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Preparation of thermally stable dyes derived from diketopyrrolopyrrole pigment by polymerisation with polyisocyanate binder / Chun Yoon in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 2-8 Titre : Preparation of thermally stable dyes derived from diketopyrrolopyrrole pigment by polymerisation with polyisocyanate binder Type de document : texte imprimé Auteurs : Chun Yoon, Auteur ; Hye-Sun Kwon, Auteur ; Jae-Sung Yoo, Auteur ; Hyun-young Lee, Auteur ; Ji-Hye Bae, Auteur ; Jae-Hong Choi, Auteur Année de publication : 2015 Article en page(s) : p. 2-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Solubilité Colorants -- Synthèse Pigments organiques Polyisocyanates Résines photosensibles Stabilité thermique Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Four thermally stable and solvent soluble dyes were prepared from diketopyrrolopyrrole pigment via an N-alkylation reaction. To improve the thermal stability of the dyes, a hydroxyl functional group that could react with blocked polyisocyanates was introduced into the dyes. The prepared dyes had absorption maxima near 500 nm, and the chromaticity diagrams of all synthesised dyes exhibited smaller x and y values than those of CI Pigment Red 254, indicating that the colour of the synthesised dyes was close to an orange shade. The dyes reacting with blocked polyisocyanates showed extremely high thermal stability compared with analogous dyes not reacting with polyisocyanates. Note de contenu : - EXPERIMENTAL : Materials and instrumentation - Synthesis of dyes - Preparation of a colour filter photoresist - Preparation of a colour filter photoresist without polyisocyanates - Preparation of a colour filter photoresist with polyisocyanates - Preparation of glass sheets - Solubility investigation - Measurement of spectral and chromatic properties - Thermal stability measurement - RESULTS AND DISCUSSION : Dye synthesis - Dye solubility - Characterisation of spectral properties - Chromatic properties of spin-coated colour filters - Characterisation of the thermal stability of dyes DOI : 10.1111/cote.12119 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12119 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22967 [article]

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Molecular electronic spectroscopy : from often neglected fundamental principles to limitations of state-of-the-art computational methods / Heinz Mustroph in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 9-26 Titre : Molecular electronic spectroscopy : from often neglected fundamental principles to limitations of state-of-the-art computational methods Type de document : texte imprimé Auteurs : Heinz Mustroph, Auteur ; Steffen Ernst, Auteur ; Bianca Senns, Auteur ; Andrew D. Towns, Auteur Année de publication : 2015 Article en page(s) : p. 9-26 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Calcul Colorants Logiciels Spectroscopie moléculaire Index. décimale : 667.3 Teinture et impression des tissus Résumé : The creation of the first synthetic dyes not only stimulated the hunt for new colorants but also drove the search for rules correlating the constitution of organic compounds with their colour. Dye chemistry additionally facilitated the development of molecular electronic spectroscopy as well as theories of molecular electronic structure and electronic transitions. Powerful quantum chemical computational tools are now available for the prediction of the electronic structure and spectroscopic characteristics of organic compounds. Such methods are thus useful in designing new functional colorants and aiding interpretation of their properties. However, without a deep appreciation of the principles and assumptions behind the calculations, one runs the risk of misunderstanding what can be achieved as well as becoming confused about how the outputted electronic and vibronic transition data correspond to observed absorption spectra. This review therefore aims to cover fundamentals of electronic spectroscopy that are often overlooked and enable the dye chemist using modern computational methods to comprehend the subtle differences in the types of transition energy value that such software can generate. In addition, the limitations of these methods in predicting absorption maxima and intensities of real-world colorants will be discussed in the context of physical influences on absorption band position and shape, for example from the perspective of different forms of the Franck–Condon principle. In essence, the goal of this review is to clarify, in terms that practical dye chemists will understand, what computational methods can predict and how valid these predictions are compared with reality. Note de contenu : - MOLECULAR ELECTRONIC SPECTROSCOPY : Electronic transition energy in atoms and molecules - some fundamentals - Calculation of electronic transition energies in molecules - Sources of disparity between calculated transition energies and experimental data - Intensity of electronic transitions in molecules - Absorption band shapes - the Franck-Condon principle DOI : 10.1111/cote.12120 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12120 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22968 [article]

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Effect of coloration with various metal oxides on zirconia / Jianfeng Chen in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 27-31 Titre : Effect of coloration with various metal oxides on zirconia Type de document : texte imprimé Auteurs : Jianfeng Chen, Auteur ; Yi Zhang, Auteur ; Shuwen Dong, Auteur ; Lisheng Zhao, Auteur ; Bin Gu, Auteur ; Ningfang Liao, Auteur ; Ning Wen, Auteur Année de publication : 2015 Article en page(s) : p. 27-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Céramique industrielle Colorimétrie Oxyde de bismuth Oxyde de cérium Oxyde de fer Pigments -- Synthèse Pigments inorganiques vision des couleurs Zircone Le dioxyde de zirconium ou oxyde de zirconium(IV) couramment appelée zircone est un composé inorganique du zirconium de formule ZrO2. Ce matériau est une céramique technique d'aspect opaque. Appelé CZ (Cubic Zirconia) lorsque transparent, il est utilisé pour imiter le diamant. Il ne faut pas le confondre avec le zircon (ZrSiO4). Sous sa forme tétragonale, l'oxyde de zirconium est un matériau a vocation mécanique, cette évolution cristallographique lui confère une dureté très élevée (1200Hv) ainsi qu'une bonne résistance aux sollicitations mécaniques (700Mpa en traction et 2000Mpa en compression). Une fois polie, la zircone tétragonale peut atteindre un Ra de 0,02, ce qui permet de l'utiliser pour des pièces de frottement. Index. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of this study was to evaluate the coloration of zirconia ceramic by adding three kinds of metal oxide. This was done with different concentrations of Fe2O3, CeO2, and Bi2O3 in tetragonal zirconia polycrystals stabilised with 3Y-TZP powder compacted at 200 MPa using cold isostatic pressure and full sintering. X-ray diffraction analysis was used to examine the structure of the shaded 3Y-TZP. The chromaticity of sintered bodies was measured on a spectrophotometer. The coloration of zirconia by the three kinds of metal oxide was determined. With the addition of CeO2, the lightness of the zirconia was about 84–87, a* decreased slightly, and the colour shifted to a more yellow-green hue. With an increasing content of Fe2O3, the chroma of the ceramic became more intense, the lightness decreased, and the colour changed to a red-yellow hue. With an increasing concentration of Bi2O3, the colour of the materials shifted to a light saffron yellow. X-ray diffraction spectra revealed only tetragonal phase. Results show that zirconia ceramic can be colourised using Fe2O3, CeO2, and Bi2O3. Note de contenu : - EXPERIMENTAL : Specimen preparation - Colour measurement - Characterisation of the specimens - Statistical analysis - RESULTS AND DISCUSSION : X-ray diffraction analysis - Scanning electron microscopy observation - Colour properties DOI : 10.1111/cote.12118 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12118 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22979 [article]

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A highly selective and sensitive benzothiazole-based 'turn-on' fluorescent sensor for Hg2+ ion / Serkan Erdemir in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 32-37 Titre : A highly selective and sensitive benzothiazole-based 'turn-on' fluorescent sensor for Hg2+ ion Type de document : texte imprimé Auteurs : Serkan Erdemir, Auteur ; Sait Malkondu, Auteur ; Onder Alici, Auteur Année de publication : 2015 Article en page(s) : p. 32-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Benzothiazoles Capteurs (technologie) Caractérisation Diméthylformamide Eau Fluorescence Ions mercure Ions métalliques Solutions aqueuses (chimie) Index. décimale : 667.3 Teinture et impression des tissus Résumé : A simple benzothiazole-based fluorescent probe (TDA) for the determination of Hg2+ ion in aqueous solutions was synthesised in one step and characterised by 1H NMR, 13C NMR, APT, COSY, FTIR, and elemental analysis. TDA shows a significant fluorescence change upon the interaction of Hg2+ ion in DMF–water (v/v = 1/1), while only minor changes in fluorescence intensity are observed with 18 other metal ions. Fluorescence enhancement by a factor of 15 is achieved upon selective interaction with Hg2+ ion. The Hg2+ ion detection process is found to be pH dependent; therefore, TDA could be feasible within a pH range of 4.0–7.0. Note de contenu : - EXPERIMENTAL : General - Synthesis of N-N-bis-benzothiazol-2-xy-oxalamide (TDA) - UV-vis experiments - Fluorescence experiments - H NMR experiment - RESULTS AND DISCUSSION : Synthesis - Cation-sensing properties of TDA - H NRM studies DOI : 10.1111/cote.12122 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12122 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22980 [article]

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Crystallographic study of two monoazo disperse dyes with a D–Pi–A system / Min Li in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 38-42 Titre : Crystallographic study of two monoazo disperse dyes with a D–Pi–A system Type de document : texte imprimé Auteurs : Min Li, Auteur ; Kai Zhang, Auteur ; Aiqin Hou, Auteur Année de publication : 2015 Article en page(s) : p. 38-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Synthèse Colorants azoïques Cristallographie Morphologie (matériaux) Structure cristalline (solide) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Two azo disperse dyes, 2,6-dichoro-4-nitro-4?,4?-N-cyanoethyl-N-benzyl-azobenzene (D1) and 3-(3-methyl-4-N-ethyl-N-benzyl-phenyldiazenyl)-5-nitro-2,1-benzisothiazole (D2), were synthesised and characterised. The crystal morphologies and single crystal structures were measured. The various packing and supramolecular interactions were described. D1 formed stellate crystals. The two benzene rings bilateral to the azo unit were not coplanar. Their dihedral angle was 75.72°. They were linked by the azo unit and were twisted. The coupling-component N-substituted benzyl and benzene rings were not coplanar. The chemical structure was not the typical azo structure. A dimeric packing mode was formed between adjacent molecules in a head-to-head and tail-to-tail manner. One molecule was inserted between two dimeric molecules in a head-to-tail manner. D2 formed globe crystals. The isothiazole and benzene rings of the azo unit were coplanar, with the typical ?–? conjugated structure. The benzene rings of the azo unit and the coupling-component N-substituted benzyl were vertical. Their torsion angle was 179.9°. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of the disperse dyes - Measurements - RESULTS AND DISCUSSION : Crystal morphologies of the disperse dyes - Structure of D1 - Structure of D2 DOI : 10.1111/cote.12121 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12121 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22981 [article]

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Combining dyeing and wrinkle-resistance finishing of cotton in a one-step process using a hemicyanine fluorescent dye / Zhang Wei in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 43-47 Titre : Combining dyeing and wrinkle-resistance finishing of cotton in a one-step process using a hemicyanine fluorescent dye Type de document : texte imprimé Auteurs : Zhang Wei, Auteur ; Yan Zhang, Auteur ; Chuanxiang Qin, Auteur ; Guoqiang Chen, Auteur Année de publication : 2015 Article en page(s) : p. 43-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Diméthylformamide Essais (technologie) Extraction (chimie) Fixation (chimie) Fluorescence Hemicyanine Résistance au froissement Solidité de la couleur Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Combining dyeing and wrinkle-resistance finishing of cotton in a one-step process using a hemicyanine fluorescent dye DHEASPBr-C2 was investigated in this paper. Fourier transform infrared spectroscopy, a fixation test, extraction with boiling N,N-dimethylformamide, and a colour fastness test certified that DHEASPBr-C2 was linked to the cotton fibre through covalent bonds. The results showed that dyed cotton fabric using DHEASPBr-C2 had an obvious fluorescent effect in the range 550–700 nm, and the emission peak location was 588–590 nm. In addition, the dyed fabric met the EN471:2003 standard for chromaticity and could be used in high-visibility warning clothing. Note de contenu : - EXPERIMENTAL : Materials - Dyeing methods - Measurements - RESULTS AND DISCUSSION : Investigation of the dyeing process - Fluorescence characteristics of the dyed cotton fabrics - Wrinkle resistance effect of the dyed cotton fabrics DOI : 10.1111/cote.12126 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12126 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22982 [article]

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Artificial neural networks for colour prediction in leather dyeing on the basis of a tristimulus system / Malathy Jawahar in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 48-57 Titre : Artificial neural networks for colour prediction in leather dyeing on the basis of a tristimulus system Type de document : texte imprimé Auteurs : Malathy Jawahar, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Mehta Kondamudi Manobhai, Auteur Année de publication : 2015 Article en page(s) : p. 48-57 Langues : Anglais (eng) Catégories : Couleur Couleur -- Analyse Echantillonnage Essais (technologie) Prévision, Théorie de la Qualité -- Contrôle Réseaux neuronaux (informatique) Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Computer-assisted colour prediction and quality control have become increasingly important to the dyeing process in many consumer goods manufacturing industries, including textile and leather. The most challenging aspect concerns dye recipe prediction for the production of the required shade on a given substrate. Computer recipe prediction based on the conventional and widely used Kubelka–Munk model often fails under a variety of conditions. In the present investigation, an attempt has been made to develop an artificial neural network model to predict colour in terms of tristimulus values (X, Y, Z) given the concentration of dyes. An artificial neural network model was trained with 300 pairs of known input vectors, i.e. dye concentrations, and output vectors, i.e. colour parameters, using a backpropagation algorithm. The artificial neural network topology consists of three neurons in the input layer to represent the concentration of dyes, three neurons in the output layer to represent the tristimulus values X, Y, and Z, and five neurons in the hidden layer with a log-sigmoid transfer function. The artificial neural network results showed a good level of colour prediction during the training and testing phase. The results also indicate that the artificial neural network has the potential to give better predictive performance than the conventional Kubelka–Munk model. Note de contenu : - INTRODUCTION : Conventional colour prediction model (the Kubelka-Munk model) - Neural network and colour prediction - EXPERIMENTAL : Materials - Leather sample preparation - Colour analysis - Database generation for the Kubelka-Munk model - Artificial neural network design - RESULTS AND DISCUSSION : Conventional colour prediction using the Kubelka-Munk model - ANN design optimisation - Artificial neural network training - Validation of the Kubelka-Munk and artificial neural network models DOI : 10.1111/cote.12123 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12123 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22983 [article]

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A new image-based unlevelness index in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 58-65 Titre : A new image-based unlevelness index Type de document : texte imprimé Année de publication : 2015 Article en page(s) : p. 58-65 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Couleur -- Analyse Etudes comparatives Fourier, Spectroscopie infrarouge à transformée de Jeans Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : A new quantitative unlevelness index based on the Fourier transformation frequency component is introduced for evaluation of the degree of unlevelness of a set of dyed fabrics with different surface colour uniformities. A series of dyed denims with different degrees of unlevelness were prepared, and the degree of uneven appearance of fabrics was ranked by a group of observers. The surfaces of fabrics were imaged by a conventional scanner, and the Fourier transform was employed to compute the spectrum of desired images. It was found that the low-frequency components of the computed matrix were stronger than the others, while its DC component, which related to the mean of the desired image, was too large. By this method, it was demonstrated that the fraction of the sum of the maximum of the second to sixth columns of the Fourier components of the captured image to the maximum of the first column component varied with the degree of unlevelness of the desired surfaces. The performance of the method was compared with five spectral and image based instrumental levelness–unlevelness indices, as well as those reported by visual ranking. Based on the results, the Fourier transformation method and the singular value decomposition technique show the best agreement with visual evaluation results, but the singular value decomposition method requires a longer computation time. Note de contenu : - REVIEW OF QUANTITATIVE UNLEVELNESS INDICES : Spectral-based indices - Image-based indices - FOURIER TRANSFORM IN EVALUATION OF UNLEVELNESS - EXPERIMENTAL DOI : 10.1111/cote.12124 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12124 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22984 [article]

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Low-temperature bleaching of cotton fabric using a copper-based catalyst for hydrogen peroxide / Chong Yin in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 66-71 Titre : Low-temperature bleaching of cotton fabric using a copper-based catalyst for hydrogen peroxide Type de document : texte imprimé Auteurs : Chong Yin, Auteur ; Yuting Huang, Auteur ; Linping Zhang, Auteur ; Hong Xu, Auteur ; Yi Zhong, Auteur ; Zhiping Mao, Auteur Année de publication : 2015 Article en page(s) : p. 66-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de blanchiment Basses températures Catalyseurs au cuivre Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Index. décimale : 667.3 Teinture et impression des tissus Résumé : Hydrogen peroxide can be catalysed to bleach cotton fibres at a temperature of 70 °C by incorporating the copper-based catalyst [Cu(TPMA)Cl]ClO4·1/2H2O in the bleaching solution. The effects of pH, temperature, and concentration of catalyst and hydrogen peroxide on bleaching effectiveness were evaluated. The effects of other transition metal complexes of tris(2-pyridylmethyl)amine were also examined. The bleaching mechanism was investigated by studying the active species. The results showed that a satisfactory whiteness index could be obtained at low temperature with the copper-based catalyst, and it also had a competitive advantage in protecting cellulose from severe chemical damage. Cu(i)TPMA(OOH)? was the active species in bleaching. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of [Cu(TPMA)Cl]Clo4.1/2H2O - Bleaching of fabrics - Mechanism analysis - Tests and measurements - RESULTS AND DISCUSSION : Effect of [Cu(TPMA)Cl]Clo4.1/2H2O concentration - Effect of the hydrogen peroxide concentration - Effect of pH - Effect of temperature - Effect of other transition metal complexes of tris(2-pyridylmethyl)amine - Copper-based catalyst residue - Comparison of the copper-based catalysis bleaching system with the traditional process - Mechanism discussion DOI : 10.1111/cote.12125 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12125 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22985 [article]

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