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Reactive dyes for living cells : Applications, artefacts, and some comparisons with textile dyeing / Richard W. Horobin in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 3-15 Titre : Reactive dyes for living cells : Applications, artefacts, and some comparisons with textile dyeing Type de document : texte imprimé Auteurs : Richard W. Horobin, Auteur ; Juan C. Stockert, Auteur ; Hua Zhang, Auteur Année de publication : 2022 Article en page(s) : p. 3-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cellules Colorants réactifs Sondes fluorescentes Index. décimale : 667.3 Teinture et impression des tissus Résumé : An inclusive chemical definition of “reactive” dyeing of textiles is introduced, encompassing the CI Azoic, CI Mordant, CI Reactive, CI Sulphur and CI Vat dye application classes. Such reactive dyeing increases fibre retention of dye and makes application practically possible. The analogous application of dyes and fluorescent probes as microscopic stains in biology and medicine is outlined, focussing on using reactive fluorescent probes with living cells. Parallels with textile dyeing are noted, eg, enhanced probe retention and facilitation of probe application. However, the primary purpose of using reactive probes with live cells is detection of properties of biological systems : to identify biological structures and chemical/biochemical contents ; assess biological functions and physicochemical properties; and determine changes in locations of cells and cell components. Problems occurring with such probes are outlined, particularly the problematic character of many standard protocols, and localisation artefacts arising with reactive probes whose reactant and product species are physiochemically significantly different. This latter problem is explored via a case study of possible reactant/product artefacts with probes for reactive oxygen species. Comparison of experimental observations of probe localisations with the localisations predicted using quantitative structure activity (QSAR) modelling indicates that such artefacts can occur with a significant proportion of chemically diverse, widely used, commercially available probes, as well as with experimental compounds reported in the literature. A graphical flowchart is provided to assess possible occurrence of reactant/product artefacts arising with reactive fluorescent probes localising in various organelles of living cells. Note de contenu : - Contrasting perspectives on “reactive” dyeing of textiles - Dyes and fluorescent probes used as microscopic stains in biology and medicine - Why are some fluorescent probes reactive ? - Problems arising with reactive fluorescent probes applied to live cells - Standard protocols are more problematic than commonly assumed - Consequences of physicochemical differences between a reactant and its product - Case study of possible reactant/product artefacts arising with probes for reactive oxygen species - Predicting the occurrence of reactant/product localisation artefacts - Assessing occurrence and frequency of reactant/product localisation artefacts - Table 1 : Some illustrative examples of using fluorescent probes to obtain information concerning living biological systems - Table 2 : Pay-offs of reactivity for different dye classes in textile dyeing, and for different probe types in investigations of living cells and tissues - Table 3 : How differences in physicochemical properties influence cellular localisation of MTT Tetrazolium and MTT Formazan, the reactant and product species of a reactive probe DOI : https://doi.org/10.1111/cote.12577 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12577 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37494 [article]

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Assessment of the UV inkjet ink penetration into laboratory papers within triticale pulp and its influence on print quality / Irena Bates in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 16-27 Titre : Assessment of the UV inkjet ink penetration into laboratory papers within triticale pulp and its influence on print quality Type de document : texte imprimé Auteurs : Irena Bates, Auteur ; Ivana Plazonic, Auteur ; Katja Petric Maretic, Auteur ; Maja Rudolf, Auteur ; Valentina Radic Seles, Auteur Année de publication : 2022 Article en page(s) : p. 16-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Evaluation Impression jet d'encre Mesure Papier -- Coloration Pénétration (physique) Index. décimale : 620.197 Matériaux fibreux d'origine végétale et animale : textiles, papier Résumé : Today the print quality of digital printing techniques has improved and is considered satisfactory and competitive to analogue techniques for certain graphic products. Satisfactory print quality mostly depends on the interaction of ink and printing substrate where ink penetration has an important role. Namely, the ink penetration affects the parameters that describe the print quality together with visual appearance of print density and mottling. Therefore, it is important to select an adequate printing substrate for each printing technique. Awareness of environmental problems related to the shortage of wood raw materials has led to an increase in the use of recycled printing paper and in particular the implementation of new alternative sources of cellulose fibres instead of virgin wood fibres in the papermaking process. In this research the emphasis is precisely on defining the influence of ink penetration into laboratory papers made of triticale pulp on the final print quality. The laboratory printing papers were obtained by mixing triticale pulp with pulp from recycled fibres in three different portions. Papers were thereafter printed by ultraviolet (UV) inkjet printer and the ink penetration within laboratory papers with and without straw pulp was analysed using two methods of ink penetration analysis (microscopic/spectroscopic). The influence of ink penetration on the final print quality was observed and analysed based on several quality parameters (optical ink density, mottling and colorimetric values). These results confirmed that triticale pulp in laboratory papers provides equal print quality compared to laboratory papers made only from pulp from recycled fibres. Note de contenu : - EXPERIMENTAL : Laboratory papers - Printing of laboratory papers - Analysis - RESULTS AND DISCUSSION : Measurement of ink penetration depth - Assessment of print quality - Table 1 : Pulping conditions - Table 2 : Laboratory papers composition and some basic characteristics - Table 3 : Characteristics of the control sample (N)–Ink penetration depth (Hpm and Hps) and print quality parameters (mottling and optical ink density) - Table 4 : The Euclidean colour difference (ΔE00*) between printed reference laboratory paper without triticale pulp (N) and printed laboratory papers with triticale pulp (1NT, 2NT, 3NT) DOI : https://doi.org/10.1111/cote.12563 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12563 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37495 [article]

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Development of bacterial cellulose film coated with mixed colorimetric indicator for tracking the freshness/spoilage of ready-to-cook idli batter / P. S. Gaikwad in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 28-37 Titre : Development of bacterial cellulose film coated with mixed colorimetric indicator for tracking the freshness/spoilage of ready-to-cook idli batter Type de document : texte imprimé Auteurs : P. S. Gaikwad, Auteur ; Chayanika Sarma, Auteur ; Anbarasan Rajan, Auteur ; S. Anandakumar, Auteur ; B. K. Yadav, Auteur Année de publication : 2022 Article en page(s) : p. 28-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aliments -- Aspect sanitaire Caractérisation Cellulose bactérienne Colorants Colorimétrie Couches minces Couches minces -- Propriétés thermiques Etiquettes Système de changement de couleur Index. décimale : 667.2 Colorants et pigments Résumé : The current study focuses on the fabrication of a mixed chemical colorimetric pH dye-based indicator to monitor the freshness of ready-to-cook (RTC) idli batter stored under ambient conditions. The base of the indicator label was created using Acetobacter xylinum culture for the fabrication of a bacterial cellulose (BC) membrane film, and the characteristics of the developed film were analysed. Scanning electron microscopy identified the presence of a cellulose fibrils network and Fourier Transform–infrared spectroscopy indicated the presence of an amine group at wavenumber 1642 cm−1 on the developed BC film. Differential scanning calorimetry analysis identified the glass transition, onset, melting and end set melt temperatures as −30.3, 42.2, 85.6 and 105.9°C, respectively, and enthalpy as 209.2 Jg−1. The tensile strength of the developed base layer was found to be low at 27.11 ± 0.05 MPa. The developed base layer was coated with mixed colorimetric pH dyes of bromothymol blue and methyl red in a ratio of 2:3. The fabricated mixed colorimetric indicator label reacted as the carbon dioxide concentrations in the headspace increased from 0.15% ± 0.05% to 17.64% ± 0.11% (v/v) for up to 24 hours, and displayed a colour change of yellow for fresh to reddish orange for spoiled RTC idli batter stored under ambient conditions. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of RTC idli batter - Fabrication of a base layer for the indicator label - Selection and preparation of colorimetric pH dye as an indicator solution - Testing of the developed colour change indicator labels - pH of stored RTC idli batter - Microbial population study of stored RTC idli batter - Statistical analysis - RESULTS AND DISCUSSION : Characterisation of the developed BC film - Colour change of the indicator label caused by carbon dioxide concentration - pH of stored RTC idli batter - Microbial population of stored RTC idli batter - Image acquisition of colour change indicator labels - Table 1 : Intermolecular interaction of developed bacterial cellulose film using Fourier Transform–infrared spectroscopy - Table 2 : Thermal characteristics of developed bacterial cellulose film using differential scanning calorimetry DOI : https://doi.org/10.1111/cote.12564 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12564 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37496 [article]

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Colorimetric chemosensor for Cu(II) from electrospun nanofibrous mat mixed with 5-methoxy-salicylaldehyde azine / Apisit Karawek in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 38-46 Titre : Colorimetric chemosensor for Cu(II) from electrospun nanofibrous mat mixed with 5-methoxy-salicylaldehyde azine Type de document : texte imprimé Auteurs : Apisit Karawek, Auteur ; Pipattra Mayurachayakul, Auteur ; Apisama Dilokpramuan, Auteur ; Choladda Srisuwannaket, Auteur ; Kornkanya Pratumyot, Auteur ; Withawat Mingvanish, Auteur ; Mongkol Sukwattanasinitt, Auteur ; Pinit Kidkhunthod, Auteur ; Nakorn Niamnont, Auteur Année de publication : 2022 Article en page(s) : p. 38-46 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétate de cellulose L'acétate de cellulose est une matière plastique inventée en 1865. C'est l'ester acétate de la cellulose. Capteurs chimiques Caractérisation Colorimétrie Composés organiques -- Synthèse Electrofilature Ions cuivre Ligands Nanofibres Index. décimale : 677.46 Cellulosiques : rayonnes, acetates Résumé : The condensation product of 5-methoxy-salicylaldehyde with hydrazine hydrate (referred to below as compound 1) was used as a ligand in a cellulose acetate electrospun nanofibrous mat to determine copper ions in aqueous solutions. The electrospun nanofibrous mats, based on cellulose acetate mixed with compound 1, were constructed using an electrospinning method and had a diameter of 260 nm. The sensing nanofibrous mat exhibited a sensitive and selective response for Cu(II) ions over a linear concentration range of 1-30 µM in a 0.1 M HEPES buffer (pH 7.4) using a colorimeter. The detection limit of the method was 1.04 µM lower than the maximum level of Cu(II) in drinking water (16 µM, as determined by the US Environmental Protection Agency). Additionally, it exhibited high selectivity for Cu(II) ions over 13 other cations. The sensing nanofibrous mat was fully reversible for ethylenediamine tetraacetic acid treatment cycles. Preliminary results indicated the sensitivity and selectivity of the nanofibrous mat for detecting Cu(II) ions by naked-eye detection from yellow to orange. The reaction product of compound 1 and the Cu(II) ion was studied using X-ray absorption spectroscopy. The Cu-coordination number was approximately 5.023 ± 1.42, and the Cu–N distance (R) was 1.986 Å. The nanofibrous mat demonstrated a convenient and straightforward Cu(II) ion-detection technique in both wastewater and water environments. Note de contenu : - EXPERIMENTAL : Materials and methods - Analytical instruments - Synthesis of compound - Electrospinning and characterisation of CA nanofibrous mat mixed with compound - General procedure for visual detection of Cu(II) ions of the nanofibrous mat using a colorimeter - X-ray absorption near-edge structure measurement for Cu-oxidation number determination of compound 1–Cu complex - Real samples of Cu(II) detection using the nanofibrous mat - RESULTS AND DISCUSSION : Synthesis of compound - Fabrication and characterisation of compound 1-incorporated CA nanofibrous mat - Optimal conditions for Cu(II) ion-sensing using the nanofibrous mat - Cu(II) ion detection - Interference study - XANES measurement for Cu-oxidation number determination of compound 1–Cu complex - Real sample detection - The reusability and reproducibility of the nanofibrous mat - Table 1 : The percentage recovery data for the detection of Cu(II) in spiked wastewater samples (n = 3) - Table 2 : Comparison of the Cu(II) ion-sensing properties of different sensors DOI : https://doi.org/10.1111/cote.12567 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12567 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37497 [article]

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Introducing new methods based on the standard ISO/IEC 24790 to evaluate graininess for coloured printed images / Bita Panahi in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 47-57 Titre : Introducing new methods based on the standard ISO/IEC 24790 to evaluate graininess for coloured printed images Type de document : texte imprimé Auteurs : Bita Panahi, Auteur ; Saeideh Gorji Kandi, Auteur Année de publication : 2022 Article en page(s) : p. 47-57 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique) Granulation Impression en couleur Papier Papier -- Texture Index. décimale : 620.197 Matériaux fibreux d'origine végétale et animale : textiles, papier Résumé : Printing quality control has been one of the challenges in the printing industry. Therefore, it is indispensable to find evaluation methods with high correlations with the human visual system to assess the quality of the printed images. Standard ISO/IEC 24790 is one of the recommended standards to achieve this goal. An evaluation procedure for graininess, a common defect in printing, has been presented in this standard; however, this procedure is suggested only for monochrome printed images. Hence, in this research, the graininess of coloured samples is evaluated based on the proposed method in this standard with considering the effect of the paper. For this purpose, fictitious graininess defects are designed and applied on coloured samples and are printed on different papers. A visual assessment is performed to examine the effect of colour and paper differences on graininess. Six different methods, including the method suggested in the standard and the proposed modified procedures, are used to evaluate graininess, and their results are compared to subjective results. Moreover, three other wavelets are studied besides the suggested one in the standard. To eliminate the effect of paper texture, a Gaussian filter is utilised. The results show that applying the Gaussian filter to images increases the correlation between computational procedure results and visual assessment results. Also, the results indicate that utilising haar wavelet slightly increases the correlation. The results demonstrate that besides assessing graininess in greyscale mode, evaluating graininess in RGB (red, green, blue) colour space results in a high correlation with the visual assessment results. Note de contenu : - EXPERIMENTAL : Characteristics of paper - Spectral data - Gloss - Texture - Sample preparation - Visual assessment - Graininess calculations - RESULTS AND DISCUSSION : Visual comparison results - Graininess calculations - Evaluation of graininess with paper texture removal - Effect of different wavelets on graininess evaluation - Table 1 : The CIELab values of used papers - Table 2 : The gloss values of used papers - Table 3 : The correlation between visual comparison results and graininess evaluation results by using different procedures - Table 4 : The correlation between visual comparison results and graininess evaluation results by using different procedures and applying Gaussian filter - Table 5 : The correlation between visual assessment results and graininess evaluation results by using different wavelets and applying Gaussian filter DOI : https://doi.org/10.1111/cote.12570 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12570 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37498 [article]

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Investigation into the reaction of reactive dyes with carboxylate salts and the application of carboxylate-modified reactive dyes to cotton / David M. Lewis in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 58-70 Titre : Investigation into the reaction of reactive dyes with carboxylate salts and the application of carboxylate-modified reactive dyes to cotton Type de document : texte imprimé Auteurs : David M. Lewis, Auteur ; Peter J. Broadbent, Auteur ; Chris M. Carr, Auteur ; Wei D. He, Auteur Année de publication : 2022 Article en page(s) : p. 58-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carboxylate Citrate de sodium Colorants -- Synthèse 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). Fixation (chimie) Formiate de sodium Impression jet d'encre Impression sur étoffes Orange (couleur) Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Ink-jet printing of cellulosic fabrics with reactive dyes typically requires that the fabric is pretreated with alkali, prior to printing, to facilitate efficient fixation of the dye. In this paper we evaluate the use of sodium formate and other carboxylate salts as a neutral (pH 6.5) pretreatment process. The thickened, prepared-for-print pad liquor contained at least 50 gdm−3 of the selected carboxylate salt and was applied to the cotton fabrics by a pad-dry procedure. The fabric was then ink-jet printed with reactive dye inks, followed by standard steaming and washing-off processes. The pH of the carboxylate salt pretreatment was 6.5 and the aqueous extracts from the print fabrics at the end of the steaming process remained at pH 6.5. It was observed that even at pH 6.5, in the presence of selected carboxylates, significant reactive dye fixation could be achieved on a cotton substrate, whereas in the absence of the carboxylate, very little or even zero fixation was achieved. Infrared and capillary electrophoresis analyses of model reactions of reactive dyes with the carboxylate salts indicated that reactive ester residues were formed, and which subsequently promoted reaction with the cellulosic substrates. In addition to improving reactive dye fixation in ink-jet printing, the carboxylate-modified dyes were also demonstrated to improve long-liquor dyeing properties on cotton substrates. As an extension of this carboxylate-based printing process, the incorporation of lithium acetate (100 gdm−3) into the ink formulation was further studied and it was demonstrated that the necessity for a preparative pretreatment process could be eliminated. Note de contenu : - EXPERIMENTAL AND METHODS : Materials - Synthesis of a model SES dye - Model SES dye reaction with sodium formate - Model SES dye reaction with sodium citrate - Modification of commercial reactive dyes with sodium formate and sodium citrate - Cotton fabric preparation for subsequent ink- jet printing- Laboratory- ased, ink-jet printing application - Long-liquor dyeing Fixation - FTIR analysis - CE analysis of reactive dyes - RESULTS AND DISCUSSION : Activator evaluation - Ink-jet prints showing the effect of activators - "All-in" system for ink-jet printing with reactive dye-based inks - FTIR analysis of reactive dyes modified with carboxylates - CE analysis of selected commercially available reactive dyes and their carboxylate derivatives - Table 1 : Capillary electrophoresis (CE) analysis of formate- and citrate- modified Remazol Red RB and Remazol Brilliant Orange 3R reactive - Table 2 : Capillary electrophoresis (CE) analysis of formate- modified Cibacron Blue FR and Cibacron Red FB reactive dyes - Table 3 : Fixation and colour yield values following long- liquor dye application of 1%- 2% owf Remazol Red RB dye and carboxylate dye derivatives to cotton fabric - Table 4 : Fixation and colour yield values following long- liquor dye application of 1%- 2% owf Cibacron Red FB dye and carboxylate dye derivatives to cotton fabric DOI : https://doi.org/10.1111/cote.12571 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12571 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37499 [article]

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Accelerated weathering performance of wood-plastic composites reinforced with carbon and glass fibre-woven fabrics / Sefa Durmaz in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 71-81 Titre : Accelerated weathering performance of wood-plastic composites reinforced with carbon and glass fibre-woven fabrics Type de document : texte imprimé Auteurs : Sefa Durmaz, Auteur ; Yusuf Ziya Erdil, Auteur ; Özlem Özgenç, Auteur Année de publication : 2022 Article en page(s) : p. 71-81 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Composites à fibres Composites à fibres végétales Essais accélérés (technologie) Essais dynamiques Fibres de carbone Fibres de verre Flexion (mécanique) Polyéthylène greffé anhydride maléique Polyéthylène haute densité Réaction de couplage Résistance aux conditions climatiques Index. décimale : 668.4 Plastiques, vinyles Résumé : Wood-plastic composites (WPCs) are new generation materials widely used in outdoor conditions; however, the appearance and mechanical properties of WPCs change with exposure to weather. In this study, high-density polyethylene-based flat-pressed WPCs are reinforced with carbon and glass fibre-woven fabrics for uses where high mechanical properties are needed in outdoor conditions. For this purpose, WPCs are exposed to accelerated weathering conditions to determine the effect of weathering with and without reinforcement. The results show that, after weathering, colour changes are inevitable for WPCs. Attenuated total reflection–Fourier transform-infrared analysis reveals the changes in the matrix's chemical structure, illustrating the alterations in WPC surface characteristics. The mechanical properties of WPCs decrease as a result of photodegradation. However, the reinforced WPCs have higher mechanical properties than the control samples, despite extensive degradation. Carbon fibre (200 g/m2) achieved the greatest flexural strength and modulus of elasticity, 150% and 122% higher, respectively, than unreinforced WPCs. Scanning electron microscopy analysis shows that, despite the intensive photodegradation on the surface, the integration of the matrix and woven fabrics was still strong. The surface erosion was observed with light microscopy. The visual appearance also exhibited some changes that occurred on the surface of WPCs. Note de contenu : - MATERIALS AND METHODS : Materials - Composite processing - Accelerated UV weathering test - Colour measurement - ATR–FTIR spectroscopy analysis - Flexural testing and modulus of elasticity - Microscopic analysis - RESULTS AND DISCUSSION : Colour change - ATR–FTIR spectroscopy analysis - Flexural properties and MOE - Visual appearance - Microscopic images - Table 1 : Changes in the wood index after weathering - Table 2 : Changes in the flexural properties of wood-plastic composites after weathering DOI : https://doi.org/10.1111/cote.12572 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12572 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37500 [article]

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Enhancing dye adsorption of wool by controlled and facile surface modification using sodium bisulphite / Zhe Jiang in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 82-89 Titre : Enhancing dye adsorption of wool by controlled and facile surface modification using sodium bisulphite Type de document : texte imprimé Auteurs : Zhe Jiang, Auteur ; Yiyi Zhang, Auteur ; Nan Zhang, Auteur ; Qiang Wang, Auteur ; Ping Wang, Auteur ; Yuanyuan Yu, Auteur ; Man Zhou, Auteur Année de publication : 2022 Article en page(s) : p. 82-89 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisulfite de sodium Colorants -- Adsorption Colorants acides Laine Teinture -- Fibres textiles Traîtements de surface Index. décimale : 667.3 Teinture et impression des tissus Résumé : Wool is a natural biopolymer with special properties, including warmth retention and skin-friendliness. However, its application in the textile industry is limited by the scale layer that covers its surface, which prevents the efficient diffusion of dye into the interior of its fibres, and increases wool's susceptibility to shrinkage during washing. Here, dissolution with sodium bisulphite is used for wool surface modification. The properties of surface dissolved wool are comprehensively characterised, including strength loss, shrinkage rate and dyeability. The three-dimensional images indicated that scale layer was etched. Coupled with Fourier-transform infrared (FTIR) spectra, the test results of strength loss and shrinkage rate indicated that surface dissolution degree can be controlled by time and temperature, and that the process does not break the fibre's main body structure. Dyeability properties, including dye absorption rate, deepness and uniformity at a lower temperature were enhanced, indicating amenability to industrial production. Our findings highlight a novel, efficient method of modifying protein fibre surface for enhancing properties with potential for large-scale application. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - - RESULTS AND DISCUSSION : Three-dimensional surface morphology - Fourier-transform infrared analysis - Disulphide bond analysis - Impact of surface dissolution on loss of wool strength - Impact of surface dissolution on wool shrinkage rate - Dye diffusion in natural versus modified wool dyed with acid milling dye and acid supermilling dye - Performance of raw and surface-modified wool under low temperature dyeing - Dye absorption curve of surface-dissolved wool during low temperature dyeing - Diffusion coefficient analysis - Table 1 : Comparison of performance between raw and surface-modified wool under various concentrations of sodium bisulphite during low temperature dyeing - Table 2 : The diffusion coefficient of raw and surface modified wool using acid milling dye DOI : https://doi.org/10.1111/cote.12573 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12573 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37501 [article]

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Flexible longitudinal and transversal displacement sensors based on a composite of CI Disperse Orange 25 and carbon nanotubes / Irfan Ullah in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 90-96 Titre : Flexible longitudinal and transversal displacement sensors based on a composite of CI Disperse Orange 25 and carbon nanotubes Type de document : texte imprimé Auteurs : Irfan Ullah, Auteur ; Khasan Sanginovich Karimov, Auteur ; Mohamed Adib Ibrahim, Auteur ; Noshin Fatima, Auteur Année de publication : 2022 Article en page(s) : p. 90-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteur de déplacement flexible Capteurs (technologie) Colles:Adhésifs Nanotubes Orange (couleur) Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Technologie médicale Index. décimale : 681.51 Electronique et informatique industrielle, capteur Résumé : This paper presents the proposal and characterisation of a flexible, shockproof, vibration-free, longitudinal and transversal compressive displacement sensor based on a composite of CI Disperse Orange 25 and carbon nanotubes created with an energy-free, drop-casting technique. The structural morphology of each layer is studied briefly through X-ray diffraction. Electric investigations of the sensors in the form of impedance were performed as a function of longitudinal and transversal compressive displacement at three different frequencies. The compressive displacements were measured from 0 to 250 µm at three fixed frequencies (ie, 1, 10 and 200 kHz). The impedance has an inverse relationship with longitudinal compressive displacement but a direct relationship with transversal compressive displacement. The frequency to impedance relationship is inverse with the sensitivity of the impedance as a function of longitudinal displacement. Because of their small size, light weight and simple fabrication technique and design, as well as their low cost and maintenance, these types of devices can be utilised across a wide range of medical applications, such as in rehabilitation centres, for machine status assessment during physiotherapy, and in robotic body parts, as well as for educational purposes in universities. Note de contenu : - Table 1 : Summary of the longitudinal and transverse compressive displacement sensor sensitivities DOI : https://doi.org/10.1111/cote.12574 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12574 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37502 [article]

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Comparative study of four different flavonoid compounds-containing plant extracts functionalised waste wool for accelerating aqueous chromium(VI) reductive removal / Jiayu Gu in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 97-113 Titre : Comparative study of four different flavonoid compounds-containing plant extracts functionalised waste wool for accelerating aqueous chromium(VI) reductive removal Type de document : texte imprimé Auteurs : Jiayu Gu, Auteur ; Yongchun Dong, Auteur ; Jiaxuan Zhang, Auteur Année de publication : 2022 Article en page(s) : p. 97-113 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Caractérisation Chrome hexavalent Déchets industriels -- Elimination Evaluation Extraits de plantes Flavonoïdes Laine -- Déchets Réduction (chimie) Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Four different plant material extracts containing flavonoid compounds were prepared with fruits of Lycium ruthenicum Murray (LRM) and Vaccinium spp. (VS), Ginkgo biloba L. (GBL) leaves and grape seeds. On the basis of several characterisation, these extracts were then used for functionalising waste wool fibres by an exhaustion dyeing process. Content of deposited flavonoid compounds and aqueous chromium(VI) reductive removal capacity of four plant material extract dyed wool fibres were investigated and compared. The results indicated that LRM and VS extracts contained more flavonoid compounds (0.12-0.15 mg ml−1) than the other two extracts (0.06-0.08 mg ml−1), which led to high content of deposited flavonoid compounds and strong chromium(VI) reductive removal performance of their dyed wool fibres. Importantly, 0.10 mmol L−1 of chromium(VI) species could be almost completely removed by fallen GBL extract dyed wool fibre from water by increasing content of deposited flavonoid compounds up to 8.0 mg g−1, which offer a novel strategy to produce cost-effective, environmental-friendly and renewable chromium(VI) removal material based on waste control by waste. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Extraction of flavonoid compounds from four plant materials - Characterisation of four plant material extracts - Dyeing procedure of wool fibre with plant material extracts - Reducing power evaluation - Chromium(VI) species removal study - Reusability experiments - RESULTS AND DISCUSSION :| Characterisation of four plant material extracts - Optimised dyeing process of wool fibre with the four plant material extracts - Reductive removal of chromium(VI) using plant material extract dyed wool fibres - Chromium(VI) removal kinetics - Recycling capacity study - Seasonal variations of total flavonoid content value and chromium(VI) reduction from Ginkgo biloba L. (GBL) leaves - Comparison with other chromium(VI) removal materials - Table 1 : Chromium(VI) reduction and chromium(III) adsorption pseudo-second-order kinetic model parameters for four plant material extract dyed wool fibres - Table 2 : Comparison of the four dyed wool fibres with several typical chromium(Vl) removal materials DOI : https://doi.org/10.1111/cote.12575 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12575 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37503 [article]

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