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Article Dans Une Revue Langmuir Année : 2010

Evolution toward the X Phase of Fatty Acid Langmuir Monolayers on a Divalent Cation Solution

Sophie Cantin
Sebastien Peralta
  • Fonction : Auteur
Philippe Fontaine
Michel Goldmann
Françoise Perrot
  • Fonction : Auteur
  • PersonId : 832467

Résumé

The structure of docosanoic acid monolayers spread over chloride salt solutions of copper was investigated by means of isotherm measurements, grazing incidence X-ray diffraction, and Brewster angle microscopy, as a function of the ion concentration and at two subphase pHs (5.5 and 7.5). The X phase is evidenced immediately above a concentration threshold which depends on the pH. The sequence of phases leading to this rigid phase involves two different processes depending oil the pH. The initial L(2h), phase evolves toward an X-like phase through a phase transition which is first order at pH 7.5 while it is second order at pH 5.5. The transition is then followed by a continuous evolution toward the X phase.
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Dates et versions

hal-01239031 , version 1 (07-12-2015)

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Sophie Cantin, Sebastien Peralta, Philippe Fontaine, Michel Goldmann, Françoise Perrot. Evolution toward the X Phase of Fatty Acid Langmuir Monolayers on a Divalent Cation Solution. Langmuir, 2010, 26 (2), pp.830-837. ⟨10.1021/la9022823⟩. ⟨hal-01239031⟩
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