The European Physical Journal E

, 37:7

Dispersions of multi-wall carbon nanotubes in ferroelectric liquid crystals

  • M. Yakemseva
  • I. Dierking
  • N. Kapernaum
  • N. Usoltseva
  • F. Giesselmann
Regular Article

DOI: 10.1140/epje/i2014-14007-4

Cite this article as:
Yakemseva, M., Dierking, I., Kapernaum, N. et al. Eur. Phys. J. E (2014) 37: 7. doi:10.1140/epje/i2014-14007-4

Abstract.

The electro-optic and dielectric properties of ferroelectric liquid crystal-multi-wall carbon nanotube dispersions were investigated with respect to temperature and nanotube concentration. The main physical properties, such as tilt angle, spontaneous polarization, response time, viscosity, and Goldstone-mode relaxation strength and frequency were studied. While all dispersions exhibit the expected temperature dependencies of their physical properties, their dependence on nanotube concentration is still a controversial discussion in literature, with several contradicting reports. For increasing nanotube concentration we observed a decrease in tilt angle, but an increase in spontaneous polarisation, the latter explaining the enhancement of the bilinear coupling coefficient, and the dielectric relaxation strength. Despite the increase in polarization, the electro-optic response times slow down, which suggests an increase of rotational viscosity along the tilt cone. It is anticipated that the latter also accounts for the observed decrease of the Goldstone-mode relaxation frequency for increasing nanotube concentration.

Graphical abstract

https://static-content.springer.com/image/art%3A10.1140%2Fepje%2Fi2014-14007-4/MediaObjects/10189_2014_9963_Fig1_HTML.jpg

Keywords

Soft Matter: Liquid crystals

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • M. Yakemseva
    • 1
  • I. Dierking
    • 2
  • N. Kapernaum
    • 3
  • N. Usoltseva
    • 1
  • F. Giesselmann
    • 3
  1. 1.Nanomaterials Research InstituteIvanovo State UniversityIvanovoRussia
  2. 2.School of Physics and AstronomyUniversity of ManchesterManchesterUK
  3. 3.Institute of Physical ChemistryUniversity of StuttgartStuttgartGermany