Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes

• Mateusz Mrukiewicz,
• Krystian Kowiorski,
• Paweł Perkowski,
• Rafał Mazur and
• Małgorzata Djas

Beilstein J. Nanotechnol. 2019, 10, 71–78, doi:10.3762/bjnano.10.7

• -optical performance is doping them with nanoparticles. Hsu et al. showed that the small addition of gold nanoparticles decreases Uth due to the increased electric anisotropy and decreased elastic constant [5]. Haraguchi and collaborators doped the twisted nematic liquid crystal cell with inorganic

• dielectric spectroscopy and electro-optical measurements of the 5CB nematic liquid crystal with various concentrations of GO flakes (0.05–0.3 wt %). The effect of GO was significant. The reduction of the threshold voltage in the thin liquid crystal cell at the concentration of 0.2 wt % is related to the

• a function of time for (a) switch-on (τ90–10) and (b) switch-off (τ10–90) processes for different concentrations of GO flakes in the 5CB liquid crystal compound. Liquid crystal cell filled with graphene oxide (GO) flakes suspended in a thermotropic nematic liquid crystal. The picture presents the

Dynamic behavior of nematic liquid crystal mixtures with quantum dots in electric fields

• Emil Petrescu,
• Cristina Cirtoaje and
• Octavian Danila

Beilstein J. Nanotechnol. 2018, 9, 399–406, doi:10.3762/bjnano.9.39

• than the Fréedericksz transition threshold [18][19] is applied transversely to a planar liquid crystal cell, the molecules change their orientation tending to align their director in parallel to the field. This reorientation is illustrated by an intensity variation of a laser beam crossing through the

Dynamic behavior of a nematic liquid crystal with added carbon nanotubes in an electric field

• Emil Petrescu and
• Cristina Cirtoaje

Beilstein J. Nanotechnol. 2018, 9, 233–241, doi:10.3762/bjnano.9.25

• electric field is applied. Carbon nanotubes in a liquid crystal cell exposed to an electric field. Orientation of a liquid crystal molecule on a CNT surface. Relative orientation of a liquid crystal molecule on a carbon nanotube surface. a) The electric field is applied, b) the electric field is switched

Nematic liquid crystal alignment on subwavelength metal gratings

• Irina V. Kasyanova,
• Artur R. Geivandov,
• Vladimir V. Artemov,
• Maxim V. Gorkunov and
• Serguei P. Palto

Beilstein J. Nanotechnol. 2018, 9, 42–47, doi:10.3762/bjnano.9.6

• , which involves the ion-beam milling technique and assembly of the experimental liquid crystal cell. The second section is dedicated to data analysis, where besides polarized microscope observations, we apply the Fourier transform technique to the transmittance spectra in order to extract the effective

• sample; the arrow on the left indicates the rubbing direction of the top substrate to which the orientation of the grating slit is related. Photos of the liquid crystal cell under polarized light: (a) , the sample axis (rubbing direction) is at 45° to P1 and P2; (b) the enlarged part of photo a, showing

Electro-optical characteristics of a liquid crystal cell with graphene electrodes

• Nune H. Hakobyan,
• Hakob L. Margaryan,
• Valeri K. Abrahamyan,
• Vladimir M. Aroutiounian,
• Arpi S. Dilanchian Gharghani,
• Amalya B. Kostanyan,
• Timothy D. Wilkinson and
• Nelson Tabirian

Beilstein J. Nanotechnol. 2017, 8, 2802–2806, doi:10.3762/bjnano.8.279

• can be successfully used as a transparent conductive layer in LC devices. Keywords: conductive layer; graphene; ITO; liquid crystal cell; optical switching time; Introduction In modern optical devices based on liquid crystals (LCs) the electro-optical control is realized using a transparent

• an electric pulse, namely, a more ordered reorientation of the LC at the initial moment of its action, can be used when forming the control signal shape to improve the operating speed of LC devices. In general, a liquid crystal cell working as a light valve can operate in two modes: fast switching

• make it suitable for successful use as a transparent conductive layer in LC devices. A schematic of the graphene–ITO hybrid liquid crystal cell. Images of the graphene–ITO hybrid liquid crystal (LC) cell between crossed polarizers: voltage not applied (a), peak-to-peak voltage Vpp = 40 V applied to LC

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

• Amanda García-García,
• Ricardo Vergaz,
• José F. Algorri,
• Gianluigi Zito,
• Teresa Cacace,
• Antigone Marino,
• José M. Otón and
• Morten A. Geday

Beilstein J. Nanotechnol. 2016, 7, 825–833, doi:10.3762/bjnano.7.74

• negative LC matrix and the macroscopic impedance of a liquid crystal cell filled with negative LC doped with SWCNTs. In order to separate the field induced switching of the LC and the SWCNTs, a cells with homogenously aligned LC of negative dielectric anisotropy is employed. The SWCNT switching pattern in