Shear thinning and orientational ordering of wormlike micelles -: art. no. 017803

被引：97

作者：

Förster, S ^{[1
]}

Konrad, M

Lindner, P

机构：

[1] Univ Hamburg, Inst Phys Chem, D-20146 Hamburg, Germany

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.94.017803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Shear thinning and orientation of cylindrical surfactant and block copolymer micelles was investigated by rheo-SANS (small-angle neutron scattering) experiments. Shear thinning and orientation occur for shear rates (gamma) ocer dot tau(dis)much greater than1, where tau(dis) is the disentanglement time of the micelles. Micelles align in the flow direction with an orientational distribution that can be well described by an Onsager-type distribution function. Over nearly the whole range of concentrations and for all cylindrical micelles investigated, the shear viscosity eta follows a simple etasimilar toe(-aS) behavior as a function of the orientational order parameter S with the same prefactor a.

引用

页数：4

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