Surfactant- and Aqueous-Foam-Driven Oil Extraction from Micropatterned Surfaces
| Autor: | Elise Lorenceau, Howard A. Stone, Jason Wexler, Rémy Mensire, Augustin Guibaud |
|---|---|
| Přispěvatelé: | Laboratoire Navier (navier umr 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), Department of Mechanical and Aerospace Engineering [Princeton] (MAE), Princeton University, École polytechnique (X) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Shearing (physics)
Materials science Aqueous solution Nanotechnology 02 engineering and technology Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Biofouling Surface tension Contact angle Chemical engineering Pulmonary surfactant 13. Climate action Drag 0103 physical sciences Electrochemistry General Materials Science 0210 nano-technology [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] Spectroscopy |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2016, 32 (49), pp.13149-13158. ⟨10.1021/acs.langmuir.6b03225⟩ |
| ISSN: | 0743-7463 1520-5827 |
| DOI: | 10.1021/acs.langmuir.6b03225⟩ |
| Popis: | International audience; Liquid-infused surfaces are rough or patterned surfaces in which a lubricating fluid, such as oil, is infused, which exhibits various original properties (omniphobicity, biofouling, drag reduction). An outer flow in a confined geometry can entrain the oil trapped between the pattern of the surfaces by shearing the oil–water interface and cause the loss of the omniphobic properties of the interface. Starting from the theoretical analysis of Wexler et al. (Shear-driven failure of liquid-infused surfaces. Phys. Rev. Lett. 2015, 114, 168301), where a pure aqueous solution is the outer phase, we extend the predictions by introducing an extraction efficiency parameter α and by accounting for new dynamical effects induced by surfactants and aqueous foams. For surfactant solutions, decreasing the oil–water interfacial tension (γow) not only enhances oil extraction as expected but also modifies the dynamics of the receding oil–water interface through the variations of the receding contact angle (θ) with the capillary number (Ca), which is the ratio between the viscous and the capillary forces at the oil–water interface. For aqueous foams, the extraction dynamics are also influenced by the foam flow: oil is sheared by the thin film between the bubbles and the lubricating layer, which imposes a stronger interfacial shear compared to pure aqueous solutions. In both surfactant and foam cases, the experimental observations show the existence of nonuniform extraction dynamics related to the surfactant-induced instability of a two-fluid shear flow. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|