Thermally stimulated depolarization currents and optical transmission on liquid crystal/cellulose derivative composite devices

C. Rosu, D. Manaila-Maximean, M. H. Godinho, P. L. Almeida

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In this paper we examined the electrical and optical properties of a new composite device containing layers of a nematic liquid crystal and cellulose derivative. Using the thermally stimulated depolarization current (TSDC) method we obtained information regarding the conduction mechanism, the activation energy, and the pre-exponential frequency factor in the Arrhenius diagrams. The optical transmission is slightly dependent on the polarization field, and the thermal switch behavior was obtained at the nematic-isotrop transition. When a.c. voltage is applied to the sample, the optical transmission depends strongly on the field amplitude, and a very good contrast is obtained.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalMolecular Crystals and Liquid Crystals
Volume391
Issue number1
DOIs
Publication statusPublished - 2003

Keywords

  • Activation energy
  • Cellulose
  • Nematic liquid crystals
  • Optical transmission
  • Thermally stimulated depolarization currents

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