Electrooptical Behavior of Aqueous (Hydroxypropyl)cellulose Liquid Crystals Containing Imidazolium Salts

Ito, Mitsuhiro; Teramoto, Yoshikuni; Nishio, Yoshiyuki

doi:10.1021/bm201757d

Cited by 8 publications

(5 citation statements)

References 12 publications

(31 reference statements)

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“…Ionic mesogens can also play a useful role as additives to existing thermotropic or lyotropic LC systems, in applications where their ionic nature is important . They may be applied as nonvolatile phase-change (energy-storage) materials as well, as has already been shown for [C 16 mim][Br] and [C 16 dmim][Br] .…”

Section: Applications Of Ionic Liquid Crystalsmentioning

confidence: 99%

Ionic Liquid Crystals: Versatile Materials

et al. 2016

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This Review covers the recent developments (2005-2015) in the design, synthesis, characterization, and application of thermotropic ionic liquid crystals. It was designed to give a comprehensive overview of the "state-of-the-art" in the field. The discussion is focused on low molar mass and dendrimeric thermotropic ionic mesogens, as well as selected metal-containing compounds (metallomesogens), but some references to polymeric and/or lyotropic ionic liquid crystals and particularly to ionic liquids will also be provided. Although zwitterionic and mesoionic mesogens are also treated to some extent, emphasis will be directed toward liquid-crystalline materials consisting of organic cations and organic/inorganic anions that are not covalently bound but interact via electrostatic and other noncovalent interactions.

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Section: Applications Of Ionic Liquid Crystalsmentioning

confidence: 99%

Ionic Liquid Crystals: Versatile Materials

et al. 2016

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“…A similar electro-optical phenomenon was observed in aqueous HPC liquid crystals containing an IL additive of the ([CnMim][X]) type [64]. A timeevolving gradation in reflective color or optical clarity of the lyotropics was attained by imposing a relatively weak electromotive force (e.g.,~4.5 V) onto appropriate electrodes (e.g., twins of carbon plate) in contact with the sample sealed in a cell.…”

Section: Dynamic Control Of Chiral Nematic Pitch and Optical Propertiesmentioning

confidence: 57%

“…4 and 6). A significant example of such functional development is the ion-mediated dynamic manipulation of cholesteric coloration and optical turbidity by using electrical stimulation of HPC lyotropics, including swollen gels [10,[61][62][63][64]. In the first demonstration [61], conventional metallic salts were employed as additive ions to shift P and/or T c .…”

Section: Dynamic Control Of Chiral Nematic Pitch and Optical Propertiesmentioning

confidence: 99%

Liquid Crystals of Cellulosics: Fascinating Ordered Structures for the Design of Functional Material Systems

Nishio

Sato

Sugimura

2015

Advances in Polymer Science

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This article surveys progress in both fundamental and applied research related to cellulosic liquid crystals, mainly of chiral nematic order. These liquid crystals are divided into two different classes, namely cellulosic macromolecules and cellulose nanocrystals (CNCs), depending on the mesogenic constituent. We start with a review of the fundamental and chiroptical characteristics of molecular liquid crystals of representative cellulose derivatives and then discuss recent efforts on the design and construction of functional material systems (such as stimulisensitive optical media and novel hybrids with minerals). These systems make use of the liquid crystalline molecular assembly of cellulosics. The survey of the other class of cellulosic liquid crystals deals with colloidal suspensions of CNCs obtained by acid hydrolysis of native cellulose fibers. Following the review of fundamental aspects related to the isotropic-anisotropic phase separation behavior of CNC suspensions, attention is directed to current applications of free-standing colored films, polymer composites reinforced with CNCs as mesofiller, and inorganic hybridizations using CNC chiral nematics as template. Some comments and the outlook for future explorations are also offered.

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“…The selective light reflection, as well as the optical turbidity of the liquid crystalline cellulose derivatives solutions can be tuned, not only by the application of external fields [6,7], but also by the addition of aqueous salt solvents [8] and by playing with solvent/cellulose derivative systems [9,10,11]. The dynamic control of the cholesteric coloration and optical clarity of lyotropic aqueous cellulose derivatives was more recently achieved by using various N-alkyl-substituted methylimidazolium salts and a weak electric field [12,13]. The electro-optical behavior of the system was interpreted in terms of the salt-containing liquid-crystalline system and the medium viscous electrolytic and high resistance characteristics [12].…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic control of the cholesteric coloration and optical clarity of lyotropic aqueous cellulose derivatives was more recently achieved by using various N-alkyl-substituted methylimidazolium salts and a weak electric field [12,13]. The electro-optical behavior of the system was interpreted in terms of the salt-containing liquid-crystalline system and the medium viscous electrolytic and high resistance characteristics [12]. In order to improve the optical characteristics of the solutions the treatment of surfaces, as well as the use of solvents that decrease the viscosity of the liquid crystalline cellulose solutions was investigated [14].…”

Section: Introductionmentioning

confidence: 99%

From Cellulosic Based Liquid Crystalline Sheared Solutions to 1D and 2D Soft Materials

2014

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Liquid crystalline cellulosic-based solutions described by distinctive properties are at the origin of different kinds of multifunctional materials with unique characteristics. These solutions can form chiral nematic phases at rest, with tuneable photonic behavior, and exhibit a complex behavior associated with the onset of a network of director field defects under shear. Techniques, such as Nuclear Magnetic Resonance (NMR), Rheology coupled with NMR (Rheo-NMR), rheology, optical methods, Magnetic Resonance Imaging (MRI), Wide Angle X-rays Scattering (WAXS), were extensively used to enlighten the liquid crystalline characteristics of these cellulosic solutions. Cellulosic films produced by shear casting and fibers by electrospinning, from these liquid crystalline solutions, have regained wider attention due to recognition of their innovative properties associated to their biocompatibility. Electrospun membranes composed by helical and spiral shape fibers allow the achievement of large surface areas, leading to the improvement of the performance of this kind of systems. The moisture response, light modulated, wettability and the capability of orienting protein and cellulose crystals, opened a wide range of new applications to the shear casted films. Characterization by NMR, X-rays, tensile tests, AFM, and optical methods allowed detailed characterization of those soft cellulosic materials. In this work, special attention will be given to recent developments, including, among others, a moisture driven cellulosic motor and electro-optical devices.

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Electrooptical Behavior of Aqueous (Hydroxypropyl)cellulose Liquid Crystals Containing Imidazolium Salts

Cited by 8 publications

References 12 publications

Ionic Liquid Crystals: Versatile Materials

Ionic Liquid Crystals: Versatile Materials

Liquid Crystals of Cellulosics: Fascinating Ordered Structures for the Design of Functional Material Systems

From Cellulosic Based Liquid Crystalline Sheared Solutions to 1D and 2D Soft Materials

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