Colloid and Polymer Science

, Volume 288, Issue 4, pp 449–459 | Cite as

Ca2+- and Mg2+-induced molecular interactions in a dehydrocholic acid/didodecyldimethylammonium bromide mixed monolayer

  • Paula V. MessinaEmail author
  • Juan Manuel Ruso
  • Gerardo Prieto
  • Marcos D. Fernández-Leyes
  • Pablo C. Schulz
  • Félix Sarmiento
Original Contribution


The aim of this article is the evaluation of Ca2+ and Mg2+ subphases presence effect on mixed monolayers composed by dehydrocholic acid (HDHC) and didodecyldimethylammonium bromide (DDAB). The monolayer stability was analyzed by the evaluation of thermodynamic parameters, ΔG mix E and α. At all calcium ion-tested concentration, the mixed systems X HDHC = 0.6 and 0.8 at π = 30 mJ m−2 were always the most favored proportions. The X HDHC = 0.6 system was also stable in magnesium presence, and the X HDHC = 0.2-mixed monolayer went through a stable to an unstable state as the content of Ca2+ or Mg2+ augment. Finally, the X HDHC = 0.4 monolayer showed a particular behavior, i.e., remained stable at low cation concentration, unstable at intermediate concentration and stable again at high concentration. The effect was similar at Mg2+ presence.


Bile salts Air-solution interface Langmuir monolayers Divalent cations Monolayer stability 



The authors acknowledge the financial support from the Universidad Nacional del Sur, Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), Concejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET), the Spanish “Ministerio de Educación y Ciencia” (Project MAT 2008-04722). JMR thank “Consellería de Educación e Ordenación Universitaria de Xunta de Galicia” and “Dirección Xeral de Promoción Científica e Tecnolóxica do Sistema Universitario de Galicia”. PM is an adjunct researcher of (CONICET). MFL has a fellowship of the CONICET.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Paula V. Messina
    • 1
    Email author
  • Juan Manuel Ruso
    • 2
  • Gerardo Prieto
    • 3
  • Marcos D. Fernández-Leyes
    • 1
  • Pablo C. Schulz
    • 1
  • Félix Sarmiento
    • 3
  1. 1.Departamento de QuímicaUniversidad Nacional del Sur. CONICET-INQUISURBahía BlancaArgentina
  2. 2.Soft Matter and Molecular Biophysics Group, Departamento de Física Aplicada, Facultade de FísicaUniversidad de Santiago de CompostelaSantiago de CompostelaEspaña
  3. 3.Biophysics and Interfaces Group, Departamento de Física Aplicada, Facultade de FísicaUniversidad de Santiago de CompostelaSantiago de CompostelaEspaña

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