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Falling ball viscosimetry of giant vesicle membranes: Finite-size effects

  • R. Dimova
  • C. Dietrich
  • A. Hadjiisky
  • K. Danov
  • B. Pouligny

Abstract:

We study the general problem of the friction felt by a spherical solid particle which moves parallel to the membrane of a spherical vesicle. Experiments are carried out with SOPC vesicles at room temperature, with different particle and vesicle sizes. Experimental data show considerable finite-size effects whenever the particle is not very small compared to the vesicle. These effects are found consistent with the hydrodynamical theory of the vesicle-particle problem. This agreement allows for a “robust” determination of membrane viscosity, independently of particle and vesicle sizes.

PACS. 68.10.Et Interface elasticity, viscosity, and viscoelasticity – 83.85.Pt Flow computation (e.g. finite element) 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 1999

Authors and Affiliations

  • R. Dimova
    • 1
  • C. Dietrich
    • 1
  • A. Hadjiisky
    • 1
  • K. Danov
    • 2
  • B. Pouligny
    • 1
  1. 1.Centre de recherche Paul-Pascal, CNRS, avenue A. Schweitzer, 33600 Pessac, FranceFR
  2. 2.Laboratory of Thermodynamics and Physico-Chemical Hydrodynamics, Faculty of Chemistry, University of Sofia, 1164 Sofia, BulgariaBG

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