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Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2007

Structural and electric properties of two semifluorinated alkane monolayers compressed on top of a controlled hydrophobic monolayer substrate

Abdel-Illah El Abed
  • Fonction : Auteur
Radoslav Ionov
  • Fonction : Auteur
Michel Goldmann

Résumé

We investigate the dynamic behavior upon lateral compression of two mixed films made with one of the two semifluorinated alkanes F(CF(2))(8)(CH(2))(18)H and F(CF(2))(10)(CH(2))(10)H and the natural alpha-helix alamethicin peptide. Surface pressure, surface potential versus molecular area isotherms, and grazing-incidence x-ray diffraction were applied to characterize this system. We show that both mixed films demix vertically to form two asymmetric flat bilayers where the lower layer is made of alamethicin and the upper layer is made of semifluorinated molecules. The structure matching of the semifluorinated alkanes (where the hydrophilic group is missing) with a suitable organization of the underlying alamethicin monolayer allows for a continuous compression of the upper semifluorinated layers while the density of the lower alamethicin monolayer remains constant. Comparing data of the two studied mixed films enables us to evaluate the effect of chain length on the in-plane organization of the molecules and on the electric properties of the upper layers.
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Dates et versions

hal-01292980 , version 1 (24-03-2016)

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Abdel-Illah El Abed, Radoslav Ionov, Michel Goldmann. Structural and electric properties of two semifluorinated alkane monolayers compressed on top of a controlled hydrophobic monolayer substrate. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2007, 76 (4, 1), pp.041606. ⟨10.1103/PhysRevE.76.041606⟩. ⟨hal-01292980⟩
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