Manifestation of the Widom line in microwave measurements of sorbents moistened with hydrogen peroxide

A. A. Gurulev, A. O. Orlov

Institute of Natural Resources, Ecology and Cryology of the Siberian Branch of the RAS, Chita, Russia

Abstract: For deeply supercooled bulk water, known are anomalies of thermodynamic quantities near the Widom line, the locus of increased fluctuations of entropy and density. In this work, we measured the reflected power of microwave radiation at the frequency of 18 GHz from a silicate sorbent sample moistened with a hydrogen peroxide solution. In the experiment, we observed variations in the recorded reflected radiation power in the range of -46 to -47$^\circ$C determined by structural changes in the liquid. Thus, it is shown that fluctuations of water parameters near the Widom line manifest themselves in changes not only in thermodynamic, but also in electrophysical quantities.

Keywords: Widom line, second critical point, nanoporous materials, hydrogen peroxide, microwaves.

Received: 18.08.2021
Revised: 06.10.2021
Accepted: 14.10.2021

DOI: 10.21883/PJTF.2022.02.51921.18995

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