A5080045055- Thermodynamic properties of mixtures
- Phase Equilibria and Thermodynamics
- Chemical and Physical Properties in Aqueous Solutions
- Ionic liquids properties and applications
- Chemical Thermodynamics and Molecular Structure
- Surfactants and Colloidal Systems
- Spectroscopy and Quantum Chemical Studies
- Photochemistry and Electron Transfer Studies
- Molecular spectroscopy and chirality
- Crystallization and Solubility Studies
- Carbon Dioxide Capture Technologies
- Analytical Chemistry and Chromatography
- Electrochemical Analysis and Applications
- Free Radicals and Antioxidants
- Advanced Thermodynamics and Statistical Mechanics
- Catalysis and Oxidation Reactions
- Gas Dynamics and Kinetic Theory
- Diffusion Coefficients in Liquids
- Advanced Chemical Physics Studies
- Atmospheric Ozone and Climate
- Inorganic and Organometallic Chemistry
- Photoreceptor and optogenetics research
- Inorganic Fluorides and Related Compounds
University of Lisbon
2016-2025
Instituto Politécnico de Lisboa
2016
Rede de Química e Tecnologia
2016
Faculdade de Tecnologia e Ciências
2016
Abstract An innovative approach is presented to interpret the refractive index of binary liquid mixtures. The concept “before mixing” introduced and shown be given by volume‐fraction mixing rule pure‐component indices (Arago–Biot formula). thermodynamically ideal mixtures demonstrated squared (Newton This theoretical formulation entails a positive change upon mixing, which interpreted in terms dissimilar London dispersion forces centred molecules making up mixture. For real mixtures, excess...
One of the most used methods for capturing acidic gases from atmosphere is use amines that react with acids and can later be recovered. The choice are efficient in has been subject several studies; however, energy effort their regeneration also important. While polarity solvent plays a critical role determining which efficiently capture CO2, heat capacity significant factor process. In this work, we present values Reichardt’s ETN30 Kamlet−Taft parameters, such as π*...
Mutual diffusion coefficients for 2-(diethylamino)ethanol (2) in water (1) were experimentally obtained by the Taylor dispersion technique from x2 = 0 to ≈ 0.2, at T 298 K and 303 K. Viscosities surface tensions measured entire composition range using capillary viscometry ring tensiometry, respectively. above temperatures, intervals of 5 temperature (283 303) Information about intermolecular interactions, hydration modes, solute aggregation is provided through combined study observed changes...
The polarity of the ionic liquids [N4111][Tf2N], [N4441][Tf2N], and [choline][Tf2N], as well their binary mixtures with ethanol has been investigated using solvatochromic dyes expressed in terms Reichardt parameter, ETN, Kamlet–Taft parameters (π*, α, β), at 298.15 K. synergetic behavior revealed essentially by + [N4441][Tf2N] system for acidity solvent shows potential importance this media some chemical applications. Even though preferential solvation model Bosch co-workers applied...
Thermophysical properties of 1-butyl-3-methylimidazoliumtris(pentafluoroethyl) trifluorophosphate, [C4mim][(C2F5)3PF3] (CAS RN 917762-91-5) ionic liquid, were measured in the temperature range T = (283.15–353.15) K, at P 0.1 MPa. These include density, isobaric heat capacity, speed sound, refractive index, viscosity, and thermal conductivity their correlation as a function temperature. Data obtained compared with available literature, whenever available. Comparison these results those...
A comprehensive formalism is developed to treat thermodynamically speed of ultrasound data for solutions and liquid mixtures. For solutions, the apparent a solute introduced proposed take place empirically defined quantities. The partial related molar volume isentropic compression. mixtures, concept sound before mixing pure liquids presented used define change in upon ideal mixing, which predicted be generally negative quantity. new thermodynamic equation derived linking values excess...
The properties of mixtures ionic liquids and water are very important for many applications. One key application is their use as absorbents in absorption refrigeration cycles, replacing + LIBr ammonia systems. As a possible mixture, the system [Bmpyr][dca] H2O was studied, available data scarce. Measurements density, speed sound, viscosity, surface tension were made seven molar compositions between 288.15 K 333.15 K. uncertainty density values 0.07 kg·m–3, while that sound found to be 0.3...
Apparent molal volumes, [Formula: see text], of secondary and tertiary amines linear hydrocarbons were determined in benzene at 25 °C, using a vibrating tube densimeter. These quantities have been extrapolated to infinite dilution obtain partial volumes. The contribution volume the amine groups, calculated simple additive scheme, interpreted terms conformational effects present these molecules. A first attempt find measure specific interaction amine–benzene was made. results agree well two...
Accurate density values, at ambient pressure, were obtained in aqueous binary mixtures of 2-ethylaminoethanol (EEA) over the whole composition range intervals 5 K temperature between 283.15 and 303.15 K. To gain some insight into several aggregation patterns present these mixtures, calculation excess molar volumes mixture, apparent partial both components made entire ranges. Thermal expansibility effects on this amphiphile/water mixture are analysed terms isobaric expansions EEP,m for...
Limiting dipole moments of four isomeric alkoxyalcohols dissolved in cyclohexane at 298.15 K were determined from measurements the relative permittivity least 17 dilute solutions up to solute mole fraction 0.03. In addition, 5 7 data points obtained a 0.1. A stepwise dilution device ensured dielectric be performed highly with accurately concentrations. Densities these and refractive indices pure liquids independently measured. calculated using Hedestrand's equation an improved method...
Ionic liquids with the dicyanamide anion, namely, 1-alkyl-imidazolium cations have been receiving attention recently due to their potential applications. The utilization of these as heat-transfer fluids, specifically in small heat exchangers and microchannels for microprocessor cooling, is presently deemed highly feasible, it can be both more efficient environmentally acceptable. equipment design that uses fluids requires knowledge thermophysical properties. If one or fluid properties are...
Densities and ultrasound speeds were determined in aqueous binary mixtures of 2-diethylaminoethanol over the whole composition range at intervals 5 K temperature between 283 303 K. Thermal expansibility effects on this amphiphile/water mixture are analysed terms excess molar isobaric expansions EEP,m for apparent EEP,ϕ,i both chemical substances mixture. Different strategies used discussed obtaining limiting (infinite dilution) partial expansions. Compressibility described isentropic...