Abstract
We studied the influence of shear on a lyotropic lamellar phase using the ILL Couette type shear cell on the SANS spectrometer D11 at the ILL, Grenoble. Because of the broad range of momentum transfers available on this instrument a characteristic butterfly pattern with a scattering peak along the neutral direction revealing both the structure and the supramolecular structure of the system could be detected at very high shear rates and very low Q. After cessation of flow the butterfly pattern disappeared immediately and the diffraction pattern showed a ring with an intensity maximum still perpendicular to the direction of flow. We present a model in real space describing this new structure of a lamellar phase at high shear rates.
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