Abstract
The binary liquid system acetonitrile + cyclohexane has closely matched densities, equal to within 0.2% at 20 °C, a density inversion in the system at ; $\simeq\hspace{2mm} 32^oC$ and a critical solution temperature off $\simeq\hspace{2mm}76^oC$. It is thus an excellent system for simulating buoyancy corrected microgravity in the laboratory. The changes of the density inversion temperature ti caused by doping with water soluble in acetonitrile only and acetic anhydride soluble in both liquids has been studied experimentally $dt_i/dX$ is equal to $1.7\hspace{2mm}\pm\hspace{2mm}0.1$ mK/ppm weight fraction of water with respect to acetonitrile and is $1.0\hspace{2mm}\pm\hspace{2mm}0.1$ mK/ppm weight fraction of acetic anhydride with respect to acetonitrile. Simplified models of the phenomena are presented for each case of doping.
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