Temperature control of pattern formation in the Ru(bpy)(3)(2+)-catalyzed BZ-AOT system.
Using temperature as a control parameter, we observe a transition from stationary Turing patterns at T = 15-20 degrees C to traveling waves at T = 50 degrees C (and above) in the Ru(bpy)(3)(2+)-catalyzed Belousov-Zhabotinsky (BZ) reaction incorporated into the water nanodroplets of a water-in-oil aerosol OT (AOT) microemulsion. At constant chemical composition, molar ratio and droplet fraction, the transition takes place via a series of stable patterns, including oscillatory Turing patterns (at 35-40 degrees C) and reversed oscillatory Turing patterns (at 50 degrees C). We attribute the pattern transitions to a temperature-induced percolation transition of the BZ-AOT microemulsion, implying a change from isolated water nanodroplets to a system-spanning network of water channels.
McIlwaine
Rachel
R
Department of Chemistry and Volen Center for Complex Systems, MS 015, Brandeis University, Waltham, 02454-9110, USA.
Vanag
Vladimir K
VK
Epstein
Irving R
IR