11 documents found, page 1 of 2
Enhanced dissolution of chitin using acidic deep eutectic solvents: a sustainab...
Bisht, Meena; Macário, Inês P. E.; Neves, Márcia C.; Pereira, Joana L.; Pandey, Siddharth; Rogers, Robin D.; Coutinho, João A. P.; Ventura, Sónia P. M.Chitin is a natural biomass resource with high potential for a wide variety of applications. However, it remains poorly explored because of its solubility issues. In this work, a large range of acidic deep eutectic solvents (aDESs), combining different hydrogen bond acceptors [betaine (Bet), urea (U), and cholinium chloride (CC)] and hydrogen bond donors [formic acid (FA), acetic acid (AA) propanoic acid (PA), ...
Double salt ionic liquids prepared by mixing partially miscible ionic liquids: ...
Wang, Hui; Pereira, Jorge F.B. [UNESP]; Myerson, Allan S.; Rogers, Robin D.Made available in DSpace on 2018-12-11T16:38:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-01; Massachusetts Institute of Technology; Double Salt Ionic Liquids (DSILs) were prepared by mixing 1- ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][NTf<inf>2</inf>]) and trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide ([P<inf>66614</inf>][NTf<inf>2</inf>]) in their...
Odd-even effect on the formation of aqueous biphasic systems formed by 1-alkyl-...
Belchior, Diana C. V.; Sintra, Tânia E.; Carvalho, Pedro J.; Soromenho, Mário R. C.; Esperança, José M. S. S.; Ventura, Sónia P. M.; Rogers, Robin D.This work provides a comprehensive evaluation of the effect of the cation alkyl side chain length of the 1-alkyl-3-methylimidazolium chloride series ([CnC1im]Cl, n = 2-14) of ionic liquids (ILs) on their capability to form aqueous biphasic systems (ABSs) with salts and self-aggregation derived properties. The liquid-liquid phase behavior of ternary systems composed of [CnC1im]Cl, water, and K3PO4 or K2CO3 and t...
Temperature dependency of aqueous biphasic systems: an alternative approach for...
E Silva, Francisca A.; Pereira, Jorge F. B.; Kurnia, Kiki A.; Ventura, Sónia P. M.; Silva, Artur M. S.; Rogers, Robin D.; Coutinho, João A. P.Herein we propose an alternative way to distinguish ionic liquids from Coulombic-dominated salts, based not on their upper limit melting temperature (100 °C), but on the trend of their phase-forming abilities to create aqueous biphasic systems as a function of temperature, in which a wider plethora of interactions can be appraised.
A critical assessment of the mechanisms governing the formation of aqueous biph...
Cláudio, Ana Filipa M.; Pereira, Jorge F. B.; McCrary, Parker D.; Freire, Mara G.; Coutinho, João A. P.; Rogers, Robin D.An extensive study on the formation of aqueous biphasic systems (ABS) using aqueous solutions of protic ionic liquids (PILs) and polyethylene glycol (PEG) was performed in order to understand the mechanisms underlying the phase separation. Aqueous solutions of PEG polymers with different molecular weights (600, 1000, 2000, and 3400 g mol{\textminus}1) and several N-alkyl-, dialkyl-, and trialkyl-ammonium salts ...
A critical assessment of the mechanisms governing the formation of aqueous biph...
Claudio, Ana Filipa M.; Pereira, Jorge F. B.; McCrary, Parker D.; Freire, Mara G.; Coutinho, Joao A. P.; Rogers, Robin D.An extensive study on the formation of aqueous biphasic systems (ABS) using aqueous solutions of protic ionic liquids (PILs) and polyethylene glycol (PEG) was performed in order to understand the mechanisms underlying the phase separation. Aqueous solutions of PEG polymers with different molecular weights (600, 1000, 2000, and 3400 g mol(-1)) and several N-alkyl-, dialkyl-, and trialkyl-ammonium salts of acetat...
Controlling the Formation of Ionic-Liquid-based Aqueous Biphasic Systems by Cha...
Pereira, Jorge F. B.; Kurnia, Kiki A.; Freire, Mara G.; Coutinho, Joao A. P.; Rogers, Robin D.The formation of aqueous biphasic systems (ABS) when mixing aqueous solutions of polyethylene glycol (PEG) and an ionic liquid (IL) can be controlled by modifying the hydrogen-bond-donating/-accepting ability of the polymer end groups. It is shown that the miscibility/immiscibility in these systems stems from both the solvation of the ether groups in the oxygen chain and the ability of the PEG terminal groups t...
\"Washing-out\" ionic liquids from polyethylene glycol to form aqueous biphasic...
Tome, Luciana I. N.; Pereira, Jorge F. B.; Rogers, Robin D.; Freire, Mara G.; Gomes, Jose R. B.; Coutinho, Joao A. P.The molecular-level mechanisms behind the formation of aqueous biphasic systems (ABS) composed of ionic liquids (ILs) and polymers are hitherto not completely understood. For the first time, it is herein shown that polymer-IL-based ABS are a result of a ``washing-out'' phenomenon, and not of a salting-out effect of the IL over the polymer as assumed in the past few years. Novel evidence is herein provided by ex...
Molecular interactions in aqueous biphasic systems composed of polyethylene gly...
Pereira, Jorge F. B.; Kurnia, Kiki A.; Cojocaru, O. Andreea; Gurau, Gabriela; Rebelo, Luis Paulo N.; Rogers, Robin D.; Freire, Mara G.The relative ability of cholinium-([Ch](+))-based salts, including ionic liquids (ILs), to form biocompatible aqueous biphasic systems (ABS) with polyethylene glycols (PEGs) was deeply scrutinized in this work. Aqueous solutions of low molecular weight PEG polymers (400, 600, and 1000 g mol(-1)) and [Ch](+) salts of chloride, acetate, bicarbonate, glycolate, lactate, dihydrogenphosphate, dihydrogencitrate, and ...
Evidence for the Interactions Occurring Between Ionic Liquids and Tetraethylene...
Tome, Luciana I. N.; Pereira, Jorge F. B.; Rogers, Robin D.; Freire, Mara G.; Gomes, Jose R. B.; Coutinho, Joao A. P.The well-recognized advantageous properties of poly(ethylene glycol)s (PEGs) and ionic liquids (ILs) in the context of an increasing demand for safe and efficient biotechnological processes has led to a growing interest in the study of their combinations for a wide range of procedures within the framework of green chemistry. Recently, one of the most promising and attractive applications has been the novel IL/p...