Dielectric and Electro-Optical Properties of Liquid Crystals Doped with Diamond Nanoparticles

Tomylko, S.; Yaroshchuk, O.; Koval’chuk, A. V.; Maschke, Ulrich; Yamaguchi, Rumiko

doi:10.1080/15421406.2011.569658

Cited by 40 publications

(37 citation statements)

References 21 publications

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“…Table 2 provides a short summary of the reported effects. As can be seen, both decrease [118,119,[121][122][123][124][125][126][127][143][144][145][146][147][148][149][150][151][152] and increase [105,120,[128][129][130][131][132][133][134][135][136][137][138][139][140][141][142][150][151][152][153] in the electrical conductivity of liquid crystals doped with carbon-based nanomaterials were reported.…”

Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

“…%) were reported in [151,152]. It was found that diamond nanoparticles (DNPs) decrease the electrical conductivity  of low-resistivity liquid crystals such as E7.…”

Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

“…It was found that diamond nanoparticles (DNPs) decrease the electrical conductivity  of low-resistivity liquid crystals such as E7. At the same time, DNPs increase  of the high resistivity liquid crystals (MLC6609 or purified E7) [151,152]. The concentration dependence of the electrical conductivity is very nonlinear, pointing to the manifestation of some percolation processes [152].…”

Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

“…The concentration dependence of the electrical conductivity is very nonlinear, pointing to the manifestation of some percolation processes [152]. The observed results were explained by considering different ratios of the ion adsorption / ion desorption at the nanoparticle's surface: the desorption of ions from the surface of DNPs with the ion transfer along the surface of interconnected particles leads to the increase in the electrical conductivity, while the adsorption of ions at the nanoparticle's surface accounts for the decrease in electrical conductivity [151,152].…”

Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

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Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

2015

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Abstract:The presence of ions in liquid crystals is one of the grand challenges that hinder the application of liquid crystals in various devices, which include advanced 3-D and flexible displays, tunable lenses, etc. Not only do they compromise the overall performance of liquid crystal devices, ions are also responsible for slow response, image sticking, and image flickering, as well as many other negative effects. Even highly purified liquid crystal materials can get contaminated during the manufacturing process. Moreover, liquid crystals can degrade over time and generate ions. All of these factors raise the bar for their quality control, and increase the manufacturing cost of liquid crystal products. A decade of dedicated research has paved the way to the solution of the issues mentioned above through merging liquid crystals and nanotechnology. Nano-objects (guests) that are embedded in the liquid crystals (hosts) can trap ions, which decreases the ion concentration and electrical conductivity, and improves the electro-optical response of the host. In this paper, we (i) review recently published works reporting the effects of nanoscale dopants on the electrical properties of liquid crystals; and (ii) identify the most promising inorganic and organic nanomaterials suitable to capture ions in liquid crystals.

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Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

“…%) were reported in [151,152]. It was found that diamond nanoparticles (DNPs) decrease the electrical conductivity  of low-resistivity liquid crystals such as E7.…”

Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

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Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

2015

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“…Being based on the results of the analysis of sample morphology, it can be vastly explained greater aggregates of nanoparticles Fe 2 O 3 than the LiNbO 3 aggregates. Like to that in the work [10], as the main mechanism for reducing the conductance when introducing nanoparticles, we can consider adsorption of ions, which liquid crystal contains, and that are responsible for charge transfer on the Fe 2 O 3 and LiNbO 3 nanoparticles. Since the aggregates of Fe 2 O 3 nanoparticles is much larger (here the surface area is small) than the LiNbO 3 aggregates, then adsorption of ions on them occurs less effectively.…”

Section: The Impact Of Nanoparticles On the Dielectric Properties Of Nlcmentioning

confidence: 99%

Multiferroic based on nematic liquid crystal and nanoparticles

Koval’chuk¹

2016

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Multiferroics stable in morphological parameters has been created by introducing ferromagnetic (Fe 2 O 3 ) and ferroelectric (LiNbO 3 ) nanoparticles with the concentration 0.3 wt.% into nematic liquid crystal 6СНВТ. Being based on the analysis of photos obtained in nonpolarized light of optical microscope, it has been shown that the average sizes of irregular geometric shape of aggregates of Fe 2 O 3 nanoparticles range unities of micrometers and are one order higher than spherical aggregates of LiNbO 3 nanoparticles. It has been shown that low-frequency dispersion of components for the complex permittivity is caused by near-electrode processes. The mechanism of this relaxation process has been ascertained, and its parameters for some of the samples have been determined. It has been shown that when introducing the nanoparticles the conductance of liquid crystal decreases, which may be caused by adsorption of ions (that carry charge through the liquid crystal) on the surface of the nanoparticles.

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