Self-Diffusion Coefficients of Some Hydrocarbons in Water: Measurements and Scaling Relations

We present values of the self-diffusion coefficients at 25 °C of four hydrocarbons ( n -pentane, n -hexane, cyclohexane, and o -xylene) at saturation concentrations in (heavy) water. To calculate the corresponding values for the series of n -alkanes, we suggest two alternative scaling relations for the dependence of the self-diffusion coefficients on the molecular weights of the n -alkanes. The scaling relations are “calibrated” using the value presented for n -pentane.