Thermodynamic non-ideality and disorder heterogeneity in actinide silicate solid solutions

Analysis of thermodynamic non-ideality in terms of protein solvation.

The effects of thermodynamic non-ideality on the forms of sedimentation equilibrium distributions for several isoelectric proteins have been analysed on the statistical-mechanical basis of excluded volume to obtain an estimate of the extent of protein solvation. Values of the effective solvation parameter delta are reported for ellipsoidal as well as spherical models of the proteins, taken to b...

COVOL: an answer to your thermodynamic non-ideality problems?

Introduction Thermodynamic non-ideality can lead to serious problems in terms of the analysis of macromolecular behaviour in solution, particularly in molar mass and mass action measurements based on the principles of thermodynamic equilibrium. The term ‘molar mass’ (in g/mol) favoured by the physical chemist is of course equivalent to the molecular mass in daltons, and by ‘mass action’ we mean...

Non-ideality in multicomponent diffusion of polyelectrolyte solutions

Fluoride-conversion synthesis of homogeneous actinide oxide solid solutions.

The synthesis of (U,Th)O(2) solid solutions at a relatively low temperature of 1100 °C using a new technique is described. First, separate actinide oxides were reacted with ammonium hydrogen fluoride to form ammonium actinide fluorides at room temperature. Subsequently, this fluoride was converted to an actinide oxide solid solution using a two-phase reaction process, which involved heating of ...

Cation distributions and thermodynamic properties of binary spinel solid solutions

A general model is presented to enable the calculation of the cation distribution and thermodynamic properties of any binary solid solution between oxide spinels containing 2*, 3* and 4* cations. The model includes the effect ofdisordering enthalpy which depends linearly on the degree of disorder. In addition there are important contributions to the thermodynamic properties from the size mismat...