Plasmonic‐Enhanced Cholesteric Films: Coassembling Anisotropic Gold Nanorods with Cellulose Nanocrystals

Cheng, Zheng; Ma, Yi; Yang, Lin; Cheng, Feng; Huang, Zhongjie; Natan, Avi; Li, Hongyan; Chen, Yong; Cao, Daxian; Huang, Zhifeng; Wang, YuHuang; Liu, Yongmin; Yang, Rendang; Zhu, Hongli

doi:10.1002/adom.201801816

Cited by 50 publications

(56 citation statements)

References 54 publications

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“…The latter feature is particularly interesting from the perspective of plasmonic and metamaterial technologies since it leads to, for example, induced plasmonic chirality, as has already been shown for lyotropic LC systems. [128][129][130][131] In the case of thermotropic LC composites two basic preparative approaches toward LC nanocomposites involve either i) the use of mesogenic molecules as nanoparticle surface ligands or ii) the use of LC phases as a host matrix. [132,133] Regarding the former, formation of chiral LC phase from cholesterol-derivative-grafted Au NPs was claimed, [125] based on the observation of enhancement of CD signal in the UV bands characteristic of organic matter (at 200 and 260 nm), at the isotropic liquid to mesophase transition (Figure 8c).…”

Section: Emerging Applications Related To Chirality Transfer In Liquimentioning

confidence: 99%

Chirality of Liquid Crystals Formed from Achiral Molecules Revealed by Resonant X‐Ray Scattering

et al. 2020

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effect is also responsible for some "biological recognition" processes, including, for example, our physiological response to odor or taste of opposite enantiomeric species. Although chiral interactions have been broadly studied, the mechanism that leads to single handedness in our world is still under discussion. For example, Viedma [1] showed that deracemization in the solid state, coupled with flexibility of transforming one enantiomeric form into another in the liquid state, may lead to chirality synchronization, that is, in a system that starts from a mixture of racemic crystals, a homochiral end state can be obtained. Similarly, crystallization combined with reversible organic reactions, have been reported to transform initially achiral reactants into an enantiopure solid. [2] Whether the spontaneous formation of a homochiral state from a racemic mixture or achiral molecules can be observed in a fluid phase, is still uncertain. In general, in racemic systems lacking long range positional correlations, the chirodiastaltic forces are probably too weak to achieve spontaneous deracemization and (through amplification) enantiomeric excess. Also, in the liquid crystal (LC) state with only orientational order (nematic phase, N), spontaneous deracemization has not been observed so far, since rod-like molecules forming the N phase have freedom to rotate around their long axes, and thus the chiral discrimination effect is reduced. [3] Only few examples have been reported in which chiral discrimination was found to strongly affect nematic phase stability, but not lead to deracemization. [4] There is, however, a particularly interesting group of achiral mesogenic molecules with (constitutional or conformational) bent geometry, for which rotation is strongly hindered and therefore local interactions between neighboring molecules are expected to be much stronger than those in rod-like molecules. In fact, bent molecules have been shown to spontaneously form structurally chiral domains through chirality synchronization in the isotropic liquid [5] and LC [6,7] phases. Thus, further exploration of chirality in soft systems, such as LCs, may have high relevance toward better understanding the origin of life and be transformative for various technologies relying on chirality in soft matter systems. Testing chirality in soft matter systems (liquid crystals and solid crystals) is not always trivial. The most commonly used tools are optical methods focusing on measurements of optical activity (i.e., the ability of matter to rotate the polarization

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Section: Emerging Applications Related To Chirality Transfer In Liquimentioning

confidence: 99%

Chirality of Liquid Crystals Formed from Achiral Molecules Revealed by Resonant X‐Ray Scattering

et al. 2020

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“…Moreover, free‐standing chiral plasmonic composite films were designed by coassembling anisotropic plasmonic gold nanorods (GNRs) and rod‐like CNCs. [ 46 ] The effects of surface charge and the concentration of the GNRs on the structure and optical properties of the CNC/GNR films were systematically examined. The CNC/GNR hybrid films retained the photonic characteristic of the CNCs host while concomitantly possessed the plasmonic resonance of GNRs.…”

Section: Structures and Chemical Components Of Trunkmentioning

confidence: 99%

“…The chiral plasmonic hybrid films showed tunable plasmatic optical properties, e.g., controlling the color of the film by modifying the zeta potential of CNF/GNR hybrid films by adding different content of gold nanorods (Figure 6c). [ 46 ] Another study fabricated CNC‐based stimuli‐responsive stretchable optics by mixing CNCs with an elastomer. [ 47 ] Vivid colors appeared when the film was stretched and disappeared when the elastomer returned to its original shape (Figure 6d).…”

Section: Structures and Chemical Components Of Trunkmentioning

confidence: 99%

Biopolymers Derived from Trees as Sustainable Multifunctional Materials: A Review

Liu

Luan

et al. 2020

Advanced Materials

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The world is currently transitioning from a fossil‐fuel‐driven energy economy to one that is supplied by more renewable and sustainable materials. Trees as the most abundant renewable bioresource have attracted significant attention for advanced materials and manufacturing in this epochal transition. Trees are composed with complex structures and components such as trunk (stem and bark), leaf, flower, seed, and root. Although many excellent reviews have been published regarding advanced applications of wood and wood‐derived biopolymers in different fields, such as energy, electronics, biomedical, and water treatment, no reviews have revisited and systematically discussed functional materials and even devices derived from trees in a full scope yet. Therefore, a timely summary of the recent development of materials and structures derived from different parts of trees for sustainability is prsented here. A concise introduction to the different parts of the trees is given first, which is followed by the corresponding chemistry and preparation of functional materials using various biopolymers from trees. The most promising applications of biopolymer‐based materials are discussed subsequently. A comprehensive review of the different parts of trees as sustainable functional materials and devices for critical applications is thus provided.

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“…HNF has the potential to be used as a template to induce chirality in achiral organic/inorganic materials because of its chiral shape and firmness [77][78][79][80][81][82][83]. If the chirality transfer succeeds in metal nanoparticles [84], fluorescence dye, and additional LC molecules, various chiroptical applications can be rationalized, for example, tailored polarization rotation [82], photonic metamaterial [85], chiral fluorescence [86], etc.…”

Section: Template For Chiral Assembly Of the Guest Materialsmentioning

confidence: 99%

Orientation Control of Helical Nanofilament Phase and Its Chiroptical Applications

Park

Yoon

2020

Crystals

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Chiral liquid crystal phases show fascinating structural and optical properties due to their inherent helical characteristics. Among the various chiral liquid crystal phases, the helical nanofilament phase, made of achiral bent-shaped molecules, has been of keen research interest due to its unusual polar and chiral properties. This review is intended to introduce the recent progress in orientation control and its application to the helical nanofilament phase, which includes topographic confinement, photoalignment, and chiroptical applications such as photonic crystal and chirality sensor.

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Plasmonic‐Enhanced Cholesteric Films: Coassembling Anisotropic Gold Nanorods with Cellulose Nanocrystals

Cited by 50 publications

References 54 publications

Chirality of Liquid Crystals Formed from Achiral Molecules Revealed by Resonant X‐Ray Scattering

Chirality of Liquid Crystals Formed from Achiral Molecules Revealed by Resonant X‐Ray Scattering

Biopolymers Derived from Trees as Sustainable Multifunctional Materials: A Review

Orientation Control of Helical Nanofilament Phase and Its Chiroptical Applications

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