Journal
LIQUID CRYSTALS
Volume 47, Issue 6, Pages 831-837Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2019.1680757
Keywords
Reduced graphene oxide; nanoparticles; nanosheets; X-ray scattering; ac calorimetry; smectic liquid crystals; extended mean-field
Funding
- European Social Fund [THALES Project] [PE3-1535]
- Slovenian Research Agency [P10125]
- European Regional Development Fund
- European Social Fund - Project International Mobility of Researchers in CTU [CZ.02.2.69/0.0/0.0/16_027/0008465]
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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.
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