Abstract
The shape and size of barium compound nanoparticle were controlled by utilizing the water-in-oil microemulsion as nanometer-sized reaction fields. The barium chromate particles as model particles were synthesized using the water-in-oil microemulsion. A bundle of the nanowires, chain structure of the nanorods, superlattice structure of the nanodots, and dispersed nanodots were successfully synthesized by changing the liquid-phase concentrations of starting materials. It is main factor that the crystal growth is suppressed by the surfactant absorbed selectively onto the specific crystal faces of barium chromate. Because of hydrophobic interactions between the surface-anchored surfactant chains, the higher order structures were formed by the self-organization of the nanoparticle. Finally, it was emphasized that the supersaturation ratio and the particle-surfactant interaction were important factors for controlling the shape and size of the inorganic nanoparticles.
