Phase separation effects and the nematic-isotropic transition in polymer and low molecular weight liquid crystals doped with nanoparticles

M.V. Gorkunov, Georgiy A. Shandryuk, Alina M. Shatalova, Irina Yu Kutergina, Alexey S. Merekalov, Yaroslav V. Kudryavtsev, Raisa V. Talroze, Mikhail Osipov

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Abstract

Properties of the nematic–isotropic phase transition in polymer and low molecular weight liquid crystals doped with nanoparticles have been studied both experimentally and theoretically in terms of molecular mean-field theory. The variation of the transition temperature and the transition heat with the increasing volume fraction of CdSe quantum dot nanoparticles in copolymer and low molecular weight nematics has been investigated experimentally and the data are interpreted using the results of the molecular theory which accounts for a possibility of phase separation when the system undergoes the nematic–isotropic transition. The theory predicts that the nematic and isotropic phases with different concentrations of nanoparticles may coexist over a broad temperature range, but only if the nanoparticle volume fraction exceeds a certain threshold value which depends on the material parameters. Such unusual phase separation effects are determined by the strong interaction between nanoparticles and mesogenic groups and between nanoparticles themselves.
Original languageEnglish
Pages (from-to)3578-3588
Number of pages11
JournalSoft Matter
Volume9
Early online date20 Feb 2013
DOIs
Publication statusPublished - 2013

Keywords

  • phase separation
  • nematic-isotropic transition
  • doped
  • nanoparticles
  • polymer
  • low molecular weight
  • liquid crystals

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    Gorkunov, M. V., Shandryuk, G. A., Shatalova, A. M., Kutergina, I. Y., Merekalov, A. S., Kudryavtsev, Y. V., Talroze, R. V., & Osipov, M. (2013). Phase separation effects and the nematic-isotropic transition in polymer and low molecular weight liquid crystals doped with nanoparticles. Soft Matter, 9, 3578-3588. https://doi.org/10.1039/C3SM27467E