Super‐Elastic Air/Water Interfacial Films Self‐Assembled from Soluble Surfactants |
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| Authors: | Dr Artem Kovalenko Dr Prasad Polavarapu Dr Jean‐Louis Gallani Dr Geneviève Pourroy Dr Gilles Waton Dr Marie Pierre Krafft |
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| Affiliation: | 1. Institut Charles Sadron (UPR CNRS 22), University of Strasbourg, 23 rue du Loess, 67034 Strasbourg Cedex (France);2. 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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| 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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| Keywords: | interfaces rheology surfactants tensiometry thin films |
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