Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement

Kim, Hanim; Ryu, Seong Ho; Tuchband, Michael R.; Shin, Tae Joo; Körblová, Eva; Walba, David M.; Clark, Noel A.; Yoon, Dong Ki

doi:10.1126/sciadv.1602102

Cited by 34 publications

(36 citation statements)

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“…These structural parameters are comparable to those previously reported for helical nanofilaments formed by liquid crystals. 75 Using AFM, we were able to assess the vertical thickness (height) of a single HNF@Au@L fiber, to be ∼35 nm ( Figure 2 f–h, Figure S6 ). The small discrepancy between the values of the lateral thickness and height can be explained by the soft character of the composite, which leads to fibers flattening on the substrate.…”

Section: Resultsmentioning

confidence: 99%

“… 56 The final state is a conglomerate structure made of domains with both left and right handedness. Given the possibility of characterizing homochiral domains using far field methods, as well as the versatility and plasticity of soft, 57 − 60 thermotropic LC thin films, these materials can be of high technological relevance. 61 − 65 Recently, some of us demonstrated the incorporation of metal nanoparticles into HNF materials.…”

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confidence: 99%

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Supramolecular Chirality Synchronization in Thin Films of Plasmonic Nanocomposites

et al. 2020

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Mirror symmetry breaking in materials is a fascinating phenomenon that has practical implications for various optoelectronic technologies. Chiral plasmonic materials are particularly appealing due to their strong and specific interactions with light. In this work we broaden the portfolio of available strategies toward the preparation of chiral plasmonic assemblies, by applying the principles of chirality synchronization—a phenomenon known for small molecules, which results in the formation of chiral domains from transiently chiral molecules. We report the controlled cocrystallization of 23 nm gold nanoparticles and liquid crystal molecules yielding domains made of highly ordered, helical nanofibers, preferentially twisted to the right or to the left within each domain. We confirmed that such micrometer sized domains exhibit strong, far-field circular dichroism (CD) signals, even though the bulk material is racemic. We further highlight the potential of the proposed approach to realize chiral plasmonic thin films by using a mechanical chirality discrimination method. Toward this end, we developed a rapid CD imaging technique based on the use of polarized light optical microscopy (POM), which enabled probing the CD signal with micrometer-scale resolution, despite of linear dichroism and birefringence in the sample. The developed methodology allows us to extend intrinsically local effects of chiral synchronization to the macroscopic scale, thereby broadening the available tools for chirality manipulation in chiral plasmonic systems.

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Section: Resultsmentioning

confidence: 99%

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Supramolecular Chirality Synchronization in Thin Films of Plasmonic Nanocomposites

et al. 2020

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Section: Bent-core 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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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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“…In particular, Guo et al ( 34 ) have recently shown that the process based on plasmonic mask photoalignment is a way to produce the desired topological LC defect patterns on demand, although it requires expensive photolithographic tools and does not show reconfigurable characteristics. In contrast to electric or magnetic field controlling the orientation of LC materials in a whole volume, topographical confinement effectively produces more complex and precisely assembled LC structures on a scale of a few micrometers because the confinement can be finely controlled even on the nanometer scale, which provides a rich variety of boundary conditions ( 35 ). The strategy using confinement enables the minimization of the total free energy of the LC structure (bulk elasticity and surface anchoring) in the equilibrium state.…”

Section: Introductionmentioning

confidence: 99%

Mosaics of topological defects in micropatterned liquid crystal textures

et al. 2018

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Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement

Abstract: A perfectly aligned liquid crystal phase can be achieved by an interaction with helical nanofilament under nanoconfinement.

Cited by 34 publications

References 38 publications

Supramolecular Chirality Synchronization in Thin Films of Plasmonic Nanocomposites

Supramolecular Chirality Synchronization in Thin Films of Plasmonic Nanocomposites

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

Mosaics of topological defects in micropatterned liquid crystal textures

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