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Structure of a Lamellar Phase Formed by Non-ionic Surfactant and Water: Effects of shear flow

Authors:

Institution:

(1) Department of Chemistry, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan;(2) Department of Applied Chemistry, Tokyo Metropolitan University, 1-1 Minamiohsawa Hachioji, Tokyo 192-0397, Japan;(3) Department of Physics, Ochanomizu University, 2-1-1 Otsuka, bunkyo-ku, Tokyo 112-8610, Japan

Abstract:

We have investigated effects of shear flow on the structure of lamellar phase in hepta(oxyethylene glycol)—n—hexadecylether—water system using small-angle neutron scattering (SANS) under shear flow at the shear rates (

$\dot \gamma$

) from 10^–3 s^–1 to 50 s^–1. In the range

$\dot \gamma$

=10^–2 ~1 s^–1, significant changes have been observed in both intensity and position of the reflection peak. Small-angle X-ray scattering without shear has been also measured at various concentrations and temperatures. It has been suggested from these results that the shear flow causes contraction of lamellar domains and formation of a new domain composed of disrupted bilayers which grows rapidly with increasing shear rate and reconstructs original microstructures.This revised version was published online in November 2005 with corrections to the Cover Date.

Keywords:

bilayers lamellar phase SANS SAXS shear small-angle scattering surfactant

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