Moving Contact Lines: Scales, Regimes, and Dynamical Transitions

Snoeijer, Jacobus Hendrikus; Andreotti, Bruno

doi:10.1146/annurev-fluid-011212-140734

Cited by 682 publications

(627 citation statements)

References 110 publications

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“…The oscillatory method may also serve as an efficient tool for studying the microscopic origins of the wetting dynamics, including the role of the contact line pinning and unpinning that leads to the 'stick and slip' behaviour and CAH 42,43 . In addition, the demonstrated oscillatory method is compatible with existing optical goniometers and is not limited by the optical errors like in typical goniometric techniques.…”

Section: Discussionmentioning

confidence: 99%

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

et al. 2013

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The recently demonstrated extremely water-repellent surfaces with contact angles close to 180°with nearly zero hysteresis approach the fundamental limit of non-wetting. The measurement of the small but non-zero energy dissipation of a droplet moving on such a surface is not feasible with the contemporary methods, although it would be needed for optimized technological applications related to dirt repellency, microfluidics and functional surfaces. Here we show that magnetically controlled freely decaying and resonant oscillations of water droplets doped with superparamagnetic nanoparticles allow quantification of the energy dissipation as a function of normal force. Two dissipative forces are identified at a precision of B10 nN, one related to contact angle hysteresis near the three-phase contact line and the other to viscous dissipation near the droplet-solid interface. The method is adaptable to common optical goniometers and facilitates systematic and quantitative investigations of dynamical superhydrophobicity, defects and inhomogeneities on extremely superhydrophobic surfaces.

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Section: Discussionmentioning

confidence: 99%

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

et al. 2013

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“…Under model assumptions, this has the simple form derived from the Young-Dupré' equation. A similar formulation could be adopted to describe more realistic scenarios involving finite contact angle hysteresis, provided substitutive descriptions of the energy and force balance at the triple contact lines 34 .…”

Section: Resultsmentioning

confidence: 99%

Modeling capillary forces for large displacements

Mastrangeli

Arutinov

Smits

et al. 2014

Microfluid Nanofluid

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Originally applied to the accurate, passive positioning of submillimetric devices, recent works proved capillary self-alignment as effective also for larger components and relatively large initial offsets. In this paper we describe an analytic quasi-static model of 1D capillary restoring forces that generalizes existing geometrical models and extends the validity to large displacements from equilibrium. The piece-wise nature of the model accounts for contact line unpinning singularities ensuing from large perturbations of the liquid meniscus and dewetting of the bounding surfaces. The superior accuracy of the generalized model across the extended displacement range, and particularly beyond the elastic regime as compared to purely elastic models, is supported by finite element simulations and recent experimental evidence. Limits of the model are discussed in relation to the aspect ratio of the meniscus, contact angle hysteresis, tilting and self-alignment dynamics.

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“…The main system parameters concerning its diffusion-controlled dissolution or growth are also indicated. equilibrium angle, and that it completely describes the contact line dynamics (Snoeijer & Andreotti 2013). Hong et al (2011) recently proposed a thermodynamic model based on adhesion hysteresis able to predict the static CAH for SCBs enduring sequential changes in volume.…”

Section: Spherical Cap Bubble Characterization and Contact Line Dynamicsmentioning

confidence: 99%

Dissolution of a spherical cap bubble adhered to a flat surface in air-saturated water

2015

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Bubbles adhered to partially hydrophobic flat s u r faces o f t en a t t ain a s p h erical cap shape with a contact angle much greater than zero. We address the fundamental problem of the diffusion-driven dissolution of a sessile spherical cap bubble (SCB) adhered to a flat s mooth s urface. I n p articular, w e p erform e xperiments on the dissolution of CO 2 bubbles (with initial radii ∼1 mm) immersed in air-saturated water adhered to two substrates with different levels of hydrophobicity. It is found that the contact angle dynamics plays an important role in the bubble dissolution rate. A dissolution model for a multicomponent SCB in an isothermal and uniform pressure environment is then devised. The model is based on the quasi-stationary approximation. It includes the effect of the contact angle dynamics, whose behaviour is predicted by means of a simplified modelb ased on the results obtained from adhesion hysteresis. The presence of an impermeable substrate hinders the overall rate of mass transfer. Two approaches are considered in its determination: (a) the inclusion of a diffusion boundary layer-plate interaction model and (b) a finite-difference solution. The model solutions are compared with the experimental results, yielding fairly good agreement.

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Moving Contact Lines: Scales, Regimes, and Dynamical Transitions

Cited by 682 publications

References 110 publications

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

Modeling capillary forces for large displacements

Dissolution of a spherical cap bubble adhered to a flat surface in air-saturated water

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