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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CXV, N° 6Mention de date : 06/2020Paru le : 16/07/2020 |
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Ajouter le résultat dans votre panierEco-friendly leather dyeing using ultrasound technique / Mohamed Abu Sayid Mia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 6 (06/2020)
[article]
Titre : Eco-friendly leather dyeing using ultrasound technique Type de document : texte imprimé Auteurs : Mohamed Abu Sayid Mia, Auteur ; Refat E. Ashraf, Auteur ; Mohammad Nurnabi, Auteur ; Mohamed Zahnagir Alam, Auteur Année de publication : 2020 Article en page(s) : p. 199-206 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Caractérisation
Coefficient de diffusionUn 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 -- Absorption
Colorants acides
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux -- Teinture
Essais de résilience
Essais dynamiques
Microscopie électronique à balayage
Morphologie (matériaux)
Noir (couleur)
Résistance à l'abrasion
Résistance à la traction
Résistance à la transpiration
Rouge (couleur)
Thermogravimétrie
UltrasonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, leather was dyed using ultrasound and conventional methods to investigate the influence of ultrasound on leather dyeing. Ultrasound is more effective than mechanical agitation in enhancing leather dyeing. Effects of various process parameters, such as, dyeing temperature, dyeing time and doses of dye on dyeing of leather in presence of ultrasound were investigated. Dyed leathers were characterized with scanning electron microscopy (SEM), photomicrographic analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), etc. It was observed that percentage exhaustion of dye, dye uptake, dye penetration and diffusion coefficient were increased significantly in presence of ultrasound compared to those of dyeing in absence of ultrasound. Moreover, physical properties of the dyed leathers were also investigated. Color rub fastness, perspiration, tensile strength, etc. of dyed leather in presence of ultrasound were higher than that of without ultrasound. SEM analyses of the surface and cross section of the dyed leather showed that fiber structure was not affected by ultrasound. Photomicrographic analysis of cross-section of the dyed leather also showed a deeper penetration of dye in presence of ultrasound. Consequently, dye content in the spent liquor was decreased resulting in a lower environmental pollution. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Dyeing of leather - Analysis of dye uptake and exhaustion - Characterization of dyed leather
- RESULTS AND DISCUSSION : FT-IR analysis of dyes used in this study - Effect of time on dye uptake of leather - Percentage exhaustion of dye - Photomicrographic analysis of dyed leather - Diffusion coefficient - Morphology analysis - Thermogravimetric analysis of dyed leather - Differential scanning calorimetric analysis of dyed leather - Physical properties of the dyed leathers - Environmental benefitsDOI : https://doi.org/10.34314/jalca.v115i6.3819 En ligne : https://drive.google.com/file/d/1oiP6QwmmA5m9OWcokk8xFuzodx5sP63r/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34321
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Code-barres Cote Support Localisation Section Disponibilité 21821 - Périodique Bibliothèque principale Documentaires Disponible Preparation and properties of nano-ZnO/organic fluorine modified polyacrylate finishing agent / Sui Zhihui in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 6 (06/2020)
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Titre : Preparation and properties of nano-ZnO/organic fluorine modified polyacrylate finishing agent Type de document : texte imprimé Auteurs : Sui Zhihui, Auteur ; San Jinglong, Auteur ; Xuedong Wu, Auteur ; Jingbin Zhang, Auteur ; Lingfang Sun, Auteur Année de publication : 2020 Article en page(s) : p. 207-214 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Cuirs et peaux -- Finition
Cuirs et peaux -- Propriétés mécaniques
Essais de résilience
Essais dynamiques
Fluor
Fourier, Spectroscopie infrarouge à transformée de
Humidité -- Absorption:Eau -- Absorption
Latex
Nanoparticules
Oxyde de zinc
Polyacrylates
Potentiel zeta
Résistance à la déchirure
Spectroscopie de photoélectronsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A nano-ZnO/organic fluorine-modified polyacrylate leather finishing agent was prepared using a mixture of a Silyl-modified nano-ZnO, dodecafluoroheptyl methacrylate (DFMA), methyl methacrylate (MMA) and butyl acrylate (BA) as raw materials. A semi-continuous seeded emulsion polymerization followed. The overall research objective was to improve the bacteriostatic, hydrophobicity and anti-aging properties of leather articles. The structure of the composite emulsion and its film were characterized and analyzed by FT-IR, TEM and XPS. The results showed that the latex particles had an obvious core-shell structure, a smooth surface and were monodisperse. The particle size of the emulsion ranged between 30 and 50 nm. The average value of Zeta potential was -40.1 mV which signified a good emulsion stability. The composite emulsion and its film had good UV resistance and water resistance. When the content of organic fluorine in the film was a maximum 20 %, the contact angle of a water drop on the finished leather, tensile strength and tear strength were 133.48°, 620 N and 61 N, respectively. When the content of nano-ZnO in the film was 1.0%, the average width of antibacterial band of finished leather was 2.1 mm. The finished leather also demonstrated a good anti-aging property. Note de contenu : - MATERIALS AND METHODS : Materials - Modification of nano-ZnO - Preparation of nano-ZnO/organic fluorine-modified polyacrylate emulsion - Finishing process of leather
- CHARACTERIZATION AND PERFORMANCE MEASUREMENTS : Fourier transform infrared spectra (FT-IR) analysis - Particle size and zeta potential of composite emulsion - Morphology of latex particles (TEM) - XPS analysis of latex film surface - Water absorption measurement of latex film - UV resistance measurement of composite emulsion - EDS-mapping analysis of finished leather - The contact angle measurement of leather to water - Measurement of application properties
- RESULTS AND DISCUSSION : FT-IR analysis - Particle size distribution and zeta potential of emulsion - Morphological analysis of emulsion partifles - XPS analysis of latex film - Water absorption of latex film - UV transmittance of composite emulsion - EDS analysis of leather surface - Bacteriostatic property of the finished leather - Contact angle of leather to water - Strength test of leather - Anti-aging test of leather - Physical performanceDOI : https://doi.org/10.34314/jalca.v115i6.3823 En ligne : https://drive.google.com/file/d/1zvX5ebHIRemL_rlmmM5UMHqq_IBQQ7dE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34322
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Code-barres Cote Support Localisation Section Disponibilité 21821 - Périodique Bibliothèque principale Documentaires Disponible Pine tannin extraction from residues of pine forest exploitation / Mireia Conde in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 6 (06/2020)
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Titre : Pine tannin extraction from residues of pine forest exploitation Type de document : texte imprimé Auteurs : Mireia Conde, Auteur ; Felipe Combalia, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur Année de publication : 2020 Article en page(s) : p. 215-221 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
Biomasse
Bois -- Déchets
Caractérisation
Chimie analytique
Chromatographie
Déchets organiques -- Recyclage
Ecorces
Extraction (chimie)
Pins et constituants
Recyclage (déchets, etc.)
Tanins végétauxIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The main aim of this study is to use the vegetable extract obtained from the residues of pine forest exploitation as a source of tannins that, acting both as a tanning and retanning agent, can replace other vegetable extracts and chrome in leather tanning. The study thus proposes a bio resource more sustainable to use in tanning process that avoids the use of chemical products that are detrimental to our health and can have an impact on the biodegradable nature of the final tanned leather. Furthermore, in addition to the benefits of using a new, fully biodegradable tanning material (Biodegradability of vegetable tanned leather is poor than chrome tanned leather), this is a locally sourced product, which allows the carbon footprint to be notably reduced (Vegetable tanning contributes more carbon foot print than chrome tanning). Additionally, it should be possible to add value to forestry residues over a short period of time, which would undoubtedly contribute to improving forest management in Spain and would also be beneficial in many ways. Note de contenu : - EXPERIMENTAL : Collection of residual forest biomass - Physical modification - Chemical analysis
- RESULTS AND DISCUSSION : Initial analysis of tanning agents of the by-products - Physical modification of by-products - Physical characterization of the bark - Characterization of tannins in pine by-products by HPLC-UVDOI : https://doi.org/10.34314/jalca.v115i6.3821 En ligne : https://drive.google.com/file/d/1kaPjaufGo4eVp1r8r_Z4p1goLoIx9sCG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34323
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Code-barres Cote Support Localisation Section Disponibilité 21821 - Périodique Bibliothèque principale Documentaires Disponible Efficacy of usnea sp. extracts in preventing biofilm formation by bacillus species isolated from soaking liquor samples / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 6 (06/2020)
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Titre : Efficacy of usnea sp. extracts in preventing biofilm formation by bacillus species isolated from soaking liquor samples Type de document : texte imprimé Auteurs : Didem Berber, Auteur ; Ipek Türkmenoglu, Auteur ; Meral Birbir, Auteur ; Nüzhet Cenk Sesal, Auteur Année de publication : 2020 Article en page(s) : p. 222-229 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens
Bactériologie
Biofilms
Cuirs et peaux -- Conservation
Lichens et constituants
StatistiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bacteria forms biofilm to be resistant to antibacterial agents and other unfavorable environment as compared to planktonic bacterial cells. Due to resistance of bacterial biofilms to commonly used antimicrobial agents and adverse effects of these biofilms in different industries, potential natural compounds which can inhibit bacterial biofilms have attracted more attention in recent years. Lichens are known to have unique secondary metabolites with various biological activities including anti-biofilm properties. Therefore, Bacillus toyonensis, Bacillus mojavensis, Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus velezensis, Bacillus cereus, and Bacillus licheniformis, isolated from soak liquor samples in the previous study, were tested for their ability to form biofilm in this study. Biofilm-forming Bacillus species were detected as B. subtilis, B. amyloliquefaciens, and B. velezensis. The anti-biofilm effect of the acetone extracts of Usnea sp. was evaluated at various concentrations against these biofilm-forming isolates. The anti-biofilm effect of acetone extracts of Usnea sp. against B. subtilis and B. amyloliquefaciens was observed at the concentration of 5 µg/mL by inhibition ratios of 62.75% and 72.72%, respectively. In addition, biofilm formation of B. velezensis was inhibited by the treatment with 1.25 µg/mL extracts at a 62.69% inhibition rate. Biofilm formations of B. amyloliquefaciens and B. velezensis were also suppressed by the extracts at varying percentages of inhibition ranging between 10.11-43.69% and 21.25-46.35%, respectively. This study may provide an alternative approach to overcome the biofilm formation and bacterial resistance to the antibacterial agents in the leather industry. Note de contenu : - Lichen samples - Extraction of lichen samples
- Bacterial strains
- Screening of biofilm forming bacillus species from soak liquor samples
- Anti-biofilm effect of Usnea sp. acetone extracts against B. subtilis, B. amyloloquefaciens, and B. velezensis
- Statistical analysesDOI : https://doi.org/10.34314/jalca.v115i6.3820 En ligne : https://drive.google.com/file/d/1LpFnBpiI--C9xwpicxfMDPWnYNnYH8wf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34324
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21821 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |