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Structure and orientation dynamics of sepiolite fibers–poly(ethylene oxide) aqueous suspensions under extensional and shear flow, probed by in situ SAXS

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Abstract

The structure and orientation dynamics of sepiolite clay fibers about 1,000 nm long and 10 nm thick, suspended in an aqueous poly(ehtylene oxide) matrix of 105 g/mol molecular mass, have been studied under control extensional and shear flow. A new extensional flow cell developed at the “Laboratoire de Rhéologie” and the combined rheology and small angle X-ray scattering (Rheo-SAXS) setup available at the European Synchrotron Radiation Facility have allowed access to in situ and time-resolved fiber orientations and structure properties in the volume of suspensions under flow. In the volume fractions and shear rate domains for which the suspensions exhibit shear-thinning properties, two regimes of orientation separated by a critical strain rate have been identified under extensional flow.

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Acknowledgements

The authors wish to express their deepest thanks to the European Synchrotron Radiation Facility for SC866 beam time allocation. We thank T. Narayanan for his great help during the SAXS experiments, J. Gorini for technical assistance, and I. Snigireva for the SEM images at the ESRF.

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Authors and Affiliations

  1. Laboratoire de Rhéologie, Institut National Polytechnique de Grenoble, Université Joseph Fourier-Grenoble I, CNRS UMR 5520, BP 53, 38041, Grenoble Cedex 9, France

    Frédéric Pignon, Albert Magnin, Jean-Michel Piau & Gàbor Belina

  2. European Synchrotron Radiation Facility, BP 220, 38043, Grenoble Cedex 9, France

    Gàbor Belina & Pierre Panine

Authors
  1. Frédéric Pignon
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  2. Albert Magnin
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  3. Jean-Michel Piau
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  4. Gàbor Belina
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  5. Pierre Panine
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Correspondence to Frédéric Pignon.

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Pignon, F., Magnin, A., Piau, JM. et al. Structure and orientation dynamics of sepiolite fibers–poly(ethylene oxide) aqueous suspensions under extensional and shear flow, probed by in situ SAXS. Rheol Acta 48, 563–578 (2009). https://doi.org/10.1007/s00397-009-0355-y

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  • DOI: https://doi.org/10.1007/s00397-009-0355-y

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