Accueil
COLORATION TECHNOLOGY / Society of dyers and colourists . Vol. 130, N° 5Mention de date : 10/2014Paru le : 26/09/2014 |
Dépouillements
Ajouter le résultat dans votre panierXanthoproteic reaction for the evaluation of wool antifelting treatments / Gianluca Migliavacca in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Xanthoproteic reaction for the evaluation of wool antifelting treatments Type de document : texte imprimé Auteurs : Gianluca Migliavacca, Auteur ; Franco Ferrero, Auteur ; Claudio Tonin, Auteur Année de publication : 2014 Article en page(s) : p. 319-326 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides aminés Les acides aminés (ou aminoacides) sont une classe de composés chimiques possédant deux groupes fonctionnels : à la fois un groupe carboxyle –COOH et un groupe amine –NH2. Parmi ceux-ci, les acides α-aminés se définissent par le fait que leur groupe amine est lié à l'atome de carbone adjacent au groupe acide carboxylique (le carbone α), ce qui leur confère la structure générique H2N–CHR–COOH, où R représente la chaîne latérale, qui identifie l'acide α-aminé.
Les acides α-aminés jouent un rôle fondamental en biochimie comme constituants élémentaires des protéines : ils polymérisent en formant des liaisons peptidiques qui aboutissent à de longues chaînes macromoléculaires appelées peptides.
Anti-feutrage
Chimie textile
Colorimétrie
Fourier, Spectroscopie infrarouge à transformée de
Laine
Microscopie électronique à balayage
Réaction xanthoprotéiqueUne réaction xanthoprotéique est une réaction chimique permettant de mettre en évidence certains acides aminés (avec noyau aromatique).
TryptophaneLe tryptophane est un acide aminé, qui dans sa configuration L (L-tryptophane, ne pas confondre avec lévogyre) est l'un des 22 acides aminés constituant des protéines. Dans le code génétique, il est codé par le codon UGG. Il s'agit d'un acide aminé essentiel pour l'humain, c'est-à -dire qu'il doit être apporté par l'alimentation.
Propriétés : Il est aromatique, apolaire et hydrophobe (comme la phénylalanine). Très fragile, il est détruit par les acides minéraux, et ne peut être isolé dans les hydrolysats acides des protéines. C'est un acide aminé contenant un hétérocycle indole qui lui confère de propriétés spectroscopiques d'absorption et de fluorescence dans l'UV. En dehors de son utilisation dans la biosynthèse des protéines, c'est le précurseur d'autres composés importants comme la sérotonine, la mélatonine, la bufoténine, etc.
TyrosineLa tyrosine (en abrégé, Tyr ou Y) est l'un des 20 acides aminés participant à la synthèse des protéines. Elle est codée par les codons UAC et UAU dans l'ARN messager. C'est un acide aminé aromatique, polaire du fait de la présence du groupement hydroxyl phénolique qui est faiblement acide.Index. décimale : 667.3 Teinture et impression des tissus Résumé : The substances responsible for the yellowing of wool treated with nitric acid are two amino acid constituents of the fibre: tryptophan and tyrosine. Nitric acid penetrates the fibres and carries out electrophilic aromatic substitution on the two above-mentioned amino acid residues, producing different colour yields. The intensity of yellowing depends in various ways on the treatment conditions (time, temperature, nitric acid concentration, agitation, and liquor ratio). Yellowing evaluation shows abnormal yellowing depending on acid concentration in the range 5.6–5.9 m. Working in this region makes it possible to use the chromatic reaction in order to show the damage done to wool fibres by the oxidising agents utilised in normal antifelting treatments. Wool damage by the oxidants is usually evaluated by dyeing methods based on different affinity of damaged fibres. By contrast, the xanthoproteic reaction yields chromogens as a function of the accessibility of tryptophan and tyrosine residues for the action of nitric acid on damaged fibres, and can be used for assessing the degree of antifelting treatment and its possible unevenness through the development on the treated wool of a yellow coloration more intense than on untreated wool. Note de contenu : - EXPERIMENTAL : 1. Materials - 2. Wool treatment with nitric acid - 3. Colour measurements - 4. Amino acid analysis - 5. Tryptophan analysis - 6. Tyrosine analysis - 7. Fourier Transform-infrared-attenuated total reflectance and scanning electron microscopy - 8. Staining tests
- RESULTS AND DISCUSSION : 1. Wool treatment with nitric acid - 2. Amino acid analysis - 3. Tryptophan and tyrosine spectrophotometric analysis - 4. Fourier Transform-infrared-attenuated total reflectance analysis - 5. Scanning electron microscopy - 6. Application of xanthoproteic reaction to antifelting treated woolDOI : 10.1111/cote.12108 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12108 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22069
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 319-326[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible Differential dyeing of wool fabric with metal-complex dyes after ultraviolet irradiation / Gianluca Migliavacca in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Differential dyeing of wool fabric with metal-complex dyes after ultraviolet irradiation Type de document : texte imprimé Auteurs : Gianluca Migliavacca, Auteur ; Franco Ferrero, Auteur ; Monica Periolatto, Auteur Année de publication : 2014 Article en page(s) : p. 327-333 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Absorption
Complexes métalliques
Essais dynamiques
Hydrophilie
Laine
Rayonnement ultraviolet
Solidité de la couleur
Teinture -- Fibres textiles
Traitement par irradiation
Traîtements de surfaceIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Experiments were conducted to investigate the ultraviolet irradiation of wool fabric as a pretreatment for differential dyeing. Wool fabric was irradiated using a medium-pressure mercury lamp in order to obtain, on the irradiated area, increased dye uptake under the same dyeing conditions as untreated wool. The chemical modification of the fibre surface as a result of ultraviolet irradiation was confirmed by an increase in metal ion absorption and hydrophilicity, in agreement with Fourier Transform-infrared–attenuated total reflectance spectra, although scanning electron microscopy showed that the fibre morphology was unaffected. A selection of 1:1 metal-complex dyes was used to show the maximum colour difference between irradiated and untreated areas of the fabric. The experiments focused on two effects: a double face with the same shade but different depths (greater depth on the treated side), and a double face with different shades. The latter effect was achieved by dyeing the irradiated fabrics with mixtures of acid and metal-complex dyes. Rubbing and washing fastness evaluations at 50 °C confirmed that the dyeings after irradiation with the selected 1:1 metal-complex dyes scored identically to conventional dyeings. Note de contenu : - MATERIALS AND METHODS : 1. Fabric irradiation and characterisation - 2. Dyeing - 3. Colour and fastness evaluation
- RESULTS AND DISCUSSION : 1. Fabric characterisation - 2. Dyeing - 3. Dyeing fastnessDOI : 10.1111/cote.12107 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12107 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22070
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 327-333[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible Alkali dissolution behaviour of sea–island-type polyethylene terephthalate ultramicrofibre knitted fabrics / Hyun Sung Kim in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Alkali dissolution behaviour of sea–island-type polyethylene terephthalate ultramicrofibre knitted fabrics Type de document : texte imprimé Auteurs : Hyun Sung Kim, Auteur ; Eun Suk Shin, Auteur ; Jung Jin Lee, Auteur Année de publication : 2014 Article en page(s) : p. 334-339 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Calorimétrie
Colorants cationiques
Dissolution (chimie)
Fibres textiles synthétiques
Hydroxyde de sodiumL'hydroxyde de sodium, appelé également soude caustique7, est un corps chimique composé minéral de formule chimique NaOH, qui est à température ambiante un solide ionique. Fusible vers 318 °C, il se présente généralement sous forme de pastilles, de paillettes ou de billes blanches ou d'aspect translucide, corrosives et très hygroscopiques. Il est très soluble dans l'eau et légèrement soluble dans l'éthanol.
La solution d'hydroxyde de sodium, souvent appelée soude, est une solution aqueuse transparente. Concentrée, elle est corrosive et souvent appelée lessive de soude.
Les propriétés chimiques de l'hydroxyde de sodium sont surtout liées à l'ion hydroxyde HO- qui est une base forte. En outre, l'hydroxyde de sodium réagit avec le dioxyde de carbone (CO2) de l'air et se carbonate.
La solubilité de la soude caustique dans l'eau augmente avec la température, à pression constante ou ambiante.
Microfibres
Microscopie électronique à balayage
Polyéthylène téréphtalate
Teinture -- Fibres textiles synthétiques
TricotIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Sea–island-type polyethylene terephthalate ultramicrofibre (0.007 denier per filament) with a single fibre diameter of ca. 800 nm has been produced over the last 4 years. Three kinds of sea–island-type polyethylene terephthalate knitted fabric manufactured from this ultramicrofibre were alkali treated, and their dissolution behaviour was investigated. It was found that the dissolution ratio was dependent upon temperature and sodium hydroxide concentration in the alkali treatment. Practical dissolution ratios mostly reached the theoretical values after alkali treatment with 1.0% (w/w) sodium hydroxide solution at 95 °C for 40 min in all samples. Alkali dissolution of the sea component and revealing of the island component were confirmed by differential scanning calorimetry and scanning electron microscopy. Alkali dissolution behaviour could also be monitored indirectly by the cationic dye staining method. While all untreated samples exhibited high colour yield values after cationic dyeing, alkali-treated samples showed reduced colour yield values with increasing alkali treatment time and a final levelling-off point. Note de contenu : - EXPERIMENTAL : 1. Materials - 2. Alkali dissolution - 3. Differential scanning calorimetry - 4. Cationic dyeing - 5. Scanning electron microscopy
- RESULTS AND DISCUSSION : 1. Dissolution radio - 2. Cationic dye staining - 3. Surface and cross-sectional morphologyDOI : 10.1111/cote.12105 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12105 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22071
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 334-339[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible Oxidative decolorisation of Eriochrome Black T with Chloramine-T : kinetic, mechanistic, and spectrophotometric approaches / Adalegere S. Manjunatha in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Oxidative decolorisation of Eriochrome Black T with Chloramine-T : kinetic, mechanistic, and spectrophotometric approaches Type de document : texte imprimé Auteurs : Adalegere S. Manjunatha, Auteur ; Anu Sukhdev, Auteur ; Puttaswamy, Auteur Année de publication : 2014 Article en page(s) : p. 340-348 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Oxydation
Décoloration
Eaux usées -- RecyclageTags : 'Milieu acide' alcalin' 'Chloramine-T' 'Eriochrome Black T' 'Sodium N-chloro-p-toluenesulfonamide' Index. décimale : 667.3 Teinture et impression des tissus Résumé : The kinetics and mechanism of oxidative decolorisation of Eriochrome Black T (EBT) with sodium N-chloro-p-toluenesulfonamide or Chloramine-T (CAT), catalysed by osmium tetroxide [Os(VIII)] in alkaline medium and uncatalysed in acid medium, have been spectrophotometrically investigated at 303 K. The reaction exhibited a first-order dependence of rate on [CAT]0 and [EBT]0 in both media, and also with respect to [H+]. The order with respect to [OH-] and [Os(VIII)] was fractional. Activation parameters were deduced. It was observed that the uncatalysed decolorisation reaction was ca. eightfold faster in acid medium in comparison with alkaline medium, while the Os(VIII)-catalysed reaction was ca. sevenfold faster than the uncatalysed reaction. Mechanisms and rate laws were determined. The chemical oxygen demand of Eriochrome Black T dye was also determined. Importantly, the developed oxidative decolorisation method is simple, efficient, inexpensive, requires less time, and is environmentally benign. Hence, it can be adapted for treating Eriochrome Black T present in industrial and laboratory wastewater. Note de contenu : - EXPERIMENTAL : 1. Materials and methods - 2. Stoichiometry and characterisation of products
- RESULTS AND DISCUSSION : 1. Reactive species of Chloramine-T - 2. Tautomerism of Eriochrome Black T - 3. Reaction scheme and rate law in acid medium - 4. Reaction scheme and rate law in alkaline mediumDOI : 10.1111/cote.12104 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12104 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22072
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 340-348[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible Effect of N,N-diethyl-m-toluamide on the structure and dyeing properties of meta-aramid and para-aramid fibre / Le-Yan Lei in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Effect of N,N-diethyl-m-toluamide on the structure and dyeing properties of meta-aramid and para-aramid fibre Type de document : texte imprimé Auteurs : Le-Yan Lei, Auteur ; Ya-Hong Mao, Auteur ; Xiao-Feng Xu, Auteur ; Jin-Qu Zheng, Auteur ; Qing-Kang Zheng, Auteur ; Yu Guan, Auteur ; Xiao-Min Fan, Auteur Année de publication : 2014 Article en page(s) : p. 349-356 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Solubilité
Colorants dispersésCatégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester.
Fibre aramide
Teinture -- Fibres textiles synthétiques
Transition vitreuseIndex. décimale : 667.3 Teinture et impression des tissus Résumé : N,N-Diethyl-m-toluamide has been widely used in the mosquito-repellent finishing of textiles over the past few decades, but the use of N,N-diethyl-m-toluamide as a dye carrier for aramid dyeing with disperse dye has been seldom reported. Meanwhile, the application of aramid fibre in clothing is limited because it is difficult to dye. In this work, the effect of N,N-diethyl-m-toluamide on the dyeing properties of aramid fibre was examined by measuring the percentage disperse dye exhaustion under different conditions. In order to understand the mechanism by which N,N-diethyl-m-toluamide promotes the exhaustion of disperse dye on aramid fibre, the ultraviolet-visible spectrum of the dye and N,N-diethyl-m-toluamide solution, the glass transition temperature, the crystalline structure, and the degree of orientation of aramid fibre treated with N,N-diethyl-m-toluamide were measured by ultraviolet-visible spectrophotometry, differential scanning calorimetry, X-ray diffraction analysis, and velocity-oriented tests respectively. The results indicated that N,N-diethyl-m-toluamide not only could reduce the glass transition temperature and degree of orientation of aramid fibre but could also improve the solubility of disperse dye in aqueous solution, and therefore could enhance the percentage disperse dye uptake on aramid fibre, whereas treatment with N,N-diethyl-m-toluamide showed little effect on the crystalline structure of aramid fibre. The results implied that N,N-diethyl-m-toluamide was beneficial to the diffusion of disperse dye molecules into the amorphous region of aramid fibre under the dyeing conditions, but seldom affected the mechanical properties of aramid fibre. Note de contenu : - EXPERIMENTAL : 1. Materials - 2. Pretreatment - 3. Fibre dyeing - 4. Measurement of dye exhaustion and solubility - 5. Measurement of dye solubility - 6. Differential scanning calorimetry - 7. X-ray diffraction analysis - 8. Measurement of degree of orientation - 9. Measurement of tensile strength
- RESULTS AND DISCUSSION : 1. Effect of dyeing temperature on percentage dye exhaustion - 2. Effect of N,N-diethyl-m-toluamide concentration on percentage dye exhaustion - 3. Effect of dyeing time on percentage dye exhaustion - 4. Effect of disperse dye concentration on percentage dye exhaustion - 5. Effect of N,N-diethyl-m-toluamide on the solubility of the disperse dye - 6. Effect of N,N-diethyl-m-toluamide on the glass transition temperature of aramid fibre - 7. Effect of N,N-diethyl-m-toluamide on the crystalline structure of aramid fibre - 8. Effect of N,N-diethyl-m-toluamide on the orientation of poly(p-phenylene terephtalamide) fibre - 9. Effect of N,N-diethyl-m-toluamide on the mechanical properties of aramid fibreDOI : 10.1111/cote.12106 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12106 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22073
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 349-356[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible Practical realisation of ozone clearing after disperse dyeing of polyester / Seda Gundogan in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Practical realisation of ozone clearing after disperse dyeing of polyester Type de document : texte imprimé Auteurs : Seda Gundogan, Auteur ; Hüseyin Aksel Eren, Auteur Année de publication : 2014 Article en page(s) : p. 357-362 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie textile
Fibres polyesters
Ozone
Solidité de la couleur
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, a novel system utilising ozone in jet dyeing machines is introduced, and the results of ozone-clearing treatments of disperse dyed polyester on the prototype modified machine are reported. A Venturi injector was mounted on the liquor circulation pipe of the jet dyeing machine to feed ozone gas into the machine. Ozone was generated via an ozone generator by feeding conditioned air into the generator. The ozone gas entering the pipe partly dissolved in the treatment liquor; the dissolved portion and the gaseous ozone interacted via the fabric in the pipe, especially in the nozzle and also at the bottom of the autoclave (machine body). Disperse dyed polyester fabrics of textile-company mass production were ozone cleared in this prototype. Ozone clearing was achieved in cold water (room temperature), and no other chemicals were used. The colour of the samples, wet fastness properties, and the chemical oxygen demand of the effluent were investigated, and costs were compared with those of conventional reduction clearing of ozone. Results were outstanding: an 83% cost reduction, 67% timesaving, and an 88% COD reduction were achieved. Note de contenu : - Colour differences of the dyed fabrics
- Fastness properties of the dyed fabrics
- Strength properties of the dyed fabrics
- Environmental benefit of the ozone-clearing process
- Time and cost benefits of the ozone-clearing processDOI : 10.1111/cote.12102 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12102 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22074
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 357-362[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible Prediction of recipes for cotton cationisation and reactive dyeing to shade match conventionally dyed cotton / Matthew J. Farell in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Prediction of recipes for cotton cationisation and reactive dyeing to shade match conventionally dyed cotton Type de document : texte imprimé Auteurs : Matthew J. Farell, Auteur ; Mary Ankeny, Auteur ; Peter J. Hauser, Auteur Année de publication : 2014 Article en page(s) : p. 363-367 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cationisation
Colorants acides
CotonLe 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).
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Cationisation allows cotton to be dyed with anionic dyestuffs (including anionic pigment dispersions) without the need for salt, and with decreased usage of dye, water, and energy. Appropriate cationisation levels play a part in dyeing properties such as fabric levelness, in fastness properties such as lightfastness, and in the overall cost of the cationisation treatment. The objective of this work is to assess whether it is possible simultaneously to predict a dye recipe and cationisation treatment level for cotton to yield a colourless or nearly colourless dyebath at the completion of the dyeing to match the shade of conventional fibre reactive dyeing of cotton. It has been shown that it is possible to model a cold pad batch cationisation process, relate the colour yield data and cationisation level for individual dyes, and finally predict a dyeing recipe and the required corresponding cationisation treatment to match the shade of conventional fibre reactive dyeing of cotton. The predicted dye recipe and cationisation amount yield colourless or nearly colourless dyebaths at the conclusion of the dyeing process. Note de contenu : - Percentage nitrogen prediction from cold pad batch cationisation
- Percentage nitrogen and colour yield relationships from saturation dyeings
- Colour yield and percentage dye relationships from primary dyeings
- Dye and treatment predictionDOI : 10.1111/cote.12101 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12101 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22075
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 363-367[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible A general metric for the magnitude of observer metamerism / Boris Sluban in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : A general metric for the magnitude of observer metamerism Type de document : texte imprimé Auteurs : Boris Sluban, Auteur ; Peyvandi Shahram, Auteur ; Shirin Charmchi Avval, Auteur ; Seyed Hossein Amirshahi, Auteur Année de publication : 2014 Article en page(s) : p. 368-375 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mathématique
Analyse numérique
Métamérisme
vision des couleursIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Observer metamerism is defined as a property of a pair of spectrally different stimuli having the same colour sensation for an individual (reference) observer. Frequently, samples in this pair no longer match if the observer is changed. In this article, a linear approximation formula is developed that predicts a metameric effect caused by small changes in the observer's colour-matching functions. This approximation formula enables a general metric of observer metamerism, the observer metamerism potential, to be defined that is independent of any particular deviated observer but still provides a close link to ‘observer-metameric’ colour difference. Numerical experiments were conducted to investigate the correlation between the observer metamerism potential and the maximum of 53 metameric colour differences caused by the change from the colour-matching functions of CIE standard 10° observer to the colour-matching functions of 49 Stiles and Burch's real 10° test observers. The proposed general metric, together with a previous metric proposed by the present authors, the illuminant metamerism potential, could be taken as a quantitative measure of the performance of spectral approximation methods. Note de contenu : - Approximation of the Colour change caused by change in the observer's CMFs
- Definition and calculation of the observer metamerism potential
- Numerical examplesDOI : 10.1111/cote.12100 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12100 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22076
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 368-375[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible Effects of starch addition on the characteristics of CoAl2O4 nano pigments / Leila Torkian in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Effects of starch addition on the characteristics of CoAl2O4 nano pigments Type de document : texte imprimé Auteurs : Leila Torkian, Auteur ; Elham Radmanesh, Auteur ; Maryam Daghighi, Auteur Année de publication : 2014 Article en page(s) : p. 376-379 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amidons
Bleu de cobalt
Colorimétrie
Matériaux nanocristallins
Nanoparticules -- Synthèse
Pigments inorganiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Nanocrystalline cobalt aluminate spinel, CoAl2O4, was prepared via a microwave-assisted solution combustion process applying various mixtures of urea, glycine, and starch as a novel mixed fuel. The effects of starch addition (0, 10, 20, and 30 wt%) on the physical characteristics (e.g. crystallite size and colour) of the blue nano pigments were also investigated. The resultant powders were characterised by means of X-ray diffraction, scanning electron microscopy, electron dispersive X-ray analysis, and CIE L*a*b* colour measurements. The presence of a CoAl2O4 spinel lattice after calcination of precursors at 600 °C was confirmed by X-ray diffraction patterns, and the crystallite sizes were ca. 10–39 nm. Colorimetric data pointed to the formation of bright-blue pigments at low levels of starch addition. Scanning electron microscope images showed that starch enrichment reduced the agglomeration and size of synthesised nanoparticles. Note de contenu : - EXPERIMENTAL : 1. Powder synthesis - 2. Characterisation methods
- RESULTS AND DISCUSSION : 1. X-ray diffraction analysis and CIE L*a*b colour measurements - 2. Scanning electron microscope characterisation and electron dispersive X-ray analysisDOI : 10.1111/cote.12103 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12103 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22077
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 376-379[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16561 - Périodique Bibliothèque principale Documentaires Disponible
Exemplaires (1)
Code-barres | Cote | Support | Localisation | Section | Disponibilité |
---|---|---|---|---|---|
16561 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |