The manufacturing of colloidal systems has expanded a lot in recent decades and new products are
being placed on the market all the time. Also the word nano-materials works almost like a magic formula
nowadays and scientist all over the world investigate the properties and look for applications for these
marvelous substances. Manufacturers keep developing new techniques and improving the old ones in
order to produce the best possible material. In this process the issue of colloid stability is often crucial as,
for example, face-cream or lotion must look as a homogeneous dispersion and not as an unpleasant
mixture of water and fat. Whereas the stability of the dispersion achieved by preventing the colloid
particles to agglomerate is needed in some products, on the contrary other applications demand the
agglomeration process. For instance, in water treatment the removal of the contaminants is necessary and
any speed-up of this operation achieved by controlling the system parameters is helpful.