Electric‐Field‐Responsive Lithium‐Ion Conductors of Propylenecarbonate‐Based Columnar Liquid Crystals

Shimura, Hiroko; Yoshio, Masafumi; Hamasaki, Atsushi; Mukai, Tomohiro; Ohno, Hiroyuki; Kato, Takashi

doi:10.1002/adma.200802252

Cited by 95 publications

(77 citation statements)

References 35 publications

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“…The LiTFSI mixtures were placed on the electrodes and heated above the isotropic point and the ionic conductivity was then measured on cooling to room temperature. 22 This observation suggests that molecules with a similar structure exhibit in a layered phase a higher conductivity than in the columnar phase. 4) the substances 4a, 4b and 4c and their mixtures with LiTFSI align in the smectic phase when they are cooled from the isotropic melt.…”

Section: Conductivity Measurementsmentioning

confidence: 99%

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Structure and ionic conductivity of liquid crystals having propylene carbonate units

et al. 2015

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Liquid-crystalline compounds with a perfluorinated aromatic ring as the mesogenic core and a propylene carbonate unit were prepared and mixed with lithium bis(trifluoro-methanesulfonyl)-imide (LiTFSI). The self-assembly was driven by the interaction of the polar propylene carbonate unit. Thus it is one of the few examples of liquid crystals with only one phenyl group that is able to self-assemble. Small-and Wide angle X-ray scattering (SAXS/WAXS) measurements indicate that the molecules spontaneously formed a smectic phase. Calculation of the Li-salt dissociation from the data obtained by a combination of impedance spectroscopy measurements and diffusion experiments by 7 Li and 19 F pulsed field gradient (PFG) NMR revealed good dissociation properties of the compounds. The complex of (2-Oxo-1,3dioxolan-4-yl)methyl 4-(decyloxy)-2,3,5,6-tetrafluorobenzoate (4b) with LiTFSI exhibited anisotropic conductivity. The conductivity parallel to the smectic orientation was 125 times higher than perpendicular and is one of the best reported for liquid crystals with propylene carbonate fragments. † Electronic supplementary information (ESI) available: DSC diagrams for the mixtures of 4a, 4b and 4c with various amounts of LiTFSI; WAXS/SAXS of 4a and 4b mixed with 10 mol% LiTFSI, ionic conductivity measurements for 4b, 6 and 8 with various amounts of LiTFSI; NMR spectra of all compounds discussed in this paper. See

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Section: Conductivity Measurementsmentioning

confidence: 99%

“…An alternative could be liquid crystals with cyclic carbonates as the moiety enhancing salt dissociation. 22 However, the ionic conductivity of 2.2 Â 10 À8 S cm À1 at 22 C is relatively low. [11][12][13][14] Until now, the focus has been mainly on liquid crystals with poly(ethylene oxide) (PEO) moieties.…”

Section: Introductionmentioning

confidence: 99%

Structure and ionic conductivity of liquid crystals having propylene carbonate units

et al. 2015

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“…For the alignment of columnar liquid crystals, various new techniques have been produced, such as applications of electric 189,190 and magnetic fields, 191,192 and other methods. [193][194][195][196] For compound 33a, the macroscopic alignment of columns has been achieved by magnetic fields and the preservation of the 1D nanostructures has been also carried out.…”

Section: Functional Lc Polymers and Networkmentioning

confidence: 99%

Functional liquid-crystalline polymers and supramolecular liquid crystals

Kato

Uchida

Ichikawa

et al. 2017

Polym J

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100

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The design and functions of liquid-crystalline (LC) polymers with classifying them into conventional-, supramolecular-, dendriticand network-type LC polymers are described. LC polymers show new functions as new devices in the field of energy and environment by incorporating mesogenic moieties exhibiting photonic, electronic and ionic functions. Supramolecular LC polymers show dynamic and unique properties because the mesogenic moieties are built with non-covalent interactions. Dendritic-type LC polymers exhibit liquid crystallinity by nanosegregation of aromatic and aliphatic moieties. Dendritic fork-like mesogens have also been prepared. A variety of nonmesogeic functional building blocks including fullerene, π-conjugated moieties, catenane, rotaxane and others can be incorporated into LC phases by attaching these dendritic moieties. LC networks are constructed in situ polymerization of polymerizable nematic or nanostructured liquid crystals. The specific characteristics of the LC networks have generated new research trends to develop well-defined polymers that exhibit optical, transport and separation properties. In these materials, through suitable design of LC monomers, the preservation of smectic, columnar and bicontinuous cubic phases has been successfully used for the development of membranes with one-dimensional, two-dimensional and three-dimensional nanostructures.

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“…Very recently, we have succeeded in the induction of columnar order by applying electric fields. 31 However, precise control of molecular order is still challenging. nancial support.…”

Section: ç Summary and Outlookmentioning

confidence: 99%

Electro- and Photoactive Molecular Assemblies of Liquid Crystals and Physical Gels

Kato¹,

Tanabe²

2009

Chemistry Letters

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Self-organized structures of liquid crystals and self-assembled fibers have great potential as new functional materials. This article highlights self-organization of -conjugated molecules, leading to the induction of photonic, electronic, and electrochemical properties. Ç IntroductionSoft materials such as polymers, gels, and liquid crystals have attracted much attention because of their dynamic properties and easy processiblities.1-12 Our strategy has been to develop new functional soft materials that show dynamic function using ordered molecular assemblies. [4][5][6][7][8]12 Liquid crystals are unique because molecular order and dynamic states are combined.3-8 Liquid crystals exhibit a variety of ordered nanostructures as well as the simplest nematic structures that are widely used for informational display. Nanostructures of liquid crystals such as bicontinuous cubic, smectic, columnar, and micellar cubic phases (Figure 1) can serve as ordered functional materials. Phase transitions of these liquid-crystalline (LC) structures can also be used for the induction of dynamic properties. Unconventional molecular shapes as well as simple rod and disk shapes can function as mesogens. [3][4][5][6][7]13 Moreover, control of intermolecular interactions such as hydrogen bonding, ionic interactions, and charge-transfer interactions as well as -and van der Waals interactions is important in the design of these ordered soft materials.5-8 Physical gels are soft composite materials consisting of solvents and self-assembled networks of gelators. 10-12These gels form microphase-separated structures (Figure 2a). Gelators are low-molecular-weight molecules that form one-dimensional fibrous solid aggregates through hydrogen bonding or -interactions. The physical gels show sol-gel transitions because of noncovalent assembly. We have developed LC physical gels as a new class of soft materials (Figure 2b). For these materials, anisotropic solvents serve as functional fluids or templates for ordering of fibrous aggregates.In this highlight review, we focus on our recent development of electro-and photofunctional liquid crystals and physical gels. Our basic materials design is the introduction of electro-and photoactive moieties such as -conjugated systems into the molecular components of liquid crystals and physical gels. These functional groups align in the LC nanostructures, which result in the induction of anisotropy and enhanced functions. As the first topic, we describe electroactive liquid crystals based on oligothiophene, triphenylene, and viologen. We then show some examples of photoactive LC materials. In the last section, electro-and photoactive gels are described.

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Electric‐Field‐Responsive Lithium‐Ion Conductors of Propylenecarbonate‐Based Columnar Liquid Crystals

Cited by 95 publications

References 35 publications

Structure and ionic conductivity of liquid crystals having propylene carbonate units

Structure and ionic conductivity of liquid crystals having propylene carbonate units

Functional liquid-crystalline polymers and supramolecular liquid crystals

Electro- and Photoactive Molecular Assemblies of Liquid Crystals and Physical Gels

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