Dual mechanochromism of cellulosic cholesteric liquid-crystalline films: wide-ranging colour control and circular dichroism inversion by mechanical stimulus

Miyagi, Kazuma; Teramoto, Yoshikuni

doi:10.1039/c7tc05092e

Cited by 36 publications

(33 citation statements)

References 32 publications

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“…Scientists insisted that a molecule's size could not exceed the size of the unit cell determined by X-ray crystallography and ascribed the unusual properties of polymers to the formation of micelles. [5,6] But Staudinger's concept of macromolecule was eventually accepted and modern polymeric materials have since revolutionized much of human society. [7] Another pertinent example of changing perspectives and theories is the development of nanotechnology or nanoscience.…”

Section: Introductionmentioning

confidence: 99%

Aggregate Science: From Structures to Properties

et al. 2020

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Molecular science entails the study of structures and properties of materials at the level of single molecules or small interacting complexes of molecules. Moving beyond single molecules and well‐defined complexes, aggregates (i.e., irregular clusters of many molecules) serve as a particularly useful form of materials that often display modified or wholly new properties compared to their molecular components. Some unique structures and phenomena such as polymorphic aggregates, aggregation‐induced symmetry breaking, and cluster excitons are only identified in aggregates, as a few examples of their exotic features. Here, by virtue of the flourishing research on aggregation‐induced emission, the concept of “aggregate science” is put forward to fill the gaps between molecules and aggregates. Structures and properties on the aggregate scale are also systematically summarized. The structure–property relationships established for aggregates are expected to contribute to new materials and technological development. Ultimately, aggregate science may become an interdisciplinary research field and serves as a general platform for academic research.

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Section: Introductionmentioning

confidence: 99%

Aggregate Science: From Structures to Properties

et al. 2020

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“…In order to rationalize these results, we considered the following points. Firstly, the expansion of the helical pitch length induced by heating is attribute to not only the reduction of twisting power, but also the expansion of neighboring distance between nematic layers [23]. Secondly, it is known that hydrogen bonding is stronger than van der Walls force.…”

Section: Reflection Properties Of Thermotropic Hpc Derivativesmentioning

confidence: 99%

Thermotropic Cholesteric Liquid Crystals from Cellulose Derivatives with Ester and Carbamate Groups

Hayata

Suzuki

Fukawa

et al. 2019

J. Photopol. Sci. Technol.

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In this report, we synthesized hydroxypropyl cellulose (HPC) derivatives tethering both ester and carbamate groups by chemical modifications of HPC with both alkanoyl chlorides and alkyl isocyanates. They exhibited thermotropic cholesteric liquid crystal (CLC) phase. The differences in side chain lengths and bonding species of HPC derivatives affected the thermotropic CLC properties. We observed visible Bragg reflection from the HPC ester-carbamate derivatives at lower temperature than from those of the HPC esters. Moreover, the shifting wavelength ranges of Bragg reflection of the HPC ester-carbamate derivatives as heating temperature were narrow rather than those of the HPC esters probably due to their hydrogen bonding between carbamate bonds.

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“…19,20 Moreover, SFA can be used as a general platform to study confinement-induced and dynamic phenomena in CLC, e.g. helix inversion [53][54][55][56] , defect nucleation/annihilation and defect-mediated colloidal interactions, 57 and permeative flow 48,[58][59][60][61] . We anticipate that the behavior of the CLC observed during surface approach was very different from the one observed during separation.…”

Section: Figmentioning

confidence: 99%

“…Cano-Grandjean textures have been studied in great details for fixed confinement conditions. 22,23,[52][53][54][55][56][57][58] In the present work, we focused on the response of the CLC to changes of confinement thickness, and measured both the twist angle Φ and normal force as the surface separation distance D was varied.…”

Section: Introductionmentioning

confidence: 99%

Direct measurements of structural forces and twist transitions in cholesteric liquid crystal films with a surface force apparatus

et al. 2019

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Dual mechanochromism of cellulosic cholesteric liquid-crystalline films: wide-ranging colour control and circular dichroism inversion by mechanical stimulus

Abstract: We found that cellulosic liquid-crystalline films displayed not only a wide-ranging colour change but also inversion of circular dichroism upon a mechanical stimulus.

Cited by 36 publications

References 32 publications

Aggregate Science: From Structures to Properties

Aggregate Science: From Structures to Properties

Thermotropic Cholesteric Liquid Crystals from Cellulose Derivatives with Ester and Carbamate Groups

Direct measurements of structural forces and twist transitions in cholesteric liquid crystal films with a surface force apparatus

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