Abstract
This review is concerning the surface-chemical properties of self-assembly created with amphiphatic compounds in view of the following three kinds of self-assemblies; monolayer-type, bilayer-type and multilayer-type. The monolayer-type corresponds to the saturated adsorption of surfactants formed at various interfaces. Adsorbed amounts of interface were observed directly by a radiotracer method using 3H-labelled compounds. The saturated adsorption of surfactants influenced the interfacial phenomena caused by the foaming, surface tension lowering and so on.
The bilayer-type is a phospholipid bilayer dispersed in water. Phospholipid dispersions were mainly DMPC, NaDMPG, and NH4DMPG, the fundamental bilayer properties of which were precisely investigated on the effects of incubation temperature and period of aging times measured by DSC, XRD, and Zeta-potential. It was found that every phospholipids spontaneously converted into a new gel phase (Gel 2) after sufficiently hydrated with solvent water for a long period times. When hexadecane was emulsified by the state of Gel 2, the surface of emulsion was stabilized with adhesion of solubilized phospholipid bilayers, so-called three-phase emulsion, but not with adsorption of phospholipid monolayer.
The multilayer-type is a specific polymer LB film fabricated on Si-wafer after relaxated sufficiently surface pressure on the water surface. Synthetic polymer was aromatic polyether with a narrow distribution in polymerization condensation. A kind of epitaxial phenomenon was observed only on the Si-wafer surface.
