Acta Chimica - Models in Chemistry 130. (1993)
1. szám - RESEARCH ARTICLES - Iordache, O.–Corriou, J. P.–Valentin, G.–Pons, M. N.–Pethő A.: Intermittent interfacial transfer: a dyadic model
Acta Chimica Hungarica - Models in Chemistry 130 (1), pp. 1-18 (1993) INTERMITTENT INTERFACIAL TRANSFER: A DYADIC MODEL O. IORDACHE1, J. P. CORRIOU1*, G. VALENTIN1, M. N. PONS1 and A. PETHŐ2 1LSGC-ENSIC, 1, me Grandville, BP 451, 54001 Nancy Cedex, France Universität Hannover, Callinstr. 3, D-3000 Hannover 1, Germany Received April 9, 1992 An interfacial mass transfer system was studied consisting of an oil layer of nitrobenzene containing iodine and potassium iodide, imposed between two aqueous phases, one of which contained the surfactant hexadecyl-trimethylammonium bromide. Intermittent and piecewise constant domains of variations of electric potential have been observed. A dyadic model capable of explaining multi-scale transfer phenomena through hierarchically structured interfaces is proposed. Actual interpretations of dyadic time and of dyadic derivative are given. The recorded intermittent signal is expressed in terms of orthogonal Walsh-Hadamard functions. Since the studied system shows similar output potential patterns to the observed biological patterns, potential applications for adaptive sensors and technologies are emphasized. Introduction Various chemical and biochemical systems exhibit electrical oscillations, intermittent bursting or beating domains of behaviour. These phenomena have received much attention as dissipative effects observed in far-from equilibrium physical systems as well as in the study of biological neural circuits. It is remarkable that a similar behaviour can been observed both in natural and in artificial membrane systems (see [1], [2],[3]). For instance, relaxation type quasiperiodicity has been found in the interfacial electric potential of oil/water system in the presence of surfactants. Porous membranes doped with sorbitan monooleate exhibit self-excitation phenomena. The development of artificial membranes is necessary in order to mimic the mechanism of excitability in natural biosystems. If the reproducibility of the intermittencies or oscillations in artificial membranes were good, the effects of * To whom correspondence should be addressed