Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal Alignment

Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal Alignment

We have developed a very useful and cost-effective liquid crystal (LC) alignment layer of brush-coated TiO<sub>2</sub> that is solution-processable for twisted nematic (TN) LC cells. TiO<sub>2</sub> was prepared via the sol-gel method. The TiO<sub>2</sub> solution...

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Main Authors: Jong In Jang, Hae-Chang Jeong
Format: Article
Language:English
Published: MDPI AG 2020-09-01
Series:Crystals
Subjects:
shear induced nanostructure
brush coating
TiO<sub>2</sub>
liquid crystal alignment
Online Access:https://www.mdpi.com/2073-4352/10/10/860
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spelling doaj-4a18202f4b044fa5919c64f8d865b3122020-11-25T03:12:23ZengMDPI AGCrystals2073-43522020-09-011086086010.3390/cryst10100860Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal AlignmentJong In Jang0Hae-Chang Jeong1Department of Electrical Engineering, Changwon National University, Gyeongnam 51140, KoreaDepartment of Electrical Engineering, Changwon National University, Gyeongnam 51140, KoreaWe have developed a very useful and cost-effective liquid crystal (LC) alignment layer of brush-coated TiO<sub>2</sub> that is solution-processable for twisted nematic (TN) LC cells. TiO<sub>2</sub> was prepared via the sol-gel method. The TiO<sub>2</sub> solution was brush-coated on the substrate, followed by an annealing process. During the brush-coating process, a retracting force is generated on the deposited TiO solutions along the coating direction. The annealing process hardens the TiO<sub>2</sub> and generates shearing stress arising from the retracting force along the brush-coating direction. The shearing stress created highly oriented nano/microstructure and uniformly aligned LCs with a stable pretilt angle of 0.6°. TN mode LC cells based on brush-coated TiO<sub>2</sub> exhibited a performance of 12.5 ms of response and a threshold voltage of 1.8 V. Our brush-coated TiO<sub>2</sub> incorporates two steps of the film deposition and alignment process into one step.https://www.mdpi.com/2073-4352/10/10/860shear induced nanostructurebrush coatingTiO<sub>2</sub>liquid crystal alignment
collection DOAJ
language English
format Article
sources DOAJ
author Jong In Jang
Hae-Chang Jeong
spellingShingle Jong In Jang
Hae-Chang Jeong
Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal Alignment
Crystals
shear induced nanostructure
brush coating
TiO<sub>2</sub>
liquid crystal alignment
author_facet Jong In Jang
Hae-Chang Jeong
author_sort Jong In Jang
title Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal Alignment
title_short Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal Alignment
title_full Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal Alignment
title_fullStr Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal Alignment
title_full_unstemmed Shear Induced TiO<sub>2</sub> Nano Structure Using Brush-Coating for Liquid Crystal Alignment
title_sort shear induced tio<sub>2</sub> nano structure using brush-coating for liquid crystal alignment
publisher MDPI AG
series Crystals
issn 2073-4352
publishDate 2020-09-01
description We have developed a very useful and cost-effective liquid crystal (LC) alignment layer of brush-coated TiO<sub>2</sub> that is solution-processable for twisted nematic (TN) LC cells. TiO<sub>2</sub> was prepared via the sol-gel method. The TiO<sub>2</sub> solution was brush-coated on the substrate, followed by an annealing process. During the brush-coating process, a retracting force is generated on the deposited TiO solutions along the coating direction. The annealing process hardens the TiO<sub>2</sub> and generates shearing stress arising from the retracting force along the brush-coating direction. The shearing stress created highly oriented nano/microstructure and uniformly aligned LCs with a stable pretilt angle of 0.6°. TN mode LC cells based on brush-coated TiO<sub>2</sub> exhibited a performance of 12.5 ms of response and a threshold voltage of 1.8 V. Our brush-coated TiO<sub>2</sub> incorporates two steps of the film deposition and alignment process into one step.
topic shear induced nanostructure
brush coating
TiO<sub>2</sub>
liquid crystal alignment
url https://www.mdpi.com/2073-4352/10/10/860
work_keys_str_mv AT jonginjang shearinducedtiosub2subnanostructureusingbrushcoatingforliquidcrystalalignment
AT haechangjeong shearinducedtiosub2subnanostructureusingbrushcoatingforliquidcrystalalignment
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