TY - JOUR
T1 - Anomalous hydrodynamic behavior of lyotropic smectic phases of hydrated phospholipid at low frequencies
AU - Yamamoto, Jun
AU - Tabe, Yuka
AU - Okano, Koji
PY - 1992/11
Y1 - 1992/11
N2 - 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).
AB - 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).
KW - 1 /co-type viscosity divergence
KW - Fluctuating hydrodynamics
KW - L-L phase transition
KW - Layer compression modulus
KW - Longitudinal viscosity
KW - Lyotropic smectic
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U2 - 10.1143/JJAP.31.L1560
DO - 10.1143/JJAP.31.L1560
M3 - Article
AN - SCOPUS:0026943361
SN - 0021-4922
VL - 31
SP - L1560-L1562
JO - Japanese journal of applied physics
JF - Japanese journal of applied physics
IS - 11
ER -