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Showing 1 to 20 of 631 for “"dyes"”.
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Contact Allergy to Textile Dyes - Clinical and Chemical Studies on Disperse Dyes
Disperse dyes are common sensitizers among textile dyes. Contact allergy to disperse dyes has been documented in studies carried out in southern Europe, however, corresponding studies have not been performed in the Scandinavian countries. The aim of this study was thus to evaluate the prevalence of …
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Contact allergy to textile dyes. Clinical and experimental studies on disperse azo dyes
Disperse dyes are the most common allergens among textile dyes. It is not known whether the purified dyes, impurities in the commercial dyes, or metabolites are the actual sensitisers. Moreover, it is not known whether those disperse dyes that are now present in test series are actually used in …
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Novel near-infrared absorbing dyes
… 4-nitrobenzenediazonium chloride to give monoazo dyes. The λmax values of these gave a qualitative indication of relative electron donor strengths, and the 1-ethyl-2-methylperimidine azo dyes proved to be the most bathochromic, being blue in colour. The dyes were amongst the most bathochromic …
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Halogen derivatives of certain azo dyes
Project (B.S.)--University of Kansas, Chemistry, 1917. ; Includes bibliographic references.
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The chemistry of some triphenylmethane dyes
A comprehensive series of Pyrrole Green dyes containing substituents in the 2-, 3- and 4-positions of the phenyl ring have been synthesised from the relevant carbinols. The steric and electronic effects of the substituents on the visible absorption spectra of the dyes have been examined and linear …
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Reactions of Excited State Cationic Dyes
Our goal was to study very fast electron transfer and other reactions of excited state of organic dye molecules. Therefore, a transient spectrometer with a time resolution of 36 ps was designed and built; this is described in chapter 2. In the third chapter, intersystem crossing in a cyanine dye, …
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Fate of azo dyes in sludges
… and anaerobic conditions. The potential of the dyes to leach from landfills was also investigated using Toxicity Characteristic Leaching Procedure (TCLP) analysis. The vinyl sulfone group of the Reactive Black 5 dye appeared to enable the dye to sorb to biomass better than the hydrolyzed form of …
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Spectroscopy, Electrochemistry and Photochemistry of Phenylazonaphthalene Dyes
… 2-(4-R-phenylazo)naphthalene-4,8-disulfonate dyes (R-Span dyes), were studied to report on their structure and reactivity in water. The dyes differ in their structure by only the R substituent attached to the phenyl ring, representing a range of electron-donating and electron-withdrawing …
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Alkyl, alkenyl and cycloalkyl substituted triphenylmethane dyes
… be determined and by comparison with the parent dyes and the corresponding methyl analogues, the agreement of the spectral parameters of the ineta- isopropyl derivatives with theoretical considerations is examined.
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The chemistry of some basic triphenylmethane dyes
… groups on some properties of triphenylmethane dyes has been investigated. Two series of dyes have been synthesised: compounds with two identical terminal groups, analogues of Malachite Green, and those with three terminal groups, the Crystal Violet series. N,N-dimethylamino--, …
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Molecular distillation characteristics of several anthraquinone dyes
… characteristics of several anthraquinone dyes by the determination of single and composite elimination curves, and to attempt to separate binary mixtures of dyes by various redistillation techniques. The glass centrifugal molecular still with a five-inch rotor and a ball-jar condensing …
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Mesomorphic Dyes based on Conformationally Flexible 1,3,5-Triazines
… focuses on the development of mesomorphic dyes based on 1,3,5-triazines. The thesis begins with structures possessing a more conventional liquid crystal design (e.g. symmetric disk-shaped molecules with six or more side- chains) and progresses towards the synthesis of liquid crystals with …
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