title: Breakdown of the continuum stokes-einstein relation for nanoparticle diffusion.
abstract: Cadmium selenide nanoparticles are found to diffuse approximately 200 times faster in a polymeric liquid than predicted by the Stokes-Einstein relation. This remarkable behavior is hypothesized to be due to the nanoparticles being smaller than the entanglement mesh to create a frictional drag that does not follow continuum expectations, in line with a theoretical calculation presented before. This is one of the first demonstrations of X-ray photo correlation spectroscopy applied to polymeric liquids, which we use to explain the simultaneous 60% viscosity reduction of the mixture through a proposed constraint release mechanism.
authors.affiliation: Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: Anish
authors.initials: A
authors.lastname: Tuteja
authors.forename: Michael E
authors.initials: ME
authors.lastname: Mackay
authors.forename: Suresh
authors.initials: S
authors.lastname: Narayanan
authors.forename: Subashini
authors.initials: S
authors.lastname: Asokan
authors.forename: Michael S
authors.initials: MS
authors.lastname: Wong