Deformation of an elastic substrate due to a sessile drop

Flotation of small solid objects and liquid droplets on water is critical to natural and industrial activities. This paper reports the floating mechanism of liquid marbles, or liquid droplets coated with hydrophobic microparticles. We used X-ray computed tomography (XCT) to acquire cross-sectional images of the floating liquid marble and interface between the different phases. We then analysed the shape of the liquid marble and the angles at the three-phase contact line (TPCL). We found that the small floating liquid marbles follow the mechanism governing the flotation of solid objects in terms of surface tension forces. However, the contact angles formed and deformation of the liquid marble resemble that of a sessile liquid droplet on a thin, elastic solid. For small liquid marbles, the contact angle varies with volume due to the deformability of the interface.

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“…1A ), three fluids 14 15 16 17 18 ( Fig. 1B ) and more recently two fluids and a deformable solid base 19 20 21 22 23 ( Fig. 1C ).…”

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confidence: 97%

Floating mechanism of a small liquid marble

Ooi

Plackowski

Nguyen

et al. 2016

Sci Rep

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“…Interesting phenomena occur at the contact line where the fluid interface meets the solid surface. For example, the substrate can be deformed by the capillary force of the drop, resulting in a wetting ridge (Shanahan 1987b;Carré, Gastel & Shanahan 1996;Pericet-Cámara et al 2008;Das et al 2011;Jerison et al 2011;Limat 2012;Style et al 2013;Hui & Jagota 2014;Pozrikidis & Hill 2014;Bardall, Daniels & Shearer 2018); the contact angle of the fluid interface may violate the classical Young-Dupré equation (Shanahan 1987b;Style & Dufresne 2012;Style et al 2013). The deformation of the substrate also affects the contact line dynamics (Shanahan 1988;Carré et al 1996;Extrand & Kumagai 1996;Kajiya et al 2013;Karpitschka et al 2015;Howland et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…2011; Limat 2012; Style et al. 2013; Hui & Jagota 2014; Pozrikidis & Hill 2014; Bardall, Daniels & Shearer 2018); the contact angle of the fluid interface may violate the classical Young–Dupré equation (Shanahan 1987 b ; Style & Dufresne 2012; Style et al. 2013).…”

Section: Introductionmentioning

confidence: 99%

Modelling moving contact lines on inextensible elastic sheets in two dimensions

2023

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Elastocapillarity has attracted increasing interest in recent years due to its important roles in many industrial applications. In this work, we derive a thermodynamically consistent continuum model for the dynamics of two immiscible fluids on a thin and inextensible elastic sheet in two dimensions. With the sheet being modelled by a deformable curve with the Wilmore energy and local inextensibility constraint, we derive a two-phase hydrodynamics model with the interfacial and boundary conditions consistent with the second law of thermodynamics. In particular, the boundary conditions on the sheet and at the moving contact line take the form of force balances involving the fluid stress, surface tensions, the sheet bending force and sheet tension, as well as friction forces arising from the slip of fluids on the sheet. The resulting model obeys an energy dissipation law. To demonstrate its capability of modelling complex elastocapillary interactions, we consider two applications: (1) the relaxation dynamics of a droplet on an elastic sheet and (2) the transport of a droplet driven by bendotaxis in a channel bounded by elastic sheets. Numerical solutions for the coupled fluid–sheet dynamics are obtained using the finite element method. The detailed information provided by the full hydrodynamics model allows us to better understand the dynamical processes as compared to other simplified models that were used in previous work.

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“…The surface displacement caused by a sessile drop could be very small for stiff solid surfaces; but significantly for highly deformable substances and gels (Pozrikidis, 2013). It has been reported that there is a small change of the contact angle for stiff solid surface; and highly deformable substrates cannot withstand capillary force.…”

Section: Introductionmentioning

confidence: 99%

Investigating Effects of Water Conditioning on the Adhesion Properties of Crack Sealant

Lamarre

Fini

Abu-Lebdeh

2016

American Journal of Engineering and Applied Sciences

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This paper investigates the effect of water exposure on three different crack sealants commonly used in cold, moderate and hot climates. It is hypothesized that water penetrates into the interface between crack sealant and substrates causing progressive adhesion failure and that the rate of failure varies depending on the sealant's surface chemistry as relates to its interaction with water molecules in different environmental conditions. Accordingly, this paper measures the change in sealant's adhesion strength and surface energy before and after water conditioning. To study adhesion strength and its change due to water conditioning, three different types of sealant were tested using Direct Adhesion Tester (DAT). It was found that the adhesion strength of all three crack sealants reduces due to water exposure. In addition, to evaluate the surface properties and water phobicity of each sealant, the contact angle between a droplet of water and sealant surface was measured before and after conditioning at different temperature. The objective of the latter experiment was to determine whether sealants susceptibility to water would vary with pavement surface temperature. To do so, a sessile drop method utilizing FTA-1000 was used to determine the contact angle for each of the aforementioned water-sealant pairs at different temperatures. The results obtained were further used to calculate the work of adhesion at each scenario to be correlated to mechanical adhesion strength measured with DAT.

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Deformation of an elastic substrate due to a sessile drop

Cited by 4 publications

References 12 publications

Floating mechanism of a small liquid marble

Floating mechanism of a small liquid marble

Modelling moving contact lines on inextensible elastic sheets in two dimensions

Investigating Effects of Water Conditioning on the Adhesion Properties of Crack Sealant

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