Anomalous hydrodynamic behavior of lyotropic smectic phases of hydrated phospholipid at low frequencies

Jun Yamamoto, Yuka Tabe, Koji Okano

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We measured the frequency dependence of the longitudinal viscosity and the layer compression modulus of homeotropically aligned multilamellar film of hydrated dimyristoyl phosphatidylcholine (DMPC) at low frequencies from 10 Hz to 1 kHz, varying temperature (T) and relative humidity (RH) systematically. We have, for the first time, demonstrated unambiguously that in the Lα phase (the lyotropic smectic-A phase) the longitudinal viscosity diverges as 1/ω when the circular frequency goes to zero. In addition, we were able to construct the T-RH phase diagram of the Lα-Lβ′ transition of hydrated DMPC, based upon the T and RH dependences of the layer compression modulus. The phase boundary thus determined agreed well with that obtained by X-ray scattering by Smith et al. (J. Chem. Phys. 92 (1990) 4519).

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number11 A
Publication statusPublished - 1992 Nov 1
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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