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Proceedings Paper

Influence of ionizing radiation onto phase transitions of mixtures of some cholesteric liquid crystals
Author(s): D. Z. Obadovic; M. Stancic; L. Bata; A. Vajda
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Paper Abstract

We present the results of the study of binary and multicomponents mixtures of cholesteryl oleyl carbonate with cholesteryl nonanoate, benzoate and cholesteryl chloride. The study was undertaken with the aim of forming the system with the temperature of the phase transition close to the room temperature, which could be suitable for the detection of the ionizing radiation. The phase diagrams were established on the basis of data from the optical microscopy and DS calorimetry. The mixtures wee exposed to the action of the continual spectrum of x-radiation in the period of 30/60 min. and a shift of the temperature of the phase transition towards lower temperatures in the range of 3-5 degrees C was noticed. The mixture reacts by a change of the color of the mesophase, and according to up-to-date following the results, the duration of the effects exceeds six months. Using x-ray diffraction on the crystalline powder of unoriented samples, we have determined the molecular parameters: the thickness the cholesteric layers and the average distance between the long axes of neighboring molecules.

Paper Details

Date Published: 1 January 1998
PDF: 3 pages
Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); doi: 10.1117/12.301284
Show Author Affiliations
D. Z. Obadovic, Institute of Physics (FR Yugoslavia)
M. Stancic, Faculty of Engineering M. Pupin (Serbia)
L. Bata, Research Institute for Solid State Physics (Hungary)
A. Vajda, Research Institute for Solid State Physics (Hungary)

Published in SPIE Proceedings Vol. 3319:
Liquid Crystals: Chemistry and Structure
Marzena Tykarska; Roman S. Dabrowski; Jerzy Zielinski, Editor(s)

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