https://doi.org/10.1007/s100510050749
Polymer-mediated interactions of fluid membranes in a lyotropic lamellar phase: a small angle X-ray and neutron scattering study
Groupe de Dynamique des Phases Condensées (UMR UMII/CNRS 5581) , C.C. 26,
Université Montpellier II 34095 Montpellier Cedex 5, France
Received:
20
January
1998
Published online: 15 May 1999
Small angle X-ray and neutron scattering data on an effective three-component lamellar
phase composed of water, a non adsorbing water-soluble polymer
(polyvynilpyrolidone), fluid membranes, made from a mixture of a cationic surfactant
(cetylpiridiumchloride) and a cosurfactant (hexanol), are presented for various
membrane as well as polymer concentrations. The data are fitted with a recently
proposed model which takes into account the geometry and the fluctuations of these
periodic structures. This allows a quantitative study of the polymer contribution to the
smectic compression modulus 
of the lamellar phase. Four different regimes of
polymer confinement are expected. The associated variations in are compared
to a recent theoretical model, which predicts the polymer-mediated contribution to the
smectic compression modulus.
PACS: 61.30.Eb – Experimental determinations of smectic, nematic, cholesteric, and other structures / 82.70.-y – Disperse systems / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
