Self-Propulsion of Liquid Marbles: Leidenfrost-like Levitation Driven by Marangoni Flow

Bormashenko, Edward; Bormashenko, Yelena; Grynyov, Roman; Aharoni, Hadas; Whyman, Gene; Binks, Bernard P.

doi:10.1021/acs.jpcc.5b01307

Cited by 130 publications

(161 citation statements)

References 52 publications

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“…Furthermore, surface texture affects the Leidenfrost effect (water droplets levitating over a hot surface due to the presence of an evaporating vapour film). A similar Leidenfrost-like selfpropulsion was also found in liquid marbles with alcohol water solution [31]. The value of the critical temperature at which such effect occurs can be lowered significantly when micro-textured superhydrophobic pattern is applied.…”

Section: Effect Of Surface Patterns On Wettingsupporting

confidence: 66%

Why re-entrant surface topography is needed for robust oleophobicity

Nosonovsky

Bhushan

2016

Phil. Trans. R. Soc. A.

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Surface patterns affect wetting properties of solid materials allowing manipulation of the phase state of an adjacent fluid. The best known example of this effect is the superhydrophobic composite (Cassie-Baxter) interface with vapour/air pockets between the solid and liquid. Mathematically, the effect of surface micropatterns can be studied by an averaging technique similarly to the method of separation of motions in dynamics. However, averaged parameters are insufficient for robust superhydrophobic and superoleophobic surfaces because additional topography features are important: hierarchical organization and re-entrant roughness. The latter is crucial for the oleophobicity because it enhances the stability of a composite interface. The re-entrant topography can be achieved by various methods. Understanding the role of re-entrant surface topography gives us new insights on the multitude of wetting scenarios beyond the standard Wenzel and Cassie-Baxter models.This article is part of the themed issue 'Bioinspired hierarchically structured surfaces for green science'.

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Section: Effect Of Surface Patterns On Wettingsupporting

confidence: 66%

Why re-entrant surface topography is needed for robust oleophobicity

Nosonovsky

Bhushan

2016

Phil. Trans. R. Soc. A.

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“…Although the motion of afloating entity in the direction of aM arangoni flow is commonly observed, [26][27][28][29] the opposite behavior has been rarely described. [30] When we used agelled liquid marble,w eo bserved as imilar behavior,s howing that anti-Marangoni motion was not due to flow inside the marble (see Te xt S2 in the Supporting Information).…”

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confidence: 99%

Light‐Driven Transport of a Liquid Marble with and against Surface Flows

et al. 2016

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Liquid marbles, that is, liquid drops coated by a hydrophobic powder, do not wet any solid or liquid substrate, making their transport and manipulation both highly desirable and challenging. Herein, we describe the light-driven transport of floating liquid marbles and emphasize a surprising motion behavior. Liquid marbles are deposited on a water solution containing photosensitive surfactants. Irradiation of the solution generates photoreversible Marangoni flows that transport the liquid marbles toward UV light and away from blue light when the thickness of the liquid substrate is large enough (Marangoni regime). Below a critical thickness, the liquid marbles move in the opposite direction to that of the surface flow at a speed increasing with decreasing liquid thickness (anti-Marangoni). We demonstrate that the anti-Marangoni motion is driven by the free surface deformation, which propels the non-wetting marble against the surface flow. We call this behavior "slide effect".

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“…A liquid marble is a liquid droplet coated with hydrophobic powder, which can roll on a solid surface12345 and float on a liquid surface due to its non-wetting coating678910111213141516. A liquid marble can be driven across a liquid surface using thermocapillarity1718.…”

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confidence: 99%

“…Recently, Bormashenko et al . demonstrated that a floating liquid marble can propel itself across the water surface due to the Marangoni solutocapillary effect16. Self-propulsion provides a means of transport for a small volume of an aqueous solution.…”

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confidence: 99%

Measuring the Coefficient of Friction of a Small Floating Liquid Marble

Ooi

Nguyen

Evans

et al. 2016

Sci Rep

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This paper investigates the friction coefficient of a moving liquid marble, a small liquid droplet coated with hydrophobic powder and floating on another liquid surface. A floating marble can easily move across water surface due to the low friction, allowing for the transport of aqueous solutions with minimal energy input. However, the motion of a floating marble has yet to be systematically characterised due to the lack of insight into key parameters such as the coefficient of friction between the floating marble and the carrier liquid. We measured the coefficient of friction of a small floating marble using a novel experimental setup that exploits the non-wetting properties of a liquid marble. A floating liquid marble pair containing a minute amount magnetite particles were immobilised and then released in a controlled manner using permanent magnets. The capillarity-driven motion was analysed to determine the coefficient of friction of the liquid marbles. The “capillary charge” model was used to fit the experimental results. We varied the marble content and carrier liquid to establish a relationship between the friction correction factor and the meniscus angle.

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Self-Propulsion of Liquid Marbles: Leidenfrost-like Levitation Driven by Marangoni Flow

Cited by 130 publications

References 52 publications

Why re-entrant surface topography is needed for robust oleophobicity

Why re-entrant surface topography is needed for robust oleophobicity

Light‐Driven Transport of a Liquid Marble with and against Surface Flows

Measuring the Coefficient of Friction of a Small Floating Liquid Marble

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