Transient electric-birefringence (TEB) and smallangle neutron-scattering (SANS) studies have been carried out on w/o microemulsions stabilised by the nickel salt of di(ethyl)hexylsulphosucclnate Ni(AOT)2. The system fonns rods at low water contents, which convert to more spherical aggregates as the concentration of water is increased. TEB data have been obtained as a function of volume fraction and water content, both below and above the entanglement regime. The asymptotic decay of birefringence is well described by a stretched-exponential function . The dynamic data have been analysed following consideration of the theory by Cates  assuming that the rods are rigid, polydlsperse and can undergo reversible scission. The static data have been interpreted developing a theoretical model to calculate the polarizabilities along and orthogonal to the symmetry axis of the rod . With the aid of this model, we can justify an apparent collective effect In the specific Kerr constant and compare the rod dimensions measured by SANS and by TEB. A reasonably good agreement is obtained.
|Publication status||Published - 14 Sep 1997|
|Event||11th Conference of the European Colloid and Interface Society - Congress Centre De Blije Werelt , Lunteren, Netherlands|
Duration: 14 Sep 1997 → 19 Sep 1997
|Conference||11th Conference of the European Colloid and Interface Society|
|Period||14/09/97 → 19/09/97|
- transient electric-birefringence
- small angle neutron scattering