The pendant drop technique has been used for compressing and expanding
a monolayer film. Both the surface density and the molecular orientat
ion of the surfactant on the surface of a pendant drop can be determin
ed by a polarized fluorescent image for a surfactant molecule with a c
hromophore. The calculation based on the model developed matches the e
xperimental results on octadecyl rhodamine B very well. (C) 1998 Elsev
ier Science B.V. All rights reserved.