Wave Mediated Synchronization of Nonuniform Oscillatory Media

Kheowan, On-Uma; Mihaliuk, Eugene; Blasius, Bernd; Sendiña‐Nadal, Irene; Showalter, Kenneth

doi:10.1103/physrevlett.98.074101

Cited by 50 publications

(47 citation statements)

References 25 publications

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“…Finally, we note that such chemically initiated communication is not restricted to just BZ gels, and is observed in other heterogeneous BZ systems. [72][73][74][75][76][77] The experiments performed by Yoshida et al 68 provided the first evidence that the dynamic behavior of a system of many self-oscillating BZ gels could be engineered by tailoring the shape and spatial arrangement of the constituent pieces. The fabrication technique developed in the latter study opened a new route to creating novel biomimetic chemomechanical devices based on the self-oscillating gels.…”

Section: Passage Of Chemo-mechanical Waves Through Adjacent Samplesmentioning

confidence: 99%

“…Furthermore, in a system containing multiple oscillators, the region with the highest frequency determines the ultimate direction of wave propagation. 90,91 In our BZ cilium, each element acts as an oscillator, and the intrinsic frequency of this oscillator depends on the boundary values of u in the outer fluid and neighboring elements. (The intrinsic frequency 66 of a small region of the gel refers to the frequency of the oscillations that an isolated gel of the same size would exhibit if it were placed in a fluid with the same value of u.)…”

Section: Response Of a Single Cilium To Variations In Umentioning

confidence: 99%

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Chemo-responsive, self-oscillating gels that undergo biomimetic communication

et al. 2013

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Species ranging from single-cell organisms to social insects can undergo auto-chemotaxis, where the entities move towards a chemo-attractant that they themselves emit. Polymer gels undergoing the self-oscillating Belousov-Zhabotinsky (BZ) reaction exhibit autonomous, periodic pulsations, which produce chemical species collectively referred to as the activator. The diffusion of this activator into the surrounding solution affects the dynamic behavior of neighboring BZ gels and hence, the BZ gels not only emit, but also respond to self-generated chemical gradients. This review describes recent experimental and computational studies that reveal how this biomimetic behavior effectively allows neighboring BZ gels to undergo cooperative, self-propelled motion. These distinctive properties of the BZ gels provide a route for creating reconfigurable materials that autonomously communicate with neighboring units and thereby actively participate in constructing the desired structures.

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Section: Passage Of Chemo-mechanical Waves Through Adjacent Samplesmentioning

confidence: 99%

Section: Response Of a Single Cilium To Variations In Umentioning

confidence: 99%

Chemo-responsive, self-oscillating gels that undergo biomimetic communication

et al. 2013

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“…Because the concentration of u is higher for the "inner" surfaces of the cubes than the outer surfaces, the inner surfaces have a higher intrinsic frequency. * It is known that in a system containing multiple oscillators, the region with the highest frequency determines the ultimate direction of wave propagation (24,25). In our BZ cubes, each element effectively acts as an oscillator; hence, the propagation of the chemical wave through each sample originates from the region with the highest oscillation frequency (23).…”

mentioning

confidence: 99%

Reconfigurable assemblies of active, autochemotactic gels

Dayal

Kuksenok

Balazs

2012

Proc. Natl. Acad. Sci. U.S.A.

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Using computational modeling, we show that self-oscillating Belousov-Zhabotinsky (BZ) gels can both emit and sense a chemical signal and thus drive neighboring gel pieces to spontaneously self-aggregate, so that the system exhibits autochemotaxis. To the best of our knowledge, this is the closest system to the ultimate selfrecombining material, which can be divided into separated parts and the parts move autonomously to assemble into a structure resembling the original, uncut sample. We also show that the gels' coordinated motion can be controlled by light, allowing us to achieve selective self-aggregation and control over the shape of the gel aggregates. By exposing the BZ gels to specific patterns of light and dark, we design a BZ gel "train" that leads the movement of its "cargo." Our findings pave the way for creating reconfigurable materials from self-propelled elements, which autonomously communicate with neighboring units and thereby actively participate in constructing the final structure.self-oscillating gels | autochemotactic gels | autochemotactic self-organization S pecies ranging from single-cell organisms to social insects can undergo autochemotaxis, where the entities move toward a chemo-attractant that they themselves emit. This mode of signaling allows the organisms to form large-scale structures, with amoebas (1) and Escherichia coli (2) self-organizing into extensive multicellular clusters and termites constructing macroscopic mounds (3). Notably there are few equivalents of such autochemotactic-driven assembly in the synthetic world. Although researchers have devised a range of nano-and microscopic selfpropelled particles (4), hardly any exhibit autochemotaxis (5) that leads to the formation of extended structures (6). Although recent theoretical models provide insight into the autochemotaxis of a self-propelled walker (7) and active Brownian particles (8), these studies provide few guidelines for synthesizing specific materials that display autochemotactic self-organization. The latter materials would open new routes for dynamic, reconfigurable self-assembly, where self-propelled elements communicate with neighboring units and thereby actively participate in constructing the final structure. Herein, we use computational modeling to show that millimeter-sized polymer gels can display such self-sustained, autochemotatic behavior. In particular, we demonstrate that gels undergoing the self-oscillating Belousov-Zhabotinsky (BZ) reaction (9) not only respond to a chemical signal from the surrounding solution, but also emit this signal and thus, multiple neighboring gel pieces can spontaneously self-aggregate into macroscopic objects. These findings indicate that BZ gels can undergo a form of "selfrecombining": if a BZ gel is cut into distinct pieces and the pieces are moved relatively far apart, then their autochemotactic behavior drives the parts to move autonomously and recombine into a structure resembling the original, uncut sample (Fig. 1). We also show that the gels' coordinated motion can ...

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“…3a, e, it can be seen that the 'inner' surfaces of the gel cubes (those facing the center of the simulation box) are exposed to the highest concentration of u and hence, have the highest intrinsic frequency [36]. In systems of coupled oscillators, the one with the highest intrinsic frequency initiates the chemical waves traveling throughout the system [38,39]. Hence for the system in Fig.…”

Section: Self-propelled Motion Of Oscillating Gelsmentioning

confidence: 94%

Designing biomimetic reactive polymer gels

et al. 2014

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Materials of the future will exhibit bio-inspired behavior that enables a range of novel applications. We review computational studies on reactive gels that reveal how to tailor the gels and external stimuli to impart this biomimetic functionality. For example, photo-responsive gels can be 'molded' by light into various three-dimensional shapes, permitting a single sample to have multiple uses. Reactive gels undergoing the Belousov-Zhabotinsky (BZ) reaction 'communicate' to form self-rotating gears, which could perform autonomous work. Finally, nanorod-filled reactive gels effectively regenerate the gel matrix when a layer of the material is sliced-off and thus, dramatically extend the material's life time.

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Wave Mediated Synchronization of Nonuniform Oscillatory Media

Cited by 50 publications

References 25 publications

Chemo-responsive, self-oscillating gels that undergo biomimetic communication

Chemo-responsive, self-oscillating gels that undergo biomimetic communication

Reconfigurable assemblies of active, autochemotactic gels

Designing biomimetic reactive polymer gels

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