Indigo reduction by using microorganism: Comparison of reducing power between Dietzia sp. KDB1 and yeast (Saccharomyces cerevisiae) / Chanhee Jung in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 262-269 Titre : Indigo reduction by using microorganism: Comparison of reducing power between Dietzia sp. KDB1 and yeast (Saccharomyces cerevisiae) Type de document : texte imprimé Auteurs : Chanhee Jung, Auteur ; Jong Il Rhee, Auteur ; Dong Il Yoo, Auteur Année de publication : 2024 Article en page(s) : p. 262-269 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibres de ramie Fibres végétales Glucose Indigo Microorganismes pH Réduction (chimie) Teinture Teinture -- Fibres textiles Index. décimale : 667.2 Colorants et pigments Résumé : This study aims to develop microbial indigo reduction by comparing the reducing power between Dietzia sp. KDB1 and yeast (Saccharomyces cerevisiae) at some reduction conditions. Oxidation–reduction potential (ORP), colour strength (K/S), and fluorescence intensity (FI) were applied to evaluate the reduction level as a function of microorganism concentration, pH, and glucose addition at 30°C. For both of the microbial systems, ORP decreased further −20 mV and K/S increased more than two by adding glucose. The reduction level became higher slightly by adding glucose, which played a role of metabolite in both of the reduction systems. Overall, reduction level of the yeast system was about a half of KDB1 system at the same reduction condition of 45 mL volume, 15 g/L natural indigo, 6 g/L reducing agents, pH 10.0, 30°C and glucose added. Note de contenu : - EXPERIMENTAL : Materials - Cultivation and quantification of strain - Indigo reduction and dyeing - Evaluation of reducing power - RESULTS AND DISCUSSION : Reducing power according to concentration and volume - Reducing power according to pH - Reducing power according to glucose addition DOI : https://doi.org/10.1111/cote.12712 En ligne : https://drive.google.com/file/d/1CJaeSpHiUQVRXu7moFZiMG81KM7vz8KY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40942 [article]

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Structural characterisation and coloration of ligno-cellulose and protein fibre-blended structures / Manik Bhowmick in COLORATION TECHNOLOGY, Vol. 139, N° 6 (12/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 6 (12/2023) . - p. 728-741 Titre : Structural characterisation and coloration of ligno-cellulose and protein fibre-blended structures Type de document : texte imprimé Auteurs : Manik Bhowmick, Auteur ; Santanu Basak, Auteur Année de publication : 2023 Article en page(s) : p. 728-741 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorimétrie Fibres animales Fibres de ramie Fibres textiles -- Propriétés mécaniques Lignocellulose Mélanges de fibres Soie et constituants Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : This study investigates the structures produced by blending ligno-cellulosic (ramie fibre, Boehmeria nivea L.) and protein fibres (mulberry silk, Bombyx Mori) with dissimilar mechanical properties. Ramie fibre, used for blending, is a ligno-cellulosic fibre with very high tenacity but low elongation. On the other hand, silk (mulberry) fibre has lower tenacity with better elongation. Blended fibrous structures have shown satisfactory tensile strength and elongation, while other physical properties, such as coefficient of friction, brightness and flexural rigidity, have also been improved. Technical findings revealed that the coefficient of friction reduced from 0.79 to 0.48 and specific work of rupture improved from 2.3 to 3.43 mJ/tex after incorporation of silk in the ligno-cellulosic fibre strand. Blended yarn cross-sectional images showed that finer silk fibres came to the surface, whereas the comparatively coarser cellulose-based ramie fibre migrated to the core. Atomic force microscopy of the blend structure was examined to assess the roughness and uniformity of the surface. Fourier Transform–infrared spectroscopy analysis verified the presence of amide groups (associated with silk fibre) and glucose ring groups (associated with the cellulose of Ramie fibre) in the same graph. In addition, innovative techniques of simultaneous coloration of the developed blends are also proposed scientifically. Note de contenu : - MATERIALS AND METHODS : Materials - Blended yarn or blended - fibre strand preparation - Tensile testing - Friction testing - Bending test - Packing coefficient - Wicking test - SEM study - AFM study - Fourier Transform-infrared analysis - Measurement of the whiteness, yellowness and brightness indexes - Dyeing of the blended yarn - Measurement of colour value, yellowness and brightness indexes - RESULTS AND DISCUSSION : Friction and bending properties of yarn - Yarn abrasion and packing coefficient - Capillary action of the blended yarn structure - AFM analysis of the blend - Table 1 : Frictional properties of the blended yarns made from ramie and silk fibres - Table 2 : Major characteristic peaks observed in the ramie and silk blended yarns - Table 3 : Comparison of different properties of the ramie-silk blended yarns - Table 4 : Colour-related parameters of the dyed blended yarns DOI : https://doi.org/10.1111/cote.12683 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12683 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40123 [article]

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The effect of alkali treatment and addition of microcrystalline cellulose (MCC) on physical and tensile properties of ramie/polyester laminated composites / Jamasri in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 32, N° 2 (04/2022)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 32, N° 2 (04/2022) . - p. 77-84 Titre : The effect of alkali treatment and addition of microcrystalline cellulose (MCC) on physical and tensile properties of ramie/polyester laminated composites Type de document : texte imprimé Auteurs : Jamasri, Auteur ; Ferriawan Yudhanto, Auteur Année de publication : 2022 Article en page(s) : p. 77-84 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Composites à fibres végétales -- Propriétés mécaniques Elasticité Essais dynamiques Fibres de ramie Polyesters Stratifiés -- Propriétés mécaniques Structure cristalline (solide) Traitement chimique Index. décimale : 668.4 Plastiques, vinyles Résumé : The aim of this research is to investigate the effect of alkali treatment of ramie fibers and addition of MCC on the properties of ramie/polyester laminated composites. The alkali treatment was performed using NaOH solution at a room temperature. The laminated composites was manufactured using a vacuum infusion method for three layers of treated woven ramie fibers in the polyester matrix. The MCC (microcrystalline cellulose) powder 0.5 wt.% was added into the polyester resin and then mixed by a mechanical stirrer at a rotation speed of 350 rpm for 5 minutes. The physical characterization was evaluated using FTIR, XRD, and SEM methods. The tensile test of a single fiber and laminated composites was carried out according to the ASTM D3379 and ASTM D3039, respectively. The experimental results show that the XRD of treated fiber with 5 wt.% NaOH solution has the highest crystallinity index of 66.3%. It impacts the increase of tensile strength and elastic modulus of single ramie fiber by 18% and 55%, respectively. The addition of MCC into the polyester matrix of laminated composite can increase the tensile strength and elastic modulus by 18% and 21%, respectively, compared to the untreated laminated composite. In addition, the treated fibers laminated composite can improve the adhesion and chemical bonding between fibers and polyester as a matrix. The addition of MCC filler may prevent the initial propagation of cracks on interlaminar surfaces of laminated composite. Note de contenu : - MATERIALS AND METHODS : Alkali treatments - X-Ray diffraction testFTIR (Fourier Transform Infra-Red) test - SEM (Scanning Electron Microscope) - Tensile test of a single ramie fiber Ramie/polyester laminate composite fabrication - Tensile test of laminated composite - RESULTS AND DISCUSSION : X-Ray diffraction analysis - FTIR (Fourier Transform Infrared) analysis of ramie fibers - Tensile strength of single ramie fiber - Tensile strength of ramie/polyester laminate composites (LC) - Photo SEM of ramie/polyester laminate composite after tensile test DOI : https://doi.org/10.18280/rcma.320204 En ligne : https://www.iieta.org/download/file/fid/74280 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37700 [article]

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