| Autor: |
Giraudet, C., Marlin, L., Bégué, D., Croccolo, F., Bataller, H. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 2016, Vol. 144 Issue 13, p134304-1-134304-10, 10p, 1 Diagram, 3 Charts, 9 Graphs |
| Abstrakt: |
Carbon dioxide (CO2)/methane (CH4) binary mixtures are investigated at pressure values up to 20 MPa at 303 K in order to investigate the pressure dependence of the optical concentration contrast factor, (∂n/∂c) P,T, through gaseous and supercritical phase. Refractive index is measured by means of a Michelson interferometer. Refractivities of the mixtures are found in good agreement with Lorentz-Lorenz predictions after density calculations by means of the AGA8-DC92 equation of state. Experimental polarizabilities of pure fluids are compared to quantum calculations of monomers and dimers for each pressure; it results that the quantity of dimers is small in the investigated thermodynamic conditions. Finally, by extending our experimental database with numerical simulations, we evidence that (∂n/∂c) P,T presents a critical enhancement similar to heat capacity. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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