Study of the influence of ionizing radiation onto phase transitions of mixtures of some cholesteric liquid crystals

D. Ž Obadović, M. Stančić, L. Bata, A. Vajda

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

We present the results of the study of binary and multicomponent 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 were 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°C was noticed. The mixture reacts by a change of the color of the mesophase, and according to up - to date following of 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 (d) and the average distance between the long axes of neighboring molecules (D).

Original languageEnglish
Pages (from-to)195-197
Number of pages3
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3319
DOIs
Publication statusPublished - Dec 1 1997
EventLiquid Crystals: Chemistry and Structure - Zakopane, Poland
Duration: Mar 3 1997Mar 8 1997

Keywords

  • Cholesteric liquid crystals
  • Ionizing radiation
  • Molecular parameters
  • Phase transitions
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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