Super-Elastic Air/Water Interfacial Films Self-Assembled from Soluble Surfactants

Authors

  • Dr. Artem Kovalenko,

    1. Institut Charles Sadron (UPR CNRS 22), University of Strasbourg, 23 rue du Loess, 67034 Strasbourg Cedex (France)
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  • Dr. Prasad Polavarapu,

    1. Institut Charles Sadron (UPR CNRS 22), University of Strasbourg, 23 rue du Loess, 67034 Strasbourg Cedex (France)
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  • Dr. Jean-Louis Gallani,

    1. Institut de Physique et de Chimie des Matériaux de Strasbourg (UMR 7504), University of Strasbourg, 23 rue du Loess. 67034 Strasbourg Cedex (France)
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  • Dr. Geneviève Pourroy,

    1. Institut de Physique et de Chimie des Matériaux de Strasbourg (UMR 7504), University of Strasbourg, 23 rue du Loess. 67034 Strasbourg Cedex (France)
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  • Dr. Gilles Waton,

    1. Institut Charles Sadron (UPR CNRS 22), University of Strasbourg, 23 rue du Loess, 67034 Strasbourg Cedex (France)
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  • Dr. Marie Pierre Krafft

    Corresponding author
    1. Institut Charles Sadron (UPR CNRS 22), University of Strasbourg, 23 rue du Loess, 67034 Strasbourg Cedex (France)
    • Institut Charles Sadron (UPR CNRS 22), University of Strasbourg, 23 rue du Loess, 67034 Strasbourg Cedex (France)

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Abstract

We show that water-soluble monosodic salts of F-alkyl phosphates CnF2n+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.

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