Article
Polymer Science
Chia-Yi Huang, Shih-Hung Lin
Summary: By patterning PDLC films with a combination of tri-functional monomers and LCs, an organic solvent sensor was created to distinguish between acetone and ethanol based on different responses in light scattering intensity and response time.
Article
Engineering, Manufacturing
Huimin Zhang, Zongcheng Miao, Wenbo Shen
Summary: This review provides an overview of recent advancements in the research of polymer-dispersed liquid crystals (PDLCs), including performance optimization, novel operation modes, and application developments. The working principle and fabrication procedure of PDLCs are briefly explored, with a systematic summary of recent research in preparation, experimental investigation, and applications. Challenges and future improvements are also discussed.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Computer Science, Hardware & Architecture
Ting-Gang Liang, Chun-Wei Su, Mei-Yung Chen
Summary: This work focuses on image enhancement technology for Polymer-Dispersed Liquid Crystals (PDLC) in a transparent display. By using dark channel prior combined with guided filtering, it aims to sharpen the image and improve parameter quality. An algorithm is introduced to independently handle the low grayscale parts and maintain the resolution for higher grayscale parts, making the result more similar to the original image.
Article
Chemistry, Multidisciplinary
Anuja Katariya-Jain, R. R. Deshmukh
Summary: This study prepared polymer dispersed liquid crystal (PDLC) films doped with dichroic azo dye using the polymer-induced phase separation method. Various characterization techniques were employed to determine the properties of the components and the operating principles of the dye-doped PDLC films. The electro-optical analysis indicated excellent performance of the DPDLC film with a low dye concentration, showing high contrast ratio, transmittance difference, low threshold and saturation voltages, and minimum hysteresis effect.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Chemistry, Multidisciplinary
Wencui Zhang, Donghao Fan, Yanli Gong, Wenlang Liang
Summary: In this study, a polymer-dispersed liquid crystal (PDLC) thin film was prepared on glass substrates using solvent- and polymerisation induced phase separation, combined with soft lithography. The PDLC thin film was demonstrated to be a facile and portable sensor platform for detecting toluene with a low detection limit of 2.66 ppm by observing the director configuration change of the LC droplets in the polymer thin film. The sensor platform exhibited rapid response time and reusability for toluene detection.
Article
Chemistry, Analytical
Srinivas Pagidi, Kedhareswara Sairam Pasupuleti, Maddaka Reddeppa, Soyeon Ahn, Youngseo Kim, Jong-Hyun Kim, Moon-Deock Kim, Seung Hee Lee, Min Yong Jeon
Summary: In this work, functionalized carbon nanotubes (f-CNTs) were integrated into polymer-dispersed liquid crystals (PDLCs) to create a gas sensor device. The proposed device exhibited a higher response rate and linear relationship for NO2 gas detection compared to traditional PDLCs, and demonstrated excellent reproducibility and selectivity.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Materials Science, Multidisciplinary
Xiangshen Meng, Jian Li, Yueqiang Lin, Xiaodong Liu, Jianwei Zhao, Decai Li, Zhenghong He
Summary: This study investigates a method to improve the capacitance and electro-optical response of dilute magnetic PDLC. By using magnetic separation treatment, the ion concentration of the liquid crystal colloid is further decreased. The performance of the diluted magnetic PDLC is improved by doping high concentration of magnetic nanoparticles and magnetic separation treatment.
Article
Materials Science, Multidisciplinary
Park So Yeon, Farzana Ahmad, Young Jae Jeon, Muhammad Jamil
Summary: This study investigates the effects of different chain lengths of polymer precursors on the electro-optical properties of polymer-dispersed liquid crystal (PDLC) films. PDLC films were prepared by inserting polymer precursors of varying chain lengths into liquid crystal (LC) and polymer mixtures. The electro-optical properties of the PDLC films were characterized by measuring haze, transmittance, and contrast ratio (CR). The results show that longer chain lengths of the precursor monomer result in larger liquid crystal droplet sizes. Additionally, higher ON transmittance and lower threshold voltage were observed in more viscous polymer matrices.
JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
(2023)
Article
Biochemical Research Methods
Ruoyu Jiang, Paul Yoo, Abhinand M. Sudarshana, Emma Pelegri-O'Day, Sandeep Chhabra, Marissa Mock, Abraham P. Lee
Summary: In this study, we demonstrate a microfluidic viscometer by acoustic streaming transducers (mu VAST) that utilizes acoustic microstreaming to measure fluid viscosity. The platform is validated with glycerol content mixtures to estimate viscosity based on the maximum speed of the second-order acoustic microstreaming. mu VAST requires only a small volume of fluid sample (approximately 1.2 μL) and can be scaled up for high throughput viscosity measurements. The ability to measure 16 samples within 3 seconds makes mu VAST attractive for automating process flows in drug development and materials manufacturing.
Article
Chemistry, Physical
Palash Dhara, Rabibrata Mukherjee
Summary: This paper reports on the morphology, phase separation, instability, and dewetting of Polymer dispersed liquid crystal (PDLC) thin film comprising nematic liquid crystal, 4-n-pentyl-4'-cyanobiphenyl (5CB), and Polystyrene (PS). It is found that the thickness and composition of the film play a crucial role in their properties, and topographically patterned substrates can help align the phase-separated LC domains.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
C. C. Wang, B. L. Zhu, C. H. Yi, H. X. Chen, H. Peng, J. H. Yin, J. Wu, H. Z. Gu
Summary: Polymer dispersed liquid crystal (PDLC) films have been studied using aromatic polyurethane acrylate (PUA) as the polymer matrix. The effect of diluents [lauryl methacrylate (LMA) and isobornyl acrylate (IBOA)] content on the electrical-optical properties of PDLC films was investigated, and the influence of Ag nanowires (NWs) content was also analyzed. The results showed that the properties of the films were optimized at specific weight ratios of PUA/LMA or PUA/LMA/IBOA, and better overall properties were achieved with certain concentrations of Ag NWs.
Article
Engineering, Electrical & Electronic
Xiangshen Meng, Jian Li, Yueqiang Lin, Xiaodong Liu, Decai Li, Zhenghong He
Summary: A corrected measurement method for the silicon photodiode detector (SPD) was investigated. The measured transmittance error between the SPD and the light power meter (LPM) depends on the incident light power. A nonlinear empirical formula was derived and used to correct the measuring results of the polymer-dispersed liquid crystal. The corrected results were identical to those of the LPM, and it was found that the SPD is faster than LPM in measuring electro-optical response.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Multidisciplinary
Xiangshen Meng, Jian Li, Yueqiang Lin, Xiaodong Liu, Jianwei Zhao, Guoqing Li, Decai Li, Zhenghong He
Summary: This paper investigated the electro-optical properties of dilute magnetic polymer dispersed liquid crystals (PDLCs) prepared with liquid crystal colloids containing low concentrations of gamma-Fe2O3 nanoparticles. The doped nanoparticles had little effect on the morphology of PDLCs, but significantly changed the threshold voltage, saturation voltage, and contrast ratio. These changes were attributed to the competition between ionic adsorption and nanoparticle concentration. Below the critical concentration, the adsorption of free ions dominated, leading to an increase in contrast ratio and a decrease in saturation voltage. Conversely, above the critical concentration, the intrinsic electro-optical effect of the nanoparticles dominated, resulting in a decrease in contrast ratio and an increase in saturation voltage.
Article
Materials Science, Composites
Min Sun, Qing Sun, Jian Zhang, Jiawei Sheng
Summary: In this study, high-density polyethylene (HDPE)/phosphogypsum (PG) and polypropylene (PP)/PG composites were produced using mass-produced PG powders and a twin screw extruder. XRD analysis showed that the morphology of the PG phase was influenced by different calcination temperatures. Mechanical property tests showed that within the studied weight fraction range, the Young's modulus and tensile strength of the PG/HDPE composites increased significantly, while impact strength and elongation at break decreased remarkably. The Young's modulus and impact strength of PG/PP composites increased prominently, but tensile strength and elongation at break were significantly reduced. Thermodynamic analysis suggested that PG can improve the thermal stability of the composite materials.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Chemistry, Physical
Farzana Ahmad, A-Ri Jeon, Young Jae Jeon, Muhammad Jamil
Summary: A new manufacturing method for PDLC films was proposed in this study, involving coating N-Ps acrylate layer on ITO glass first, before placing it onto the polymer/LC crystal mixture to improve the uniform distribution of N-Ps particles. The PDLC films prepared by this new technique showed improved electro-optical characteristics with good optical properties and uniform droplet morphology distribution.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2022)
