Camphor-Engine-Driven Micro-Boat Guides Evolution of Chemical Gardens

Frenkel, Mark; Multanen, Victor; Grynyov, Roman; Musin, Albina; Bormashenko, Yelena; Bormashenko, Edward

doi:10.1038/s41598-017-04337-w

Cited by 13 publications

(12 citation statements)

References 62 publications

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“…Many of them are driven by the gradient of surface tension or interfacial tension in nonequilibrium condition. They represent an interesting manifestation of nonequilibrium evolution and mimic the motions of living organisms [7][8][9][10][11][12][13][14][15][16][17][18] . Symmetric properties of self-propelled objects are important to understand the character of their motion 19 .…”

Section: Introductionmentioning

confidence: 99%

On a simple model that explains inversion of a self-propelled rotor under periodic stop-and-release-operations

Koyano

Kitahata

Nakata

et al. 2020

Chaos: An Interdisciplinary Journal of Nonlinear Science

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We propose a simple mathematical model that describes the time evolution of a self-propelled object on a liquid surface using such variables as the object location, the surface concentration of active molecules and the hydrodynamic surface flow. The model is applied to simulate the time evolution of a rotor composed of a polygonal plate with camphor pills at its corners. We have qualitatively reproduced results of experiments, in which the inversion of rotational direction under periodic stop-and-release operations was investigated. The model correctly describes the probability of the inversion as a function of the duration of the phase when the rotor is stopped. Moreover, the model allows to introduce the rotor asymmetry unavoidable in real experiments and study its influence on the studied phenomenon. Our numerical simulations have revealed that the probability of the inversion of rotational direction is determined by the competition among the transport of the camphor molecules by the flow, the intrinsic asymmetry of the rotor, and the noise amplitude.

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Section: Introductionmentioning

confidence: 99%

On a simple model that explains inversion of a self-propelled rotor under periodic stop-and-release-operations

Koyano

Kitahata

Nakata

et al. 2020

Chaos: An Interdisciplinary Journal of Nonlinear Science

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“…On prebiotic earth, these formations may have facilitated the harvesting of energy across chemical gradients, [11] possibly promoting the very first reactions to yield molecules essential to life, such as amino acids [12] and RNA oligomers [13] . Moreover, chemical gardens are also being utilised as a source of inspiration for the development of novel technologies and systems, including biomedical materials, [14,15] chemical motors [16] and chemical clocks [17] …”

Section: Introductionmentioning

confidence: 99%

Exploring the Formation of Calcium Orthophosphate‐Pyrophosphate Chemical Gardens

et al. 2021

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Chemical gardens are characterised by the self‐assembly of mineralised abiotic architectures. Utilising the fundamental building blocks of bone mineral, namely calcium and orthophosphate ions, chemical gardens that recapitulate microstructural and compositional features of hard tissue can be grown. Interplay between orthophosphate and pyrophosphate species is highly relevant to natural mineral deposition processes, though this has yet to be explored in the context of generating biologically relevant chemical gardens. Here, tubular calcium orthophosphate‐pyrophosphate chemical gardens were grown from the interface between calcium loaded hydrogels ([Ca2+]=1 M) layered with different orthophosphate‐pyrophosphate solutions ([Pi]+[PPi]=0.7 M). We determine the effect of solution pyrophosphate content on chemical garden morphology and growth rate. Extracted structures were analysed by means of powder X‐ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and X‐ray fluorescence spectroscopy (XRF), revealing orthophosphate‐pyrophosphate solution dependent differences in precipitated mineral crystallinity, composition and microstructure, respectively. Lastly, the potential application of the structures is discussed in the context of tissue engineering and regenerative medicine.

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“…The common mechanisms for the autonomous motion of droplets involve a Marangoni effect induced by surface tension gradients. 9,15,[22][23][24][25][26][27] Droplets can travel over a long distance as long as the driving force from the unequilibrated chemical constituent can be sustained.…”

Section: Introductionmentioning

confidence: 99%

How fast do microdroplets generated during liquid-liquid phase separation move in a confined 2D space?

Arends

Shaw

Zhang

2021

Preprint

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How liquid transport occurs in confined spaces is relevant to many industrial and lab-scale processes, ranging from enhanced oil recovery to drug delivery systems. In this work, we investigate propelling microdroplets that form from liquid-liquid phase separation in a quasi-2D chamber, focusing on the direction and speed of microdroplets in response to local composition gradients. The confined ternary solution in our experiments comprises a model oil (the main one being octanol), a good solvent (ethanol) and a poor solvent (water). It is displaced by water. Depending on the initial solution composition, water-rich or oil-rich microdroplets, ∼ 1/4 − 1/3 of the height of a narrow and wide microchamber, form and move spontaneously as the ternary solution mixes with and is displaced by water diffusing from a deep side channel. Microdroplet movement is followed in situ using high-speed bright-field imaging or fluorescence imaging when the solution is doped with a dye. Local ethanol composition gradients are estimated from the variation of fluorescence intensity in the local continuous liquid surrounding

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Camphor-Engine-Driven Micro-Boat Guides Evolution of Chemical Gardens

Cited by 13 publications

References 62 publications

On a simple model that explains inversion of a self-propelled rotor under periodic stop-and-release-operations

On a simple model that explains inversion of a self-propelled rotor under periodic stop-and-release-operations

Exploring the Formation of Calcium Orthophosphate‐Pyrophosphate Chemical Gardens

How fast do microdroplets generated during liquid-liquid phase separation move in a confined 2D space?

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