Pulsed laser deposition of liquid crystals

Gonzalo, J.; Dyer, P. E.; Hird, Michael

doi:10.1063/1.120124

Cited by 18 publications

(8 citation statements)

References 10 publications

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“…The UV spectrum presented in Fig. 6 shows negligible absorbance of mixtures at wavelengths higher than 340 nm, the wavelength of either the pulsed laser beam used in the liquid crystal deposition or the UV light used for curing sealant in liquid crystal devices 30 . Irradiation at 340 nm caused a decrease of the π→π* band intensity indicating the isomerization.…”

Section: Resultsmentioning

confidence: 98%

Investigation of the Phase Transition and Absorption Properties of Liquid Crystal Hexylcyanobiphenyl/Octylcyanobiphenyl Mixtures

Okumuş¹,

Özğan²

2013

Asian J. Chem.

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The hexylcyanobiphenyl (6CB) and octylcyanobiphenyl (8CB) mixtures have been investigated by means of differential scanning calorimeter and ultraviolet. Differential scanning calorimeter results indicate clearly the existence of four phase transitions in the 6CB/8CB mixtures. The phase diagram of mixture was obtained from differential scanning calorimeter and theoretical calculations. The experimental phase diagram is approximately similar to the calculated phase diagram. The phase transition temperatures of the 6CB/8CB mixtures rise with the heating rate between 2 ºC/min and 10 ºC/min. The activation energies were calculated for the phase transitions of 50 % 6CB and 50 % 8CB liquid crystal mixtures. UV experiments were carried out to characterize the absorptivity constants of liquid crystal and their mixtures. The molar absorptivity and maximum absorption wavelengths were measured in chloroform solution by UV spectrophotometry. The maximum absorption wavelength of the 6CB/8CB mixtures increases with decreasing percent weight of 8CB in 6CB, a result associated with the different lengths of the alkyl chain.

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Section: Resultsmentioning

confidence: 98%

Investigation of the Phase Transition and Absorption Properties of Liquid Crystal Hexylcyanobiphenyl/Octylcyanobiphenyl Mixtures

Okumuş¹,

Özğan²

2013

Asian J. Chem.

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“…{ 5CB shows two absorption peaks at 200 and 280 nm, respectively. 31 However, the LC film must be very thin to display a real peak without saturation of the detector. For example, in a paper published by Hird and co-workers, 31 suitable thin films of 5CB with 0.2-0.4 mm nominal thickness prepared using pulsed laser deposition show the related 280 nm absorption peak.…”

Section: Resultsmentioning

confidence: 99%

Chirality transfer in nematic liquid crystals doped with (S)-naproxen-functionalized gold nanoclusters: an induced circular dichroism study

O'Neil

Hegmann

2008

J. Mater. Chem.

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“…The UV spectra in Fig. 4 show negligible absorptivity at wavelengths above 340 nm, the wavelength of either the pulsed laser beam used in the liquid crystal deposition or the UV light used for curing sealants in liquid crystal devices [21]. Irradiation at 340 nm causes a decrease of the π→π * band intensity, an indication that the isomerization is taking place.…”

Section: Uv Spectroscopymentioning

confidence: 98%

Thermal and Spectrophotometric Analysis of Liquid Crystal 8CB/8OCB Mixtures

Özğan

Okumuş

2011

Braz J Phys

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The binary system of 4-octyl-4′-cyanobiphenyl (8CB) and 4-octyloxy-4′-cyanobiphenyl (8OCB) has been studied by means of differential scanning calorimetry (DSC) and ultraviolet absorption spectrophotometry (UV). The phase-transition temperatures, enthalpies, and entropies have been determined by using calorimetric methods on DSC. The results indicate clearly the existence of threephase regions across the crystalline-to-smectic A, smectic A-to-nematic, and nematic-to-isotropic transitions in the 8CB/8OCB mixtures. The obtained phase-transition temperatures of the 8CB/8OCB mixtures are between the data for 8CB and 8OCB. A few of the phase transitions cannot be observed at high heating rates. The phase-transition temperatures of the 8CB/8OCB mixtures rise with the heating rate between 2°C/min and 15°C/min. The activation energies were calculated by the Ozawa method for the phase transitions of 25% 8CB and 75% 8OCB liquid crystal mixtures. UV experiments were carried out to characterize the absorptivity constants of liquid crystal and their mixtures. The molar absorptivity and maximum absorption wavelengths were measured in chloroform solution by UV spectrophotometry. The maximum absorption wavelength of the 8CB/8OCB mixtures increases with decreasing percent weight of 8CB in 8OCB, a result associated with the different lengths of the alkyl chain.

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Pulsed laser deposition of liquid crystals

Cited by 18 publications

References 10 publications

Investigation of the Phase Transition and Absorption Properties of Liquid Crystal Hexylcyanobiphenyl/Octylcyanobiphenyl Mixtures

Investigation of the Phase Transition and Absorption Properties of Liquid Crystal Hexylcyanobiphenyl/Octylcyanobiphenyl Mixtures

Chirality transfer in nematic liquid crystals doped with (S)-naproxen-functionalized gold nanoclusters: an induced circular dichroism study

Thermal and Spectrophotometric Analysis of Liquid Crystal 8CB/8OCB Mixtures

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