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CO2 Separation from flue gas using polyvinyl-(room temperature ionic liquid)–room temperature ionic liquid composite membranes / Pei Li 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. 9344-9353 Titre : CO2 Separation from flue gas using polyvinyl-(room temperature ionic liquid)–room temperature ionic liquid composite membranes Type de document : texte imprimé Auteurs : Pei Li, Auteur ; K. P. Pramoda, Auteur ; Tai-Shung Chung, Auteur Année de publication : 2011 Article en page(s) : pp. 9344-9353 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Composite  material  Ionic  liquid  Gaseous  effluent  Carbon  dioxide Résumé : In this work, a vinyl-fonctionalized room temperature ionic liquid (RTIL), 1-vinyl-3-butylimidazolium bis-(trifluoromethylsulfonyl)imide ([vbim][Tf2N]), has been successfully synthesized. The RTIL was further polymerized and mixed with 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) to form the free-standing poly([vbim]-[Tf2N])-[bmim][Tf2N] composite films. The compositions of [bmim] [Tf2N] in the composite membranes were designed at 15, 30, 45, and 60 wt %. The pristine poly([vbim][Tf2N]) and poly([vbim][Tf2N])-[bmim][Tf2N] composite membranes exhibit similar permeability selectivities as the standard [bmim][Tf2N] but permeabilities are enhanced up to 5 times higher than the equivalent polystyrene-RTIL and polyacrylate-RTIL membranes. An increase in [bmim][Tf2N] concentration of poly([vbim]-[Tf2N])-[bmim][Tf2N] composite membranes results in an increase in solubility, diffusivity, and permeability coefficients of CO2 and N2 but does not change the CO2/N2 selectivities of the solubility, diffusivity, and permeability. The CO2 permeability of the 60 wt % composite at 35°C, 10 atm is 559 barrers in pure gas tests which is closer to 60% of the [bmim][Tf2N] permeability (i.e., 1344 barrers). In addition, the 60 wt % composite membrane exhibits a CO2 permeability of 491.2 barrers and a CO2/N2 selectivity of 20 in mixed gas tests using CO2/N2 (50:50) as the feed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395879 [article] CO2 Separation from flue gas using polyvinyl-(room temperature ionic liquid)–room temperature ionic liquid composite membranes [texte imprimé] / Pei Li, Auteur ; K. P. Pramoda, Auteur ; Tai-Shung Chung, Auteur . - 2011 . - pp. 9344-9353. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9344-9353 Mots-clés : Composite  material  Ionic  liquid  Gaseous  effluent  Carbon  dioxide Résumé : In this work, a vinyl-fonctionalized room temperature ionic liquid (RTIL), 1-vinyl-3-butylimidazolium bis-(trifluoromethylsulfonyl)imide ([vbim][Tf2N]), has been successfully synthesized. The RTIL was further polymerized and mixed with 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) to form the free-standing poly([vbim]-[Tf2N])-[bmim][Tf2N] composite films. The compositions of [bmim] [Tf2N] in the composite membranes were designed at 15, 30, 45, and 60 wt %. The pristine poly([vbim][Tf2N]) and poly([vbim][Tf2N])-[bmim][Tf2N] composite membranes exhibit similar permeability selectivities as the standard [bmim][Tf2N] but permeabilities are enhanced up to 5 times higher than the equivalent polystyrene-RTIL and polyacrylate-RTIL membranes. An increase in [bmim][Tf2N] concentration of poly([vbim]-[Tf2N])-[bmim][Tf2N] composite membranes results in an increase in solubility, diffusivity, and permeability coefficients of CO2 and N2 but does not change the CO2/N2 selectivities of the solubility, diffusivity, and permeability. The CO2 permeability of the 60 wt % composite at 35°C, 10 atm is 559 barrers in pure gas tests which is closer to 60% of the [bmim][Tf2N] permeability (i.e., 1344 barrers). In addition, the 60 wt % composite membrane exhibits a CO2 permeability of 491.2 barrers and a CO2/N2 selectivity of 20 in mixed gas tests using CO2/N2 (50:50) as the feed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395879

Fe3O4/poly(N-Isopropylacrylamide)/chitosan composite microspheres with multiresponsive properties / Pei Li in Industrial & engineering chemistry research, Vol. 47 N°20 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7700-7706 Titre : Fe3O4/poly(N-Isopropylacrylamide)/chitosan composite microspheres with multiresponsive properties Type de document : texte imprimé Auteurs : Pei Li, Auteur ; Ai Mei Zhu, Auteur ; Qing Lin Liu, Auteur ; Qiu Gen Zhang, Auteur Année de publication : 2008 Article en page(s) : P. 7700-7706 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Multiresponsive  Fourier  transform  infrared  spectroscopy  (FTIR)  X-ray  diffraction  (XRD)  Thermogravimetric  analysis  (TGA)  Scanning  electron  microscopy  (SEM)  Transmission  electronic  microscopy  (TEM) Résumé : Multiresponsive composite microspheres were fabricated via emulsion polymerization in two steps. Fe3O4 nanoparticles modified by oleic acid (about 13 nm in diameter) were first prepared, and then they were embedded in biocompatible chitosan (CS) and N-isopropylacrylamide (NIPAm). Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) examined the structure and morphology of the composite microspheres. Scanning electron microscopy (SEM) and transmission electronic microscopy (TEM) indicate the diameter of the composite microspheres to be about 400 nm. The magnetic, thermo, and pH-sensitive properties of the composite microspheres were investigated. Magnetic measurements with magnet and superconducting quantum interference device (SQUID) reveal that the composite microspheres are superparamagnetic. The electromagnetically induced heating shows that the composite microspheres could be heated up to 45 °C in an alternating electromagnetic field. The dynamic light scattering (DLS) results confirm the thermoresponsive and pH-responsive properties. It was found that the lower critical solution temperature (LCST) of the composite microspheres is 29 °C in water, and the LCST changed from 28 to 32 °C in the pH range from 4.7 to 7.4. These composite microspheres with the multiresponsive properties show great promise in biomedical applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800824q [article] Fe3O4/poly(N-Isopropylacrylamide)/chitosan composite microspheres with multiresponsive properties [texte imprimé] / Pei Li, Auteur ; Ai Mei Zhu, Auteur ; Qing Lin Liu, Auteur ; Qiu Gen Zhang, Auteur . - 2008 . - P. 7700-7706. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°20 (Octobre 2008) . - P. 7700-7706 Mots-clés : Multiresponsive  Fourier  transform  infrared  spectroscopy  (FTIR)  X-ray  diffraction  (XRD)  Thermogravimetric  analysis  (TGA)  Scanning  electron  microscopy  (SEM)  Transmission  electronic  microscopy  (TEM) Résumé : Multiresponsive composite microspheres were fabricated via emulsion polymerization in two steps. Fe3O4 nanoparticles modified by oleic acid (about 13 nm in diameter) were first prepared, and then they were embedded in biocompatible chitosan (CS) and N-isopropylacrylamide (NIPAm). Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) examined the structure and morphology of the composite microspheres. Scanning electron microscopy (SEM) and transmission electronic microscopy (TEM) indicate the diameter of the composite microspheres to be about 400 nm. The magnetic, thermo, and pH-sensitive properties of the composite microspheres were investigated. Magnetic measurements with magnet and superconducting quantum interference device (SQUID) reveal that the composite microspheres are superparamagnetic. The electromagnetically induced heating shows that the composite microspheres could be heated up to 45 °C in an alternating electromagnetic field. The dynamic light scattering (DLS) results confirm the thermoresponsive and pH-responsive properties. It was found that the lower critical solution temperature (LCST) of the composite microspheres is 29 °C in water, and the LCST changed from 28 to 32 °C in the pH range from 4.7 to 7.4. These composite microspheres with the multiresponsive properties show great promise in biomedical applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800824q