Silicon nanostructure-doped polymer/nematic liquid crystal composites for low voltage-driven smart windows

He, Zemin; Yu, Panxi; Zhang, Huimin; Zhao, Yuzhen; Zhu, Yun; Guo, Zhun; Ma, Cheng; Zhang, Haiquan; Miao, Zongcheng; Shen, Wenbo

doi:10.1088/1361-6528/ac3a3b

Cited by 21 publications

(9 citation statements)

References 49 publications

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“…Many previous reports have shown that the electro‐optical properties of PDLCs could be enhanced by doping nanoparticles 28,37,39 . Here, KH570‐SiO 2 nanoparticles with different contents were doped into the PDLC film of samples D1–D5.…”

Section: Resultsmentioning

confidence: 99%

Effects of thiol‐ene click reaction on morphology and electro‐optical properties of polyhedral oligomeric silsesquioxane nanostructure‐based polymer dispersed liquid crystal film

Guo

et al. 2022

Polymers for Advanced Techs

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Polymer dispersed liquid crystals (PDLCs) have lit a flash of interest due to the distinctive property of electrically controlled switching. However, too high‐driving voltage associated with porous polymer networks always limit their wider range of applications. Herein, we reported a PDLC system containing LCs, 2,2′‐(Ethylenedioxy)diethanethiol (DET) with thiol groups, cage‐like nanostructure acrylic polyhedral oligomeric silsesquioxane (KH570‐POSS) and KH570‐SiO2 nanoparticle modified by acrylic groups. The cage‐like KH570‐POSS microstructure was injected to the polymer matrix when KH570‐POSS reacted with DET via thiol‐ene click reaction. The morphological results demonstrated that the droplet size increased with the higher content of DET due to the decrease of the crosslink between the acrylic groups in KH570‐POSS, which results in a less dense of polymer network and thus make the LC droplets easier to be driven in the electric filed. Then, a silica‐based nanoparticle KH570‐SiO2 modified by acrylic groups was introduced into the system. The results indicated that KH570‐SiO2 could replace partial KH570‐POSS to form the polymer network via thiol‐ene click reaction, which increased the compatible ability of SiO2 nanoparticles in the as‐made film. The contrast ratio was increased to 165 when there was nearly 5 wt% content of KH570‐SiO2. Besides, the driving voltage was reduced by almost 60% and the sample could be fully driven by 30 V which is lower than the safe voltage (36 V). This study opens a route for the preparation of commercial PDLC films by thiol‐ene click reaction, enabling the creation of low‐voltage‐driven smart windows.

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Section: Resultsmentioning

confidence: 99%

Effects of thiol‐ene click reaction on morphology and electro‐optical properties of polyhedral oligomeric silsesquioxane nanostructure‐based polymer dispersed liquid crystal film

Guo

et al. 2022

Polymers for Advanced Techs

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“…h) Photographs of the sample without POSS microstructure (top) and the sample containing POSS microstructure (bottom) under the electric field of 0 and 24 V. Reproduced with permission. [89] Copyright 2021, IOP Publishing.…”

Section: Transparency-changing Electrochromism Lc-based Smart Windowsmentioning

confidence: 99%

“…He et al implanted polyhedral oligomeric silsesquioxane (POSS) microstructure into the polymer matrix and successfully fabricated the low-voltage driven smart windows with a large contrast ratio (>100). [89] Thiol polyhedral oligomeric silsesquioxane (POSS-SH) was synthesized and used as the polymerizable monomer for PDLCs (Figure 4d). POSS-SH not only acted as the crosslinker but also contributed to introducing the silica-based nano-size cage structures into the polymer network via the photoinduced thiol-ene polymerization (Figure 4e).…”

Section: Transparency-changing Electrochromism Lc-based Smart Windowsmentioning

confidence: 99%

“…AC electric field (driving voltage is below 36 V or 24 V) He et al [ 86,89] Thermal curing induced phase separation and texture change of Ch-LCs Epoxy-thiol polymer-based PDLCs with microsphere morphology + Ch-LCs with negative dielectric anisotropy Bistable PDLCs High-frequency electric field (100 V, 5 kHz) and low-frequency electric field (100 V, 50 Hz) Hu et al [96] Two Chen et al [80] TIPS method and control of the size distribution of LC droplets Ternary copolymer + nematic LCs PDLCs that electrically control light scattering modulation in the spectral range 300-2300 nm AC electric field Pozhidaev et al [97] Doping nanomaterials with a good shielding effect on infrared light ATO nanoparticles + PDLCs Transmittance change (78.5%-10%) and shielding up to 80.7% of the infrared radiation AC electric field Zhang et al [98] Change between the monoclinic structure and the rutile structure of VO Sang et al [99] Development of novel transparent conducting electrodes SnO 2 -coated hybrid TCE for PDLCs…”

Section: Brief Conclusionmentioning

confidence: 99%

“…g) Visible transmittance spectra of the sample without POSS microstructure (left) and the sample containing POSS microstructure (right) under different states, inset: POM images of the samples under the electric field of 0 V and 24 V. P: polarizer, A: analyzer. h) Photographs of the sample without POSS microstructure (top) and the sample containing POSS microstructure (bottom) under the electric field of 0 and 24 V. Reproduced with permission [89]. Copyright 2021, IOP Publishing.…”

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Recent Progress in Liquid Crystal‐Based Smart Windows: Materials, Structures, and Design

Shen

2022

Laser & Photonics Reviews

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As the vital elements for building environments, windows are utilized to bring light as well as thermal irradiation into the interior places and afford the medium for the communication between the interior and exterior of buildings. Liquid crystal (LC)‐based smart windows, which are mainly made of LC materials or polymer/LC composites, can dynamically modulate light transmittance and regulate the heat radiation entering buildings from the sun via the orientation variation of the LC molecules. Such smart windows play an important role in intelligent buildings and building energy conservation, which contributes to providing a more comfortable and low‐energy‐consumption living environment for mankind. In this review, recent progress in LC‐based smart windows of each category is overviewed. New materials, new ideas, and new methods to improve the performance of conventional LC‐based smart windows and create novel smart window technologies are outlined. Different advanced LC‐based smart window technologies, including electrochromism, thermochromism, photochromism, humidity‐triggered chromism, mechanical self‐powered technique, and dynamic infrared regulating mechanisms, are discussed systematically. The applications of LC‐based smart windows in indoor illumination/privacy protection switching, human‐machine interaction, and thermal regulation for intelligent buildings are highlighted. Last, the challenges and perspectives of LC‐based smart windows are also provided.

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Recent Progress in Functional Dye‐Doped Liquid Crystal Devices

Shen

Zhang

Miao

et al. 2022

Adv Funct Materials

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As a typical representative of dopants, organic functional dyes have demonstrated their significant roles in novel smart liquid crystal (LC) devices, and dye-doped LCs have also been a source of inspiration for scientists to design and fabricate stimuli-gated materials or devices for envisioned applications in a wide range of areas. In this review, the focus on dichroic dyes, fluorescent dyes, and photothermal dyes, and the recent progress of the LC devices employing these dyes as dopants are overviewed. The review highlights the developments of the novel LC devices doped with these dyes. The structures, designs, and applications of these devices are outlined. The underlying principles of dichroic dyes, fluorescent dyes, and photothermal dyes which are utilized as functional dopants in LC devices are first introduced. Subsequently, the novel developments of functional dye-doped LC devices in the application fields of smart windows, attenuators for augmented reality (AR) systems, color-changeable textiles, dichroic color filters, dual-mode circular polarizers, chirality detectors, optical limiters, switchable luminescent solar concentrators, multiple information encryption, anti-counterfeiting, photo-addressed transparent displays, circularly polarized luminescence, tunable lasers, and light-driven soft actuators are discussed. Finally, the challenge and the strategies for the future improvement of dye-doped LC devices are also discussed.

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Silicon nanostructure-doped polymer/nematic liquid crystal composites for low voltage-driven smart windows

Cited by 21 publications

References 49 publications

Effects of thiol‐ene click reaction on morphology and electro‐optical properties of polyhedral oligomeric silsesquioxane nanostructure‐based polymer dispersed liquid crystal film

Effects of thiol‐ene click reaction on morphology and electro‐optical properties of polyhedral oligomeric silsesquioxane nanostructure‐based polymer dispersed liquid crystal film

Recent Progress in Liquid Crystal‐Based Smart Windows: Materials, Structures, and Design

Recent Progress in Functional Dye‐Doped Liquid Crystal Devices

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