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

Jun Yamamoto, Yuka Tabe, Koji Okano

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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
Volume31
Issue number11 A
Publication statusPublished - 1992 Nov 1
Externally publishedYes

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Phospholipids
humidity
Atmospheric humidity
Hydrodynamics
hydrodynamics
low frequencies
Viscosity
viscosity
Phase boundaries
X ray scattering
Phase diagrams
Compaction
phase diagrams
scattering
x rays
Temperature
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Anomalous hydrodynamic behavior of lyotropic smectic phases of hydrated phospholipid at low frequencies. / Yamamoto, Jun; Tabe, Yuka; Okano, Koji.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 31, No. 11 A, 01.11.1992.

Research output: Contribution to journalArticle

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