NANOSIZED PARTICLES MADE IN COLLOIDAL ASSEMBLIES

In this feature article, syntheses of nanosized particles by using col loidal assemblies as a template are described. We asked ourselves the following question: What parameters play a role in the control of the size, shape, and polydispersity? We know that parameters such as the s hape of colloidal assemblies, the hydration of the head polar group, t he water molecules bounded to the interface, etc. play a major role. H owever, there are a number of exceptions preventing any generalization . It is shown that the chemical mechanism in nanoparticles production in colloidal assemblies can differ from those usually observed in homo geneous solution. This shows that the solution chemistry cannot always be transferred to colloidal systems. It is possible to select the siz e and markedly reduce the polydispersity by a surface treatment of the nanoparticles. This favors formation of mono- and multilayers made of nanoparticles, and it is found that these particles form crystals org anized in a three-dimensional face-centered cubic superlattice.