Electric field studies of liquid crystal droplet suspensions

Groot, Eleanor M. De; Fuller, Gerald G.

doi:10.1080/026782997208721

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…Conjugation of Congo red molecules is stabilized by π–π interactions. The resulting supramolecular dye fibrils may form species resembling nanowire structures enabling significant electron delocalization upon the influence of the electric field (De Groot and Fuller 1997 ; Li et al 2006 ; Sardone et al 2006 ).…”

Section: Resultsmentioning

confidence: 99%

Influence of the electric field on supramolecular structure and properties of amyloid-specific reagent Congo red

et al. 2011

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Among specific amyloid ligands, Congo red and its analogues are often considered potential therapeutic compounds. However, the results of the studies so far have not been univocal because the properties of this dye, derived mostly from its supramolecular nature, are still poorly understood. The supramolecular structure of Congo red, formed by π–π stacking of dye molecules, is susceptible to the influence of the electric field, which may significantly facilitate electron delocalization. Consequently, the electric field may generate altered physico-chemical properties of the dye. Enhanced electron delocalization, induced by the electric field, alters the total charge of Congo red, making the dye more acidic (negatively charged). This is a consequence of withdrawing electrons from polar substituents of aromatic rings—sulfonic and amino groups—thus increasing their tendency to dissociate protons. The electric field-induced charge alteration observed in electrophoresis depends on dye concentration. This concentration-dependent charge alteration effect disappears when the supramolecular structure disintegrates in DMSO. Dipoles formed from supramolecular fibrillar species in the electric field become ordered in the solution, introducing the modified arrangement to liquid crystalline phase. Experimental results and theoretical studies provide evidence confirming predictions that the supramolecular character of Congo red is the main reason for its specific properties and reactivity.

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Section: Resultsmentioning

confidence: 99%

Influence of the electric field on supramolecular structure and properties of amyloid-specific reagent Congo red

et al. 2011

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“…Nematic emulsions are dispersions of nematic liquid crystal droplets in a continuous isotropic solvent. In the past, they have been the object of both theoretical and experimental studies. − In particular, investigations have dealt with emulsion (nonclassical interaction and structure) and liquid crystal (defects and stability) points of view. The presence of an anisotropic fluid in the emulsions changes the nature of interactions between dispersed droplets and host matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surfactant Molecules on the Electrooptical Properties of Nematic Emulsions

et al. 2000

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Switchable nematic emulsions can be obtained by fast cooling of isotropic mixtures of nematic liquid crystal and monomers. Films obtained with this procedure show very low saturation fields but rather long relaxation times. In this paper, we doped nematic emulsions with different percentages of surfactant agents to obtain a good compromise between low saturation fields and fast relaxation times. The decay time decreases in a significant way, and the saturation field is slightly affected by the additional small amounts of surfactant. Experimental results are shown to be in rather good agreement with a phenomenological model.

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Effect of spherical geometry on the dynamics of the photostimulated nematic-isotropic transition

Gollapelli

Pathinti

Kalra³

et al. 2021

Optical Materials

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Electric field studies of liquid crystal droplet suspensions

Cited by 9 publications

References 19 publications

Influence of the electric field on supramolecular structure and properties of amyloid-specific reagent Congo red

Influence of the electric field on supramolecular structure and properties of amyloid-specific reagent Congo red

Effect of Surfactant Molecules on the Electrooptical Properties of Nematic Emulsions

Effect of spherical geometry on the dynamics of the photostimulated nematic-isotropic transition

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