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Colour management system : Monte Carlo implementation for camouflage pattern generation / Wojciech Przybyl in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 407-416 Titre : Colour management system : Monte Carlo implementation for camouflage pattern generation Type de document : texte imprimé Auteurs : Wojciech Przybyl, Auteur ; Wojciech Radosz, Auteur ; Adam Januszko, Auteur Année de publication : 2020 Article en page(s) : p. 407-416 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Camouflage (science militaire) Couleur Monte-Carlo, Méthode de Probabilités Statistique Index. décimale : 535.6 Couleur Résumé : The Monte Carlo method provides a simple yet powerful and flexible tool for simulation of complex or random systems. This paper contains an overview of the theory behind the method and some simple examples to illustrate its implementation to model the refinement of patterns on the camouflaged surface. The objective is to provide an introduction to the method and to present a useful tool for solving practical problems. The first attempts of its application for military camouflage pattern generation are presented. A colour management system utilising the Monte Carlo method and based on the imaging and spectral data enabled the design of a dedicated camouflage pattern for both small‐ and large‐size military objects. Note de contenu : - 1. INTRODUCTION : Camouflage patterns - 2. METHODOLOGY : Statistical method - Probabilistic method - 3. IMPLEMENTATION : Colour management system - 4. APPLICATION DOI : https://doi.org/10.1111/cote.12483 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12483 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34484 [article]

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Optimisation of organic solvent-pH buffer solutions to improve the photochromic performance of plant-derived 3-deoxyanthocyanidin dye / Kumiko Tasaki in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 417-426 Titre : Optimisation of organic solvent-pH buffer solutions to improve the photochromic performance of plant-derived 3-deoxyanthocyanidin dye Type de document : texte imprimé Auteurs : Kumiko Tasaki, Auteur ; Yoshiumi Kohno, Auteur ; Masashi Shibata, Auteur Année de publication : 2020 Article en page(s) : p. 417-426 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 3-désoxyanthocyanidine Les 3-désoxyanthocyanidines et leurs hétérosides, les 3-désoxyanthocyanines (3-DA) sont une sous-famille des anthocyanidines, partageant le même squelette de base, mais ne possédant pas de groupe hydroxyle sur le carbone. Les 3-désoxyanthocyanidines sont des anthocyanidines jaunes qu'on trouve principalement dans des fougères et des mousses1, dans le sorgho commun et dans le maïs violet (maíz morado). (Wikipedia) Colorants photochromiques Colorants végétaux Décoloration Essais (technologie) Mélanges (chimie) Solvants organiques Sorgho et constituants Index. décimale : 667.2 Colorants et pigments Résumé : Plant‐derived 3‐deoxyanthocyanidins are photochromic materials that are coloured under ultraviolet (UV) irradiation and decoloured under light‐shielded storage. In this study, the optimised solvent composition is investigated to enhance the photochromic performance of luteolinidin, a 3‐deoxyanthocyanidin derivative. The visible absorbance ratio between the solution after UV irradiation and after storage in the dark, an index of photochromic performance, was found to be affected by the pH of the solution, and the value reached a maximum when the pH of the solution was 5.7. The type of organic solvent, which is necessary to dissolve luteolinidin, also affected the photochromic performance. When diethylene glycol or dipropylene glycol was used, the value of the absorbance ratio was especially large. Furthermore, this optimised solvent composition displayed excellent photochromic properties with an extract from the sorghum grain shell containing a large amount of 3‐deoxyanthocyanins. Note de contenu : - EXPERIMENTAL : Materials - Photochromic performance tests - Examination of luteolinidin solution - RESULTS AND DISCUSSION : Solubility of luteolinidin and the possibility of homogeneous mixing with an aqueous pH buffer and organic solvent - Relationship between pH buffer and photochromism of luteolinidin - Relationship between organic solvents and photochromic performance - Analysis of the decolouring process using various organic solvents - Photochromism of sorghum extract solutions with various organic solvents DOI : https://doi.org/10.1111/cote.12484 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12484 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34485 [article]

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Coloration of cellulose nanofibres with pigments / Shamshad Ali in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 427-434 Titre : Coloration of cellulose nanofibres with pigments Type de document : texte imprimé Auteurs : Shamshad Ali, Auteur ; Awais Khatri, Auteur ; Urooj Baig, Auteur ; Alishba Javeed, Auteur ; Nadir Ali Rind, Auteur Année de publication : 2020 Article en page(s) : p. 427-434 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorimétrie Eaux usées -- Analyse Electrofilature Essais (technologie) Fibres cellulosiques Fibres textiles -- Propriétés mécaniques Morphologie (matériaux) Nanofibres Pigments Résistance au lavage Solidité de la couleur Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Electrospun nanofibrous mats are popular for their wide technological applications as medical, filtration, sensing and high performance textiles. The potential for coloration of electrospun nanofibrous mats for aesthetic purposes has also been explored recently, and the pigment coloration of cellulose electrospun nanofibrous mats is reported for the first time in this paper. Cellulose acetate electrospun nanofibrous mats were fabricated using electrospinning followed by treatment with sodium hydroxide to synthesise regenerated cellulose electrospun nanofibrous mats. Then the cellulose mats were coloured with commercially available pigments by a pad‐dry‐bake method. Excellent K/S and colour fastness to both washing and light were produced with the application of three commercial pigments. The pH and total dissolved solids content of the coloration wastewater, as well as the mechanical properties of the electrospun nanofibrous mats, were also tested. Attenuated total reflection‐Fourier Transform infrared spectroscopy and scanning electron microscopy analysis were used for characterisation. Note de contenu : - EXPERIMENTAL : Materials - Preparation of CEL ENMs - Pigment coloration of CEL ENMs - Colour measurement and testing - Wastewater testing - Characterisation - Mechanical properties of ENMs - RESULTS AND DISCUSSION : Chemical structures of CA and CEL ENMs - Effect of bakint temperature on K/S - Effect of baking time on K/S - Effect of pigment quantity on K/S - Effect of pigment quantity on the colorimetric values of coloured CEL ENMs - Analysis of wastewater testing - Colour fastness properties - Surface morphology of ENMs - Mechanical properties of ENMs DOI : https://doi.org/10.1111/cote.12485 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12485 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34486 [article]

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Polycaprolactone primers with zinc oxide and silicon dioxide nanoparticles for paper substrates : Influence on the properties of cyan and magenta offset prints / Tomislav Hudika in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 435-449 Titre : Polycaprolactone primers with zinc oxide and silicon dioxide nanoparticles for paper substrates : Influence on the properties of cyan and magenta offset prints Type de document : texte imprimé Auteurs : Tomislav Hudika, Auteur ; Tamara Tomasegovic, Auteur ; Tomislav Cigula, Auteur ; Marija Prsa, Auteur Année de publication : 2020 Article en page(s) : p. 435-449 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Brillance (optique) Colorimétrie Cyan Le cyan est, par définition, la couleur primaire complémentaire du rouge, dans la synthèse soustractive des couleurs utilisée en photographie argentique en couleurs et en imprimerie. Dioxyde de silicium Magenta Le magenta est un colorant rouge violacé d'aniline de synthèse inventé en 1858, appelé fuchsine ou roséine. C'est aussi la désignation normalisée du colorant primaire absorbant le vert dans la synthèse soustractive des couleurs en imprimerie et en photographie argentique. Nanoparticules Offset (imprimerie) Oxyde de zinc Papier Papier -- Propriétés mécaniques Papier enduit Poly-e-caprolactone Primaire (revêtement) Résistance à l'abrasion Résistance à la traction Index. décimale : 667.2 Colorants et pigments Résumé : In this research study, the applicability of polycaprolactone‐silicon dioxide and polycaprolactone‐zinc oxide coatings used as primers on papers for offset printing, was analysed. Polycaprolactone nanocomposites with different concentrations of nanoparticles were prepared and coated onto three types of papers: uncoated, low‐coated and gloss. The main aim was to analyse the influence of the nanoparticle concentration in primer on the optical and colorimetric properties of cyan and magenta offset printed samples. To further evaluate the applicability of the primers, the tensile strength of primed samples and their surface properties were analysed. Results show that prepared primers are primarily applicable on uncoated and low coated papers. Both nanoparticles in specific concentrations increased gloss values for printed samples on low‐coated paper, and the addition of both types of nanoparticles increased the rub resistance of printed samples. Furthermore, for each type of nanoparticle, the optimal concentration at which the colour deviation on print was minimised could be defined. Adding nanoparticles to primers did not significantly improve mottling on cyan‐printed samples. However, by increasing the concentration of nanoparticles in the primer by up to 1%, the mottling on magenta‐printed samples decreased. Note de contenu : - EXPERIMENTAL : Materials and preparation of samples - Methods of measurement and analysis - RESULTS AND DISCUSSION : Tensile strength - Surface properties and adhesion parameters in the paper-primer-ink system - Rub resistance - Gloss - Smoothness of primed papers - Colorimetric properties of printed samples - Mottling DOI : https://doi.org/10.1111/cote.12487 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12487 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34487 [article]

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Colorimetric detection of Mn(ii) based on a mixture of an anionic pyridylazo dye and a cationic polyelectrolyte in aqueous solution / Yasumasa Fukushima in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 450-456 Titre : Colorimetric detection of Mn(ii) based on a mixture of an anionic pyridylazo dye and a cationic polyelectrolyte in aqueous solution Type de document : texte imprimé Auteurs : Yasumasa Fukushima, Auteur ; Shunichi Aikawa, Auteur Année de publication : 2020 Article en page(s) : p. 450-456 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteurs chimiques Colorants organiques Colorimétrie Mélanges (chimie) Polyélectrolytes Solutions aqueuses (chimie) Index. décimale : 667.2 Colorants et pigments Résumé : We have developed a simple and valuable method for the construction of a colorimetric chemosensor for detecting Mn(ii) in aqueous media. The chemosensor was prepared by mixing two commercial products, an anionic organic dye, 2‐(5‐nitro‐2‐pyridylazo)‐5‐(N‐propyl‐N‐sulphopropylamino)phenol (Nitro‐PAPS) and a cationic polyelectrolyte, poly(diallyldimethylammonium chloride) (PDADMAC). Upon gradual addition of Mn(ii) to the chemosensor, the absorption spectra showed a remarkable bathochromic shift concomitantly with a distinct colour change from yellow to blue‐green, while Nitro‐PAPS alone could not detect Mn(ii) in a colorimetric method. PDADMAC played a key role in sensing Mn(ii) for the mixture. The colour change might be due to the formation of the aggregate obtained through electrostatic interactions of a Nitro‐PAPS‐based Mn(ii) complex with PDADMAC. This investigation can inform the development of a new chemosensor by the combination of an anionic dye and a cationic polyelectrolyte. DOI : https://doi.org/10.1111/cote.12489 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12489 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34488 [article]

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