Crystals
·
2022
·Vol. 12
·期 2
·163
·
IF 2.67
Xiangshen Meng,Jian Li,Yueqiang Lin,Xiaodong Liu,Jianwei Zhao,Decai Li,Zhenghong He
The electro-optical features of the PDLC films applied with a low-frequency square wave voltage were investigated. The transmittance curves indicated the double frequency of the applied voltage at 0–50 Hz, which resulted from the relaxation of an internal electric field polarized by ions in LC droplets. When the local electric field was reversed, the internal polarization electric field could be maintained and superimposed on the local electric field. The relaxation of the internal polarized electric field resulted in the relaxation of the transmittance. Furthermore, the transmittance curves changed with the frequency of the applied voltage.Keywords:PDLC;ion;square-wave voltage;effective electric field
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2018
·
IF 2.636
Yong Wu,Hui Cao,Manyu Duan,Erli Li,Huihui Wang,Zhou Yang,Dong Wang,Wanli He
Polymer dispersed liquid crystal (PDLC) films are fabricated by well-known polymerization-induced phase separation method. In this paper, the dispersion of multi-walled carbon nanotubes (MWCNT) in liquid crystals has been enhanced by chemical modification and we have investigated their effects on the morphology, electro-optical properties and conductivity of the PDLC films. Results indicated that the threshold voltage and the saturation voltage of PDLC films decreased with the increase of the doping concentration of MWCNT or chemically modified MWCNT, because carbon nanotubes can enhance the electric field by reducing the resistivity of the medium and increasing the capacitance of the cells. It can be viewed obviously that the contrast ratio of the PDLC films doped with the chemically modified MWCNT is higher than that of the MWCNT.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
Applied Materials Today
·
2022
·
IF 8.663
Zuhui Shi,Zemin He,Chunsheng Li,Zongcheng Miao,Dong Wang,Yi Luan,Yuzhan Li,Yuzhen Zhao
In this paper, polymer-dispersed liquid crystal (PDLC) films were prepared from a blend of prepolymer, liquid crystal and BaTiO 3 (BTO) nanoparticle-laden nanofibres films by a polymerisation-induced phase separation (PIPS) method. By contrasting the microstructure and electro-optical curves of various proportions of monomer types, it was demonstrated that the hole size of the polymer network had a significant influence on the electro-optical nature of the PDLC films. nanofibres films loaded with different BTO nanoparticle contents were introduced into the liquid crystal mixture specimens, and the alterations in the polymer network, electro-optical nature of these specimens were analysed using SEM images, EDS and electro-optical curves. The electro-optical nature of the nanofibres films doped with PDLCs were found to be improved and the ageing resistance was greatly enhanced. Therefore, the development of PDLC films with faster response times and better electro-optical nature of reticular nanofibres films doped with PDLCs will significantly improve the promising technological applications of PDLC-based equipment for optical windows, displays, energy storage and flexible devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2024
·
IF 2.4
Yuzhen Zhao,Yongle Wu,Xiangke Jiao,Ruijuan Yao,Zhun Guo,Jianjing Gao,Yang Zhao,Dong Wang
In this manuscript, the triple-layer PDLC device with progressive driving function was prepared by integrating three single-layer PDLCs with different electro-optical properties. In comparison with conventional single-layer PDLC, triple-layer PDLC is capable of achieving controllable transmittance by regulating the applied voltage under low-voltage conditions. The optimal ratio and polymerisation conditions were explored by introducing oleic acid modified CeO2 nanospheres and adjusting the polymerisation temperature as well as the UV light intensity. It was found that the polymer network morphology was affected by CeO2 nanospheres content, polymerisation temperature, and UV intensity, which led to changes in the electro-optical properties of the triple-layer PDLC. The samples obtained under the optimal ratio and process conditions exhibited a 77% acceleration in rise response time (ton) compared to the original conditions, while still maintaining excellent progressive driving performance. Its potential for application in the field of intelligent display windows has been significantly enhanced by these advantages.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 2
·508
·
IF 4.2
Yongle Wu,Yuzhen Zhao,Dong Wang
In this paper, the bilayer polymer-dispersed liquid crystals possessing a PDLC-PVA-PDLC structure were prepared by integrating two monolayer PDLCs. The effect of the polymer mesh size on the electro–optical properties of a bilayer PDLC was investigated by comparing the micro-morphology and electro–optical curves under different polymerization conditions. In addition, the impact of doping MoO2nanoparticles with surface modification on the comprehensive performance of the bilayer PDLC was further researched. The contrast ratio of the bilayer PDLC prepared under the optimal conditions was improved by more than 90% and still maintained excellent progressive driving performance. Therefore, the development of a bilayer PDLC with optimal electro-optical properties will significantly enhance the technological prospects for the application of PDLC-based devices in smart windows, displays, and flexible devices.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Hongbo Lu,Peng Huang,Tanyang Wu,Cuifen Chen,Jianzhou Shi,Miao Xu,Longzhen Qiu,Yunsheng Ding,Jun Zhu
A wavelength-selective, two-stage polymerization of acrylate-thiol for the formation of polymer dispersed liquid crystal (PDLC) films is developed. Via this method, the PDLC with microsphere polymer morphology was successfully prepared, which greatly improved the contrast ratio (CR) and adhesion without causing other performance degradation. The change of morphology from the porous to the microsphere structure could be controlled by adjusting the reaction time of the Michael addition reaction. Furthermore, the size and uniformity of the microsphere structure could be controlled by tuning the content of the free radical initiator. This work is expected to provide an effective method to control the microstructure of acrylate-thiol polymers in solution polymerization , and can possibly allow the fabrication of PDLCs with high CR and adhesion, which is of great significance in large, flexible displays, switchable windows, and light valves.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2024
·
IF 2.4
Cuihong Zhang,Ping Yu,Jiaxuan Zhao,Miaomiao Liang,Zemin He,Zongcheng Miao
In this work, the methods of doping different fluorine-containing monomers and fluorine-containing nanoparticles into the mixture were adopted to boost the electro-optical performance of PDLC films. The electro-optical measurements indicate the improved electro-optical performance of PDLCs through the introduction of MX-3 monomer, and the corresponded SEM results demonstrate the successful adjustment of surface morphology. Further doping F-Si@SiO2 nanoparticles into MX-3 monomer-modified PDLC system, the Vth and Vsat values are greatly reduced and reach lowest when F-Si@SiO2 content is 5 wt.%. The enhanced electro-optical property is due to the combined control of fluorine-containing MX-3 monomer and F-Si@SiO2 nanoparticles, the fluorine functional group can promote the uniform dispersion of nanoparticles; the existence of F-Si@SiO2 nanoparticles can regulate the anchoring effect on liquid crystal molecules in the polymer matrix, thus electric-optic characteristics of the PDLC materials are greatly enhanced.
研究领域:
材料科学
·
分子工程
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产品关联
DOI
高影响因子
MOLECULES
·
2026
·Vol. 31
·期 9
·1402
·
IF 5.1
Haokai Wang,Wanghan Sheng,Shikang Zhang,Guanqiao Wang,Yanjun Zhang
Traditional polymer-dispersed liquid crystal (PDLC) faces limitations in smart dimming applications due to high driving voltage and poor high-temperature stability. In this study, a high-birefringence liquid crystal (QYPDLC-901) was used to prepare PDLC films with liquid crystal contents ranging from 72 wt% to 80 wt%, achieved through synergistic regulation of a low-functional acrylic polymer system and a low-intensity curing process. The effects of liquid crystal content, cell gap, and temperature on electro-optical properties were systematically investigated. Optimal performance was obtained at a liquid crystal content of 77 wt%, with a low threshold voltage of 2.9 V, saturation voltage of 7 V, fast response (rise time 4.2 ms, decay time 47 ms), and a favorable balance between high on-state and low off-state transmittance. Microstructural analysis revealed that the superior performance results from uniform droplet dispersion and low interfacial energy. Furthermore, the PDLC exhibited excellent switching stability from 23 °C to 90 °C, maintaining a maximum transmittance of 93% at 90 °C, with increases of only 0.4 V in threshold voltage and 0.1 V in saturation voltage. This study provides an experimental basis for designing smart dimming devices suitable for low-voltage driving and extreme environments.
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DOI
高影响因子
Journal of the Society for Information Display
·
2014
·Vol. 21
·期 12
·511-516
·
IF 0.798
Jun Qian,Feng Gao,Hui-Hui Liu,Chao-Qun Tang,Feng Liu
A reflective CMYK (cyan, magenta, yellow, and black) module using polymer-dispersed liquid crystal (PDLC) is investigated for multi-color reflective display. Combined with the electro-optical properties and visible spectral reflectivity of PDLC films, the color properties of the reflective CMYK module were evaluated in terms of the Uniform Color Space-CIE 1976 L * a * b *. It is found that the blue light reflectivity of the PDLC films is lower than green light and red light reflectivity. With the increase of the voltage applied on PDLC, the color lightness of the CMYK module generally decreases, while the color saturation increases. When the voltage changed from 0 to 70 V with a 5-V change amplitude, modules C, M, Y, and K severally exhibit at least five, six, three, and seven colors.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 35
·23770-23782
·
IF 3.3
Meina Yu,Jianjun Xu,Luoning Zhang,Qian Wang,Cheng Zou,Yanzi Gao,Huai Yang
As a type of smart dimming film, polymer-dispersed liquid crystals (PDLCs) show great prospects in the fields of indoor partition, electronic curtains, and automobile windows. However, its high off-axis haze greatly impacts the application scope. This obvious shortcoming is mainly caused by the serious mismatch between the effective refractive index of the liquid crystal (neff) and the refractive index of the polymer matrix (np) at large viewing angles. Thereby, factors affecting the viewing angle of a PDLC film are analyzed in this research, including the birefringence of the liquid crystal (Δn), film thickness, and the refractive index of the polymer matrix (np). Balanced electro-optical properties are guaranteed simultaneously. It is found that high on-state transmittance and low off-axis haze can be achieved at large viewing angles in the suggested optimized case where Δn is within the range of 0.1–0.13; the film thickness is between 20 μm and 15 μm; and np approaches no but the difference does not exceed 0.03.
研究领域:
材料科学
·
光学
·
电光技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zuowei Zhang,Xian He,Luoning Zhang,Jianjun Xu,Baohua Yuan,Chao Chen,Cheng Zou,Qian Wang,Yanzi Gao,Meina Yu,Huai Yang
A fluorinated polymer dispersed liquid crystal (PDLC) film with low operating voltage and high contrast ratio was successfully fabricated via the ultraviolet-initiated polymerization induced phase separation method. Effects of chemical structure and weight ratio of fluorinated monomers on the properties of PDLC films were systematically investigated through characterization of electro-optical response, micro morphology, optical spectrum and thermal analysis. Compared with the primitive sample, the addition of fluorinated monomers effectively improves the electro-optical properties of the film. The threshold voltage (V th ) is decreased by 39.7 % from 6.3 V to 3.8 V and the saturation voltage is reduced by 30 % from 15.8 V to 11.8 V for a 20 μm-thick film. Besides, the contrast ratio is improved to 110. Meanwhile, its thermal stability and hydrophobic property are also improved. Additionally, due to the abundance of C-O and C-F bonds in these compounds and the porous structure, the prepared film allows for transmittance modulation of sunlight. This research is anticipated to provide an innovative approach to optimize the performance of PDLC films for practical applications.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Dongliang Yang,Xinlin Yao,Shuqing Wang,Yinfu Lu,Xi Chen,Du Lv,Yuzhen Zhao,Zemin He,Huimin Zhang,Xin Du,Yi Luan,Dong Wang
In recent years, polymer dispersed liquid crystals (PDLCs) have demonstrated remarkable application potential in the field of display, information encryption and anti-counterfeiting, but they still have the drawbacks of single color change, suboptimal contrast ratio (CR) and simple anti-counterfeiting modes. Herein, novel PDLC films with electro-optical dual-responsive fluorescence and phosphorescence are prepared to achieve multicolor pattern display and quadruple information encryption by using the strategy of combining phosphorescence and fluorescence with electrically responsive PDLC. The phosphorescent green (PG) and phosphorescent blue (PB) doped PDLC has high CR of 164 and 226. The color pattern display of PDLC is achieved by the electro-optical synergy effect of increasing or decreasing the excitation probability of the light emitting molecules through multiple scattering or transmission of ultraviolet (UV) light by electrically responsive PDLC. Fluorescent red (FLR) particles were incorporated into the PDLC films to augment the anti-counterfeiting ability of PDLC. Various shapes of PDLC films were prepared utilizing screen-printing method, which can manifest multiple optical states of scattered (white), fluorescent (red), and phosphorescent (green and blue) colors under natural light, UV light, and UV light-off, respectively. Furthermore, a sophisticated PDLC (static + dynamic) anti-counterfeiting pattern with quadruple information encryption has been developed by taking advantage of the differences in the afterglow times of different concentrations and types of phosphorescent materials. The PDLC films additionally demonstrate utility in UV pattern printing. In conclusion, this work establishes a solid foundation for the development of future PDLC display, information encryption and anti-counterfeiting materials.
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DOI
高影响因子
危险品化学品经营许可证（带存储）