Air permeability and moisture penetration performance of leather from a microscopic view / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 30-32 Titre : Air permeability and moisture penetration performance of leather from a microscopic view Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Jiang Xuewei, Auteur ; Liu Jiajun, Auteur ; Xu Wei, Auteur Année de publication : 2015 Article en page(s) : p. 30-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène -- Détérioration Cuirs et peaux -- Analyse Cuirs et peaux -- Détérioration Microscopie Perméabilité Simulation par ordinateur Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, the microscopic spatial structure change of natural leather collagen Ill (i.e. 1bkv collagen) was simulated using Tinker software. The dynamics of the process for 1bkv [amino acid sequence number of Type III collagen] collagen was simulated at 300K, 320K, 340K and 360K, Through a series of analyses we find that Rg (radius of gyration) of all of the atoms of 1bkv collagen molecules increases with the increase of chosen temperature, and its average value decreases from 24.9Ã… to 21.0Ã…. Considering this along with the simulation trajectory of dynamics at different temperatures, people can find that the molecular chains of collagen gradually will become curved, and there's a large degree of bending at 360K. This is further evidence that the atomic distance between collagen molecules is getting smaller with the increase of the experimental set temperature, and it can also explain the mechanism of performance degradation of natural leather. Note de contenu : - EXPERIMENTAL PRINCIPLE - EXPERIMENTAL TOOLS - RESULTS AND DISCUSSION : Change with time of 1bkv collagen's value of Rg for all the atoms at different temperatures - The trajectory of 1bkv collagen at different temperatures En ligne : https://drive.google.com/file/d/1r-Il8X57OmRFYR_VvW63MCguMFHZyfl4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23231 [article]

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Effect of temperature on moisture-penetrability and breathability of natural leather from microstructure / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 6 (11-12/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 6 (11-12/2017) . - p. 280-283 Titre : Effect of temperature on moisture-penetrability and breathability of natural leather from microstructure Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Nian Liu, Auteur ; Jiang Xuewei, Auteur ; Xu Wei, Auteur Année de publication : 2017 Article en page(s) : p. 280-283 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Effets de la température Cuirs et peaux -- Propriétés thermomécaniques Humidité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This article utilizes the Tinker software to simulate the microspatial structure of type III collagen (1bkv) in natural leather. The four simulation environment temperatures were set at 300K, 320K, 340K, 360K te analyse the relevant trend of variation of coordination number (CN) and interatomic distance (Dis) and the number of interatomic distance (Dis No) of the lbkv collagen whole atom at the different temperatures. The results shows that with the increase of temperature the CN increases tao. As the CN value of 1bkv collagen increased gradually from 125 to 350, the floating frequency of Dis No increases with the increase of simulation time. But 0.5-0.6ns is the inflection lime et simulation. When the temperature increased to 360K, the corresponding Dis No obviously increased while, when the temperature is less than 360K, the change of Dis No is not obvious. This phenomenon shows that temperature is an important factor which affects the Dis No of collagen molecules. The increase of temperature makes the inner spatial structure of collagen molecules become smaller, which explains that, as the temperature rises to a certain value, the naturel leather's moisture-penetrability and breathability decreases. Note de contenu : - The variation tendency of CN of 1bkv collagenmolecules at different temperatures - The change trend of Dis No of 1bkv collagen molecules at the simulation temperature En ligne : https://drive.google.com/file/d/1i7WpvOrKlj6sBwd8SCe_e-YCvjntKbmn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29659 [article]

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Natural leather protein's thermal stability at high temperature conditions : analyzed by AMBER software / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 5 (09-10/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 5 (09-10/2016) . - p. 238-240 Titre : Natural leather protein's thermal stability at high temperature conditions : analyzed by AMBER software Type de document : texte imprimé Auteurs : Zhong Anhua, Auteur ; Wan Luo, Auteur ; Jiang Xuewei, Auteur ; Hu Yuqin, Auteur ; Jinjin Li, Auteur Année de publication : 2016 Article en page(s) : p. 238-240 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène Cuirs et peaux -- Analyse Hautes températures Stabilité thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, the model of a molecule of 1cgd collagen at high temperature was built using AMBER software. The software condition was set with 99 Amber force field, free boundary and Canonical ensemble (NVT), the time step as 1 femtosecond. The simulation indicates that the spatial conformation changes with rising temperature. The stability of collagen decreases and the spatial configuration deviation from the native conformation increases when the temperature rises. The structure of collagen I tends to be looser as the temperature increases and the contacts between protein molecules fall. The simulation also shows that, the more contacts between molecules, the better stability of the structure and the lower molecule activity. The decline of intermolecular hydrogen causes the decline of collagen I stability. In this paper, the thermal stability of natural leather was analyzed from the microscopic view which is helpful for understanding the changes of leather proteinis performance under high temperature. Note de contenu : - Trajectory analysis of 1cgd collagen under different temperatures - The contact number (Cn) analysis En ligne : https://drive.google.com/file/d/1r-1TAaKVj7OtHzq-yX2PaGftSX4kyQG4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27087 [article]

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Thermal stability of leather from a microscopic view / Zhong Anhua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 3 (05-06/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 3 (05-06/2013) . - p. 121-124 Titre : Thermal stability of leather from a microscopic view Type de document : texte imprimé Auteurs : Zhong Anhua ; Jiang Xuewei ; Hu Yuqin ; Du Cong Année de publication : 2013 Article en page(s) : p. 121-124 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène Cuirs et peaux -- Analyse Dynamique moléculaire Molécules -- Modèles Stabilité thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this article molecular dynamics simulations were adopted to establish the molecular model of lcgd type I collagen at different temperatures with TINKER software. Through the diagrams of the RMSD value variation curve and corresponding time trajectory sampling of the molecular model, we could see that type I collagen's stability decreased and its structure changed with the temperature rising and it is found that the higher the temperature was, the more apparent the structure changed. For example, RMSD value reached 5A at 380K, conformational space turned to an intermediate folded bending condition which is different from its natural state. Thus, we provided a new and efficient way of researching the natural leather's thermal stability. En ligne : https://drive.google.com/file/d/1jITTPUyVs2DHY0TMCEoPsoy_91AMlAWt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18841 [article]

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