Rheologica Acta

, Volume 52, Issue 1, pp 49–57 | Cite as

Using the anisotropy of magnetic susceptibility to infer flow-induced orientation of anisotropic particles: feasibility and sensitivity

  • Meral Akkoyun
  • Jean-Charles Majesté
  • Jérome Bascou
Original Contribution

Abstract

In this paper, the use of anisotropy of magnetic susceptibility (AMS) measurements has been investigated in order to check the sensitivity of this technique versus the flow conditions. The orientation of anisotropic magnetic particles during the flow of a polystyrene\(/\)magnetite blend through a capillary rheometer has been studied. Thanks to the magnetic properties of the magnetite, AMS measurements are possible. Different values of the filler concentration, viscosity, and shear rate were used. It is shown that the AMS technique is able to detect accurately particle orientation and that sensitivity decreases when increasing the concentration of magnetite grains. In addition, the rectangular-shaped sample imposed by the rheological device does not affect measures of AMS significantly. The results give reasons to consider that the measure of AMS is an accurate and sensitive method to access the mean local rheological behavior in filled or non-filled systems containing anisotropic tracers.

Keywords

Filled polymer Flow induced orientation Shear flow 

Notes

Acknowledgments

Bernard Henry is thanked for assistance in the AMS measurements and Yannick Branquet for providing the first samples of magnetite grains used in our experiments. Authors would like to thank two anonymous reviewers for their constructive comments.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Meral Akkoyun
    • 1
    • 2
    • 3
  • Jean-Charles Majesté
    • 1
    • 2
    • 3
  • Jérome Bascou
    • 1
    • 3
    • 4
  1. 1.Université de LyonSaint-EtienneFrance
  2. 2.CNRS, UMR 5223, Ingénierie des Matériaux PolymèresSaint-EtienneFrance
  3. 3.Université de Saint-Etienne, Jean MonnetSaint-EtienneFrance
  4. 4.CNRS, UMR 652, Magmas et VolcansSaint-EtienneFrance

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