Automated clean leather dyeing assisted by wringing, ultrasound and microwave / Ying Gong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 4 (04/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 4 (04/2011) . - p. 127-132 Titre : Automated clean leather dyeing assisted by wringing, ultrasound and microwave Type de document : texte imprimé Auteurs : Ying Gong, Auteur ; Kang Cheng, Auteur ; Tao Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2011 Article en page(s) : p. 127-132 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Teinture Diffractométrie de rayons X Micro-ondes Microscopie électronique à balayage Ultrasons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A “clean” leather dyeing was designed with wringing (8-10 kg/cm2), ultrasound (28 kHz, 2.4 W/cm2) and microwave (2450 MHz, 10 W/L). Twenty leathers samples were successively colored with this method in a laboratory scale trial. The dye exhaustion (%), the color values and the color rub fastnesses were determined. Also, the grain surface and the cross-section of the leathers were analyzed before and after dyeing. As presented, it only required 5 minutes to color with this method and the dye exhaustions averaged 2.3%, helpful for the recycling of the dye solution. The color for the test group of ten leathers varied within a small range ( ?E <1) when the solution was directly recycled without dye replenishment. The color fastnesses reached as much as the 4-5 dry rub scale and 3 wet rub scale after the leathers were coated with a typical shoe upper finishing formula. Furthermore, the grain and the collagen fibers were not significantly damaged during the dyeing process as demonstrated by Scanning Electron Microscope and X-ray diffraction analysis. In summary, this clean and quick dyeing could be considered a potential option for leather dyeing. Note de contenu : - EXPERIMENTAL : Materials - experimental set-up - Leather dyeing - Analysis methods : analysis of dye exhaustion - determination of color difference : Determination of fastness to wet and dry rub - scanning electron microscopc study (SEM) - X-ray diffraction study (XRD) - RESULTS AND DISCUSSION : Dye exhaustion - color measurements and fastnesses - SEM analysis - XRD analysis. En ligne : https://drive.google.com/file/d/1CQ_v-nJ9ZzVIL7AXa72ZpxuKiLDcpZRP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11315 [article]

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Behavior of fatliquored leathers in a microwave field / Ying Gong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 2 (02/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 2 (02/2012) . - p. 60-67 Titre : Behavior of fatliquored leathers in a microwave field Type de document : texte imprimé Auteurs : Ying Gong, Auteur ; Tao Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2012 Article en page(s) : p. 60-67 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Collagène Cuir Huiles et graisses de poissons Micro-ondes Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leathers fatliquored with sulfited fish oil were irradiated with microwave at various intensities, then their physical properties and the microstructure of collagen fibers were investigated to show the roles of microwave field. As confirmed, the free and capillary moisture in leather were firstly removed by microwave radiation, accompanying with diminution in area. However, the hydrothermal stability of leather was scarcely altered. Scanning Electron Microscope images indicated that the dispersion of collagen fibers was not destroyed with microwave exposure. In addition, the characteristic D-periodicity and microstructure for the collagen were changed little as revealed by Atomic Force Microscope and X-ray Diffraction studies. Furthermore, there was some improvement in the softness of leathers because of migration of oil and its uniform distribution. These results could be helpful for understanding the roles of microwave technique in leather industry. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Microwave irradiation trials - Analyses of physical properties of leathers (measurement of temperature on leather grain - determination of face area yield (%) - Measurement of moisture content (%) - Determination of shrinkage temperature) - Measurement of softness - Characterization of collagen fibers in leathers (scanning electron microscope study - Atomic force microscope study - X-ray diffractometer study) - Characterization of fatliquors (dielectric constant study - viscosity study - determination of particle size in fatliquor solution) - RESULTS AND DISCUSSION : Physical properties - SEM analyses - AFM analyses - XRD analyses - Properties of fatliquors En ligne : https://drive.google.com/file/d/1JStobg1o40hlW2K1GoFzGut0BrHNqtWj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13571 [article]

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Preparation of antibacterial sheepskin with silver nanoparticles : potential for use as a mattress for pressure ulcer prevention / Weite Yang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 3 (03/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 3 (03/2012) . - p. 85-91 Titre : Preparation of antibacterial sheepskin with silver nanoparticles : potential for use as a mattress for pressure ulcer prevention Type de document : texte imprimé Auteurs : Weite Yang, Auteur ; Xuan Wang, Auteur ; Ying Gong, Auteur ; Li Hui, Auteur ; Wuyong Chen, Auteur ; Carmen Gaidau, Auteur Année de publication : 2012 Article en page(s) : p. 85-91 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Argent Cuirs et peaux -- Emploi en thérapeutique Cuirs et peaux de moutons Nanoparticules Peau -- Ulcères -- Prévention Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the study, sheepskin was treated with silver nanoparticles, which were prepared at the concentration of 2.4×10-2 g·L-1 with average particles size about 26 nm. And then, the adsorption of the silver nanoparticles by the sheepskin, as well as the morphology and the antibacterial effect of the treated sheepskin were investigated. The UV-vis absorption spectroscopy indicated nearly all of the silver nanoparticles were adsorbed by the sheepskin with this method. From scanning electron microscopy (SEM) observations, it was confirmed that the nanoparticles attached on the surface of the sheepskin. The antibacterial effect of the treated sheepskin was evaluated after repeated perspiration treatments. The results of antibacterial study showed that the treated sheepskin had an antibacterial inhibition of 99.9% against Escherichia coli and Staphylococcus aureus, even after 6 cycles of perspiration treatment, the sheepskin still exhibited a durable antibacterial effect with the inhibition rate above 79.4% and 67.1% respective to the leather and the wool. Thus, this study has provided an eco-friendly alternative for the preparation of antibacterial sheepskin without organic compounds, which would be potentially used as a mattress for pressure ulcer prevention. Note de contenu : - EXPERIMENTAL : Materials - Preparation of silver nanoparticles - Antimicrobial activity of the silver nanoparticles En ligne : https://drive.google.com/file/d/1IjeVq35JlVkkZUgWR5AKGpL321I1NCZx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14420 [article]

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