Features of the transition to the isotropic state of the liquid crystal sensitive element of the gas sensor under the action of acetone vapor

Abstract

The process of detailed research of the transient process, which takes place in the sensitive element of the liquid crystal sensor during interaction with acetone vapors, is described. The abrupt transition of the liquid crystal to the isotropic state is one of the main obstacles which prevents the construction of an acetone liquid crystal sensor. A mixture of nematic liquid crystal E7 and cholesteric impurity CB15 was used as a sensitive element.

Nonlinear features of the transition of a liquid crystalline mixture into an isotropic state under the action of alcohol vapors

“…Analysis of the interaction of alcohols, as large and structurally similar organic molecules with a liquid crystal mixture of a sensitive element, is close to the interaction of a similar sensor with acetone vapors [9].…”

“…The infrared spectrum is not used, due to the much smaller, about one hundred times, intensity obtained, but in general it repeats the typical appearance and characteristic points of the other three components. Other components and the general structure of the hardware part of the sensor are given in [9]…”