Patterns Of Molecular Aggregation Research Articles

Volumetric Study of (3-Ethoxypropan-1-amine + Water) Mixtures between (283.15 and 303.15) K

Experimental densities were obtained in the binary mixtures water + 3-ethoxypropan-1-amine, for the whole composition range and at temperatures between (283.15 and 303.15) K. Derived thermodynamic properties such as apparent molar, excess molar, and excess partial molar volumes have been calculated. Limiting partial molar volumes and isobaric expansions were obtained for the two components. Different patterns of molecular aggregation and hydration schemes were detected.

Patterns of molecular aggregation in aqueous mixtures of species of the type C mE 2 m+1 · (OC 2H 4) n · OH : Part 1. Applications of an empirical model to some C mE 0 plus water systems

A rationale is given for the four-segment composition approach to the analysis and interpretation of the thermodynamic properties of binary amphiphile plus water systems. The hypothesis is introduced that there exist, within isotropic binary water plus amphiphile mixtures, labile patterns of molecular aggregation which resemble the more stable schemes that are observed in water plus non-ionic detergent systems. The nature of such patterns of molecular aggregation varies from one composition range to another in a manner which is reflected by changes in the composition dependence of the macroscopic properties. A new version of the four-segment model equations was devised to explore, in more detail, the nature of the composition dependence of thermodynamic properties in that composition segment which corresponds to a range of varying micellar geometries.

A four segment composition model for non-electrolyte aqueous mixtures

A model for analysing excess properties of mixtures of water and polar organic liquids, which embodies the assumption that the total composition ranges of such mixtures possess four distinct segments, is described and the results given for analyses of various properties of the ACN—water and THF—water systems. Some tentative conclusions are drawn from the results about patterns of molecular aggregation within these mixtures.

Analyses of excess molar volumes of the acetonitrile-water system using segmented composition models

A segmented composition model has been used to analyse a number of sets of values of the excess molar volumes of the acetonitrile-water system, covering fairly wide ranges of temperature and pressure. The assumption of the existence of reasonably discrete composition segments for a binary mixture introduces hypothetical standard states of its components. The properties of those hypothetical states have been explored and some conclusions made about the possible patterns of molecular aggregation.