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The structure of colloidal suspensions under shear flow: Light scattering experiments

  • C. Mathis
  • G. Bossis
  • J. F. Brasy
Colloids
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 76)

Abstract

The structure of a colloidal suspension under shear flow is investigated by light diffusion. The suspension, made of latex spheres (2a=750 Å) dispersed in a water and glycerol mixture, is in a liquid like state. We record the structure factor S(k) in the plane of shear for Peclet numbers (Pe=ya 2/D) lower than 10−1. The structure factor presents an asymetrical deformation when increasing the shear rate: we observe both angular and amplitude shifts of the maximum of S(k); moreover, it depends on the side (compression side or dilatation side of S(k). These results are compared with a linear approximation and numerical results. This comparison shows that the relevant parameter is Pe*=Pe.r*, where r* is an effective radius derived from the interparticle potential.

Key words

Colloidal suspension shear flow structure light scattering interacting particles 

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References

  1. 1.
    Ackerson BJ, Clark NA (1983) Physica 118A:221Google Scholar
  2. 2.
    Bossis G, Brady JF, Mathis C (1988) Colloid Interface Sci, to be publishedGoogle Scholar
  3. 3.
    De Rooy N, De Bruyn PL, Overbeek JT (1980) Colloid Interface Sci 75-2:542Google Scholar
  4. 4.
    Grüner F, Lehmann WP (1982) J Phys A, Math Nucl Gen 15:2847CrossRefGoogle Scholar
  5. 5.
    Härtl W, Versmold H (1984) Z Phys Chem 139:247Google Scholar
  6. 6.
    Mathis C, Bossis G, Brady JF (1988) Colloid Interface Sci, to be publishedGoogle Scholar
  7. 7.
    Pieranski P (1983) Contemp Phys 24:25CrossRefGoogle Scholar
  8. 8.
    Pusey PN, Van Megen W (1986) In: Safran SA (ed) Proceeding Symposium on Complex and Supermolecular Fluids. Wiley Interscience, New YorkGoogle Scholar
  9. 9.
    Schaefer DW (1977) J Chem Phys 66-9:3980CrossRefGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1988

Authors and Affiliations

  • C. Mathis
    • 1
  • G. Bossis
    • 1
  • J. F. Brasy
    • 2
  1. 1.Laboratoire de Physique de la Matière CondenséeUniversité de NiceNice CedexFrance
  2. 2.Department of Chemical EngineeringCalifornia Institute of TechnologyPasadenaU.S.A.

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