AN ACOUSTIC SPECTROSCOPY STUDY OF WATER DECYLPYRIDINIUM CHLORIDE MICELLAR SOLUTIONS - 2 - THE MECHANISM OF ACOUSTIC RELAXATION

Aqueous solutions of decylpyridinium chloride (DPC) with concentration s 0.2, 0.4, 1.0, 1.67, and 2.0 M were investigated by the acoustic spe ctroscopy technique in the frequency range 3-1250 MHz at temperatures from 283 to 353 K. It was shown that the mechanism of acoustic relaxat ion is mainly caused by the interaction between micelles and the forma tion of aggregates. In DPC solutions with concentrations above 1.0 M, acoustic relaxation is caused by changes in the structure of the micel les and the character of their interaction. The absence of the region of rotational-isomeric relaxation in the acoustic spectra suggests tha t the core of a micelle has an ordered structure and its properties ar e similar to crystalline hydrocarbons.