Self-diffusion in liquid acetonitrile under pressure
Abstract
Self-diffusion measurements are reported for acetonitrile in the temperature range 238–343 K at pressures up to 300 MPa. Lack of reliable high-pressure density data has restricted tests of theory to the temperature range 268–328 K. Over that range the results show a breakdown of rough hard-sphere theory which is attributed to the strongly dipolar nature of the acetonitrile molecule. A correlation approach based on Enskog smooth hard-sphere theory is found to be less sensitive to the dipole–dipole interactions.
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