J. Phys. II France
Volume 1, Numéro 9, September 1991
Page(s) 1085 - 1100
DOI: 10.1051/jp2:1991206
J. Phys. II France 1 (1991) 1085-1100

Elastic moduli and neutral surface for strongly curved monolayers. Analysis of experimental results

M. M. Kozlov1 and M. Winterhalter2

1  Freie Universität Berlin, FB Physik, WE2, Arnimallee 14, 1000 Berlin 33, Germany
2  Lehrstuhl für Biotechnologie, Röntgenring 11, 8700 Würzburg, Germany

(Received 20 March 1991, accepted 10 June 1991)

In this paper we apply our results concerning a new view on a mechanical description of strongly curved amphiphilic interfaces to experimental data available in the literature (Rand et al., 1990). Our theory predicts that, for cylindrical interfaces, one has to take into account, three elastic moduli corresponding to area extension, bending and mixed deformations. We determine the value of the three elastic moduli for the internal dividing surface of strongly curved DOPE monolayer in the H $_{{\rm II}}$-phase. Analysing for this purpose the experimental we recognise lateral compressibility and bending in the same time. As a result we recover the moduli that are closer to work one on bilayer than had been determined in precedent papers considering only bending energy. Using this set of parameters we find the position of the neutral surface and the values of elastic moduli corresponding to the neutral surface. We find the quantitative dependence of all the elastic moduli on the position of the dividing surface and compare them with those previously obtained.

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