1982
DOI: 10.1016/0144-2880(82)90020-3
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Electrical and optical properties of some azo dyes

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Cited by 4 publications
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“…Recent calculations show that it is the shallow potential wells which define the substrate−molecular layer interaction that allow molecules to sit on noncommensurate positions . We thought that if the asymmetric structure and dipole moment of the Sudan I molecule were important for the preferential orientation of the needle crystal parallel to the ITO surface, then the application of an electric field across the ITO/Sudan I/ITO cells should influence the orientation of the dipolar molecules in the melt, and thus, the direction of the crystal growth could be influenced in a way similar to the poling of polymers. , Indeed, when a bias of 1 V was applied between the two ITO electrodes during crystal growth, the resulting crystal was featureless and no needle structure was visible. This was confirmed using twin cells in which a narrow strip (∼2 mm) of ITO film in the middle of each electrode was etched away with sulfuric acid so that each electrode would have two physically separate parts.…”
Section: Resultsmentioning
confidence: 99%
“…Recent calculations show that it is the shallow potential wells which define the substrate−molecular layer interaction that allow molecules to sit on noncommensurate positions . We thought that if the asymmetric structure and dipole moment of the Sudan I molecule were important for the preferential orientation of the needle crystal parallel to the ITO surface, then the application of an electric field across the ITO/Sudan I/ITO cells should influence the orientation of the dipolar molecules in the melt, and thus, the direction of the crystal growth could be influenced in a way similar to the poling of polymers. , Indeed, when a bias of 1 V was applied between the two ITO electrodes during crystal growth, the resulting crystal was featureless and no needle structure was visible. This was confirmed using twin cells in which a narrow strip (∼2 mm) of ITO film in the middle of each electrode was etched away with sulfuric acid so that each electrode would have two physically separate parts.…”
Section: Resultsmentioning
confidence: 99%
“…It must be noted that, Aminoazobenzene and Dimethylaminoazobenzene dyes have good solubility in 6CHBT LC at 3% W/W composition percentage [27], but in higher percentage composition, such as 5 and 7% W/W, solubility of them decreases in LC media. So, in higher percentage composition (N 3% W/W) a quantitative analysis is impossible.…”
Section: Resultsmentioning
confidence: 98%