Chemically-mediated communication in self-oscillating, biomimetic cilia

Dayal, Pratyush; Kuksenok, Olga; Bhattacharya, Amitabh; Balazs, Anna C.

doi:10.1039/c1jm13787e

Cited by 46 publications

(105 citation statements)

References 40 publications

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“…As we show below, whether it is the pulsations of a single cilium or the collective bending of multiple cilia, these filaments not only sense, but also move in response to the local gradients in u. 66 In effect, these artificial cilia mimic the ability of biological species to direct their motion along chemical concentration gradients.…”

Section: Resultsmentioning

confidence: 90%

“…66 Hence, we could capture the interplay between the pulsations of the cilia and the dispersion of u, where the motion of the cilia affects the distribution of u, which in turn affects the movement of the cilia.…”

Section: Methodology and Model Parametersmentioning

confidence: 99%

“…In the simulations presented below, the dimensionless velocity of the gel's expansion/contraction is approximately 0.1, which corresponds to approximately v = 8 mm s À1 using the scaling provided below. 66 If hydrodynamic effects were taken into account, one would expect the characteristic velocities created in the fluid by the cilia motion to be of the same order of magnitude as this v, which in turn would correspond to a low Reynolds numbers of 66 Re B 10 À2 (assuming the viscosity of the solution equals that of water and taking the length of the cilium, 1.3 mm (see below), to be the characteristic length scale). The hydrodynamic forces acting from the fluid on the gel surface would be negligibly small due to the low ratio of viscous to elastic forces; this ratio, the relevant capillary number 86 can be estimated as 66 Ca B 6 Â 10 À11 , where the bulk modulus of the NIPAAm gel is taken to be 10 5 Pa, 87 and again the length of a cilium is taken as the characteristic length scale.…”

Section: Methodology and Model Parametersmentioning

confidence: 99%

“…66 The details of these model modifications are given in Section 4 below, followed by the results of computer simulations on the communication among the multiple BZ gel samples that are either attached to a substrate, freely slide along a substrate, or suspended in solution. Before presenting the results of these computer simulations, we first review current experimental advance for solution-mediated communication among multiple BZ gels.…”

Section: Dynamics Of the Bz Gelsmentioning

confidence: 99%

“…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.) For u top = 0.0, the fixed end of the gel has the highest intrinsic frequency and hence, the traveling waves propagate bottom-up.…”

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: Resultsmentioning

confidence: 90%

Section: Methodology and Model Parametersmentioning

confidence: 99%

Section: Methodology and Model Parametersmentioning

confidence: 99%

Section: Dynamics Of the Bz Gelsmentioning

confidence: 99%

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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Designed Autonomic Motion in Heterogeneous Belousov–Zhabotinsky (BZ)‐Gelatin Composites by Synchronicity

Smith

Slone

Heitfeld

et al. 2013

Adv Funct Materials

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Critical technologies from medicine to defense are highly dependent on advanced composite materials. Increasingly there is a greater demand for materials with expanded functionality. The state of the art includes a wide range of responsive composites capable of impressive structural feats such as externally triggered shape morphing. Here a different composite concept is presented, one in which a portion of the constituent materials feed off of ambient energy and dynamically couple to convert it to mechanical motion in a cooperative, biomimetic fashion. Using a recently developed self-oscillating gel based on gelatin and the oscillating Belousov-Zhabotinsky (BZ) reaction, a technique is demonstrated for producing continuous patterned heterogeneous BZ hydrogel composites capable of sustained autonomic function. The coupling between two adjacent reactive patches is demonstrated in an autonomic cantilever actuator which converts chemical energy into amplifi ed mechanical motion. The design of heterogeneous BZ gels for motion using a basic fi nite element model is discussed. This work represents notable progress toward developing internally responsive, bio-inspired composite materials for constructing modular autonomic morphing structures and devices.

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Removal of Microparticles by Ciliated Surfaces—an Experimental Study

Zhang

Wang

Onck³

et al. 2018

Adv Funct Materials

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Biological cilia are versatile hair-like organelles that are very efficient in manipulating particles for, e.g., feeding, antifouling and cell transport. Inspired by the versatility of cilia, this paper experimentally demonstrates active particle-removal by self-cleaning surfaces that are fully or partially covered with micro-molded magnetic artificial cilia (MAC). Actuated by a rotating magnet, the MAC can perform a tilted conical motion, which leads to the removal of spherical particles of different sizes in water, as well as irregular-shaped sand grains both in water and in air.These findings can contribute to the development of novel particulate manipulation and selfcleaning/ antifouling surfaces, which can be applied, e.g., to prevent fouling of (bio)sensors in labon-a-chip devices, and to prevent biofouling of submerged surfaces such as marine sensors and water quality analyzers.

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Chemically-mediated communication in self-oscillating, biomimetic cilia

Cited by 46 publications

References 40 publications

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

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

Designed Autonomic Motion in Heterogeneous Belousov–Zhabotinsky (BZ)‐Gelatin Composites by Synchronicity

Removal of Microparticles by Ciliated Surfaces—an Experimental Study

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