Accession Number : AD0618409

Title :   THE DIELECTRIC SPECTRA OF WATER-ETHANOL MIXTURES IN THE MICROWAVE REGION,

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE LAB FOR INSULATION RESEARCH

Personal Author(s) : BUCK,Douglas E.

Report Date : JUN 1965

Pagination or Media Count : 20

Abstract : The dielectric constant and loss were measured at 8.5, 3.0, 1.0, and 0.3 kMc/sec for solutions of ethanol and water as a function of concentration and temperature. The mixtures exhibit a distribution of relaxation times as opposed to single time constants for the pure components. The distribution of time constants was resolved as the superposition of two dispersions, each having a single time constant. The intensity and time constant of the two dispersions were found as a function of temperature and concentration and explained in terms of a mechanism in which hydrogen bonds are broken and allowed to reorient. In addition, the dielectric constant and loss were measured for water from 5 to-5C, and no abnormal behavior was noted at 4C or in the supercooled state. (Author)

Descriptors :   (*DIELECTRICS, MICROWAVE SPECTROSCOPY), (*WATER, DIELECTRIC PROPERTIES), (*ALCOHOLS, DIELECTRIC PROPERTIES), (*MICROWAVE SPECTROSCOPY, DIELECTRICS), MIXTURES, RELAXATION TIME, MOLECULAR ASSOCIATION, SUPERCOOLING, ICE, DIPOLE MOMENTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE