Abstract
Voltage-current characteristics are reported for several bioequivalent structures with liquid crystalline ordering. Measurements were carried out at different temperatures with or without irradiation by UV light. Three types of structures were studied: (1) a liquid crystalline mixture of Schiff bases (MBBA+EBBA), (2) a eutectic mixture of liquid crystalline cyanobiphenyls, and (3) non-saturated long chain carboxylic acids (e.g., oleic). For systems (1) and (2), characteristic local minima on current-temperature curves were observed, with corresponding temperatures decreasing at higher voltages. Tentative mechanisms are discussed in terms of thermoactivation of traps and liquid crystalline ordering. For systems (1) and (3), thermostimulated currents were clearly increased under the influence of UV-irradiation. This phenomenon was completely absent with system (2), which suggested a possibility of interpretation in terms of bioequivalence of liquid crystalline structures.
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