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Exploring structural features of bovine, ovine, fish, poultry, reptile, amphibian, and porcine skins through scanning electron microscopy / R. Karthikeyan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 5 (05/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 5 (05/2024) . - p. 207-214 Titre : Exploring structural features of bovine, ovine, fish, poultry, reptile, amphibian, and porcine skins through scanning electron microscopy : insights for material science and sustainable design Type de document : texte imprimé Auteurs : R. Karthikeyan, Auteur ; Zerihun Teshome, Auteur ; Tamrat Tesfaye, Auteur Année de publication : 2024 Article en page(s) : p. 207-214 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux de bovins Cuirs et peaux de grenouilles Cuirs et peaux de moutons Cuirs et peaux de Poissons Cuirs et peaux de porcs Cuirs et peaux de volailles Microscopie électronique à balayage Topographie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In leather research, the Scanning Electron Microscope (SEM) proves to be an invaluable tool, offering detailed and high-resolution images of both the surface and fiber structure. This information plays a critical role in optimizing manufacturing processes within the leather industry, enhancing the quality of leather products, and contributing to the development of new materials. In the current study, our focus is on unraveling the microscopic details of skins sourced from various biological origins. We aim to provide insights into the distinctive morphological features, fiber arrangements, and surface topographies of bovine, ovine, fish, poultry, reptile, amphibian, and porcine skins, which were converted into crust leathers. We captured microphotographs of the surfaces and crosssections of the leathers through scanning electron microscopy analysis. This paper presents a comprehensive comparison and discussion of the findings, seeking to identify key differences and similarities. Such a comparative analysis contributes to our understanding of material science, fashion, and sustainable design, offering potential implications for these diverse fields. Note de contenu : - EXPERIMENTAL : Materials - Material preparation for structural investigation - SEM study of crust leathers - RESULTS AND DISCUSSION : Structural characterization of bovine and ovine leathers - Structural characterization of fish leathers - Structural characterization of poultry leathers - Structural characterization of reptile leathers - Structural characterization of pig and frog leathers DOI : https://doi.org/10.34314/81027s27 En ligne : https://drive.google.com/file/d/1Oim8_1wTCHXPbPbVq0vW4wSjFodtarqe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40974 [article]

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Potential for using cattle hair from hair-saving tanneries as adsorbent for crude oil / Xiang-Shuang Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 5 (05/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 5 (05/2024) . - p. 215-221 Titre : Potential for using cattle hair from hair-saving tanneries as adsorbent for crude oil Type de document : texte imprimé Auteurs : Xiang-Shuang Wang, Auteur ; He-Wei Ma, Auteur ; Ying-Jie Gu, Auteur ; Hao-Cheng Zhu, Auteur ; Yi-Jing Yu, Auteur Année de publication : 2024 Article en page(s) : p. 215-221 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbants et adsorbants Cuirs et peaux de bovins Déversements de pétrole Milieu marin -- Pollution -- Lutte contre Poils -- Recyclage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The oil cleanup potential of discarded cattle hair from tannery operations was investigated by batch adsorption experiments using two crude oils with different viscosities. The results illustrate that cattle hair exhibits higher adsorption capacity for crude oil with higher viscosity. The sorbent can adsorb 5 to 6 times its weight in the two crude oils. Maximum adsorption capacity of 8.72 g/g at 18°C is achieved with pulverized hair powder, and it is comparable to human hair. The sorption can fit better to Freundlich adsorption isotherm and shows the adsorption occurred on heterogeneous sites with a non-uniform distribution of energy. Desorption and reusability experiments confirmed reusability without significant reduction in sorption capacity. This investigation indicates that discarded cattle hair has potential as a low-cost and effective biosorbent for scavenging crude oil spillage. Note de contenu : - EXPERIMENTAL : Reagents and materials - Modification of the cattle hairs - Fiber surface morphology observation - Adsorption experiments - Effects of time on adsorption - Effects of particle size on adsorption - Effects of adsorbent dose on adsorption - Sorption isotherm study - Reusability test - RESULTS AND DISCUSSION : Morphology of the hair - Effects of time on adsorption - Effects of particle size on adsorption capacity - Effects of adsorbent dose on adsorption capacity - Adsorption isotherms - Reusability of cattle hair sorbent DOI : https://doi.org/10.34314/7j9ger77 En ligne : https://drive.google.com/file/d/17hfJhYr2wcA0E0BHZLhqQiQjB5dN8vPa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40975 [article]

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A concept on biodegradability of fatliquors / Bindia Sahu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 5 (05/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 5 (05/2024) . - p. 222-230 Titre : A concept on biodegradability of fatliquors : A sustainable and cleaner leather processing Type de document : texte imprimé Auteurs : Bindia Sahu, Auteur ; Indrasis Das, Auteur ; Akash Bhalla, Auteur ; Ravi Banothu, Auteur Année de publication : 2024 Article en page(s) : p. 222-230 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Caractérisation Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Huile de ricin et constituants Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The biodegradability of a fatliquor is an important parameter to consider in leather processing as it is critical to obtain an easily treatable waste effluent leading towards a more sustainable and cleaner environment. Fatliquor biodegradability depends upon the functional groups (double bond or hydroxyl) present in the oil after chemical modification, the level and ratio of functional groups impact the degree of biodegradability. In the present investigation, the chemical modification of castor oil was achieved via the sulfation method by varying the level of concentrated sulfuric acid H2SO4 (17 to 19 ml per 100 gm of castor oil) is tested for fatliquoring properties against a control (Turkey Red Oil). The sample treated with 17 ml concentrated H2SO4 shows better biodegradability than the other samples. The FTIR, particle size and zeta potential analysis of experimental fatliquors and morphological and physical strength (tensile strength, and elongation) characterization of the experimental leathers are comparable to the standard values. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of sulphated castor oil fatliquor with varying concentration of sulfuric acid - Characterization of fatliquor Particle size analysis of fatliquor - FTIR analysis of fatliquor - Biodegradability test of fatliquors - Fatliquor Application in post-tanning operation - Scanning Electron Microscopic (SEM) analysis - Physical strength characteristics and organoleptic properties of leather - Effect of fatliquor on the germination of Vigna radiata L. Wilcze - RESULTS AND DISCUSSION : Fatliquor particle size and zeta potential analysis - FTIR analysis of fatliquors - Biodegradability test - Effect of spent fat liquors on the germination of vigna radiata L. Wilcze and stem length of sprouts - Scanning Electron Microscopic (SEM) analysis - Physical strength characteristics and organoleptic properties of leather - - Table 1 : Nomenclature of the experimental fatliquors - Table 2 : Process recipe for fatliquoring - Table 3 : BOD/COD of different fat liquor samples - Table 4 : Sprout growth of experimental samples of Vigna radiata L. Wilcze - Table 5 : Physical properties of the leather processed by as-synthesized fatliquors DOI : https://doi.org/10.34314/9b3hbh38 En ligne : https://drive.google.com/file/d/1O7Xzg6VPgerGzmkLZInb3ybTKLxVwXVy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40976 [article]

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Bisphenol reduction in syntans and examples for extraction and migration of bisphenols from leather articles / Jochen Ammenn in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 5 (05/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 5 (05/2024) Titre : Bisphenol reduction in syntans and examples for extraction and migration of bisphenols from leather articles Type de document : texte imprimé Auteurs : Jochen Ammenn, Auteur Année de publication : 2024 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bisphénol F Bisphénol S Cuir Extraction (chimie) Produits chimiques -- Consommation -- Réduction Produits chimiques -- Migration Retannage Syntans Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Bisphenol S and F play a major role in the synthesis of syntans. Bisphenol S can be a starting material or undesired side product, while bisphenol F can form as an undesired side product. They can be found in basically all syntans in a range from close to the detection limit up to several thousand parts per million and can be detected in most leather articles by extraction or by migration. In an initiative by the European Chemicals Agency (ECHA) to drastically reduce bisphenols in consumer goods and in the environment, challenging limits were proposed in 2022. These limits would have had a strong impact on syntan portfolios of the leather chemical manufacturers and on many leather articles. After a public a consultation, ECHA has temporarily withdrawn the restriction proposal and wants to re-work it. Examples for reductions of both bisphenols in leather chemicals and the impact on extractions and migration from leather articles down to detection limits will be outlined in this article. Note de contenu : - Examples of bisphenol reductions in syntans - Extraction results of bisphenols from re-tanned leather - Migration results of bisphenols from leather re-tanned with syntans 2 and 2.LB - Table 1 : BPS and BPF in syntan 1 - Table 2 : Extraction from leathers made with 3 types of syntan 1 in re-tanning (6%) - Table 3 : Repeated extraction from leathers made with 6% syntan 1 in re-tanning - Table 4 : Extraction results from leathers made with phenolic syntan 2 and 3 in re-tanning ; values measured internal, as well as at the FILK (Freiberg) and PFI (Pirmasens) institutes - Table 5 : Results of BosC’s migration from leathers made with phenolic syntan 2 and 2.LB measured at PFI institute DOI : https://doi.org/10.34314/40d3q167 En ligne : https://drive.google.com/file/d/1W9ngTDzNHLbfF6xxpUF863GJD47DTsIk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40977 [article]

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