Eur. Phys. J. E 5, 329-336

Hydrodynamic interactions in the structural fluctuation of a ternary amphiphilic system C₁₂E₅/water/n-octane

Shigehiro Komura¹, T. Takeda², Y. Kawabata², S.K. Ghosh², H. Seto² and M. Nagao<sup>3

1</sup>  Department of Physics, Ochanomizu University, 2-1-1 Ohtsuka, Bunkyo, Tokyo 112-8610, Japan
²  Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan
³  Institute for Solid State Physics, The University of Tokyo, 106-1 Shirakata, Tokai 319-1106, Japan

komura@amy.hi-ho.ne.jp

(Received 1 December 1999 and Received in final form 12 March 2001)

Abstract
Dynamical fluctuations of microemulsion and lamellar structures in a ternary amphiphilic system C₁₂E ₅/water/n-octane are studied by means of neutron spin echo spectrometry. The decay rate of the time correlation of the concentration was analyzed in terms of a theory (M. Nonomura, T. Ohta, J. Chem. Phys. 110, 7516 (1999)), in which both van Hove and hydrodynamic interactions are considered. The result shows that the time correlation function is expressed mostly by a single exponential determined exclusively by hydrodynamic interactions.

PACS
68.10.-m - Fluid surfaces and fluid-fluid interfaces.
68.35.Ja - Surface and interfaces dynamics vibrations.
82.70.Kj - Emulsions and suspensions.


© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2001