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Macroscopic dynamics as reporter of mesoscopic organization: the Belousov-Zhabotinsky reaction in aqueous layers of DPPC lamellar phases

Biosa, Grazia and Ristori, Sandra and Spalla, Olivier and Rustici, Mauro and Hauser, Marcus J. B. (2011) Macroscopic dynamics as reporter of mesoscopic organization: the Belousov-Zhabotinsky reaction in aqueous layers of DPPC lamellar phases. The Journal of Physical Chemistry. A, Vol. 115 (15), p. 3227-3232. ISSN 1089-5639. Article.

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DOI: 10.1021/jp2004375

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 ∼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 a 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 orders of magnitude.

Item Type:Article
ID Code:6412
Status:Published
Refereed:Yes
Uncontrolled Keywords:Belousov-Zhabotinsky reaction, chemical waves, oscillating reactions, pattern formation
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:American Chemical Society
ISSN:1089-5639
Copyright Holders:© 2011 American Chemical Society
Deposited On:26 Aug 2011 10:46

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