Calorimetric investigation of the formation of aqueous two-phase systems in ternary mixtures of water, poly (ethylene oxide) and electrolytes (Or Dextran).

Article Abstract:

The evolution of ternary mixtures containing water, poly (ethylene oxide) (PEO) and dextran or electrolytes (NaCL, Na2SO4 or Li2SO4), towards the formation of aqueous two-phase systems is studied by calorimetry measuring enthalpies of solution for one of the components in water and in an aqueous solution of the other component. A model is proposed to account for the processes leading to phase separation in terms of electrolyte and polymer interaction.

Ethylene Oxide, Electrolytes

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Identification of 1,3-dialkylimidazolium salt supramolecular aggregates in solution

Article Abstract:

The nature of the interactions between 1,3-dialkylimidazolium cations and noncoordinating anions such as tetrafluroborate, hexafluorophosphate, and tetraphenylborate is studied in the solid state by X-ray diffraction analysis and in solution by 1H NMR spectroscopy, conductivity, and microcalorimetry. The model is very useful for the rationalization of the majority of the unusual behavior of the ionic liquids.

Chemistry, Physical and theoretical, Physical chemistry, Chemical reactions, Azo compounds, Chemical properties

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Solvent modulated polymorphism of sodium stearate crystals studied by X-ray diffraction, solid-state NMR, and Cryo-SEM

Article Abstract:

Ternary crystalline dispersions of 10 wt % sodium stearate (NaSt) in mixtures of water and propylene glycol (PG) are investigated. Two lamellar crystalline structures, alpha-Nast and beta-NaSt, are determined.

Propylene Glycol, Usage, Observations, Water, X-ray diffraction, Nuclear magnetic resonance

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