Article
Chemistry, Physical
Srinivas Pagidi, Ramesh Manda, Hoon Sub Shin, Junhyeok Lee, Young Jin Lim, MinSu Kim, Seung Hee Lee
Summary: This study presents a new approach of using a polymer composite blended with conductive PEDOT:PSS polymer to enhance the dielectric property of the system for flexible liquid crystal devices. The experimental results show that the composite polymer matrix provides a pathway of electric fields via the PEDOT:PSS, reducing the voltage drop in the composite matrix. The Kerr constant and transmittance of probe light passing through the sample increase up to 11.7% and 37.3% respectively with the addition of 3.5 wt% of PEDOT:PSS.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Polymer Science
Muhammad Shahriyar Islam, Kah-Yoong Chan, Gregory Soon How Thien, Pei-Ling Low, Chu-Liang Lee, Sew Kin Wong, Ervina Efzan Mhd Noor, Benedict Wen-Cheun Au, Zi-Neng Ng
Summary: Polymer-dispersed liquid crystal (PDLC) film is becoming popular in the market due to its unique functionalities, including switchable tint capabilities and energy-saving features. However, there is still ambiguity regarding the performance of PDLC films, such as their sizing effects on light transmission, current consumption, and power consumption. This study investigates the sizing effects and varying applied voltage effect of PDLC films, and presents a cost-efficient film with optimal parameters, paving the way for large-scale adoption in commercial and residential premises.
Article
Chemistry, Physical
Meina Yu, Tianyang Wang, Jianjun Xu, Wei Hu, Yanzi Gao, Cheng Zou, Huai Yang
Summary: This study investigates the effects of acrylate monomers with different steric end groups on the electro-optical properties and microstructure of PDLCs. The results show that by adjusting the steric group and doping concentration, the contrast ratio can be improved, the driving voltage can be reduced, and hysteresis can be decreased.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Polymer Science
Weikai Sun, Minhao Yang, Kun Peng, Yaqin Fu
Summary: The demand for high-speed communication at high frequency has led to the development of low-dielectric polymer films. Aromatic polyimide (PI) is commonly used in flexible circuit boards due to its excellent properties, but its dielectric constant is relatively high for high-frequency communication. To address this, a hyper-crosslinked polymer (HCP) was synthesized and blended with PI to form all-organic HCP/PI composite films. The porous structure of HCP helps to reduce the dielectric constant of the PI matrix. By adjusting the HCP content, the dielectric constant of the composite films can be effectively lowered in the desired frequency range. This method is simple and can be applied to other organic component-filled PI systems.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Crystallography
Cong Ma, Yishuo Wu, Meina Yu, Yanzi Gao, Jiumei Xiao, Cheng Zou, Huai Yang
Summary: This study systematically investigates the effect of molecular structures and doping concentrations of acrylate liquid crystalline monomers (LCMs) on the electro-optical properties and micro-structures of PDLC films. The results suggest that the pore size of polymer networks and the driving voltage of PDLC films are influenced by the molecular polarity and degree of functionality of the LCMs, which in turn affect the electro-optical properties of PDLC films.
Article
Mechanics
Kevin R. Murphy, Jonathan B. Boreyko
Summary: When a sessile droplet contacts an opposing solid surface, the droplet can transfer based on wettabilities and surface velocity. This study used high-speed imaging to capture the transfer process from a solid substrate to a porous surface, varying parameters such as wettability, pore size, droplet volume, and working fluid. The transfer process is divided into wetting and wicking regimes, with wicking being significantly longer than wetting. The wetting regime has two sub-regimes, donor-independent and donor-dependent, while the wicking regime follows Darcy's law to complete the transfer.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Physical
Praveen Malik, Ashwani Kumar Singh
Summary: In this study, polymer dispersed liquid crystals (PDLCs) based smart windows were developed using a thiol-ene-based UV curable photopolymer and nematic liquid crystals (E7). The PDLCs were prepared through polymerization-induced phase separation technique and doped with alumina nanowires (ANWs) at different concentrations to investigate their dispersion effect. The ANWs doping in PDLC resulted in an increase in nematic to isotropic transition temperature, reduction in threshold and saturation voltages, and a decrease in dielectric anisotropy with temperature. The proposed ANWs doped PDLC composite film showed improved transparency and operated at a much lower voltage, which could contribute to the development of fast-switching smart windows and energy-saving devices.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Polymer Science
Haiyu Xian, Lin Li, Yilei Ding, Mingjing Chu, Changqing Ye
Summary: In this study, a fabrication method for dual-responsive electrochromic (EC) polymer dispersed liquid crystal (PDLC) devices was developed. By combining the PDLC technique and a colored complex formed via a redox reaction, an EC PDLC device was prepared using a simple method. The mesogen in the device played dual roles in scattering and participating in redox reactions. Orthogonal experiments were conducted to investigate the electro-optical performance under different factors, resulting in an optimized device with four switchable states modulated by external electric fields. The color and hue of the device can be modulated by variations of mesogen and ionic salt species, solving the limitation of single color in traditional EC devices. This work lays the foundation for patterned multi-colored displays and anti-counterfeiting using screen printing and inkjet printing techniques.
Article
Materials Science, Multidisciplinary
Aleksandra Gridyakina, Natalia Kasian, Mi losz S. Chych Lowski, Marta Kajkowska, Piotr Lesiak
Summary: Multicomponent liquid crystal systems are of great interest in scientific research and practical applications. By combining liquid crystals, polymers, and nanoparticles into a three-component system, it is possible to optimize the performance in display applications and expand the applications of multicomponent systems.
MATERIALS TODAY PHYSICS
(2023)
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
Chemistry, Multidisciplinary
Yunxiao Ren, Wei Hu, Chang Sun, Junyi Huang, Junmei Hu, Jiyuan Shen, Wanli He, Lanying Zhang, Xiaotao Yuan, Meina Yu, Huai Yang
Summary: It was found that adding an appropriate proportion of high-molecular-weight polymer thiol can effectively decrease the saturation voltage of the PDLC films, thereby improving their electro-optical performance. Additionally, the adhesion properties between the substrates and PDLC films are related to the density of the polymer network.
Article
Biochemistry & Molecular Biology
Doina Manaila-Maximean
Summary: This paper studies the effective dielectric properties of heterogeneous materials using the Maxwell Garnet and Bruggeman theory, with applications in various materials. The results can be used in designing electrical circuits by calculating the effective permittivity of composite materials.
Article
Materials Science, Multidisciplinary
Zemin He, Ping Yu, Jianjing Gao, Cheng Ma, Xueyan Feng, Huimin Zhang, Yuzhen Zhao, Zongcheng Miao
Summary: This study demonstrated an effective method to improve the performance of PDLC films by incorporating nano-sized POSS particles into the polymer matrix, achieving lower driving voltages, higher contrast ratios, and verifying stability and switchability. The material system used also contributed to enhanced mechanical strength, maintaining electro-optical properties even in flexible films.
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
Physics, Fluids & Plasmas
Ankur Gupta, Andrew R. Konicek, Mark A. King, Azmaine Iqtidar, Mohsen S. Yeganeh, Howard A. Stone
Summary: The study investigates the effect of gravity on barrel-shaped droplets on fibers through theoretical analyses, numerical simulations, and experiments. It identifies that the contact line position varies sinusoidally with the azimuthal angle around the fiber. The solution is validated by comparing predictions with experimental and numerical results.
PHYSICAL REVIEW FLUIDS
(2021)
Review
Optics
Paolo Minzioni, Roberto Osellame, Cinzia Sada, S. Zhao, F. G. Omenetto, Kristinn B. Gylfason, Tommy Haraldsson, Yibo Zhang, Aydogan Ozcan, Adam Wax, Frieder Mugele, Holger Schmidt, Genni Testa, Romeo Bernini, Jochen Guck, Carlo Liberale, Kirstine Berg-Sorensen, Jian Chen, Markus Pollnau, Sha Xiong, Ai-Qun Liu, Chia-Chann Shiue, Shih-Kang Fan, David Erickson, David Sinton
Article
Biochemistry & Molecular Biology
Taisuke Kojima, Chu-Chi Lin, Shuichi Takayama, Shih-Kang Fan
Article
Chemistry, Analytical
Long Pang, Jing Ding, Yuxin Ge, Jianglin Fan, Shih-Kang Fan
ANALYTICAL CHEMISTRY
(2019)
Review
Chemistry, Analytical
Long Pang, Jing Ding, Xi-Xian Liu, Shih-Kang Fan
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2019)
Article
Chemistry, Physical
Jing Ding, Wen-Quan Tao, Shih-Kang Fan
Review
Chemistry, Analytical
Long Pang, Jing Ding, Xi-Xian Liu, Haoyue Yuan, Yuxin Ge, Jianglin Fan, Shih-Kang Fan
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2020)
Article
Biophysics
Takeshi Komatsu, Manabu Tokeshi, Shih-Kang Fan
Summary: This article introduces a method for detecting blood lithium-ion concentration using digital microfluidics technology and paper-based sensors, achieving rapid and accurate detection through colorimetry.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Analytical
Yu-Shih Chen, Chen-Kuo Tung, Tzu-Hsuan Dai, Xiaohong Wang, Chau-Ting Yeh, Shih-Kang Fan, Cheng-Hsien Liu
Summary: A liver-lobule-mimicking labchip was developed to pattern and culture NIH/3T3 and C3A cells, maintaining high cell viability and biomimicking liver-lobule pattern under different GelMA culturing-microenvironments. Urea assays showed that cells cultured in 5% GelMA chamber had high activity and urea secretion levels, preserving the liver-lobule pattern effectively.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Review
Cell Biology
Long Pang, Jing Ding, Xi-Xian Liu, Zhixuan Kou, Lulu Guo, Xi Xu, Shih-Kang Fan
Summary: Microfluidics technology is widely used in studying intercellular interactions, allowing for precise capture and manipulation of cells, low reagent consumption, and high throughput. In recent years, single-cell level systems for studying intercellular interactions have become increasingly popular.
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY
(2021)
Article
Chemistry, Analytical
Kuan-Lun Ho, Hong-Yu Liao, Helene Minyi Liu, Yen-Wen Lu, Pin-Kuan Yeh, Justin Yu Chang, Shih-Kang Fan
Summary: This study developed a disposable POC cartridge that detects the SARS-CoV-2 N gene with high accuracy and efficiency through digital microfluidics technology. The cartridge has multiple droplet tracks, allowing for multiple tests and controls at once.
Article
Biochemical Research Methods
Fu-Min Wang, I-Pei Lu, Chih-Ting Lin, Shey-Shi Lu, Shih-Kang Fan
Summary: The research indicates that liquid flow from source to drain can be achieved without external pumps by adjusting the difference in electric field strength. Depending on the electric field strength difference, FEPs operate in linear, transition, or saturation regions, with the stability and full occupancy of the virtual microchannel determined by its dimensions.
Review
Cell Biology
Jyong-Huei Lee, Kuan-Lun Ho, Shih-Kang Fan
JOURNAL OF BIOMEDICAL SCIENCE
(2019)
Article
Engineering, Multidisciplinary
Jing-Wei Lin, Da-Shin Wang, Shih-Kang Fan
Proceedings Paper
Engineering, Electrical & Electronic
P. R. Jadhav, Y. T. Cheng, S. K. Fan, C. Y. Liang
2018 IEEE MICRO ELECTRO MECHANICAL SYSTEMS (MEMS)
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Jia-Tai Liao, Yi-Ling Chen, Shih-Kang Fan
30TH IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2017)
(2017)
