Motion in large-viscosity simple solvents

This section examines motion (diffusion, conductance, electrophoretic mobility) of rigid probes through simple solvents and small-molecule solutions. Experiments test the validity of Stokes law / and the Stokes-Einstein form D T/rjR. 

Multiple reports exist of deviations from Stokes law behavior for small-viscosity fluids. 

Stokes and Stokes(4) measured A of small ions in sucrose solutions. From their paper, Arj increases by 20% as rj/rio increases nearly twofold. Specific ion effects were also in evidence, A at fixed sucrose concentration varying by 1-2% from ion to ion. On extending their measurements to 60% sucrose solutions, t] increased nearly 50-fold, Arj increased more than threefold, but Arj was very nearly independent of sucrose concentration. References to a 0.7 power dependence A may be traced back to Heber-Green(S), who reported that A depends very nearly on the 2/3 power of the solution fluidity (i.e., on Heber-Green reported that 

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