Heteroaromatic Azo Dyes Exhibiting Negative Dichroism in Liquid Crystals

Иващенко, А. В.; Petrova, O. S.; Титов, В. В.

doi:10.1080/00268948408072097

Cited by 23 publications

(5 citation statements)

References 11 publications

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“…This model is valuable in terms of rationalising observed order parameters, for example, enabling the negative dichroism of some azo and anthraquinone dyes to be rationalised and providing estimates for values of β. [70][71][72] …”

Section: Dye Alignment Models and Theoretical Approachesmentioning

confidence: 98%

Dyes as guests in ordered systems: current understanding and future directions

Sims

2016

Liquid Crystals

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The optical properties of dyes dissolved in liquid crystals have led to their proposed use in a diverse range of practical applications. Such guest-host systems are typically required to fulfil a range of criteria relating to their absorption properties, degree of alignment and stability, but concurrently satisfying these requirements has proven a barrier to their widespread use. In this article, many of the proposed applications and their requirements are discussed, and an outline of some of the most prevalent classes of dye proposed in the context of guest-host systems is given, along with a summary of recent reports of dyes that exhibit thermotropic mesophases. Theoretical approaches to describing the alignment within guest-host systems are outlined, and possible strategies for the future rational design of guest-host systems are discussed. ARTICLE HISTORY

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Section: Dye Alignment Models and Theoretical Approachesmentioning

confidence: 98%

Dyes as guests in ordered systems: current understanding and future directions

Sims

2016

Liquid Crystals

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“…Experimentally, the order parameter of the dichroic dye, SG can be estimated from the spectrophotometric data by applying the following equation [20,21]:…”

Section: Order Parameter Of Dye In Liquid Crystal Matrixmentioning

confidence: 99%

Guest Effect on Nematic-Isotropic Phase Transition Temperature of Liquid Crystal 6CHBT

1997

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The polarized absorption spectra of seven dichroic azo dyes dissolved in the nematogenic liquid crystal host 6CHBT have been recorded as a function of temperature. On the basis of these spectra, the guest order parameter has been determined. Moreover, the influence of the dye addition on the behaviour of the guest-host mixture in the vicinity of the nematic-isotropic phase transition has been examined. The experimental results have been compared in some details with the calculations done on the basis of the mean field theory for binary mixtures.

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“…The second-rank order parameter (Ρ2) can also be evaluated from the polarized absorption spectra of the dye dissolved in the anisotropic matrix using the following formula [35][36][37]:…”

Section: Theorymentioning

confidence: 99%

Orientational Behaviour of the Guest-Host Systems in the Smectic A and Nematic Phases

1992

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The measurements of the polarized absorption and fluorescence components spectra for the guest-host mixtures have been used to study the long orientational order in the uniaxial phases of the liquid crystal. The temperature dependence of the order parameters, (Ρ2) and (Ρ 4 ), has been investigated and the molecular distribution function has been determined. On the basis of the (Ρ2) and (Ρ4), values some conclusions about the molecular orientation in the smectic A and nematic phases of the liquid crystalline samples have been drawn. It has been also found that the fluorescence spectroscopy is a sensitive method for determination of the phase transition temperatures of the liquid crystal doped with the fluorescent dye.

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Heteroaromatic Azo Dyes Exhibiting Negative Dichroism in Liquid Crystals

Cited by 23 publications

References 11 publications

Dyes as guests in ordered systems: current understanding and future directions

Dyes as guests in ordered systems: current understanding and future directions

Guest Effect on Nematic-Isotropic Phase Transition Temperature of Liquid Crystal 6CHBT

Orientational Behaviour of the Guest-Host Systems in the Smectic A and Nematic Phases

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