Spontaneous Oscillations and Synchronization of Active Droplets on a Water Surface via Marangoni Convection

Chen, Yongjun; Sadakane, Koichiro; Sakuta, Hiroki; Yao, Chenggui; Yoshikawa, Kenichi

doi:10.1021/acs.langmuir.7b03061

Cited by 16 publications

(15 citation statements)

References 34 publications

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“…In binary systems, pulsations accompanied by the ejection of a ring of droplets were observed on a very short time scale for a cooled drop of 1-butanol deposited on a heated water phase 19 . Shape oscillations were recently reported with a drop of aniline deposited on an aqueous aniline solution 20 . Contamination of the drop surroundings was due to the ejection of aniline onto the free surface, the regeneration processes being attributed to periodical mixing of the aqueous phase ensured by Marangoni convection and initiated by the accumulation of aniline at the drop edge.…”

Section: Introductionmentioning

confidence: 88%

Marangoni-driven flower-like patterning of an evaporating drop spreading on a liquid substrate

et al. 2018

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Drop motility at liquid surfaces is attracting growing interest because of its potential applications in microfluidics and artificial cell design. Here we report the unique highly ordered pattern that sets in when a millimeter-size drop of dichloromethane spreads on an aqueous substrate under the influence of surface tension, both phases containing a surfactant. Evaporation induces a Marangoni flow that forces the development of a marked rim at the periphery of the spreading film. At some point this rim breaks up, giving rise to a ring of droplets, which modifies the aqueous phase properties in such a way that the film recoils. The process repeats itself, yielding regular large-amplitude pulsations. Wrinkles form at the film surface due to an evaporative instability. During the dewetting stage, they emit equally spaced radial strings of droplets which, combined with those previously expelled from the rim, make the top view of the system resemble a flower.

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Section: Introductionmentioning

confidence: 88%

Marangoni-driven flower-like patterning of an evaporating drop spreading on a liquid substrate

et al. 2018

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“…Recently, we have reported the up−down self-propelled motion for a floating oil droplet by prohibiting translational motion using a thin glass rod. 43 It was found that a pair of neighboring droplets undergo an in-phase synchronization. Such an experimental trend was argued in terms of the Marangoni effect under gravitational instability for a heavy oil droplet.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Figure c1 shows the spatiotemporal diagram when the intervening pipette was positioned on the right-hand side of the waterway, revealing the appearance of a 2:1 synchronization of the back-and-forth motion. Recently, we have reported the up–down self-propelled motion for a floating oil droplet by prohibiting translational motion using a thin glass rod . It was found that a pair of neighboring droplets undergo an in-phase synchronization.…”

Section: Resultsmentioning

confidence: 99%

Self-Synchronous Swinging Motion of a Pair of Autonomous Droplets

et al. 2019

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Synchronized motion between two self-running oil droplets floating on an aqueous phase is reported. We describe the results of our observation on the interference between a pair of centimeter-sized nitrobenzene droplets undergoing back-and-forth motion on a waterway. The two droplets exhibit a swinging type of synchronization when a thin glass capillary is placed at the midpoint of the waterway with a narrow rectangle shape. Furthermore, 2:1 synchronized oscillation of the periodicities of this back-and-forth motion is generated when the capillary is shifted away from the center of the waterway. We discuss the mechanism of the emergence of synchronized swinging motion for the pair of droplets based on a simple mathematical model with nonlinear coupled differential equations.

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“…In the case of surfing drops, the Marangoni stress may be induced by evaporation (5), the combined effects of dissolution and evaporation (1; 2), or a combination of dissolution, evaporation and surfactant migration (3). Related phenomena such as drop pulsations (8), spontaneous rotation or emission of satellite droplets (10) are also directly linked to Marangoni effects induced by evaporation, dissolution, surfactant transport or chemical reactions in specific fluid systems.…”

Section: Graphical Abstractmentioning

confidence: 99%

Spontaneous spinning of a dichloromethane drop on an aqueous surfactant solution

Boniface¹,

Sebilleau²,

Magnaudet³

et al. 2022

Preprint

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We report a series of experiments carried out with a dichloromethane drop deposited on the surface of an aqueous solution containing a surfactant, cetyltrimethylammonium bromide. After an induction stage during which the drop stays axisymmetric, oscillations occur along the contact line. These oscillations are succeeded by a spectacular spontaneous spinning of the drop. The latter quickly takes the form of a two-tip 'rotor' and the spinning rate stabilizes at a constant value, no longer varying despite the gradual changes of the drop shape and size. The drop eventually disappears due to the continual dissolution and evaporation of dichloromethane.Schlieren visualizations and particle image velocimetry are used to establish a consistent scenario capable of explaining the evolution of the system. The Marangoni effect induced by the dissolution of dichloromethane in the drop vicinity is shown to be responsible for the observed dynamics. Arguments borrowed from dynamical systems theory and from an existing low-order model allow us to explain qualitatively why the system selects the spinning configuration. The geometry of the immersed part of the drop is shown to play a crucial role in this selection process, as well as in the regulation of the spinning rate.

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Spontaneous Oscillations and Synchronization of Active Droplets on a Water Surface via Marangoni Convection

Cited by 16 publications

References 34 publications

Marangoni-driven flower-like patterning of an evaporating drop spreading on a liquid substrate

Marangoni-driven flower-like patterning of an evaporating drop spreading on a liquid substrate

Self-Synchronous Swinging Motion of a Pair of Autonomous Droplets

Spontaneous spinning of a dichloromethane drop on an aqueous surfactant solution

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