[article]
| Titre : |
Composition and structural analysis of organic acid masked aluminum tanning solutions using 27Al NMR |
| Type de document : |
texte imprimé |
| Auteurs : |
Keyi Ding, Auteur ; J. Liu, Auteur ; T. Zhang, Auteur |
| Année de publication : |
2006 |
| Article en page(s) : |
p. 381-387 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
In this study, 27Al NMR was applied to gain information about the composition distributions and the structures of organic acid masked aluminum complexes in tanning solutions. The result indicated that in the pH range of aluminum tanning condition, three classes of organic acid masked aluminum complexes were found, i.e.: mononuclear complexes, linear polymeric complexes containing 2 - 4 Al3+ and "Al13 like" complexes. The predominated species was the "Al13 like" complexes, with more than 70% of the Al3+ in this state when the solution pH was ≥ 3.5. "Al13 like" complexes have a stiff spherically symmetrical structure (e-Keggin structure), consisting of one central [AlO4]5- tetrahedron, and surrounded with 9 - 30 octahedral aluminum complexes sharing edges. The diameter of a "Al13 like" complex is about 8 - 16 A. The understanding about the special structure of "Al13 like" complexes gives a rational explanation as to why in organic acid masked aluminum complex solutions, most of the added organic acid anions were in "free" state. The results of this study provide a basis for better understanding the mechanism of aluminum tannage or aluminum combination tannage with other tanning agents.. |
| En ligne : |
https://drive.google.com/file/d/1a6f4XJs-9jvLyOe4sl_Si3DvJVUdShxF/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3968 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 11 (11/2006) . - p. 381-387
[article]
|
Aller sur edunet
Accueil
Composition and structural analysis of organic acid masked aluminum tanning solutions using 27Al NMR in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 11 (11/2006)
