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The present research deals with the registration and study of temperature andultrasound parameters of non-equilibrium phase transitions occurring in thelayer "liquid-solid surface" in the process of slow heating and cooling of themedium. Different resistive sensors have been used for taking measurements. Asa result there has been discovered a periodic stepped dependence of theregistered temperature with jumps ~7.5-13 K in water, water solutions and otherliquids. We have studied the conditions under which the stepped temperaturedependence of the resistive sensors indications is synchronous to the resonancefrequency variations of the liquid volume limited by the surface of the axialpiezoelectric resonator. The experiments showed that for studying temperaturetransitions and ultrasound phase velocity variations the following conditionsare required: ac field in the area of the liquid surface layer. Assumed causeof the temperature jumps occurrence is high heat conduction and heat capacityof the surface-bound layer, causing local temperature variations on the surfaceof the resistive sensor in the process of evolution of the two-dimensionalcrystal liquid structure. Investigation of non-equilibrium transitions of thesurface-bound liquid layer may be of interest for studying molecular complexesof liquid media, as well as cellular structures of living systems.

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