Polymer-Dispersed Cholesteric Liquid Crystals Reflecting In the Infrared Region

Mănăilă-Maximean, Doina; Roşu, Constantin; Kłosowicz, Stanisław J.; Czupryński, K.; Gilli, J. M.; Aleksander, Marek

doi:10.1080/15421400490478830

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…Zhang et al prepared an electrically induced coloration CLC film with broadband reflection causing a temperature variation of 2.6 °C via polymerization-induced pitch gradient method [ 31 ]. D. Manaila-Maximean et al reported polymer-dispersed CLCs reflecting in the infrared region using the photopolymerization-induced phase separation method [ 32 ]. A photoresponsive CLC composed of photoresponsive chiral photochromic dopant, non-photoresponsive chiral dopant, and nematic LCs was prepared, and the CLC exhibited color change between red and blue upon ultraviolet light irradiation [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature Self-Adaptive and Color-Adjustable Smart Window Based on Templated Cholesteric Liquid Crystals

Sun,

2023

Polymers

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Cholesteric liquid crystals (CLCs) exhibit selective reflection due to their self-assembled helical superstructures. Reconfigurable templates can achieve integration functions via inducing processes of molecular assemblies. Here we demonstrate temperature self-adaptive and color-adjustable smart windows using CLCs, which are fabricated via the templating method and exhibit simultaneous reflections in the visible and infrared spectra. Reflection bands formed by the refilled CLC materials can be adjusted reversibly both upon thermal and electrical actuation. In CLC with adjustable reflection in the infrared, the central wavelength of the infrared reflection band can be adjusted from 950 nm to 1305 nm via temperature, and from 1150 nm to 950 nm via electric field. A temperature variation of 10.3 °C within 55 s was induced by the single-layer templated CLC cell, and a comfortable temperature range could be effectively maintained by the CLC cell in a varied environment. In CLC with dynamic color in the visible spectrum, color shifts from 530 nm to 650 nm tuned by temperature and from 530 nm to 440 nm adjusted by electric field were obtained. Temperature-responsive reflection in the infrared spectrum contributes to automatic thermal management, and electric-field-induced band shift in the visible spectrum enables active dynamic color adjustment. The presented templated CLC smart windows show considerable potential in energy conservation and biological clock regulation fields.

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Section: Introductionmentioning

confidence: 99%

Temperature Self-Adaptive and Color-Adjustable Smart Window Based on Templated Cholesteric Liquid Crystals

Sun,

2023

Polymers

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“…Previous work has described temperature-responsive photonic reflectors, many based on chiral nematic (cholesteric) liquid crystals (LCs). [16][17][18][19][20][21][22][23] Cholesteric LC systems are able to reflect light as a result of their self-organized molecular helices. Because of their liquid nature, these systems show a large temperature response but need to be sandwiched between two glass plates (in a cell architecture), 16,[24][25][26] which may not be practical or feasible in some instances, and in many cases, the temperature response of these polymers is limited and/or requires adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Paintable temperature-responsive cholesteric liquid crystal reflectors encapsulated on a single flexible polymer substrate

et al. 2019

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“…The widely known polymer dispersed-liquid crystals (PDLCs) are a class of liquid crystal (LC)-based electro-optical devices, formed by LC droplets dispersed in a solid polymeric matrix [ 1 – 5 ]. The optical transmission of such devices is sensitive to external AC electric fields.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of a liquid crystal dispersed in an electrospun cellulose acetate network

Maximean¹,

Dănilă²,

Almeida³

et al. 2018

Beilstein J. Nanotechnol.

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Electro-optical devices that work in a similar fashion as PDLCs (polymer-dispersed liquid crystals), produced from cellulose acetate (CA) electrospun fibers deposited onto indium tin oxide coated glass and a nematic liquid crystal (E7), were studied. CA and the CA/liquid crystal composite were characterized by multiple investigation techniques, such as polarized optical microscopy, dielectric spectroscopy and impedance measurements. Dielectric constant and electric energy loss were studied as a function of frequency and temperature. The activation energy was evaluated and the relaxation time was obtained by fitting the spectra of the dielectric loss with the Havriliak-Negami functions. To determine the electrical characteristics of the studied samples, impedance measurements results were treated using the Cole-Cole diagram and the three-element equivalent model. 155

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Polymer-Dispersed Cholesteric Liquid Crystals Reflecting In the Infrared Region

Cited by 11 publications

References 6 publications

Temperature Self-Adaptive and Color-Adjustable Smart Window Based on Templated Cholesteric Liquid Crystals

Temperature Self-Adaptive and Color-Adjustable Smart Window Based on Templated Cholesteric Liquid Crystals

Paintable temperature-responsive cholesteric liquid crystal reflectors encapsulated on a single flexible polymer substrate

Electrical properties of a liquid crystal dispersed in an electrospun cellulose acetate network

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