Collect. Czech. Chem. Commun. 2000, 65, 1394-1402

Pattern Formation in the Methylene Blue-Fructose-Oxygen System in Aqueous Solution and in Gel Systems

Ľubica Adamčíková*, Mária Hupková and Peter Ševčík

Department of Physical Chemistry, Comenius University, 842 15 Bratislava, Slovak Republic


Spatial patterns in methylene blue-catalyzed oxidation of fructose at alkaline pH were found in aqueous solution and in gel systems. In a thin liquid layer (thickness >2.4 mm) a mixture of spots and stripes was formed by interaction of a nonlinear reaction and the Rayleigh or Maragoni instabilities. The pattern formation was affected by initial reactant concentrations and by the thickness of the reaction mixture layer. Long-lasting structures were formed in gel systems (polyacrylamide, agar, gelatin). These patterns also arise primarily from hydrodynamic processes.

Keywords: Pattern formation; Gels; Interfaces; Methylene blue; Fructose; Oxygen; Oxidations; Oscillating reactions.

References: 21 live references.