PREDICTION OF DIELECTRIC PROPERTIES IN OIL‐WATER AND ALCOHOL‐WATER MIXTURES AT 3,000 MHz, 25°C BASED ON PURE COMPONENT PROPERTIES

Measurements of oil-water emulsions show that dielectric properties are predicted at 3,000 MHz, 25°C by the noninteractive Fricke model for complex conductivity of colloidal suspensions. Similar measurements for methanol-water and ethanol-water show that dielectric properties are predicted at 3,000 MHz, 25°C by an empirical combination, designated as the interactive Fricke model, of the noninteractive Fricke model and the Debye models for pure polar liquids with single relaxation times. A tentative physical-chemical basis for prediction of dielectric properties in liquid food systems is suggested, which involves concepts of relative dielectric activities of major chemical constituents, extent of solvation and colloidal content and is based on mechanisms of dielectric behavior observed in aqueous mixtures at microwave frequencies.