By Sandra Lerouge, Jean-François Berret (auth.), Karel Dusek, Jean-François Joanny (eds.)
Table of Contents Shear-Induced Transitions and Instabilities in Surfactant Wormlike Micelles Sandra Lerouge and Jean-François Berret Laser-Interferometric Creep expense Spectroscopy of Polymers Vladimir A. Bershtein and Pavel N. Yakushev Polymer Nanocomposites for Electro-Optics: views on Processing applied sciences, fabric Characterization, and destiny program Katarzyna Matras-Postolek and Dariusz Bogdal
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Additional resources for Polymer Characterization: Rheology, Laser Interferometry, Electrooptics
5 cm in height (the total height of the inner cylinder is 4 cm) and centered at halfway of the cell. Reprinted from Lerouge et al.  amplitude (photo 12). Note that such different scattering properties in each band have also been reported in [153,157] using polarized SALS. The part of the stress dynamics corresponding to the appearance and the development of the interface instability is the small undershoot that precedes steady-state [195, 196]. A crucial point in this time sequence is that the small undershoot in the σ (t) curve appears as the mechanical signature of the interface instability.
1, the authors demonstrated that the position of the interface between bands strongly fluctuates as a function of time. The high shear rate band (light gray zone in Fig. 19) supports a roughly constant shear rate (γ˙ 70 s−1 ) and its width is strongly correlated to the degree of slip at the inner moving wall. The fluctuations are quasi-random or periodic, depending on sample preparation, and seem then to be driven by wall slip. A frequency analysis revealed that the correlation time ( 10 s) is of the same order of 36 S.
20 Map of the local shear rate γ˙(y,t) determined using USV, for a 20 wt. % C16 TAB/D2 O concentrated micellar system after start-up of flow at a fixed shear rate γ˙ = 50 s−1 in the banding regime. The extremum values of the gray scale are associated with γ˙ = 0 s−1 (black) and γ˙ > 120 s−1 (white). The positions y = 0 and y = 1 correspond, respectively, to the inner moving and outer fixed cylinders. The temperature is kept at 41◦ C. Reprinted with permission from Bécu et al.  magnitude as that observed in stress fluctuations.