Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 4, Issue 12, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.170507
Keywords
diffusion; Stokes-Einstein diffusion; fractional Stokes-Einstein equation; single nanoparticle tracking; nanoparticles
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Funding
- Engineering and Physical Sciences Research Council studentship at the University of Liverpool
- Royal Society
- Engineering and Physical Sciences Research Council [1335312] Funding Source: researchfish
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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 5x10(-3) to 5x10(-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.
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