Alignment of single-walled carbon nanotubes in polymer dispersed liquid crystals

Filpo, Giovanni De; Siprova, Svetlana; Chidichimo, Giuseppe; Машин, А. И.; Nicoletta, Fiore Pasquale; Cupelli, Daniela

doi:10.1080/02678292.2011.639908

Cited by 40 publications

(11 citation statements)

References 24 publications

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“…These effects are more pronounced at lower CNTs concentrations. [18][19][20] Similarly, CNTs when doped in FLCs gave rise to many interesting electro-optical properties, but poor dispersibility remained unsolved.…”

Section: Introductionmentioning

confidence: 99%

Influence of single-wall carbon nanotubes on Langmuir–Blodgett films of ferroelectric liquid crystals as studied by atomic force microscopy

Kaur

Raina

2014

Liquid Crystals

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Langmuir-Blodgett films of ferroelectric liquid crystal (LC) doped with low concentration of single-wall carbon nanotubes have been prepared and characterised. Pressure-area isotherms show that the films are stable and have good spreading properties. The interaction between nanotubes and LC molecules in the monolayer was increased during barrier compression, resulting in increased surface pressure. We observed phase change with increasing nanotube concentration in ferroelectric LC matrix. Atomic force microscopy profiles indicate uniform deposition of material on single crystal silicon wafer.

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Section: Introductionmentioning

confidence: 99%

Influence of single-wall carbon nanotubes on Langmuir–Blodgett films of ferroelectric liquid crystals as studied by atomic force microscopy

Kaur

Raina

2014

Liquid Crystals

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“…Besides, the encapsulation of monomer molecules in LC droplets to control the orientation of LC directors by photopolymerization of monomer performed in a magnetic or electric field was also employed . Further, for preparation and performance augmentation of reverse mode PDLCs, polymer stabilized cholesteric texture, electrode roughness, use of surfactants, and modifications of surface energy are also reported.…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

Sharma

Kumar

Chinky

et al. 2019

J of Applied Polymer Sci

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Reported herein, the preparation, morphological, and electrooptic (EO) characterization of reverse mode polymer dispersed liquid crystals (PDLCs) with nematic liquid crystal (LC) and UV curable polymer optical adhesive using polymerization induced phase separation method. The PDLCs are switchable between transparent and opaque states due to the homeotropic and planar alignment of LC in their OFF and ON states of applied voltage, respectively. Further, effect of doping of a fixed concentration of azo dye and silica nanoparticles (NPs) on morphological, EO and response characteristics of same PDLC sample was also analyzed. Experimental results showed that doped reverse mode PDLCs have the higher OFF state optical transmission and boost up in the scattering ON state compared with pristine reverse mode PDLC. The phenomenon is also supported by extinction coefficient and absorption study based on Beer's law. The threshold and operating voltages were found reduced ~1.56 and ~1.73 times for NPs and (NPs + dye) doped reverse mode PDLCs, respectively, along with better contrasts to the pristine reverse mode PDLC. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48745.

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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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Alignment of single-walled carbon nanotubes in polymer dispersed liquid crystals

Cited by 40 publications

References 24 publications

Influence of single-wall carbon nanotubes on Langmuir–Blodgett films of ferroelectric liquid crystals as studied by atomic force microscopy

Influence of single-wall carbon nanotubes on Langmuir–Blodgett films of ferroelectric liquid crystals as studied by atomic force microscopy

Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

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

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