Developing novel liquid crystal technologies for display and photonic applications

Atkuri, Hari M.; Leong, Eng Choon; Hwang, Jeoung‐Yeon; Palermo, Giovanna; Si, Guangyuan; Wong, Jenny-Marie; Chien, Liang–Chy; Ma, Jin; Zhou, Kui; Liu, Yan Jun; Sio, Luciano De

doi:10.1016/j.displa.2014.10.006

Cited by 9 publications

(6 citation statements)

References 62 publications

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“…Rubbing of polyimide consists of multi-step processes such as coating and soft and hard baking along with the drawbacks like dust creation, surface damage, or electrostatic charge generation, greatly limiting its application for high-quality displays. Several alternative noncontact alignment techniques have been proposed, such as those of photoalignment, − self-assembled monolayers (SAMs), , oxide evaporation, nanopatterns, − etc. to get rid of the shortcomings involved in the rubbing technique.…”

Section: Introductionmentioning

confidence: 99%

Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment

Kumar

Jiang

et al. 2020

ACS Appl. Electron. Mater.

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Homeotropic alignment of liquid crystals (LCs) is one of the key modes used in commercial liquid crystal displays (LCDs) due to its advantages, such as high contrast ratios and fast response speed. Here, we report stable homeotropic LC alignment with a small pretilt angle in a nematic, negative LC host doped with additives including self-aligning agents, photoresponsive azo dyes and reactive mesogen via an in-situ self-assembled, dual-wavelength photoalignment approach. The underlying mechanism of stable, pretilted homeotropic LC alignment was further analyzed in detail. The achieved pretitled homeotropic LC cells are very stable against heat and UV light exposure and demonstrate excellent electro-optical characteristics. The experimental results show that such a noncontact, simple homeotropic alignment technique has big potential in many applications, such as high-quality LCDs, spatial light modulators, and other optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment

Kumar

Jiang

et al. 2020

ACS Appl. Electron. Mater.

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“…53,54 The zeta potential of the shell particles was measured by Laser Doppler Electrophoresis (ZETASIZER NANO ZS, Malvern Panalytical) at 25 C in 5.0 mM NaCl solution. 1 H NMR measurements were conducted to determine the copolymerized amounts of each monomer.…”

Section: Characterization Of the Polymeric Shell Particlesmentioning

confidence: 99%

“…Liquid crystal displays (LCDs) were released in the 2000s, and they have rapidly replaced cathode‐ray tubes. LCDs have now become so widespread throughout the world that our lives today would not be possible without them, including their use in smartphones, laptops, and digital camera monitors 1–3 . LCD technology has made great progress over the past several years, creating new products one after another 4–8 .…”

Section: Introductionmentioning

confidence: 99%

“…LCDs have now become so widespread throughout the world that our lives today would not be possible without them, including their use in smartphones, laptops, and digital camera monitors. [1][2][3] LCD technology has made great progress over the past several years, creating new products one after another. [4][5][6][7][8] Advancements in mounting technology for forming large-scale integration circuit boards have been essential to the evolution of these displays.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical stability and insulation reliability of polymeric layers constructed by thermal fusion of polymer shell particles heterocoagulated on conductivenickel‐platedcore particles

Naruhashi

Aoki

Taniguchi

et al. 2023

J of Applied Polymer Sci

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In this study, the mechanical stability and insulating reliability of polymeric layers constructed on the surface of nickel‐plated particles for anisotropic conductive films were measured by means of a microcompression test. The polymeric layers were constructed by heterocoagulation between the nickel‐plated core particles and the polymeric shell particles and successive thermal fusion. Uniform core‐shell particles with a coverage of approximately 60%–70% were prepared at NaCl concentrations near the critical coagulation concentrations of the shell particles. Continuous polymeric layers were successfully formed by heating the heterocoagulates at a temperature slightly higher than the glass transition temperature of the shell particles. The microcompression test was applied to measure the compression displacement until the heterocoagulates were electrically connected. The larger the shell particles and the higher the coverage of heterocoagualtes, the greater the displacement, reaching a maximum displacement of 0.72 μm for heterocoagulates with shell particles of 217 nm before heating. Heating the heterocoagulates and thermally melting adjacent shell particles could further improve the insulating properties of polymeric layer. Thermal melting of shell particles of heterocoagulates with a coverage more than 60% by 152 or 217 nm shells resulted in the disappearance of zero‐point conductive particles.

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“…Engineered nanomaterials (ENMs) are typically defined as materials smaller than 100 nm in at least one dimension, and they have specific surface functionalizations and size-dependent properties, such as high reactivity and large surface-to-volume ratio, that satisfy their wide range of applications, including in sensing [1][2][3][4][5], optics [6][7][8][9][10], energy [11][12][13][14][15], catalysis [16][17][18][19], biotechnology [20][21][22][23][24] and so on.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles for Water Pollution Monitoring and Treatments: Ecosafety Challenge and Cellulose-Based Hybrids Solution

et al. 2020

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Silver nanoparticles (AgNPs) are widely used as engineered nanomaterials (ENMs) in many advanced nanotechnologies, due to their versatile, easy and cheap preparations combined with peculiar chemical-physical properties. Their increased production and integration in environmental applications including water treatment raise concerns for their impact on humans and the environment. An eco-design strategy that makes it possible to combine the best material performances with no risk for the natural ecosystems and living beings has been recently proposed. This review envisages potential hybrid solutions of AgNPs for water pollution monitoring and remediation to satisfy their successful, environmentally safe (ecosafe) application. Being extremely efficient in pollutants sensing and degradation, their ecosafe application can be achieved in combination with polymeric-based materials, especially with cellulose, by following an eco-design approach. In fact, (AgNPs)–cellulose hybrids have the double advantage of being easily produced using recycled material, with low costs and possible reuse, and of being ecosafe, if properly designed. An updated view of the use and prospects of these advanced hybrids AgNP-based materials is provided, which will surely speed their environmental application with consequent significant economic and environmental impact.

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Developing novel liquid crystal technologies for display and photonic applications

Cited by 9 publications

References 62 publications

Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment

Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment

Mechanical stability and insulation reliability of polymeric layers constructed by thermal fusion of polymer shell particles heterocoagulated on conductivenickel‐platedcore particles

Silver Nanoparticles for Water Pollution Monitoring and Treatments: Ecosafety Challenge and Cellulose-Based Hybrids Solution

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