Viscous Fingering Induced by a pH-Sensitive Clock Reaction
| Autor: | A. De Wit, Alberto P. Muñuzuri, Jorge Carballido-Landeira, D. M. Escala |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 01 natural sciences Instability Viscous fingering chemistry.chemical_compound Viscosity Sulfite Electrochemistry Chimie Physique des surfaces General Materials Science skin and connective tissue diseases Iodine clock reaction Spectroscopy Acrylic acid chemistry.chemical_classification Surfaces and Interfaces Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences chemistry Chemical physics sense organs 0210 nano-technology Displacement (fluid) |
| Zdroj: | Langmuir, 35 (11 |
| ISSN: | 1520-5827 |
| Popis: | A pH-changing clock chemical system, also known to induce changes in viscosity, is shown experimentally to induce a viscous fingering instability during the displacement of reactive solutions in a Hele-Shaw cell. Specifically, a low-viscosity solution of formaldehyde is displaced by a more viscous solution of sulfite and of a pH-sensitive poly(acrylic acid) polymer. The pH change triggered by the formaldehyde-sulfite clock reaction in the reactive contact zone between the two solutions affects the polymer and induces a local increase of the viscosity that destabilizes the displacement via a viscous fingering instability. The influence of changes in the chemical parameters on this fingering instability is analyzed using different techniques and the results are compared with numerical simulations. SCOPUS: ar.j info:eu-repo/semantics/published |
| Databáze: | OpenAIRE |
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