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Reorientation of single-wall carbon nanotubes in negative anisotropy liquid crystals by an electric field

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ABSTRACT

Single-wall carbon nanotubes (SWCNT) are anisotropic nanoparticles that can cause modifications in the electrical and electro-optical properties of liquid crystals. The control of the SWCNT concentration, distribution and reorientation in such self-organized fluids allows for the possibility of tuning the liquid crystal properties. The alignment and reorientation of CNTs are studied in a system where the liquid crystal orientation effect has been isolated. Complementary studies including Raman spectroscopy, microscopic inspection and impedance studies were carried out. The results reveal an ordered reorientation of the CNTs induced by an electric field, which does not alter the orientation of the liquid crystal molecules. Moreover, impedance spectroscopy suggests a nonnegligible anchoring force between the CNTs and the liquid crystal molecules.

No MeSH data available.


Impedance magnitude and phase measurements of (a) undoped and (b) SWCNT-doped LC cells.
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Figure 7: Impedance magnitude and phase measurements of (a) undoped and (b) SWCNT-doped LC cells.

Mentions: Thus, as not all the SWCNTs recover to the planar alignment, the system behavior is not fully reversible from a macroscopic point-of-view. The impedance measurements are in accordance with this fact. The undoped LC cell shows invariable impedance behavior with the applied electric field (Fig. 7) because the LC molecules do not change their position, and there is not any change of their effective dielectric permittivity.


Reorientation of single-wall carbon nanotubes in negative anisotropy liquid crystals by an electric field
Impedance magnitude and phase measurements of (a) undoped and (b) SWCNT-doped LC cells.
© Copyright Policy - Beilstein
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4979768&req=5

Figure 7: Impedance magnitude and phase measurements of (a) undoped and (b) SWCNT-doped LC cells.
Mentions: Thus, as not all the SWCNTs recover to the planar alignment, the system behavior is not fully reversible from a macroscopic point-of-view. The impedance measurements are in accordance with this fact. The undoped LC cell shows invariable impedance behavior with the applied electric field (Fig. 7) because the LC molecules do not change their position, and there is not any change of their effective dielectric permittivity.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Single-wall carbon nanotubes (SWCNT) are anisotropic nanoparticles that can cause modifications in the electrical and electro-optical properties of liquid crystals. The control of the SWCNT concentration, distribution and reorientation in such self-organized fluids allows for the possibility of tuning the liquid crystal properties. The alignment and reorientation of CNTs are studied in a system where the liquid crystal orientation effect has been isolated. Complementary studies including Raman spectroscopy, microscopic inspection and impedance studies were carried out. The results reveal an ordered reorientation of the CNTs induced by an electric field, which does not alter the orientation of the liquid crystal molecules. Moreover, impedance spectroscopy suggests a nonnegligible anchoring force between the CNTs and the liquid crystal molecules.

No MeSH data available.