X-ray Reflectivity Study of Langmuir Films of Amphiphilic Monodendrons

Abstract

We have used X-ray reflectivity and Π-area isotherms to study Langmuir films of a series of second- and third-generation monodendrons with hydrophobic C 12 H 25 alkyl tails at the periphery and hydrophilic COOHCO 2 CH 3 or crown ether groups in the core. Both the limiting molecular areas and the layer thicknesss are consistent with a model in which the chains are directed nearly perpendicularly away from the water surface.