- Conference date: 3-8 November 2003
- Location: Sendai (Japan)
Small‐angle neutron scattering (SANS) is measured on a lamellar phase in C16E7 (hepta(oxyethylene glycol)‐n‐hexadecylether) /water system (40 – 55 wt% of C16E7) at 70 °C under shear flow. As the shear rate increases from 0.3 to 1 s−1, the repeat distance (d) is reduced suddenly and discontinuously. With the further increase in the shear rate, d increases slightly after taking a minimum (d *). These results are obtained for all the principal orientations of lamellae. While d at rest increases from 6.5 nm to 8.5 nm with decreasing concentration from 55 to 40 wt%, d * is almost independent of concentration and nearly equal to the thickness of bilayers (∼ 5 nm) obtained from the line shape analysis of small angle X‐ray scattering at rest. These results suggest segregation into surfactant‐rich and water‐rich regions.
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