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 ̇ γτdis1, where τdis 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 η follows a simple η~e^-aS behavior as a function of the orientational order parameter S with the same prefactor a.
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Förster et al. (2005) studied this question.
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