Biosorption of Malachite Green dye by the brown alga Dictyota cervicornis : Kinetics and isotherm study / Mozhgan Panahi in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 292-298 Titre : Biosorption of Malachite Green dye by the brown alga Dictyota cervicornis : Kinetics and isotherm study Type de document : texte imprimé Auteurs : Mozhgan Panahi, Auteur ; Sanaz Behnam, Auteur Année de publication : 2018 Article en page(s) : p. 292-298 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biosorption Colorants -- Adsorption Extraction (chimie) Isotherme d'adsorption Malachite La malachite est une espèce minérale du groupe des carbonates minéraux et du sous-groupe des carbonates anhydres avec anions étrangers de formule Cu2CO3(OH)2. pH Vert Index. décimale : 667.3 Teinture et impression des tissus Résumé : Malachite Green (MG) dye was removed from aqueous solutions by the brown alga Dictyota cervicornis. The effects of initial solution pH (3, 4, 5, 6, 7, 9 and 11), contact time, initial dye concentration (5, 25, 50, 75, 100 and 125 mg l−1) and biomass concentration (0.2, 0.6, 1.0 and 1.4 g l−1) on MG adsorption were studied. The highest adsorption capacity was observed at pH 9. Biosorption kinetics were described by the pseudo‐second order model. The Langmuir model predicted the maximum adsorption capacity occurring at a relatively high value of 230 mg g−1. The chemical modification of functional groups, potentiometric titration, Fourier Transform–infrared (FTIR) analysis of the biomass before and after biosorption, and ICP analysis of the solution after MG adsorption, were also performed. The quantities of strong, weak and very weak acidic sites obtained by potentiometric titration were 1.23, 0.88 and 0.29 meq g−1 of dry biomass, respectively, with a total acidity equal to 2.4 meq g−1. FTIR spectra of the pristine biomass showed the presence of carboxylic, sulphonic, hydroxyl and amine functional groups on the biomass structure. There were no obvious differences in the spectra of the biomass before and after MG adsorption. Chemical modification of the functional groups did not affect biosorption. Therefore, MG was removed via a physical mechanism. K(I), Ca(II), Na(I) and Mg(II) ions were released into the solution upon MG adsorption. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the algal biomass - Biosorption expriments - Determination of pH at the point of zero charge - Modification of functional groups and lipid extraction - FTIR spectroscopy - Potentiometric titration - ICP analysis - RESULTS AND DISCUSSION : The pHzpc and effect of pH on biosorption - Biosorption kinetics - Effects of adsorbent concentration - Adsorption isotherms - Chemical modification of the biomass - FTIR analysis - Potentiometric titration - ICP analysis DOI : 10.1111/cote.12341 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12341 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30924 [article]

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Colour tolerance for liquid coatings / Chiara Battaglia in SURFACE COATINGS INTERNATIONAL, Vol. 103.4 (07-08/2020)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 103.4 (07-08/2020) . - p. 204-207 Titre : Colour tolerance for liquid coatings Type de document : texte imprimé Auteurs : Chiara Battaglia, Auteur ; Long Lin, Auteur Année de publication : 2020 Article en page(s) : p. 204-207 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Evaluation Formulation (Génie chimique) Mesure Revêtements organiques Rouge (couleur) Vert vision des couleurs Index. décimale : 667.9 Revêtements et enduits Résumé : Ensuring colour consistency between the standard and a batch is a fundamental task in coloured goods manufacturing, which is achieved through the colour matching evaluation. For this purpose, the determination of acceptable tolerances is essential to allow a clear and accurate colour communication and to avoid customer complaints. The study reported in this paper attempted to identify a reliable method to define colour tolerance limits. One of the limits of every colour representation model is that a Euclidean global colour space cannot be uniform at the saure time in terms of both hue and chroma differences. Additionally, a tolerance measure based only on the AE value does not take into account that this difference could be due to variations along a single or multiple coordinates at once'. As a consequence, there is, by necessity, an unsatisfactory correlation between instrumental (AE) and visual (AV) tolerances. The most accurate representation of the limits of colour perception in the CIE colour space has the shape of an ellipsoid, defined as: "the standard deviation of the boundaries around a colour target (centre point of the ellipsoids) on the CIE colour space, where all the colours within are indistinguishable to the average human eye". Note de contenu : - MATERIALS - METHODOLOGY : Instrumental measurements - Visual assessment - RESULTS AND DISCUSSION : Visual and instrumental data correlation - Fig. 1 : Tolerance ellipsoids in the CIELab colour space - Fig. 2 : Colour variations of the green low chroma centre along the axis of the colour space - Fig. 3 : Colour variations of the bright orange chroma centre along the axis of the colour space - Table 1 : Pigments content of the standards - Table 2 : Green batches formulations (percentage by weight of the coating sample) - Table 3 : Orange batches formulations (percentage by weight of the coating sample) En ligne : https://drive.google.com/file/d/1n163Y6uANDRwjzvcDGcGTppKqlk5NTQE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34429 [article]

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Green synthesis of reactive dye for ink-jet printing in COLORATION TECHNOLOGY, Vol. 136, N° 2 (04/2020)

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 2 (04/2020) . - p. 110-119 Titre : Green synthesis of reactive dye for ink-jet printing Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 110-119 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chauffage Chloropyrimidine Colorants -- Synthèse Colorants réactifs Encre Impression sur étoffes Micro-ondes Photostabilité Résistance au lavage Vert Index. décimale : 667.3 Teinture et impression des tissus Résumé : Chloropyrimidine-based reactive dyes are reported as well suited to textile printing; however, nucleophilic aromatic substitution of chloropyrimidines with amino-containing chromophores is slow and often suffers from poor yields. In this study, a novel and simple method was developed for the synthesis of chloropyrimidine-based reactive dye under microwave irradiation. In addition, the dye was also synthesised by conventional heating for comparison, which took both the reaction time and yield into account. The progress of the synthesis reactions concerned were monitored using capillary electrophoresis and the purity of the dye obtained was assessed by thin-layer chromatography. The structure of the synthesised trichloropyrimidine dye was confirmed by Fourier Transform–infrared spectroscopy and elemental analysis. It was found that the reaction rate of the nucleophilic aromatic substitution carried out under microwave irradiation was 4-fold faster than that carried out under conventional heating, although the enhancement in product yield was modest. These results suggest that microwave irradiation is an effective technique for the synthesis of chloropyrimidine-based reactive dyes. The synthesised chloropyrimidine dye was formulated into an ink and applied onto a wool fabric by ink-jet printing. The printed fabrics were steamed at 102°C for 5-25 minutes at 5-minute intervals. Good K/S and rate of dye fixation were obtained, both of which improved with increasing steaming time. The prints obtained exhibited reasonably good light and wash fastness properties. Note de contenu : - EXPERIMENTAL : Materials - Methods and instrumentation - Synthesis of yello 7-[(4-amino-2-methylphenyl)azo]-1,3-naphthalenedisulphonic acid dye (chromophore) - Synthesis of yello 7-[2,5,6-trichloro-4-pyrimidinyl)amino]-2-[(methylphenyl)azo]-1,3-naphthalenedisulphonic-acid dye - Ink-jet printing procedure - Measurement of K/S - Measurement of dye fixation - Colour fastness testing - RESULTS AND DISCUSSION : Microwave irradiation versus conventional heating - Characterisation of yellow chromophore and dye 1 via microwave irradiated synthesis - Printing properties - Table 1 : Comparison of reaction time and yield using microwave irradiation and conventional heating DOI : https://doi.org/10.1111/cote.12450 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34230 [article]

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Investigating the in-solution photodegradation pathway of diamond green G by chromatography and mass spectrometry / Francesca Sabatini in COLORATION TECHNOLOGY, Vol. 137, N° 5 (10/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 5 (10/2021) . - p. 456-467 Titre : Investigating the in-solution photodegradation pathway of diamond green G by chromatography and mass spectrometry Type de document : texte imprimé Auteurs : Francesca Sabatini, Auteur ; Ilaria Degano, Auteur ; Maarten van Bommel, Auteur Année de publication : 2021 Article en page(s) : p. 456-467 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse qualitative (chimie) Analyse quantitative (chimie) Caractérisation Colorants Diméthylsulfoxyde Eau Photodétérioration Solutions (chimie) Teinture -- Fibres textiles Vert Index. décimale : 667.3 Teinture et impression des tissus Résumé : Diamond Green G (CI 42040, Basic Green 1) is a triarylmethane dye mostly employed in the industrial dyeing of miscellaneous natural and artificial textile fibres, in the production of printing inks and as an anti-fungal agent for aquaculture products. Diamond Green (DG) tends to fade under light irradiation, similar to several other dyes and pigments belonging to the triarylmethane family. In this paper, an in-solution degradation study was carried out to shed light on DG photostability. The experiments were performed by artificially irradiating DG in water and dimethyl sulphoxide, and analysing aliquots sampled at different time intervals by ultra-high performance liquid chromatography coupled with diode array detector quadrupole and time of flight tandem mass spectrometry. The degradation products formed were characterised and the product-ion spectra discussed and interpreted. On the basis of the structure of the identified compounds and their kinetic trend in relation to the accelerated ageing time, degradation mechanisms were proposed for DG, taking into account the role played by the solvent. Finally, the dyeing formulation of an historical textile sample, collected from a stage costume worn in a Zeffirelli lyric opera, was determined utilising the information collected from the analysis of irradiated DG solutions. Note de contenu : - MATERIALS AND METHODS : Chemicals - Photo-ageing in-solution experiment - Historical sample - Apparatus - RESULTS AND DISCUSSION : In-solution study : qualitative analysis - In-solution study : semi-quantitative analysis - Analysis of an historical textile sample DOI : https://doi.org/10.1111/cote.12538 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12538 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36489 [article]

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Investigation into the development of novel lanthanide-based luminescent colorants for application to textiles and paper materials / David M. Lewis in COLORATION TECHNOLOGY, Vol. 139, N° 5 (10/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 5 (10/2023) . - p. 610-620 Titre : Investigation into the development of novel lanthanide-based luminescent colorants for application to textiles and paper materials Type de document : texte imprimé Auteurs : David M. Lewis, Auteur ; Peter J. Broadbent, Auteur ; M. L. A. Rigout, Auteur ; C. M. Carr, Auteur ; C. C. Seaton, Auteur ; T. Swift, Auteur Année de publication : 2023 Article en page(s) : p. 610-620 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur) Colorants -- Synthèse Impression jet d'encre Impression sur étoffes Impression sur papier Luminescence Luminophores Métaux des terres rares Rouge (couleur) Structure chimique Vert Index. décimale : 667.3 Teinture et impression des tissus Résumé : This article describes the synthesis and application of lanthanide-based luminophores for visualisation under short wavelength ultraviolet (UV) activation (typically 254 nm). Luminophores are chemical compounds which re-emit light of longer wavelength than typical fluorescence and phosphorescence, following photoexcitation, because of efficient energy transfer from the ligands to the lanthanide ion emission levels. The luminophores described in this article are all derived from europium and terbium metal complexes and cover the complete colour gamut. Selection of appropriate ligands allows for water solubility or water insolubility (if required pigment or disperse “dye” applications). Similar to dyeing or printing processes, the anionic complexes can be applied to polyamide fibres or to cellulosic fibres, whereas dispersions of the non-ionic complexes are suitable for polyester or cellulose acetate fibre application. The water-soluble derivatives are also suitable for ink-jet printing and the water-insoluble derivatives are suitable for lithographic or intaglio paper printing. The novel complexes are excited by radiation below 300 nm and thus cannot be activated by sunlight (the earth's atmosphere prevents light below about 300 nm reaching the surface). Accordingly, the photo-stability of the dyed materials and prints obtained is excellent. These materials could be used in security marking applications, for example bank-notes and passports, where they could replace the current fluorophores that are rendered visible under near UV light (typically 365 nm) illumination but exhibit relatively poor photo-stability. The development of an RGB (red, green and blue) colour palette for inkjet printing based on these innovative luminophores will significantly support the design of digitally printed security features. Note de contenu : - EXPERIMENTAL : Materials - Long-liquor application methods - Ink-jet printing with water-soluble luminophores - K-Bar imaging and offset printing - Luminescence viewing - Light-fastness assessment - Chemical structure analysis - RESULTS AND DISCUSSION : Preparation of red water-soluble europium complex luminophores - Preparation of water-soluble green terbium(III) complex luminophores - Preparation of blue water-soluble europium(III) complex luminophores - Synthesis of water insoluble red luminophore pigment - Synthesis of water insoluble green luminophore pigment - Synthesis of water insoluble blue luminophore pigment - Structures of luminophores - Application of luminophores to textile substrates - Paper printing DOI : https://doi.org/10.1111/cote.12675 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12675 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39839 [article]

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NC thinners and finishes : Formulation / Mukund Hulyalkar in PAINTINDIA, Vol. LXX, N° 9 (09/2020)  

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A novel 1,8-naphthalimide green fluorescent dye and its corresponding intrinsically fluorescent polyurethane latexes / Qingjun Jin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 3 (05/2017)  

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Stoving enamel - 10 / Mukund Hulyalkar in PAINTINDIA, Vol. LXVII, N° 5 (05/2017)  

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Undercover influences / Werner Rudolf Cramer in EUROPEAN COATINGS JOURNAL (ECJ), N° 5 (05/2017)  

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