Non-equilibrium concentration fluctuations in superparamagnetic nanocolloids

  • Ana Oprisan
  • Ashley Rice
  • Sorinel A. Oprisan
  • Cédric Giraudet
  • Fabrizio Croccolo
Regular Article

DOI: 10.1140/epje/i2017-11503-y

Cite this article as:
Oprisan, A., Rice, A., Oprisan, S.A. et al. Eur. Phys. J. E (2017) 40: 14. doi:10.1140/epje/i2017-11503-y
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Part of the following topical collections:
  1. Non-isothermal transport in complex fluids

Abstract.

We investigate non-equilibrium concentration fluctuations during the free diffusion of a colloidal suspension against pure water. We investigate Fe2O3 superparamagnetic nanocolloids with sizes between 1 and 10 nm by means of a shadowgraph apparatus to determine the mixture mass diffusion coefficient and kinematic viscosity. The experiments were performed in three distinct conditions: Experiment 1 is without any magnetic field; Experiment 2 with a vertical magnetic field; Experiment 3 after turning off the magnetic field. We found no correlation between the kinematic viscosity coefficient and the external magnetic field. Conversely, we found that the mass diffusion coefficient decreases in the presence of the external magnetic field and slowly rebounds after the magnetic field was turned off.

Graphical abstract

Keywords

Topical Issue: Non-isothermal transport in complex fluids

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Ana Oprisan
    • 1
  • Ashley Rice
    • 1
  • Sorinel A. Oprisan
    • 1
  • Cédric Giraudet
    • 2
  • Fabrizio Croccolo
    • 3
    • 4
  1. 1.College of CharlestonDepartment of Physics and AstronomyCharlestonUSA
  2. 2.Erlangen Graduate School in Advanced Optical Technologies (SAOT)University of Erlangen-NurembergErlangenGermany
  3. 3.Laboratoire des Fluides Complexes et leurs Réservoirs - UMR5150Université de Pau et des Pays de l’AdourAngletFrance
  4. 4.Centre Nationale d’Etudes Spatiales (CNES)ParisFrance