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Fabrication and characterization of PLLA /chitosan / nano calcium phosphate scaffolds by freeze - casting technique / Mahboubeh Jafarkhani in Industrial & engineering chemistry research, Vol. 51 N° 27 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 27 (Juillet 2012) . - pp. 9241-9249 Titre : Fabrication and characterization of PLLA /chitosan / nano calcium phosphate scaffolds by freeze - casting technique Type de document : texte imprimé Auteurs : Mahboubeh Jafarkhani, Auteur ; Alireza Fazlali, Auteur ; Fathollah Moztarzadeh, Auteur Année de publication : 2012 Article en page(s) : pp. 9241-9249 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Casting Résumé : In this research, nanocomposite scaffolds of chitosan/PLLA/nano calcium phosphate (average crystallite size of 16.5 nm) have been prepared via the freeze-casting method and then characterized. The effects of nano powder contents on the structure of scaffolds were investigated to provide an appropriate nanocomposite for bone tissue engineering applications. The results showed that the scaffolds had high porosity (up to 98%) with open pores of 80-380 μm in diameter. It was also shown that the porosity increased with decreasing nano powder content. Furthermore, the bioactive nano calcium phosphate was homogenously distributed within the polymeric matrix of scaffolds, which contained up to 40% of nano powder. Microstructure studies showed that the pores were distributed very well throughout the structures. This macropores structure with interconnected pores provides the properties of scaffolds required for bone tissue engineering applications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26132260 [article] Fabrication and characterization of PLLA /chitosan / nano calcium phosphate scaffolds by freeze - casting technique [texte imprimé] / Mahboubeh Jafarkhani, Auteur ; Alireza Fazlali, Auteur ; Fathollah Moztarzadeh, Auteur . - 2012 . - pp. 9241-9249. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 27 (Juillet 2012) . - pp. 9241-9249 Mots-clés : Casting Résumé : In this research, nanocomposite scaffolds of chitosan/PLLA/nano calcium phosphate (average crystallite size of 16.5 nm) have been prepared via the freeze-casting method and then characterized. The effects of nano powder contents on the structure of scaffolds were investigated to provide an appropriate nanocomposite for bone tissue engineering applications. The results showed that the scaffolds had high porosity (up to 98%) with open pores of 80-380 μm in diameter. It was also shown that the porosity increased with decreasing nano powder content. Furthermore, the bioactive nano calcium phosphate was homogenously distributed within the polymeric matrix of scaffolds, which contained up to 40% of nano powder. Microstructure studies showed that the pores were distributed very well throughout the structures. This macropores structure with interconnected pores provides the properties of scaffolds required for bone tissue engineering applications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26132260

Thermodynamic model for the prediction of equilibrium conditions of clathrate hydrates of methane + water-soluble or -insoluble hydrate former / Mohammad Illbeigi in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9437–9450 Titre : Thermodynamic model for the prediction of equilibrium conditions of clathrate hydrates of methane + water-soluble or -insoluble hydrate former Type de document : texte imprimé Auteurs : Mohammad Illbeigi, Auteur ; Alireza Fazlali, Auteur ; Amir H. Mohammadi, Auteur Année de publication : 2011 Article en page(s) : pp. 9437–9450 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Thermodynamic  Hydrates  of  methane Résumé : In this communication, equilibrium conditions of clathrate hydrates of cyclopentane, cylcohexane, acetone, or 1,4-dioxane + methane, which form structure II, and 1,1-dimethylcyclohexane, 2,2-dimethylpentane, methylcyclohexane, or cis-1,2-dimethylcyclohexane + methane, which form structure H, are modeled. The thermodynamic model is based on the van der Waals–Platteeuw solid solution theory combined with an equation of state and activity model. The Peng–Robinson (PR) and Soave–Redlich–Kwong (SRK) equations of state with random mixing rules are used to model the gas phase, while the UNIFAC method is used to model the liquid phase(s). It is shown that the use of the PR equation of state leads to better predictions of hydrate equilibrium conditions of the aforementioned water-insoluble heavy hydrocarbons, while the use of the SRK equation of state causes better predictions of hydrate equilibrium conditions of the latter water-soluble hydrate formers. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200442h [article] Thermodynamic model for the prediction of equilibrium conditions of clathrate hydrates of methane + water-soluble or -insoluble hydrate former [texte imprimé] / Mohammad Illbeigi, Auteur ; Alireza Fazlali, Auteur ; Amir H. Mohammadi, Auteur . - 2011 . - pp. 9437–9450. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9437–9450 Mots-clés : Thermodynamic  Hydrates  of  methane Résumé : In this communication, equilibrium conditions of clathrate hydrates of cyclopentane, cylcohexane, acetone, or 1,4-dioxane + methane, which form structure II, and 1,1-dimethylcyclohexane, 2,2-dimethylpentane, methylcyclohexane, or cis-1,2-dimethylcyclohexane + methane, which form structure H, are modeled. The thermodynamic model is based on the van der Waals–Platteeuw solid solution theory combined with an equation of state and activity model. The Peng–Robinson (PR) and Soave–Redlich–Kwong (SRK) equations of state with random mixing rules are used to model the gas phase, while the UNIFAC method is used to model the liquid phase(s). It is shown that the use of the PR equation of state leads to better predictions of hydrate equilibrium conditions of the aforementioned water-insoluble heavy hydrocarbons, while the use of the SRK equation of state causes better predictions of hydrate equilibrium conditions of the latter water-soluble hydrate formers. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200442h