Relaxation of shear-aligned wormlike micelles

被引:21
作者
Angelico, R
Olsson, U
Mortensen, K
Ambrosone, L
Palazzo, G
Ceglie, A
机构
[1] Lund Univ, Ctr Chem & Chem Engn, S-22100 Lund, Sweden
[2] Univ Molise, DISTAM, I-86100 Campobasso, Italy
[3] Riso Natl Lab, Condensed Matter Phys & Chem Dept, DK-4000 Roskilde, Denmark
[4] Univ Bari, Dipartimento Chim, I-70126 Bari, Italy
关键词
D O I
10.1021/jp013934y
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report on the first time-resolved small-angle neutron scattering (SANS) study of the structural relaxation from a shear-induced aligned state back to the isotropic state in a system of giant wormlike reverse micelles. The micelles are formed by lecithin and small amounts of water in cyclohexane. A liquid sample with the micellar volume fraction phi = 0.3 was exposed to a steady shear of (gamma) over dot = 10 s(-1) in a Couette shear cell. This was sufficient to transform the whole sample into an aligned state with the polymer-like micelles preferentially oriented parallel to the velocity direction. After cessation of shear, the sample relaxes back to the equilibrium liquid phase. By time-resolved SANS we could follow the relaxation process, which is characterized by a continuous decrease of the order parameter.
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页码:2426 / 2428
页数:3
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