Ionic Discotic Liquid Crystals: Recent Advances and Applications

Pal, Santanu Kumar; Kumar, Sandeep

doi:10.1002/9781118773826.ch9

Cited by 14 publications

(15 citation statements)

References 108 publications

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“…1 Gradually other organic cations, such as substituted imidazolium, phosphonium, and viologen (1,1′disubstituted 4,4′-bipyridinium) cores, were also used to obtain mesomorphic salts. In the past few years, ILCs based on pyrrolidinium, piperidinium, morpholinium, piperazinium, εcaprolactam, guanidinium, triazolium, pyrazolium, benzobis-(imidazolium), quinolinium, isoquinolinium, pyrimidinium, 1,10-phenanthrolinium, bis(amidinium), protonated merocyanine and fulleropyrrolidinium cations, besides large positively charged fused ring systems and protonated cyclo [8]pyrrole, have been reported as well (Scheme 1). Interest in especially the quaternary ammonium, pyridinium, imidazolium, phosphonium, and viologen ILCs arose from their relatively facile preparation by quaternization with alkyl halides.…”

Section: Other Types Of Liquid Crystalsmentioning

confidence: 99%

“…2 Review articles that have appeared since then and that partially cover the field of ILCs include those of Axenov, Mansueto, and Laschat, 3,4 Douce et al, 5 Chen and Eichhorn, 6 Causin and Saielli, 7 and Pal and Kumar. 8 The present contribution was designed to give a comprehensive overview of the "state-of-theart" in the field. It covers the recent developments (2005−2015) in the design, synthesis, characterization, and application of thermotropic ILCs.…”

Section: Introductionmentioning

confidence: 99%

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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: Other Types Of Liquid Crystalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ionic Liquid Crystals: Versatile Materials

et al. 2016

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“…Highlighting past studies on ILCs, several excellent review articles on ILCs have already been published by Binnemans et al, , Laschat et al, Dauce et al, Chen and Eichhorn, Causin and Saielli, Pal and Kumar, Fernandez and Kouwer, Kato et al, , and Sijbesma and Schenning . They mainly focused on fundamental aspects, structures, and specific properties of ILCs, but the applications of ILCs have not yet been discussed in a comprehensive manner.…”

Section: Introductionmentioning

confidence: 99%

Functional Ionic Liquid Crystals

2020

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Ionic liquid crystals have emerged as a new class of functional soft materials in the last two decades, and they exhibit synergistic characteristics of ionic liquids and liquid crystals such as macroscopic orientability, miscibility with various species, phase stability, nanostructural tunability, and polar nanochannel formation. Owing to these characteristics, the structures, properties, and functions of ionic liquid crystals have been a hot topic in materials chemistry, finding various applications including host frameworks for guest binding, separation membranes, ion-/proton-conducting membranes, reaction media, and optoelectronic materials. Although several excellent review articles of ionic liquid crystals have been published recently, they mainly focused on the fundamental aspects, structures, and specific properties of ionic liquid crystals, while these applications of ionic liquid crystals have not yet been discussed at one time. The aim of this feature article is to provide an overview of the applications of ionic liquid crystals in a comprehensive manner.

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“…Ionic liquid crystals (ILCs) combine the physical properties of ionic liquids with those of thermotropic liquid crystals [1][2][3][4][5][6][7][8] and thus provide highly desirable materials for anisotropically ordered 1D ion conductors in organic solar cells 9,10 and as solid electrolytes in lithium ion batteries. 11 While ILCs share many similarities with neutral thermotropic liquid crystals, they differ in the occurrence of certain mesophases.…”

Section: Introductionmentioning

confidence: 99%

“…11 While ILCs share many similarities with neutral thermotropic liquid crystals, they differ in the occurrence of certain mesophases. [1][2][3][4][5][6][7][8] The strong tendency of ILCs to nanosegregate ionic and non-charged segments during liquid crystalline self-assembly leads to a strong preference of the non-tilted SmA phase as their archetypal mesophase, while for example the tilted SmC phase is much less common among ILCs. [12][13][14][15][16] We have previously identied ILCs 1, 2 showing rare SmC phases (Scheme 1), which consist of a calamitic core unit carrying one side chain and a exible spacer connected to a cationic head group.…”

Section: Introductionmentioning

confidence: 99%