Molecular organization in binary mixtures of derivatives of naphthalenebicarboxylic acid and naphthoylenebenzimidazole with a liquid crystal in two-dimensional layers

Biadasz, Andrzej; Martyński, Tomasz; Stolarski, Ryszard; Bauman, Danuta

doi:10.1080/02678290412331315986

Cited by 15 publications

(12 citation statements)

References 39 publications

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“…5, it follows that the absorbance values of the dye at the same MF are different in Langmuir and LB films. This observation seems to confirm the fact, found previously for derivatives of naphthalenebicarboxylic acid and of naphthoylenebenzimidazole as well as for their mixtures with liquid crystals [14] that at the transfer of the monolayer from the water surface to the quartz plate, a rearrangement of the molecular organization takes place. The angle between the long Table 5 The position of the fluorescence maximum (l) and the half-bandwidth of the fluorescence band (d) for 1e4, pure and mixed with AA and 8CB in LB films…”

Section: Electronic Absorption Spectrasupporting

confidence: 89%

Spectral properties of some fluorescent dyes in two-dimensional films formed by means of Langmuir–Blodgett technique

et al. 2007

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Section: Electronic Absorption Spectrasupporting

confidence: 89%

Spectral properties of some fluorescent dyes in two-dimensional films formed by means of Langmuir–Blodgett technique

et al. 2007

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“…The tilt angle ϕ for 8CB was estimated as the angle between the long axis of the rigid core of liquid crystal molecules and the normal to the water surface just before the collapse point. It is in agreement with the data given in literature [12][13][14]. From the course of the π-A isotherms for the dye/8CB mixtures it follows that the rise of π begins at smaller and smaller values as X M of the dye increases.…”

Section: Surface Pressure and Surface Potential As A Function Of Meansupporting

confidence: 81%

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

2009

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A study of azo dye/liquid crystal mixtures in monolayers formed at an air-water interface (the Langmuir films) and at a solid surface (the Langmuir-Blodgett films) has been performed. Five azo dyes with various molecular structure and the liquid crystal 4-octyl-4 -cyanobiphenyl (8CB) have been used. The dyes have been added to the liquid crystal at various molar fractions. Surface pressure and surface potential versus mean molecular area isotherms for the Langmuir films have been recorded and information about intermolecular interactions at the air-water interface has been obtained. On the basis of electronic absorption measurements for the Langmuir and Langmuir-Blodgett films the conclusions about the ability of dyes molecules to form self-aggregates at the interfaces have been drawn. The influence of the dye molecular structure and its concentration on aggregates' geometry has been found.

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“…As a result of such interactions the molecules are not densely packed, and consequently the 8CB monolayer is fragile. It was found that the average angle between the molecular long axes of 8CB and the normal to the water surface is about 60u [2,12]. Thus, the alignment of the molecules in the first layer resembles a slice of the smectic C (SmC) phase rather than the SmA phase.…”

Section: Surface Pressure -Mean Molecular Area Isothermsmentioning

confidence: 97%

Influence of the alkyl chain length of some mesogenic molecules on their Langmuir film formation ability

Inglot¹,

Martyński²,

Bauman³

2006

Liquid Crystals

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Langmuir films of members of two homologous series, the 4-n-alkyl-49-cyanobiphenyls (nCB) for n52-14 and trans-4-n-alkyl(49-cyanophenyl)cyclohexanes (PCHn) for n52-12, have been studied by recording surface pressure/area isotherms and by Brewster angle microscopy. It has been found that the compounds with very short chains (n(3) and very long chains (n.12 for nCB, n.10 for PCHn) are unable to form compressible monolayers at the air-water interface. Other members of both series can form stable Langmuir films, but both their rigidity and stability as well as the molecular packing vary with the alkyl chain length. The isotherms and BAM images imply that the organization of the liquid crystal molecules in the films is to some extent correlated with their ability to form corresponding mesophase in the bulk: nematogenic compounds tend to form rounded droplet-like domains, whereas smectogenic compounds tend to form flat domains.

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Molecular organization in binary mixtures of derivatives of naphthalenebicarboxylic acid and naphthoylenebenzimidazole with a liquid crystal in two-dimensional layers

Cited by 15 publications

References 39 publications

Spectral properties of some fluorescent dyes in two-dimensional films formed by means of Langmuir–Blodgett technique

Spectral properties of some fluorescent dyes in two-dimensional films formed by means of Langmuir–Blodgett technique

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

Influence of the alkyl chain length of some mesogenic molecules on their Langmuir film formation ability

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