High performance liquid chromatography (HPLC) is often the method of choice for the separation of nonvolatile solutes. LC commonly exhibits longer analysis times, larger pressure drops and lower efRciency than either supercritical Suid chromatography (SFC) or gas chromatography (GC). The greater viscosities and lower diffusivities of liquids compared to those of supercritical Suids or gases are...

A method of nonaqueous capillary electrophoresis based on ionic liquids was developed with a high electric field (800 V/cm). The ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate was used as modifier to improve the separation efficiency; trishydroxymethylaminomethane and sodium cholate were used as background electrolytes in methanol and acetonitrile. The ionic liquids used in this pap...

The vapor-liquid equilibria of 20 substances, most of them widely used as organic solvents, were obtained by means of a Gibbs ensemble Monte Carlo method. All these substances can be represented by linear or angular models with only two bonds. The intermolecular interaction was described by a Kihara potential and, where appropriate, an additional multipolar potential using meaningful microscopi...

84 per cent albite and we know enough of relations in our general system (Fig. 1) to be able to say that the conditions are similar in mixtures with an excess of silica (simplified fayalite-rhyolites) and also in those with a deficiency of silica (simplified fayalite-phonolites). While we have made only a first step in the investigation of these extreme liquids it is plain from the results of t...

The velocity field of a binary mixture of incompressible miscible liquids is non-solenoidal when the densities of the two liquids are different. If the mixture density is linear in the volume fraction, as in the case of simple (ideal) mixtures or very nearly for glycerin and water, then the velocity can be decomposed into a solenoidal and an expansion part. In the context of this theory, we der...

bifunctional acidic ionic liquids, having both h-imidazolium and -so3h groups as cation moieties (h-bfails) and cf3so3- as anion, were synthesized in high yields. these h-bfails showed significant hydrophilic properties, lower acidity and higher thermal stability relative to common ionic liquids, due to their unique structures. the (propyl or butyl-3-sulfonic) imidazolium trifluoromethane sulfo...

This work presents the physicochemical characterization of two ionic liquids (ILs) with small phosphonium cations, triethylpenthylphosphonium bis(trifluoromethanesulfonyl)imide ([P2225][Tf2N]) and (2-methoxyethyl)trimethylphosphonium bis(trifluoromethanesulfonyl)imide ([P222(201)][Tf2N]), and their mixtures with Li(+). Properties such as the electrochemical window, density, viscosity and ionic ...