Capillary electrophoresis of colloidal polyaniline particles

Polyaniline is an electrically conducting polymer which can be prepared in the form of a suspension of colloidal particles. In some cases, colloidal silica is added to the polymerization mixture to increase the stability of the resulting composite particle suspension but also to modify their electrophoretic mobility and other important parameters as well. The capillary electrophoresis method was developed to separate the silica-based composite from the polyaniline-based composite particles in order to have the possibility to apply this powerful separation technique for the determination of the uniformity or heterogeneity of more complex composite particles.