The Life of a Surface Bubble

Miguet, Jonas; Rouyer, Florence; Rio, Emmanuelle

doi:10.3390/molecules26051317

Cited by 21 publications

(17 citation statements)

References 65 publications

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“…It can remain stable in a fixed vertical position, limited by the diffusion rates of the gas from the surface‐anchored microbubbles into the bulk water and up to few hours. [ 49 ]…”

Section: Resultsmentioning

confidence: 99%

“…It can remain stable in a fixed vertical position, limited by the diffusion rates of the gas from the surfaceanchored microbubbles into the bulk water and up to few hours. [49] Figure 7 shows a variety of motion patterns in the vertical direction, generated by manual control (Figure 7a,b, see also Video S2, Supporting Information) and autonomous control (Figure 7c,d). In the manual mode, the operator chooses two control signals: one for the electrodes and one for the motor generating the mechanical vibrations.…”

Section: Buoyancy Autoregulationmentioning

confidence: 99%

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Backswimmer‐Inspired Miniature 3D‐Printed Robot with Buoyancy Autoregulation through Controlled Nucleation and Release of Microbubbles

Kobo

Pinchasik

2022

Advanced Intelligent Systems

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The backswimmer is an aquatic insect, capable of regulating its buoyancy underwater. When it enters the water, it entraps an air bubble in a superhydrophobic hairy structure covering its abdomen. While this bubble is mainly used for respiration, it also functions as an external inflatable gas reservoir for buoyancy regulation. Namely, hemoglobin is used to store and release oxygen to the entrapped bubble, reversibly. This way, it can reach neutral buoyancy without further energy consumption. Herein, a small, centimeter‐scale, backswimmer‐inspired untethered robot (BackBot) with autobuoyancy regulation through controlled nucleation and release of microbubbles is developed. The bubbles nucleate and grow directly on onboard electrodes through electrolysis, regulated by low voltage. A bubble‐entrapping 3D‐printed canopy is introduced to create a stable external gas reservoir. To reduce buoyancy forces, the bubbles are released through linear mechanical vibrations of the canopy, decoupled from the robot's body. Through pressure sensing and a proportional integral derivative control loop mechanism, the robot autoregulates its buoyancy to reach neutral floatation underwater within seconds. This mechanism can promote the replacement of traditional, and physically larger, buoyancy regulation systems such as pistons and pressurized tanks, and enables the miniaturization of autonomous underwater vehicles.

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“…It can remain stable in a fixed vertical position, limited by the diffusion rates of the gas from the surface‐anchored microbubbles into the bulk water and up to few hours. [ 49 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Buoyancy Autoregulationmentioning

confidence: 99%

Backswimmer‐Inspired Miniature 3D‐Printed Robot with Buoyancy Autoregulation through Controlled Nucleation and Release of Microbubbles

Kobo

Pinchasik

2022

Advanced Intelligent Systems

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“…On the other end, a simple exponential distribution, approximated by b = 1 , is expected for systems where a purely stochastic mechanism such as thermal or mechanical fluctuations or hole nucleation is the dominant rupture mechanism (Casteletto et al 2003;Langevin 2020). As shown by Lhuissier and Villermaux (2012) and discussed by Miguet et al (2021), a b = 4∕3 is expected for systems containing impurities in presence of Marangoni recirculation (or to be specific marginal regeneration in their case). Finally, the b ≃ 3.6 corresponds to a symmetric distribution, which so far has been observed for films at finite Ca numbers with simple interfaces whose rupture is controlled by the evolution of spontaneously growing thickness fluctuations .…”

Section: Coalescence Time Distributionsmentioning

confidence: 86%

“…Although coalescence times and film lifetimes are typically reported with large standard deviations, as distributions, or as scattered single data points Dudek et al 2020;Mazutis and Griffiths 2012;Suja et al 2018;Dinh et al 2021;Exerowa et al 1983;Suja et al 2020;Saulnier et al 2014;Miguet et al 2021;Poulain et al 2018;Vitry et al 2019;Tian et al 2022), the origin of this scatter is rarely addressed, mostly because of the difficulties that such a practice entails (i.e., decoupling the scatter due to experimental control, extrinsic factors such as impurities, and intrinsic ones such as thermocapillary waves and surface concentration fluctuations). Here, we will investigate two of the main contributions to the scatter, namely that of extrinsic factors like impurities and variations in the collision angle.…”

Section: Quantifying Scatter In Coalescence Timementioning

confidence: 99%

Studying coalescence at different lengthscales: from films to droplets

et al. 2022

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The hydrodynamics of thin films is an important factor when it comes to the stability and rheology of multiphasic materials, such as foams, emulsions, and polymer blends. However, there have so far been only limited experimental studies addressing the dynamics of individual free-standing thin films at conditions similar to those encountered on macroscopic scales. In this article, we study a well-characterized system of a water-in-oil emulsion stabilized by a non-ionic surfactant (SPAN80) close to its CMC. We employ a dynamic thin film balance, to study the dynamics of freestanding films under both constant and time-varied pressure drops. We compare with the recently published results of Narayan et al. (2020) on colliding droplets of the same system with a hydrodynamic microfluidic trap, and show for the first time that agreement between the two lengthscales is possible, which indicates that the coalescence is indeed dominated by the dynamics in the film. We then address the scatter in the coalescence times and show that it can be affected by extrinsic factors, as well as by variations in the collision angle. Finally, we discuss the difficulties of extracting insight on the coalescence mechanism from coalescence time distributions when different effects such as impurities, small pressure variations, collision angle variations, and possible Marangoni-related instabilities are at play.

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“…Indeed, the film surrounding surface bubbles has been proven to thin down to a few tens of nanometers, the thickness at which bursting occurs. To understand and to be able to predict the lifetime of these bubbles, it is therefore necessary to consider their thinning dynamics [6].…”

Section: Introductionmentioning

confidence: 99%

Impact of physical-chemistry on the film thinning in surface bubbles

Pasquet¹,

Boulogne²,

Saint-Anna³

et al. 2022

Preprint

Self Cite

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In this paper, we investigate the thinning dynamics of evaporating surfactant-stabilised surface bubbles by considering the role of the physical-chemistry of solutions used in the liquid bath. We study the impact of the surfactant concentration below and above the cmc (critical micelle concentration) and the role of ambient humidity. First, in a humidity-saturated atmosphere, we show that if the initial thickness depends on the surfactant concentration and is limited by the surface elasticity, the drainage dynamics are very well described from the capillary and gravity contributions. These dynamics are independent of the surfactant concentration. In a second part, our study reveals that the physical-chemistry impacts the thinning dynamics through evaporation. We include in the model the additional contribution due to evaporation, which shows a good description of the experimental data below the cmc. Above the cmc, although this model is unsatisfactory at short times, the dynamics at long times is correctly rendered and we establish that the increase of the surfactant concentration decreases the impact of evaporation. Finally, the addition of a hygroscopic compound, glycerol, can be also rationalized by our model. We demonstrate that glycerol decreases the bubble thinning rate at ambient humidity, thus increasing their stability.

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The Life of a Surface Bubble

Cited by 21 publications

References 65 publications

Backswimmer‐Inspired Miniature 3D‐Printed Robot with Buoyancy Autoregulation through Controlled Nucleation and Release of Microbubbles

Backswimmer‐Inspired Miniature 3D‐Printed Robot with Buoyancy Autoregulation through Controlled Nucleation and Release of Microbubbles

Studying coalescence at different lengthscales: from films to droplets

Impact of physical-chemistry on the film thinning in surface bubbles

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