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Macroscopic Dynamics as Reporter of Mesoscopic Organization: The Belousov-Zhabotinsky Reaction in Aqueous Layers of DPPC Lamellar Phases

Research Area: Uncategorized Year: 2011
Type of Publication: Article
Authors:
  • Grazia Biosa
  • Sandra Ristori
  • Olivier Spalla
  • Mauro Rustici
  • Marcus J. B. Hauser
Journal: JOURNAL OF PHYSICAL CHEMISTRY A Volume: 115
Number: 15 Pages: 3227-3232
Month: April
ISSN: 1089-5639
Abstract:
The propagation of traveling chemical waves in the excitable Belousov-Zhabotinsky (BZ) system when performed in the presence of 1,2-dipalmitoyl-sn-glycero-3-phosphatidyl choline (DPPC) bilayers responds sensitively to the phospholipid content. The characteristic features of wave propagation, such as spiral pitch, rotation period, and size of the spiral core region, show two regions of different behavior, one below and the other above a DPPC content of 12.5% (w/w) thus suggesting a transition in the organization of the lipid domains at a DPPC content of similar to 12.5% (w/w). This transition is supported by small-angle X-ray scattering data, which show pronounced changes in the coherence lengths of the lyotropic smectic domains. Thus, the dynamics of the chemical system occurring at macroscopic length scale reflects the organization of the water/lipid domains which;extend over mesoscopic lengths These findings, indicate that in the BZ/DPPC system, there is an interaction between processes that occurs at length scales differing by as much as 3 order S of magnitude.
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