Abstract
A mathematical method has been developed for the numerical analysis of compression isotherms of distearoyl monogalactosyl glycerol (MGDG) monomolecular films at the air-water interface. The isotherms are given in terms of mean molecular urea (A. Angstrom (2)) versus surface pressure (pi. mN/m). The numerical analysis by the use of extended cubic spline functions and straight lilies of regression describes the compression isotherms and molecular packing of MGDG in two-dimensions us well as the calculation of two-dimensional (surface) compressibility (C-s) of MGDG monolayers with good precision. The phase transition found as a discontinuity in the relationship between the surface compressibility and surface pressure, according to the Ehrenfest theory, is interpreted as an apparent second-order phase transition from a liquid expanded to a liquid condensed stale in MGDG monolayers in substantial agreement with our previous findings by electron microscopy.
| Original language | English |
|---|---|
| Pages (from-to) | 851 - 861 |
| Number of pages | 11 |
| Journal | REVUE ROUMAINE DE CHIMIE |
| Volume | 45 |
| Issue number | 9 |
| Publication status | Published - Sept 2000 |