Sugar Amphiphiles as Revealing Dopants for Induced Chiral Nematic Lyotropic Liquid Crystals

Minden, H.M von; Vill, V.; Pape, M.; Hiltrop, K.

doi:10.1006/jcis.2000.7395

Cited by 12 publications

(9 citation statements)

References 14 publications

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“…This cannot be explained only by changes in the polarity of the head group; in this case it is more likely that the stereochemistry of the carbohydrate head group has a very strong influence on the interaction between the molecules even in dilute solutions. This holds especially true for the trisaccharide OMT where the long-range chirality transfer should be much higher than for disaccharides [22]. Taking this into account, it can be assumed that with increasing concentration of the surfactant the diastereomeric interaction between the sugar head groups of OMT is getting much stronger than for the disaccharide head groups.…”

Section: Surface Tension and Geometric Propertiesmentioning

confidence: 96%

Structures of micelles formed by synthetic alkyl glycosides with unsaturated alkyl chains

Milkereit

Garamus²,

Veermans

et al. 2005

Journal of Colloid and Interface Science

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Section: Surface Tension and Geometric Propertiesmentioning

confidence: 96%

Structures of micelles formed by synthetic alkyl glycosides with unsaturated alkyl chains

Milkereit

Garamus²,

Veermans

et al. 2005

Journal of Colloid and Interface Science

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“…For H TP > 0, the wave number Q * of the twist pitch linearly increases with increasing φ P at dilute solutions, consisting with the experiments. [41][42][43][44] The temperature and concentration dependences of H TP are given through the ratio S P /S L . Some estimations of the parameters have been studied in our previous paper.…”

Section: Appendix: Mixtures Of a Nematic Liquid Crystal And A Chiral mentioning

confidence: 99%

Phase diagrams of mixtures of a polymer and a cholesteric liquid crystal under an external field

Matsuyama

2014

The Journal of Chemical Physics

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We present a mean field theory to describe phase behaviors in mixtures of a polymer and a cholesteric liquid crystal under an external magnetic or electric field. Taking into account a chiral coupling between a polymer and a liquid crystal under the external field, we examine twist-untwist phase transitions and phase separations in the mixtures. It is found that a cholesteric-nematic phase transition can be induced by not only the external field but also concentration and temperature. Depending on the strength of the external field, we predict cholesteric-paranematic (Ch+pN), nematic-paranematic (N+pN), cholesteric-nematic (Ch+N) phase separations, etc., on the temperature-concentration plane. We also discuss mixtures of a non-chiral nematic liquid crystal and a chiral dopant.

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“…For H TP > 0, the wave number Q of the twist pitch linearly increases with increasing φ P at dilute solutions, which is consistent with the experiments. 1,[53][54][55] The temperature and concentration dependences of H TP are given through the ratio S P /S L . Figure 12 shows the ratio S P /S L of two orientational order parameters plotted against the reduced-temperature for various values of n with φ P = 0.01.…”

Section: Mixtures Of a Nematic Liquid Crystal And A Chiral Dopantmentioning

confidence: 99%

Theory of polymer-dispersed cholesteric liquid crystals

Matsuyama

2013

The Journal of Chemical Physics

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A mean field theory is presented to describe cholesteric phases in mixtures of a polymer and a cholesteric liquid crystal. Taking into account an anisotropic coupling between a polymer and a liquid crystal, we examine the helical pitch, twist elastic constant, and phase separations. Analytical expressions of the helical pitch of a cholesteric phase and the twist elastic constant are derived as a function of the orientational order parameters of a polymer and a liquid crystal and two intermolecular interaction parameters. We also find isotropic-cholesteric, cholesteric-cholesteric phase separations, and polymer-induced cholesteric phase on the temperature-concentration plane. We demonstrate that an anisotropic coupling between a polymer and a liquid crystal can stabilize a cholesteric phase in the mixtures. Our theory can also apply to mixtures of a nematic liquid crystal and a chiral dopant. We discuss the helical twisting power, which depends on temperature, concentration, and orientational order parameters. It is shown that our theory can qualitatively explain experimental observations.

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Sugar Amphiphiles as Revealing Dopants for Induced Chiral Nematic Lyotropic Liquid Crystals

Cited by 12 publications

References 14 publications

Structures of micelles formed by synthetic alkyl glycosides with unsaturated alkyl chains

Structures of micelles formed by synthetic alkyl glycosides with unsaturated alkyl chains

Phase diagrams of mixtures of a polymer and a cholesteric liquid crystal under an external field

Theory of polymer-dispersed cholesteric liquid crystals

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