and aggregate in (macro)clusters 23,24 which can even counterrotate with respect to the surrounding gas 23 .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous phase separation and pattern formation in chiral active mixtures

Levis

Liebchen

2019

Phys. Rev. E

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Chiral active particles, or self-propelled circle swimmers, from sperm cells to asymmetric Janus colloids, form a rich set of patterns, which are different from those seen in linear swimmers. Such patterns have mainly been explored for identical circle swimmers, while real-world circle swimmers, typically possess a frequency distribution. Here we show that even the simplest mixture of (velocity-aligning) circle swimmers with two different frequencies, hosts a complex world of superstructures: The most remarkable example comprises a microflock pattern, formed in one species, while the other species phase separates and forms a macrocluster, coexisting with a gas phase. Here, one species microphaseseparates and selects a characteristic length scale, whereas the other one macrophase separates and selects a density. A second notable example, here occurring in an isotropic system, are patterns comprising two different characteristic length scales, which are controllable via frequency and swimming speed of the individual particles.

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Section: Introductionmentioning

confidence: 99%

Simultaneous phase separation and pattern formation in chiral active mixtures

Levis

Liebchen

2019

Phys. Rev. E

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“…ies have focused on pattern formation in chiral active particles [43][44][45][46][47][48], but leave the synchronization behavior of large ensembles essentially open. (ii) In the field of synchronization, in turn, there is an impressive body of knowledge on the large-scale synchronization of oscillators which are localized in space [22,23], or move in a way that is unaffected by their phases [49][50][51][52] -but not for the above active-oscillator examples, which show a two-way coupling between phase and displacement through space.…”

mentioning

confidence: 99%

Activity induced synchronization: Mutual flocking and chiral self-sorting

Levis

Pagonabarraga

Liebchen

2019

Phys. Rev. Research

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Synchronization, the temporal coordination of coupled oscillators, allows fireflies to flash in unison, neurons to fire collectively and human crowds to fall in step on the London millenium bridge. Here, we interpret active (or self-propelled) chiral microswimmers with a distribution of intrinsic frequencies as motile oscillators and show that they can synchronize over very large distances, even for local coupling in 2D. This opposes to canonical non-active oscillators on static or timedependent networks, leading to synchronized domains only. A consequence of this activity-induced synchronization is the emergence of a "mutual flocking phase", where particles of opposite chirality cooperate to form superimposed flocks moving at a relative angle to each other, providing a chiral active matter analogue to the celebrated Toner-Tu phase. The underlying mechanism employs a positive feedback loop involving the two-way coupling between oscillators' phase and self-propulsion, and could be exploited as a design principle for synthetic active materials and chiral self-sorting techniques. *

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“…[ 6 ] Envisioned as microdrillers, [ 7 ] microstirrers, [ 8 ] and micromixers, [ 9 ] microrotors could find potential uses in microfluidics, [ 10 ] thrombolysis, [ 11 ] minimally invasive surgery, [ 7b,12 ] power sources for microdevices, [ 13 ] among others. For basic sciences, microrotors are a popular model system for active matter and active colloids, [ 1c,14 ] especially in the studies of phase separation, [ 15 ] dynamic self‐assembly, [ 16 ] hyperuniformity, [ 17 ] and other collective behaviors.…”

Section: Introductionmentioning

confidence: 99%

Tadpole‐Shaped Catalytic Janus Microrotors Enabled by Facile and Controllable Growth of Silver Nanotails

Xiao

Zhou

et al. 2020

Adv Funct Materials

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Microrotors are an indispensable component in micromachines, yet their usefulness has been limited by a lack of simple, inexpensive, and controlled fabrication technique that yields microrotors of controlled shapes in large quantities. To address this challenge, the chemical synthesis, characterization, and activation of tadpole-shaped catalytic microrotors that consist of a spherical, platinum (Pt)-coated head and a silver (Ag) nano-tail of tunable lengths are reported herein. Importantly, this tail spontaneously grows on Pt in an aqueous solution of Ag + and hydrogen peroxide (H 2 O 2), at a speed of ≈100 nm s −1 , preferably along the Ag (111) plane. The growth of Ag nanowires is attributed to an electrochemical reaction occurring on a tapered Pt cap, a mechanism corroborated by control experiments with photo-active titania microspheres, which introduce the additional advantage of light-controlled growth. The presence of a long Ag nano-tail on a tadpole-shaped microrotor breaks its symmetry and induces rotation in H 2 O 2 , and its structure-dependent dynamics is quantitatively studied and supported by numerical simulation. The chemical synthesis of microrotors with Ag nano-tails will introduce new designs of micromachines of controlled dynamics, as well as functional materials and devices where mild, controllable, and facile growth of Ag nanostructures is desired.

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Nonequilibrium strongly hyperuniform fluids of circle active particles with large local density fluctuations

Abstract: Dynamic hierarchical structures with strong hyperuniformity are found in chiral active matter systems.

Cited by 119 publications

References 40 publications

Simultaneous phase separation and pattern formation in chiral active mixtures

Simultaneous phase separation and pattern formation in chiral active mixtures

Activity induced synchronization: Mutual flocking and chiral self-sorting

Tadpole‐Shaped Catalytic Janus Microrotors Enabled by Facile and Controllable Growth of Silver Nanotails

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