2016 Volume 24 Pages 19-23
In order to realize the control of dispersion state and the alignment structure of multi-component particles in highly concentrated metal pastes, a processing route to simultaneously attach functional nanoparticles on metal fine particles and to stabilize metal particles in solvents has established. Using SiO2 nanoparticles as model nanoparticles, their surface was first modified with a complex of polyethyleneimine and oleic acid (PEI-OA), which is expected to be a useful dispersant that can be attached on various species of particles and to stabilize particles in non-aqueous solvents. Then, bare Ni fine particles were simply added into the PEI-OA modified SiO2 nanoparticle/toluene dispersion. Based on this simple mixing process, it was found that surface modified SiO2 nanoparticles can attached on Ni fine particles through PEI-OA and the obtained Ni/SiO2 composites can be stabilized in toluene even under highly concentrated conditions.