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    Mixed Langmuir Monolayers of Gramicidin A and Ethyl Palmitate: Pressure-Area Isotherms and Brewster Angle Microscopy

    Year: 2002

    Journal: J. Phys. Chem. B 2002, 106, 9820-9824, 20111221

    Authors: N. Vila-Romeu, M. Nieto-Suarez, P. Dynarowicztka, and I. Prieto

    Organizations: Department of Physical Chemistry, Faculty of Sciences, University of Vigo; Campus As Lagoas, s/n 32004 Ourense, Spain, and Department of General Chemistry, Faculty of Chemistry, Jagiellonian University, Ingarderna 3, 30-060 Krakow, Poland

    Isotherms of surface pressure, π, against mean molecular area, A, were obtained for monolayers of gramicidin A (GA), ethyl palmitate (EP), and mixtures of the two spread at the air-water interface of aqueous solutions of CaCl2 at 15, 20, and 25 °C. Plots of A and of monolayer collapse pressure (π c) against mole fraction of GA (XGA) both suggest miscibility between GA and EP in monolayers at the working temperatures. The morphology of GA, EP, and GA/EP monolayers on aqueous NaCl and CaCl2 solutions at these temperatures was studied by Brewster angle microscopy. The two-dimensional GA/EP solution containing numerous small microdomains of condensed phase was visualized at any surface pressure.