  We investigated the dynamics of a binary mixture confined within van der
Waals (vdW) walls using molecular dynamics simulations. We discovered a novel
phenomenon named perpendicular separations of two phases (PSTP). In the initial
stage, central water molecules diffused, subsequently condensing symmetrically
within the confinement's mid-plane. In the later stage, as water droplets
nucleate and grow, the resin separates perpendicularly into two films due to
the action of bubblers and vdW walls, resulting in a hollow nanochannel. The
mechanisms and conditions underlying PSTS are discussed. The results indicate
that the concentration (C) of resin in the middle region is linearly decreased
with temporal power. We propose a new mechanism for stabilizing nanochannels
and films: dynamic "soft pillars" that prevent Rayleigh-like instability. Our
findings could shed light on the manufacture of nanofilms and organic
nanochannels, which could help advance bio-detection and energy fields.
