The effect of CoPt-coated reduced-graphene oxide nanosheets upon the Smectic-A to Smectic-C* phase transition of a chiral liquid crystal

Marta Lavrič*, George Cordoyiannis, Vasileios Tzitzios, Samo Kralj, George Nounesis, Ioannis Lelidis, Heinz Amenitsch, Zdravko Kutnjak

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We report on high-resolution calorimetry and small-angle X-ray scattering measurements along the Smectic-A to chiral Smectic-C* phase transition of the liquid crystal 4-(2-methyl butyl) phenyl 4-n-octylbiphenyl-4-carboxylate with dispersed, CoPt nanoparticle-coated reduced-graphene oxide nanosheets. The temperature dependence of heat capacity and smectic layer spacing are obtained in the vicinity of Smectic-A to chiral Smectic-C* phase transition. Though no remarkable pretransitional effects are present, the critical fits show a crossover from mean-field near a tricritical point to classical mean-field compared to pure liquid crystal. The X-ray data yield a dilation of smectic layer thickness, indicating the assembly of graphene oxide nanosheets between the smectic layers.

Original languageEnglish
JournalLiquid Crystals
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • ac calorimetry
  • extended mean-field
  • nanoparticles
  • nanosheets
  • Reduced graphene oxide
  • smectic liquid crystals
  • X-ray scattering

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fields of Expertise

  • Advanced Materials Science

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