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Colloid and Polymer Science

, Volume 274, Issue 12, pp 1183–1187 | Cite as

Surface viscoelasticity of phospholipid monolayers at the air/water interface

  • J. Krägel
  • J. B. Li
  • R. Miller
  • M. Bree
  • G. Kretzschmar
  • H. Möhwald
Short Communication

Abstract

The surface viscoelastic properties of monolayers of two phospholipids DPPC (L-α-dipalmitoylphosphatidylcholine) and DMPE (L-α-dimyristoylphosphatidyl-ethanolamin), at the air-water interface have been investigated. Two techniques were used for the investigation. One involved use of an interfacial shear rheometer (torsion pendulum apparatus ISR1), to provide measurements of the shear viscosity ηs as a function of surface pressure, and the second, a modified LB trough with an oscillating barrier to generate periodie dilation and compression so as to measure the dilational elastic modulusE as a function of surface area.

Results indicate a strong dependence of ηs andE upon monolayer phases. This suggests that the viscoelastic relaxation of monolayers can be understood as molecular rearrangements, domain exchange and molecular reorientations between different monolayer states.

Key words

Phospholipid Langmuir monolayers surface rheology surface dilational elasticity surface shear viscosity 

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Copyright information

© Steinkopff Verlag 1996

Authors and Affiliations

  • J. Krägel
    • 1
  • J. B. Li
    • 1
    • 3
  • R. Miller
    • 1
  • M. Bree
    • 1
  • G. Kretzschmar
    • 2
  • H. Möhwald
    • 2
  1. 1.Institut für FestkörperphysikUniversität PotsdamPotsdamFRG
  2. 2.MPI für Kolloid-und GrenzflächenforschungBerlinFRG
  3. 3.Institute of Photographic ChemistryChinese Academy of SciencesBeijingChina

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