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.

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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.

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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.

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