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Extraction of vanillin using ionic-liquid-based aqueous two-phase systems
Cláudio, Ana Filipa M.; Freire, Mara G.; Freire, Carmen S.R.; Silvestre, Armando J.D.; Coutinho, João A.P.To explore proper extractive solvents and to design an optimized separation process it is highly imperative to understand the molecular-based phenomena governing the solutes partitioning. Moreover, the development of new techniques for the biomolecules separation and purification, while maintaining their functional characteristics unchanged, is still ongoing. Therefore, in this work, the partition coefficients ...
Surface hydrophobization of bacterial and vegetable cellulose fibers using ioni...
Tomé, Liliana C.; Freire, Mara G.; Rebelo, Luís Paulo N.; Silvestre, Armando J. D.; Carlos Pascoal Neto; Marrucho, Isabel M.; Freire, Carmen S. R.The surface hydrophobization through heterogeneous chemical modification of bacterial (and vegetable) cellulose fibers with several anhydrides (acetic, butyric, hexanoic and alkenyl succinic anhydrides) and hexanoyl chloride suspended in an ionic liquid, tetradecyltrihexylphosphonium bis(trifluoromethylsulfonyl) imide, [TDTHP][NTf(2)], was studied. Furthermore, in the reaction with hexanoyl chloride, another io...
Electrospun nanosized cellulose fibers using ionic liquids at room temperature
Freire, Mara G.; Teles, Ana Rita R.; Ferreira, Rute A. S.; Carlos, Luís D.; Lopes-da-Silva, José A.; Coutinho, João A. P.Aiming at replacing the noxious solvents commonly employed, ionic-liquid-based solvents have been recently explored as novel non-volatile and non-flammable media for the electrospinning of polymers. In this work, nanosized and biodegradable cellulose fibers were obtained by electrospinning at room temperature using a pure ionic liquid or a binary mixture of two selected ionic liquids. The electrospinning of 8 w...
Densities and Derived Thermodynamic Properties of Imidazolium-, Pyridinium-, Py...
Gardas, Ramesh L.; Costa, Henrique F.; Freire, Mara G.; Carvalho, Pedro J.; Marrucho, Isabel M.; Fonseca, Isabel M. A.; Ferreira, Abel G. M.In the present work, experimental density measurements are reported along with the derived thermodynamic properties, such as the isothermal compressibility (κT), the isobaric expansivity (αp), and the thermal pressure coefficient (γv) for imidazolium-, pyridinium-, pyrrolidinium-, and piperidinium-based ionic liquids (ILs), namely, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate [C2mim][CF3SO3], 3-methyl-...
Measurements and Correlation of High-Pressure Densities of Imidazolium-Based Io...
Tomé, Luciana I. N.; Carvalho, Pedro J.; Freire, Mara G.; Marrucho, Isabel M.; Fonseca, Isabel M. A.; Ferreira, Abel G. M.; Coutinho, João A. P.In the present work, experimental density measurements are reported along with the derived thermodynamic properties, such as the isothermal compressibility (κT), the isobaric expansivity (αp), and the thermal pressure coefficient (γv) for imidazolium-based ionic liquids (ILs), namely, 1-ethyl-3-methylimidazolium methylsulfate [C2mim][MeSO4], 1-ethyl-3-methylimidazolium ethylsulfate [C2mim][EtSO4], 1,3-diethylim...
High-Pressure Densities and Derived Thermodynamic Properties of Imidazolium-Bas...
Gardas, Ramesh L.; Freire, Mara G.; Carvalho, Pedro J.; Marrucho, Isabel M.; Fonseca, Isabel M. A.; Ferreira, Abel G. M.; Coutinho, João A. P.This work addresses the experimental measurements of the pressure (0.10 < p/MPa < 10.0) and temperature (293.15 < T/K < 393.15) dependence of the density and derived thermodynamic properties, such as the isothermal compressibility, the isobaric expansivity, the thermal pressure coefficient, and the pressure dependence of the heat capacity of several imidazolium-based ionic liquids (ILs), namely, 1-butyl-3-methy...
PρT Measurements of Imidazolium-Based Ionic Liquids
Gardas, Ramesh L.; Freire, Mara G.; Carvalho, Pedro J.; Marrucho, Isabel M.; Fonseca, Isabel M. A.; Ferreira, Abel G. M.; Coutinho, João A. P.Experimental density measurements are reported, and the derived thermodynamic properties, such as the isothermal compressibility, the isobaric expansivity, and the thermal pressure coefficient are presented as Supporting Information for several imidazolium-based ionic liquids (ILs), namely, 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [C2mim][NTf2], 1-heptyl-3-methyl-imidazolium bis(trifluorom...
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