Effect of Confinement on Membrane Undulation in a Swollen Lamellar Phase

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Norifumi L. Yamada¹^,⁴, Takayoshi Takeda², Katsuya Kato¹, Michihiro Nagao³, and Hideki Seto⁴

+ Affiliations

¹Graduate School of Bio-Sphere Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8521 ²Faculty of Integrated Arts and Sciences, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8521 ³Institute for Solid State Physics, The University of Tokyo, Shirakata, Tokai, Naka, Ibaraki 319-1106 ⁴Department of Physics, Kyoto University, Kitashirakawa, Sakyo, Kyoto 606-8502

Received October 13, 2004

We have investigated a static structure and membrane undulation in a swollen lamellar phase by small-angle neutron scattering and neutron spin echo (NSE). The effective viscosity, estimated by NSE data analysis using Zilman and Granek's theory [Phys. Rev. Lett. 77 (1996) 4788], was larger than the bare viscosity of the solvent, and increased with decreasing lamellar repeat distance. A theory given by Gov et al. [Phys. Rev. E 70 (2004) 011104] for hydrodynamics in confined fluid membranes could explain the tendency of NSE results. This indicates that the interference from neighbouring membranes neglected in Zilman and Granek's theory should be considered in analyzing the membrane dynamics in the swollen lamellar phase from the NSE data.

https://doi.org/10.1143/JPSJ.74.875

KEYWORDS: undulation, effective viscosity, membrane, lamellar phase, NSE

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Effect of Confinement on Membrane Undulation in a Swollen Lamellar Phase

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