Dual electrically and thermally responsive broadband reflectors based on polymer network stabilized chiral nematic liquid crystals: the role of crosslink density

Khandelwal, Hitesh; Timmermans, Gilles H.; Debije, MG Michael; Schenning, Aphj Albert

doi:10.1039/c6cc04721a

Cited by 30 publications

(29 citation statements)

References 33 publications

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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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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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“…Liquid crystalline polymers (LCPs) are a versatile class of materials with varying applications based on the mesogenic unit and the way these are incorporated in the chain. Applications for side-chain LCPs include displays [1,2] and smart windows [3,4,5]. Main-chain LCPs, the focus of this work, are excellent materials for high performance applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shear Rate on the Orientation and Relaxation of a Vanillic Acid Based Liquid Crystalline Polymer

et al. 2018

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In this study, we report on the visco-elastic response during start-up and cessation of shear of a novel bio-based liquid crystal polymer. The ensuing morphological changes are analyzed at different length scales by in-situ polarized optical microscopy and wide-angle X-ray diffraction. Upon inception of shear, the polydomain texture is initially stretched, at larger strain break up processes become increasingly important, and eventually a steady state texture is obtained. The shear stress response showed good coherence between optical and rheo-X-ray data. The evolution of the orientation parameter coincides with the evolution of the texture: the order parameter increases as the texture stretches, drops slightly in the break up regime, and reaches a constant value in the plateau regime. The relaxation of the shear stress and the polydomain texture showed two distinct processes with different timescales: The first is fast contraction of the stretched domain texture; the second is the slow coalescence of the polydomain texture. The timescale of the orientation parameter’s relaxation matched with that of the slow coalescence process. All processes were found to scale with shear rate in the tested regime. These observations can have far reaching implications for the processing of liquid crystal polymers as they indicate that increased shear rates during processing can correspond to an increased relaxation rate of the orientation parameter and, therefore, a decrease in anisotropy and material properties after cooling.

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“…Recent review articles report the possibility to tune the optical response with a highly effective external stimulus, such as the electric field [4][5][6][7][8]. Some of the latest articles describe reflectors based on chiral liquid crystals in polymer network that respond to electric and thermal stimuli [9] and electroresponsive photonic structures that combine structural and electrochromic effects [10]. Other materials employed in photonic structures to enable tuning are photochromic materials [11,12], or heavily-doped semiconductor nanocrystals [13,14].…”

Section: Introductionmentioning

confidence: 99%

Light-induced switching in pDTE–FICO 1D photonic structures

Kriegel

Scotognella

2018

Optics Communications

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We propose the design of 1D photonic crystals and microcavities in which fluorine-indium codoped cadmium oxide (FICO) nanocrystal based layers and layers of diarylethene-based polyester (pDTE) are alternated or embedded in a microcavity. The irradiation with UV light results in two different behaviours: i) it dopes the FICO nanocrystals inducing a blue shift of their plasmonic resonances; ii) it changes the real part of the refractive index of the photochromic pDTE polymer. These two behaviours are combined in the proposed photonic structures and can be useful for switchable filters and cavities for light emission.

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Dual electrically and thermally responsive broadband reflectors based on polymer network stabilized chiral nematic liquid crystals: the role of crosslink density

Abstract: A broadband reflector based on a polymer stabilized chiral nematic liquid crystal has been fabricated. The reflection bandwidth can be manually controlled by an electric field and autonomously by temperature.

Cited by 30 publications

References 33 publications

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

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

Effect of Shear Rate on the Orientation and Relaxation of a Vanillic Acid Based Liquid Crystalline Polymer

Light-induced switching in pDTE–FICO 1D photonic structures

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