Enhanced negative dielectric anisotropy and high electrical conductivity of the SWCNT doped nematic liquid crystalline material

Vimal, Tripti; Pandey, Shivani; Gupta, Swadesh Kumar; Singh, Dharmendra Pratap

doi:10.1016/j.molliq.2014.11.014

Cited by 28 publications

(6 citation statements)

References 18 publications

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“…Other dynamic measurements performed on similar systems [25–26] confirm this faster response. Other publications [27–30] show the influence of the addition of nanotubes on the dielectric properties of the sample. In [27,29], Basu and co-workers clearly explained that the increase of dielectric anisotropy is strongly related to the anchoring forces.…”

Section: Resultsmentioning

confidence: 99%

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

Petrescu¹,

Cîrtoaje²

2018

Beilstein J. Nanotechnol.

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The dynamic behavior of a nematic liquid crystal with added carbon nanotubes (CNTs) in an electric field was analyzed. A theoretical model based on elastic continuum theory was developed and the relaxation times of nematic liquid crystals with CNTs were evaluated. Experiments made with single-walled carbon nanotubes dispersed in nematic 4-cyano-4’-pentylbiphenyl (5CB) indicated a significant difference of the relaxation time when compared to pure liquid crystal. We also noticed that the relaxation time when the field is switched off depends on how long the field was applied. It is shorter when the field is switched off immediately after application and longer when the field was applied for at least one hour.

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Section: Resultsmentioning

confidence: 99%

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

Petrescu¹,

Cîrtoaje²

2018

Beilstein J. Nanotechnol.

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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%

“…The electrical properties of liquid crystals doped with carbon nanotubes (CNT) were explored in numerous papers [105,116,. The majority of these manuscripts [105,116,117,[128][129][130][131][132][133][134][135][136][137][138][139][140][141][142] report the enhancement of the electrical conductivity  of liquid crystals doped with carbon nanotubes. The increase in  is associated with the percolation phenomenon and high intrinsic electrical conductivity of carbon nanotubes: a sharp transition from the ionic conductivity to the dominating charge hopping conductivity occurs at a certain concentration called the percolation concentration [105,116].…”

Section: Carbon-based Nano-objects In Liquid Crystalsmentioning

confidence: 99%

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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“…Various research reveals that nanomaterials play an important role in altering and improving the properties of LC molecules. A large number of LC-nanomaterial composites have been prepared and studied extensively to understand the effect of nanomaterials on the physical and chemical properties of LCs. ,− Dopants like quantum dots of CdSe, carbon, nanoparticles of BaTiO 3 , silver, gold, MgO, and single and multiwall carbon nanotubes were used. , Paul et al doped 0.5 wt % BaTiO 3 nanopowder in 6CHBT which led to a decrease in I–N transition and enthalpy value . Tripathi et al doped 0.6 wt % Silver nanoparticles of 5 and 100 nm size in 6CHBT LC and observed a nominal increase in I–N transition temperature and marginal decrease in dielectric anisotropy .…”

Section: Introductionmentioning

confidence: 99%

Gold Nanorod-Induced Effects in a Mesogenic Compound 4-(trans-4-n-Hexylcyclohexyl) isothiocyanatobenzene

Lal,

Verma,

Chirra

et al. 2023

ACS Omega

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Gold nanorods (GNRs) have a capsule-like structure with different optical properties than spherical gold nanoparticles due to surface plasmon resonance. Liquid crystals (LCs) are mesogenic compounds having crystal-like orientation and liquid-like fluidity. They are important materials from a technological point of view. Both GNRs and LC compounds are anisotropic in shape and properties. Different nano entities show interesting results when dispersed in different liquid crystalline materials which are instrumental from the application point of view. In the present work, GNRs have been dispersed in nematic liquid crystalline materials, namely 4-(trans-4-n-hexylcyclohexyl) isothiocyanatobenzene (6CHBT). Calorimetric, texture, spectroscopic, and dielectric studies were carried out for a pure 6CHBT and its composites with GNRs. Different calorimetric and dielectric parameters such as transition temperature, enthalpy, heat flow, permittivity, dielectric strength, dielectric anisotropy, and relaxation frequency have been determined, and the effect of GNRs has been explored. This article gives an insight into the influence of GNRs on the morphology and anisotropic physical properties of the nematic liquid crystalline material.

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Enhanced negative dielectric anisotropy and high electrical conductivity of the SWCNT doped nematic liquid crystalline material

Cited by 28 publications

References 18 publications

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

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

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

Gold Nanorod-Induced Effects in a Mesogenic Compound 4-(trans-4-n-Hexylcyclohexyl) isothiocyanatobenzene

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