Measurements of velocity and absorption of ultrasonic waves in aqueous solutions of α- and β-cyclodextrin (chemical compounds which are able to form inclusion complexes) with some surfactants were carried out at different temperatures and concentrations. The frequency range from 1 MHz to 150 MHz was covered by resonator and pulse methods. On the ground of these measurements, according to the principles of ultrasonic spectroscopy, the occurrence of one or two ultrasonic relaxation processes has been established. Explanation of the molecular origins of the relaxation processes has been proposed.
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