Command Electro-Optical Switching of Photoaligned Liquid Crystal on Photopatterned Graphene

Varanytsia, Andrii; Chien, Liang–Chy

doi:10.1038/s41598-017-11903-9

Cited by 6 publications

(3 citation statements)

References 39 publications

(39 reference statements)

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“…Photoalignment and field-induced photo-reactive alignment have been used for creating pre-tilt for specific applications such as in vertical alignment displays [23,24], to improve anchoring strength [25] and response time [26]. Very recently, command surfaces made with graphene were fabricated for high-transmission in-plane-switching (IPS) liquid crystal devices [27].…”

Section: Effect Of Dynamically Changing the Substrate's Easy Axis On ...mentioning

confidence: 99%

Effect of dynamically changing the substrate’s easy axis on the response time of nematic samples

Souza

Granado

Evangelista

et al. 2018

J. Phys.: Condens. Matter

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Recent discoveries of advanced photocontrolled materials have kindled a great deal of interest on their use as command surfaces that switch easy axis under light radiation. One noticeable point when using switchable surfaces on any application is how the dynamical process propagates to the bulk directors. In this paper, we theoretically study the effect of a relaxing easy axis over time on a nematic sample when finite anchoring energy and surface viscosity are included. We first consider the case where just one of the substrates decay over time in an initially distorted director organization. Next, we assume that both substrates can be switched simultaneously. From the calculated director we obtained the optical profile and finally the molecular response time of the material. The response time depends on both the materials and the surfaces properties including its decay time. Our results might be used for understanding and engineering liquid crystal displays and other electro-optical devices with photocontrolled alignment layers.

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Section: Effect Of Dynamically Changing the Substrate's Easy Axis On ...mentioning

confidence: 99%

Effect of dynamically changing the substrate’s easy axis on the response time of nematic samples

Souza

Granado

Evangelista

et al. 2018

J. Phys.: Condens. Matter

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“…Guest-host liquid crystal (LC) devices [1][2][3][4], developed in late 1960s, have found renewed interest as dimmer for see-through displays [5], diffractive photonic devices [6], portable information system [7], and smart windows for energy-saving buildings [8]. Its unique features are electrically controllable transmittance, no need for polarizer, wide viewing angle, low manufacturing cost, and possible usage of flexible plastic substrates [9,10]. A guest-host LC usually contains 2-3% absorptive dichroic dyes in a nematic host.…”

Section: Introductionmentioning

confidence: 99%

Photo-responsive dye-doped liquid crystals for smart windows

Talukder

Lee

2019

Opt. Express

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An electric field drives most dye-doped liquid crystal devices. Here, we demonstrate a new photo-responsive dye-doped self-organized cholesteric liquid crystal device. Upon UV or blue light exposure, the helical twisting power of the chiral azobenzene changes because of the trans-cis isomerization. As a result, the initially vertically aligned liquid crystal directors and dye molecules will change from transparent state to dark state. Such a polarizer-free photo-activated dimmer can be used for wide range of applications, such as diffractive photonic devices, portable information system, vehicular head-up displays, and as a smart window for energy-saving buildings.

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“…Generally, graphene-based liquid crystal devices are being used in various optoelectronic devices due to its high electron transfer rate and chemical stability. The fabrication process involves the development of graphene onto the metal matrix through micromechanical cleavage, 45 chemical vapor deposition, 46 chemical synthesis, 47 etc. followed by a transfer of graphene onto a transparent substrate.…”

Section: ■ Introductionmentioning

confidence: 99%

Green Approach To Produce a Graphene Thin Film on a Conductive LCD Matrix for the Oxidative Transformation of Ciprofloxacin

Divyapriya

Thangadurai

Nambi

2018

ACS Sustainable Chem. Eng.

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This study demonstrates the use of disposed liquid crystal display (LCD) glass as a supporting matrix for the fabrication of a binder/linker free thin film graphene electrode. Graphene oxide (GO) was drop casted onto the LCD matrix and electrochemically reduced to form an ErGO–LCD electrode which was subsequently employed for the electro-Fenton oxidation of ciprofloxacin. Fourier transform infrared spectroscopy confirms the presence of (i) functional groups such as CO, N–H, CN, and C–N on the LCD matrix, (ii) attachment of GO onto the LCD, and (iii) reduction of oxygen functionalities at the surface of the ErGO–LCD electrode. Raman and X-ray photoelectron spectroscopy were performed to examine the nature and chemical composition of the GO–LCD and ErGO–LCD electrodes. Cyclic voltammetry and electrochemical impedance spectroscopic studies revealed the enhancement of the oxidation–reduction properties and reduction of charge transfer resistance (Rct 17 Ω) in the presence of [Fe(CN)6]3–/4– redox species. Electro-Fenton results revealed that a high concentration of H2O2 (45 mg L–1) was produced at acidic pH as compared to neutral (20 mg L–1) or alkaline (15 mg L–1) conditions. Furthermore, a higher current efficiency for the production of H2O2 was found at −1.0 V (63%) as compared to −1.5 V (59%) and −2.0 V (51%). Degradation studies showed >99% removal of ciprofloxacin was observed at pH 3.5 as compared to pH 7.0 (92%) or pH 9.0 (77%) at −1.5 V. The reuse experiments suggested that the electrode is stable and reusable for more than 7 cycles of experiments. The average pseudo-first-order kinetic rate constant for seven cycles of reuse was found to be 0.017 min–1.

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Command Electro-Optical Switching of Photoaligned Liquid Crystal on Photopatterned Graphene

Cited by 6 publications

References 39 publications

Effect of dynamically changing the substrate’s easy axis on the response time of nematic samples

Effect of dynamically changing the substrate’s easy axis on the response time of nematic samples

Photo-responsive dye-doped liquid crystals for smart windows

Green Approach To Produce a Graphene Thin Film on a Conductive LCD Matrix for the Oxidative Transformation of Ciprofloxacin

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