Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes

Dolgov, L.; Yaroshchuk, O.; Tomylko, S.; Lebovka, Nikolaï

doi:10.5488/cmp.15.33401

Cited by 29 publications

(19 citation statements)

References 16 publications

(22 reference statements)

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“…Interestingly enough, it has been recently found [33,34] that CNT mixtures in LCs with negative dielectric anisotropy are reversible upon switching, at least for low CNT concentrations.…”

Section: Bode Plotsmentioning

confidence: 99%

The peculiar electrical response of liquid crystal-carbon nanotube systems as seen by impedance spectroscopy

García-García¹,

Vergaz²,

Algorri³

et al. 2015

J. Phys. D: Appl. Phys.

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Conductive nanoparticles, especially elongated ones such as carbon nanotubes, dramatically modify the electrical behavior of liquid crystal cells. These nanoparticles are known to reorient with liquid crystals in electric fields, causing significant variations of conductivity at minute concentrations of tens or hundreds ppm. The above notwithstanding, impedance spectroscopy of doped cells in the frequency range customarily employed by liquid crystal devices, 100 Hz-10kHz, shows a relatively simple resistor/capacitor response where the components of the cell can be univocally assigned to single components of the electrical equivalent circuit. However, widening the frequency range up to 1 MHz or beyond reveals a complex behavior that cannot be explained with the same simple EEC. Moreover, the system impedance varies with the application of electric fields, their effect remaining after removing the field. Carbon nanotubes are reoriented together with liquid crystal reorientation when applying voltage, but barely reoriented back upon liquid crystal relaxation once the voltage is removed. Results demonstrate a remarkable variation in the impedance of the dielectric blend formed by liquid crystal and carbon nanotubes, the irreversible orientation of the carbon nanotubes and possible permanent contacts between electrodes.

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“…Interestingly enough, it has been recently found [33,34] that CNT mixtures in LCs with negative dielectric anisotropy are reversible upon switching, at least for low CNT concentrations.…”

Section: Bode Plotsmentioning

confidence: 99%

The peculiar electrical response of liquid crystal-carbon nanotube systems as seen by impedance spectroscopy

García-García¹,

Vergaz²,

Algorri³

et al. 2015

J. Phys. D: Appl. Phys.

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“…Electro-optical memory effect was observed in EBBA + MWCNT suspensions [13,187,188]. The initial orientation of LC with Δε < 0 was homeotropic before the action of the electric field.…”

Section: Electro-optical Applications and Memory Effectsmentioning

confidence: 86%

Carbon Nanotubes in Liquid Crystals: Fundamental Properties and Applications

Lisetski

Soskin

Lebovka

2015

Springer Proceedings in Physics

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The structure and properties of liquid crystalline suspensions filled by carbon nanotubes (CNTs) are critically reviewed. Special attention is paid to interactions between CNTs and molecules of the liquid crystals (LC), which lead to formation of ordered supramolecular structures. These structures, in turn, determine unique physical properties of LC + CNT suspensions, including electrical conductivity, dielectric permittivity, phase transitions, optical transmission, memory effects that can be used in electrooptic and optoelectronic devices, etc. Great variety of LC phases are considered as a host media, such as nematics, cholesterics, smectics of different types (including ferroelectrics), lyotropic, chromonic, ionic and hydrogen-bonded liquid crystals. Alongside multi-and single-walled carbon nanotubes, the suspensions can also contain the platelets of organoclays used for facilitation of CNT dispersing. Recent practical applications of LC + CNT suspensions and nanomaterials based thereon are also outlined.

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“…The approaches to improvement of dispersing of CNTs in LC hosts known today can be conventionally divided into physical and chemical. The physical approaches include optimization of LC materials and mixing conditions [17], in situ electro-hydrodynamic (EHD) dispergation [18,19] and debundling of CNTs in high electric fields [20]. The chemical approaches involve chemical attaching of various fragments to CNTs via covalent bonding [21], p-p stacking interaction [22], etc.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal suspensions of carbon nanotubes assisted by organically modified Laponite nanoplatelets

Yaroshchuk

Tomylko

Koval’chuk

et al. 2014

Carbon

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Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes

Cited by 29 publications

References 16 publications

The peculiar electrical response of liquid crystal-carbon nanotube systems as seen by impedance spectroscopy

The peculiar electrical response of liquid crystal-carbon nanotube systems as seen by impedance spectroscopy

Carbon Nanotubes in Liquid Crystals: Fundamental Properties and Applications

Liquid crystal suspensions of carbon nanotubes assisted by organically modified Laponite nanoplatelets

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