The dispersion and stability of nanofluids obtained by dispersing Al2O3 nanoparticles (obtained from different sources) in water have been analyzed. The differences arising from different dispersion techniques, the resulting particle size distribution, and time stability among the different samples are evaluated. Then the volumetric behavior up to high pressures (25 MPa) and atmospheric pressure viscosity were experimentally determined. It has been found that the influence of particle size in density is subtle but not negligible, but the differences in viscosity are very large and must be taken into account for any practical application. These viscosity differences can be rationalized by considering a theory describing the aggregation state of the nanofluid.

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Several, widely used, group contribution models have been used to predict solid-liquid equilibria for n-alco-hol+n-alkane binary mixtures. They are: modified W A C [l], DISQUAC [2, 31, Nitta-Chao [4] and the Hole Model (HM) (51. Also a recently reported group contribution model (AssODis) including association [6]has been taken into account. The results have been compared with experimental data &r:

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