Article
Chemistry, Multidisciplinary
Jin Young Oh, Eun-Mi Kim, Gi-Seok Heo, Dong Hyun Kim, DongWook Lee, Hae-Chang Jeong, Dae-Shik Seo
Summary: The present study demonstrates that ultraviolet-nanoimprint lithography (UV-NIL) can be used to transfer a one-dimensional nano-pattern onto a high-k aluminum oxide thin film mixed with a UV photocuring agent. The imprinted nano-patterns induce geometric deformations in liquid crystal, creating collective and elastic properties that guide homogeneous alignment. The nanoimprint method allows for easier, faster, and more accurate processing of a large area compared to conventional rubbing methods. Additionally, the optical properties of the nano-imprinted aluminum oxide thin film are superior to conventional commercialized cells, significantly affecting the luminance and color gamut of displays.
Article
Chemistry, Physical
Federico Caimi, Giovanni Nava, Raouf Barboza, Noel A. Clark, Eva Korblova, David M. Walba, Tommaso Bellini, Liana Lucchetti
Summary: The article investigates the surface alignment of the ferroelectric nematic phase and finds specific behaviors and factors that affect the alignment, such as orientation, defects, and electric field response.
Article
Chemistry, Multidisciplinary
Le Gia Trung, Subhangi Subedi, Avinash Kumar Rella, Vineet Kumar, Shin-Woong Kang
Summary: Graphene-oxide (GO) has been widely studied as a functional two-dimensional material. Highly ordered supramolecular anisotropic GO films can be fabricated by a hydraulic shear, resulting in uniform in-plane birefringence. The folding-induced in-plane birefringence of GO-LCs provides insights for processing anisotropic 2D materials beneficial for various electrical, optical, and mechanical applications.
Article
Engineering, Chemical
Yi-Hua Hung, Kai -Ti Chang, Zi-Yun Chiu, Jia-Ying Chang, Kai -Ting Yen, Chun -Yen Liu
Summary: In this study, a novel liquid crystalline acrylic chiral dopant was synthesized and incorporated into dual frequency cholesteric liquid crystal, resulting in a bistable display material with a high transmittance of 97.6% and a fast response time of 1.5 ms. The material can maintain the transparent ON and opaque OFF states without the bias of a continuous electric field.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Crystallography
Junyu Zou, Zhiyong Yang, Chongchang Mao, Shin-Tson Wu
Summary: Two high birefringence and low viscosity nematic mixtures have been reported for phase-only liquid-crystal-on-silicon spatial light modulators, with a fast response time and improved photostability. A distributed Bragg reflector is designed to cut off harmful UV and blue wavelengths, making these materials promising candidates for future 6G optical communications.
Article
Materials Science, Coatings & Films
Dong Hyun Kim, Dong Wook Lee, Jin Young Oh, Jonghoon Won, Dai-Hyun Kim, Hae-Chang Jeong, Dae-Shik Seo
Summary: This study compressed the conventional two-step process of brush coating and orientation for liquid crystal (LC) alignment layer manufacturing into a one-step process, demonstrating excellent LC orientation properties of the brush-coated film.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Engineering, Environmental
Changtong Zhou, Yong Qi, Shufen Zhang, Wenbin Niu, Suli Wu, Wei Ma, Bingtao Tang
Summary: The construction of novel photonic structures enables the creation of stimuli-responsive functional materials. The innovative water-response double-inverse opal (WRDIO) films, fabricated by introducing polystyrene microspheres into the inverse-opal backbone, exhibit fast response time and brilliant structural color. The deprotonation of carboxyl groups in the inverse-opal backbone enhances hydrophilicity, facilitating water penetration, while high-proportioned carboxylic anions cause rapid swelling of WRDIO film in water. The broad-spectrum shifting of WRDIO film depends on the composition of the ethanol-water mixture, showing potential applications in anti-counterfeiting and sensors.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Seung-Rak Son, Jongil An, Jin-Wook Choi, Soyern Kim, Jisung Park, Jun Hyup Lee
Summary: This study presents a novel method utilizing alkylated graphene oxide for achieving homeotropic alignment of nematic liquid crystals, resulting in initial homeotropic orientation with excellent alignment ability and optical performance.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Kunpeng Ruan, Xuetao Shi, Yali Zhang, Yongqiang Guo, Xiao Zhong, Junwei Gu
Summary: The positive liquid crystals, 4'-heptyl-4-biphenylcarbonitrile (7CB), are used to functionalize carbon nanotubes (LC-CNT) and fabricate thermally conductive LC-CNT/LC-PI composite films through the oriented alignment of LC-CNT within the LC-PI matrix. The resulting composite films exhibit significantly improved thermal conductivity and mechanical properties compared to the intrinsically thermally conductive LC-PI films and CNT/LC-PI composite films.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Crystallography
Junyu Zou, Qian Yang, En-Lin Hsiang, Haruki Ooishi, Zhuo Yang, Kifumi Yoshidaya, Shin-Tson Wu
Summary: The new nematic mixture features high birefringence, moderate dielectric anisotropy, low viscosity, and good photostability, making it suitable for various applications with fast response time.
Review
Materials Science, Multidisciplinary
P. Priscilla, Praveen Malik, Supreet, Ajay Kumar, Riccardo Castagna, Gautam Singh
Summary: This review focuses on the alignment of liquid crystals (LCs) controlled by nanoparticles. It is found that doping nanoparticles in LCs or patterning nanostructures on substrates can achieve the desired alignment of LCs. Using nanoparticles for LC alignment has similar quality to conventional alignment techniques, but it is less time consuming and cost-effective. Furthermore, nanoparticles can greatly improve the electro-optical properties of LC devices.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2023)
Article
Multidisciplinary Sciences
Xiaofang Zhang, Saewon Kang, Katarina Adstedt, Minkyu Kim, Rui Xiong, Juan Yu, Xinran Chen, Xulin Zhao, Chunhong Ye, Vladimir V. Tsukruk
Summary: Naturally derived biopolymers have attracted great interest for constructing photonic materials with multi-scale ordering and other attractive properties. However, traditional processing often leads to non-uniform organization. In this study, researchers report a uniform biophotonic organization of cellulose nanocrystals decorated with superparamagnetic nanoparticles, resulting in a transformation from one phase to another with near-perfect orientation order parameter. The resulting films are flexible, robust, and possess anisotropic birefringence and light scattering, making them highly suitable for actuation in response to various stimuli.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Chen Shen, Masaki Matsubara, Tomomi Masui, Hiroyuki Kishimoto, Shinya Yamanaka, Atsushi Muramatsu, Kiyoshi Kanie
Summary: A facile method was developed to prepare high-performance magnetorheological elastomer (MRE) films by aligning magnetite nanoplates in synthetic rubbers under an external magnetic field. The introduction of polystyrene chains onto the surface of the nanoplates ensured the dispersion stability and interfacial compatibility. The spiral structures formed by PS-modified nanoplates exhibited a magnetic field-responsive behavior and enhanced the rheological performance of MRE films.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Multidisciplinary Sciences
Yuan Shen, Ingo Dierking
Summary: Understanding collective motion in biological systems is crucial for the development of autonomous robots and swarm computing. This study introduces an experimental platform that mimics the collective motion of living systems using liquid crystal driven by an external electric field. The platform generates hundreds of artificial particle-like solitonic field configurations, called directrons, which exhibit dynamic behaviors similar to those seen in biological systems.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Fluids & Plasmas
Izabela Sliwa, Pavel V. Maslennikov, Alex V. Zakharov
Summary: This article describes the physical mechanism behind the appearance of traveling and nontraveling distortions in a microsized homogeneously aligned nematic film under the effect of a large electric field. Numerical studies reveal that the director's field may experience a traveling distortion wave in response to the electric field, with the rate of distortion depending on the magnitude of the applied field.
Article
Chemistry, Multidisciplinary
Hae-Chang Jeong, Ju Hwan Lee, Dong Hyum Kim, Dong Wook Lee, Jeong Min Han, Byeong-Yun Oh, Tae Wan Kim, Dae-Shik Seo
Article
Polymer Science
Ju Hwan Lee, Hae-Chang Jeong, Jonghoon Won, Byeong-Yun Oh, Dong Hyun Kim, Dong Wook Lee, Yang Liu, Dae-Shik Seo
Article
Materials Science, Multidisciplinary
Ju Hwan Lee, Jonghoon Won, Hae-Chang Jeong, Dong Hyun Kim, Dong Wook Lee, Byeong-Yun Oh, Jeong-Min Han, Tae Wan Kim, Dae-Shik Seo
Article
Materials Science, Coatings & Films
Chan-Woo Oh, Eun-Gon Park, Hong-Gyu Park
SURFACE & COATINGS TECHNOLOGY
(2019)
Article
Chemistry, Multidisciplinary
Ju Hwan Lee, Jonghoon Won, Hae-Chang Jeong, Dong Hyun Kim, Dong Wook Lee, Jeong-Min Han, Byeong-Yun Oh, Dae-Shik Seo
Article
Materials Science, Multidisciplinary
Hae-Chang Jeong, Jonghoon Won, Ju Hwan Lee, Dong Hyun Kim, Dong Wook Lee, Byeong-Yun Oh, Jeong-Min Han, Dae-Shik Seo
Article
Engineering, Electrical & Electronic
Ju Hwan Lee, Jonghoon Won, Hae-Chang Jeong, Dong Hyun Kim, Dong Wook Lee, In Ho Song, Byeong-Yun Oh, Jeong-Min Han, Dai-Hyun Kim, Dae-Shik Seo
JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY
(2019)
Article
Chemistry, Multidisciplinary
Jong Hoon Won, Ju Hwan Lee, Dong Hyum Kim, Dong Wook Lee, Dae-Hyun Kim, Hae-Chang Jeong, Byeong-Yun Oh, Jeong Min Han, Dae-Shik Seo
Article
Physics, Multidisciplinary
Byeong-Yun Oh, Yong Seob Park
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2019)
Article
Chemistry, Physical
Myungwoo Son, Sang-Soo Chee, So-Young Kim, Wonki Lee, Yong Hyun Kim, Byoung-Yun Oh, Jun Yeon Hwang, Byoung Hun Lee, Moon-Ho Ham
Article
Chemistry, Multidisciplinary
Jonghoon Won, Hae-Chang Jeong, Ju Hwan Lee, Dong Hyun Kim, Dong Wook Lee, Byeong-Yun Oh, Yang Liu, Dae-Shik Seo
Article
Materials Science, Multidisciplinary
Se-Hoon Choi, Jin-Ah Kim, Sang-Yeon Lee, Kuck-Jin Hwang, Se-Yeong Park, Eun-Song Ji, Hong-Gyu Park
Summary: Combining rubbing process with an atmospheric plasma process improves liquid crystal alignment and electro-optical characteristics, resulting in lower driving voltage and more effective switching voltage. The thermal stability and alignment characteristics of LC displays treated using this combined method are superior to those treated with atmospheric plasma-only process. This study suggests a more efficient route to manufacturing high-performance LC displays.
Article
Materials Science, Ceramics
Jin-Ah Kim, Se-Hoon Choi, Hong-Gyu Park
Summary: We investigate the effect of varying solution-derived zinc oxide (ZnO) concentrations on liquid crystal (LC) alignment after treatment with atmospheric plasma. Uniform alignment of the LC alignment layer is crucial for high-performance displays. The combination of atmospheric plasma and inorganic alignment layer introduces a new efficient manufacturing process with potential applications in various fields. By analyzing the surface modification, LC alignment, and electro-optical characteristics, we find that increasing the ZnO concentration enhances the pretilt angle and dipole moment between LC molecules, leading to improved driving voltage and rapid response time (<20 ms) in the samples. Optimal process conditions for manufacturing ZnO alignment films are determined using the rubbing-atmospheric pressure plasma coprocessing technique.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Myung-Gyun Baek, Sang-Seok Yun, Jin-Sa Kim, Hong-Gyu Park, Sang-Geon Park
Summary: In this study, the deposition of trimethoxy(propyl)silane as a self-assembled monolayer on the ITO substrate surface in OLEDs was investigated. The research focused on the changes in surface characteristics with variations in deposition time and temperature.
JOURNAL OF CERAMIC PROCESSING RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Hae-Chang Jeong, Jonghoon Won, Ju Hwan Lee, Dong Hyun Kim, Dong Wook Lee, Yun-Gun Lee, Byeong Yun Oh, Jeong Min Han, Dae-Shik Seo
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2019)
Article
Materials Science, Multidisciplinary
Yanbin Wang, Xinyou Huang, Ziqiu Cheng, Penghui Chen, Yuyang Chen, Junhao Ye, Haohong Chen, Zhenzhen Zhou, Denis Yu Kosyanov, Jiang Li
Summary: Uniform Al2O3-Ce:LuAG composite phosphor ceramics (CPCs) with excellent luminescent properties and thermal stability have been successfully synthesized in this study, showing great potential for application in solid-state laser lighting.
Article
Materials Science, Multidisciplinary
Syed Muhammad Ali Zaidi, Mazhar Ali Kalyar, Zulfiqar Ali Raza, Aayesha Shoukat, Rubaila Waseem, Muhammad Aslam
Summary: Polyvinyl alcohol (PVA) nanocomposite strips embedded with graphene nanosheets and copper-ferrite nanoparticles were synthesized using solution casting technique. Laser pulse irradiations were then applied to modify the structural, optical, and electrical properties of the strips, showing potential for optoelectronic devices.
Article
Materials Science, Multidisciplinary
Yunru Chen, Jialing Wu, Jiajia Wang, Shihui Ma, Hongwei Yu
Summary: This paper investigates the angular non-critical phase-matching second-harmonic-generation properties of Ba3(ZnB5O10)PO4 crystal and explores its potential applications in the output spectral regions.
Article
Materials Science, Multidisciplinary
Qun Jing, Menglin Zhu, Lu Li, Xu Ji, Haiming Duan, Henglei Chen, Ming-Hsien Lee
Summary: The paper introduces two new nonlinear optical materials, MZnPO4 (M = Rb, Cs), synthesized by cation substitution. These materials exhibit a honeycomb-like structure and show mild SHG responses with short absorption edges. The thermal properties, IR spectra, and theoretical calculations of the materials are also discussed.
Article
Materials Science, Multidisciplinary
Camila Ianhez-Pereira, Akhil Kuriakose, Ariano De Giovanni Rodrigues, Ana Luiza Costa Silva, Ottavia Jedrkiewicz, Monica Bollani, Marcio Peron Franco de Godoy
Summary: This study aims to evaluate the crystalline changes induced by ultrafast laser micromachining on manganese oxide thin films using micro-Raman spectroscopy. The results show that laser-writing is effective in locally modifying low-crystallinity films and increasing crystallite sizes, highlighting an interesting approach to evaluate laser-induced structural modifications on metal oxide thin films.
Article
Materials Science, Multidisciplinary
Kamal Bansal, Neeraj Kumar Mishra, Ibrahim Abdullahi, Param Jeet Singh, Mohit Tyagi, Sukhpal Singh
Summary: A novel Sm3+ activated oxyfluoride glass was synthesized and its structure and properties were analyzed. The glass showed potential applications in lasers, optical temperature sensing, and high-energy scintillators.
Article
Materials Science, Multidisciplinary
Xingjian Wang, Zhixu Wu, Jiawei Zhu, Yubin Kang, Mengqiang Cai, Yong Xia, Hui Deng
Summary: Antimony sulfide (Sb2S3) has been investigated as a promising material for visible light photodetectors due to its non-toxicity, stability, and high absorption coefficient. In this study, we systematically explored the impact of key parameters on the performance of Sb2S3 devices using simulation and successfully fabricated self-powered photodetectors with high responsivity and specific detectivity. Furthermore, we demonstrated the application of the Sb2S3 detector in a scanning imaging system, showcasing its potential for developing new types of visible light detectors and imaging systems.
Article
Materials Science, Multidisciplinary
O. I. Sallam, R. M. Ahmed
Summary: The 20NaF-60P2O5-20Na2O fluorophosphate glass systems doped with 3 wt% of CoO and NiO were investigated for their optical parameters before and after gamma irradiation. The presence of defects within the glass network and the addition of transition metals were found to affect the properties of the composites. After irradiation, a red shift was observed in the dissipation factor spectrum. The energy lost at the surface of the composites was larger than the energy lost within the constituent materials. All investigated composites showed insulating behavior and exhibited increased nonlinear optical parameters after irradiation, with the CoO-doped composite showing the highest values.
Article
Materials Science, Multidisciplinary
Fahimeh Ahmadi, Zeinab Ebrahimpour, Asghar Asgari, Bao Van
Summary: In this study, Er3+-doped sulfophosphate glasses containing titanium nanoparticles (TiO2 NPs) and different concentrations of silver nanoparticles (AgNPs) were synthesized. The impact of AgNPs on the physical and structural characteristics, optical absorption and emission features, and photocatalytic activity of the glasses were investigated. The results showed that the addition of AgNPs enhanced the emission intensity of the glasses, with the system containing 0.04 mol% of AgNPs exhibiting optimal performance. Furthermore, the presence of AgNPs and TiO2 NPs in the glass matrix positively affected the photocatalytic performance.
Article
Materials Science, Multidisciplinary
Zhuang Li, Rongfei Huang, Wei Yuan, Shaoqiang Zheng, Wenlu Liao, Huiying Xu, Zhiping Cai
Summary: This study reports the first realization of an 868 nm Pr:YLF laser pumped by an InGaN blue laser diode. The laser achieved a maximum power of 641 mW with stable output and good beam quality. The experimental results were in agreement with theoretical simulations.
Article
Materials Science, Multidisciplinary
Bhishma Karki, Youssef Trabelsi, Amrindra Pal, Sofyan A. Taya, Ram Bharos Yadav
Summary: This study proposes an SF11 Prism- Ag- ZnO nanowires-CeO2-Sensing layer-based surface plasmon resonance sensor for measuring dopamine concentration in human blood. The sensor demonstrates high sensitivity and detection accuracy, and holds significant importance for early diagnosis of neurological diseases.
Article
Materials Science, Multidisciplinary
M. Taoufiq, A. Soussi, A. Elfanaoui, A. Ait Hssi, S. Baoubih, A. Ihlal, K. Bouabid
Summary: In this study, the effect of copper doping within ZnS on glass substrates was investigated through experimental and theoretical approaches. Pure ZnS and Cu-doped ZnS films with varying copper concentrations were deposited on glass substrates using the SILAR technique. The structural, morphological, and optical properties of the films were characterized, and the theoretical FP-LAPW method based on density functional theory was employed to study the properties of copper-doped ZnS.