Structures of water and primary alcohol studied by microwave dielectric analyses

摘要

By the use of the time domain reflectometry method dielectric measurements were carried out first on methanol mixtures with ethanol and 1hyphen;propanol, and second, water mixtures with methanol, ethanol and 1hyphen;propanol in the frequency range 10 MHzndash;20 GHz. The first mixtures show a Debye relaxation and logarithm of the relaxation time is given by a linear function of the mole fraction of methanol. These mixtures have the same chainlike cluster of pure alcohol. The second mixtures show the same trend of the relaxation time in a region 0le;xw0.83, wherexwis the mole fraction of water. In a region 0.83xwle;1.0, we observe an entirely different behavior, which indicates that the cluster of pure water appears forxw0.83 and that the cluster must be cyclic, consisting of six molecules.