Supported heterogeneous catalysts: what controls cobalt nanoparticle dispersion on alumina?

We investigate how a no. of phys. parameters control the rate and pattern of nanoparticle assemblage onto a com. available alumina surface. 8 nm ε-Co nanoparticles supported on polycryst. alumina are found to have areas of both good dispersion and areas of aggregation.  A similar pattern of dispersion was also obsd. for larger (∼30 nm) polycryst. ferromagnetic ε-Co nanoparticles.  Acid and base treatment of the amphoteric support material prior to the assemblage process is found to have little impact on dispersion of the particles.  Using a nonpolar solvent for the assemblage process eliminates the effect of zeta potential and allows for rapid attachment of particles to the support.  Performing the assemblage in a polar solvent is found to significantly decrease the rate of the particle attachment to the support.  Despite the slower attachment of particles, there is no impact on the nanoparticle distribution pattern.  In contrast to the mixed dispersion obsd. when assembling nanoparticles on an alumina support, ε-Co nanoparticles are found to disperse uniformly across an ordered mesoporous MCM-41 silica support.  It seems likely that a specific chem. interaction between the support surface and nanoparticle are dictating the assemblage process.