Absorption of ultrasonic waves in aqueous solutions of ?-cyclodextrin with alkylpyridinium or alkyltrimethylammonium bromides

Measurements of the absorption coefficient, alfa/f2, of aqueous solutions of ?-cyclodextrin with alkylpyridinium bromides CnH2n+1C5H4NBr or alkyltrimethylammonium bromides CnH2n+1N(CH3)3Br (n=8, 10, 12), were carried out at 15, 25, 35 and 45oC in the concentration range 0.01M to 0.04M and frequency range 1MHz to 150MHz. The occurrence of two ultrasonic relaxation processes has been noted. The obtained results have been compared with data published previously for sodium alkyl sulfates.