DIELECTRIC-RELAXATION OF AQUEOUS-SOLUTION WITH LOW-MOLECULAR-WEIGHT NONELECTROLYTES AND ITS RELATIONSHIP WITH SOLUTION STRUCTURE

Dielectric relaxation of mater molecules was measured in the frequency range from 0.2 to 20 GHz for aqueous solutions of urea, formamide, al cohols, and saccharides. The relaxation behavior was described well by the Debye equation,vith a single relaxation process in most cases. Th e static permittivity of solution and relaxation time of mater in solu tion changed linearly with solute concentration. The relaxation time s hift of mater molecules through the existence of solute was correlated ,veil to the first, virial coefficient of the activity coefficient of water suggesting the close relationship between dielectric relaxation time and aqueous solution structure.