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COLORATION TECHNOLOGY / Society of dyers and colourists . Vol. 135, N° 1Mention de date : 02/2019Paru le : 06/02/2019 |
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Ajouter le résultat dans votre panierExtraction of anthocyanins from Aronia melanocarpa skin waste as a sustainable source of natural colorants / Muhammad H. Wathon in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : Extraction of anthocyanins from Aronia melanocarpa skin waste as a sustainable source of natural colorants Type de document : texte imprimé Auteurs : Muhammad H. Wathon, Auteur ; Nicholas Beaumont, Auteur ; Meryem Benohoud, Auteur ; Richard S. Blackburn, Auteur ; Christopher M. Rayner, Auteur Année de publication : 2019 Article en page(s) : p. 5-16 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption
Anthocyanes
Colorants végétaux
Extraction (chimie)Index. décimale : 667.2 Colorants et pigments Résumé : Aronia melanocarpa (Michx.) Elliott (black chokeberry) skin wastes from the production of Aronia fruit juice were extracted using a batch extraction method and a novel integrated extraction-adsorption process. Optimum conditions for batch extraction were as follows: 60 °C, 3 h, acid (0.1% v/v hydrochloric acid), biomass-to-solvent ratio of 1:16, and biomass-to-solid phase extraction resin ratio of 1:1. The integrated extraction-adsorption process gave improved anthocyanin yields of higher quality when the process was performed for 3 h without cooling of the circulating liquid, and with a flow rate of 1.3 ml s-1. Overall, the new method showed better anthocyanin yield and purity compared with the batch method, increasing the extraction yield by ca. 20% (5.25 6.34 mg g-1 dry weight of pomace) and increasing anthocyanin content by ca. 40% (19.9 28.4% w/w dry weight of extract). This method also simplified the process as three steps were eliminated saving time and energy. Furthermore, the integrated extraction-adsorption method is industrially scalable to produce large quantities of anthocyanins. In the batch method, anthocyanins present in A. melanocarpa skins were identified as cyanidin-3-O-galactoside (38.8%), cyanidin-3-O-arabinoside (6.4%), cyanidin-3-O-glucoside (3.6%), cyanidin-3-O-xyloside (0.5%), and the cyanidin aglycon (50.7%); in the continuous method, anthocyanin content was cyanidin-3-O-galactoside (45.7%), cyanidin-3-O-arabinoside (16%), cyanidin-3-O-glucoside (3.6%), cyanidin-3-O-xyloside (2.7%), and the cyanidin aglycon (32%). The integrated extraction-adsorption method was shown to be substantially less susceptible to acid-catalysed anthocyanin decomposition processes. All anthocyanins were derived from only one anthocyanidin parent structure (cyanidin), and only monosaccharide glycosides were identified, which is unusual when compared with other berries that typically have more anthocyanidins and/or greater glycosylation diversity. Note de contenu : - Chemicals and materials
- General procedures and instrumentation
- Sequential batch extraction - adsorption method
- Integrated extraction-adsorption method
- Fig. 1 : Effect of pH on anthocyanin structure and resultant colour
- Fig. 2 : Experimental set-up for the integrated extraction-adsorption process. Arrows indicate direction of flow of extracted liquid
- Fig. 3 : Extraction profiles during a batch extraction of Aronia melanocarpa waste skins at various temperatures. The absorbance was monitored using a UV-vis spectrometer at 520 nm
- Fig. 4 : Extraction profiles during a batch extraction of Aronia melanocarpa waste skins at different pH (2.4 and 5.2) at 60°C. The absorbance was monitored a UV-vis spectrometer at 520 nm
- Fig. 5 : Effect of pH on UV-vis absorbance of anthocyanins extracted from Aronia melanocarpa waste skins; measurement was carried out on post-SPE residues of th ethanol elute [1 mg extract in 1 ml acidified water (0.1% v/v hydrochloric acid)]. The colours of aqueous solutions tested are shown at the top
- Fig. 6 : H-NMR spectra of post-SPE residues of ethyl acetate elute and ethanol elute. The 1H-NMR spectra were recorded at 500 MHz. Labels 1–5 refer to the five signals seen in the H NMR spectra of anthocyanins and correspond to their H-4 protons
- Fig. 7 : The comparison between (left) a batch method and (right) an integrated extraction-adsorption method
- Fig. 8 : Total anthocyanins calculated according to relative % shown in HPLC chromatograms of the batch method and the integrated method. Solvent A : H2O : TFA (99.5:0.5) ; solvent B : acetonitrile. Detected by DAD at 520 nm
- Fig. 9 : Profile of anthocyanins shown in HPLC chromatograms of (a) the batch and (b) the integrated method. Solvent A: H2O/TFA (99.5:0.5) ; solvent B: acetonitrile. Detected by DAD at 520 nm : 1. Cy3gal ; 2. Cy3ara ; 3. Cy3glc ; 4. Cy3xyl ; 5. cyanidin (aglycon) ; 6. polymeric species
- Fig. 10 : H-NMR spectra of post-SPE residues of ethanol wash for the batch method and the integrated method. The 1H-NMR spectra were recorded at 500 MHz. Labels 1–5 refer to the five signals seen in the H NMR spectra of anthocyanins and correspond to their H-4 protons
- Fig. 11 : The effect of acid concentration on total anthocyanins calculated according to relative % shown in HPLC chromatograms of (a) the batch and (b) the integrated method. Solvent A : H2O/TFA (99.5:0.5) ; solvent B: acetonitrile. Detected by DAD at 520 nmDOI : 10.1111/cote.12385 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12385 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31660
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible The release of the blue biological pigment C-phycocyanin through calcium-aided cytolysis of live Spirulina sp. / Robert W. M. Pott in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : The release of the blue biological pigment C-phycocyanin through calcium-aided cytolysis of live Spirulina sp. Type de document : texte imprimé Auteurs : Robert W. M. Pott, Auteur Année de publication : 2019 Article en page(s) : p. 17-21 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur)
Colorants microbiens
PhycocyanineLa phycocyanine (du grec phyco signifiant "algue" et cyanine venant de la couleur "cyan", qui est dérivé du grec "kyanos" et signifie bleu-vert) est l'association de protéines de la famille des phycobiliprotéines, et de pigments hydrosolubles de la photosynthèse, les phycocyanobilines. Toutes les phycobiliprotéines sont solubles dans l'eau et ne peuvent donc exister à l'intérieur d'une membrane, contrairement aux complexes protéines-pigments des végétaux supérieurs, (porteurs de caroténoïdes, et de chlorophylles), mais peuvent s'agréger pour former des complexes collecteurs de lumière, nommés phycobilisomes, qui adhèrent à la membrane thylakoïdale.
La phycocyanine absorbe les lumières orange et rouge, dans des longueurs d'onde plutôt proches de 600 nm (dépendant de son type spécifique), et émet de la fluorescence à environ 650 nm (dépendant aussi de son type). L'allophycocyanine absorbe et émet à des longueurs d'onde plus élevées que la phycocyanine C ou la phycocyanine R.
Les phycocyanines peuvent se trouver dans les Cyanobactéries (appelées auparavant "algues bleu-vert"), les Glaucophytes et les algues rouges.
Les phycobiliprotéines ont des propriétés de fluorescence qui sont utilisées dans la méthode immuno-enzymatique ELISA.
SpirulinesIndex. décimale : 667.2 Colorants et pigments Résumé : C-phycocyanin is a light-harvesting phycobiliprotein found in, amongst other species, the cyanobacterium Spirulina sp. C-phycocyanin is bright blue in colour and can be used as a natural blue colorant for a variety of applications. Various cell disruption methods exist to cause the lysis of the cyanobacterial cells and release of phycocyanin, but these methods have significant drawbacks, such as cost, difficulty in scale-up, bacterial contamination, or risk of degrading the protein. This article outlines an alternative method for cell disruption based on the use of Ca(II), which lyses live Spirulina biomass, releasing phycocyanin at a range of concentrations (0.1–0.8 m) over varying time periods, depending on the conditions. In comparison with other ionic species tested, Ca(II) performed best by a significant margin. Bead milling of biomass was used to quantify the maximum phycocyanin in the biomass, and the greatest was found to be ca. 90% released into solution after 48 h under 0.5 m Ca(II) in a 0.35 m acetate buffer at pH 6. Exposing Spirulina to sodium azide revealed that the mechanism of Ca(II) ion-aided cytolysis is likely based on a metabolically driven process. This study demonstrates a potential processing option for the release of phycocyanin from live Spirulina, paving the way for the development of a novel bioprocess for the industrial production of the biological pigment. Note de contenu : - Cultivation of Spirulina in an airlift reactor
- Quantification of phycocyanin in solution using a spectrophotometer
- Preparation of biomass
- Phycocyanin extraction by bead milling
- Calcium- and other salt-aided phycocyanin release tests
- Sodium azide tests
- Fig. 1 : Process flow diagram of a potential phycocyanin production process
- Fig. 2 : Release of C-phycocyanin (cPC) from Spirulina biomass over time during grinding with 0.1 mm Dakot media in a 0.35 m pH 6 acetate buffer solution
- Fig. 3 : Release of phycocyanin from Spirulina biomass at three time points when exposed to varying Ca(II) concentrations
- Fig. 4 : Release of phycocyanin from Spirulina biomass over time, in 0.35 m pH 6 acetate buffer under various Ca(II) concentrations
- Fig. 5 : % phycocyanin released after 24 h when Spirulina biomass is treated with 0.5 m ions in 0.35 m pH 6 acetate buffer. Error bars represent the standard deviation of three repeats
- Fig. 6 : Release of phycocyanin after 24 h from Spirulina biomass, in 0.35 m pH 6 acetate buffer, under (a) control – no azide, no Ca(II), (b) 0.035% azide with 0.5 m Ca(II) (exposed to light), (c) 0.035% azide with 0.5 m Ca(II) (not exposed to light), (d) 0.5 m Ca(II) without azide, and (e) azide added after cytolysis as in (d). Error bars represent the standard deviation of three repeatsDOI : 10.1111/cote.12373 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12373 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31661
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible Fungal colorants in applications - focus on Cortinarius species / Riikka Räisänen in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : Fungal colorants in applications - focus on Cortinarius species Type de document : texte imprimé Auteurs : Riikka Räisänen, Auteur Année de publication : 2019 Article en page(s) : p. 22-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anthraquinone
Colorants fongiques
Extraction (chimie)
Impression sur étoffes
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Secondary metabolites in fungi offer an interesting source of bio-based compounds that could be used as colorants in many applications. From a historical point of view, fungal natural dyes have been used more rarely than plant-based dyes. This paper investigates the potential of fungal colorants, using Cortinarius species as examples. In our research, fruiting bodies of the fungi Cortinarius sanguineus and Cortinarius semisanguineus were used as sources of anthraquinone dyestuffs. From 10 kg of fresh fruiting bodies, 60 g of anthraquinone powder was obtained, 6% of the dry weight content. The most abundant compounds were emodin, dermocybin and their glucosides, which formed over 90% of the total dyestuff amount. Pure emodin and dermocybin, as well as the crude water extract, were used for the dyeing and printing of natural and synthetic fibres. Conventional mordant techniques and high-temperature (HT) disperse dye techniques were applied, and light and washing fastness were tested according to International Organization for Standardization standards. Our experiments show that the yields of dye powders extracted from fungi are reasonable compared with the yields of, for example, madder (Rubia tinctorum). Natural anthraquinones produce strong and bright colours on several types of fibres. In particular, for HT disperse dyed polyester, the light and washing fastness properties were excellent. Anthraquinones are common in nature and there are many fungal species which produce them, so there are a variety of possibilities for growing fungi. The use of large-scale cultures is an interesting perspective for future biocolorant production. Note de contenu : - Obtaining colorants
- Yields of biocolorants
- Anthraquinones in C. sanguineus, C. vitiosus and C. semisanguineus
- Dyeing and printing
- Colour fastness properties of anthraquinones in dyed and printed fabricsDOI : 10.1111/cote.12376 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12376 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31662
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible Extraction of polyphenolic substances from bark as natural colorants for wool dyeing / Christa Fitz-Binder in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : Extraction of polyphenolic substances from bark as natural colorants for wool dyeing Type de document : texte imprimé Auteurs : Christa Fitz-Binder, Auteur ; Thomas Bechtold, Auteur Année de publication : 2019 Article en page(s) : p. 32-39 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants végétaux
Ecorces
Extraction (chimie)
Laine
Laque et laquage
PolyphénolsLes polyphénols constituent une famille de molécules organiques largement présente dans le règne végétal. Ils sont caractérisés, comme l’indique le nom, par la présence d'au moins deux groupes phénoliques associés en structures plus ou moins complexes, généralement de haut poids moléculaire. Ces composés sont les produits du métabolisme secondaire des plantes.
Les polyphénols prennent une importance croissante, notamment grâce à leurs effets bénéfiques sur la santé. En effet, leur rôle d’antioxydants naturels suscite de plus en plus d'intérêt pour la prévention et le traitement du cancer, des maladies inflammatoires, cardiovasculaires et neurodégénératives. Ils sont également utilisés comme additifs pour les industries agroalimentaire, pharmaceutique et cosmétique
"Ils ont tous en commun la présence d'un ou plusieurs cycles benzéniques portant une ou plusieurs fonctions hydroxyles". La désignation "polyphénols" est consacrée par l'usage et, alors qu'elle ne devrait concerner que les molécules portant plusieurs fonctions hydroxyle phénolique, elle est habituellement utilisée pour l'ensemble de ces composés.
Les polyphénols naturels regroupent donc un vaste ensemble de substances chimiques comprenant au moins un noyau aromatique, portant un ou plusieurs groupes hydroxyle, en plus d’autres constituants. Il y a quatre principales familles de composés phénoliques : les acides phénoliques (catéchol, acide gallique, acide protocatéchique), les flavones, l'acide chlorogénique et les quinones. Ils peuvent aller de molécules simples, comme les acides phénoliques, à des composés hautement polymérisés, de plus de trente mille daltons, comme les tanins (acide tannique).
Les polyphénols sont communément subdivisés en phénols simples, acides phénoliques et coumarines, en naphtoquinones, en stilbénoïdes (deux cycles en C6 liés par deux atomes de carbone), en flavonoïdes, isoflavonoïdes et anthocyanes, et en formes polymérisées : lignanes, lignines, tanins condensés. Ces squelettes carbonés de base sont issus du métabolisme secondaire des plantes, élaborés par la voie du shikimate.
Les polyphénols sont présents dans diverses substances naturelles : sous forme d'anthocyanine dans les fruits rouges, le vin rouge (en relation avec les tanins, phénomène du "paradoxe français"), sous forme de proanthocyanidines dans le chocolat et le vin, d'acides caféoylquinique et féruloylquinique dans le café, de flavonoïdes dans les agrumes, et sous forme de catéchines comme le gallate d'épigallocatéchine dans le thé vert, de quercétine dans les pommes, les oignons, le vin rouge, etc.
D'après une étude réalisée avec des volontaires via Internet, les sources alimentaires de polyphénols sont principalement le café (36,9 %), le thé — vert ou noir — (33,6 %), le chocolat pour son cacao (10,4 %), le vin rouge (7,2 %) et les fruits (6,7 %)18. Parmi les fruits, les polyphénols, très présents dans toutes les pommes, sont encore plus concentrés dans les pommes à cidre (riches en tanin), qui peuvent en contenir jusqu'à quatre fois plus : c'est une biodiversité qui se manifeste en richesse aussi bien qualitativement que quantitativement en polyphénols. (Wikipedia)
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : In Europe, considerable amounts of bark are available from wood‐processing industries such as forestry and timber production. Polyphenolic components can be collected by hot water extraction. The extracted compounds can then be applied as colorants in textile dyeing operations. In this study, a comparative assessment of four different tree species with regard to their colouristic potential for wool dyeing was performed. Aqueous extracts from alder, ash tree, spruce and oak bark were prepared and analysed for their total phenolic content and ultraviolet (UV) absorption at 360–370 nm. The extracts were used for meta‐mordant dyeing by adding iron sulphate mordant (FeSO4 × 7H2O). For comparison, iron salt‐based dye lakes were prepared and used in dyeing experiments. For each tree species, a specific correlation between the total phenolic content of the dyebath and the colour depth in terms of K/S and CIELab coordinates was observed, both for the aqueous extracts and the dye lakes. Based on this relationship, standardisation and quality control of raw materials and dye lakes can be installed as important stages in the industrialisation of natural colorants from bark. The preparation of concentrated dye lakes permits formation of a concentrated colorant as dye product, which then can be standardised and delivered to textile dyehouses, similar to synthetic dyes. The preparation of dye lakes offers a relevant route towards achieving the commercialisation of bark extracts as natural colorants. Note de contenu : - EXPERIMENTAL : Chemicals - Extract formation and dyeing experiments - Preparation of dye lakes - Analytical procedures
- RESULTS AND DISCUSSION : Direct use of extracts - Formation of lake - Comparison of extracts and dye lakesDOI : 10.1111/cote.12378 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12378 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31663
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible Comparison of madder (Rubia tinctorum L.) and weld (Reseda luteola L.) total extracts and their individual dye compounds with regard to their dyeing behaviour, colour, and stability towards light / Hendra Willemen in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : Comparison of madder (Rubia tinctorum L.) and weld (Reseda luteola L.) total extracts and their individual dye compounds with regard to their dyeing behaviour, colour, and stability towards light Type de document : texte imprimé Auteurs : Hendra Willemen, Auteur ; Geeske J. P. van den Meijdenbert, Auteur ; Teris A. van Beek, Auteur ; Goverdina C. H. Derksen, Auteur Année de publication : 2019 Article en page(s) : p. 40-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Propriétés tinctoriales
Colorimétrie
Couleurs -- Stabilité
Garance et constituants
Jaune
LutéolineLa lutéoline ou lutéolol est un composé chimique de la famille des flavonoïdes, et plus spécifiquement l'une des flavones les plus communes. Elle fut isolée pour la première fois par le chimiste français Michel-Eugène Chevreul à partir de la gaude (autre nom du réséda des teinturiers, une plante utilisée autrefois pour fabriquer de la teinture jaune).
Photostabilité
Rayonnement ultraviolet
Rouge (couleur)Index. décimale : 667.3 Teinture et impression des tissus Résumé : This paper reports on the colorimetric properties of natural dyes from madder and weld plants. For both crops, a comparison is made among several individual dye compounds and the total plant extracts. Dyeing properties, colour properties and colour stability have been studied. Insight has been gained into the role of the major dye compounds present in the plant. For madder as well as for weld, the use of the total plant extract is considered to be advantageous over the use of individual dye compounds in terms of solubility, colour tone and stability towards light, and non-coloured components present in the plant extract are considered to be responsible for increasing the solubility and the stability of the dye compounds. Note de contenu : - EXPERIMENTAL : Materials - Dyeing procedure - Exposure of UV light - Extraction method - Colorimetric measurement
- RESULTS AND DISCUSSION : Dyeing behaviour of extracts vs individual dye compounds - Colour of extracts vs individual dye compoundsDOI : 10.1111/cote.12384 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12384 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31664
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible The application of biosurfactants for scouring wool / Samuel J. Leighs in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : The application of biosurfactants for scouring wool Type de document : texte imprimé Auteurs : Samuel J. Leighs, Auteur ; Steven J. McNeil, Auteur ; Steve L. Ranford, Auteur Année de publication : 2019 Article en page(s) : p. 48-52 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Avoine et constituants
Biosurfactants
Fibres textiles -- Lavage
Laine brute
SaponinesIndex. décimale : 677.3 Fibres animales Résumé : The first investigation of the use of biosurfactants for the scouring of raw wool is reported. A saponin, and a recently developed surface active oat extract, were evaluated at the laboratory scale using a first-to-be-reported benchtop scouring system with simulated flowback. The levels of contaminants remaining on the wool after bioscouring, along with the wool colour, were compared with those of wool that had been laboratory-scoured with a surfactant used in the commercial scouring of raw wool, namely a synthetic nine molar poly(oxyethylene)nonylphenyl (NPEO). Both biosurfactants can be extracted from land-based renewable crops. The saponin proved to be effective, producing low levels of residual contaminants on the wool, and colours that were not statistically different to those of wool scoured with NPEO. The oat extract was considerably less effective than the saponin, both in terms of colour and residual contaminant level. This study demonstrated the significant potential of biosurfactants in the scouring of the global greasy wool clip, which now comprises two billion kg per annum. Note de contenu : - EXPERIMENTAL : Materials - Scouring procedure - Test methods
- RESULTS AND DISCUSSION : Residual grease on wool - Wool ash - Wool colour - Implications of these findingsDOI : 10.1111/cote.12370 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12370 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31665
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible Surface characteristics and dyeing properties of polyimide fabric treated with sodium hydroxide / Gang Bai in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
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Titre : Surface characteristics and dyeing properties of polyimide fabric treated with sodium hydroxide Type de document : texte imprimé Auteurs : Gang Bai, Auteur ; Yanchun Liu, Auteur ; Hong-Fei Qian, Auteur Année de publication : 2019 Article en page(s) : p. 53-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Fibres textiles -- Propriétés tinctoriales
Fibres textiles -- Surfaces
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.
Isotherme d'adsorption
Mesure
Polyimides
Potentiel zeta
Spectroscopie de photoélectrons
Teinture -- Fibres textiles synthétiques
Topographie
Traîtements de surfaceIndex. décimale : 667.3 Teinture et impression des tissus Résumé : A polyimide fabric was treated with sodium hydroxide to improve its dyeing property. The X-ray photoelectron spectroscopy analysis showed that carboxyl groups were introduced onto the fibre surface after an alkali treatment. The mean zeta potentials were 7.19 mV for the original sample and -12.1 mv for the treated sample. The surface morphology measured using atomic force microscopy and scanning electron microscopy indicated the presence of a very rough surface structure for the alkali-treated sample. The alkali-treated sample showed a higher equilibrium exhaustion than the untreated sample did. The adsorption isotherms of the treated fabric followed the Langmuir sorption model. Note de contenu : - EXPERIMENTAL : Materials - Polyimide fabric modification - Dyeing - Measurements
- RESULTS AND DISCUSSIONS : XPS - Zeta potential - Surface topography - XRD - Dyeing propertiesDOI : 10.1111/cote.12364 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12364 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31666
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Titre : Printed thermochromic displays Type de document : texte imprimé Auteurs : Urska Kavcic, Auteur ; Matija Mraovic, Auteur ; Sabina Bracko, Auteur ; Deja Muck, Auteur Année de publication : 2019 Article en page(s) : p. 60-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conduction électrique
Ecran de visualisation
Encre
Encre d'imprimerie
Encre électronique
Equipements électroniques ou électriques (EEE)
Essais (technologie)
Matériaux -- Propriétés électriques
Photostabilité
Stabilité thermique
Thermochromie
VernisIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Thermochromic displays, which were evaluated in this study, combine printed electronics with the thermochromism phenomenon. Conductive lines printed on the reverse side and thermochromic printing ink printed on the front side of cardboard packaging form a thermochromic display that gives cardboard packaging additional value. Displays were printed on different printing materials, and thermochromic printing ink was deposited in one and two layers. In addition, half of the samples were varnished. The influence of the printing material, the thickness of the thermochromic printing ink layer, the varnish, the high temperature, and light fastness on the display's operability were all evaluated. It was clearly shown that the choice of printing material plays a crucial role in the display's operability. Moreover, high temperature and light fastness also have a significant influence, although the impact is negligible when the display is used at room temperature. Note de contenu : - EXPERIMENTAL : Designing conductive lines - Printing - High-temperature stability - Light fastness - Display's operability
- RESULTS AND DISCUSSION : High-temperature stability - Light fastness - Electrical testing - 7-segment displayDOI : 10.1111/cote.12372 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12372 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31667
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible Modification of activated carbon with a silane coupling agent under ultrasonic conditions for the advanced treatment of wastewater with dressing chemicals / Jin Xiao in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : Modification of activated carbon with a silane coupling agent under ultrasonic conditions for the advanced treatment of wastewater with dressing chemicals Type de document : texte imprimé Auteurs : Jin Xiao, Auteur ; Bailie Yu, Auteur ; Jie Yuan, Auteur ; Zhen Yao, Auteur ; Qifan Zhong, Auteur ; Liuyun Zhang, Auteur Année de publication : 2019 Article en page(s) : p. 67-76 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption
Charbon actif
Eaux usées -- Décontamination
Eaux usées -- Epuration
Réaction de couplage
Silanes
UltrasonsIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Fresh activated carbon (FAC) was oxidised by nitric acid and then the silane coupling agent was grafted onto the surface of FAC under ultrasonic conditions to obtain modified activated carbon (MAC). The chemical oxygen demand was used as the main evaluation index in the wastewater. The effects of benzene, aniline, 2-mercaptobenzothiazole and methylene blue on the adsorption mechanism and performance of FAC prior and postmodification were investigated by different adsorption models. All of them fitted the Langmuir monomolecular adsorption model. The adsorption capacity of MAC was 1.07, 1.12, 1.56 and 0.62 times that of FAC, respectively, which had a better adsorption effect on hydrophobic organic compounds. The maximum adsorption capacity increased due to the existence of competitive adsorption in multicomponent absorption. Texture properties of activated carbon were characterised by scanning electron microscopy, Fourier Transform-infrared and Brunauer-Emmett-Teller theory, which show that the surface morphology became spongy, and that Si-O-C and Si-O infrared peaks appeared. In addition to the mesopore volume, the specific surface area, pore volume and micropore volume decreased slightly after the modification. Note de contenu : - EXPERIMENTAL : Materials - Characterisation
- RESULTS AND DISCUSSION : Experimental results for the response surface methodology - Effect of ultrasound on MAC - Adsorption model and mechanism - Regeneration cycle performance - Texture characteristicsDOI : 10.1111/cote.12371 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12371 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31668
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Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible Pretreatment effects on pigment-based textile inkjet printing – colour gamut and crockfastness properties / Yi Ding in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : Pretreatment effects on pigment-based textile inkjet printing – colour gamut and crockfastness properties Type de document : texte imprimé Auteurs : Yi Ding, Auteur ; Renzo Shamey, Auteur ; Lisa Parillo-Chapman, Auteur ; Harold S. Freeman, Auteur Année de publication : 2019 Article en page(s) : p. 77-86 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
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).
Essais dynamiques
Flexion (mécanique)
Impression jet d'encre
Impression sur étoffes
Pigments
Polyesters
Polyéthylène téréphtalate
Résistance au chocs
Spectrométrie de masse à ionisation secondaire
Surfaces -- Analyse
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The application of two commercial pretreatment agents, formulated to improve the performance of a six‐colour nano‐scale pigment ink set during the textile inkjet printing of cotton and polyester (PET) fabrics, was examined. An industrial scale printer, operating at 55 linear m/h and equipped with Kyocera printheads, was used to print on commercial fabrics (180 cm wide) prepared for digital printing. The work employed an industrial scale rather than a benchtop printer to enhance the utility of the results for a commercial environment. The colorimetric attributes of printed fabrics were recorded for the individual inks as well as for spot colour combinations generated using Dr. Wirth RIPMaster v11 software. Colour table profiles were also generated and the colorimetric values of inks were compared. Colour gamuts of inks on cotton and PET, including three‐dimensional volumes in the CIELab space, were examined to assess the role of pretreatment on the colorimetric properties of the printed substrates. It was found that the pretreatments enhanced the ink receptiveness, colour intensity and colour gamut of fabrics. Pretreatment of cotton resulted in a larger gamut and more vivid colours than on PET. However, wet and dry crockfastness results were found to be low. In this regard, Time‐of‐Flight Secondary Ion Mass Spectrometry analysis of fabrics printed in the presence and absence of pretreatment indicated that the low crockfastness arises from higher pigment levels on the surface of the pretreated fabric. Note de contenu : - EXPERIMENTAL : Materials and methods - Colour measurements, profile creation and colour gamut evauation - Crockfastness testing - Surface analysis by time-of-flight secondary ion mass spectrometry
- RESULTS AND DISCUSSION : Colour measurement of individual inks - Colour gamut comparisons - Crockfastness assessment - TOF-SIMS analysisDOI : 10.1111/cote.12377 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12377 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31669
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20582 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |
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