2022 Volume 59 Issue 3 Pages 108-114
In the field of non-equilibrium science, the Liesegang phenomenon is well-known as a particle formation process involving the diffusion of precursor chemicals. From a chemical engineering perspective, our research group had previously applied this method to synthesize metal nanoparticles and found that when Au ions diffuse unidirectionally into a gel containing a reductant, bands of Au nanoparticles are formed in a striped pattern. However, metal species other than Au have not yet been investigated. In this study, we synthesized nanoparticles of other metal species (Pt and Pd) using a similar process and compared the results with those of the Au nanoparticles to clarify the particle formation mechanism. The findings showed that the band patterns that were formed vary according to the metal species. Furthermore, the bands formed in each metal species were reproduced by using a mathematical model capable of representing the diffusion of ions and the formation of particles.
