Diffusion and structure in dilute aqueous alcohol solutions: evidence for the effects of large apolar solutes on water

Article Abstract:

Solutions with amphiphilic solutes having apolar or hydrophobic groups have been studied by measuring the dependence of molecular motion on pressure using diffusion measurements as a probe. Water-alcohol mixtures at mole fraction equal to 0.025 and at pressures up to 400 Mpa have been investigated. Results indicate that the intra-diffusion coefficient of water in a dilute solution of aqueous tert-butyl alcohol attains maximum values with increasing pressure at low temperatures. This means that water in these solutions is more structured than in pure water.

Alcohol, Ethanol, Solution (Chemistry), Solutions (Chemistry)

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Effect of shear on intramolecular and intermolecular association during cross-linking of hydroxyethylcellulose in dilute aqueous solutions

Article Abstract:

Intramolecular and intermolecular associations of dilute aqueous alkali solutions of hydroxyethylcellulose (HEC) in the presence of a chemical cross-linker agent are studied. The delicate interplay between intramolecular and intermolecular association effects is governed by factors such as the magnitude of the shear rate, polymer concentration, and cross-linker density.

Cellulose, Shear (Mechanics), Aqueous solution reactions, Chemical properties

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Conductivity measurements of dilute aqueous HCl solutions to high temperatures and pressures using a flow-through cell

Article Abstract:

The flow-through cell is designed to measure molar conductance of dilute aqueous electrolytes with a high degree of accuracy at high temperatures and low densities. Values of ionic and molar conductance and association constants of HCl solutions at temperatures of 100-410 0C and pressures up to 32 MPa have been calculated with the FHFP equation.

Chemistry, Analytic, Analytical chemistry, Hydrogen chloride, Thermal properties, Conductometric analysis

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