Regular solution modelling phase diagrams

Figure 3 Calculated results of the phase diagrams with systematic change ofW) and on the basis of the regular solution model...

MAG Maghsoud, Z., Famili, M.H.M., and Madaeni, S.S., Phase diagram calculations of water/tetrahydrofuran ly(viityl chloride) ternary system based on a compressible regular solution model, Iran. Polym. J., 19, 581,2010. 

Because the simulation of the cy -curves indicated a non-symmetric, non-ideal mixing behavior, we recalculated the phase diagram using a regular solution model which accounts for this non-symmetric mixing behavior in both phases, yielding four non-ideality parameters ... 

Phase diagrams are calculated from these data using regular solution or other appropriate solution models. Some of the great strengths of the CALPHAD approach are that it provides immediate, approximate diagrams for new systems of interest and that it can be readily extended to ternary and higher order systems that would be prohibitively complex and expensive to study experimentally. A comparison of the... 

Strontium- and barium-containing systems do not deviate much from regular solution behavior. The relatively simple nature of these melts therefore indicates that the variation in the enthalpy of mixing with the common anion must be explainable by a model taking into account coulombic and polarization interactions between ions in a fairly simple manner. This behavior is also evidenced by the phase diagrams of the binary systems... 

In the present section, we introduce a thermodynamic model of phase separation in a nanoparticle and analyze how the depletion effects can be taken into account The last part is devoted to the analysis of the influence of size and depletion on phase diagrams of regular solutions. In the Appendix, we present the rule of parallel tangents construction (not to confuse with common tangent rule) for the extreme points of the phase transition. In the following, the starting single phase is called old or parent phase and the newly formed phase is called new one. 

Daoudi et al. [83] applied the thermodynamic approach equal Gibbs energy analysis to the pressure-composition phase diagrams of binary mixtures exhibiting reentrant phase behavior. Three different solution models are tested. The experimental data for the 4-n-hexyloxy- and 4-n-octyl-oxy-4 -cyanobiphenyl system are successfully described by the regular solution hypothesis. 

The anionic fluorinated surfactant (SPFO) forms with the nonionic or the amphoteric hydrocarbon surfactant mixed micelles containing both types of surfactants. Both systems exhibit a negative deviation from ideality. Changes of the F and H chemical shifts of the two surfactants upon mixing are consistent with pseudophase diagrams, calculated from the cmc dependence on the fluorinated surfactant mole fraction. The interpretation of data was based a modified regular solution theory and the phase-separation model. 

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