Electro-Hydrodynamics of Emulsion Droplets: Physical Insights to Applications

Abbasi, Muhammad Salman; Song, Ryungeun; Cho, Seongsu; Lee, Jinkee

doi:10.3390/mi11100942

Cited by 27 publications

(13 citation statements)

References 168 publications

(302 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…7A). [91][92][93] The deformation of a multi-phase emulsion droplet could be described in the same way as that of a single emulsion droplet. For example, under a weak electric eld, the spherical double emulsion droplet is deformed into PR-PR, PR-OB, OB-PR, and OB-OB (inner-outer interface; PR stands for prolate and OB stands for oblate) according to the R/S across each interface.…”

Section: Electrical Methods For Manipulating Microdropletsmentioning

confidence: 99%

From shaping to functionalization of micro-droplets and particles

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Electrical Methods For Manipulating Microdropletsmentioning

confidence: 99%

From shaping to functionalization of micro-droplets and particles

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although quite a few numerical, experimental and analytical studies have been conducted in the recent past to understand the physics of the behaviour of droplets under an electric field (Chen et al 2019;Lu et al 2019;Abbasi et al 2020;Huang et al 2020a,b;Chirkov, Dobrovolskii & Vasilkov 2021;Das & Saintillan 2021;Li et al 2021b;Li et al 2021a;Ou et al 2022) there have been very few studies which addressed the interaction of unequal sized droplets under a uniform electric field (Anand et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…2019; Abbasi et al. 2020; Huang et al. 2020 a , b ; Chirkov, Dobrovolskii & Vasilkov 2021; Das & Saintillan 2021; Li et al.…”

Section: Introductionunclassified

See 1 more Smart Citation

Dynamics of non-coalescence in unequal sized, conducting multi-droplet system suspended in an insulating medium under an electric field

Roy

Anand²,

Thaokar³

2022

J. Fluid Mech.

View full text Add to dashboard Cite

An intriguing experimental observation in electrocoalescence of water-in-oil emulsions is the occurrence of a very low critical electric field, beyond which chaining of droplets and shorting of electrodes is observed, as compared with the experimental and theoretical predictions based on two equal sized water droplets in oil. Motivated by these observations, a numerical, analytical and experimental study on the interaction between multiple, unequal sized, perfectly conducting droplets in a perfectly dielectric medium under an electric field is presented here. We show that the critical capillary number ( $Ca_c$ ), based on the bigger droplet, in a two droplet system, reduces as the radius ratio of the smaller to bigger drop decreases. Secondly, in a system of three equally sized droplets, it is expected that the $Ca_c$ will be smaller than a two equal sized droplet system, since the electric field experienced by the central droplet is higher when surrounded by two droplets instead of one. Our results show that nonlinearity in the system due to both the asymmetric shape deformation and the electrostatic interaction between the multiple droplets, leads to significant reduction in $Ca_c$ for onset of non-coalescence in an unequal sized two droplet system or for equal and unequal sized three droplet systems, as compared with $Ca_c$ for two equal sized droplets. This is possibly one of the underlying mechanisms for observing much smaller $Ca_c$ in emulsions as compared with a system of two equal sized droplets, and could be responsible for a polydisperse water-in-oil emulsion being exceptionally susceptible to chaining under an electric field.

show abstract

“…By exploiting electrical polarization at immiscible liquid/liquid interfaces, external electric fields have been applied to actuate the fusion of isotropic single‐emulsion (SE) drops [30,31]. However, this approach demands rigorously controlled the synchronization of the adjacent droplet phases for coalescence to evade the unexpected fusion of multiple drops that occurs occasionally [32].…”

Section: Introductionmentioning

confidence: 99%

Numerical characterization of inter‐core coalescence by AC dielectrophoresis in double‐emulsion droplets

Tao

Liu

et al. 2022

Electrophoresis

View full text Add to dashboard Cite

The utilization of an alternating current electric field provides a good means to achieve controlled coalescence between paired inner cores encapsulated in water-in-oil-in-water double-emulsion (DE) droplets. Although previous studies have experimentally determined the conditions under which inter-core electrokinetic fusion occurs, the transient interfacial dielectrophoretic (DEP) dynamics key to understand the underlying fluid mechanics is still unclear from a physical point of view. By coupling DEP motion of two-phase flow to phase-field formulation, bulk-coupled numerical simulations are conducted to characterize the spatial-temporal evolution of the surface charge wave and the resulting nonlinear electrical force induced at both the core/shell and medium/shell oil/water interfaces. The effect of interfacial charge relaxation and droplet geometry on inter-core attractive dipolar interaction is investigated within a wide parametric space, and four distinct device operation modes, including normal inter-core fusion, shell elongation, partial core leakage, and complete core release, are well distinguished from one another by flow regime argumentation. Our results herein reveal for the first time the hitherto unknown transient electrohydrodynamic fluid motion of DE droplet driven by Maxwell-Wagner structural polarization. The dynamic simulation method proposed in present study points out an effective outlet to predict the nonlinear electrokinetic behavior of multicore DE droplets for realizing a more controlled triggering of microscale reactions for a wide range of applications in drug discovery, skin care, and food industry.

show abstract

Electro-Hydrodynamics of Emulsion Droplets: Physical Insights to Applications

Cited by 27 publications

References 168 publications

From shaping to functionalization of micro-droplets and particles

From shaping to functionalization of micro-droplets and particles

Dynamics of non-coalescence in unequal sized, conducting multi-droplet system suspended in an insulating medium under an electric field

Numerical characterization of inter‐core coalescence by AC dielectrophoresis in double‐emulsion droplets

Contact Info

Product

Resources

About