Abstract:

The morhology of the organized assemblies of C10H21-O-ph-CH=CH-ph-CH3I (C10OMI) in aqueous dispersions is long rod-like or vesicular. In neutral dispersions, addition of sodium dodecylsulfate (C12SO4Na) induces the transition from long rods to vesicles, and hence the closer packing of C10OMI, forming the "H-aggregate" with a blue-shift of absorption spectrum. Under acidic conditions, C12SO4Na makes the vesicles of C10OMI to aggregate: It is suggested that the hydrophobic chain of C12SO4Na does not penetrate into the bilayers of C10OMI at low concentration. When the concentration of C12SO4Na reaches its CMC, C10OMI will be solubilized both in neutral and in acidic dispersions, so that the monomer absorbtion appears.

Key words: Organized molecular assemblies, Vesicle, Surfactant, Absorption Spectrum