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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Mchale, Glen
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Topics
Publications (10/10 displayed)
- 2023Superhydrophobicity of Auxetic Metamaterials
- 2019Leidenfrost heat enginecitations
- 2019Pinning-Free Evaporation of Sessile Droplets of Water from Solid Surfacescitations
- 2019Pinning-Free Evaporation of Sessile Droplets of Water from Solid Surfacescitations
- 2019Apparent Contact Angles on Lubricant Impregnated Surfaces/SLIPS: From Superhydrophobicity to Electrowettingcitations
- 2018Bioinspired nanoparticle spray-coating for superhydrophobic flexible materials with oil/water separation capabilitiescitations
- 2015Dielectrophoresis-Driven Spreading of Immersed Liquid Dropletscitations
- 2012Developing interface localized liquid dielectrophoresis for optical applicationscitations
- 2011Determination of the physical properties of room temperature ionic liquids using a love wave devicecitations
- 2007Surface free energy and microarray deposition technologycitations
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article
Pinning-Free Evaporation of Sessile Droplets of Water from Solid Surfaces
Abstract
<p>Contact-line pinning is a fundamental limitation to the motion of contact lines of liquids on solid surfaces. When a sessile droplet evaporates, contact-line pinning typically results in either a stick-slip evaporation mode, where the contact line pins and depins from the surface in an uncontrolled manner, or a constant contact-area mode with a pinned contact line. Pinning prevents the observation of the quasi-equilibrium constant contact-angle mode of evaporation, which has never been observed for sessile droplets of water directly resting on a smooth, nontextured, solid surface. Here, we report the evaporation of a sessile droplet from a flat glass substrate treated with a smooth, slippery, omni-phobic covalently attached liquid-like coating. Our characterization of the surfaces shows high contact line mobility with an extremely low contact-angle hysteresis of ∼1° and reveals a step change in the value of the contact angle from 101° to 105° between a relative humidity (RH) of 30 and 40%, in a manner reminiscent of the transition observed in a type V adsorption isotherm. We observe the evaporation of small sessile droplets in a chamber held at a constant temperature, T = (25.0 ± 0.1) °C and at constant RH across the range RH = 10-70%. In all cases, a constant contact-angle mode of evaporation is observed for most of the evaporation time. Furthermore, we analyze the evaporation sequences using the Picknett and Bexon ideal constant contact-angle mode for diffusion-limited evaporation. The resulting estimate for the diffusion coefficient, D<sub>E</sub> , of water vapor in air of D<sub>E</sub> = (2.44 ± 0.48) × 10<sup>-5</sup> m<sup>2</sup> s<sup>-1</sup> is accurate to within 2% of the value reported in the literature, thus validating the constant contact-angle mode of the diffusion-limited evaporation model.</p>