1203.2333 (V. A. Shulgin)

Ultrasound and Temperature Study of Non-Equilibrium Phase Transitions in
Surface-Bound Liquid Layers    [PDF]

V. A. Shulgin

The present research deals with the registration and study of temperature and ultrasound parameters of non-equilibrium phase transitions occurring in the layer "liquid-solid surface" in the process of slow heating and cooling of the medium. Different resistive sensors have been used for taking measurements. As a result there has been discovered a periodic stepped dependence of the registered temperature with jumps ~7.5-13 K in water, water solutions and other liquids. We have studied the conditions under which the stepped temperature dependence of the resistive sensors indications is synchronous to the resonance frequency variations of the liquid volume limited by the surface of the axial piezoelectric resonator. The experiments showed that for studying temperature transitions and ultrasound phase velocity variations the following conditions are required: ac field in the area of the liquid surface layer. Assumed cause of the temperature jumps occurrence is high heat conduction and heat capacity of the surface-bound layer, causing local temperature variations on the surface of the resistive sensor in the process of evolution of the two-dimensional crystal liquid structure. Investigation of non-equilibrium transitions of the surface-bound liquid layer may be of interest for studying molecular complexes of liquid media, as well as cellular structures of living systems.

View original: http://arxiv.org/abs/1203.2333