In situ shear investigation of the Synperonic A7-water system by small-angle X-ray scattering and freeze fracture.
A shear cell was constructed in two variants for simultaneous small-angle X-ray scattering and freeze fracture. Using this cell, the changes in the layer structure and the domain formation of the Synperonic A7-water system were investigated under shear. The reconstructions of both the layer and domain structures were not observed in the steady state after 1 h (following a 2 h long shear period). Destruction of the lamellar arrangement and formation of aggregates occurred during the stress. It was concluded that the tixotropic behavior originates rather from the change of the domain structure with a typical size range of microm than from the changes of the inner structure of domains with lamellar arrangement.
Bóta
Attila
A
Department of Physical Chemistry, Budapest University of Technology and Economics, 1521-Budapest, Hungary. abota@mail.bme.hu
Fetter
György
G