Structural transformations of supercooled water in nanopores, studied by microwave radiation

It is shown that the state of supercooled water in nanoporous materials can be studied by measuring the attenuation of microwave radiation. By analyzing variations in the intensity of radiation transmitted through a moistened medium during the supercooling of water in the range of -37 to -190A degrees C, the temperatures at which structural transformations take place can be determined. Using the example of KSKG silica gel with a mean pore size of 8 nm, it is shown that at a moisture of 3-18%, water is found in the liquid state up to a temperature of -130A degrees C, at which the transition to glass occurs.