Amphiphilic Cyclodextrin-Based Liquid Crystals for Proton Conduction

Champagne, Patrick; Ester, David; Polan, Danielle M; Williams, Vance E.; Thangadurai, Venkataraman; Ling, Chang‐Chun

doi:10.1021/jacs.8b13888

Cited by 25 publications

(16 citation statements)

References 47 publications

(73 reference statements)

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“…Several groups have also recently reported proton conduction using an organized structure with thermotropic and lyotropic LC properties [104][105][106][107][108][109][110]. Ohno and co-workers reported anisotropic proton conduction by a self-assembled lyotropic columnar structure using phosphonium-type zwitterions and bis-(trifluoromethanesulfonyl)imide [111].…”

Section: Other Recent Organized Films With Proton-conductive Channelsmentioning

confidence: 99%

Progress on highly proton-conductive polymer thin films with organized structure and molecularly oriented structure

Nagao

2020

Science and Technology of Advanced Materials

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Several current topics are introduced in this review, with particular attention to highly protonconductive polymer thin films with organized structure and molecularly oriented structure. Organized structure and molecularly oriented structure are anticipated as more promising approaches than conventional less-molecular-ordered structure to elucidate mechanisms of high proton conduction and control proton conduction. This review introduces related polymer materials and molecular design using lyotropic liquid crystals and hydrogen bond networks for high proton conduction. It also outlines the use of substrate surfaces and external fields, such as pressure and centrifugal force, for organizing structures and molecularly oriented structures.

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Section: Other Recent Organized Films With Proton-conductive Channelsmentioning

confidence: 99%

Progress on highly proton-conductive polymer thin films with organized structure and molecularly oriented structure

Nagao

2020

Science and Technology of Advanced Materials

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“…A clear shift of the phase transition temperatures of both homo and block copolymers to higher temperatures with increasing size of the polymers was found indicating a remarkable influence of the PMMA block on the phase behaviour of the polymers; in other words, the increase of the size of the non LC block enhances the stability of the LC phase. 33,34 In order to investigate the phase sequence of LC phase structures of these LC homo and block copolymers, temperature-dependent synchrotron-based small/wide-angle X-ray scattering experiments were performed for all the compounds. The sharp peaks with a ratio of 1:2:3 in the small-angle X-ray region indicate that all of the polymers form layered mesomorphic superstructures, i.e., smectic phases; unfortunately GISAXS experiments on thin films did not .…”

Section: Liquid Crystalline Performance Of the Cholesterol Derived Homo And Bcpsmentioning

confidence: 99%

Self-Assembly and Temperature-Driven Chirality Inversion of Cholesteryl-Based Block Copolymers

Velmurugan

Chen

et al. 2020

Macromolecules

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Block copolymers (BCPs) comprising of a poly(methyl methacrylate) (PMMA) block and a poly(cholesteryloxyhexyl methacrylate block (PChMA) were synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. The self-assembly of the liquid crystalline block copolymers was characterized by differential scanning calorimetry (DSC), 1 polarized optical microscopy (POM) and synchrotron-based small-angle X-ray scattering (SAXS). The results indicate the formation of both tilted and non-tilted chiral smectic (SmC* and SmA*) phases. A phase transition from SmA* to SmC* phase on cooling was observed for BCPs, but not for PChMA homopolymers. The layer spacing (5.00 ± 0.18 nm) between those can be controlled to maintain the number of ChMA units whilst varying the lengths of the PMMA block, introducing thus systematically the SmC* phase. Furthermore, BCPs with short PMMA block showed inversion of chirality at specific temperatures; while for PChMA attached with long PMMA block no chirality inversion was observed. This mode of chirality switching, investigated by CD, NMR, and theoretical studies, is associated with the methyl substituents in the backbone affecting the packing of the polymers. The basic rules, described here, have the potential to be implemented for the design of a wide range of functional materials where helix-helix conversion is of use. helix-helix transitions in nature and has the potential to be exploited further for artificial systems. ASSOCIATED CONTENT Supporting InformationExperimental methods, NMR, DSC, POM, SAXS, WAXS, CD and theoretical calculation results are included in the supporting information.

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“…Possibly, dendrimers are rather symmetrical in chemical structures, which is advantageous for the easy formation of columnar phases [36][37][38][39][40][41][42][43][44][45][46][47][48][49]. The symmetrical structural feature favoring mesophase formation of dendrimers was adopted for several dendrons which self-assembled into dendrimers through H-bond interaction [50][51][52][53][54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Converting non-Mesogenic to Mesogenic Stacking of Amino-s-Triazine-Based Dendrons with p-CN Phenyl Unit by Eliminating Peripheral Dipole

Hsu

Yang

et al. 2022

Nanomaterials

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Three new amino-s-triazine-based dendrons, 1a, 1b, and 1c, containing an aryl-CN moiety in the dendritic skeleton were prepared in 72–81% yields (1a: R1 = − N(n-C8H17)2, R2 = n-OC8H17, 1b: R1 = R2 = − N(n-C8H17)2, 1c: R1 = − N(n-C8H17)2, R2 = − N(n-C4H9)2). Dendrons 1a with N(n-C8H17)2 and n-OC8H17 peripheral substituents, surprisingly, did not show any mesogenic phase during the thermal process. However, non-mesogenic 1a can be converted to mesogenic 1b or 1c by eliminating the peripheral dipole arising from the alkoxy substituent; dendron 1b only comprising the same N(n-C8H17)2 peripheral groups showed a ~25 °C mesogenic range on heating and ~108 °C mesogenic range on cooling. In contrast, dendron 1c possessing different N(n-CmH2m+1)2 (m = 8 versus m = 4) peripheral units, having similar stacking as 1b, exhibited a columnar phase on thermal treatment, but its mesogenic range (~9 and ~66 °C on heating and cooling, respectively) was much narrower than that of 1b, attributed to 1c’s less flexible alkyl chains in the peripheral part of dendron. Dendron 1a with the alkoxy substituent in the peripheral skeleton, creating additional dipole correspondingly, thus, leads to the dendritic molecules having a non-mesogenic stacking. Without the peripheral dipole for intermolecular side-by-side interaction, dendrons 1b and 1c exhibit a columnar phase on thermal treatment because of the vibration from the peripheral alkyl chain.

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Amphiphilic Cyclodextrin-Based Liquid Crystals for Proton Conduction

Cited by 25 publications

References 47 publications

Progress on highly proton-conductive polymer thin films with organized structure and molecularly oriented structure

Progress on highly proton-conductive polymer thin films with organized structure and molecularly oriented structure

Self-Assembly and Temperature-Driven Chirality Inversion of Cholesteryl-Based Block Copolymers

Converting non-Mesogenic to Mesogenic Stacking of Amino-s-Triazine-Based Dendrons with p-CN Phenyl Unit by Eliminating Peripheral Dipole

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