Documents disponibles écrits par cet auteur

Block copolymer micelles formed in supercritical fluid can become water-dispensable nanoparticles / Zachary Tyrrell in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1928–1932 Titre : Block copolymer micelles formed in supercritical fluid can become water-dispensable nanoparticles : poly(ethylene glycol)-block-poly(ϵ-caprolactone) in trifluoromethane Type de document : texte imprimé Auteurs : Zachary Tyrrell, Auteur ; Winoto Winoto, Auteur ; Youqing Shen, Auteur Année de publication : 2009 Article en page(s) : pp. 1928–1932 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Micelles  Poly(ethylene  glycol)−block  Poly(ϵ-caprolactone)Supercritical  fluid  solvent  Water-dispensable  formulation Résumé : Micelles of hydrophilic−hydrophobic block polymers, such as poly(ethylene glycol)−block-poly(ϵ-caprolactone) (PEG−b-PCL), used as drug-delivery carriers, are generally fabricated via solvent displacement or dialysis, which is time-consuming, requires freeze drying, and can leave toxic traces of the residual organic solvents. An alternative is presented in this paper: form micellar PEG−b-PCL nanoparticles in a supercritical fluid solvent and then disperse them in water toward a water-dispensable formulation. This method is illustrated with pressure−temperature phase diagrams for PEG−b-PCL in supercritical trifluoromethane, which is selective enough for the PCL and PEG blocks to induce micellization. When subjected to decompression to remove trifluoromethane, dry and organic solvent-free nanoparticles are readily obtained. Their micellar structure is immediately reestablished in water, as confirmed by laser light scattering. Neither has been demonstrated previously. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801472n [article] Block copolymer micelles formed in supercritical fluid can become water-dispensable nanoparticles : poly(ethylene glycol)-block-poly(ϵ-caprolactone) in trifluoromethane [texte imprimé] / Zachary Tyrrell, Auteur ; Winoto Winoto, Auteur ; Youqing Shen, Auteur . - 2009 . - pp. 1928–1932. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1928–1932 Mots-clés : Micelles  Poly(ethylene  glycol)−block  Poly(ϵ-caprolactone)Supercritical  fluid  solvent  Water-dispensable  formulation Résumé : Micelles of hydrophilic−hydrophobic block polymers, such as poly(ethylene glycol)−block-poly(ϵ-caprolactone) (PEG−b-PCL), used as drug-delivery carriers, are generally fabricated via solvent displacement or dialysis, which is time-consuming, requires freeze drying, and can leave toxic traces of the residual organic solvents. An alternative is presented in this paper: form micellar PEG−b-PCL nanoparticles in a supercritical fluid solvent and then disperse them in water toward a water-dispensable formulation. This method is illustrated with pressure−temperature phase diagrams for PEG−b-PCL in supercritical trifluoromethane, which is selective enough for the PCL and PEG blocks to induce micellization. When subjected to decompression to remove trifluoromethane, dry and organic solvent-free nanoparticles are readily obtained. Their micellar structure is immediately reestablished in water, as confirmed by laser light scattering. Neither has been demonstrated previously. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801472n

Isothermal carbon dioxide sorption in poly(ionic liquid)s / Jianbin Tang in Industrial & engineering chemistry research, Vol. 48 N° 20 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. 9113–9118 Titre : Isothermal carbon dioxide sorption in poly(ionic liquid)s Type de document : texte imprimé Auteurs : Jianbin Tang, Auteur ; Youqing Shen, Auteur ; Maciej Radosz, Auteur Année de publication : 2010 Article en page(s) : pp. 9113–9118 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Poly(ionic  liquid)s  CO2  Isothermal  sorption Résumé : The low-pressure isothermal sorption of CO2 in poly(ionic liquid)s (PILs) with varied structures including different cations, anions, backbones, and substituents was investigated to probe structure effects on the CO2 sorption. An ammonium cation with short alkyl group, BF4 anion, and polystyrene backbone was found to favor CO2 sorption in PILs. CO2 sorption in the PILs fitted the dual-mode model very well, suggesting that the CO2 sorption consists of dissolution in the polymer matrix and Langmuir sorption in the microvoids. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900292p [article] Isothermal carbon dioxide sorption in poly(ionic liquid)s [texte imprimé] / Jianbin Tang, Auteur ; Youqing Shen, Auteur ; Maciej Radosz, Auteur . - 2010 . - pp. 9113–9118. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. 9113–9118 Mots-clés : Poly(ionic  liquid)s  CO2  Isothermal  sorption Résumé : The low-pressure isothermal sorption of CO2 in poly(ionic liquid)s (PILs) with varied structures including different cations, anions, backbones, and substituents was investigated to probe structure effects on the CO2 sorption. An ammonium cation with short alkyl group, BF4 anion, and polystyrene backbone was found to favor CO2 sorption in PILs. CO2 sorption in the PILs fitted the dual-mode model very well, suggesting that the CO2 sorption consists of dissolution in the polymer matrix and Langmuir sorption in the microvoids. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900292p