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Textile dyes and human health : a systematic and citation network analysis review / Alan Y. L. Tang in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 245-257 Titre : Textile dyes and human health : a systematic and citation network analysis review Type de document : texte imprimé Auteurs : Alan Y. L. Tang, Auteur ; Chris K. Y. Lo, Auteur ; Chi-Wai Kan, Auteur Année de publication : 2018 Article en page(s) : p. 245-257 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Toxicologie Publications scientifiques Recherche Statistiques Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : This study reviewed 155 journal articles that examined the adverse effects of textile dyes on human health. The distribution of these articles was investigated in terms of journal type, year of publication, methodologies and research contexts. Based on the use of citation network analysis, an objective approach for identifying clusters of articles in the literature, three major research domains of textile dyes on human health issues were found, dermatological effect, toxicological effect and respiratory effect. Further investigation was done by conducting a Main Path Analysis of the articles to draw a map of knowledge structure within each research domain. Finally, future research opportunities and directions were proposed for each research domain from a human health perspective. Note de contenu : - EXPERIMENTAL - DESCRIPTIVES STATISTICS : Distribution of articles by journal - Distribution of articles by year of publication - Distribution of articles by country - Distribution of article type - Methodologies used in empirical studies - research context in empirical studies - Implications for research opportunities - CLASSIFICATION OF RESEARCH DOMAINS - MAIN PATH ANALYSIS OF THE MAJOR RESEARCH DOMAINS : Dermatological effects - Toxicological effects - Respiratory effects - FUTURE RESEARCH RECOMMENDATIONS AND DIRECTIONS DOI : 10.1111/cote.12331 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12331 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30918 [article]

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Comparison of computer colour matching of water-based and solvent-based reverse micellar dyeing of cotton fibre / Alan Y. L. Tang in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 258-265 Titre : Comparison of computer colour matching of water-based and solvent-based reverse micellar dyeing of cotton fibre Type de document : texte imprimé Auteurs : Alan Y. L. Tang, Auteur ; Yanming Wang, Auteur ; Cheng Hao Lee ; Chi-Wai Kan Année de publication : 2018 Article en page(s) : p. 258-265 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs 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). Etalonnage Etudes comparatives Heptane Micelles Réflectance Solutions (chimie) Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, cotton fabrics were dyed with reactive dyes in conventional water‐based and solvent‐based reverse micellar dyeing systems. In solvent‐based dyeing, heptane replaced water as the medium. Three commercially available reactive dyes with the primary colours of red, blue and yellow were used. Dyeing with different dye concentrations was conducted to establish calibration dyeing databases for computer colour matching (CCM). Colours produced by mixing known concentrations of primary colours were used as standard samples for CCM. Different colour difference formulae were used for predicting dye concentrations in the standard samples from CCM. Results revealed that the predicted concentrations were statistically related to the known concentrations for both dyeing methods. This indicates that the solvent‐based reverse micellar dyeing method can achieve colour matching as good as the conventional water‐based dyeing system, and that a large amount of water can be saved. Note de contenu : - EXPERIMENTAL : Preparation of cotton fabric - Dyeing of cotton fabric in water to prepare the calibration curve - Dyeing of cotton fabric in the heptane-based reverse micellar dyeing system to prepare the calibration curve - Establishment of calibration curves - Prediction of dye recipe with different colour difference formulae - RESULTS AND DISCUSSION : Reflectance values of the dyed samples - Calibration curves - CCM DOI : 10.1111/cote.12333 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12333 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30919 [article]

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Dyeing of silk fabric with natural dye from camphor (Cinnamomum camphora) plant leaf extract / Asfandyar Khan in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 266-270 Titre : Dyeing of silk fabric with natural dye from camphor (Cinnamomum camphora) plant leaf extract Type de document : texte imprimé Auteurs : Asfandyar Khan, Auteur ; Muhammad Tahir Hussain, Auteur ; Huiyu Jiang Année de publication : 2018 Article en page(s) : p. 266-270 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants végétaux Essais (technologie) Extraction (chimie) Mordançage (teinture) pH Soie et constituants Solidité de la couleur Teinture -- Fibres textiles Textiles et tissus -- Propriétés mécaniques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Natural dye extracted from the leaves of camphor (Cinnamomum camphora) was applied to silk fabric, with and without metallic salt mordants, using the exhaust dyeing method. Three techniques, meta‐mordanting, post‐mordanting and pre‐mordanting, were employed, using potash alum, ferrous sulphate and zinc sulphate as mordants. Dyed silk fabric was analysed for K/S, CIE L*a*b* values, and colourfastness performance to washing, light and crocking. Optimal results were obtained for dyeing at 90 °C for 60 min at pH 4. A yellowish shade was observed when silk fabric was dyed without mordants, and a variety of pale to dark reddish colour shades were achieved with the trio of mordants; ferrous sulphate produced the dullest and darkest shades. Colourfastness to washing was fair to good, colourfastness to light was poor to fair, and colourfastness to crocking was good to excellent. Note de contenu : - EXPERIMENTAL : Materials - Instruments - Extraction, dyeing and mordanting - Testing - RESULTS AND DISCUSSION : Effect of dyeing conditions and mordanting techniques on KS/ and CIE L*a*b* values - Effect of dyeing conditions and mordanting techniques on colourfastness and tensile strength - Tables : 1. Effect of dyeing pH on colourfastness and tensile strength - 2. Effect of dyeing temperature on colourfastness - 3. Effect of mordanting techniques DOI : 10.1111/cote.12338 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12338 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30920 [article]

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The structural formation of closely packed colloidal crystals on fibre and the effect of fibre surface functionality on crystalline structure / Kasumasa Hirogaki in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 271-274 Titre : The structural formation of closely packed colloidal crystals on fibre and the effect of fibre surface functionality on crystalline structure Type de document : texte imprimé Auteurs : Kasumasa Hirogaki, Auteur ; Daichi Nakamura, Auteur ; Kazushi Sekiguchi ; Tomohiro Satake ; Isao Tabata Année de publication : 2018 Article en page(s) : p. 271-274 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aminopropyltriethoxysilane Colloides Cristaux Dip-coating Fibres textiles synthétiques Polyesters Sol-gel, Procédé Technique des plasmas Traîtements de surface Index. décimale : 667.3 Teinture et impression des tissus Résumé : The effect of hydrophilicity and the charge of the fibre surface upon the formation of colloidal crystals on the fibre was investigated. Surface‐modified polyester fibre was prepared either by oxygen plasma treatment or with a sol‐gel method using 3‐aminopropyltriethoxysilane (APS). The surface‐modified polyester fibre was dip‐coated with 20 wt.% water suspension of uniform‐sized silica particles with a diameter of 300 nm and then it was dried. Hexagonal and square arrangements were observed for the particles deposited on the fibre surface by scanning electron microscopy (SEM). The crystallinity of deposited particles was estimated with the number ratio of arranged particles to all particles in the SEM image. On the plasma‐treated fibre, the crystallinity of deposited particles was 82% and the ratio of hexagonal arrangement to square arrangement was 3:1. On the APS‐treated fibre, crystallinity was 56% and the ratio was 1:8. The fibre‐fabricated colloidal crystal exhibited red colour on its surface and it had a peak wavelength of 637 nm in the reflection spectrum. Note de contenu : - Materials - Surface modification of fibre - Dip-coating of colloidal particles on the fibre surface - Analyses - Table : Receding water contact angle and concentration of elements on the fibre surface - Fig. 1 : SEM images of surface-modified polyester fibres with deposit of colloidal particles : untreated, APS-treated, and oxygen plasma-irradiated - Fig. 2 : Enlarged SEM mage of deposited particles on the fibre surface - Fig. 3 : Crystallinity of colloidal particles deposited on the fibre surface - Fig. 4 : Reflection spectrum of polyester fibre-fabricated colloidal crystal on its surface DOI : 10.1111/cote.12349 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12349 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30921 [article]

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Visual sensibility evaluation of Korean traditional indigo-dyed lyocell fabrics / Eugene Lee in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 275-283 Titre : Visual sensibility evaluation of Korean traditional indigo-dyed lyocell fabrics Type de document : texte imprimé Auteurs : Eugene Lee, Auteur ; Inhwan Kim, Auteur ; Gilsoo Cho Année de publication : 2018 Article en page(s) : p. 275-283 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Analyse des données Colorants végétaux Colorimétrie Consommateurs -- Préférences Evaluation visuelle Fibres cellulosiques Indigo Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Eco‐friendly dyeing technology with regard to manufactured fibres is receiving considerable attention, while textile coloration requires highly advanced interdisciplinary approaches including textile science, dyeing chemistry, consumer sensibility and cultural aspects. In this study, lyocell fabrics were dyed with the traditional Korean indigo dyestuff, Niram, and their psychological colour sensibility was measured and discussed in relation to the physical colour properties in the context of global culture. A systematic dyeing process was developed to obtain a variety of colours utilising different dyestuff concentrations, reducing agent concentration and construction of fabrics. According to participants’ responses to a questionnaire, all lyocell fabrics dyed with traditional Korean indigo dyestuffs were visually perceived and recognised as ‘cold’, ‘clean’, ‘plain’, ‘elegant’ and ‘exotic’. Psychological colour sensibility showed statistically significant correlation with the concentrations of dye and reducing agent. In the situation where fabrics were dyed under high dye concentration and darker/bluish colour properties, the subjects had an ‘exotic’ and ‘western’ appearance rather than ‘oriental’ and ‘banal’. According to the results of ANOVA and Duncan's multiple range tests, two dyeing conditions, and dye concentration in particular, had a significant impact on all psychological colour sensibilities except for warm‐cold’. Reducing agent concentration significantly affected ‘warm‐cold’, while ‘vivid‐subdued’ was affected by two‐way interaction effects between dye concentration and reducing agent concentration. Traditional Korean indigo dyestuff concentration and reducing agent concentration can be adjusted appropriately and controlled for efficient vat dye to produce and design diverse combinations of psychological colour sensibilities. Note de contenu : - EXPERIMENTAL : Materials - Dyebath solution - Dyeing lyocell with indigo dyestuff - Physical colour measurement - Psychological sensibility evaluation - Data analysis - RESULTS AND DISCUSSION : Physical colour properties of the dyed fabrics - Psychological sensibility evaluation - Psychological colour sensibility in relation to physical colour property DOI : 10.1111/cote.12347 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12347 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30922 [article]

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Microwave-assisted preparation of pyrite and its sensitisation of titanium dioxide in self-cleaning aramid fabrics / Chenghui Zheng in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 284-291 Titre : Microwave-assisted preparation of pyrite and its sensitisation of titanium dioxide in self-cleaning aramid fabrics Type de document : texte imprimé Auteurs : Chenghui Zheng, Auteur ; Chang-E Zhou, Auteur ; Zhenming Qi ; Qingqing Zhou ; Chaoxia Wang Année de publication : 2018 Article en page(s) : p. 284-291 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Angle de contact Bleu de méthylène Caractérisation Colorants -- Détérioration Dioxyde de titane Dispersions et suspensions Fibre aramide Micro-ondes Photocatalyse Photodétérioration Pyrite La pyrite est une espèce minérale composée de disulfure de fer (FeS2), polymorphe de la marcassite ; elle peut contenir des traces de nickel (Ni), cobalt (Co), arsenic (As), cuivre (Cu), zinc (Zn), argent (Ag), or (Au), thallium (Tl), sélénium (Se) et vanadium (V). Résistance au rayonnement ultraviolet Textiles et tissus auto-nettoyants Textiles et tissus synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Titanium dioxide (TiO2) dispersions were obtained by neutralising anatase nano‐titanium dioxide sols prepared by hydrolysing tetrabutyl titanate in acidic aqueous media. Pyrite was initially prepared via the microwave‐assisted method with a mixed solvent of ethylene glycol and small amounts of water, and was then used in sensitising micron‐sized titanium dioxide particles to obtain aramid fabrics with self‐cleaning properties. X‐ray diffraction demonstrated the crystalline structure of pyrite, and ultraviolet‐visible (UV‐vis) spectrum and energy‐dispersive X‐ray spectroscopy characterised the band gaps, surface status on fabrics and the distribution of the pyrite compound's titanium dioxide particles. The contact angle, UV protection factor (UPF) and photocatalytic degradation of methylene blue (MB) were used to evaluate the performance of treated aramid fabrics. Results show that pyrite‐sensitised titanium dioxide compounds obtained at pH 5 have smaller band gap energies and relatively poor wetting abilities, higher UPF values, and perform well in the photocatalytic degradation of MB. The pseudo‐first kinetic model was used to analyse elaborate sections of the curve for the degradation of MB. Note de contenu : - EXPERIMENTAL : Materials - Preparation of titanium dioxide dispersions - Preparation of pyrite - Treatment of aramid fabrics - Characterisation - RESULTS AND DISCUSSION : X-ray diffraction - UV-vis diffuse spectra - EDS analysis - UPF - Contact angles - Photocatalytic degradation of MB - Tables : 1. Contact angles of water droplets on aramid fabrics - 2. Pseudo-first kinetic parameters and half-life of the photocatalytic degradation of MB DOI : 10.1111/cote.12348 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12348 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30923 [article]

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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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Synthesis of a low-temperature self-crosslinking polyacrylate binder with a core-shell structure and its application in textile pigment printing / Xiaoyu Zhang in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 299-307 Titre : Synthesis of a low-temperature self-crosslinking polyacrylate binder with a core-shell structure and its application in textile pigment printing Type de document : texte imprimé Auteurs : Xiaoyu Zhang, Auteur ; Yi Zhong, Auteur ; Xiaofen Sui ; Hong Xu ; Lingpin Zhang ; Zhiping Mao Année de publication : 2018 Article en page(s) : p. 299-307 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Auto-réticulation Basses températures Calorimétrie Composés organiques -- Synthèse Core-Shell Couches minces -- Propriétés mécaniques Essais dynamiques Fourier, Spectroscopie infrarouge à transformée de Impression sur étoffes Latex Liants Méthacrylate d'acétoacétoxyéthyle Microscopie électronique en transmission Polyacrylates Polymérisation en émulsion Thermogravimétrie Index. décimale : 667.3 Teinture et impression des tissus Résumé : A core‐shell acrylate binder for pigment printing containing acetoacetoxyethyl methacrylate (AAEM) in its shell was synthesised via semicontinuous seeded emulsion polymerisation. Self‐crosslinking occurs when curing at low temperatures without releasing formaldehyde. The core‐shell structure of the binder produces prints with a high block resistance and good film‐forming properties, which can avoid clogging the screens during the printing process and help to acquire a soft handle for textiles. Transmission electron microscopy (TEM) analysis demonstrated that the latex particle had a core‐shell structure of size ca. 120 nm. Differential scanning calorimetry (DSC) testing showed that polyacrylate (PA)‐modified AAEM exhibited two apparent Tg, providing further information about the formation of the soft core‐hard shell latex particles. Crosslinking degree tests, thermogravimetric analysis (TGA) and testing of the mechanical properties indicated that self‐crosslinking of AAEM took place at 100 °C, thereby enhancing the thermostability and mechanical properties of the latex films. The softer and non‐stick handle, excellent rubbing fastness, and higher K/S were obtained by further padding the printed fabric with amino silicon softener. The chemical structures of the surfaces of the printed fabrics were studied by Fourier Transform‐infrared (FTIR), and results confirmed that the crosslinking reaction between the amino of the softener and remaining acetoacetoxy functional group (AcAc) of AAEM had taken place. Note de contenu : - EXPERIMENTAL : Chemicals - Materials - Equipment - Synthesis of core-shell latex - Preparation of latex films - Preparation of latex film - Pigment printing - Measurement and analysis - RESULTS AND DISCUSSION : Polymerisation - Morphology - Thermal analysis - Mechanical properties - Pigment printing - After treatment DOI : 10.1111/cote.12339 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12339 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30925 [article]

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Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66 / Mousa Sadeghi-Kiakhani in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 4 (08/2018) . - p. 308-314 Titre : Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66 Type de document : texte imprimé Auteurs : Mousa Sadeghi-Kiakhani, Auteur ; Siyamak Safapour, Auteur ; Somayeh Mirnezhad Année de publication : 2018 Article en page(s) : p. 308-314 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cinétique chimique Cochenilles Coefficient de diffusion Un coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick. Colorants -- Adsorption Énergie d'activation L'énergie d'activation est la quantité d'énergie nécessaire pour lancer un processus chimique, le plus souvent une réaction. En effet, pour démarrer un processus, on doit souvent faire face à une barrière énergétique (c’est-à-dire apporter un minimum d'énergie pour le démarrage). Cette quantité est exprimée, selon le système international d'unités, en kJ/mol (kilojoules par mole de réactif). Polyamide 66 Teinture -- Fibres textiles synthétiques Thermochimie Index. décimale : 667.3 Teinture et impression des tissus Résumé : The adsorption behaviour of the natural dye cochineal on polyamide 66 was studied at different pH values. The thermodynamic and kinetic parameters such as standard affinity (−Δμ˚), changes in enthalpy (ΔH˚) and entropy (ΔS˚), diffusion coefficient and activation energy of the diffusion, were determined for pH values of 3 and 6. Results indicated that the experimental data fitted appropriately with the Nernst isotherm. Furthermore, the partitioning ratio and −Δμ˚ decreased significantly with increasing temperature, and it was revealed that the adsorption of cochineal onto polyamide was an exothermic process. The −Δμ˚ value of polyamide dyed at pH 3 was higher than that dyed at pH 6. This is related to higher numbers of electrostatic and non‐electrostatic interactions between cochineal and polyamide at pH 3, whereas at pH 6 non‐electrostatic hydrophobic interactions between cochineal and polyamide are dominant. At pH 6 comparatively higher negative values for ΔH˚ and ΔS˚ were obtained. The diffusion coefficient increased with rises in temperature. The polyamide dyed at pH 3 had a higher diffusion coefficient at every temperature than the polyamide dyed at pH 6. The dyeing rate for polyamide at pH 3 was higher than at pH 6 and reached equilibrium in a shorter time. Furthermore, a lower activation energy of diffusion was obtained at pH 3 compared to pH 6. Note de contenu : - EXPERIMENTAL : Materials and methods - Adsorption experiment - Diffusion coefficient - Activation energy - RESULTS AND DISCUSSION : Dyeing equilibrium - Adsorption kinetics DOI : 10.1111/cote.12342 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12342 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30926 [article]

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