Self-Induced Surfactant Transport along Discontinuous Liquid–Liquid Interfaces

Sinz, Dkn David; Hanyak, M Myroslava; Darhuber, Anton A.

doi:10.1021/jz400287x

Cited by 13 publications

(8 citation statements)

References 52 publications

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“…These techniques are promising, first of all, from the viewpoint of numerous chemical and biophysical applications among which the most important are microfluidic devices for the production of emulsions (Song, Tice & Ismagilov 2003; Seemann et al. 2012), various biophysical lab-on-chip diagnostic systems (Ju & Warrick 2013; Sinz, Hanyak & Darhuber 2013; Yamada & Ono 2015) and continuous-flow microreactors (Nieves-Remacha, Kulkarni & Jensen 2012; Bratsun et al. 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The last decade has been marked by a rapidly increasing interest in techniques for manipulation of single phase inclusions (droplets, bubbles or particles) in a liquid phase. These techniques are promising, first of all, from the viewpoint of numerous chemical and biophysical applications among which the most important are microfluidic devices for the production of emulsions (Song, Tice & Ismagilov 2003;Seemann et al 2012), various biophysical lab-on-chip diagnostic systems (Ju & Warrick 2013;Sinz, Hanyak & Darhuber 2013;Yamada & Ono 2015) and continuous-flow microreactors (Nieves-Remacha, Kulkarni & Jensen 2012;Bratsun et al 2018). The characteristic size of these devices, which is usually of the order of one millimetre or less, defines spatial scales for mass transfer processes.…”

Section: Introductionmentioning

confidence: 99%

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Phase transitions on partially contaminated surface under the influence of thermocapillary flow

et al. 2019

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We study, both experimentally and theoretically, the fluid flow driven by a thermocapillary effect applied to a partially contaminated interface in a two-dimensional slot of finite extent. The contamination is due to the presence of an insoluble surfactant which is convected by the flow forming a stagnant zone by the colder edge of the interface. The thermocapillary surface stress is produced by a special optocapillary system, which makes it possible, first, to get an almost linear temperature profile along the interface and, second, to apply a surface pressure large enough to force the surfactant to experience a phase transition to a more condensed state. This enabled us for the first time since the release of the paper by Carpenter & Homsy (J. Fluid Mech., vol. 155, 1985, pp. 429–439) to test experimentally their theoretical predictions and obtain new results for the case when the contamination exists simultaneously in two phase states within the interface. We show that one part of the surface is free of surfactant and subject to vigorous thermocapillary flow, while another part is stagnant and subject to creeping flow with a surface velocity which is approximately two orders of magnitude smaller. We found that the extent of the stagnant zone theoretically predicted earlier does not coincide with the newly obtained experimental data. In this paper, we suggest analytical and numerical solutions for the position of the edge of the stagnation zone, which are in perfect agreement with the experimental data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase transitions on partially contaminated surface under the influence of thermocapillary flow

et al. 2019

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“…In the last few years, different types of microreactors and -mixers have been proposed [ 14 , 15 , 16 , 17 ]. Their operation principle relies not only on diffusion, but also on convective mixing.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Micromixer Based on the Solutocapillary Marangoni Effect in a Continuous-Flow Microreactor

et al. 2018

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Continuous-flow microreactors are an important development in chemical engineering technology, since pharmaceutical production needs flexibility in reconfiguring the synthesis system rather than large volumes of product yield. Microreactors of this type have a special vessel, in which the convective vortices are organized to mix the reagents to increase the product output. We propose a new type of micromixer based on the intensive relaxation oscillations induced by a fundamental effect discovered recently. The mechanism of these oscillations was found to be a coupling of the solutal Marangoni effect, buoyancy and diffusion. The phenomenon can be observed in the vicinity of an air–liquid (or liquid–liquid) interface with inhomogeneous concentration of a surface-active solute. Important features of the oscillations are demonstrated experimentally and numerically. The periodicity of the oscillations is a result of the repeated regeneration of the Marangoni driving force. This feature is used in our design of a micromixer with a single air bubble inside the reaction zone. We show that the micromixer does not consume external energy and adapts to the medium state due to feedback. It switches on automatically each time when a concentration inhomogeneity in the reaction zone occurs, and stops mixing when the solution becomes sufficiently uniform.

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“…In the above cases, Marangoni convection spontaneously occurs due to the interfacial mass transfer of surface‐active substances. Other works attempt to specifically introduce fluidic interfaces in capillary reactors to create a Marangoni‐based micromixer .…”

Section: Introductionmentioning

confidence: 99%

Meniscus Asymmetry and Chemo‐Marangoni Convection in Capillaries

et al. 2017

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Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthdayA liquid-liquid system inside a capillary in which an interfacial reaction leads to in situ production of a surfactant was studied experimentally. The resulting chemo-Marangoni convection induces periodic spreading-dewetting cycles in laboratory experiments. By selected experiments in microgravity, the individual phenomena of the system dynamics could be isolated. The spreading-dewetting cycles result from a complex interplay between the decrease in interfacial tension due to the production of surfactant, the chemo-Marangoni convection, and the gravity-driven deformation of the meniscus shape.

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Self-Induced Surfactant Transport along Discontinuous Liquid–Liquid Interfaces

Cited by 13 publications

References 52 publications

Phase transitions on partially contaminated surface under the influence of thermocapillary flow

Phase transitions on partially contaminated surface under the influence of thermocapillary flow

Adaptive Micromixer Based on the Solutocapillary Marangoni Effect in a Continuous-Flow Microreactor

Meniscus Asymmetry and Chemo‐Marangoni Convection in Capillaries

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