Analysis of Loss Factor of Supercooled Pore Water at Frequencies of 60–140 GHz

Abstract

Loss factor of supercooled pore water is studied at frequencies of 60–140 GHz at temperatures of down to –70°C using silica gel. It is shown that, with disregard of the effect of monomolecular nonfreezing layer of bound water, the loss factor of pore water in the silicate material is determined by the Debye relaxation of water corresponding to the properties of bulk water, additional loss in a temperature interval centered at ‒45°C owing to the effect of the second critical point of water, and the surface conduction at the interface due to the formation of ferroelectric ice 0 provided that the freezing point of water in pores is lower than ‒23°C. The experimental results can be used in the problems of radiation transfer in aerosols and porous wetted finely dispersed media.