SURFACE PRESSURE CONTROL OF PHOSPHOLIPID MONOLAYERS AT THE WATER 1,2-DICHLOROETHANE INTERFACE/

We present a novel type of Langmuir trough which enables the study of monolayers deposited at the immiscible liquid/liquid interface under c ontrolled surface pressure. Isotherms of phospholipids have been obtai ned both at the air/water and, for the first time, at the water/1,2-di chloroethane interfaces. The latter isotherms did not show well-define d plateau regions or phase transitions, probably due to the small size of the 1,2-dichloroethane molecules, which makes them very mobile in the surface phase. It was possible to keep the surface pressure of the monolayers constant for at least 0.5 h, which means that they can be used for electrochemical experiments, for example for the study of the kinetics of charge transfer across such monolayers.