A roll-to-roll process for multi-responsive soft-matter composite films containing Cs<sub>x</sub>WO<sub>3</sub> nanorods for energy-efficient smart window applications

Liang, Xiao; Guo, Chongshen; Chen, Mei; Guo, Shumeng; Zhang, Lanying; Li, Fasheng; Guo, Shaojun; Yang, Huai

doi:10.1039/c7nh00105c

Cited by 128 publications

(100 citation statements)

References 30 publications

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“…Cs x WO 3 film was chosen as the photo-thermal component because of its high NIR shielding, effective photothermal conversion, and high transmittance in the visible region. 13,27,31,40 °C. This is because that PNIPAM microgels are relatively hydrophilic and they are in a highly swollen state with water at 22 °C, while they become relatively hydrophobic and highly shrunken at 36 °C.…”

Section: Fabrication Of Cs X Wo 3 /Pam-pnipam Windows the Process Fomentioning

confidence: 99%

Spectrally Selective Smart Window with High Near-Infrared Light Shielding and Controllable Visible Light Transmittance

Shi

et al. 2018

ACS Appl. Mater. Interfaces

157

109

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Smart windows with high near-infrared (NIR) light shielding and controllable visible light transmittance are highly sought after for cooling energy saving in buildings. Herein we present a rationally designed spectrally selective smart window which is capable of shielding 96.2% of the NIR irradiation from 800 nm to 2500 nm and at the same time permitting acceptable visible light (78.2% before and 45.3% after its optical switching) for indoor daylighting. The smart window synergistically integrates the highly selective and effective NIR absorption based photothermal

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Section: Fabrication Of Cs X Wo 3 /Pam-pnipam Windows the Process Fomentioning

confidence: 99%

Spectrally Selective Smart Window with High Near-Infrared Light Shielding and Controllable Visible Light Transmittance

Shi

et al. 2018

ACS Appl. Mater. Interfaces

157

109

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“…As reported in the literature, in the first step a porous polymer network is obtained by UV irradiation of isotropic acrylate monomers (IAMs). Secondly, an electric field is applied simultaneously with UV-light exposure, the liquid crystal acrylate monomers (LAMs) within the ChLC domains being crosslinked to form homeotropically aligned polymer fibers in the porous matrix [22][23][24][25]. During the first stage some of the LAMs are consumed by radical polymerization under UV light.…”

Section: Introductionmentioning

confidence: 99%

“…During the first stage some of the LAMs are consumed by radical polymerization under UV light. To leave sufficient LAMs for forming the oriented polymer fibers in the second UV polymerization step, the curing time of UV irradiation in the first stage should be strictly controlled, which is not beneficial for the polymer morphology control or further optimization of the electro-optical properties of the PD&SChLC film [22][23][24][25]. To date, liquid-crystalline vinyl-ether monomers (LVMs) have not been investigated in constructing a PD&SChLC system.…”

Section: Introductionmentioning

confidence: 99%

Electro-Optical Properties of a Polymer Dispersed and Stabilized Cholesteric Liquid Crystals System Constructed by a Stepwise UV-Initiated Radical/Cationic Polymerization

Wang

Liang

et al. 2019

Crystals

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Polymer-dispersed liquid crystal (PDLC) and polymer-stabilized liquid crystal (PSLC) are two typical liquid crystal (LC)/polymer composites. PDLCs are usually prepared by dispersing LC droplets in a polymer matrix, while PSLC is a system in which the alignment of LC molecules is stabilized by interactions between the polymer network and the LC molecules. In this study, a new material system is promoted to construct a coexistence system of PDLC and PSLC, namely PD&SChLC. In this new material system, a liquid-crystalline vinyl-ether monomer (LVM) was introduced to a mixture containing cholesteric liquid crystal (ChLC) and isotropic acrylate monomer (IAM). Based on the different reaction rates between LVM and IAM, the PD&SChLC architecture was built using a stepwise UV-initiated polymerization. During the preparation of the PDS&ChLC films, first, the mixture was irradiated with UV light for a short period of time to induce the free radical polymerization of IAMs, forming a phase-separated microstructure, PDLC. Subsequently, an electric filed was applied to the sample for long enough to induce the cationic polymerization of LVMs, forming the homeotropically-aligned polymer fibers within the ChLC domains, which are similar to those in a PSLC. Based on this stepwise UV-initiated radical/cationic polymerization, a PD&SChLC film with the advantages of a relatively low driving voltage, a fast response time, and a large-area processability is successful prepared. The film can be widely used in flexible displays, smart windows, and other optical devices.

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“…Heating an unaltered amorphous polymer sheet above its T g , stretching the material, and cooling the sheet below T g stores strain in the polymer . Industrially, strained polymer sheets are made through numerous methods including blown film extrusion, roll‐to‐roll processing, or film casting . These processes impart uniaxial or biaxial strain within the sheet to alter the overall geometry based on the intended application.…”

Section: Introductionmentioning

confidence: 99%

Shape memory polymers for self‐folding via compression of thermoplastic sheets

Hubbard

Davis

Dickey

et al. 2018

J of Applied Polymer Sci

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We report a simple method to strain, and thereby program, shape memory polymers by compressing planar thermoplastic sheets. This work is motivated by the limited number of commercially available prestrained polymer sheets; current examples include: Shrinky Dinks, Eastman's Embrace, and polyurethane shrink films. However, these commercial specimens limit the sample thickness, polymer composition, and amount of stored strain. We show here that melt pressing can strain thermoplastic sheets over a range of thicknesses and polymer chemical compositions. After pressing (and thus, straining), the polymer sheets can self-fold out-of-plane into complex geometries using two different actuation mechanisms, both of which locally release strain stored in the polymer. Threedimensional geometries are attained experimentally with both thick (~12 mm) and thin (~1 mm) strained polymer samples with a range of polymer compositions. Digital image correlation maps the strain profile within the melt pressed samples while a Mooney-Rivlin and geometric model predicts the average strain and folding response of the samples, respectively. The model predictions agree well with experimental results. These findings enable self-folding with a broader design space such as polymer chemical composition, sample thickness, strain within the sample, and external stimulus. Techniques presented here should translate to other thermoplastic polymers, thus making this technique a viable tool to increase the available pool of materials available for self-folding devices.

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A roll-to-roll process for multi-responsive soft-matter composite films containing Cs_xWO₃ nanorods for energy-efficient smart window applications

Abstract: This work provides a roll-to-roll processed flexible multi-responsive smart film containing tungsten bronze nanorods and a liquid crystal–polymer composite.

Cited by 128 publications

References 30 publications

Spectrally Selective Smart Window with High Near-Infrared Light Shielding and Controllable Visible Light Transmittance

Spectrally Selective Smart Window with High Near-Infrared Light Shielding and Controllable Visible Light Transmittance

Electro-Optical Properties of a Polymer Dispersed and Stabilized Cholesteric Liquid Crystals System Constructed by a Stepwise UV-Initiated Radical/Cationic Polymerization

Shape memory polymers for self‐folding via compression of thermoplastic sheets

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A roll-to-roll process for multi-responsive soft-matter composite films containing CsxWO3 nanorods for energy-efficient smart window applications

Abstract: This work provides a roll-to-roll processed flexible multi-responsive smart film containing tungsten bronze nanorods and a liquid crystal–polymer composite.

Cited by 128 publications

References 30 publications

Spectrally Selective Smart Window with High Near-Infrared Light Shielding and Controllable Visible Light Transmittance

Spectrally Selective Smart Window with High Near-Infrared Light Shielding and Controllable Visible Light Transmittance

Electro-Optical Properties of a Polymer Dispersed and Stabilized Cholesteric Liquid Crystals System Constructed by a Stepwise UV-Initiated Radical/Cationic Polymerization

Shape memory polymers for self‐folding via compression of thermoplastic sheets

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A roll-to-roll process for multi-responsive soft-matter composite films containing Cs_xWO₃ nanorods for energy-efficient smart window applications