Liquid marbles: topical context within soft matter and recent progress

McHale, Glen; Newton, Michael I.

doi:10.1039/c5sm00084j

Cited by 221 publications

(200 citation statements)

References 144 publications

(169 reference statements)

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“…[1][2][3][4][5] The formed particle shell prevents direct contact of the liquid with a solid substrate, thus reducing significantly the surface friction of the liquid marble on it. 3 Liquid marbles are therefore excellent micro-reservoirs, which can be easily transported without any leakage of the enwrapped liquid.…”

Section: Introductionmentioning

confidence: 99%

Switchable Opening and Closing of a Liquid Marble via Ultrasonic Levitation

Zang¹,

Li²,

Chen³

et al. 2015

Langmuir

109

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Liquid marbles have promising applications in the field of microreactors, where the opening and closing of their surfaces plays a central role. We have levitated liquid water marbles using an acoustic levitator and, thereby, achieved the manipulation of the particle shell in a controlled manner. Upon increasing the sound intensity, the stable levitated liquid marble changes from a quasi-sphere to a flattened ellipsoid. Interestingly, a cavity on the particle shell can be produced on the polar areas, which can be completely healed when decreasing the sound intensity, allowing it to serve as a microreactor. The integral of the acoustic radiation pressure on the part of the particle surface protruding into air is responsible for particle migration from the center of the liquid marble to the edge. Our results demonstrate that the opening and closing of the liquid marble particle shell can be conveniently achieved via acoustic levitation, opening up a new possibility to manipulate liquid marbles coated with non-ferromagnetic particles.

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Section: Introductionmentioning

confidence: 99%

Switchable Opening and Closing of a Liquid Marble via Ultrasonic Levitation

Zang¹,

Li²,

Chen³

et al. 2015

Langmuir

109

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“…Development of such vehicles for controlled delivery could benefit from a clearer understanding of the nature and magnitude of restoring forces that result from the displacement of a particle, when it is disturbed from its equilibrium position on an interface. Control of the particle adsorption or detachment is important in liquid marbles which have promising applications in micro-chemical and bioreactors [20][21][22] and tuning droplet impact dynamics 23 .…”

Section: Introductionmentioning

confidence: 99%

Detachment force of particles from fluid droplets

Ettelaie

Lishchuk

2015

Soft Matter

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We calculate the deformation of a spherical droplet, resulting from the application of a pair of opposite forces to particles located diametrically opposite at the two ends of the droplet. The free-energy analysis is used to calculate the force-distance curves for the generated restoring forces, arising from the displacement of the particles relative to each other. While the logarithmic dependence of the "de Gennes-Hooke" constant on the particle to droplet size ratio, ν, is rather well known in the limit of very small ν, we find that for more realistic particle to droplet size ratios, i.e. ν = 0.001 to 0.01, the additional constant terms of O(1) constitute a significant correction to previously reported results. We derive the restoring force constant to be 2πγ [0.5 − ln(ν/2)] −1 , in perfect agreement with the exact semi-numerical analysis of the same problem. The deviation from the linear force-displacement behaviour, occurring close to the point of detachment, is also investigated. A study of the energy dissipated shows it to be an increasingly dominant component of the work done during the detachment of the particles, as ν decreases. This indicates the existence of a significantly higher energy barrier to desorption of very small particles, compared to the one suggested by their adsorption energy alone.

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“…This phenomena, known as the Leidenfrost effect [2], has been studied extensively for rigid solid surfaces [3][4][5]. Recently, there has been a strong resurgence in interest in the topic, which can be viewed as an example of perfect superhydrophobicity since a levitating droplet can be viewed in some respects as a droplet on a surface with a contact angle of 180 o [5][6][7]. Examples of recent reports include Leidenfrostinduced drag reduction [8], ratcheted surfaces for droplet self-propulsion [9][10][11][12][13][14], stabilisation of Leidenfrost vapour layers by superhydrophobic surfaces [15] and a sublimation heat engine [16].…”

Section: Introductionmentioning

confidence: 99%

Leidenfrost transition temperature for stainless steel meshes

Geraldi

McHale

et al. 2016

Materials Letters

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(2016) 'Leidenfrost transition temperature for stainless steel meshes. ', Materials letters., Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractOn surfaces well above 100°C water does not simply boil away. When there is a sufficient heat transfer between the solid and the liquid a continuous vapour layer instantaneous forms under a droplet of water and the drop sits on a cushion of vapour, highly mobile and insulated from the solid surface. This is known as the Leidenfrost effect and the temperature at which this occurs if known as the Leidenfrost transition temperature. In this report, an investigation of discontinuous surfaces, stainless steel meshes, have been tested to determine the effect of the woven material on the Leidenfrost phenomenon. . This allows suppression of the Leidenfrost effect as it can be increase to over 300°C from 185°C for a stainless steel surface. Graphical Abstract Introduction

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Liquid marbles: topical context within soft matter and recent progress

Cited by 221 publications

References 144 publications

Switchable Opening and Closing of a Liquid Marble via Ultrasonic Levitation

Switchable Opening and Closing of a Liquid Marble via Ultrasonic Levitation

Detachment force of particles from fluid droplets

Leidenfrost transition temperature for stainless steel meshes

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