Temperature dependence of the pitch in chiral lyotropic chromonic liquid crystals

Ogolla, Timothy; Paley, Robert S.; Collings, Peter J.

doi:10.1039/c8sm02091d

Cited by 21 publications

(21 citation statements)

References 41 publications

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“…For chiral mixtures DSCG was dissolved in 10%w/w L‐alanine water solution following literature. [ 20–23 ] Oxazine perchlorate (less than 1‰ w/w) was added to DSCG solution. For KCl tests the L‐alanine was prepared in 0.1 and 0.01 m KCl solutions.…”

Section: Methodsmentioning

confidence: 99%

Induced Chiral Chromonics Confined in Micrometric Droplets

Pellegrino

Santo

Spina

et al. 2021

Adv Funct Materials

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Chirality emergence in biological systems is common but the chiral expression from the molecular to macroscopic level in water‐based systems is poorly understood. Among water‐based systems, chromonic liquid crystals have recently received a lot of attention due to the spontaneous chirality they show when confined in curved geometries. Confinement of chiral‐induced chromonics is not trivial since they are three component systems whose time stability is a delicate thermodynamic balance. In this work, a well‐defined periodic Frank–Pryce texture, typical of chiral thermotropic liquid crystals, is observed in microspheres of a chiral induced chromonic embedded in a poly(dimethylsiloxane) matrix. This texture slowly degrades in time and a possible mechanism behind the degradation process is suggested via X‐ray diffraction and atomic force microscopy measurements on thin chromonic films. To stabilize this texture and to control the structure periodicity, cations are added to the three components system in an attempt to tune the non‐covalent interactions between molecules and supramolecular stacks. The study of the effects of this addition allows for better insight into the molecular interactions that occur in the chiral induced mesophase. This is a crucial point in view of possible biocompatible technological applications.

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Section: Methodsmentioning

confidence: 99%

Induced Chiral Chromonics Confined in Micrometric Droplets

Pellegrino

Santo

Spina

et al. 2021

Adv Funct Materials

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“…where k 3 and α are as in (12) and in (13). The integration in t, which delivers (11) in the main text, is independent of the specific function g, provided it is monotonic and obeys the prescribed boundary conditions.…”

Section: Appendix A: Retracted Tangential Fieldmentioning

confidence: 96%

“…CLC molecules are typically plank-shaped with aromatic cores and polar groups on their peripheries [12]. They tend to stack face-to-face so as to form columns that order into a fluid nematic phase or (for higher concentrations or lower temperatures) even in a solid-like medium phase, where columns are organized parallel to one another with their centres arranged in an hexagonal pattern [2].…”

Section: Introductionmentioning

confidence: 99%

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Shape Bistability in Squeezed Chromonic Droplets

Paparini,

Virga

2021

Preprint

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We study droplets of chromonic liquid crystals squeezed between parallel plates inducing degenerate tangential anchoring on the nematic director. In the coexistence regime, where droplets in the nematic phase are at equilibrium with the surrounding melt, our two-dimensional theoretical model predicts a regime of shape bistability for sufficiently large bipolar droplets, where tactoids (pointed shapes) and discoids (smooth shapes) coexist in equilibrium. This phenomenon has not yet been observed. Two-dimensional droplets of disodium cromoglycate (DSCG) have been the object of a thorough experimental study [Y.-K. Kim et al., J. Phys.: Condens. Matter 25, 404202 (2013)]. We show that our theory is in good quantitative agreement with these data and extract from them what promises to be a more accurate estimate for the isotropic surface tension at the nematic/melt interface of DSCG.

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“…40,41 This distance is determined through X-ray studies of chromonic systems. 2,3,26,33,40,[42][43][44][45][46][47][48][49][50][51] Additionally, chromonic molecules are also known to display unique optical textures when observed under a polarized optical microscope.…”

Section: Properties Of Chromonic Moleculesmentioning

confidence: 99%

Recent progress in functional materials from lyotropic chromonic liquid crystals

Bosire

Ndaya

Kasi

2020

Polymer International

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Research on lyotropic chromonic liquid crystals has grown tremendously from fundamental studies to designing functional materials for applications in biological fields and other technological areas. The majority of the research has centered on utilizing chromonic small molecules predominantly dissolved in aqueous solvents. But these often present processing difficulties and a host of other unattractive features including poor mechanical and chemical stabilities. Mesophase properties of chromonic liquid crystals as characterized using X-ray diffraction and scattering techniques, spectroscopy and light microscopy are explored. We review potential applications and future perspectives of this subfield where methods of transforming chromonic molecules into functional materials are highlighted.

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Temperature dependence of the pitch in chiral lyotropic chromonic liquid crystals

Cited by 21 publications

References 41 publications

Induced Chiral Chromonics Confined in Micrometric Droplets

Induced Chiral Chromonics Confined in Micrometric Droplets

Shape Bistability in Squeezed Chromonic Droplets

Recent progress in functional materials from lyotropic chromonic liquid crystals

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