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A method to improve the performance of wide dye concentration measurement based on the multi-pathlength spectrophotometry / Venkatesh Bairabathina in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 329-341 Titre : A method to improve the performance of wide dye concentration measurement based on the multi-pathlength spectrophotometry Type de document : texte imprimé Auteurs : Venkatesh Bairabathina, Auteur ; Kubera Sampath Kumar Shanmugam, Auteur ; Govardhana Rao Chilukoti, Auteur ; Vijetha Ponnam, Auteur ; Gobinath Raju, Auteur ; Prakash Chidambaram, Auteur Année de publication : 2022 Article en page(s) : p. 329-341 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie 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). Eau -- Consommation -- Réduction Fibres végétales Hydrolyse Micelles Produits chimiques -- Consommation -- Réduction Spectrophotométrie Surfactants Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : This study reviews the need and importance of non-aqueous dyeing systems in the chemical processing industry, especially using the reverse micellar system in the dyeing of natural fibres. When it comes to conventional dyeing systems, which use large quantities of water, chemical, and energy, cause a lot of effluent load to the environment. Again the effluent water has to be treated well to eliminate all the harmful substances in it. To overcome the issues, a lot of research has been carried out in this area to minimise the use of water and chemicals in the dyeing process. Like use of low material to liquor ratio (M:L) in dyeing, dyes with high fixation at lower temperatures, low/salt less dyeing in case of reactive dyeing with cotton, cottonseed oil dyeing, microwave-assisted dyeing, and use of supercritical carbon dioxide in case of polyester dyeing and many more. All the above said methods are aqueous-based and, after the completion of dyeing, results in wastewater generation, which requires further treatment to reduce the harmful chemicals. Therefore, to further minimise the use of water and chemicals in the dyeing of natural fibres reverse micellar system has been introduced with the help of surfactants of both Ionic and nonionic in nature. As of today, a lot of work has been carried out in the dyeing of natural fibres with this system by employing ionic, nonionic, and mixed surfactants. Fascinating results were obtained in the dyeing with good levelness, high exhaustion, and fixation values, and results were compared with conventional dyeing. Computer colour matching studies were also done better to understand the applicability of these systems in the industry and found nearer results. Note de contenu : - Nonionic reverse micellar system - Use of co-surfactant in nonionic reverse micellar system - Mixed reverse micellar systems - Rate of hydrolysis of dye in reverse micellar system - Computer colour matching studies - Advantages and disadvantages of different reverse micellar systems - Table 1 : Different reverse micellar systems employed in dyeing of textiles for natural fibres DOI : https://doi.org/10.1111/cote.12640 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12640 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37885 [article]

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Ethylene glycol diglycidyl ether applied to crosslinking dyeing of cotton fabric with madder dye / Xiaoyu Cai in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 342-354 Titre : Ethylene glycol diglycidyl ether applied to crosslinking dyeing of cotton fabric with madder dye Type de document : texte imprimé Auteurs : Xiaoyu Cai, Auteur ; Hong Li, Auteur ; Li Zhang, Auteur ; Jun Yan, Auteur Année de publication : 2022 Article en page(s) : p. 342-354 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants végétaux 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). Ether diglycidylique d'éthylène glycol Fibres végétales Garance et constituants Mordançage (teinture) Photostabilité Résistance à l'usure Réticulants Solidité de la couleur Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Cotton fabric dyed with natural madder dye exhibits poor dyeing properties. Although mordant improves the dyeing property of cotton fabric, it changes the madder dye colour tonality (the hue angle). In this study, ethylene glycol diglycidyl ether (EGDE) was used as a crosslinking agent to dye cotton fabrics with natural madder dye and improve the surface colour depth (K/S) and colour fastness. The molecular structure, crystal structure and surface morphology of crosslinked dyed cotton were analysed using Fourier Transform–infrared spectroscopy, X-ray diffractometry and scanning electron microscopy, respectively. The results showed that crosslinked dyed cotton fabric had two different ether bonds, and that crosslinked dyeing mainly occurred in the amorphous area. Compared with direct dyed cotton fabric, the hue angle (h°) of crosslinked dyed cotton fabric did not undergo an obvious change, K/S increased by 5, and the rubbing fastness, washing fastness and light fastness increased by 2-3 levels, indicating that the dyeing property of cotton fabric with natural madder dye could be improved by using EGDE as a crosslinking agent. Compared with raw cotton fabric, the bending length of crosslinked dyed cotton fabric was reduced by 2.28 cm, the wrinkle recovery angle increased by 80.7° and the ultraviolet protection factor value was more than 40, indicating that crosslinked dyed cotton fabric had great softness, wrinkle resistance and excellent ultraviolet resistance. In addition, the water contact angle of the cotton fabric only changed slightly after crosslinking dyeing, and the crosslinked dyed cotton fabric still had good hydrophilicity. Therefore, EGDE was a viable crosslinking agent for cotton fabric with madder dye. Note de contenu : - EXPERIMENTAL : Materials - Dyeing process - Determination of epoxy value - Chemical and colour characteristics - Colour fastness - Wearing property - RESULTS AND DISCUSSION : UV-vis spectra analysis - Analysis of epoxy value - FTIR analysis - XRD analysis - SEM analysis - Colour appearance analysis of cotton - Wearing analysis of cotton fabric - Table 1 : Alizarin structures and dye solution digital images at different pH values - Table 2 : Epoxy values of the samples - Table 3 : Fitting data and crystallinity of the cotton fabrics - Table 4 : Colour characteristics, K/S values and digital images of direct, mordant and crosslinked dyed cotton fabrics - Table 5 : Colour fastness of direct, mordant and crosslinked dyed cotton fabrics - Table 6 : Wearing property of the raw, direct, mordant and crosslinked dyed cotton fabrics - Table 7 : Ultraviolet (UV) resistance of the cotton fabrics DOI : https://doi.org/10.1111/cote.12593 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12593 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37886 [article]

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Utilisation of Tectona grandis (teak) leaf extracts as natural hair dyes / Natthawadee Tibkawin in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 355-367 Titre : Utilisation of Tectona grandis (teak) leaf extracts as natural hair dyes Type de document : texte imprimé Auteurs : Natthawadee Tibkawin, Auteur ; Nungruthai Suphrom, Auteur ; Nitra Nuengchamnong, Auteur ; Nantaka Khorana, Auteur ; Pensri Charoensit, Auteur Année de publication : 2022 Article en page(s) : p. 355-367 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anthraquinone Caractérisation Cheveux -- Teinture Colorants -- Solubilité Colorants végétaux Extraction (chimie) Extraits de plantes Flavonoïdes Ingrédients cosmétiques Plantes tinctoriales Stabilité chimique Teck et constituants Index. décimale : 668.5 Parfums et cosmétiques Résumé : There is now a preference for hair dye products containing natural dyes because they are safer for human use. Teak leaves contain flavonoids, anthraquinones and naphthoquinones, and their extracts can be used as natural dyes. The objective of this research was to evaluate the use of teak leaf extracts as natural hair dyes. This research was carried out on both young and mature teak leaves that were extracted either with water or with ethanol-water mixtures using the decoction method. The colour substances in the extracts were studied by quantifying the flavonoid and anthraquinone content, and identified using liquid chromatography-mass spectrometry (LC-MS); the colour values were measured with the CIELab system. The solubility, stability and hair dyeing efficacy of the extracts were assessed. The results showed that young leaf extract is redder with a higher total flavonoid content than mature leaf extract. Fifty percent ethanol was the best solvent for extracting the high flavonoids from teak leaves. Polysorbate 20 significantly increased the water solubility of both young and mature leaf extracts. Hair dyed with young leaf extract became reddish brown, while hair dyed with mature leaf extract became brown. Stability testing found some flavonoid degradation of the extracts, but only slight colour changes occurred in the extracts. The LC-MS profiles showed high-intensity flavonoid peaks that could be applied to control the colour quality of the extracts with other parameters. These results demonstrate that teak leaf extracts are effective natural hair dyes that can be used in the development of hair dye products. Note de contenu : - EXPERIMENTAL : Materials - Plant extraction - Characterisation of teak leaf extracts - Dyeing ability of teak leaf extracts - RESULTS AND DISCUSSION : Effect of leaf maturity and extraction solvent on the quantitative colour substances of teak leaf extracts - Identified colour substances of teak leaf extracts - Solubility of teak leaf extracts - Stability of teak leaf extracts - Dyeing ability of teak leaf extracts - Table 1 : Effects of leaf maturity and extraction solvent on the colour substances associated with the colour properties of teak leaf extracts - Table 2 : Effect of type and concentration of solubiliser on the solubility in water of young and mature teak leaf extracts - Table 3 : Stability of young and mature teak leaf extracts - Table 4 : Colour of hair dyed with young and mature teak leaf the extracts at a concentration of 75 g/L and dyeing time of 60 minutes DOI : https://doi.org/10.1111/cote.12594 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12594 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37887 [article]

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Investigation of the effect of laser technology on the colouring and patterning possibilities in polyacrylonitrile socks / Riza Atav in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 368-377 Titre : Investigation of the effect of laser technology on the colouring and patterning possibilities in polyacrylonitrile socks Type de document : texte imprimé Auteurs : Riza Atav, Auteur ; Sevda Köksal Daban, Auteur ; Erdogan Cetin, Auteur Année de publication : 2022 Article en page(s) : p. 368-377 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chaussettes Lasers -- Applications industrielles Polyacrylonitrile Résistance chimique Rouge (couleur) Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of the current study was to determine the effect of laser treatment on basic dye uptake and the fastness values of acrylic socks. To achieve this, laser treatments were applied to acrylic socks at different resolutions (10, 20 and 30 dpi) over various pixel times (80, 100 and 120 µs) before dyeing. To support the findings obtained, tests and analyses, such as Yellowness Index, Fourier Transform–infrared analysis, scanning electron microscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, and bursting strength, were also applied to untreated and treated fabric samples. It was found that treatment with laser did not have a significant effect on the basic dye uptake of fibres; nevertheless, the samples treated with laser were dyed slightly lighter than the untreated sample. Furthermore, it was determined that the samples treated at 30 dpi started to melt and the fabric was damaged considerably, but the fabrics treated at 10 and 20 dpi were not affected at all. Another result obtained regarding the use of laser technology in acrylic socks is that if some areas of acrylic socks are not treated with laser, while some other areas are treated with laser at 20 dpi for 100 µs, it is possible to obtain patterns containing two different shades of the same colour on the socks. Note de contenu : - MATERIALS AND METHODS : Effect of laser treatment on the dyeability of polyacrylonitrile socks with basic dyes - Obtaining patterns on basic dyed polyacrylonitrile socks with laser - Tests and analysis - RESULTS AND DISCUSSION : Results regarding the effect of laser treatment on the dyeability of polyacrylonitrile socks with basic dyes - Results related to obtaining patterns on basic dyed polyacrylonitrile socks with laser - Table 1 : Factors and levels used in laser treatments - Table 2 : Yellowness Index values of laser-treated fabric samples - Table 3 : Scanning electron microscopy photographs of untreated and laser-treated polyacrylonitrile samples - Table 4 : Scanning electron microscopy with energy dispersive X-ray spectroscopy results of untreated and laser-treated acrylic fibres - Table 5 : Analysis of variance results for K/S obtained as a result of dyeing untreated and laser-treated fabric samples with Astrazon Red FBL dye - Table 6 : Washing and rubbing fastness values of untreated and laser-treated fabric samples dyed with Astrazon Red FBL - Table 7 : Acidic and alkali perspiration fastness values of untreated and laser-treated fabric samples dyed with Astrazon Red FBL DOI : https://doi.org/10.1111/cote.12596 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12596 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37889 [article]

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Preparation of cationic viscose and its salt-free dyeing using reactive dye / Yue Li in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 378-387 Titre : Preparation of cationic viscose and its salt-free dyeing using reactive dye Type de document : texte imprimé Auteurs : Yue Li, Auteur ; Shixiong Zhai, Auteur ; Weiwei Dong, Auteur ; Chengjian Yao, Auteur ; Zhuizhui Fan, Auteur ; Kaili Jin, Auteur ; Hong Zhao, Auteur ; Mengting Wang, Auteur ; Zaisheng Cai, Auteur Année de publication : 2022 Article en page(s) : p. 378-387 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ammoniums quaternaires Caractérisation Colorants réactifs Essais dynamiques Hydroxyde de sodium L'hydroxyde de sodium, appelé également soude caustique7, est un corps chimique composé minéral de formule chimique NaOH, qui est à température ambiante un solide ionique. Fusible vers 318 °C, il se présente généralement sous forme de pastilles, de paillettes ou de billes blanches ou d'aspect translucide, corrosives et très hygroscopiques. Il est très soluble dans l'eau et légèrement soluble dans l'éthanol. La solution d'hydroxyde de sodium, souvent appelée soude, est une solution aqueuse transparente. Concentrée, elle est corrosive et souvent appelée lessive de soude. Les propriétés chimiques de l'hydroxyde de sodium sont surtout liées à l'ion hydroxyde HO- qui est une base forte. En outre, l'hydroxyde de sodium réagit avec le dioxyde de carbone (CO2) de l'air et se carbonate. La solubilité de la soude caustique dans l'eau augmente avec la température, à pression constante ou ambiante. Résistance à l'abrasion Teinture -- Fibres textiles synthétiques Teinture sans sels Température Viscose Index. décimale : 667.3 Teinture et impression des tissus Résumé : The traditional dyeing process of reactive dyes requires a large amount of inorganic salts to accelerate the combination of dyes and textiles, which leads to substantially more water pollution. In this work, we used a quaternary ammonium-type cationic modifier, 3-chloro-2-hydroxypropyl trimethylammonium chloride (CHPTAC), to modify the viscose acetal fibre before the dyeing process. After the modification, reactive dyes were dyed without any inorganic salt. Then the fabric was finished with a commercial wet rubbing fastness enhancer, FM-8, to improve the colour fastness. The modified viscose acetal fibre was characterised by Fourier Transform–infrared spectroscopy and scanning electron microscopy. The results showed that viscose acetal fibre was modified successfully by CHPTAC and that the physical structure did not noticeably change following the modification. The optimum process was determined by establishing the ideal amount of modifier and the modification temperature, as well as the concentrations of sodium hydroxide and soda ash. The results show that the most suitable parameters were 80 g/L for the modifier dosage, a modification temperature of 70°C, 20 g/L of sodium hydroxide and 10 g/L of soda ash. The wet rubbing fastness was grade 4-5 after finishing and dyeing. The exhaustion percentage was significantly higher than that for traditional dyeing, and the K/S and dyeing uniformity were both higher than traditional salt dyeing. Note de contenu : - EXPERIMENTAL : Materials and instruments - Cationic modification of viscose - Dyeing and soaping - Rubbing fastness finishing - Performance testing - RESULTS AND DISCUSSION : Modification reaction - SEM of the modified fibre - Effect of the amount of CHPTAC on dyeing performance - Analysis of zeta potential on the surface of modified cotton fabric - Effect of CHPTAC dosage on the grafting ratio and dyeing properties - Effect of sodium hydroxide dosage on dyeing properties - Effect of the modification temperature on fabric dyeing performance - Effect of soda ash dosage on the dyeing properties of fabrics - Exhaustion percentage curve of fabric - Fabric fastness testing - Table 1 : Comparison of dyeing fastness data of salted and non-salt–dyed viscose fabrics - Table 2 : Comparison of dyeing fastness data of salted and non-salt–dyed viscose fabrics post-treatment DOI : https://doi.org/10.1111/cote.12598 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12598 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37890 [article]

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Using biodegradable organic salt for cotton garment dyeing to reduce effluent pollution / Ali Raza in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 388-396 Titre : Using biodegradable organic salt for cotton garment dyeing to reduce effluent pollution Type de document : texte imprimé Auteurs : Ali Raza, Auteur ; Ali Shamhad, Auteur ; Awais Khatri, Auteur ; Alishba Javeed, Auteur Année de publication : 2022 Article en page(s) : p. 388-396 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation 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). Eaux usées -- Analyse Etudes comparatives Noir (couleur) Résistance à la traction Sels Solidité de la couleur Solidité de la teinture Teinture -- Fibres textiles Textiles et tissus -- Propriétés mécaniques Vêtements Index. décimale : 667.3 Teinture et impression des tissus Résumé : The replacement of inorganic salt and alkali in the reactive dyeing of cotton textiles with organic biodegradable compound has been explored in recent years. We report the use of organic salt, tetra sodium salt of glutamic acid diacetic acid (GLDA-Na4) in the batchwise dyeing of cotton garment as an exhausting and fixing agent. The reactive dye, CI Reactive Black 5 was selected for the present study. The results revealed that the maximum K/S value of 25.5 and fixation of 90.74% was obtained using GLDA-Na4 at laboratory scale experiments. Furthermore, the effluent samples test results demonstrated considerably reduced total dissolved solids (TDS) and chemical oxygen demand (COD) contents with GLDA-Na4 in comparison to the inorganic chemicals. The colourfastness to light, rubbing and washing have demonstrated similar ratings with GLDA-Na4 and inorganic chemicals. The tensile strength of samples was enhanced by using GLDA-Na4. Note de contenu : - EXPERIMENTAL : Materials - Methods - Measurements - RESULTS AND DISCUSSIONS : Effect of sodium chloride and sodium carbonate concentrations - Effect of fixation temperature and time in batchwise garment dyeing - Effect of GLDA-Na4 concentration - Effect of fixation temperature and time using GLDA-Na4 in batchwise garment dyeing - Comparison of dyeing results - Comparison of colour build-up of the dyed samples - Comparison of cost Colourfastness properties - Characterisation of the dyeing effluent - Tensile strength - Table 1 : Dyeing results comparison of organic salt and inorganic salt and alkali - Table 2 : Comparison of K/S and %F achieved using sodium edetate and tetra sodium salt of glutamic acid diacetic acid (GLDA-Na4) - Table 3 : Comparison of cost of dyed readymade cotton pants - Table 4 : Colourfastness to washing, light and rubbing results - Table 5 : Tensile strength of dyed samples in warp and weft directions DOI : https://doi.org/10.1111/cote.12599 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12599 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37891 [article]

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The relationship between colour harmony and colour emotions-using two-colour combinations applied on 3D colour configuration / Wen-Yuan Lee in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 397-406 Titre : The relationship between colour harmony and colour emotions-using two-colour combinations applied on 3D colour configuration Type de document : texte imprimé Auteurs : Wen-Yuan Lee, Auteur ; Shi-Min Gong, Auteur Année de publication : 2022 Article en page(s) : p. 397-406 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) Emotions -- Mesure Scheffé, Méthode de vision des couleurs Index. décimale : 535.6 Couleur Résumé : Both studies on colour emotion and colour harmony have been developed for many years. For designers, creating harmonious colour combinations that satisfy specific colour emotions has always been designers' pursuit. However, most of the studies used flat colour combinations and lacked the discussion of the influence of three-dimensional (3D) colour configuration on colour emotions and harmony. This study used the two-colour combinations applied to the 3D colour configuration to explore the relationship between colour emotions and colour harmony, intending to enhance designers' insights on the colour schemes. The multi-dimensional scaling was used to obtain the perceptual map, giving an overview of the relationships among colour emotions, colour harmony, and colour scheme techniques. The results showed that the emotion scales of "warm–cool", "soft–hard" and "heavy–light" are similar. The scales of "complex–simple", “active–passive” and “warm–cool” can be used to predict colour harmony. The harmonious colour combinations come along with "simple", "passive" and "warm" emotions. Note de contenu : - EXPERIMENTAL PLAN : The difference in seven types of colour scheme techniques on colour emotions and colour harmony COLOUR HARMONY MODEL - Table 1 : The experimental samples were categorised into seven types according to tone difference (∆tone) and hue angle difference (∆h) - Table 2 : Results from analysis of variance (anova) and the Scheffé post hoc test (at 99% significance level) - Table 3 : Correlation coefficients between colour harmony and colour emotions - Table 4 : The results of multiple regression analysis. The mean values of each scale are used as independent variables, and the coordinate of the colour scheme technique is the dependent variable - Table 5 : Results of stepwise multiple regression analysis. The colour emotions are set as independent variables with colour harmony as the dependent variable DOI : https://doi.org/10.1111/cote.12601 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12601 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37892 [article]

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Interaction of N-methylformanilide with high-performance polyimide fibre and its effect on dyeing / Dongyan Shao in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 407-416 Titre : Interaction of N-methylformanilide with high-performance polyimide fibre and its effect on dyeing Type de document : texte imprimé Auteurs : Dongyan Shao, Auteur ; Jinmei Du, Auteur ; Changhai Xu, Auteur ; Hongbo Wang, Auteur Année de publication : 2022 Article en page(s) : p. 407-416 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation N-méthylformanilide Polyimides Teinture -- Fibres textiles synthétiques Traitement thermique Index. décimale : 667.3 Teinture et impression des tissus Résumé : High-performance polyimide fibre is well known for its outstanding thermal stability, fire resistance and chemical stability, and it has great potential for use in fire-protective textiles. One major drawback of polyimide fibre is that it is difficult to dye under regular conditions. In this work, it was found that polyimide fibre could be dyed with disperse dyes with the assistance of N-methylformanilide. Thus, it was proposed that there might exist an interaction between polyimide fibre and N-methylformanilide that plays an important role in dyeing. Experimental results showed that N-methylformanilide penetrated into polyimide fibre, resulting in a slight swell in diameter and decrease in the breaking strength of polyimide fibre. X-ray diffractometric data showed no apparent solvent-introduced increase on the crystallinity of polyimide fibres but an orderly change on the interplanar spacing. When N-methylformanilide was removed from polyimide fibre by thermal treatment, the diameter, breaking strength and interplanar spacing of the polyimide fibres were all recovered to some extent. This indicated that the interactions between polyimide macromolecular chains were broken because of the penetration of N-methylformanilide, and new interactions occurred between polyimide macromolecular chains and N-methylformanilide that played a role in lubricating dye molecules to diffuse into polyimide fibres. Note de contenu : - MATERIALS AND METHODS : Materials - Dyeing of PI fibres - PI fibres treated with MFA - Thermal treatment of PI fibres - Characterisation - RESULTS AND DISCUSSION : Dyeing properties of PI fibres with MFA - Effect of MFA on PI fibre - Thermal treatment of MFA-treated PI fibre - Swelling mechanism - Table 1 : Parameters of XRD patterns of PI fibres DOI : https://doi.org/10.1111/cote.12602 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12602 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37893 [article]

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Comparison of semi-empirical and density functional approaches for the colour and constitution of anthraquinone dyes using X-ray structure / Ji-Yong Hwang in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 417-426 Titre : Comparison of semi-empirical and density functional approaches for the colour and constitution of anthraquinone dyes using X-ray structure Type de document : texte imprimé Auteurs : Ji-Yong Hwang, Auteur ; Sunghoon Kim, Auteur ; Shinya Matsumoto, Auteur Année de publication : 2022 Article en page(s) : p. 417-426 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption Anthraquinone Colorants Fonctionnelles densité La théorie de la fonctionnelle de la densité (pour Density Functional Theory, sous-entendu électronique : DFT) constitue au début du XXIe siècle l'une des méthodes les plus utilisées dans les calculs quantiques de la structure électronique de la matière (atomes, molécules, solides) aussi bien en physique de la matière condensée qu'en chimie quantique. La DFT trouve ses origines dans le modèle développé par Llewellyn Thomas et Enrico Fermi à la fin des années 1920. Rayons X Index. décimale : 667.3 Teinture et impression des tissus Résumé : Theoretical calculations with density functional theory, semi-empirical PM5 random phase approximation and Zerner's intermediate neglect of differential overlap CI were carried out for various amino and hydroxy anthraquinones using X-ray structure data. Comparing quantum chemical calculation results based on X-ray structure, the PM5 random phase approximation method was the most promising for the prediction of λmax for anthraquinone dyes among the computational methods studied here. From the results of calculated gross population, pz, it was found that the value of pz using the time-dependent density functional theory method was greater than the values calculated by semi-empirical methods. The overestimation of pz could be attributed to the incorrect density functional theory calculation results. The results of PM5 random phase approximation-calculated oscillator strength and torsion angle showed reasonable agreement with the observed results for sterically hindered anthraquinone dyes. Note de contenu : - COMPUTATIONAL METHOD - RESULTS AND DISCUSSION : TD-DFT, PM5/RPA and ZINDO/CI calculations of the absorption properties - Applications and performance of PM5/RPA in steric hindrance and λmax DOI : https://doi.org/10.1111/cote.12600 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12600 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37894 [article]

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A cyanine-based dual-modal probe for fluorimetric detection of mercury ion and colorimetric sensing of pH / Yanjie Li in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 4 (08/2022) . - p. 427-439 Titre : A cyanine-based dual-modal probe for fluorimetric detection of mercury ion and colorimetric sensing of pH Type de document : texte imprimé Auteurs : Yanjie Li, Auteur ; Youguo Qi, Auteur ; Zhenxiang Xu, Auteur ; Yanxi Song, Auteur ; Hongqi Li, Auteur ; Jian Zhang, Auteur ; Junjie Tang, Auteur ; Jun Zhou, Auteur Année de publication : 2022 Article en page(s) : p. 427-439 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Colorimétrie Cyanines Les cyanines sont le nom non systématique d'une famille de marqueurs synthétiques appartenant au groupe des polyméthines. Les cyanines ont de nombreuses utilisations comme marqueurs fluorescents, particulièrement en imagerie biomédicale. Selon la structure, elles couvrent un spectre allant de l'IR à l'UV. Ions mercure pH Produits chimiques -- Détection Sondes fluorescentes Index. décimale : 535.6 Couleur Résumé : A fluorescent probe derived from cyanine-rhodanine conjugate was developed for dual detection of mercury (Hg2+) ion and pH. Addition of Hg2+ ion to the weakly fluorescent probe solution in dimethyl sulphoxide/water (DMSO/H2O, 7:3, v/v) induced discernible colour change and fluorescence enhancement while other metal cations including Li+, Na+, K+, Ag+, Cu2+, Fe2+, Zn2+, Co2+, Ni2+, Mn2+, Sr2+, Ca2+, Mg2+, Al3+, Cr3+ and Fe3+ did not cause obvious change in colour and fluorescence emission. The detection limit of the probe toward Hg2+ ion is 1.61 × 10−7 M. The probe also exhibited remarkable pH-responsive effect. It acts as a dual chromogenic and spectroscopic probe for determining different pH scales over a wide range of pH 1.0–14.0: bright yellow with maximum wavelength (λmax) 416 nm for pH 1.0–2.0, orange with λmax 470 nm for pH 3.0–9.0, and pale yellow with λmax below 400 nm for pH 10.0–14.0. Plausible sensing mechanisms of the probe toward Hg2+ ion and pH have been proposed. Note de contenu : - EXPERIMENTAL : Materials and instruments - Synthesis of probe CY - Measurements of absorption and fluorescence spectra - RESULTS AND DISCUSSION : Preparation of probe CY - Sensing of mercury ions by probe CY - Sensing of pH by probe CY - Table 1 : Performance comparison of fluorescent probes for the detection of mercury (Hg2+) ion - Table 2 : Application of probe CY to determination of mercury (Hg2+) ion concentrations in different water samples DOI : https://doi.org/10.1111/cote.12603 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12603 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37895 [article]

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