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 La phase (the lyotropic smectic-A phase) the longitudinal viscosity diverges as 1 /co when the circular frequency goes to zero. In addition, we were able to construct the T-RH phase diagram of the La- Lp. 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
Pages (from-to)L1560-L1562
JournalJapanese journal of applied physics
Volume31
Issue number11
DOIs
Publication statusPublished - 1992 Nov

Keywords

  • 1 /co-type viscosity divergence
  • Fluctuating hydrodynamics
  • L-L phase transition
  • Layer compression modulus
  • Longitudinal viscosity
  • Lyotropic smectic

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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