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Structural analysis of naproxen - intercalated bentonite (Unye) / A. Tabak in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 281–288 Titre : Structural analysis of naproxen - intercalated bentonite (Unye) Type de document : texte imprimé Auteurs : A. Tabak, Auteur ; N. Yilmaz, Auteur ; E. Eren, Auteur Année de publication : 2012 Article en page(s) : pp. 281–288 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Naproxen  Unye-bentonite  XRD  FTIR  TG/DTA/DSC  Surface  area Résumé : The difference in the basal spacing (8.79 Å) and a higher mass loss (6.2%) in the temperature range of 200–750 °C of naproxen-bentonite (N-bentonite) comparing to that of Unye bentonite (UB) signified the existence of thermally stable organic species in the interlamellar space of the bentonite clay. The asymmetric OCO− stretching band (1607 cm−1) of N-bentonite became stronger in the temperature interval of 100–400 °C as a result of binding via the Cdouble bond; length as m-dashO group of the ligand to exchangeable cation and/or water molecule whereas the OH bending peak of water (1633 cm−1) and the Cdouble bond; length as m-dashC stretching vibration of aromatic ring (1531 cm−1) became weaker on thermal treatment. The effect of ionic strength on the desorption of naproxen species and the related kinetic data revealed that the release mechanism at pH = 7.4 is unrestricted diffusion controlled and governed by the repulsive interactions between the bentonite surface and the negatively charged species. The pore structure characteristics of the bentonite samples corresponding to the surface area, pore volume and pore size were determined by using the conventional analysis of the nitrogen adsorption–desorption isotherms. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010850 [article] Structural analysis of naproxen - intercalated bentonite (Unye) [texte imprimé] / A. Tabak, Auteur ; N. Yilmaz, Auteur ; E. Eren, Auteur . - 2012 . - pp. 281–288. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp. 281–288 Mots-clés : Naproxen  Unye-bentonite  XRD  FTIR  TG/DTA/DSC  Surface  area Résumé : The difference in the basal spacing (8.79 Å) and a higher mass loss (6.2%) in the temperature range of 200–750 °C of naproxen-bentonite (N-bentonite) comparing to that of Unye bentonite (UB) signified the existence of thermally stable organic species in the interlamellar space of the bentonite clay. The asymmetric OCO− stretching band (1607 cm−1) of N-bentonite became stronger in the temperature interval of 100–400 °C as a result of binding via the Cdouble bond; length as m-dashO group of the ligand to exchangeable cation and/or water molecule whereas the OH bending peak of water (1633 cm−1) and the Cdouble bond; length as m-dashC stretching vibration of aromatic ring (1531 cm−1) became weaker on thermal treatment. The effect of ionic strength on the desorption of naproxen species and the related kinetic data revealed that the release mechanism at pH = 7.4 is unrestricted diffusion controlled and governed by the repulsive interactions between the bentonite surface and the negatively charged species. The pore structure characteristics of the bentonite samples corresponding to the surface area, pore volume and pore size were determined by using the conventional analysis of the nitrogen adsorption–desorption isotherms. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010850