Signatures of the appearance of ice 0 in wetted nanoporous media at electromagnetic measurements

Resumo

Ice 0 that is a new modification of crystalline ice, which can be formed only from supercooled water, is sought. To this end, the electric parameters of wetted nanoporous silicates SBA-15 and silica gel (Acros) for obtaining deeply supercooled water in pores are studied. Three electrical parameters of a medium are measured: the reflection coefficient of microwave radiation from the interface between the medium and air in a waveguide at a frequency of 12.4 GHz and the transmittance of radiation at a frequency of 94 GHz, the tangent of the dielectric loss angle at frequencies from 10 Hz to 100 kHz, and the characteristic electrical fluctuations in the frequency band of 1–100 Hz. Studies are performed at cyclic cooling and heating of the samples in the temperature range from + 20 °C to -150 °C. Sharp changes in all three parameters of the wetted silicates are revealed near the temperature range from -20 °C to - 24 °C. These changes can be attributed to the formation or destruction of ferroelectric ice 0.