Jump to main content
Jump to site search

Issue 38, 2011
Previous Article Next Article

Differential diffusion effects on buoyancy-driven instabilities of acid–base fronts: the case of a color indicator

Author affiliations

Abstract

Buoyancy-driven hydrodynamic instabilities of acid–base fronts are studied both experimentally and theoretically in the case where an aqueous solution of a strong acid is put above a denser aqueous solution of a color indicator in the gravity field. The neutralization reaction between the acid and the color indicator as well as their differential diffusion modifies the initially stable density profile in the system and can trigger convective motions both above and below the initial contact line. The type of patterns observed as well as their wavelength and the speed of the reaction front are shown to depend on the value of the initial concentrations of the acid and of the color indicator and on their ratio. A reaction-diffusion model based on charge balances and ion pair mobility explains how the instability scenarios change when the concentration of the reactants are varied.

Graphical abstract: Differential diffusion effects on buoyancy-driven instabilities of acid–base fronts: the case of a color indicator

Back to tab navigation

Publication details

The article was received on 14 Apr 2011, accepted on 26 Jul 2011 and first published on 31 Aug 2011


Article type: Paper
DOI: 10.1039/C1CP21185D
Citation: Phys. Chem. Chem. Phys., 2011,13, 17295-17303
  •   Request permissions

    Differential diffusion effects on buoyancy-driven instabilities of acid–base fronts: the case of a color indicator

    S. Kuster, L. A. Riolfo, A. Zalts, C. El Hasi, C. Almarcha, P. M. J. Trevelyan, A. De Wit and A. D'Onofrio, Phys. Chem. Chem. Phys., 2011, 13, 17295
    DOI: 10.1039/C1CP21185D

Search articles by author

Spotlight

Advertisements