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A colorimetric chemosensor for selective detection of copper ions / Ahran Kim in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 459-467 Titre : A colorimetric chemosensor for selective detection of copper ions Type de document : texte imprimé Auteurs : Ahran Kim, Auteur ; Ju Byeong Chae, Auteur ; Chang Joo Rha, Auteur ; Cheal Kim, Auteur Année de publication : 2020 Article en page(s) : p. 459-467 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques Colorimétrie Ions cuivre Produits chimiques -- Détection Index. décimale : 535.6 Couleur Résumé : A water-applicable hexamethylbenzene (HMB) chemosensor, (E)-2-((2-hydroxy-3-methoxybenzylidene)amino)benzamide, displayed a selective colour change from colourless to yellow in the existence of copper ions. The detection limit was computed as 1.57 µmol/L, which is substantially lower than the World Health Organisation guideline (31.5 µmol/L) for copper ions. Probe HMB could also sense and quantify copper ions in real water samples. The coordination mode of HMB to copper ions was demonstrated through Job plot, electrospray ionisation mass spectroscopy and proton nuclear magnetic resonance titration, and was also supported by theoretical studies. Note de contenu : - MATERIALS AND METHODS : General - Synthesis of the HMB compound HMB ((E)-2-((2-hydroxy-3-methoxybenzylidene)amino)benzamide) - Colorimetric analysis for Cu(II) - Calculations - RESULTS AND DISCUSSION : Colorimetric sensing for Cu(II) - Theoretical calculations DOI : https://doi.org/10.1111/cote.12491 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12491 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34699 [article]

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Colour-texture mapping associations in terms of preference / Ela Fasllija in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 468-475 Titre : Colour-texture mapping associations in terms of preference Type de document : texte imprimé Auteurs : Ela Fasllija, Auteur ; Nilgün Olguntürk, Auteur ; Dilek Güvenç, Auteur Année de publication : 2020 Article en page(s) : p. 468-475 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couleur Etudes comparatives Matériaux -- Texture vision des couleurs Index. décimale : 535.6 Couleur Résumé : Basic design is the origin of many design‐related fields and covers different concepts such as pattern, colour, texture and relief. Because colour is rarely seen as a uniformly plain element, current research embraces colour and texture as equally important variables. Investigations consider the association of colour and texture in terms of preference. One hundred individuals trained in design, as well as 96 individuals not trained in design, participated in an experiment in a virtual and abstract environment. We chose four primary colours from Natural Colour System colour space (yellow, red, green and blue) with the same saturation and brightness values. They were associated with three different texture types (plain, basket and broken twill), which we obtained by scanning the physical textile samples. In the second part of the experiment, we attempted to find a relationship between colour and one texture variable, in this case texture strength. The results of the study do not verify the existence of a dependency between colour and texture in either sample group. Also, there is no verification that a relationship between colour and texture strength exists. Furthermore, the results show that overall blue is the most preferred colour. Moreover, all participants preferred fine textures to coarse ones. Design‐trained participants often associate fine strength level with basket texture whereas the non‐design–trained participants more often associate it with plain textures. Lastly, the majority of participants state that blue is their most preferred colour in fine rather than coarse textures. Note de contenu : - INTRODUCTION : Colour-texture related studies - METHODS : Sample groups - Experimental sets - Colour-mapped sets - The experiments - RESULTS : Colour and texture - Colour and texture strength - Texture-strength preference DOI : https://doi.org/10.1111/cote.12492 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12492 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34700 [article]

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A novel feature-based network with sequential information for textile defect detection / Li Chenxi in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 476-484 Titre : A novel feature-based network with sequential information for textile defect detection Type de document : texte imprimé Auteurs : Li Chenxi, Auteur ; Liu Tao, Auteur ; We Ye, Auteur Année de publication : 2020 Article en page(s) : p. 476-484 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Détection de défauts (Ingénierie) Qualité -- Contrôle Textiles et tissus -- Défauts Index. décimale : 677 Textiles Résumé : In this paper, a novel feature-based attention network with sequential information is proposed for fabric defect detection. As an important part of the textiles industry, fabric quality inspection needs to be automated in the latest wave of intelligent transformation. To this end, fabric defect detection algorithms have been widely studied. In this paper, an efficient defect detection model for fabrics was built. As the appearances of defects change with the type of fabric, manual features which denote the overall situation of the fabric are used as prior knowledge. The feature-based attention module discussed in this paper can generate attention maps from these manual features to rectify the responses of the feature maps according to the whole situation of the input image. Multidirectional long short-term memory networks are implemented to extract context information from continuous defects. When making a judgement, taking sequential information into consideration may reduce the number of unexpected misjudged decisions compared with the number of those made independently pixel by pixel. Both of those two modules can be integrated into any existing convolutional neural network model and trained in an end-to-end manner. A fabric defect dataset is built to train and test the models. In this paper, several models with different architectures are implemented to verify our ideas, and are supported by results confirming the efficiency of the proposed methods. Note de contenu : - THEORY - PROPOSED METHODS : Feature-based attention module - Multidirectional LSTM module - EXPERIMENTAL : Training and testing details - Fig. 1 : Distribution of defects - Fig. 2 : Defects - Fig. 3 : Network structure - Fig. 4 : Feature-based attention module - Fig. 5 : The main part of the long short-term memory (LSTM) branch - Fig. 6 : Defect - Fig. 7 : Mask results - Table 1 : Evaluation metrics - Table 2 : AUC values within the defect categories DOI : https://doi.org/10.1111/cote.12493 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12493 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34701 [article]

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Dyeing properties on polyurethane fibres of novel azo disperse dyes prepared from a four-component Ugi reaction / Huanhuan Li in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 485-491 Titre : Dyeing properties on polyurethane fibres of novel azo disperse dyes prepared from a four-component Ugi reaction Type de document : texte imprimé Auteurs : Huanhuan Li, Auteur ; Gaofeng Feng, Auteur ; Shuaijun Fang, Auteur ; HongFei Qian, Auteur Année de publication : 2020 Article en page(s) : p. 485-491 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Colorants azoïques Colorimétrie Isotherme d'adsorption Orange (couleur) Polyuréthanes Solidité de la couleur Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : A new group of azo disperse dyes prepared by the Ugi four-component reaction were used to dye polyurethane fibres. It was found that all the new dyes showed excellent fastness properties. One of the new dyes was selected to investigate the adsorption properties on polyurethane fibres, including the dyeing rate, adsorption isotherm, surface adsorption state, colour characteristics and colour fastness. The results were compared with those of CI Disperse Orange 3, which has the same parent structure as the new dye. The results indicated that the new dye has a lower dyeing rate and solubility but a higher affinity and adsorption capacity than the conventional dye due to its larger molecular weight and size. In addition, the aggregation of the new dye on the surface of polyurethane fibres occurred at higher concentrations whereas the conventional dyes aggregated at a lower concentration, resulting in lower colour fastness. This demonstrates that these new dyes derived from the Ugi four-component reaction are worth developing further and are of great application value for polyurethane fibres. Note de contenu : - EXPERIMENTAL : Materials - Dyeing procedure - Measurmeent of adsorption isotherms - Observation of the adsorbed state on the surface of the fibres - Colorimetric evaluation - Fastness test - RESULTS AND DISCUSSION : Dyeing rate - Adsorption isotherm - Colorimetric properties - Fastness properties - Table 1 : Colour parameters for dyeings with different concentrations of dye - Table 2 : Fastness testing of the dyes on the PU fibres DOI : https://doi.org/10.1111/cote.12495 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12495 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34702 [article]

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Enforcing Kubelka–Munk constraints for opaque paints / Paul Centore in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 492-502 Titre : Enforcing Kubelka–Munk constraints for opaque paints Type de document : texte imprimé Auteurs : Paul Centore, Auteur Année de publication : 2020 Article en page(s) : p. 492-502 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algorithmes Kubelka-Munk, Théorie de La théorie de Kubelka-Munk (du nom de Paul Kubelka et Franz Munk) décrit les propriétés d'absorption de la lumière et de diffusion de la lumière des systèmes pigmentés, tels que les peintures ou les colorants dans les tissus textiles. La théorie peut prédire à partir de mesures d'épaisseurs à deux couches comment la couleur fonctionne à d'autres épaisseurs de couche. Cela permet aux fabricants de peinture d'estimer combien de pigments ils doivent ajouter à une peinture, de sorte que la peinture est opaque à une certaine épaisseur du travail. Avec l'aide de la théorie, l'effet de couleur du mélange de deux colorants peut être prédit si les paramètres des colorants individuels sont déterminés au moyen de mesures spectroscopiques. Les résultats sont meilleurs que l'utilisation naïve du mélange de couleurs soustractif. Opacité (optique) Revêtements:Peinture Index. décimale : 535.6 Couleur Résumé : The Kubelka-Munk model relates the colours of paint mixtures to the absorption and scattering coefficients (K and S) of the constituent paints, and to their concentrations (C) in the mixtures. All Ks and Ss are non‐negative, and Cs are physically constrained to be between 0 and 1. Standard estimation procedures cast the Kubelka-Munk relationships as an overdetermined linear system and apply ordinary least squares (OLS). OLS, however, sometimes produces coefficients or concentrations that are less than 0 or greater than 1. These physically impossible solutions occur because OLS projects a target vector (such as a desired reflectance spectrum) onto a vector subspace, while in fact the set of physically realisable paint combinations is a convex polytope, which is a subset of that subspace. This paper reformulates Kubelka-Munk estimation problems geometrically, as the problem of finding the point on that polytope which is closest to a target vector. The solutions to the reformulated problem are always physically realisable. If feasible, a worker could solve the reformulated problem with a ready‐made commercial solver. Otherwise, the Gilbert-Johnson-Keerthi algorithm is recommended as particularly suitable for Kubelka-Munk estimation ; this algorithm has been tested on some simple cases and released as open‐source code. Note de contenu : - REFORMULATING CONSTRAINED LEAST SQUARES PROBLEMS : OLS and CLS problems - - KUBELKA-MUNK DERIVATIONS : Linear Kubelka-Munk relationship - Estimating concentrations - Estimating Ks and Ss - COMPARISONS WITH PREVIOUS WORK - SUMMARY : Algorithm setting - Algorithm description DOI : https://doi.org/10.1111/cote.12497 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12497 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34703 [article]

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A study of the diffusion behaviour of reactive dyes in cellulose fibres using confocal Raman microscopy / Binfan Yang in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 503-511 Titre : A study of the diffusion behaviour of reactive dyes in cellulose fibres using confocal Raman microscopy Type de document : texte imprimé Auteurs : Binfan Yang, Auteur ; Yamin Dai, Auteur ; Yi Zhong, Auteur ; Linping Zhang, Auteur ; Hong Xu, Auteur ; Bijia Wang, Auteur ; Xiaofeng Sui, Auteur ; Xueling Feng, Auteur ; Zhize Chen, Auteur ; Zhiping Mao, Auteur Année de publication : 2020 Article en page(s) : p. 503-511 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants réactifs Diffusion (physique) Fibres cellulosiques Microscopie confocale Raman Morphologie (matériaux) Produits chimiques -- Purification Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Confocal Raman microscopy was used as a non-destructive tool for in situ investigation of the diffusion of CI Reactive Blue 194 in viscose fibres. Dyed fibres were analysed by Raman depth imaging along the radius at different dyeing times (30, 60, 90, 120, 150, 180, 240, 300, 600, 900, 1200, 1500, 1800, 2100 and 2400 seconds) and temperatures (30, 40, 50, 60, 70 and 80°C). The dye concentration in the fibre was expressed by normalising the characteristic peak of dyes at 1577 cm−1 to eliminate the interference of the fibre. The Raman depth mapping images showed that dye molecules gradually diffused to the interior of the fibre with an increase in dyeing time, remaining ring-shaped in the state of diffusion. In addition, the diffusion rate increased with increases in the dyeing temperature. This was understandable because dye molecules with a higher kinetic energy move faster. It was also found that the external structure of fibres played a significant role in the diffusion behaviour of CI Reactive Blue 194 during the initial stage of dyeing. The concentration gradient distribution of CI Reactive Blue 194 in the fibre was reflected by Raman depth mapping. The study demonstrates the potential of confocal Raman microscopy for monitoring the dynamic diffusion of dye molecules in fibres. Note de contenu : - EXPERIMENTAL : Dye purification - Preparation of dyed fibres - Confocal Raman microscopy - Scanning electron microscopy - RESULTS AND DISCUSSION : Morphology structure characterisation of viscose fibres - Raman depth mapping of reactive dyes in the viscose fibres - Raman intensity distribution DOI : https://doi.org/10.1111/cote.12503 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12503 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34704 [article]

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A new approach to flame-retardant cellulosic fabrics in an environmentally safe manner in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) Titre : A new approach to flame-retardant cellulosic fabrics in an environmentally safe manner Type de document : texte imprimé Année de publication : 2020 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants réactifs Essais (technologie) Essais de comportement au feu Essais dynamiques Esterification Fibres cellulosiques Phosphore Polymères ignifuges Teinture -- Fibres textiles synthétiques Textiles et tissus -- Lavage Index. décimale : 667.3 Teinture et impression des tissus Résumé : This article investigates reacting potassium salts of phosphorous-containing acids in the presence of urea with cotton cellulose under thermosol conditions (pH 5, 185 °C) to esterify the cellulose and produce a flame-retardant effect. Attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy confirmed chemical modification of the cotton cellulose, where only the phosphite salt formed a covalently bonded cellulose ester (confirmed by flammability tests). Urea plays a vital role; decomposing to ammonia and isocyanic acid (the reactive intermediate) and it is the isocyanic acid/phosphite anion addition compound that reacts with cellulose hydroxyl groups to form the required ester. ATR-FTIR analysis showed that phosphate and hypophosphite salts did not react with cellulose and thus gave no flame-resist effect. Whilst the esterification of cellulose introduces phosphorous onto the cellulose, in order to meet more severe work-wear laundry standards it was necessary to further incorporate a nitrogen species by addition of a cationic polymer. To develop a one shot "all-in" process the possibility of simultaneously bonding nitrogen through carbodimide chemistry is researched, with initial promising trials demonstrated. Many after-treatments of dyed fabrics can cause colour shifts due to interactions with the chromophores. Azo dyes, for example, are particularly susceptible to attack by the formaldehyde produced during the Pyrovatex process or the reducing nature of the Proban process, both resulting in a colour change. An advantage of the novel phosphite/urea flame-retardant system presented herein, is that the system is less aggressive which allows the possibility of using reactive dyes to produce a bright and wide shade range as the results demonstrate. Note de contenu : - EXPERIMENTAL AND METHODS : Materials - Application of flame-retardant composition to fabrics - Dyeing of fabrics - FTIR analysis - Phosphorus analysis - Colour difference analysis - Flammability and wash testing - RESULTS AND DISCUSSION : Esterification of cellulose with various phosphorus acids and their salts - Possible all-in flame retardant procedure incorporating phosphorous and nitrogen - Impact of the novel flame-retardant treatment on coloration DOI : https://doi.org/10.1111/cote.12504 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12504 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34705 [article]

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Understanding dispersion of copper phthalocyanine alpha blue pigment in polyethylene masterbatch with the use of wax / Mert Yücetürk in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 526-534 Titre : Understanding dispersion of copper phthalocyanine alpha blue pigment in polyethylene masterbatch with the use of wax Type de document : texte imprimé Auteurs : Mert Yücetürk, Auteur ; Mehmet Özgür Seydibeyoglu, Auteur Année de publication : 2020 Article en page(s) : p. 526-534 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur) Caractérisation Cires Dispersions et suspensions Essais dynamiques Films plastiques Granulométrie Mélanges-maîtres (chimie) Phtalocyanine de cuivre Pigments inorganiques Polyéthylène Traction (mécanique) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Coloured plastics and polymers are widely used in packaging and consumer goods. Despite their critical roles, there is limited literature on detailed analysis of effective pigment dispersion in polymer matrices for masterbatch applications. In this study, detailed research was conducted on pigment dispersion using different wax materials and their performances in polyethylene masterbatches were compared. During the study, it was first found that the presence of salt crystals plays a critical role in dispersion in one of the tested pigments. Using a laser particle size device, it was shown that homogeneous particle size distribution is another critical parameter for proper pigment distribution. Although filter testing is a common method in industrial applications, there is very limited information in the academic literature. The filter test method was used to examine the effects of different polyethylene waxes on pigment dispersion. The best filter pressure values were obtained in masterbatches made with micronised wax. It was also observed that the improved dispersion increased the mechanical properties of the masterbatch. The masterbatch colours were measured with a sphere spectrophotometer and it was observed that uniform pigment distribution increased the colour strengths. Similar results were also seen in polyethylene films produced by the blown film process. Note de contenu : - EXPERIMENTAL : Materials - Scanning electron microscopy - Pigment particle size analysis - Masterbatch production - Measurement of the quality of dispersion - Preparation of plates - Colour measurement - Tensile test - Preparation of plastic films - RESULTS AND DISCUSSION : Pigment analysis - Masterbatch analysis DOI : https://doi.org/10.1111/cote.12506 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12506 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34706 [article]

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Computational materials design : recent advances and open challenges related to colorimetry / Alain Trémeau in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 535-538 Titre : Computational materials design : recent advances and open challenges related to colorimetry Type de document : texte imprimé Auteurs : Alain Trémeau, Auteur ; Philippe Colantoni, Auteur ; Mathieu Hébert, Auteur Année de publication : 2020 Article en page(s) : p. 535-538 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Conception technique Couleur Innovations Matériaux Réflectance Index. décimale : 535.6 Couleur Résumé : Computational materials design aims at designing, simulating and predicting innovative materials. This paper reviews a few open challenges in the domain of computational materials design related to the colour appearance of materials. These relatively recent fields of research necessitate revisiting the fundamentals of colorimetry, such as reflectance models. First, we address the virtual design and the simulation of innovative materials, which requires modelling their appearance and fundamental properties. Then we discuss the latest advancements in the machine‐learning domain that have highly revolutionised computational and data‐minded methodologies, which are used for the design innovation, discovery and optimisation of materials. Note de contenu : - Use of extended reality for virtual design and simulation of innovative materials - Use of machine learning for the design innovation discovery and optimisation of materials DOI : https://doi.org/10.1111/cote.12498 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12498 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34707 [article]

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