Diffusion coefficients of water and cyclohexane in porous sol-gel glass of
average pore diameter 2.9 nm were obtained using a radioactive tracer
technique. This information was applied to calibrate the membrane in the
diaphragm cell which was subsequently used to measure the diffusion
coefficients for cyclohexane, acetone, toluene, acetonitrile, and
chloroform. Results for cyclohexane were compared with computer simulation
of molecular motion of cyclohexane in a model cylindrical pore of diameter
2.9 nm. Translational motion of polar liquids inside the pores was found to
be faster than that of neutral, not wetting solvents.