Molecular aggregation in Langmuir–Blodgett films of azo dye/liquid crystal mixtures

Inglot, Krzysztof; Kaleta, Agnieszka; Martyński, Tomasz; Bauman, Danuta

doi:10.1016/j.dyepig.2007.05.016

Cited by 22 publications

(16 citation statements)

References 17 publications

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“…Further, this leads to the conclu− sion that at the transfer of the monolayer from the water sur− face to the quartz plate, a rearrangement of the molecular or− ganization takes place. Such effect was previously observed for other compounds [2,4,15,[18][19][20]. …”

Section: Electronic Absorption Spectra Of Langmuir and Langmuir-blodgsupporting

confidence: 61%

“…The creation of the circular domains is also seen (2-4), but they do not pack together, solely their brightness increases. This effect can be connected with the immiscibility of both components in the Langmuir film, which was found in our previous study of 3/8CB mixtures of various compositions [4]. For 3/8PCH mixtures also the phase separation was observed and it was reflected in BAM images too (data not shown).…”

Section: Bam Images Of Langmuir Filmsmentioning

confidence: 73%

“…The detailed analysis of absorption spec− tra of the azo dye/liquid crystal mixtures in LB films was made previously and its results are presented in Ref. 4. It was found that the mutual orientation of molecules in the aggre− gate as well as the amount of the appropriate kind of aggre− gates at given MF strongly depend on the molecular structure of the dye, and first of all on the value and direction of the re− sultant dipole moment.…”

Section: Electronic Absorption Spectra Of Langmuir and Langmuir-blodgmentioning

confidence: 99%

“…Figure 7 presents the representative long−wavelength absorption spectra of Langmuir film of dye 1 mixed with 8CB at MF = 0.3. The spectra were recorded before compression process (1) and next at various surface pressure (2)(3)(4). It is seen that there is no significant change in the shape and the peak posi− tion as the surface pressure is increased.…”

Section: Electronic Absorption Spectra Of Langmuir and Langmuir-blodgmentioning

confidence: 99%

“…In par− ticular, they display intriguing optical properties and there− fore can find application as novel functional materials for molecular electronics and photonics. Well known groups of dyes, which molecules have tendency to aggregation al− ready in the ground electronic state, are azo dyes [1][2][3][4]. These dyes are characterized by high value of hyperpolari− zability and, incorporated into highly oriented matrices, can find application in nonlinear optics [5].…”

Section: Introductionmentioning

confidence: 99%

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Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

Inglot

Martyński

Bauman

2009

Opto-Electronics Review

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A study of azo dye/liquid crystal mixtures in monolayers formed at air-water (Langmuir films) and air-solid substrate (Langmuir-Blodgett films) interfaces was performed. Three azo dyes with various molecular structure and two liquid crystal materials: 4-octyl-4′-cyanobiphenyl (8CB) and trans-4-octyl(4′-cyanophenyl)-cyclohexane (8PCH) were used. The morphology of Langmuir films was monitored by means of a Brewster angle microscope (BAM). Moreover, a surface pressure and electronic absorption spectra of the monolayer spread on the water surface of dye/liquid crystal mixtures as a function of a mean molecular area were simultaneously recorded. In addition, the absorption for Langmuir-Blodgett films deposited on quartz plates was measured. Information about intermolecular interactions in the mixtures of the nonamphiphilic dye and the liquid crystal with polar terminal group was obtained. Conclusions about the formation of self-aggregates between dye molecules have been drawn. The influence of the dye molecular structure and its concentration on aggregates’ geometry was found.

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Section: Electronic Absorption Spectra Of Langmuir and Langmuir-blodgsupporting

confidence: 61%

Section: Bam Images Of Langmuir Filmsmentioning

confidence: 73%

Section: Electronic Absorption Spectra Of Langmuir and Langmuir-blodgmentioning

confidence: 99%

Section: Electronic Absorption Spectra Of Langmuir and Langmuir-blodgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

Inglot

Martyński

Bauman

2009

Opto-Electronics Review

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Optical properties of chiral nematic side‐chain copolymers bearing cholesteryl and azobenzene building blocks

Liu

Chou

Balamurugan

et al. 2010

J. Polym. Sci. A Polym. Chem.

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Thermotropic chiral nematic (N*) side‐chain copolymers (CPs) bearing cholesteryl and azobenzene units were synthesized to investigate the structure–property relationships of the acrylates of the chiral, achiral, and photochromic monomers of free radical polymerization‐derived polymers. The polar effect of chlorine substitution on the benzene ring of the chiral monomer (M3*) widened the mesophase transition temperature only at the monomer level, but no remarkable effect on the mesomorphic, optical or thermochromism of the corresponding CPs was observed. An examination of the CPs prepared using differential scanning calorimetry and hot‐stage polarizing microscopy showed that all the CPs exhibited a cholesteric nematic phase (N*), and increasing the content of the cholesteryl units in the CPs displayed only the N* phase over a much wider temperature range. On cooling from the isotropic melt of N* CPs, selective reflections of visible light that changed from short to long wavelengths were observed. The photolysis of CPs revealed that CP1–CP4 undergo reversible photoisomerization and that CP5 and CP6 undergo irreversible photoisomerization. The rate of isomerization depends on the type (NN, CHCH, and both) and content of photochromic units in the CPs. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

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Thermo-Optic and Dispersion Properties of Host–Guest Doping Polymer

Qiu

Cao

et al. 2012

Arab J Sci Eng

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Molecular aggregation in Langmuir–Blodgett films of azo dye/liquid crystal mixtures

Cited by 22 publications

References 17 publications

Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

Optical properties of chiral nematic side‐chain copolymers bearing cholesteryl and azobenzene building blocks

Thermo-Optic and Dispersion Properties of Host–Guest Doping Polymer

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