Breakdown of the Continuum Stokes−Einstein Relation for Nanoparticle Diffusion

Anish Tuteja and Michael E. Mackay*
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824
Suresh Narayanan
Advanced Photon Source, Argonne National Labs, Argonne, Illinois 60439
Subashini Asokan and Michael S. Wong
Department of Chemistry, Rice University, Houston, Texas 77251
Nano Lett., 2007, 7 (5), pp 1276–1281
DOI: 10.1021/nl070192x
Publication Date (Web): March 31, 2007
Copyright © 2007 American Chemical Society
*

 Corresponding author. E-mail:  mackay@msu.edu. Web page:  www.nanoeverything.com.

Abstract

Abstract Image

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.

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History

  • Published In Issue May 09, 2007
  • Received January 24, 2007
    Revised Manuscript Received March 9, 2007

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