Physics of solid–liquid interfaces: From the Young equation to the superhydrophobicity (Review Article)

Bormashenko, Edward

doi:10.1063/1.4960495

Cited by 38 publications

(24 citation statements)

References 77 publications

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“…The Young's contact angle is the equilibrium contact angle that a liquid makes with an ideal solid surface. For droplets or surfaces with very small radii of curvature deposited on the ideal surfaces, the equilibrium contact angle may be different due to line tension [53]. Moreover, the Young's contact angle depends only on the physicochemical nature of the three phases and it is independent of the droplet shape and external field under very general assumptions.…”

Section: Wetting On the Ideally Smooth Surface-young's Equation And Cmentioning

confidence: 99%

Recent Progress in Preparation and Anti-Icing Applications of Superhydrophobic Coatings

et al. 2018

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Aircraft icing refers to ice formation and accumulation on the windward surface of aircrafts. It is mainly caused by the striking of unstable supercooled water droplets suspended in clouds onto a solid surface. Aircraft icing poses an increasing threat to the safety of flight due to the damage of aerodynamic shape. This review article provides a comprehensive understanding of the preparation and anti-icing applications of the superhydrophobic coatings applied on the surface of aircrafts. The first section introduces the hazards of aircraft icing and the underlying formation mechanisms of ice on the surface of aircrafts. Although some current anti-icing and de-icing strategies have been confirmed to be effective, they consume higher energy and lead to some fatigue damages to the substrate materials. Considering the icing process, the functional coatings similar to lotus leaf with extreme water repellency and unusual self-cleaning properties have been proposed and are expected to reduce the relied degree on traditional de-icing approaches and even to replace them in near future. The following sections mainly discuss the current research progress on the wetting theories of superhydrophobicity and main methods to prepare superhydrophobic coatings. Furthermore, based on the bouncing capacity of impact droplets, the dynamic water repellency of superhydrophobic coatings is discussed as the third evaluated parameter. It is crucial to anti-icing applications because it describes the ability of droplets to rapidly bounce off before freezing. Subsequently, current studies on the application of anti-icing superhydrophobic coatings including the anti-icing mechanisms and application status are introduced in detail. Finally, some limitations and issues related to the anti-icing applications are proposed to provide a future outlook on investigations of the superhydrophobic anti-icing coatings.

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Section: Wetting On the Ideally Smooth Surface-young's Equation And Cmentioning

confidence: 99%

Recent Progress in Preparation and Anti-Icing Applications of Superhydrophobic Coatings

et al. 2018

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“…The results shown in Table reflect that the hydrogen termination of the electrodes used here was preserved during the AuNP deposition process, which was ensured by annealing the gold films in an inert atmosphere during the de‐wetting stage. There is evidence that the contact angle of a surface is reduced when the roughness of that surface is increased, which is why the BDD electrodes had smaller contact angles than the pBDD electrodes .…”

Section: Discussionmentioning

confidence: 99%

Diamond Electrodes for High Sensitivity Mercury Detection in the Aquatic Environment: Influence of Surface Preparation and Gold Nanoparticle Activity

2019

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This work compares polished and unpolished boron doped diamond (BDD) electrodes decorated with two sizes of gold nanoparticles (AuNPs) for use as robust mercury sensors in aquatic environments. The size of the catalytically active AuNPs on the electrode surfaces was demonstrated to have a less significant effect on the sensitivity for mercury detection than the surface preparation of the BDD. The lowest limits of detection were achieved with the polished BDD electrodes, which both detected mercury at a concentration of 1 pM, six orders of magnitude greater sensitivity than the lowest detection limit of 5 μM achieved with an unpolished BDD electrode, and high in comparison with other reported electrode systems.

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“…In this paper, we indirectly consider the presence of a water coating layer, which is affecting contact angles that are input parameters to our model. The thickness of water film ∼10 nm (Bormashenko ) is neglected for simplicity, because it would otherwise introduce the irreducible water saturation of the crack as an additional parameter to our model. We also do not consider explicitly the surface chemistry (and chemical contamination) characterizing the physicochemical interactions between immiscible pore fluids and the crack surface.…”

Section: Introductionmentioning

confidence: 99%

Contact line friction and surface tension effects on seismic attenuation and effective bulk moduli in rock with a partially saturated crack

Rozhko

Bauer

2018

Geophysical Prospecting

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The effect of surface phenomena occurring at the interfaces between immiscible fluids and a solid on the seismic attributes of partially saturated rocks has not yet been fully studied. Meanwhile, over the past two decades considerable progress has been made in the physics of wetting to understand effects such as contact line friction, contact line pinning, contact angle hysteresis, and equilibrium contact angle. In this paper, we developed a new rock physics model considering the aforementioned effects on seismic properties of the rock with a partially saturated plane‐strain crack. We demonstrated that for small wave‐induced stress perturbations, the contact line of the interface meniscus will remain pinned, while the meniscus will bulge and change its shape through the change of the contact angles. When the stress perturbation is larger than a critical value, the contact line will move with advancing or receding contact angle depending on the direction of contact line motion. A critical stress perturbation predicted by our model can be in the range of ∼102−104 Pa, that is typical for linear seismic waves. Our model predicts strong seismic attenuation in the case when the contact line is moving. When the contact line is pinned, the attenuation is negligibly small. Seismic attenuation is associated with the hysteresis of loading and unloading bulk moduli, predicted by our model. The hysteresis is large when the contact line is moving and negligibly small when the contact line is pinned. Furthermore, we demonstrate that the bulk modulus of the rock with a partially saturated crack depends also on the surface tension and on the contact angle hysteresis. These parameters are typically neglected during calculation of the effecting fluid moduli by applying different averaging techniques. We demonstrate that contact line friction may be a dominant seismic attenuation mechanism in the low frequency limit (<∼10 Hz) when capillary forces dominate over viscous forces during wave‐induced two‐phase fluid flow.

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Physics of solid–liquid interfaces: From the Young equation to the superhydrophobicity (Review Article)

Cited by 38 publications

References 77 publications

Recent Progress in Preparation and Anti-Icing Applications of Superhydrophobic Coatings

Recent Progress in Preparation and Anti-Icing Applications of Superhydrophobic Coatings

Diamond Electrodes for High Sensitivity Mercury Detection in the Aquatic Environment: Influence of Surface Preparation and Gold Nanoparticle Activity

Contact line friction and surface tension effects on seismic attenuation and effective bulk moduli in rock with a partially saturated crack

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