Low-voltage-driven and highly-diffractive holographic polymer dispersed liquid crystals with spherical morphology

Peng, Haiyan; Yu, Lei; Chen, Guannan; Bohl, Trent William; Ye, Yunsheng; Zhou, Xingping; Xue, Zhigang; Roy, V. A. L.; Xie, Xiaolin

doi:10.1039/c7ra08949j

Cited by 12 publications

(9 citation statements)

References 53 publications

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“…KCD (purity: 99%) was obtained from Acros Organics. The nematic liquid crystal mixture P0616A (n o(589 nm, 293 K) = 1.52, n e(589 nm, 293 K) = 1.72, T N1 = 331 K) [39] was purchased from Shijiazhuang Chengzhi Yonghua Display Material Co., Ltd., China. The hyperbranched acrylate monomer 6361-100 (functionality: 8) was donated as a gift by Eternal Chemical Co., Ltd., China.…”

Section: Methodsmentioning

confidence: 99%

Effect of ketyl radical on the structure and performance of holographic polymer/liquid-crystal composites

et al. 2019

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Holographic polymer/liquid-crystal composites, which are periodically ordered materials with alternative polymer-rich and liquid-crystal-rich phases, have drawn increasing interest due to their unique capabilities of reconstructing colored three-dimensional (3D) images and enabling the electro-optic response. They are formed via photopolymerization induced phase separation upon exposure to laser interference patterns, where a fast photopolymerization is required to facilitate the holographic patterning. Yet, the fast photopolymerization generally leads to depressed phase separation and it remains challenging to boost the holographic performance via kinetics control. Herein, we disclose that the ketyl radical inhibition is able to significantly boost the phase separation and holographic performance by preventing the proliferated diffusion of initiating radicals from the constructive to the destructive regions. Dramatically depressed phase separation is caused when converting the inhibiting ketyl radical to a new initiating radical, indicating the significance of ketyl radical inhibition when designing high performance holographic polymer composites.Scheme 1 Schematic illustration on the conversion of the ketyl radical with an inhibition function to a new initiating radical and the corresponding ordered structures.Scheme 5 Proposed radical diffusion during holographic photopolymerization.

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Section: Methodsmentioning

confidence: 99%

Effect of ketyl radical on the structure and performance of holographic polymer/liquid-crystal composites

et al. 2019

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“…We also studied nonfluorinated LCs, such as the commercially available system P0616A. 31 After being stirred at 70 °C for 7 h, the as-used silanes of TEOS and APTES reacted at the oil−water interface of emulsion via sol−gel process, giving rise to rigid inorganic SiO 2 shells that encapsulated P0616A as the core. Such nonfluorinated LC microcapsules were referred to as PLCs microcapsules.…”

Section: Structural Configurations Of Fluorinated Lcs In Microcapsulesmentioning

confidence: 99%

Liquid Crystals under Confinement in Submicrometer Capsules

et al. 2018

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Liquid crystal (LC) ordering and phase transition behavior under confined conditions have attracted extensive attention and enabled many applications. However, the ordering and phase transition behavior of LCs in submicrometer capsules have seldom been studied, primarily due to the lack of proper capsulizing and visualization approaches to such small LC microcapsules. Herein, we achieve submicrometer LC capsules with the sizes down to 100 nm by using emulsion-based interfacial sol-gel reaction. The behavior of LCs under the submicrometer confinement conditions is investigated while the sizes and chemical composition of the microcapsule shell surface are tuned in a controllable way. The phase transition temperatures of LCs in the submicrometer capsules shift from those of bulk LCs due to the surface-induced ordering of LCs under the strong confinement conditions, which causes formation of topological defects and alters the order parameter. Using nonlinear optical imaging technology, we explore the structures of director field of LCs that arise as a result of the competition between the surface boundary conditions and LC elasticity. The results show that the nanoscale encapsulation can significantly influence the structural configurations of the director and phase transitions of LCs under various confinement conditions.

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“…In spite of the astonishing fast response to visible light irradiation and the long lifetime of the metastable cis ‐configuration, we encounter a poor solubility problem when doping D‐4F in a nematic LC host (e.g., P0616A, Figure a) to form the CLCs . Severe precipitation of D‐4F is clear when cooling down the homogenous D‐4F/P0616A mixture from 120 °C to room temperature.…”

Section: Methodsmentioning

confidence: 99%

Visible Light Rewritable and Long‐Lived Colors in Cholesteric Liquid Crystals: A Facile Co‐Doping Strategy

Zhao

Wang

et al. 2019

Macromol. Rapid Commun.

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Photoresponsive cholesteric liquid crystals (CLCs) are able to selectively reflect colors upon light exposure. Yet, it still remains a formidable challenge to realize simultaneous rewriting and long‐life color in CLCs using visible light. Herein, guided by time dependent density functional theory (TD‐DFT) computation, an octafluorinated binaphthyl azobenzene is synthesized to achieve the fast response and long‐life color upon visible light exposure. Subsequently, based on the solubility parameter, uniform CLCs are formulated through a facile co‐doping strategy. Interestingly, the CLCs change reflection colors from blue to green, red, and then into the near infrared region in seconds upon 550 nm light illumination. The completely reversible process is readily accessable upon 450 nm irradiation. More importantly, each color is independently stable for ≈24 h in the dark.

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Low-voltage-driven and highly-diffractive holographic polymer dispersed liquid crystals with spherical morphology

Abstract: Low-voltage driven and highly diffractive HPDLC gratings were formed by dialing the phase separated microphology through simple LC mixing.

Cited by 12 publications

References 53 publications

Effect of ketyl radical on the structure and performance of holographic polymer/liquid-crystal composites

Effect of ketyl radical on the structure and performance of holographic polymer/liquid-crystal composites

Liquid Crystals under Confinement in Submicrometer Capsules

Visible Light Rewritable and Long‐Lived Colors in Cholesteric Liquid Crystals: A Facile Co‐Doping Strategy

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