Electrokinetic behavior in synthatic process of composite particles

Electrokinetic behavior in synthetic process of composite particles have been analysed under the different combination systems. Firstly, the heterocoagulation process of amphoteric polymer latices on spherical silica was investigated as a function of zeta-potential of component particles, particle size ratio and of electrolyte in the medium. On the basis of these data, subsequent experiments to prepare composite particles with multilayers comprised of usual anionic latices, ultrafine magnetic particles and polystyrene layers have been carried out, especially from the electrokinetic aspects. Finally, a novel technique that allows the assembly of different types of latex particles into ordered multi-component clusters, 'superparticles' has been introduced. The main ideas is to control the size and the composition of the supraparticles during their assembly by gathering and confining their components in a restricted, colloid-size space. Emulsion droplets can be used to provide their restricted space. (C) 1999 Elsevier Science B.V. All rights reserved.