Technical Physics Letters
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Manifestation of the Widom line in microwave measurements of sorbents moistened with hydrogen peroxide
Gurulev A. A.
1, Orlov A. O.
1
1Institute of Natural Resources, Ecology, and Cryology, Siberian Branch, Russian Academy of Sciences, Chita, Russia
Email: lgc255@mail.ru, Orlov_A_O@mail.ru
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 -47oC 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.
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