Open AccessInfluence of pressure and temperature on the attenuation of ultrasound in the nematic phase of the liquid crystal working medium of technical devices in the vicinity of phase transition point
Author(s) -
A. N. Larionov
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/659/1/012078
Subject(s) - liquid crystal , phase transition , attenuation , materials science , phase (matter) , relaxation (psychology) , critical point (mathematics) , condensed matter physics , attenuation coefficient , acoustic attenuation , ultrasound , atmospheric temperature range , transition point , thermodynamics , chemistry , optics , physics , optoelectronics , organic chemistry , psychology , social psychology , mathematical analysis , mathematics , acoustics
The dependence of the attenuation coefficient of ultrasound in the nematic phase on pressure and temperature, which characterizes the parameters of electronic devices with a liquid-crystal working medium in the vicinity of phase transition point, is studied. Liquid crystals and their mixtures with a wide temperature range of the nematic phase were researched. The analysis is performed taking into account the normal relaxation process associated with conformational transitions of the end chains, and the critical relaxation process due to the nature of this phase transition. The nature of the dependence on the pressure and temperature of the normal, critical and classical components of the attenuation coefficient of ultrasound is established.