Solvent Polarities of Supercritical CO_2/Methanol Mixtures
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UV/VIS absorption spectroscopy was used to estimate the microscopic solvent polarities of supercritical carbon dioxide alone and its mixtures with methanol. It was found that the local composition of methanol in the cybotactic region of 4-nitroanisole was larger than the corresponding bulk concentration. With increasing pressure the methanol molecules were pressed out of the solvation shell of probe molecule by the carbon dioxide molecules. From the solubility measurements the solvation numbers of the carbon dioxide molecules around 4-nitroanisole were calculated as a function of fluid density.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 1423-1425, 1998
The Japan Society of High Pressure Science and Technology