Conformal coating of particles in microchannels by magnetic forcing

Tsai, Scott S. H.; Wexler, Jason; Wan, Jiandi; Stone, Howard A.

doi:10.1063/1.3652772

Cited by 61 publications

(62 citation statements)

References 18 publications

(17 reference statements)

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“…Finally, when a particle approaches a fluid interface in such a way that the capillary number (the ratio between viscous and surfacetension forces) is no longer small, the particle may penetrate the interface while being engulfed by the phase it originated from, i.e. without a three-phase contact line being formed [25,26]. Therefore, for an analysis of the forces required to let a particle penetrate the liquid/liquid interface, it is important to discriminate whether the glass spheres are suspended above the interface or actually get adsorbed.…”

Section: Suspended Vs Adsorbed Particlesmentioning

confidence: 99%

Detachment of particles and particle clusters from liquid/liquid interfaces

Sinn

Alishahi

Hardt

2015

Journal of Colloid and Interface Science

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Section: Suspended Vs Adsorbed Particlesmentioning

confidence: 99%

Detachment of particles and particle clusters from liquid/liquid interfaces

Sinn

Alishahi

Hardt

2015

Journal of Colloid and Interface Science

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“…Similar configurations are found in geophysical problems where fluids undergo natural discontinuous density and/or viscosity stratification, such as the ascent of plumes through the Earth's mantle (Manga, Stone & O'Connell 1993). In microfluidics, two-layer fluid systems may be used to coat paramagnetic drops or particles with a shell made of the lower fluid, buoyancy then being replaced by a magnetic force (Tsai et al 2011).…”

Section: Introductionmentioning

confidence: 95%

Inertial dynamics of air bubbles crossing a horizontal fluid–fluid interface

et al. 2012

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The dynamics of isolated air bubbles crossing the horizontal interface separating two Newtonian immiscible liquids initially at rest are studied both experimentally and computationally. High-speed video imaging is used to obtain a detailed evolution of the various interfaces involved in the system. The size of the bubbles and the viscosity contrast between the two liquids are varied by more than one and four orders of magnitude, respectively, making it possible to obtain bubble shapes ranging from spherical to toroidal. A variety of flow regimes is observed, including that of small bubbles remaining trapped at the fluid-fluid interface in a film-drainage configuration. In most cases, the bubble succeeds in crossing the interface without being stopped near its undisturbed position and, during a certain period of time, tows a significant column of lower fluid which sometimes exhibits a complex dynamics as it lengthens in the upper fluid. Direct numerical simulations of several selected experimental situations are performed with a code employing a volume-of-fluid type formulation of the incompressible Navier-Stokes equations. Comparisons between experimental and numerical results confirm the reliability of the computational approach in most situations but also points out the need for improvements to capture some subtle but important physical processes, most notably those related to film drainage. Influence of the physical parameters highlighted by experiments and computations, especially that of the density and viscosity contrasts between the two fluids and of the various interfacial tensions, is discussed and analysed in the light of simple models and available theories.

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“…Prior work on fiber wetting or coating is limited to circular cross sections [37,38]. Similarly, the understanding of noncircular shapes can be applied to the coating of nonspherical magnetic particles that are typically synthesized using microfluidic techniques [39,40]. Finally, since our method can be modeled through geometric calculations, it can be a good model system for fundamental studies of multiphase flows and wetting.…”

Section: Discussionmentioning

confidence: 99%

Creating Isolated Liquid Compartments Using Photopatterned Obstacles in Microfluidics

et al. 2017

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We propose a method to trap liquid (both oil and water) in a microchannel by sequentially injecting oil and water (or vice versa) over photopatterned obstacles with controlled wetting properties. We present a simple geometrical model to understand the liquid-entrapment process and predict the evolution of the water/oil interface over an obstacle. Our analysis provides an analytic solution that can successfully predict useful properties such as angular position of pinch-off and the amount of captured liquid. We show that we are able to obtain a liquid bridge over two circular obstacles, and we are also able to predict the condition for the formation of a bridge. We further demonstrate the effect of the obstacle shape and how a sudden change in gradient results in larger liquid entrapment. We also demonstrate the ability to entrap isolated liquid chambers for parallel experimentation.

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Conformal coating of particles in microchannels by magnetic forcing

Cited by 61 publications

References 18 publications

Detachment of particles and particle clusters from liquid/liquid interfaces

Detachment of particles and particle clusters from liquid/liquid interfaces

Inertial dynamics of air bubbles crossing a horizontal fluid–fluid interface

Creating Isolated Liquid Compartments Using Photopatterned Obstacles in Microfluidics

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