Pattern Formation during Phase Separation by Radial Quenching at the Base of a Three-Dimensional Box

摘要

It is well known that a droplet pattern is formed during phase separation when the composition of a binary system is asymmetric. Recently, it was reported that concentric and dendritic patterns can be observed in a two-dimensional model system when phase separation is induced by quenching radially outwards from a predefined center [R. Kurita, Sci. Rep. 7, 6912 (2017)]. In this work, we restrict control of the temperature to the bottom surface in a three-dimensional numerical simulation. This is significantly closer to a real experiment. We observe a layer pattern in the z-direction, and find that its formation is closely related to the dynamics of phase separation and is unique to a three dimensional system. In addition, we find that the thickness of the layers depends on the radial quenching velocity.