Abstract
) of sizes between the tracer and solventmolecules are higher than 5 approximately, the behavior ofthe friction and diffusion coefficients is well described bythe Einstein relation, D = kT/ζ (1)from which the tracer is considered as a Brownian particle,where k is the Boltzmann constant and T the absolutetemperature.When the tracers have a quasi-macroscopic size, theStokes law can be derived from hydrodynamic arguments. Itgives an expression of the friction coefficientζ =CπηR
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