par Escala, Darío Martín 
;De Wit, Anne ;Carballido Landeira, Jorge ;Munuzuri, Alberto A.P.
Référence Langmuir, 35, 11, page (4182-4188)
Publication Publié, 2019-03-01
;De Wit, Anne ;Carballido Landeira, Jorge ;Munuzuri, Alberto A.P.Référence Langmuir, 35, 11, page (4182-4188)
Publication Publié, 2019-03-01
Article révisé par les pairs
| Résumé : | 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. |
