Neutron Diffraction from Shear Ordered Colloidal Dispersions

Small-angle neutron scattering patterns from shear ordered colloidal dispersions are discussed in terms of the scattering power distribution $I(1)$ along Bragg rods of hexagonal layers. The orientation dependence of the neutron scattering pattern is directly related to $I(1)$. Its experimental determination provides information on the structure and on stacking faults in such systems. Experimental data of Laun et al. [J. Rheol. 36, 743 (1992)] are discussed, and it is found that the system considered is close to random close-packed hexagonal layers.