Anomalous selective reflection in cholesteryl oleyl carbonate - nematic 5CB mixtures and effects of their doping by single-walled carbon nanotubes

Liquid crystalline (LC) mixtures of cholesteryl oleyl carbonate (COC) and 4-pentyl-4'-cyanobiphenyl (5CB) as well as dispersions of single-walled carbon nanotubes (NTs) in these mixtures were studied by means of selective reflection measurements, differential scanning calorimetry (DSC) and opti...

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Bibliographic Details
Published in:Liquid crystals 2013-07, Vol.40 (7), p.968-975
Main Authors: Lebovka, N. I., Lisetski, L. N., Nesterenko, M. I., Panikarskaya, V. D., Kasian, N. A., Minenko, S. S., Soskin, M. S.
Format: Article
Language:English
Subjects:
5CB
Accounting
carbon nanotubes
Carbonates
cholesteric
cholesteryl oleyl carbonate
Differential scanning calorimetry
Doping
liquid crystal
Liquid crystal polymers
Liquid crystals
Molecules
Nanotubes
Phase transitions
Reflection
selective reflection
Single wall carbon nanotubes
Temperature distribution
Transition temperature
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Summary:Liquid crystalline (LC) mixtures of cholesteryl oleyl carbonate (COC) and 4-pentyl-4'-cyanobiphenyl (5CB) as well as dispersions of single-walled carbon nanotubes (NTs) in these mixtures were studied by means of selective reflection measurements, differential scanning calorimetry (DSC) and optical microscopy. The relative mass of COC in a mixture X was varied between 0.4 and 1.0, the temperature range of measurements was between 284 and 314 K, and concentration of NTs was fixed at 0.1%. Two important anomalies were noted: (1) the cholesteric to smectic-A transition temperature increased on dilution of COC by non-smectogenic 5CB in the concentration range 0.8 
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2013.786796