Transition from fractional to classical Stokes-Einstein behaviour in simple fluids.

ABSTRACT: An optical technique for tracking single particles has been used to evaluate the particle diameter at which diffusion transitions from molecular behaviour described by the fractional Stokes-Einstein relationship to particle behaviour described by the classical Stokes-Einstein relationship. The results confirm a prior prediction from molecular dynamic simulations that there is a particle size at which transition occurs and show it is inversely dependent on concentration and viscosity but independent of particle density. For concentrations in the range 5 × 10^-3 to 5 × 10^-6 mg ml^-1 and viscosities from 0.8 to 150 mPa s, the transition was found to occur in the diameter range 150-300 nm.

SUBMITTER: Coglitore D 

PROVIDER: S-EPMC5749985 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature