Nonequilibrium Interfacial Tension in Simple and Complex Fluids
| Autor: | Christelle Dupas, Domenico Truzzolillo, Luca Cipelletti, Serge Mora |
|---|---|
| Přispěvatelé: | Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et Génie Civil (LMGC), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), ANR-10-BLAN-0402,F2F,De la digitation visqueuse à la fracture(2010), ANR-14-CE32-0005,FAPRES,Précurseurs de la défaillance dans les matériaux mous(2014) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Materials science Capillary action Physics QC1-999 General Physics and Astronomy Non-equilibrium thermodynamics Thermodynamics 02 engineering and technology Mechanics Polymer 021001 nanoscience & nanotechnology 01 natural sciences Homogenization (chemistry) [SPI.MAT]Engineering Sciences [physics]/Materials [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Surface tension chemistry 0103 physical sciences Polymer physics 010306 general physics 0210 nano-technology Concentration gradient Complex fluid |
| Zdroj: | Physical Review X Physical Review X, American Physical Society, 2016, 6, pp.041057. ⟨10.1103/PhysRevX.6.041057⟩ Physical Review X, Vol 6, Iss 4, p 041057 (2016) |
| ISSN: | 2160-3308 |
| DOI: | 10.1103/PhysRevX.6.041057⟩ |
| Popis: | International audience; Interfacial tension between immiscible phases is a well-known phenomenon, which manifests itself in everyday life, from the shape of droplets and foam bubbles to the capillary rise of sap in plants or the locomotion of insects on a water surface. More than a century ago, Korteweg generalized this notion by arguing that stresses at the interface between two miscible fluids act transiently as an effective, nonequilibrium interfacial tension, before homogenization is eventually reached. In spite of its relevance in fields as diverse as geosciences, polymer physics, multiphase flows, and fluid removal, experiments and theoretical works on the interfacial tension of miscible systems are still scarce, and mostly restricted to molecular fluids. This leaves crucial questions unanswered, concerning the very existence of the effective interfacial tension, its stabilizing or destabilizing character, and its dependence on the fluid's composition and concentration gradients. We present an extensive set of measurements on miscible complex fluids that demonstrate the existence and the stabilizing character of the effective interfacial tension, unveil new regimes beyond Korteweg's predictions, and quantify its dependence on the nature of the fluids and the composition gradient at the interface. We introduce a simple yet general model that rationalizes nonequilibrium interfacial stresses to arbitrary mixtures, beyond Korteweg's small gradient regime, and show that the model captures remarkably well both our new measurements and literature data on molecular and polymer fluids. Finally, we briefly discuss the relevance of our model to a variety of interface-driven problems, from phase separation to fracture, which are not adequately captured by current approaches based on the assumption of small gradients. |
| Databáze: | OpenAIRE |
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