monolayers of docosylamine on the subphases with a variety
The adsorption characteristics of a Langmuir-Blodgett (LB) of additives and a wide range of pH values. They also fabrifilm of octadecylamine (ODA) transferred from the surface of an cated LB films with these monolayers and investigated the alkaline subphase were investigated by employing dye material of layer structure by means of X-ray diffraction (12). Adsorpmethyl orange (MO) as an adsorbate. As a result, specific adsorbtion behavior on the cationic LB films is considered to be ability of the ODA LB film was observed, similarly to that of governed by various interactions, e.g., hydrophobic and dithe LB film of long-chain quaternary alkylammonium salt. The pole-dipole interactions in addition to ionic interaction.
structural characterizations of the ODA LB films before and after
Herder has reported the effect of adsorption of dodecylam-MO adsorption were also carried out by applying spectroscopic monium ions on the surface force between the micas coated methods. It was found that the MO molecules took the specific molecular arrangements of edge-on orientation on the LB film and with a monolayer of dimethyldioctadecylammonium brothat the bilayer in the LB films had an interdigitated structure. mide. He discussed the adsorption mechanism from mea-Furthermore, the layer-layer distance of the LB film was fairly surements of the long-range hydrophobic force as a function decreased by the MO adsorption, indicating the formation of anof the concentration (13).
other layer structure.