Wetting morphologies on an array of fibers of different radii

Sauret, Alban; Boulogne, François; Cébron, David; Dressaire, Emilie; Stone, Howard A.

doi:10.1039/c5sm00401b

Cited by 32 publications

(24 citation statements)

References 48 publications

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“…Because of challenges in visualizing the microstructures, fibrous media are complex arrays of fibers that are difficult to study experimentally. Therefore seminal work has focused on the simplest element of an array of fibers: a pair of straight parallel fibers [22,23]. These studies have identified two liquid morphologies.…”

Section: éTalement Depuis Un Réservoir 69mentioning

confidence: 99%

Wetting morphologies on randomly oriented fibers

et al. 2015

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We characterize the different morphologies adopted by a drop of liquid placed on two randomly oriented fibers, which is a first step toward understanding the wetting of fibrous networks. The present work reviews previous modeling for parallel and touching crossed fibers and extends it to an arbitrary orientation of the fibers characterized by the tilting angle and the minimum spacing distance. Depending on the volume of liquid, the spacing distance between fibers and the angle between the fibers, we highlight that the liquid can adopt three different equilibrium morphologies: 1) a column morphology in which the liquid spreads between the fibers, 2) a mixed morphology where a drop grows at one end of the column or 3) a single drop located at the node. We capture the different morphologies observed using an analytical model that predicts the equilibrium configuration of the liquid based on the geometry of the fibers and the volume of liquid.

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Section: éTalement Depuis Un Réservoir 69mentioning

confidence: 99%

Wetting morphologies on randomly oriented fibers

et al. 2015

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“…We believe our results will be useful for research in oil recovery, soil remediation, diagnostics, and liquid-infused surfaces. Our study can also be useful in fiber coating and printing applications where the shape of fibers and printing grooves can influence the physical process [21][22][23][24][25]. Last, we hope our results will help researchers building models for porous media flows to incorporate the effect of surface shape.…”

Section: Introductionmentioning

confidence: 77%

Controlled liquid entrapment over patterned sidewalls in confined geometries

2017

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Liquid entrapment over patterned surfaces has applications in diagnostics, oil recovery, and printing processes. Here we study the process of oil displacement upon sequential injection of water over a photopatterned structure in a confined geometry. By varying the amplitude and frequency of triangular and sinusoidal patterns, we are able to completely remove oil or trap oil in varying amounts. We present a theoretical model based on geometrical arguments that successfully predicts the criterion for liquid entrapment and provides insights into the parameters that govern the physical process.

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“…Our work can also have implications in fiber coating where one can envision an obstacle as representing the cross section of a fiber. 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].…”

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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Wetting morphologies on an array of fibers of different radii

Cited by 32 publications

References 48 publications

Wetting morphologies on randomly oriented fibers

Wetting morphologies on randomly oriented fibers

Controlled liquid entrapment over patterned sidewalls in confined geometries

Creating Isolated Liquid Compartments Using Photopatterned Obstacles in Microfluidics

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