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The roles of elevated temperature and carriers in the dyeing of polyester fibres using disperse dyes : Part 4 plasticisation model of dye diffusion / Stephen M. Burkinshaw in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 667-697 Titre : The roles of elevated temperature and carriers in the dyeing of polyester fibres using disperse dyes : Part 4 plasticisation model of dye diffusion Type de document : texte imprimé Auteurs : Stephen M. Burkinshaw, Auteur Année de publication : 2024 Article en page(s) : p. 667-697 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants dispersés Catégorie 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. Fibres polyesters Hautes températures Plastification Polyéthylène téréphtalate Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : This review concerns the application of disperse dyes to poly(ethylene terephthalate) fibres using aqueous immersion dyeing processes and the roles of both elevated dyeing temperatures and carriers in the dyeing system. In this part of the paper, a novel plasticisation model of dye diffusion is proposed which reflects the crucially important mechanistic role that water-induced fibre/polymer plasticisation adopts in the diffusion of disperse dyes within polyester and other types of polymeric material. Note de contenu : - BACKGROUND - KINETICS OF DYEING - CONVENTIONAL MODELS OF DYE DIFFUSION : - Porous matrix model of dye diffusion - Free volume model of dye diffusion - Relevance to disperse dye/PET fibre system - Water-induced fibre/polymer plasticisation - Fibre/polymer hydrophilicity/hydrophobicity - Significance of similarities/differences between the two models - PLASTICISATION MODEL OF DYE DIFFUSION : - Polymer glass transition/glass transition temperature and water-induced plasticisation - Evidence to support the plasticisation model of dye diffusion - Table 1 : Typical dyeing temperature ranges for various fibres/polymers from DOI : https://doi.org/10.1111/cote.12748 En ligne : https://drive.google.com/file/d/1ABlTvv6uKB_FDMKnSd4Z3FID8T6SVQKg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41466 [article]

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Research on a colour solid built by gridded colour mixing of nine primary-coloured fibres and its neural network colour prediction approach / Xianqiang Sun in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 698-709 Titre : Research on a colour solid built by gridded colour mixing of nine primary-coloured fibres and its neural network colour prediction approach Type de document : texte imprimé Auteurs : Xianqiang Sun, Auteur ; Yuan Xue, Auteur ; Jingli Xue, Auteur ; Guang Jin, Auteur Année de publication : 2024 Article en page(s) : p. 698-709 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Filature Mélange de couleurs Prévision, Théorie de la Réseaux neuronaux (informatique) Spectroscopie de réflectance Textiles et tissus Index. décimale : 667.3 Teinture et impression des tissus Résumé : According to the demand for colour prediction for coloured yarn, two adjacent colours chosen from red (R), yellow (Y), green (G), cyan (C), blue (B) and magenta (M) fibres were combined with fibres of dark grey (O1), medium grey (O2) and light grey (O3), respectively, and then ternary coupling-superposition mixing was performed to acquire a colour solid consisting of three lightnesses, 18 colour mixing units and 18 × (m + 1) × n grid points. An integrated colour mixing with 20% hue gradient and 33.33% saturation gradient was performed to achieve a colour solid containing 360 grid points, then using it as the sample space for the colour prediction model. A total of 360 typical samples were established by the grid points, 213 yarns and fabrics were prepared by the typical sample parameters, and the corresponding reflectance was accessed by a spectrophotometer. Neural network models for predicting reflectance by mixing ratios as well as forecasting mixing ratios by reflectance, were established. The 12 non-grid point parameters were chosen to prepare corresponding yarns and fabrics, and the corresponding reflectance was measured. The predicted and measured values of the neural network model were compared to verify its predictive ability and generalisability. The results showed that when predicting the colour by the mixing ratios, the colour difference between the predicted and measured samples ranged from 1.5 to 3.4, with an average of 2.4; and when forecasting the mixing ratios by the colour, the colour difference ranged from 0.8 to 5.6, with an average of 2.4. Note de contenu : - COLOUR SOLID OF COLOUR MIXING CONSTRUCTED BY NINE PRIMARY-COLOURED FIBRES AND ITS SPINNING PATTERN : - Colour solid built by nine primary-coloured fibres - The principle of spinning coloured yarn by three-channel computer numerical control spinning - CONSTRUCTION OF A FULL COLOUR GAMUT NEURAL NETWORK PREDICTION MODEL - EXPERIMENTAL ANALYSIS : - Preparation of coloured yarn - Preparation of coloured fabric - Acquisition of spectral reflectance - Construction of the neural network algorithm - Table 1 : Comparison of the six predicted and measured colours contained in the mixed samples - Table 2 : Comparison of the six predicted and measured colours contained in the mixed samples DOI : https://doi.org/10.1111/cote.12726 En ligne : https://drive.google.com/file/d/1QWx4TvjEno2E3gMXWtz_md8JPXG1mdtV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41467 [article]

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Dyeing of cotton/acrylic blend fabric in a single-bath-single-stage method using indigo dye / Mohammad Tajul Islam in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 710-718 Titre : Dyeing of cotton/acrylic blend fabric in a single-bath-single-stage method using indigo dye Type de document : texte imprimé Auteurs : Mohammad Tajul Islam, Auteur ; Mohammed Mehedy Alam, Auteur ; Md Aminul Islam, Auteur ; Tanvir Ahmed Riyadh, Auteur Année de publication : 2024 Article en page(s) : p. 710-718 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). Indigo Mélanges de fibres Polyacryliques Résistance à l'éclatement Teinture -- Fibres textiles Textiles et tissus -- Propriétés mécaniques Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, an attempt has been made to dye cotton/acrylic blend fabrics in a single-bath-single-stage method considering today's growing market for such blended products. Yarn-blend cotton/acrylic fabric was produced and dyed at 3% shade using indigo dye in the exhaust method to optimise the dyeing conditions by varying the amount of reducing agent, pH, and dyebath temperature. The colour yield of both the acrylic part and cotton components of the blend was influenced by pH levels. Meanwhile, the temperature played a notable role in determining the colour yield of the acrylic portion. Optimised dyeing conditions were obtained at pH 6 and 120°C for the acrylic part, whereas pH 11 and 90°C temperature were obtained for the cotton part. These conditions involved the use of sodium dithionite (15 g/L) as a reducing agent and sodium hydroxide as an alkali. While the yarn-blend fabrics exhibited a unique shadow dyeing effect, solid dyeing results were achieved with fibre-blend fabrics, underscoring the versatility of this single-bath-single-stage method. To assess the overall dyeing performance, comprehensive evaluations including bursting strength measurements, assessments of fastness to washing, perspiration, and rubbing were conducted, all of which provided valuable insights into the durability and colour retention of the yarn-blend fabrics. This research not only addresses the demand for cotton/acrylic blend fabrics in today's market but also demonstrates an efficient and innovative single-bath-single-stage dyeing approach using indigo dye, which holds promise for the textile industry's future sustainability and product diversity. Note de contenu : - MATERIALS AND METHODS : - Fabric preparation - Optimisation of dyeing parameters - After treatment - Colour yield - Bursting strength test - Fastness properties - RESULTS AND DISCUSSION : - Effects of temperature and pH on colour yield of yarn-blend fabric - Bursting strength test - Colour effects - Fastness tests - Table 1 : Temperature and pH combinations of dyeing of yarn-blend fabric with 3% indigo dye using 15 g/L reducing agent (Hydrose) for 60 min - Table 2 : Fastness properties yarn-blend acrylic/cotton fabric dyed at the optimised conditions at 3% shade (o.w.f.) with indigo dye using 15 g/L reducing agent DOI : https://doi.org/10.1111/cote.12734 En ligne : https://drive.google.com/file/d/1pv45DRaA50pDVzP6NXp_ZktOEN92PaOV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41468 [article]

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Synergistic anti-bacterial activity of imidazole-based azo dyes with polyvinylpyrrolidone-coated silver nanoparticles / Ana Isabel Ribeiro in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 719-727 Titre : Synergistic anti-bacterial activity of imidazole-based azo dyes with polyvinylpyrrolidone-coated silver nanoparticles Type de document : texte imprimé Auteurs : Ana Isabel Ribeiro, Auteur ; Daniela Dantas, Auteur ; Luís Filipe Carvalho, Auteur ; Jorge Padrao, Auteur ; Renata Silva, Auteur ; Fernando Remiao, Auteur ; Eugénia Pinto, Auteur ; Fàtima Cerqueira, Auteur ; Alice Maria Dias, Auteur ; Andrea Zille, Auteur Année de publication : 2024 Article en page(s) : p. 719-727 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Argent Caractérisation Colorants azoïques Evaluation Imidazole L'imidazole (2 tautomères, 1H et 3H) est un composé organique aromatique hétérocyclique. C'est un cycle à cinq atomes contenant trois atomes de carbone et deux atomes d'azote en position 1 et 3. Le doublet électronique libre de l'azote 3 n'entre pas dans l'aromaticité car l'orbitale p est déjà utilisée pour faire une liaison π (donc son doublet est dans une orbitale moléculaire sp2), alors que celui de l'azote 1 y est inclus : il s'hybride sp2 et place son doublet dans une orbitale p pure afin de participer au phénomène de conjugaison. Nanoparticules Polyvinylpyrrolidone Synergie Textiles et tissus Index. décimale : 667.3 Teinture et impression des tissus Résumé : The high demand for novel antimicrobial textiles by the medical, healthcare, hygiene, sportswear, personal protective equipment and filtration sectors has promoted the growth of functional textiles. However, the efficacy of antimicrobial agents against different pathogens is a considerable challenge because of the distinctive mechanisms of action and resistance. The development of novel synergistic antimicrobial dyes may offer numerous opportunities to enhance antimicrobial effectiveness. In this work, a novel imidazole-based azo dye with a p-methoxyphenyl group in the N-1 substituent of the imidazole ring (AzoIz-a), and corresponding amidrazone precursor (AmIz-a), were combined with polyvinylpyrrolidone-coated silver nanoparticles (AgNPs). The molecules, alone and combined with the AgNPs, were characterised by ultraviolet-visible spectrophotometry and zeta potential. Their synergistic effect was assessed against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. The results were compared with a previously reported imidazole-based azo dye and precursor containing a methyl group in the imidazole ring (AmIz-b and AzoIz-b). The results showed interesting antimicrobial properties of the novel AzoIz-a molecules when combined with a very small concentration of AgNPs. The combination showed an additive effect for S. aureus and a synergistic effect for E. coli and P. aeruginosa. Considering the synergistic results, the effective concentration of the AzoIz-a decreased from more than 128 to 16-32 μg.mL−1 by the addition of a small concentration of AgNPs (0.6-1.3 μg.mL−1), which displayed comparable results with the AzoIz-b molecule. Thus, the application of these conjugates in textiles may lead to highly coloured materials with remarkable anti-bacterial properties, which warrant further exploration. Note de contenu : - Materials - Synthesis of the AmIz compounds - Synthesis of the AzoIz compounds (AzoIz-a and AzoIz-b) - AgNPs' redispersion, and preparation of the dispersions containing the AgNPs and the AmIz or AzoIz compounds - Characterisation of the molecules or AgNPs alone and respective combinations - Antimicrobial evaluation and synergism testing DOI : https://doi.org/10.1111/cote.12732 En ligne : https://drive.google.com/file/d/1Bp026vQsh9sbDYNvpYkqvIbu7vcmcNgw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41469 [article]

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Non-allelic recombination interactive genetic algorithms for colour imagery reproduction in colour scheming / Xiaojian Liu in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 728-742 Titre : Non-allelic recombination interactive genetic algorithms for colour imagery reproduction in colour scheming Type de document : texte imprimé Auteurs : Xiaojian Liu, Auteur ; Ming Li, Auteur ; Boqun Xu, Auteur Année de publication : 2024 Article en page(s) : p. 728-742 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algorithmes génétiques Colorimétrie Couleur Imagerie (technique) Index. décimale : 535.6 Couleur Résumé : Using image extracted colours as the colour source for product colour matching is a common design strategy. The process of colour scheme design involves both source colour combination optimisation and continuous variable optimisation. As a commonly used optimising tool, interactive genetic algorithm (IGA) recombines the colours between alleles, that is, the same area in different colour schemes. Two types of invalid schemes are prone to arise during optimisation. The first is the colour duplication in a colour scheme's areas, which are supposed to be painted differently. The second is the unexpected new colours generated through interpolation between alleles. This article proposes a non-allelic IGA (NA-IGA) method, which allows colour recombination among non-alleles, to avoid invalid schemes and improve algorithm efficiency. The crossover, evaluation, and selection operators are redesigned. NA-IGA tries to maintain the features of extracted colours in the colour schemes while taking user preference into consideration. Thus, interaction methods for colour matching optimisation are designed to extend the evaluation mode of traditional IGA, including colour shuffling, continuous fine-tuning, and so forth. An application test is conducted in the rail vehicle's painting design. The comparison experiment with traditional IGA shows that NA-IGA significantly reduces the generation of invalid schemes and significantly improves efficiency and effectiveness of the optimisation. Note de contenu : - LITERATURE REVIEW : - Expression model for image's extracted colours and colour features - Using extracted colours in optimisation - IMPROVED IGA FOR COLOUR IMAGERY REPRODUCTION : - Requirements - IGA strategies - TECHNICAL REALISATION OF NA-IGA : - Colour imagery model - Cross-recombination population renewal strategy to avoid invalid schemes - Expansion of user interaction methods in the fine-tuning stage - NA-IGA PROTOTYPE SYSTEM FOR COLOUR DESIGN - COMPARATIVE EXPERIMENT OF IGA AND NA-IGA - Table 1 : Number of invalid schemes for interactive genetic algorithm (IGA) and non-allelic interactive genetic algorithm (NA-IGA) DOI : https://doi.org/10.1111/cote.12741 En ligne : https://drive.google.com/file/d/1OgnVRcrLhVNEKL6p-6zpq9WI-T0JS0lz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41470 [article]

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Polyethylene terephthalate cap-based bioreactors for combined domestic and dye wastewater treatment / Ahmed Y. Radeef in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 743-756 Titre : Polyethylene terephthalate cap-based bioreactors for combined domestic and dye wastewater treatment Type de document : texte imprimé Auteurs : Ahmed Y. Radeef, Auteur ; Alwalid K. Mohammed, Auteur ; Ali B. Salih, Auteur ; Aya A. Najim, Auteur Année de publication : 2024 Article en page(s) : p. 743-756 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bioréacteurs Bouchons en matières plastiques Demande biochimique en oxygène Eaux usées -- Décontamination Eaux usées -- Teneur en colorants Polyéthylène téréphtalate Index. décimale : 667.2 Colorants et pigments Résumé : In the current study, a sequencing batch reactor (SBR), a sequencing batch biofilm reactor (SBBR) and a moving bed biofilm reactor (MBBR) were designed and used to treat actual samples of combined domestic and dye (Congo red) wastewaters over a 10-hour cycle. A new application of reusing plastic bottle caps in the SBBR and MBBR was examined. In the SBR, maximum chemical oxygen demand (COD) removal of up to 66% ± 3% was achieved after nine cycles of operation. In the SBBR, a rapid increase in COD removal efficiency was observed during the first cycle, with a noticeable improvement in performance in subsequent cycles, eventually reaching a maximum COD removal efficiency of 77% ± 3%. In the MBBR, maximum COD removal of up to 88% ± 3% was achieved after nine cycles of operation. The biodegradation occurred during two phases in the SBR and SBBR, as an anaerobic phase in the first 2 hours and then as an aerobic phase in the last 8 hours of operation; the MBBR operated in the fully saturated aerobic phase for 10 hours. Of the three reactors used, results for the MBBR in the fully aerobic condition by using polyethylene terephthalate caps as a biocarrier, demonstrated the optimum conditions under which to treat and biodegrade Congo red at all concentration in each cycle. The maximum removal efficiency, which equalled 99% ± 1%, was recorded at an optimal concentration of 50 mg/L. Additionally, five kinetic models were proposed to assess microbial growth activity, and the results demonstrated the elimination of toxic effects when using polyethylene terephthalate caps as biocarriers in the MBBR. The laboratory experiments were consistent with the Monod model. Note de contenu : - MATERIALS AND METHODS : - Materials - Methods - Kinetic models for detection the microbial activity - RESULTS AND DISCUSSION : - Biodegradation approval and COD reduction - CR biodegradation - Formation and settling time of bacterial agglomerations - Water reuse and the prospects for the suggested approach - The analysis of microbial activity by kinetic models DOI : https://doi.org/10.1111/cote.12740 En ligne : https://drive.google.com/file/d/1EyAkqRpinI7c2kFcU3WwDHDoPRc7HLPr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41471 [article]

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Photostability of Mannich-type dyed silk fibroin with pyrazolone-containing aromatic primary amine dyes / Qing Guo in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 757-768 Titre : Photostability of Mannich-type dyed silk fibroin with pyrazolone-containing aromatic primary amine dyes Type de document : texte imprimé Auteurs : Qing Guo, Auteur ; Weiguo Chen, Auteur ; Dongming Qi, Auteur ; Pu Gao, Auteur ; Min Wang, Auteur ; Daquan Zhu, Auteur ; Jie Ling, Auteur ; Zhihua Cui, Auteur Année de publication : 2024 Article en page(s) : p. 757-768 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels. On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués. Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3. Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire. D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel. Colorants organiques Composés organiques -- Synthèse Fibroïne de soie Photostabilité Pyrazolone Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Mannich-type dyeing of silk fibroin with aromatic primary amine dyes (APADs) is a novel reactive dyeing method that requires mild conditions and exhibits high selectivity and good wet fastness. However, the primary amine group in the APADs significantly decreases the photostability of Mannich-type dyed silk fabrics. To reveal the structure–activity relationship and photofading mechanism of the APADs by Mannich-type dyeing, six pyrazolone-containing APADs with similar structures were designed and synthesised. Variation in amino electron density among the dye analogues was related to differences in colour fixation of the Mannich-dyed fabrics, as determined from the calculated Mulliken charge densities. Using mass spectrometry to monitor the photodecomposition of the dyed silk, it is demonstrated that the Mannich-type dyed silk fabrics undergo photooxidative fading, in contrast to the conventional acidic-type dyed fabrics that undergo photoreductive fading. Furthermore, it is shown that the Mannich-type dyed silk fabric has a higher light fastness than conventional acidic-type dyed fabrics using the same pyrazolone-containing APADs. Evaluation of dye dipole moment and Mannich-type dyeing shows that the APADs with increased dipole moments generally demonstrated increased light fastness. Note de contenu : - MATERIALS AND METHODS - Materials and apparatus - Synthesis of D1–D6 - Dyeing method - Colour yield - Dye uptake - Colour fixation - Colour fastness - Collection and test of photodegradation products on the silk - Formaldehyde residue of dyed fabric - Density functional theory (DFT) study - RESULTS AND DISCUSSION - Possible tautomerism in pyrazolone-containing APADs - Spectral properties of pyrazolone-containing APADs D1–D6 - Mannich-type dyeing colour fixation for D1–D6 - Photofading mechanisms for acidic-type or Mannich-type dyed fabrics - Washing fastness and rubbing fastness - Light fastness - Formaldehyde residues in dyed silk fabrics DOI : https://doi.org/10.1111/cote.12743 En ligne : https://drive.google.com/file/d/1hVPMA_rbDCLlDs6rekVEzywvH2EywTrt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41472 [article]

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Synthesis and characterization of iron oxides and their application as inorganic pigments in white paint / Milena Z. Lemos in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 769-781 Titre : Synthesis and characterization of iron oxides and their application as inorganic pigments in white paint Type de document : texte imprimé Auteurs : Milena Z. Lemos, Auteur ; Silvia Jaerger, Auteur ; Nayara Balaba, Auteur ; Dienifer F. L. Horsth, Auteur ; Juan C. Villalba, Auteur ; Felipe L. Stefenon, Auteur ; Pedro P. González-Borrero, Auteur ; Fauze J. Anaissi, Auteur Année de publication : 2024 Article en page(s) : p. 769-781 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Oxyde de fer Pigments -- Synthèse Pigments inorganiques Pigments inorganiques -- Analyse Revêtements -- Coloration:Peinture -- Coloration Index. décimale : 667.6 Peintures Résumé : The tones of iron oxide pigments range from yellow, red, brown and green to black. Iron oxide pigments are non-toxic and have a nanometric particle size, which makes them ideal for use as pigments. The current study synthesised synthetic inorganic pigments based on iron oxides using the alkaline precipitation method. This approach to the synthesis of iron oxide pigments makes them less expensive for obtaining reproducible colours. Iron salts (iron (III) chloride, iron (III) nitrate, iron (II) sulphate [ferrous sulphate] and iron (III) sulphate) have been combined with alkaline solutions (sodium hydroxide, potassium hydroxide and ammonium hydroxide) to form coloured iron oxides, which are widely known as natural inorganic pigments. The 12 samples produced in four different colours (red, yellow, brown and black) were left in aqueous suspension and dispersed in commercial real white estate paint, to evaluate their behaviour as pigments. Structural characterisation (X-ray diffractometry), composition (X-ray fluorescence by dispersive energy), thermal analysis (i.e. thermogravimetric analysis and the differential thermal analysis) and spectroscopy (FTIR and photoacoustic), as well as colorimetry, were performed. The phases indexed by X-ray diffractometry were goethite, haematite, magnetite and lepidocrocite. The inorganic pigments produced are compatible with natural inorganic pigments. They also showed dispersion compatibility in commercial white paint without changing the surface coating powder and are therefore an alternative to synthetic inorganic pigments. Note de contenu : - EXPERIMENTAL : - Reagents - Preparation of iron oxides - Pigment dispersion in commercial paint - Stability test - Characterisation techniques - RESULTS AND DISCUSSION : - X-ray diffractometry - Fourier Transform–infrared spectroscopy - Scanning electron microscopy - Chemical analysis (EDXRF) - Thermal analysis - Photoacoustic spectroscopy - Colorimetry (CIELab) and photostability test DOI : https://doi.org/10.1111/cote.12735 En ligne : https://drive.google.com/file/d/1lNvIvkGKUx31ozEAwvH4DJnEa3poWIAE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41473 [article]

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Fabric colour measurement in the small region of CIELab colour space using a scanner-based subtractive clustering fuzzy inference system / Elham Hasanlou in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 782-792 Titre : Fabric colour measurement in the small region of CIELab colour space using a scanner-based subtractive clustering fuzzy inference system Type de document : texte imprimé Auteurs : Elham Hasanlou, Auteur ; Ali Shams Nateri, Auteur ; Hossein Izadan, Auteur Année de publication : 2024 Article en page(s) : p. 782-792 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Lecteurs optiques Textiles et tissus Index. décimale : 667.3 Teinture et impression des tissus Résumé : Digital devices are increasingly being used in the colour measurement of textile-made materials. Proper scanner characterisation is crucial for accurate and consistent colour measurement. In the present study a fuzzy inference system based on subtractive clustering, called FIS_SC method, for the colorimetric characterisation of a scanner to measure the colour of the fabrics in a small region of a colour space is proposed. The results of the proposed method for 16 colour sets were obtained and compared with the results of the scanner characterisation using polynomial regression and neural network method. It was shown that the FIS_SC method successfully characterised the scanner in the small colour space, so that its mean of the colour difference was lower than the polynomial regression and neural network methods in almost all colour sets. Note de contenu : - INTRODUCTION : - Fuzzy subtractive clustering - MATERIALS AND METHODS : - Preparation of the coloured textile fabrics - Scanner setup - Scanner characterisation using polynomial regression - Scanner characterisation using neural network - Scanner characterisation using fuzzy subtractive clustering - RESULTS AND DISCUSSION : - Comparison of the characterisation methods - Evaluation of the interval plot DOI : https://doi.org/10.1111/cote.12739 En ligne : https://drive.google.com/file/d/1ELINjlYv-d2wo9SV2hJZPWMoTmxGp5Oq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41474 [article]

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Analysing the impact of paper grammage and pulp blend on electrophotographic printing systems / Sinan Sonmez in COLORATION TECHNOLOGY, Vol. 140, N° 5 (10/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 5 (10/2024) . - p. 793-804 Titre : Analysing the impact of paper grammage and pulp blend on electrophotographic printing systems Type de document : texte imprimé Auteurs : Sinan Sonmez, Auteur ; Merve Engin, Auteur ; Kecheng Li, Auteur ; Abdus Salam, Auteur Année de publication : 2024 Article en page(s) : p. 793-804 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Evaluation Fibres Impression numérique Impression sur papier Pâte à papier Index. décimale : 667.3 Teinture et impression des tissus Résumé : The effect of fibre length and grammage on the electrophotographic digital printing process was investigated in this study. While integral optical density values on handsheets have shown no significant change, unprinted handsheets have shown an increasing change as short fibre content has increased. Because of structural changes in the paper surface, the measured results for print chroma, brightness, contrast, and delta gloss differed between paper groups. This research confirmed that these changes have nothing to do with grammage or fibre length content. Regardless of the fibre length ratios, significant increases in tone values of ink, were accompanied by a decrease in the grammage of the handsheets among the grammage groups provided. The specimen grammage affected the universal colour diagrams, but not the fibre length. The discrepancies in all of these printing outcomes were thought to be caused by the random distribution of fibres and the distances between them on the paper's surface. Note de contenu : - MATERIALS AND METHODS : - Raw material and pulp evaluation - Handsheet making process - Evaluation of structural characteristics of handsheets - Printing process of handsheets and evaluation of print properties - RESULTS : - Evaluation of fibre and pulp properties - Evaluation of handsheet properties DOI : https://doi.org/10.1111/cote.12738 En ligne : https://drive.google.com/file/d/1yK0ltjjd5LFbuPXCfpMl-nduon_auh4L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41475 [article]

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