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Moisture sorption/desorption of collagen / Albert M. Manich in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 7 (07/2010)
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Titre : Moisture sorption/desorption of collagen Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; Fernando Maldonado, Auteur ; Josep Carilla, Auteur ; M. Catalina, Auteur ; Agusti Marsal, Auteur Année de publication : 2010 Article en page(s) : p. 229-241 Note générale : Bibliogr. Langues : Américain (ame) Tags : Sorption/désorption Collagène Cuir 'Poudre de peau' 'Sorption dynamique vapeur' 'Brunaeur Emmett and Teller' (BET) 'Guggenheim, Andersen Boer' (GAB) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Moisture sorption/desorption of two physical forms of collagen (hide powder and leather) was studied. Despite the fact that the testing of sorption/desorption behavior is time consuming, the application of a Dynamic Vapor Sorption analyzer enabled us to characterize the sorption/desorption behavior of materials in a relatively short time. Differences in sorption and desorption can be related to the accessibility and internal tortuosity of the materials. BET and GAB models were used to analyze variations in monolayer sorption capacity (internal sorption surface) of different forms of collagen (hide powder and leather). Variations in the energy constants related to primary and secondary sorption were also considered. Given that tests in desorption were performed, the BET and GAB models were also fitted to desorption and the differences observed in the parameters were analyzed. A model of sorption-desorption for porous materials was devised to account for the differences between sorption and desorption. En ligne : https://drive.google.com/file/d/1rsA4uYRuzAn7zyFwTQxNmytTwMlJYPQn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9722
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 7 (07/2010) . - p. 229-241[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012329 - Périodique Bibliothèque principale Documentaires Disponible Water management of human hair / F.-J. Wortmann in IFSCC MAGAZINE, Vol. 10, N° 4 (10-11-12/2007)
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Titre : Water management of human hair Type de document : texte imprimé Auteurs : F.-J. Wortmann, Auteur ; Alexandra Hullmann, Auteur ; Crisan Popescu, Auteur Année de publication : 2008 Article en page(s) : p. 317-320 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Traitements cosmétiques' 'Coefficient de diffusion' 'Cheveu humain' Hystérèse 'Sorption l'eau' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Temperature dependent isotherms for the water ab- and desorption of human hair were determined (25–65°C) together with the related diffusion coefficients and hysteresis effects. Special care was taken to standardize the physical history of the samples. With increasing temperature, isotherms, while preserving their shape, shift to lower regains while the hysteresis effect decreases. This is in accordance with expectations derived from the Rosenbaum-model for water sorption. The differential heat of water sorption changes from dry to wet hair between 1020 and 50 J/g H2O. Diffusion coefficients are of the order of 10-9 cm2/s. The coefficients increase with temperature and show a pronounced maximum in the range of medium regains. The temperature dependence follows the Arrhenius equation and exhibits activation energies that change from dry to wet hair between 55 and 30 kJ/mol. The sorption performance of strongly bleached hair, with and without an additional treatment with cetyltrimethylammonium bromide, was investigated. No significant effects either of the cosmetic treatment or of the ingredient were found. It is concluded that human hair exhibits a rather robust static and dynamic water sorption performance that, against initial expectations, is not readily changed by cosmetic processes and ingredients. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10414
in IFSCC MAGAZINE > Vol. 10, N° 4 (10-11-12/2007) . - p. 317-320[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 009660 - Périodique Bibliothèque principale Documentaires Disponible