Carbon Nanotube Effects on Electro-Optic Characteristics of Twisted Nematic Liquid Crystal Cells

Jo, Eun Mi; Srivastava, Anoop Kumar; Bae, Jung Jun; Kim, Miyoung; Lee, Myong‐Hoon; Lee, Hee Kyu; Lee, Seung‐Eun; Lee, Seung Hee; Lee, Young Hee

doi:10.1080/15421400802612482

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…As a result, a maximum value (0.77) has been attained when co-using red 60 dye and nanotube dopants in the liquid crystal E63. This result is a confirmation of well alignment of CNTs with LC director (21).…”

Section: Resultssupporting

confidence: 84%

Alignment and Reorientation in Nematic Liquid Crystals Doped with Red Dye and Carbon Nanotube

Kaya

Akkurt

Alicilar

2011

Fullerenes, Nanotubes and Carbon Nanostructures

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Four different dyes (Methyl red, Disperse red 1, 13 and 60) were separately doped to each of four different nematic liquid crystals (E7, E8, E63 and ZLI-1132). Their solubilities, textures, phase transition temperatures and order parameters were determined. At the second stage, single-walled nanotubes in a small amount were separately added to each of these solutions, and the experiments were repeated as similar to previous ones. The solubility of dyes was sufficient for using in experiments. When adding dyes and nanotubes, an appreciable change in textures of liquid crystals was not observed. The phase transition temperatures stayed within the limitations required. The changes observed in order parameters depending on the voltage were very small. The highest value of order parameter (0.77) was attained when co-using red 60 dye and nanotube as dopants in the liquid crystal E63.

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Section: Resultssupporting

confidence: 84%

Alignment and Reorientation in Nematic Liquid Crystals Doped with Red Dye and Carbon Nanotube

Kaya

Akkurt

Alicilar

2011

Fullerenes, Nanotubes and Carbon Nanostructures

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“…Rahman and Lee, however, found that the threshold decreases by ∼50% for high load factor of CNT, but hardly altered the dynamics. For a Merck LC mixture, while there was hardly any change or at best a small decrease for the MWCNT doped systems, with SWCNT doping a clear increase was seen in V th . Using two commercially available liquid crystals, including the eutectic mixture E7 used here and DC bias for reorientation, Schymura and Scalia reported a slight increase in V th and a small reduction in d C /d V when CNTs (SWCNTs or MWCNTs) were added to the LC.…”

Section: Introductionmentioning

confidence: 83%

“…For a Merck LC mixture, while there was hardly any change or at best a small decrease for the MWCNT doped systems, with SWCNT doping a clear increase was seen in V th . 19 Using two commercially available liquid crystals, including the eutectic mixture E7 used here and DC bias for reorientation, Schymura and Scalia 20 reported a slight increase in V th and a small reduction in dC/dV when CNTs (SWCNTs or MWCNTs) were added to the LC. To summarize these observations, with the addition of CNT, (i) generally V th is not lowered, (ii) the ratio dC/dV diminishes, and (iii) there is no improvement in response time.…”

Section: Introductionmentioning

confidence: 90%

Carbon Nanotube Reinforced Polymer-Stabilized Liquid Crystal Device: Lowered and Thermally Invariant Threshold with Accelerated Dynamics

Prasad

Baral

Murali

et al. 2017

ACS Appl. Mater. Interfaces

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Polymer-stabilized liquid crystal (PSLC) devices comprise a polymer matrix in an otherwise continuous phase of liquid crystal. The fibrils of the polymer provide, even in the bulk, virtual surfaces with finite anchoring energy resulting in attractive electro-optic properties. Here, we describe a novel variation of the PSLC device fabricated by reinforcing the polymer matrix with polymer-capped single-walled carbon nanotubes (CNTs). The most important outcome of this strengthening of the polymer strands is that the threshold voltage associated with the electro-optic switching becomes essentially temperature independent in marked contrast to the significant thermal variation seen in the absence of the nanotubes. The reinforcement reduces the magnitude of the threshold voltage, and notably accelerates the switching dynamics and the effective splay elasticity. Each of these attributes is quite attractive from the device operation point of view, especially the circuit design of the required drivers. The amelioration is caused by the polymer decorating CNTs being structurally identical to that of the matrix. The resulting good compatibility between CNTs and the matrix prevents the CNTs from drifting away from the matrix polymer, a lacuna in previous attempts to have CNTs in PSLC systems. The difference in the morphology, perhaps the primary cause for the effects seen, is noted in the electron microscopy images of the films.

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“…Так, для использования таких композитов в устройствах микроэлектроники и фотоники, необходимо снизить величины порогового напряжения переориентации молекул ЖК и времени отклика. В литературе описано положительное влияние допирования ЖК частицами в виде одностенных или многостенных углеродных нанотрубок (МУНТ) для решения этой проблемы [1,2]. Дисперсные углеродные частицы, распределенные в объеме ЖК, создавая множественные границы раздела углерод-ЖК, могут влиять на изменение физико-химических свойств ЖК.…”

Section: Introductionunclassified

Regularities of Formation of Polymer-Dispersed Liquid Crystal Materials Doped with Carbon Nanotubes

Podyacheva¹,

Матус²,

Suboch³

et al. 2018

Liq. Cryst. and their Appl.

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Разработаны новые композиты на основе полимерно-дисперсных жидкокристаллических материалов и углеродных нанотрубок. Исследовано влияние предварительной механической активации многостенных углеродных нанотрубок и азот-содержащих углеродных нанотрубок (N-УНТ), использования ультразвука и седиментации на стабильность суспензий «углерод-органический растворитель». Определены оптимальные условия для получения рабочих суспензий, стабильных в течение 10 суток. Показана возможность использования рабочих суспензий для формирования новых композитов жидкий кристалл-полимер-N-УНТ, стабильно работающих в течение 15 циклов подачи и отключения электрического поля. Ключевые слова: многостенные углеродные нанотрубки, азот, дефектность, полимерно-дисперсные жидкие кристаллы.

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Carbon Nanotube Effects on Electro-Optic Characteristics of Twisted Nematic Liquid Crystal Cells

Cited by 11 publications

References 16 publications

Alignment and Reorientation in Nematic Liquid Crystals Doped with Red Dye and Carbon Nanotube

Alignment and Reorientation in Nematic Liquid Crystals Doped with Red Dye and Carbon Nanotube

Carbon Nanotube Reinforced Polymer-Stabilized Liquid Crystal Device: Lowered and Thermally Invariant Threshold with Accelerated Dynamics

Regularities of Formation of Polymer-Dispersed Liquid Crystal Materials Doped with Carbon Nanotubes

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