  Confinement has been suggested as a tool to tune the self-assembly properties
of nanoparticles, surfactants, polymers and colloids. In this way, we explore
the phase diagram of Janus nanoparticles using Molecular Dynamics simulations.
The nanoparticle was modeled as a dimer made by one monomer that interacts by a
standard Lennard Jones potential and another monomer that is modeled using a
two-length scale shoulder potential. This specific design of nanoparticle
exhibits in bulk distinct self-assembled structures and water-like diffusion
anomaly. Our results indicate that besides the aggregates observed in bulk, new
structures are observed under confinement. Also, the dynamic and thermodynamic
behavior of the fluid phase are affected. The systems show a reentrant fluid
phase and density anomaly. None of these two features were observed in bulk.
Our results show that geometrical confinement leads to new structural,
thermodynamical and dynamical behavior for this Janus nanoparticle.
