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- Title
Shear-induced structural transition in the lamellar phase of the C<sub>16</sub>E<sub>7</sub>/D<sub>2</sub>O system. Time evolution of small-angle neutron scattering at a constant shear rate.
- Authors
Miyazaki, Kyoko; Kosaka, Yuriko; Kawabata, Youhei; Komura, Shigeyuki; Kato, Tadashi
- Abstract
The time evolution of small-angle neutron scattering is measured for the lamellar phase of a nonionic surfactant C16H33(OC2H4)7OH (C16E7) in D2O at 48 wt% at 343 K under shear flow. At the shear rates of 0.3, 1 and 3 s−1, a new diffraction peak appears at higher q [where q = (4π/λ)sin θ, and λ and 2θ are the wavelength of the neutron beam and the scattering angle, respectively] about 1–2 h after applying shear flow and coexists with the initial diffraction peak. The coexistence of two peaks continues even after 5 h at 0.3 s−1 whereas at 1 and 3 s−1 the peak at lower q disappears after about 3 h. These results indicate that the repeat distance decreases discontinuously and so suggest some sort of transition. A plot of the repeat distance after 5 h versus shear rate shows a minimum at 1 s−1, which is in good agreement with our previous results obtained by increasing the shear rate stepwise.
- Subjects
PARTICLES (Nuclear physics); FLUID dynamics; OPTICAL diffraction; SURFACE active agents; NEUTRON beams; SCATTERING (Physics)
- Publication
Journal of Applied Crystallography, 2007, Vol 40, ps332
- ISSN
0021-8898
- Publication type
Article
- DOI
10.1107/S0021889807013568