Diffusion of Buckminsterfullerene in n-Alkanes

The translational diffusion constant, D, of C 60 has been determined in the even n -alkanes n -C 6 H 14 to n -C 16 H 34 using microcapillary techniques and Taylor-Aris dispersion theory. Experiments were conducted over extended periods of time to ensure that the solute was not associated with itself or with solvent. The D values show deviations from the Stokes−Einstein (SE) relation ( D = kT /6πη r ); the values of the solute's hydrodynamic radius r decrease as the solvent viscosity η increases. The data can be fitted to D / T = A SE /η p with p = 0.903 ± 0.006 ( p = 1 for the SE relation).