Documents disponibles écrits par cet auteur

Diol-functionalized imidazolium-based room-temperature ionic liquids with bis(trifluoromethanesulfonimide) anions that exhibit variable water miscibility / Andrew L. LaFrate in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8757–8759 Titre : Diol-functionalized imidazolium-based room-temperature ionic liquids with bis(trifluoromethanesulfonimide) anions that exhibit variable water miscibility Type de document : texte imprimé Auteurs : Andrew L. LaFrate, Auteur ; Jason E. Bara, Auteur ; Douglas L. Gin, Auteur Année de publication : 2010 Article en page(s) : pp. 8757–8759 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : 1-(2,3-dihydroxypropyl)-3-alkylimidazolium  Bis(trifluoromethanesulfonimide)  Room-temperature  ionic  liquids  Water  miscibility Résumé : The synthesis and characterization of a new class of 1-(2,3-dihydroxypropyl)-3-alkylimidazolium bis(trifluoromethanesulfonimide) room-temperature ionic liquids (RTILs) with tunable water miscibility are reported. The presence of a vicinal diol substituent on these RTILs allows for variable water miscibility, depending on the nature of the alkyl substituent on the cation. Water-miscible, imidazolium-based RTILs with the bis(trifluoromethanesulfonimide) anion are unprecedented. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900460r [article] Diol-functionalized imidazolium-based room-temperature ionic liquids with bis(trifluoromethanesulfonimide) anions that exhibit variable water miscibility [texte imprimé] / Andrew L. LaFrate, Auteur ; Jason E. Bara, Auteur ; Douglas L. Gin, Auteur . - 2010 . - pp. 8757–8759. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8757–8759 Mots-clés : 1-(2,3-dihydroxypropyl)-3-alkylimidazolium  Bis(trifluoromethanesulfonimide)  Room-temperature  ionic  liquids  Water  miscibility Résumé : The synthesis and characterization of a new class of 1-(2,3-dihydroxypropyl)-3-alkylimidazolium bis(trifluoromethanesulfonimide) room-temperature ionic liquids (RTILs) with tunable water miscibility are reported. The presence of a vicinal diol substituent on these RTILs allows for variable water miscibility, depending on the nature of the alkyl substituent on the cation. Water-miscible, imidazolium-based RTILs with the bis(trifluoromethanesulfonimide) anion are unprecedented. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900460r

Effect of anion on gas separation performance of polymer−room-temperature Ionic liquid composite membranes / Jason E. Bara ; Douglas L. Gin ; Richard D. Noble in Industrial & engineering chemistry research, Vol. 47 n°24 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9919–9924 Titre : Effect of anion on gas separation performance of polymer−room-temperature Ionic liquid composite membranes Type de document : texte imprimé Auteurs : Jason E. Bara, Auteur ; Douglas L. Gin, Auteur ; Richard D. Noble, Auteur Année de publication : 2009 Article en page(s) : p. 9919–9924 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas  Separation  Performance  of  Polymer  photopolymerization Résumé : Composite gas separation membranes were fabricated by photopolymerization of a room-temperature ionic liquid (RTIL) monomer in the presence of 20 mol % of nonpolymerizable RTILs with various anions. The solid, composite membranes contained polymer-bound cations, “free” cations, and “free” anions. The composite materials exhibit no phase separation between these components. The permeabilities of CO2, N2, and CH4 in these poly(RTIL)−RTIL composites were observed to increase by 2−5 times relative to those in the neat poly(RTIL) without a “free” RTIL component. These largely increased permeabilities resulted in CO2/N2 and CO2/CH4 ideal separation selectivities that were only slightly diminished relative to the poly(RTIL) without a “free” RTIL. When viewed on “Robeson plots”, poly(RTIL)−RTIL composites are shown to be more favorable for CO2/N2 separation than CO2/CH4. Poly(RTIL)−RTIL composites are highly tunable materials with excellent promise as gas separation membranes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801019x [article] Effect of anion on gas separation performance of polymer−room-temperature Ionic liquid composite membranes [texte imprimé] / Jason E. Bara, Auteur ; Douglas L. Gin, Auteur ; Richard D. Noble, Auteur . - 2009 . - p. 9919–9924. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9919–9924 Mots-clés : Gas  Separation  Performance  of  Polymer  photopolymerization Résumé : Composite gas separation membranes were fabricated by photopolymerization of a room-temperature ionic liquid (RTIL) monomer in the presence of 20 mol % of nonpolymerizable RTILs with various anions. The solid, composite membranes contained polymer-bound cations, “free” cations, and “free” anions. The composite materials exhibit no phase separation between these components. The permeabilities of CO2, N2, and CH4 in these poly(RTIL)−RTIL composites were observed to increase by 2−5 times relative to those in the neat poly(RTIL) without a “free” RTIL component. These largely increased permeabilities resulted in CO2/N2 and CO2/CH4 ideal separation selectivities that were only slightly diminished relative to the poly(RTIL) without a “free” RTIL. When viewed on “Robeson plots”, poly(RTIL)−RTIL composites are shown to be more favorable for CO2/N2 separation than CO2/CH4. Poly(RTIL)−RTIL composites are highly tunable materials with excellent promise as gas separation membranes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801019x

Effect of “free” cation substituent on gas separation performance of polymer−room-temperature Ionic liquid composite membranes / Jason E. Bara in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4607–4610 Titre : Effect of “free” cation substituent on gas separation performance of polymer−room-temperature Ionic liquid composite membranes Type de document : texte imprimé Auteurs : Jason E. Bara, Auteur ; Richard D. Noble, Auteur ; Douglas L. Gin, Auteur Année de publication : 2009 Article en page(s) : pp. 4607–4610 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Room-temperature  ionic  liquid  Imidazolium  cation  poly(RTIL)  matrix Résumé : Room-temperature ionic liquid (RTIL) based monomers were photopolymerized in the presence of nonpolymerizable RTILs with various types of organic functional groups attached to the imidazolium cation. Groups employed include alkyl, ether, nitrile, fluoroalkyl, and siloxane functionalities. This straightforward method allows for a broad range of functional groups to be incorporated into poly(RTIL) matrices without the need to develop new monomers. The resultant poly(RTIL)−RTIL composites were homogeneous, optically transparent solids that exhibited no signs of phase separation, even after many months of storage. As thin films, poly(RTIL)−RTIL composites were utilized as gas separation membranes and tested for their permeabilities to CO2, N2, and CH4. The presence of 20 mol % “free” RTIL within the poly(RTIL) matrix was shown to increase CO2 permeability by ∼100−250% relative to the neat poly(RTIL) membrane with no free RTIL component. The nature of the organic functional group associated with the free RTIL cation can influence both gas permeability and CO2/N2 and CO2/CH4 selectivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801897r [article] Effect of “free” cation substituent on gas separation performance of polymer−room-temperature Ionic liquid composite membranes [texte imprimé] / Jason E. Bara, Auteur ; Richard D. Noble, Auteur ; Douglas L. Gin, Auteur . - 2009 . - pp. 4607–4610. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4607–4610 Mots-clés : Room-temperature  ionic  liquid  Imidazolium  cation  poly(RTIL)  matrix Résumé : Room-temperature ionic liquid (RTIL) based monomers were photopolymerized in the presence of nonpolymerizable RTILs with various types of organic functional groups attached to the imidazolium cation. Groups employed include alkyl, ether, nitrile, fluoroalkyl, and siloxane functionalities. This straightforward method allows for a broad range of functional groups to be incorporated into poly(RTIL) matrices without the need to develop new monomers. The resultant poly(RTIL)−RTIL composites were homogeneous, optically transparent solids that exhibited no signs of phase separation, even after many months of storage. As thin films, poly(RTIL)−RTIL composites were utilized as gas separation membranes and tested for their permeabilities to CO2, N2, and CH4. The presence of 20 mol % “free” RTIL within the poly(RTIL) matrix was shown to increase CO2 permeability by ∼100−250% relative to the neat poly(RTIL) membrane with no free RTIL component. The nature of the organic functional group associated with the free RTIL cation can influence both gas permeability and CO2/N2 and CO2/CH4 selectivity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801897r

High water vapor flun membranes based on novel diol − imidazolium polymers / Andrew L. LaFrate in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 11914–11919 Titre : High water vapor flun membranes based on novel diol − imidazolium polymers Type de document : texte imprimé Auteurs : Andrew L. LaFrate, Auteur ; Douglas L. Gin, Auteur ; Richard D. Noble, Auteur Année de publication : 2011 Article en page(s) : pp. 11914–11919 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymers Résumé : A breathable membrane that demonstrates high water vapor flux was prepared using a diol-functionalized polymerizable room temperature ionic liquid. A novel monomer material was synthesized and used to fabricate thin films which were tested for their ability to transport water vapor. These materials were tested beside commercial breathable polymers for comparison. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100227h [article] High water vapor flun membranes based on novel diol − imidazolium polymers [texte imprimé] / Andrew L. LaFrate, Auteur ; Douglas L. Gin, Auteur ; Richard D. Noble, Auteur . - 2011 . - pp. 11914–11919. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 11914–11919 Mots-clés : Polymers Résumé : A breathable membrane that demonstrates high water vapor flux was prepared using a diol-functionalized polymerizable room temperature ionic liquid. A novel monomer material was synthesized and used to fabricate thin films which were tested for their ability to transport water vapor. These materials were tested beside commercial breathable polymers for comparison. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100227h

Room-temperature ionic liquid−amine solutions: tunable solvents for efficient and reversible capture of cO2 / Dean Camper in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8496–8498 Titre : Room-temperature ionic liquid−amine solutions: tunable solvents for efficient and reversible capture of cO2 Type de document : texte imprimé Auteurs : Dean Camper, Auteur ; Jason E. Bara, Auteur ; Douglas L. Gin, Auteur Année de publication : 2008 Article en page(s) : p. 8496–8498 Langues : Anglais (eng) Résumé : Solutions of room-temperature ionic liquids (RTILs) and commercially available amines were found to be effective for the capture of CO2 as carbamate salts. RTIL solutions containing 50 mol % (16% v/v) monoethanolamine (MEA) are capable of rapid and reversible capture of 1 mol of CO2 per 2 moles MEA to give an insoluble MEA−carbamate precipitate that helps to drive the capture reaction (as opposed to aqueous amine systems). Diethanolamine (DEA) can also be used in the same manner for CO2 capture in RTILs containing a pendant hydroxyl group. The captured CO2 in the resulting RTIL−carbamate salt mixtures can be readily released by either heating and/or subjecting them to reduced pressure. Using this unprecedented and industrially attractive mixing approach, the desirable properties of RTILs (i.e., nonvolatility, enhanced CO2 solubility, lower heat capacities) can be combined with the performance of amines for CO2 capture without the use of specially designed, functionalized “task-specific” ionic liquids. By mixing RTILs with commercial amines, reactive solvents with a wide range of amine loading levels can be tailored to capture CO2 in a variety of conditions and processes. These RTIL−amine solutions behave similarly to their water-based counterparts but may offer many advantages, including increased energy efficiency, compared to current aqueous amine technologies. [article] Room-temperature ionic liquid−amine solutions: tunable solvents for efficient and reversible capture of cO2 [texte imprimé] / Dean Camper, Auteur ; Jason E. Bara, Auteur ; Douglas L. Gin, Auteur . - 2008 . - p. 8496–8498. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8496–8498 Résumé : Solutions of room-temperature ionic liquids (RTILs) and commercially available amines were found to be effective for the capture of CO2 as carbamate salts. RTIL solutions containing 50 mol % (16% v/v) monoethanolamine (MEA) are capable of rapid and reversible capture of 1 mol of CO2 per 2 moles MEA to give an insoluble MEA−carbamate precipitate that helps to drive the capture reaction (as opposed to aqueous amine systems). Diethanolamine (DEA) can also be used in the same manner for CO2 capture in RTILs containing a pendant hydroxyl group. The captured CO2 in the resulting RTIL−carbamate salt mixtures can be readily released by either heating and/or subjecting them to reduced pressure. Using this unprecedented and industrially attractive mixing approach, the desirable properties of RTILs (i.e., nonvolatility, enhanced CO2 solubility, lower heat capacities) can be combined with the performance of amines for CO2 capture without the use of specially designed, functionalized “task-specific” ionic liquids. By mixing RTILs with commercial amines, reactive solvents with a wide range of amine loading levels can be tailored to capture CO2 in a variety of conditions and processes. These RTIL−amine solutions behave similarly to their water-based counterparts but may offer many advantages, including increased energy efficiency, compared to current aqueous amine technologies.