https://doi.org/10.1140/epje/i2007-10315-0
ISMC-2007
Bending modulus of lipid bilayers in a liquid-crystalline phase including an anomalous swelling regime estimated by neutron spin echo experiments
1
Department of Physics, Kyoto University, 606-8502, Kyoto, Japan
2
Institute of Materials Structure Science, High Energy Accelerator Research Organization, 305-0801, Tsukuba, Japan
3
NIST Center for Neutron Research, National Institute of Standards and Technology, 20899-6102, Gaithersburg, MD, USA
4
Cyclotron Facility, Indiana University, 47408-1398, Bloomington, IN, USA
5
Graduate School of Integrated Arts and Sciences, Hiroshima University, 739-8521, Higashihiroshima, Japan
* e-mail: hideki.seto@kek.jp
Received:
1
November
2007
Accepted:
17
March
2008
Published online:
30
April
2008
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) –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2008