Effect of parameters on redistribution and removal of particles from drop surfaces

Nudurupati, Sai; Janjua, Muhammad Mansoor; Singh, Pushpendra; Aubry, Nadine

doi:10.1039/b912723b

Cited by 23 publications

(18 citation statements)

References 41 publications

(51 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other researchers have demonstrated that surface particles can be transported towards drop poles and agglomerate there via dielectrophoresis. 15,42 However, according to our theoretical calculations, this could not have been the case here. We found that for all the different particles utilized in the experiments (except PS0), the dielectrophoretic (DEP) force on the particles was directed towards the drop equator rather than towards the drop poles.…”

Section: Particle Structuring At Drop Interfacesmentioning

confidence: 58%

“…20 Particles that are similar except for their dielectric properties may be transported either to the electric poles or electric equator of the drop by dielectrophoretics. 42 These examples demonstrate the importance of the electrical properties of surface particles for particle assembly. Besides their electrical properties, we also investigated the influence of particle coverage and particle size on their organization at drop interfaces.…”

Section: Assembly Of Surface Particles and Their Active Structuringmentioning

confidence: 95%

“…Electrohydrodynamic (EHD) liquid flows, 37,38 dipolar interactions, 39 dielectrophoresis (DEP), 40,41 electrostatics, 36 or electrocoalescence 19 can be utilized to transport, assemble, or sort particles at drop interfaces. Removing particles from a drop is also possible through tip-streaming mechanisms 42 and strong EHD flows. 14 The applicability of the abovementioned approaches depends on the electric properties of both the particles and the liquids.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2018

View full text Add to dashboard Cite

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.

show abstract

Section: Particle Structuring At Drop Interfacesmentioning

confidence: 58%

Section: Assembly Of Surface Particles and Their Active Structuringmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The EHD pre-structuring of particles into ordered ribbons is central in our method and ensures packed and sharply defined Janus and patchy capsules immediately after drop coalescence. Our method is distinctly different from previous work reported in the literature, where electro-coalescence has been used to merge drops containing different particles, which subsequently have been positioned by dielectrophoresis to make partly covered Janus drops rather than fully covered Janus capsules39.…”

Section: Discussionmentioning

confidence: 74%

Electroformation of Janus and patchy capsules

et al. 2014

View full text Add to dashboard Cite

Janus and patchy particles have designed heterogeneous surfaces that consist of two or several patches with different materials properties. These particles are emerging as building blocks for a new class of soft matter and functional materials. Here we introduce a route for forming heterogeneous capsules by producing highly ordered jammed colloidal shells of various shapes with domains of controlled size and composition. These structures combine the functionalities offered by Janus or patchy particles, and those given by permeable shells such as colloidosomes. The simple assembly route involves the synergetic action of electro-hydrodynamic flow and electro-coalescence. We demonstrate that the method is robust and straightforwardly extendable to production of multi-patchy capsules. This forms a starting point for producing patchy colloidosomes with domains of anisotropic chemical surface properties, permeability or mixed liquid–solid phase domains, which could be exploited to produce functional emulsions, light and hollow supra-colloidosome structures, or scaffolds.

show abstract

“…The behaviour of particle-covered drops in electric field has received surprisingly little attention despite some intriguing reports about particle redistribution along the drop interface in uniform AC fields (Nudurupati et al 2008(Nudurupati et al , 2009(Nudurupati et al , 2010 or structuring in uniform DC fields (Dommersnes et al 2013). The latter study showed that in the case RS < 1, particles initially randomly distributed at the surface (figure 1d), form a Electrohydrodynamics of particle-covered drops (a,d) In the absence of electric field, the drop is spherical and particle distribution is random.…”

Section: Introductionmentioning

confidence: 99%

Electrohydrodynamics of particle-covered drops

Ouriemi

Vlahovska

2014

J. Fluid Mech.

View full text Add to dashboard Cite

We experimentally investigate the effect of surface-absorbed colloidal particles on the dynamics of a leaky dielectric drop in a uniform DC electric field. Depending on the particle polarizabilty, coverage and the electrical field intensity, particles assemble into various patterns such as an equatorial belt, pole-to-pole chains or a band of dynamic vortices. The particle structuring changes droplet electrohydrodynamics: under the same conditions where a particle-free drop would be a steady oblate spheroid, the belt can give rise to unsteady behaviours such as sustained drop wobbling or tumbling. Moreover, particle chaining can be accompanied by prolate drop deformation and tip-streaming.

show abstract

Effect of parameters on redistribution and removal of particles from drop surfaces

Cited by 23 publications

References 41 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

Electroformation of Janus and patchy capsules

Electrohydrodynamics of particle-covered drops

Contact Info

Product

Resources

About