Electric Field Driven Addressing of Oil-in-Water Droplets in the Presence of Gradients of Ionic and Nonionic Surfactants

Tuček, Jakub; Beránek, Pavel; Vobecká, Lucie; Slouka, Zdeněk; Přibyl, Michal

doi:10.1109/tia.2016.2563391

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…As was alluded to in the previous section, there are a large variety of parameters that have an influence on the EP mobility of droplets. These parameters include the surface charge of the droplet [36, 76, 87, 88], pH [89], internal flow in the droplets [41, 44, 65, 78], the viscosity ratio of the dispersed and continuous phase [44, 57], droplet size, surface charge of the channel wall [44, 90], electric field strength, [73, 91–93], as well as the boundary effects [44]. A generalized summary of the effect of these parameters on the droplet EP mobility and velocity is shown in Table 1, together with potential methods to measure these parameters.…”

Section: Parameters Influencing Droplet Ep Mobilitymentioning

confidence: 99%

“…The surface charge of a droplet can be measured using standardized

ζ

‐potential measurements. The surfactant type in the system [76, 88], or the nature of the interface‐stabilizing nanoparticles [94, 95], pH [12, 38, 87], and ionic strength of the solution [96, 97] are contributing factors to the apparent surface charge or

ζ

‐potential at the droplet interface.…”

Section: Parameters Influencing Droplet Ep Mobilitymentioning

confidence: 99%

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Mechanistic studies of droplet electrophoresis: A review

2021

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Electrophoresis (EP) of droplets is an intriguing phenomenon that has applications in biological systems, separation strategies, and reactor engineering. Droplet EP is significantly different from the classic particle EP because of droplet characteristics such as a mobile surface charge and the nonrigidity of the interface. Also, the liquid–liquid system, where there is an interplay between the hydrodynamic and electrokinetic forces in both phases, adds to the complexity of electrophoretic motion. Due to the vast amount of potential applications of droplet EP, a mechanistic understanding of the droplet motion in the presence of an external electric field is crucial. This review provides a background on the mechanism of droplet EP and summarizes the intrinsic interplay between the different relevant forces in these systems. The review also describes the key differences between droplet EP and particle EP, and the impact of these differences on droplet mobility. Additionally, we schematically summarize the effects of key parameters on droplet EP mobility, such as electric double layer polarization, the development of internal flow inside a droplet and boundary effects.

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Section: Parameters Influencing Droplet Ep Mobilitymentioning

confidence: 99%

“…The surface charge of a droplet can be measured using standardized

ζ

ζ

‐potential at the droplet interface.…”

Section: Parameters Influencing Droplet Ep Mobilitymentioning

confidence: 99%

Mechanistic studies of droplet electrophoresis: A review

2021

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“…Tuček et al reported electric-field-controlled kerosenedroplet transport on a water surface containing surfactants. [63] Controlling the concentration gradients of the ionic surfactants by an electric field was critical in the transport process. The kerosene droplet was pushed away from the direction of the surfactant reservoir owing to Marangoni flow, which is different from classical electrophoretic migration.…”

Section: Electric-field-induced Directional Liquid Motionmentioning

confidence: 99%

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Zhang

et al. 2017

Advanced Materials

103

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External‐field‐responsive liquid transport has received extensive research interest owing to its important applications in microfluidic devices, biological medical, liquid printing, separation, and so forth. To realize different levels of liquid transport on surfaces, the balance of the dynamic competing processes of gradient wetting and dewetting should be controlled to achieve good directionality, confined range, and selectivity of liquid wetting. Here, the recent progress in external‐field‐induced gradient wetting is summarized for controllable liquid transport from movement on the surface to penetration into the surface, particularly for liquid motion on, patterned wetting into, and permeation through films on superwetting surfaces with external field cooperation (e.g., light, electric fields, magnetic fields, temperature, pH, gas, solvent, and their combinations). The selected topics of external‐field‐induced liquid transport on the different levels of surfaces include directional liquid motion on the surface based on the wettability gradient under an external field, partial entry of a liquid into the surface to achieve patterned surface wettability for printing, and liquid‐selective permeation of the film for separation. The future prospects of external‐field‐responsive liquid transport are also discussed.

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“…We recently avoided this problem by employing dc electric field to gradually release ionic surfactants from a reservoir into a system, in which no surfactant molecules are initially present. In that study, a dielectric droplet was placed on the surface of DI water . The released molecules of surfactants formed a gradient of surface tension, which was successfully used for controlled displacement of dielectric droplets.…”

Section: Introductionmentioning

confidence: 99%

Electric field assisted transport of dielectric droplets dispersed in aqueous solutions of ionic surfactants

Tuček¹,

Slouka²,

Přibyl³

2018

Electrophoresis

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Motion of liquid droplets with a surface electric charge can be efficiently controlled by dc electric field. Here, we show that the surface of a dielectric kerosene droplet can be charged by the addition of ionic surfactants to a surrounding aqueous electrolyte. The direction of droplet motion is determined by the polarity of the surfactant charge and the orientation of the imposed electric field. We have found that the effective electrophoretic mobility of dielectric droplets in a confined channel is directly proportional to the logarithm of the surfactant concentration even for values significantly exceeding critical micelle concentration (CMC). We attribute this finding not only to adsorption of ionic surfactants to the surface of dielectric droplets but also to the weakening of electro-osmosis at channel walls due to the increase of ionic strength in the aqueous phase. Our findings can be exploited in microfluidic reactors and separators for on request dosing, sampling, and separation of dielectric fluids.

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Electric Field Driven Addressing of Oil-in-Water Droplets in the Presence of Gradients of Ionic and Nonionic Surfactants

Cited by 10 publications

References 33 publications

Mechanistic studies of droplet electrophoresis: A review

Mechanistic studies of droplet electrophoresis: A review

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Electric field assisted transport of dielectric droplets dispersed in aqueous solutions of ionic surfactants

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