The effect of dye structure on the dyeing and optical properties of dichroic dyes for PVA polarizing film

Chang, Jae Bok; Hwang, Jong Hak; Park, Jong Soo; Kim, Jae Pil

doi:10.1016/j.dyepig.2010.08.007

Cited by 24 publications

(12 citation statements)

References 19 publications

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“…3. Such aspect ratios are used extensively in the literature to consider the molecular alignment of both liquid crystalline molecules [38][39][40][41][42][43] and guest molecules 14,[44][45][46] within anisotropic systems, and they have also been reported to correlate with trends in experimental dichroic order parameters for some guest dyes. 16,19,20,28 We found that the aspect ratios of the five dyes gave a trend, shown graphically in Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental and molecular dynamics studies of anthraquinone dyes in a nematic liquid-crystal host: a rationale for observed alignment trends

Sims

Abbott

Cowling

et al. 2016

Phys. Chem. Chem. Phys.

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Five anthraquinone dyes with bis(4-propylphenyl) substituents, connected via sulfide or amine linking groups at the 1,5-positions or directly at the 2,6-positions, have been studied as guests in the nematic liquid crystal host, E7. Polarized UV-visible absorption spectra of aligned samples were used to obtain experimental dichroic order parameters, which exhibit values in the range 0.51-0.74. Fully atomistic MD simulations of these guest-host systems were carried out, generally using default parameters but using new force constants derived here for the dyes containing flexible phenyl-sulfide and phenyl-amine linking groups. An analysis of the alignment of the dye molecules in these simulations provides calculated molecular order parameters, which are combined with calculated order parameters for the alignment of the transition dipole moments within the dyes, reported previously, to give calculated dichroic order parameters. The trend in the calculated dichroic order parameters between the dyes shows a good match with the trend in the experimental values, enabling the observed variation to be rationalised primarily by changes in the alignment of the calculated transition dipole moments within the dyes; the calculated molecular order parameters show a relatively small variation between the dyes. The results indicate that this computational approach may be used generally to rationalise trends in the alignment of guest molecules in liquid crystal hosts, suggesting that it may also be able to provide a predictive aid in the design of guest dyes.

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Section: Introductionmentioning

confidence: 99%

Experimental and molecular dynamics studies of anthraquinone dyes in a nematic liquid-crystal host: a rationale for observed alignment trends

Sims

Abbott

Cowling

et al. 2016

Phys. Chem. Chem. Phys.

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“…This is a distinguishing characteristic of guest-host coatable polarizers as opposed to the PVA-based polarizing films, in which there is an optimum dye concentration to maximize the dichroic ratio [28].…”

Section: Characteristics Of Guest-host Coatable Polarizersmentioning

confidence: 99%

“…Long and linear conjugated systems lead to an increase in the dichroic ratio, owing to intrinsic and extrinsic factors related to the dye molecules[28]. The magnitude and anisotropy of the transition dipole moment (intrinsic factor) should be improved by charge transfer along the long and linear conjugated system.…”

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confidence: 99%

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Effect of dye structure on orientational behavior and transition dipole moments in coatable guest–host polarizers

et al. 2015

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“…The global production of PVA is almost over 650,000 tons/year. It is also used for polarizing film light in liquid crystal displays (LCDs) [2]. However, discharging of a large quantity of PVA influences both human health and natural environment [3] and leads to high chemical oxygen demand (COD) in the industrial effluents.…”

Section: Introductionmentioning

confidence: 99%

Removal of Polyvinyl Alcohol in Aqueous Solutions Using an Innovative Paired Photoelectrochemical Oxidative System in a Divided Electrochemical Cell

Huang¹,

Wang

Chou

et al. 2015

International Journal of Photoenergy

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This study evaluates the performance of an innovative paired photoelectrochemical oxidative system fabricated in our laboratory to determine the removal efficiency of polyvinyl alcohol (PVA) in aqueous solutions. An innovative paired photoelectrochemical oxidative system employed metal redox mediators with high redox potential for anodic oxidation (MEO process) and UV assisted photoelectrochemical oxidation (PEO process) for cathodic oxidation in a divided electrochemical cell. Several parameters were investigated to characterize the removal efficiency of PVA, such as the current density, initial Ce(III) concentration, nitric acid concentration, oxygen flow rate, and UV irradiation intensity. The effects of these parameters on the specific energy consumption were also investigated. Additionally, the conversion yield of Ce(IV) concentration and the electrogeneration of H2O2were calculated in this study. The optimum current density, initial Ce(III) concentration, nitric acid concentration, oxygen flow rate, and UV irradiation intensity were found to be 3 mA cm−2, 0.01 M, 0.3 M, 500 cm3 min−1, and 1.2 mW cm−2, respectively. The synergistic effect of combination process of MEO and PEO would be as a promising alternative for the removal efficiency of PVA.

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The effect of dye structure on the dyeing and optical properties of dichroic dyes for PVA polarizing film

Cited by 24 publications

References 19 publications

Experimental and molecular dynamics studies of anthraquinone dyes in a nematic liquid-crystal host: a rationale for observed alignment trends

Experimental and molecular dynamics studies of anthraquinone dyes in a nematic liquid-crystal host: a rationale for observed alignment trends

Effect of dye structure on orientational behavior and transition dipole moments in coatable guest–host polarizers

Removal of Polyvinyl Alcohol in Aqueous Solutions Using an Innovative Paired Photoelectrochemical Oxidative System in a Divided Electrochemical Cell

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