Layer with reduced viscosity at water-oil interfaces probed by fluorescence correlation spectroscopy

Dapeng Wang, Leonid Pevzner, Chen Li, Kalina Peneva, Christopher Y. Li, Derek Y. C. Chan, Klaus Müllen, Markus Mezger, Kaloian Koynov, and Hans-Jürgen Butt
Phys. Rev. E 87, 012403 – Published 3 January 2013


The two-dimensional diffusion of isolated molecular tracers at the water–n-alkane interface was studied with fluorescence correlation spectroscopy. The interfacial diffusion coefficients of larger tracers with a hydrodynamic radius of 4.0 nm agreed well with the values calculated from the macroscopic viscosities of the two bulk phases. However, for small molecule tracers with hydrodynamic radii of only 1.0 and 0.6 nm, notable deviations were observed, indicating the existence of an interfacial region with reduced effective viscosity and increased mobility.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 24 February 2012


©2013 American Physical Society

Authors & Affiliations

Dapeng Wang1, Leonid Pevzner1, Chen Li1, Kalina Peneva1, Christopher Y. Li2, Derek Y. C. Chan3,4, Klaus Müllen1, Markus Mezger1, Kaloian Koynov1,*, and Hans-Jürgen Butt1

  • 1Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
  • 2Department of Materials Science and Engineering, Drexel University, Philadelphia 19104, USA
  • 3Department of Mathematics and Statistics and Particulate Fluids Processing Centre, University of Melbourne, Parkville, 3010, Australia
  • 4Faculty of Life and Social Sciences, Swinburne University of Technology, Hawthorn 3122, Australia

  • *Corresponding author:

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Vol. 87, Iss. 1 — January 2013

Reuse & Permissions
Access Options
Physical Review E Scope Description to Include Biological Physics
January 14, 2016

The editors of Physical Review E are pleased to announce that the journal’s stated scope has been expanded to explicitly include the term “Biological Physics.”

Authorization Required




Sign up to receive regular email alerts from Physical Review E

Log In



Article Lookup

Paste a citation or DOI

Enter a citation