Run-and-Halt Behavior of Motile Droplets in Response to Light

Ryabchun, Alexander; Babu, Dhanya; Movilli, Jacopo; Katsonis, Nathalie

doi:10.26434/chemrxiv.14417552.v1

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…By incorporating chiral molecular motors into a nematic LC, Lancia et al (2019) prepared cholesteric droplets whose helical trajectories and handedness could be controlled by an external light. In a similar spirit, light-controlled switches of the conformation of the surfactant covering the droplet surface can be used to change the droplet solubilization rate and produce run-and-halt motions (Ryabchun et al 2021). The sensitive conditions for the internal kinetics of chemically reacting droplets can also be used to control the propulsion mode, such as the pH of the outer fluid (Ban et al 2013) or the internal state of the oscillatory BZ reaction (Kitahata et al 2011, Thutupalli & Herminghaus 2013, Suematsu et al 2021.…”

Section: Coupling With the Droplet Internal Dynamics And Control Oppo...mentioning

confidence: 99%

Self-Propulsion of Chemically Active Droplets

Michelin

2023

Annu. Rev. Fluid Mech.

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Microscopic active droplets are able to swim autonomously in viscous flows. This puzzling feature stems from solute exchanges with the surrounding fluid via surface reactions or their spontaneous solubilization and from the interfacial flows resulting from these solutes’ gradients. Contrary to asymmetric active colloids, these isotropic droplets swim spontaneously by exploiting the nonlinear coupling of solute transport with self-generated Marangoni flows; such coupling is also responsible for secondary transitions to more complex individual and collective dynamics. Thanks to their simple design and their sensitivity to physico-chemical signals, these droplets are fascinating to physicists, chemists, biologists, and fluid dynamicists alike in analyzing viscous self-propulsion and collective dynamics in active-matter systems, developing synthetic cellular models, or performing targeted biomedical or engineering applications. I review here the most recent and significant developments of this rapidly growing field, focusing on the mathematical and physical modeling of these intriguing droplets, together with their experimental design and characterization. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 55 is January 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Coupling With the Droplet Internal Dynamics And Control Oppo...mentioning

confidence: 99%

Self-Propulsion of Chemically Active Droplets

Michelin

2023

Annu. Rev. Fluid Mech.

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“…Incorporating chiral molecular motors into a nematic liquid crystal, Lancia et al (2019) prepared cholesteric droplets whose helical trajectories and their handedness can be controlled by an external light. In a similar spirit, light-controlled switches of the conformation of the surfactant covering the droplet surface can be used to change the droplet solubilisation rate and produce run-andhalt motions (Ryabchun et al 2021). The sensitive conditions for the internal kinetics of chemically-reacting droplets can also be used to control the propulsion mode, such as the pH of the outer fluid (Ban et al 2013), or the internal state of the oscillatory BZ reaction (Kitahata et al 2011, Thutupalli & Herminghaus 2013, Suematsu et al 2021).…”

Section: Topological Defectmentioning

confidence: 99%

Self-propulsion of chemically-active droplets

Michelin¹

2022

Preprint

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Microscopic active droplets are able to swim autonomously in viscous flows: this puzzling feature stems from solute exchanges with the surrounding fluid via surface reactions or their spontaneous solubilisation, and the interfacial flows resulting from these solutes' gradients. Contrary to asymmetric active colloids, these isotropic droplets swim spontaneously by exploiting the nonlinear coupling of solute transport with self-generated Marangoni flows, which is also responsible for secondary transitions to more complex individual and collective dynamics. Thanks to their simple design and their sensitivity to physico-chemical signals, they are fascinating physicists, chemists, biologists and fluid dynamicists alike to analyse viscous self-propulsion and collective dynamics in active matter systems, to develop synthetic cellular models or to perform targeted biomedical or engineering applications. I review here the most recent and significant developments of this rapidlygrowing field, focusing on the mathematical and physical modelling of these intringuing droplets, together with its experimental design and characterisation.

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Reversible morphology-resolved chemotactic actuation and motion of Janus emulsion droplets

2022

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We report, for the first time, a chemotactic motion of emulsion droplets that can be controllably and reversibly altered. Our approach is based on using biphasic Janus emulsion droplets, where each phase responds differently to chemically induced interfacial tension gradients. By permanently breaking the symmetry of the droplets’ geometry and composition, externally evoked gradients in surfactant concentration or effectiveness induce anisotropic Marangoni-type fluid flows adjacent to each of the two different exposed interfaces. Regulation of the competitive fluid convections then enables a controllable alteration of the speed and the direction of the droplets’ chemotactic motion. Our findings provide insight into how compositional anisotropy can affect the chemotactic behavior of purely liquid-based microswimmers. This has implications for the design of smart and adaptive soft microrobots that can autonomously regulate their response to changes in their chemical environment by chemotactically moving towards or away from a certain target, such as a bacterium.

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Run-and-Halt Behavior of Motile Droplets in Response to Light

Cited by 4 publications

References 27 publications

Self-Propulsion of Chemically Active Droplets

Self-Propulsion of Chemically Active Droplets

Self-propulsion of chemically-active droplets

Reversible morphology-resolved chemotactic actuation and motion of Janus emulsion droplets

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