Transient deformation dynamics of particle laden droplets in electric field

Mikkelsen, Arne; Rozynek, Zbigniew; Khobaib, Khobaib; Dommersnes, Paul; Fossum, Jon Otto

doi:10.1016/j.colsurfa.2017.05.010

Cited by 12 publications

(9 citation statements)

References 50 publications

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“…Adding particles to the drop surface may alter drop behaviour and characteristics in electric fields. The deformation, [48][49][50] mechanics, 32,51,52 relaxation, 26 or rotation 53 of particle-covered drops can differ from those of a pure drop. The surface particle's size, concentration, and electrical properties can influence the properties of the drop.…”

Section: Behaviour Of Particle-covered Silicone Oil Drops In Electricmentioning

confidence: 99%

Particle-covered drops in electric fields: drop deformation and surface particle organization

et al. 2018

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Drops covered by adsorbed particles are a prominent research topic because they hold promise for a variety of practical applications. Unlocking the enormous potential of particle-laden drops in new material fabrication, for instance, requires understanding how surface particles affect the electrical and deformation properties of drops, as well as developing new routes for particle manipulation at the interface of drops. In this study, we utilized electric fields to experimentally investigate the mechanics of particle-covered silicone oil drops suspended in castor oil, as well as particle assembly at drop surfaces. We used particles with electrical conductivities ranging from insulating polystyrene to highly conductive silver. When subjected to electric fields, drops can change shape, rotate, or break apart. In the first part of this work, we demonstrate how the deformation magnitude and shape of drops, as well as their electrical properties, are affected by electric field strength, particle size, conductivity, and coverage. We also discuss the role of electrohydrodynamic flows on drop deformation. In the second part, we present the electric field-directed assembly and organization of particles at drop surfaces. In this regard, we studied various parameters in detail, including electric field strength, particle size, coverage, and electrical conductivity. Finally, we present a novel method for controlling the local particle coverage and packing of particles on drop surfaces by simply tuning the frequency of the applied electric field. This approach is expected to find uses in optical materials and applications.

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Section: Behaviour Of Particle-covered Silicone Oil Drops In Electricmentioning

confidence: 99%

Particle-covered drops in electric fields: drop deformation and surface particle organization

et al. 2018

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“…A colloidal particle or Pickering droplet is formed when the particle-laden droplet or suspension, for which

, is subjected to an electric field [ 21 , 91 , 92 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 ]. Particles can be trapped at the interface more rapidly under a weak electric field (~ 0.1 kV/mm) and once trapped, they remain there.…”

Section: Particle-covered Dropletsmentioning

confidence: 99%

Electro-Hydrodynamics of Emulsion Droplets: Physical Insights to Applications

et al. 2020

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The field of droplet electrohydrodynamics (EHD) emerged with a seminal work of G.I. Taylor in 1966, who presented the so-called leaky dielectric model (LDM) to predict the droplet shapes undergoing distortions under an electric field. Since then, the droplet EHD has evolved in many ways over the next 55 years with numerous intriguing phenomena reported, such as tip and equatorial streaming, Quincke rotation, double droplet breakup modes, particle assemblies at the emulsion interface, and many more. These phenomena have a potential of vast applications in different areas of science and technology. This paper presents a review of prominent droplet EHD studies pertaining to the essential physical insight of various EHD phenomena. Here, we discuss the dynamics of a single-phase emulsion droplet under weak and strong electric fields. Moreover, the effect of the presence of particles and surfactants at the emulsion interface is covered in detail. Furthermore, the EHD of multi-phase double emulsion droplet is included. We focus on features such as deformation, instabilities, and breakups under varying electrical and physical properties. At the end of the review, we also discuss the potential applications of droplet EHD and various challenges with their future perspectives.

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“…A numerical study by Dong and Sau [16] found an insulting droplet may break into a number of a satellite drops when exposed to electrical field. Ouriemi and Vlahovska [17] and Mikkelsen et al [18] found the electrical field strongly influents the surface-absorbed particles/surfactant distribution on droplet surface under electrical field. The deformed shape may alter the effective thermal conductivity and viscosity, leading to a changed pressure drop and heat transfer coefficient [19,20].…”

Section: Introductionmentioning

confidence: 96%

Shape stability and flow behaviour of a phase change material based slurry in coupled fluid-thermo-electrical fields for electronic device cooling

Mura²,

et al. 2020

Applied Thermal Engineering

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Transient deformation dynamics of particle laden droplets in electric field

Cited by 12 publications

References 50 publications

Particle-covered drops in electric fields: drop deformation and surface particle organization

Particle-covered drops in electric fields: drop deformation and surface particle organization

Electro-Hydrodynamics of Emulsion Droplets: Physical Insights to Applications

Shape stability and flow behaviour of a phase change material based slurry in coupled fluid-thermo-electrical fields for electronic device cooling

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