title: Super-elastic air/water interfacial films self-assembled from soluble surfactants.
abstract: We show that water-soluble monosodic salts of F-alkyl phosphates C(n)F(2n+1) (CH2)2OP(O)(OH)2, with n=8 and 10 (F8H2Phos and F10H2Phos) form Gibbs films with exceptionally high dilational viscoelastic modules E that reach ~900 mN m(-1) in the condensed phases. These E values are up to one order of magnitude larger than those recorded for phospholipid, protein and polymer films commonly considered as highly viscoelastic. F8H2Phos.1Na undergoes a transition between a liquid-expanded and a liquid-condensed phase. In the case of F10H2Phos.1Na, a transition occurs between a gas phase of surface domains, in which the molecules are densely packed, and a liquid-condensed phase.
authors: Institut Charles Sadron (UPR CNRS 22), University of Strasbourg, 23 rue du Loess, 67034 Strasbourg Cedex (France).
authors: Artem
authors: A
authors: Kovalenko
authors: Prasad
authors: P
authors: Polavarapu
authors: Jean-Louis
authors: JL
authors: Gallani
authors: Geneviève
authors: G
authors: Pourroy
authors: Gilles
authors: G
authors: Waton
authors: Marie Pierre
authors: MP
authors: Krafft
keywords: interfaces; rheology; surfactants; tensiometry; thin films