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Structure, extraction, processing, and applications of collagen as an ideal component for biomaterials - a review / Qijue Chen in COLLAGEN AND LEATHER, Vol. 5 (2023)
[article]
Titre : Structure, extraction, processing, and applications of collagen as an ideal component for biomaterials - a review Type de document : texte imprimé Auteurs : Qijue Chen, Auteur ; Ying Pei, Auteur ; Keyong Tang, Auteur ; Madalina Georgiana Albu-Kaya, Auteur Année de publication : 2023 Article en page(s) : 27 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomatériaux
Collagène -- Structure
Extraction (chimie)
Systèmes auto-assemblésIndex. décimale : 574.192 Biochimie Résumé : Collagen with a multi-hierarchical architecture exhibits powerful biological performance, thus being developed in biomedical applications as a processing building block. The isolated collagen after extraction from biological tissues can be processed into various forms such as fibrils, scaffolds, membranes, microspheres, hydrogels, and sponges for further use in specific applications. This review briefly discusses the multi-hierarchical structure, powerful biological performances, extraction, and processing approaches of collagen as a natural biomaterial. The processing of collagen including dissolution, self-assembly, cross-linking, and electrospinning, is discussed to show more feasibility for specific applications of collagen composite biomaterials. Further emphasis is directed towards the biomedical applications of drug and gene delivery, as well as tissue repair involving bone, cartilage, vascular, and corneal, along with wound healing. Additionally, there is a focus on the development of flexible sensors and electronic skins (e-skins). Furthermore, the potential challenges and perspectives for the development of collagen-based biomaterials are proposed. In short, collagen-based biomaterials are expected to facilitate sustainable development and the next generation of advanced biomaterial applications. Note de contenu : - COLLAGEN SUPERFAMILLY : Collagen types - Hierarchical structure of type I collagen - Powerful biological performances of collagen - Antioxidant ability - Inhibitory activity - Antitumor activity - Anti-freeze activity - Regulating biological activities - Involving the tissue recovery
- EXTRACTION AND PROCESSING OF COLLAGEN : Extraction of collagen - Processing of collagen
- COLLAGEN-BASED BIOMEDICAL APPLICATIONS - Drug and gene delivery - Tissue repairing - Smart-healthcare devicesDOI : https://doi.org/10.1186/s42825-023-00127-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00127-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40070
in COLLAGEN AND LEATHER > Vol. 5 (2023) . - 27 p.[article]Study on the pyrolysis kinetic behaviors of different vegetable-tanned sheepskin leathers / Chaoya Ren in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 8 (08/2023)
[article]
Titre : Study on the pyrolysis kinetic behaviors of different vegetable-tanned sheepskin leathers Type de document : texte imprimé Auteurs : Chaoya Ren, Auteur ; Jie Liu, Auteur ; Fang Wang, Auteur ; Yong Lei, Auteur ; Madalina Georgiana Albu Kaya, Auteur ; Keyong Tang, Auteur Année de publication : 2023 Article en page(s) : 315-326 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Chataigne et constituants
Cinétique chimique
Cuirs et peaux de moutons
Mimosa et constituants
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
QuebrachoLe quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches.
Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ;
Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae.
Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache.
Tannage végétal
Tara et constituantsC'est un petit arbre épineux avec des gousses plates rouge qui pousse dans les zones sèches du Pérou, Amérique du Sud.
Thermodynamique
ThermogravimétrieIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The pyrolysis behaviors of leathers tanned with hydrolyzable tannins (Tara and Chestnut extracts), and condensed tannins (Quebracho and Mimosa extract) were studied by Thermogravimetric (TG) analysis in the present work. The TG/derivative thermogravimetry (DTG) results showed that the thermal stability of Tara- and Chestnut-tanned samples is poorer than that of Quebracho- and
Mimosa-tanned ones. In order to study pyrolysis kinetics, TG experiments at different heating rates were carried out. Two methods of Flynn-Wall-Ozawa (FWO) and Friedman (FR) were employed to calculate the pyrolysis activation energy (Eα) of the samples. It was found that the average Eα of the vegetable-tanned samples is located at the range of 191.7-206.1 kJ/mol. The thermodynamic parameters (pre-exponential factor, Gibbs free energy, enthalpy, and entropy) of the samples were subsequently calculated based on the average Eα by the FR method. The Gibbs free energies of the Chestnut-, Tara-, Quebracho-, and Mimosa-tanned leathers were 176.9 kJ/mol, 179.8
kJ/mol, 179.3 kJ/mol, and 178.2 kJ/mol, respectively. The difference between the average enthalpies and the Eα is less than 5 kJ/mol, which indicated that the pyrolysis process is conductive to the product formation. The mean entropy (ΔS) of the four vegetable-tanned samples is all positive, which suggested that the pyrolysis of the samples could easily take place. This work might provide theoretical guidance for the optimization of vegetable-tanned leather waste pyrolysis.Note de contenu : - EXPERIMENTAL : Sample preparation and characterization - Thermogravimetric analysis (TGA) - Pyrolysis kinetic analysis - Thermodynamic parameters
- RESULTS AND DISCUSSION : Characterization of different tanned leather samples - TG/DTG - Pyrolysis kinetic analysis
- Table 1 : Pyrolysis activation energy (Ea, KJ/mol) by methods of FWO and FR for the samples
- Table 2 : Pre-exponential factor (A, min-1) by the FR methods of Chestnut-, tara-, quebracho-, and mimosa-tanned samplesDOI : https://doi.org/10.34314/jalca.v118i8.8089 En ligne : https://drive.google.com/file/d/1YeArkaONnsVeLI4LB7rdB6epyEjy_Tb-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39671
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Code-barres Cote Support Localisation Section Disponibilité 24134 - Périodique Bibliothèque principale Documentaires Disponible Study on the stress-relaxation behaviour of nappa upper pig leather / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 6 (11-12/2008)
[article]
Titre : Study on the stress-relaxation behaviour of nappa upper pig leather Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Zhang Chunhui, Auteur ; Fang Wang, Auteur ; Wu Dacheng, Auteur Année de publication : 2008 Article en page(s) : p. 262-266 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir nappa
Cuirs et peaux de porcs
Relaxation des contraintes
RhéologieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Nappa upper pig leathers have been popular because shoes made from them give a very comfortable feeling to the wearer. From the viewpoint of stress-relaxation behaviour, the viscoelasticity of nappa upper pig leathers was studied and is reported in this paper.
A model with four Maxwell models connected in parallel is put forward, which had been used to describe the stress-relaxation behaviour of nappa upper pig leathers successfully. The correlation coefficients between model prediction and actual behaviour are very close to 1 which means that the simulation is reliable. The comfort of leather shoes is also discussed in relation to the stress-relaxation model.Note de contenu : - INTRODUCTION : Theoretical principle
- EXPERIMENTAL PROCEDURES : Materials and apparatus - Procedures
- RESULTS AND DISCUSSION : Stress-relaxation behaviour of nappa upper pig leathers - Model simulation of stress-relaxation behaviour of nappa upper pig leathers - Rheological constants of the model
- Table 1 : Correlation coefficient (R2) of curves fitting with different models
- Table 2 : Measurement and calculation of stress-relaxation modulus of sample perpendicular to the backbone (n = 4)
- Table 3 : Measurement and calculation of stress-relaxation modulus of sample parallel to the backbone (n = 4)
- Table 4 : Rheological constants of the stress-relaxation model (n = 4)En ligne : https://drive.google.com/file/d/1pbDat2-5nC6FRyDnFYsycY-x5_d_Obgw/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38997
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 6 (11-12/2008) . - p. 262-266[article]Thermal shrinkage effects on the mechanical behavior of leathers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)
[article]
Titre : Thermal shrinkage effects on the mechanical behavior of leathers Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Dominick J. Casadonte, Auteur ; Xuejing Zheng, Auteur ; Pengxiang Jia, Auteur ; Dennis C. Shelly, Auteur Année de publication : 2010 Article en page(s) : p. 94-99 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Thermal shrinkage will take place when leathers are heated to a high temperature, usually resulting in a decrease in its value and utility. In this paper, changes in mechanical behavior by thermal shrinkage of leathers are studied systematically for the first time, and the influencing mechanism of thermal shrinkage on the mechanical behaviors of leathers are investigated and analyzed. The results indicate that, by thermal shrinkage, the aperture ratios of leathers are decreased and such mechanical properties of leathers as elastic modulus, tensile strength, and elongation at break are increased. The improvement in mechanical behaviors by hydrothermal shrinkage is at the cost of loss of utility and economic value of leathers. The results indicate that shrunken leather may have a host of new applications because of their excellent mechanical behavior. En ligne : https://drive.google.com/file/d/1sjBf-VkgfBN_tLGI1ODfnNk76RaLpUfg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8734
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Code-barres Cote Support Localisation Section Disponibilité 012029 - Périodique Bibliothèque principale Documentaires Disponible Thermogravimetric analysis and pyrolysis kinetics of tannery wastes in an inert atmosphere / Lan Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 4 (04/2020)
[article]
Titre : Thermogravimetric analysis and pyrolysis kinetics of tannery wastes in an inert atmosphere Type de document : texte imprimé Auteurs : Lan Luo, Auteur ; Cheng-Kung Liu, Auteur ; Eleanor M. Brown, Auteur ; Fang Wang, Auteur ; Yadi Hu, Auteur ; Keyong Tang, Auteur Année de publication : 2020 Article en page(s) : p. 123-131 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cinétique chimique
Cuirs et peaux de moutons
Laine
Laine -- Déchets
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Tannage -- Déchets
ThermogravimétrieIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Industrial wastes generated from tanneries contain large quantities of water-insoluble proteins, which may be used for the production of composite materials, renewable chemicals and energy. In this work, the pyrolysis kinetics of powdered sheep fur wastes (SFW) was studied by thermogravimetry (TG) at different heating rates from room temperature to 600°C in nitrogen atmosphere. TG results revealed that there are three stages in this process. The overall apparent activation energy (E) in the main pyrolysis stage was determined to be 275.6 kJ mol-1 by modified Kissinger-Akahira-Sunose (MKAS) method. Because the pyrolysis of SFW could not be described by a single-step reaction, the experimental DTG curve of SFW was deconvoluted into three individual peaks followed by reconstruction of TG curves corresponding to three pseudo components. The average values of E obtained for these pseudo components are 234.7 kJ mol-1, 176.4 kJ mol-1, and 186.2 kJ mol-1, respectively. Generalized master-plots method indicated that the SFW pyrolysis may follow the random nucleation and growth mechanism (Avrami-Erofeev model). Reaction model functions f(α) for these pseudo components could be expressed as: f(α)=3.1(1-α)[-ln(1-α)]0.67; f(α)=3.6(1-α)[-ln(1-α)]0.72, and f(α)=3.9(1-α)[-ln(1-α)]0.74, respectively. These results may provide insight for further studies as well as for future application of pyrolysis technology for tannery wastes. Note de contenu : - EXPERIMENTAL : Materials - Thermogravimetric analysis (TGA) - Thermal analysis kinetics - Isoconversional methods - Generalized master plots method
- RESULTS AND DISCUSSION : TG/DTG curves of SFW - TG/DTG curves of leather and wool - Deconvolution method - Determination of the activation energy - Master-plots analysisDOI : https://doi.org/10.34314/jalca.v115i4.3798 En ligne : https://drive.google.com/file/d/1Vg__iKYgMSDLBMSaTmMfe5aSqe5fpTw6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34157
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