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COLORATION TECHNOLOGY / Society of dyers and colourists . Vol. 134, N° 6Mention de date : 12/2018Paru le : 17/12/2018 |
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Ajouter le résultat dans votre panierMeasuring photostability through glass : the application of microfading testing to the study of framed pastel artworks / Julio M. del Hoyo-Meléndez in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)
[article]
Titre : Measuring photostability through glass : the application of microfading testing to the study of framed pastel artworks Type de document : texte imprimé Auteurs : Julio M. del Hoyo-Meléndez, Auteur ; Pawel Swit, Auteur ; Joanna Sobczyk, Auteur Année de publication : 2018 Article en page(s) : p. 412-422 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mesure
Objets d'art -- Conservation et restauration
Oeuvres -- Peintures
PhotostabilitéIndex. décimale : 746.6 Impression, peinture, teinture Résumé : Paper-based heritage objects on exhibition are typically framed using a transparent glazing material such as glass or acrylic. This often makes the task of measuring their light fastness a difficult one since cultural institutions may have unframing restrictions, especially for large-format objects. However, a testing programme recently conducted at the National Museum in Krakow has revealed that in certain cases it is possible to obtain colorant stability information directly from a framed object. Microfading testing results are reliable if the distance from the object to the protective glazing is adequate to allow proper illumination and collection of reflected light. This paper presents a case study of six large-format pastels on paper by Stanisław Wyspiański, one of the most outstanding and versatile artists at the turn of the twentieth century in Poland. Some of the orange and pink areas showed higher sensitivity to light with fading rates that remain within the Blue Wool 1-2 range. The objects have been classified according to the light sensibility of their colorants, and this information has allowed development and implementation of exhibition guidelines that serve to minimise the degradation associated with museum illumination. In addition, scientific imaging, microfading data and computer analysis of the images have allowed virtual representation of the potential colour changes that these artworks may experience as a result of uncontrolled and long exposure to gallery illumination. Note de contenu : - MATERIALS AND METHODS : Pastel paintings - Microfading testing - Evaluation of MFT data - Mathematical treatment of MFT data - Light damage calculations - conversion of CIE L*a*b* data to RGB - Imaging and colour change simulation - Preventive conservation strategy
- RESULTS AND DISCUSSION : Preliminary measurements through a microscope slide using reference materials - Analysis of the pastel painting Polonia - Virtual representation of potential colour changes - Preventive conservation measuresDOI : 10.1111/cote.12365 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12365 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31366
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Code-barres Cote Support Localisation Section Disponibilité 20430 - Périodique Bibliothèque principale Documentaires Disponible Laccase-catalysed coloration of wool and nylon / Chetna D. Prajapati in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)
[article]
Titre : Laccase-catalysed coloration of wool and nylon Type de document : texte imprimé Auteurs : Chetna D. Prajapati, Auteur ; Edward Smith, Auteur ; Faith Kane, Auteur ; Jinsong Shen, Auteur Année de publication : 2018 Article en page(s) : p. 423-439 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Catalyse enzymatique
Colorimétrie
Composés aromatiques
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).
Polyamide 66
Solidité de la couleur
Teinture -- Fibres textiles
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The potential for laccase (EC 1.10.3.2) to be used within the area of textile coloration, specifically for the generation of decorative surface pattern design, remains relatively unexplored. The current study presents a novel process for the coloration of wool and nylon 6,6 fibres via laccase oxidation of aromatic compounds as an alternative to conventional dyeing methods. Emphasis was placed on producing a diverse colour palette, which was achieved through the investigation of three different aromatic compounds as laccase substrates : 1,4-dihydroxybenzene, 2,7-dihydroxynapthalene and 2,5-diaminobenzenesulphonic acid. Reaction processing parameters such as buffer systems and pH values, laccase and aromatic compounds concentration, and reaction times were investigated, all in the absence of additional chemical auxiliaries. Enzymatically dyed fabrics were tested against commercial standards, resulting in reasonably good colour fastness to wash. To demonstrate the coloration and design potential by laccase catalysation of aromatic compounds, specially constructed fabrics using a combination of undyed wool, nylon and polyester yarns were dyed using the one-step laccase-catalysed coloration process. The use of different fibre types and weave structures enabled simple colour variations to be produced. Shadow, reserve and contrasting effects were achieved with the laccase-catalysed dyeing process developed. Important advantages over conventional processing methods include the use of simpler and milder processing conditions that eliminate additional chemical use and reduce energy consumption. Note de contenu : - EXPERIMENTAL : Materials - Fabric preparation - Enzymatic dyeing (one-step in-situ dyeing process) - Colour measurement of dyed fabrics - Colour analysis of enzyme treatment liquor - Colour fastness of enzyme-dyed fabrics
- RESULTS AND DISCUSSION : Effect of pH and buffer systems on the activity of laccase towards aromatic compounds and the coloration of fibres - Analysis of laccase-catalysed colour in enzyme treatment liquors without fabrics - Effect of aromatic compound concentration - Effects of treatment time - Colour fastness - Effect of the amino groups of fibres on laccase-catalysed coloration - Design potentialDOI : 10.1111/cote.12350 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12350 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31369
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Code-barres Cote Support Localisation Section Disponibilité 20430 - Périodique Bibliothèque principale Documentaires Disponible The synthesis and spectroscopic characterisation of 3-formyl-2-quinolones in the presence of biothiols / Aleksandra Grzelakowska in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)
[article]
Titre : The synthesis and spectroscopic characterisation of 3-formyl-2-quinolones in the presence of biothiols Type de document : texte imprimé Auteurs : Aleksandra Grzelakowska, Auteur ; Jolanta Kolińska, Auteur ; Mariusz Makiewicz, Auteur Année de publication : 2018 Article en page(s) : p. 440-449 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Composés organiques -- Synthèse
Essais (technologie)
Photochimie
QuinolonesLes quinolones et fluoroquinolones1,2,3 forment une large classe d'antibactériens de synthèse qui comprennent les dérivés de l'acide nalidixique découvert en 1962 et utilisé chez l'homme dès l'année suivante. Cette famille d'antibactériens a fait l'objet de recherches très importantes aboutissant au dépôt de plus de 10 000 brevets. L'ajout de l'atome de fluor dans les années 1970 a permis d'augmenter fortement la pénétration des molécules quinolones dans les cellules (jusqu'à 200 fois plus) : ce fut la naissance des fluoroquinolones, puissants antibiotiques capables de lutter contre une grande variété de germes chez l'homme et l'animal.Index. décimale : 667.3 Teinture et impression des tissus Résumé : The derivatives of 3-formyl-2(1H)-quinolones and N-methyl-3-formyl-2-quinolones substituted in the 6-position with either a methyl or a methoxy group were synthesised and evaluated as potential sensors for the detection of thiol amino acids. Their spectroscopy properties, including absorption and emission spectra, fluorescence quantum yields and singlet lifetimes, were examined. The behaviour of the obtained compounds was studied at pH 7.4 in the presence of various amino acids. The results show that these compounds demonstrate a high turn-off fluorescence response and selectivity toward L-cysteine in the presence of other amino acids, and have the potential to act as sensors to L-cysteine. Note de contenu : - Synthesis
- Materials
- Preparation of stock and test solutions
- Spectroscopic measurements and photochemical experimentsDOI : 10.1111/cote.12355 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12355 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31370
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Code-barres Cote Support Localisation Section Disponibilité 20430 - Périodique Bibliothèque principale Documentaires Disponible A physicochemical characterisation of a medieval herbal ink, Mahi, of Assam, India / Barsha R. Goswami in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)
[article]
Titre : A physicochemical characterisation of a medieval herbal ink, Mahi, of Assam, India Type de document : texte imprimé Auteurs : Barsha R. Goswami, Auteur ; Nabadweep Chamuah, Auteur ; Dutta, Robin K., Auteur Année de publication : 2018 Article en page(s) : p. 450-463 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Caractérisation
Chimie végétale
Encre
Encre -- Analyse
MahiIndex. décimale : 667.4 Encres Résumé : Mahi, a unique herbal ink used in medieval Assam in India for writing and illustrating manuscripts, is known for its intense colour and durability for centuries, and its non‐corrosive nature. Mahi is distinctly different from the other contemporary inks used elsewhere in the world, including other parts of India. The interesting features of Mahi are due to its special recipe involving several herbal ingredients in addition to iron sourced from fish blood or the rust of iron tools, with cow urine as an extractant and solvent. The objective of the current study is an in-depth understanding of the traditional method of the preparation of Mahi, and its characterisation through analysis of the physicochemical properties using spectroscopic and imaging techniques as well as biochemical analysis. A series of model Mahi samples are prepared following the traditional method with varying ingredients, and their compositions and physicochemical properties are evaluated with respect to the ingredients using standard methods and analytical tools including atomic absorption spectroscopy, tensiometry, ultraviolet (UV)-visible, Fourier Transform-infrared (FT-IR), Raman, steady-state fluorescence, UV fluorescence and emission microscopy. The colour of the ink has been attributed to various polyphenols, gallic acid, epigallocatechin gallate, epicatechin, quercetin, kaempferol and tannic acid, and their iron complexes. UV fluorescence and emission microscopy confirmed an autofluorescence indicative of the presence of phenolic and chlorophyll pigments. Solubilisation by glycosidic biosurfactant contributes to stabilisation of Mahi. The non-corrosive nature of Mahi has been attributed to its neutral pH and absence of free iron and copper ions. Note de contenu : - EXPERIMENTAL : Preparation of Mahi - Reagents and chemicals - Phytochemical analysis - Instrumental analyses
- RESULTS AND DISCUSSION : Physicochemical properties of the Mahi samples - Phytochemical analysis - Colour coordinatye study - HPLC analysis of Mahi - UV-VIS absorption behaviour - FT - IR absorption behaviour - Raman scattering by Mahi samples - Steady-state fluorescence spectraDOI : 10.1111/cote.12366 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12366 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31379
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Code-barres Cote Support Localisation Section Disponibilité 20430 - Périodique Bibliothèque principale Documentaires Disponible Improvement in the light fastness of dyed meta-aramid fabric using titanium dioxide nanoparticles / Ravindra D. Kale in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)
[article]
Titre : Improvement in the light fastness of dyed meta-aramid fabric using titanium dioxide nanoparticles Type de document : texte imprimé Auteurs : Ravindra D. Kale, Auteur ; Yashlok Maurya, Auteur ; Satyapriya Dash, Auteur ; Tejasvi Potdar, Auteur Année de publication : 2018 Article en page(s) : p. 464-469 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur)
Colorants
Dioxyde de titane
Fibre aramide
Granulométrie
Jaune
Nanoparticules
Photostabilité
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Meta-aramid fibre is very difficult to dye because of its very high crystallinity. The major issues with dyeing meta-aramid fibre are its selective dyeability with a particular class of dye and poor light fastness, especially with basic dyes, which is not acceptable. In this work, various dyeing trials of meta-aramid fabric with two commercial basic dyes, Bezacryl Golden Yellow GL 200 and Bezacryl Blue FBS, were conducted on high temperature–high pressure and infrared dyeing machines. To improve the light fastness of dyed samples, titanium dioxode nanoparticles were applied on dyed fabric using a layer-by-layer technique. Fastness properties such as light, wash and rubbing were checked for untreated and titanium dioxode-treated samples. Titanium dioxode application on dyed material improved the light fastness of Bezacryl Golden Yellow-dyed samples significantly, and Bezacryl Blue FBS also showed an improved rating compared with that previously reported. Improvement in light fastness is selective but it is still a novel and viable route to improve the light fastness of dyed meta-aramid fabrics. Note de contenu : - EXPERIMENTAL : Materials - Methods - Characterisation
- RESULTS AND DISCUSSION : Particule size analysis of titanium dioxide powderDOI : 10.1111/cote.12363 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12363 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31380
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Code-barres Cote Support Localisation Section Disponibilité 20430 - Périodique Bibliothèque principale Documentaires Disponible Dimerised heterobifunctional reactive dyes. Part 1 : characterisation using quadrupole time-of-light mass spectrometry / Nadia Sultana in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)
[article]
Titre : Dimerised heterobifunctional reactive dyes. Part 1 : characterisation using quadrupole time-of-light mass spectrometry Type de document : texte imprimé Auteurs : Nadia Sultana, Auteur ; Yixin Liu, Auteur ; Harold S. Freeman, Auteur ; Nelson R. Vinueza, Auteur Année de publication : 2018 Article en page(s) : p.470-477 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur)
Colorants -- Analyse
Colorants réactifs
Dimères
Hexaméthylène diamine
Rouge (couleur)
Spectrométrie de masseIndex. décimale : 667.2 Colorants et pigments Résumé : As part of an approach to enhancing the efficiency of reactive dye adsorption on cellulosic fibres at low electrolyte levels, commercially available dyes were dimerised using hexamethylenediamine (HMDA) as a linking group. A key component of this work involved using high-resolution mass spectrometry (HRMS) to characterise a group of polysulphonated heterobifunctional monochlorotriazine/vinyl sulphone reactive dyes (CI Reactive Yellow 176, CI Reactive Red 239, CI Reactive Blue 221, CI Reactive Red 194 and CI Reactive Blue 222) and their dimeric analogs. In this respect, dimeric dye ions of differently charged states were observed using HRMS-negative electrospray ionisation in combination with quadrupole time-of-flight mass spectrometry. For example, HRMS showed that the HMDA-linked reaction products were mixtures of the target (unhydrolysed) dimers, hydrolysed dimers, monoreacted products and hydrolysed unreacted dyes, with CI Reactive Yellow 176 and CI Reactive Red 194 producing the desired unhydrolysed dimers. Note de contenu : - EXPERIMENTAL : Materials and reagents - Reactive dye dimer formation- Mass spectrometry
- RESULTS AND DISCUSSION : Characterisation of parent dyes - Characterisation of dimeric structuresDOI : 10.1111/cote.12368 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12368 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31381
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Code-barres Cote Support Localisation Section Disponibilité 20430 - Périodique Bibliothèque principale Documentaires Disponible Solvatochromism and quantum mechanical investigation of disazo pyridone dye / Dusan Mijin in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)
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Titre : Solvatochromism and quantum mechanical investigation of disazo pyridone dye Type de document : texte imprimé Auteurs : Dusan Mijin, Auteur ; Bojan D. Bozic, Auteur ; Jelena Ladarevic, Auteur ; Luka Matovic, Auteur ; Gordana S. Uscumlic, Auteur ; Vesna D. Vitnik, Auteur ; Zeljko Vitnik, Auteur Année de publication : 2018 Article en page(s) : p. 478-490 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Analyse
Colorants azoïques
Solvatochromisme
Théorie quantiqueIndex. décimale : 667.2 Colorants et pigments Résumé : Disazo pyridone dye, 4‐methyl‐2,6‐dioxo‐5‐(2‐(4‐(phenyldiazenyl)phenyl)hydrazono)‐1,2,5,6‐tetrahydropyridine‐3‐carbonitrile, is synthesised and thoroughly characterised by a combination of experimental and computational approaches. Fourier Transform‐infrared and nuclear magnetic resonance (NMR) spectra prove the existence of the hydrazone form in the solid state and in dimethyl sulphoxide, which is also supported by vibrational and NMR theoretical studies. Ultraviolet (UV) spectral properties, as well as solvatochromism in 19 solvents of different polarity, are investigated. In most of the solvents, the dye is solely present in the hydrazone form, whereas in certain solvents, an acid–base equilibrium exists. Excellent agreement between computational and experimental UV–visible data was established. Frontier Molecular Orbital analysis was performed and proved the existence of intramolecular charge transfer through the dye molecule. A molecular electrostatic potential surface was plotted over the optimised geometry to lighten the reactivity of the investigated molecule. Note de contenu : - EXPERIMENTAL : Materials and measurements - Synthesis - 4-methyl-2,6-dioxo-5-(2-(4-(phenyldiazenyl)phenyl)hydrazono)-1,2,5,6-tetrahydropyridine-3-carbonitrile - Method of calculation
- RESULTS AND DISCUSSION : The solvent effect on absorption spectra - Correlation with multiparameter solvent polarity scales - Molecular geometry- Vibrational analysis - NMR analysis - UV-Vis studies and electronic properties - Molecular electrostatic potentialDOI : 10.1111/cote.12369 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12369 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31382
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Code-barres Cote Support Localisation Section Disponibilité 20430 - Périodique Bibliothèque principale Documentaires Disponible Natural iron oxide (earth colour) deposits in Latvia : an assessment of the possibilities for their use in inorganic pigment manufacturing / Aigards Kokins in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)
[article]
Titre : Natural iron oxide (earth colour) deposits in Latvia : an assessment of the possibilities for their use in inorganic pigment manufacturing Type de document : texte imprimé Auteurs : Aigards Kokins, Auteur ; Juris Kostjukovs, Auteur ; Liga Zarina, Auteur Année de publication : 2018 Article en page(s) : p. 491-500 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Oxyde de fer
Pigments inorganiques -- Analyse
Pigments métalliquesIndex. décimale : 667.2 Colorants et pigments Résumé : In Latvia, iron oxide pigments for paints, stains and coatings are all imported, although the land is rich in sources of iron (earth colour). The aim of this study was to evaluate earth colour deposits in Latvia and to assess the possibilities for their use in natural earth pigment manufacturing. The study included tests of colour pigments available in the Latvian market, as well as evaluation of samples from earth colour deposits in Lunkeči and Kazuleja in Latvia, to determine their quality, chemical composition, and physical characteristics. The research continued with tests of production technology for inorganic pigment manufacturing (enrichment, processing, etc.). The study results showed that the quality of the pigments obtained does not differ significantly from the supply available in the market, pointing to the potential use of natural iron oxide deposits in Latvia for inorganic pigment manufacturing. Note de contenu : - Natural iron oxides ( earth colour)
- The history of natural earth pigments
- The iron oxide trade in Latvia
- Iron oxide deposits in Latvia
- Geospatial characteristics of th earth colour deposits studied
- Materials and methods
- Discussion of the test resultsDOI : 10.1111/cote.12367 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12367 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31383
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