Theory of the Ultrasonic Absorption in Aqueous Solutions : (II) Aqueous Solutions of Some Alcohols

概要

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Anomalous parts of the ultrasonic absorption coefficient have been calculated for aqueous solutions of methanol, ethanol and n-propanol as functions of the concentration by employing the result of the general theory described in part (I) of this paper (J. Phys. Soc. Japan 11 (1956) 827), which is based on the assumption that the pressure change of the sound wave accompanies a change in the existence ratio between the single and the associated molecules of water, that there takes place a molecular rearrangement among the single and the associated molecules of water and the solute molecules, accompanying changes in configurational entropy of the system, and that the irreversible entropy production takes place in the stage of energy transfer from the thermal motion to the configurational degree of freedom and vise versa. Calculations have been performed for two simplified model cases: (a) ignoring the difference in sizes of the single water molecule and the solute molecule, and (b) taking into account the difference in sizes of these molecules by approximating them by linear polymers each consisting of one kind of atoms. The value of the absorption peaks and the location of them have been found to be in semi-quantitative agreement with experiments, the agreement being somewhat better in case (b) as compared with (a).
社団法人日本物理学会の論文
1957-03-05