Electrical modeling of tristate antiferroelectric liquid crystal devices

Zafra, Juan Carlos Torres

doi:10.1117/1.3564817

Cited by 11 publications

(4 citation statements)

References 15 publications

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“…4 b. Here, the EEC model can be defined as the series connection of the following three parts: the part related to the resistance of the electrodes and connectors R CR , the part related to the high frequencies (100 Hz–100 kHz) caused by the reaction of LC molecules to the electric field and characterized by the parallel connection of R LC , the active component and C LC , the reactive component of the bulk of LC 17 , 56 , 57 , and the part associated with low frequencies (100 mHz–100 Hz) which considered the reaction of spaced charges in the vicinity of the electrodes and consists of the parallel connection of C DL , the double layer capacitance and W, finite diffusion Warburg element 57 – 59 . The Warburg element itself consists of two parts: W sr , Warburg coefficient in bulk and W sc , Warburg coefficient in double layer 11 .…”

Section: Resultsmentioning

confidence: 99%

Enhancement in electrical conductivity of liquid crystals by graphene metal oxide composites

Khodaee

Dalir

Feghhi

et al. 2023

Sci Rep

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Enhancing the electrical conductivity of liquid crystal (LC) circumvents challenges for application in advanced electronic components. Toward this, using additives made of different nanostructures that could result in functional LCs is suggested. In this paper, various concentrations of graphene (Gr)/metal-oxide (Fe3O4) nanocomposite (GMN) (0.0001–1 w%) were added to E7 nematic LC. We found that the role of anisotropic Gr flakes, their edges as well as surface-decorated-metal-oxide-additives have significant impact on electrical properties of E7. A range of appropriate additives of such a nanocomposite enhances the electrical conductivity of LCs. This effect can be traced through the decrease in the formation of GMN aggregates in the E7 and increase in the electrostatic field at the edges of the Gr sheets. Moreover, the presence of metal-oxide nanoclusters due to the presence of oxygen vacancies and defects facilitates the construction of conductive network for improving the charge transfer pathways and contributes to a stronger interaction of the Gr surface with charged species. These factors can provide Gr layers as dipole moments and lead to signal propagation in the dielectric medium. Our finding conveys a pathway toward significant enhancement of electrical conductivity in the LC family which can be useful for functional applications.

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Section: Resultsmentioning

confidence: 99%

Enhancement in electrical conductivity of liquid crystals by graphene metal oxide composites

Khodaee

Dalir

Feghhi

et al. 2023

Sci Rep

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show abstract

“…4b. Here, the EEC model can be de ned as the series connection of the following three parts: the part related to the resistance of the electrodes and connectors R CR , the part related to the high frequencies (100 kHz 100 Hz) caused by the reaction of LC molecules to the electric eld and characterized by the parallel connection of R LC , the active component and C LC , the reactive component of the bulk of LC 18,53,54 , and the part associated with low frequencies (100 Hz 100 mHz) which considered the reaction of spaced charges in the vicinity of the electrodes and consists of the parallel connection of C DL , the double layer capacitance and W, nite diffusion Warburg element [54][55][56] .…”

Section: Resultsmentioning

confidence: 99%

Enhancement in ionic conductivity of liquid crystals by graphene/metal-oxide-nanocomposite

Khodaee

Dalir

Feghhi

et al. 2023

Preprint

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Enhancing the ionic conductivity of liquid crystal (LC) circumvents challenges for application in advanced electronic components. Toward this, using additives made of different nanostructures that could result in functional LCs is suggested. In this paper, various concentrations of graphene (Gr)/metal-oxide (Fe3O4) nanocomposite (GMN) (0.0001-1 w%) were added to E7 nematic LC. We found that the role of anisotropic Gr flakes, their edges as well as surface-decorated-metal-oxide-additives have significant impact on electrical properties of E7. A range of appropriate additives of such a nanocomposite enhances the electrical conductivity of LCs. This effect can be traced through the decrease in the formation of GMN aggregates in the E7 and increase in the electrostatic field at the edges of the Gr sheets. Moreover, the presence of metal-oxide nanoclusters due to the presence of oxygen vacancies and defects facilitates the construction of conductive network for improving the charge transfer pathways and contributes to a stronger interaction of the Gr surface with charged species. These factors can provide Gr layers as dipole moments and lead to signal propagation in the dielectric medium. Our finding conveys a pathway toward significant enhancement of ionic conductivity in the LC family which can be useful for functional applications.

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“…Several equivalent electrical circuits have been reported [19–20] describing the behavior of LC cells under different circumstances. In our case it is intended to employ a simple EEC where every contribution of LC, CNTs, and electric circuitry may be associated, if possible, to a single component.…”

Section: Electrical Description Of the Systemmentioning

confidence: 99%

Electrical response of liquid crystal cells doped with multi-walled carbon nanotubes

García-García¹,

Vergaz²,

Algorri³

et al. 2015

Beilstein J. Nanotechnol.

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SummaryThe inclusion of nanoparticles modifies a number of fundamental properties of many materials. Doping of nanoparticles in self-organized materials such as liquid crystals may be of interest for the reciprocal interaction between the matrix and the nanoparticles. Elongated nanoparticles and nanotubes can be aligned and reoriented by the liquid crystal, inducing noticeable changes in their optical and electrical properties. In this work, cells of liquid crystal doped with high aspect ratio multi-walled carbon nanotubes have been prepared, and their characteristic impedance has been studied at different frequencies and excitation voltages. The results demonstrate alterations in the anisotropic conductivity of the samples with the applied electric field, which can be followed by monitoring the impedance evolution with the excitation voltage. Results are consistent with a possible electric contact between the coated substrates of the LC cell caused by the reorientation of the nanotubes. The reversibility of the doped system upon removal of the electric field is quite low.

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Electrical modeling of tristate antiferroelectric liquid crystal devices

Cited by 11 publications

References 15 publications

Enhancement in electrical conductivity of liquid crystals by graphene metal oxide composites

Enhancement in electrical conductivity of liquid crystals by graphene metal oxide composites

Enhancement in ionic conductivity of liquid crystals by graphene/metal-oxide-nanocomposite

Electrical response of liquid crystal cells doped with multi-walled carbon nanotubes

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