Active Role of a Color Indicator in Buoyancy-Driven Instabilities of Chemical Fronts

被引：55

作者：

Almarcha, C. ^{[1
]}

Trevelyan, P. M. J. ^{[1
]}

Riolfo, L. A. ^{[2
]}

Zalts, A. ^{[3
]}

El Hasi, C. ^{[3
]}

D'Onofrio, A. ^{[2
]}

De Wit, A. ^{[1
]}

机构：

[1] Univ Libre Bruxelles, Fac Sci, Nonlinear Phys Chem Unit, B-1050 Brussels, Belgium

[2] Univ Buenos Aires, Fac Ingn, Grp Medios Porosos, RA-1063 Buenos Aires, DF, Argentina

[3] Univ Nacl Gen Sarmiento, Buenos Aires, DF, Argentina

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2010年 / 1卷 / 04期

关键词：

PATTERN-FORMATION; CONVECTION; EVOLUTION;

D O I：

10.1021/jz900418d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Chemical reactions are able to trigger hydrodynamic flows by changing the density of the solutions across reactive interfaces. In this work,, an experimental study of the buoyancy driven hydrodynamic instabilities that can occur when two miscible reactive solutions of an acid base system are put in contact in the gravity field shows that the patterns observed and the instabilities taking place strongly depend on the presence of a color indicator. A reaction diffusion convection model explains how the color indicator can modify the instability scenarios by affecting the density of the solutions and allows one to numerically recover the observed experimental patterns. The present work clearly demonstrates that color indicators should therefore be used with caution in experimental works devoted to analyze reaction-diffusion-convection patterns and instabilities.

引用

页码：752 / 757

页数：6

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