Optical intensity-driven reversible photonic bandgaps in self-organized helical superstructures with handedness inversion

Sun, Jian; Yu, Li; Wang, Ling; Li, Chenyue; Yang, Zhou; He, Wanli; Zhang, Cuihong; Zhang, Lanying; Xiao, Jiumei; Yuan, Xiao; Li, Fasheng; Yang, Huai

doi:10.1039/c7tc00534b

Cited by 51 publications

(34 citation statements)

References 59 publications

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“…Feringa and co-workers pioneered the sterically overcrowded alkenes with intrinsic helical conformations which could induce the handedness inversion of cholesteric LCs as chiral photoswitches. [239][240][241][242][243][244][245] For example, the compound (P)-a exhibits a right-handed helix with the initial HTP of +5.9 µm −1 in nematic host M15 (Figure 9a, top). [246] UV Irradiation leads to the photoisomerization into photostationary left-handed (M)-a with an overall HTP of −9.6 µm −1 .…”

Section: Cholesteric Superstructures Exhibiting Chirality Inversionmentioning

confidence: 99%

“…Many strategies have been developed for the rational molecular design of single chiral molecular photoswitches that could confer handedness inversion capability to cholesteric LCs, but the event of light‐driven handedness inversion using such methodology is often encountered by chance. Feringa and co‐workers pioneered the sterically overcrowded alkenes with intrinsic helical conformations which could induce the handedness inversion of cholesteric LCs as chiral photoswitches . For example, the compound ( P )‐ a exhibits a right‐handed helix with the initial HTP of +5.9 µm −1 in nematic host M15 ( Figure a, top) .…”

Section: Chirality In Thermotropic Liquid Crystalsmentioning

confidence: 99%

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Nature‐Inspired Emerging Chiral Liquid Crystal Nanostructures: From Molecular Self‐Assembly to DNA Mesophase and Nanocolloids

2018

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Liquid crystals (LCs) are omnipresent in living matter, whose chirality is an elegant and distinct feature in certain plant tissues, the cuticles of crabs, beetles, arthropods, and beyond. Taking inspiration from nature, researchers have recently devoted extensive efforts toward developing chiral liquid crystalline materials with self-organized nanostructures and exploring their potential applications in diverse fields ranging from dynamic photonics to energy and safety issues. In this review, an account on the state of the art of emerging chiral liquid crystalline nanostructured materials and their technological applications is provided. First, an overview on the significance of chiral liquid crystalline architectures in various living systems is given. Then, the recent significant progress in different chiral liquid crystalline systems including thermotropic LCs (cholesteric LCs, cubic blue phases, achiral bent-core LCs, etc.) and lyotropic LCs (DNA LCs, nanocellulose LCs, and graphene oxide LCs) is showcased. The review concludes with a perspective on the future scope, opportunities, and challenges in these truly advanced functional soft materials and their promising applications.

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Section: Cholesteric Superstructures Exhibiting Chirality Inversionmentioning

confidence: 99%

Section: Chirality In Thermotropic Liquid Crystalsmentioning

confidence: 99%

Nature‐Inspired Emerging Chiral Liquid Crystal Nanostructures: From Molecular Self‐Assembly to DNA Mesophase and Nanocolloids

2018

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“…Among various types of ordered nanoarchitectures, photonic liquid crystals (PLCs) of 2D nanomaterials have attracted recent attention owing to the ability of dynamically interacting with the light of interest to achieve brilliant reflection colors (11). Generally, the color of PLCs originates from the periodic structures with long-range positional ordering, such as lamellar or helical arrangement (12)(13)(14)(15)(16)(17). In particular, lamellar structure is one of the most studied designs for fabricating photonic materials of 2D building blocks due to the structural similarity to natural nacre and pearls (18).…”

mentioning

confidence: 99%

Iridescence in nematics: Photonic liquid crystals of nanoplates in absence of long-range periodicity

Zeng

King

Huang

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Photonic materials with positionally ordered structure can interact strongly with light to produce brilliant structural colors. Here, we found that the nonperiodic nematic liquid crystals of nanoplates can also display structural color with only significant orientational order. Owing to the loose stacking of the nematic nanodiscs, such colloidal dispersion is able to reflect a broad-spectrum wavelength, of which the reflection color can be further enhanced by adding carbon nanoparticles to reduce background scattering. Upon the addition of electrolytes, such vivid colors of nematic dispersion can be fine-tuned via electrostatic forces. Furthermore, we took advantage of the fluidity of the nematic structure to create a variety of colorful arts. It was expected that the concept of implanting nematic features in photonic structure of lyotropic nanoparticles may open opportunities for developing advanced photonic materials for display, sensing, and art applications.

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“… 8 The photonic properties of Ch–LCs stem from their intrinsic helical structure, with a selective reflection of light that is related to the length of the helical pitch. 20 , 21 When in proper planar alignment, Ch–LCs are highly transparent to light outside the reflection band. Temperature-responsive color change in Ch–LCs is caused by a change in the pitch length.…”

Section: Introductionmentioning

confidence: 99%

Reversible Thermochromic Photonic Coatings with a Protective Topcoat

Zhang

Schenning

Kragt

et al. 2021

ACS Appl. Mater. Interfaces

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The fabrication of reversible and robust thermochromic coatings remains challenging. In this work, a temperature-responsive photonic coating with a protective topcoat is fabricated. A cholesteric oligosiloxane liquid crystal possessing a smectic-to-cholesteric phase-transition temperature response is synthesized. A planar alignment of its cholesteric phase is possible with blade coating. By stabilizing with 3 wt % of a crosslinked liquid crystal network, the photonic coating shows a color change ranging from red to blue upon heating. High transparency is retained, and the structural color changes are fully reversible. A transparent polysiloxane layer can be directly applied on top of the cholesteric layer to protect it against damage without affecting its optical properties. This approach satisfies the basic requirements of thermochromic polymer coatings, as it combines easy processability, coating robustness, and a reversible temperature response.

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Optical intensity-driven reversible photonic bandgaps in self-organized helical superstructures with handedness inversion

Abstract: Optical intensity-driven self-organized helical superstructures were found to exhibit reversibly photodynamical photonic bandgaps in wavelength shifting, bandwidth broadening and reflectance enhancing in single-layer system.

Cited by 51 publications

References 59 publications

Nature‐Inspired Emerging Chiral Liquid Crystal Nanostructures: From Molecular Self‐Assembly to DNA Mesophase and Nanocolloids

Nature‐Inspired Emerging Chiral Liquid Crystal Nanostructures: From Molecular Self‐Assembly to DNA Mesophase and Nanocolloids

Iridescence in nematics: Photonic liquid crystals of nanoplates in absence of long-range periodicity

Reversible Thermochromic Photonic Coatings with a Protective Topcoat

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