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Bending modulus of lipid bilayers in a liquid-crystalline phase including an anomalous swelling regime estimated by neutron spin echo experiments

  • H. Seto
  • N. L. Yamada
  • M. Nagao
  • M. Hishida
  • T. Takeda
ISMC-2007

Abstract.

Membrane fluctuations of dipalmitoylphosphatidylcholine (DPPC) and dimyristoylphosphatidylcholine (DMPC) were investigated by neutron spin echo spectroscopy. The intermediate structure factor was analyzed in terms of the model proposed by Zilman and Granek (Phys. Rev. Lett. 77, 4788 (1996)), and the bending modulus of lipid bilayers was derived. The hardening of a lipid bilayer upon approaching the main transition point in the anomalous swelling regime was observed, which naturally connects the bending modulus in the gel phase below the main transition temperature.

PACS.

87.16.D- Membranes, bilayers, and vesicles 87.14.Cc Lipids 87.64.Bx Electron, neutron and X-ray diffraction and scattering 82.70.Uv Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems, (hydrophilic and hydrophobic interactions) 

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2008

Authors and Affiliations

  • H. Seto
    • 1
  • N. L. Yamada
    • 2
  • M. Nagao
    • 3
    • 4
  • M. Hishida
    • 1
  • T. Takeda
    • 5
  1. 1.Department of PhysicsKyoto UniversityKyotoJapan
  2. 2.Institute of Materials Structure ScienceHigh Energy Accelerator Research OrganizationTsukubaJapan
  3. 3.NIST Center for Neutron ResearchNational Institute of Standards and TechnologyGaithersburgUSA
  4. 4.Cyclotron FacilityIndiana UniversityBloomingtonUSA
  5. 5.Graduate School of Integrated Arts and SciencesHiroshima UniversityHigashihiroshimaJapan

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