Abstract
Foam films prepared from dispersions of dimyristoylphophatidylcholine (DMPC) in water and a water–ethanol mixture have been investigated. The thickness of the films and their contact angle with the surrounding meniscus of liquid have been measured as a function on the concentration of NaCl and CaCl 2. The measurements show that the preparation of the lipid dispersions influences long and short-range interactions. The binding of Ca 2+-ions onto the DMPC headgroups leads to charging of the monolayers and electrical double-layer repulsion in the film. There is also some indication for a weak binding of Na +-ions. The free energy of film formation determined from contact angle measurements provides additional information on the estimation of the different contributions to the interaction in the film.
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