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: Chapter in Book/Report/Conference proceedingConference contribution

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
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsM Tykarska, R Dabrowski, J Zielinski
Pages195-197
Number of pages3
Volume3319
DOIs
Publication statusPublished - 1997
EventLiquid Crystals: Chemistry and Structure - Zakopane, Poland
Duration: Mar 3 1997Mar 8 1997

Other

OtherLiquid Crystals: Chemistry and Structure
CountryPoland
CityZakopane
Period3/3/973/8/97

Fingerprint

Cholesteric liquid crystals
Ionizing radiation
ionizing radiation
Phase transitions
liquid crystals
Temperature
binary mixtures
carbonates
Calorimetry
heat measurement
transition temperature
chlorides
phase diagrams
Phase diagrams
microscopy
Optical microscopy
color
Carbonates
temperature
shift

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Obadović, D. Ž., Stančić, M., Bata, L., & Vajda, A. (1997). Study of the influence of ionizing radiation onto phase transitions of mixtures of some cholesteric liquid crystals. In M. Tykarska, R. Dabrowski, & J. Zielinski (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3319, pp. 195-197) https://doi.org/10.1117/12.301284

Study of the influence of ionizing radiation onto phase transitions of mixtures of some cholesteric liquid crystals. / Obadović, D. Ž; Stančić, M.; Bata, L.; Vajda, A.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / M Tykarska; R Dabrowski; J Zielinski. Vol. 3319 1997. p. 195-197.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Obadović, DŽ, Stančić, M, Bata, L & Vajda, A 1997, Study of the influence of ionizing radiation onto phase transitions of mixtures of some cholesteric liquid crystals. in M Tykarska, R Dabrowski & J Zielinski (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 3319, pp. 195-197, Liquid Crystals: Chemistry and Structure, Zakopane, Poland, 3/3/97. https://doi.org/10.1117/12.301284
Obadović DŽ, Stančić M, Bata L, Vajda A. Study of the influence of ionizing radiation onto phase transitions of mixtures of some cholesteric liquid crystals. In Tykarska M, Dabrowski R, Zielinski J, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3319. 1997. p. 195-197 https://doi.org/10.1117/12.301284
Obadović, D. Ž ; Stančić, M. ; Bata, L. ; Vajda, A. / Study of the influence of ionizing radiation onto phase transitions of mixtures of some cholesteric liquid crystals. Proceedings of SPIE - The International Society for Optical Engineering. editor / M Tykarska ; R Dabrowski ; J Zielinski. Vol. 3319 1997. pp. 195-197
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