A5080804254- Ionic liquids properties and applications
- Conducting polymers and applications
- Chemical and Physical Properties in Aqueous Solutions
- Electrochemical Analysis and Applications
- Crystallization and Solubility Studies
- Thermodynamic properties of mixtures
- Phase Equilibria and Thermodynamics
- Advanced Battery Materials and Technologies
- Advanced Sensor and Energy Harvesting Materials
- Catalysis and Oxidation Reactions
- Chemical Thermodynamics and Molecular Structure
- Extraction and Separation Processes
- Carbon Dioxide Capture Technologies
- Surfactants and Colloidal Systems
- Dielectric materials and actuators
- Analytical Chemistry and Chromatography
- Oxidative Organic Chemistry Reactions
- Metal-Organic Frameworks: Synthesis and Applications
- X-ray Diffraction in Crystallography
- Methane Hydrates and Related Phenomena
- Radical Photochemical Reactions
- Chemistry and Chemical Engineering
- Inorganic and Organometallic Chemistry
- Chemical Synthesis and Reactions
- Catalysis for Biomass Conversion
Universidade Nova de Lisboa
2015-2024
Rede de Química e Tecnologia
2008-2024
Laboratório Associado para a Química Verde
2017-2022
University of Lisbon
2007-2022
Instituto de Tecnología Química
2010-2018
Faculdade de Tecnologia e Ciências
2017-2018
University of Alabama
2018
525 Solutions (United States)
2018
Open Ephys Production Site (Portugal)
2014-2017
Instituto Português Da Qualidade
2015
This review highlights the pyridinium salts in terms of their natural occurrence, synthesis, reactivity, biological properties, and diverse applications.
Since determining experimentally a wide variety of thermophysical properties—even for very small portion the already known room temperature ionic liquids (and their mixtures and solutions)—is an impossible goal, it is imperative that reliable predictive methods be developed. In turn, these might offer us clues to understanding underlying ion–ion ion–molecule interactions. 1-Butyl-3-methylimidazolium tetrafluoroborate, one most thoroughly investigated liquids, together with water, greenest...
Molar enthalpies of vaporization, a homologous series 1-alkyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imides, [Cnmim][NTf2], (with 2 ≤ n 8) were directly determined for the first time. The results obtained in this study emphasize and constitute clear experimental support novel concept that these liquid salts are composed polar nonpolar domains; is, they exhibit microphase segregation.
Excess molar volumes of six binary mixtures composed two ionic liquids the 1-methyl-3-alkyl-imidazolium bis(trifluoromethylsulfonyl)amide family([Cmmim] + [Cnmim])[NTf2] with n and m ranging from 2 to 10were measured for several compositions at 298 333 K. Similarly, three other systems containing [C4mim]+ (1-methyl-3-butylimidazolium) as a common cation have been studied: [C4mim]([NTf2] [PF6]), [BF4]) [C4mim]([BF4] [PF6]). Thus, mixing process distinct ions equal sign embedded in constant...
A surprising mixed solvent effect, both in its magnitude and direction, has been found the phase diagram of ternary mixture ([C4mim][PF6] + (water ethanol)). For a molar ratio 1∶1 water to ethanol, co-solvent effect near-critical demixing temperature can be as large 80 K.
Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) experiments showed that when aprotic ionic liquids vaporize under pressure and temperature conditions similar to those of a reduced-pressure distillation, the gas phase is composed discrete anion-cation pairs. The evolution spectrometric signals recorded during fractional distillations binary liquid mixtures allowed us monitor changes gas-phase composition relative volatility components. In addition, we have studied...
The current study focuses on 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF4], and hexafluorophosphate, [bmim][PF6]. objective is to the influence of pressure as well that anion several properties this type ionic liquid. speed sound densities in pure liquids (ILs) a function temperature have been determined. Several other thermodynamic such compressibilities, expansivities, heat capacities obtained. To best our knowledge, research comprises both first data evaluation at high...
For the first time, two distinct trends are clearly evidenced for enthalpies and entropies of vaporization along [Cnmim][Ntf2] ILs series. The trend shifts observed Δ(l)(g)H(m)(o) Δ(l)(g)S(m)(o), which occur at [C6mim][Ntf2], related to structural modifications. thermodynamic results reported in present article constitute quantitative experimental evidence percolation phenomenon make a significant contribution better understanding relationship among cohesive energies, volatilities, liquid...
The current study focuses on several phosphonium-based ionic liquids, namely, trihexyltetradecylphosphonium chloride, acetate, and bis{(trifluoromethyl)sulfonyl}amide. objective was to the influence of pressure as well that anion properties this type liquids. Densities in pure liquids a function temperature have been determined. Other thermodynamic properties, such isothermal compressibility, isobaric expansivity, thermal coefficient, calculated. Density measurements performed at broad range...
The influence of the cation's central atom in behavior pairs ammonium- and phosphonium-based ionic liquids was investigated through measurement densities, viscosities, melting temperatures, activity coefficients at infinite dilution, refractive indices, toxicity against Vibrio fischeri. All properties are affected by nature, with ammonium-based presenting higher enthalpies. Activity dilution show to present slightly for non-polar solvents, becoming lower polar suggesting that somewhat...
An efficient, simple, scalable and atom efficient method for the synthesis of 2,5-dihydroxymethylfuran (DHMF) 5-hydroxymethylfuranoic acid, as sodium salt (HMFA), in 80% yield from 5-hydroxymethylfurfural (HMF) water using NaOH (0.9 eq.) via a Cannizzaro reaction is described. Both building blocks DHMF HMFA were successfully isolated merely selective crystallisation.
This work reports on the development of ionic liquid (IL)/poly(vinylidene fluoride) (PVDF) actuator composites. ILs sharing same anion (bis(trifluoromethylsulfonyl)imide, [TFSI]−), and different cations belonging to families pyridinium, imidazolium, ammonium ions, comprising an alkyl side chains with variable length, were used. The physical–chemical properties, thermal behavior, mechanical, electrical, bending responses PVDF/IL composites evaluated. incorporation into PVDF matrix leads...
Liquid−liquid phase splitting in ternary mixtures that contain a room-temperature ionic liquid and an alcohol aqueous solutionnamely, [bmim][PF6] + ethanol water [bmim][NTf2] 2-methylpropanol wateris studied. Experimental cloud-point temperatures were obtained up to pressures of 400 bar, using He−Ne laser light-scattering technique. Although pressurization favors mutual miscibility the presence high concentrations alcohols, contrary occurs water-rich solutions. Both exhibit very pronounced...
The current study focuses on 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [C3mim][NTf2], and 1-pentyl-3-methylimidazolium [C5mim][NTf2]. objective is to the influence of pressure as well that cation's alkyl chain length several properties this type ionic liquids. Speed propagation ultrasound waves densities in pure liquids a function temperature have been determined. Other thermodynamic such compressibilities expansivities obtained. sound measurements carried out broad...
Lower critical solution temperatures (LCST)-type of phase diagrams, including the presence closed loops, have been encountered for first time in binary and quasi-binary liquid solutions ionic liquids. Furthermore, results constitute experimental support existence a theoretically postulated, but never encountered, special kind type VII diagram. Two distinct mechanisms are involved appearance demixing upon temperature increase. These findings underlie specific, oriented interactions between...
A successful process to extract lipolytic enzymes based on an aqueous biphasic system (ABS), which uses both ionic liquids (ILs) and a high charge-density inorganic salt (K2CO3), is proposed in this work. The activity of model Thermomyces lanuginosuslipase (TlL) some the most common hydrophilic ILs, 1-alkyl-3-methylimidazolium cation, combined with chloride, alkylsulfate, alkylsulfonate acetate, was investigated. Several operating conditions influencing lipase ABS formation were Parameters...