A. Elabed et al., DYNAMIC BEHAVIOR OF PYRAMIDIC LIQUID-CRYSTAL FILM AT THE AIR-WATER-INTERFACE, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 265, 1995, pp. 151-161
Molecular organization of the different phases of a pyramidic liquid c
rystal film spread at the air-water interface has been investigated us
ing Langmuir balance and current displacement techniques simultaneousl
y. The mesogenic compound exhibits a main transition from an expanded
phase to a metastable condensed phase. The results are in agreement wi
th previous polarized and fluorescence light microscopy measurements a
nd grazing incidence X-ray reflectometry. The study shows that the mol
ecules are oriented edge-on in the condensed phase and side-on in the
liquid expanded phase. The value of the dipole moment of the pyramidic
molecules is given in the liquid expanded phase. Two kinds of displac
ement current curves were obtained depending on the kinetic of compres
sion.