Hello, my name is Namsoon, I'm a postdoc from Lund University in Sweden. My poster is about the centering mechanism of causal nanoparticles. Centering of nanoparticle is important because how the shape and the structure of nanoparticle change due to centering has huge impact on the performance of the functional nanoparticles in given applications. Centering mechanisms of pure crystalline metal nanoparticles had been investigated previously, but there was no study on particles that have crystalline metal core with amorphous metal oxide shell. And because these metal metal oxide core shell system itself is gathering much attention as a functional nanoparticle, we studied their centering behavior by using molecular dynamics. So we prepared three different types of metal, metal oxide, causal nanoparticles, which exhibit crystalline core and amorphous metal oxide shell after equilibrium at given temperatures. Then we let the nanoparticles merge and coalesce together and studied how the atoms diffuse during the centering process. Here it shows how to nickel oxide core and nanoparticles coalesce over a period of time. And for the other two types of nanoparticles as well. A common feature we observed in all three types of nanoparticles is that the core atoms do not diffuse across the boundary zone between the two clusters, and the surface atoms do not diffuse onto the other side of the nanoparticle surface either. But of course if we plot and compare the mean square displacement, MST of surface atoms and core atoms, we can see that the surface atoms are the one diffuse more and therefore contribute to the centering processes. So in that sense, the mechanism here was similar to that of the pure crystalline metal nanoparticles. One thing that was quite interesting was that when we traced the atomic trajectory, we could see that the diffusion was highly localized. What we mean by that is, as we can see here, for example, we are tracing the atoms that are far away from the contact region, and we can see that the atoms remain pretty much where they were while the centering progress is quite significantly. And this is quite contrasting to the commonly known concept of the high mobility of liquid-like surface atoms and surface diffusion of nanoparticles. Thank you for watching and for more detailed information, please read my poster.