  Graphene nanoslit pore is used for nanofluidic devices like water
desalination, ion-selective channels, ionic transistors, sensing, molecular
sieving, blue energy harvesting, and protein sequencing. It is a strenuous task
to prepare nanofluidic devices because a small misalignment leads to a
significant alteration in various properties of the devices. Here we focus on
the rotational misalignment between two parallel graphene sheets. Using
molecular dynamics simulation, we probe the structure and dynamics of monolayer
water confined inside graphene nanochannels for a range of commensurate twist
angles. With SPC/E and TIP4P/2005 water model, our simulations reveal the
independence of equilibrium number density $(n \sim 13 nm^{-2})$ for SPC/E and
$(n \sim 11.5 nm^{-2})$ for TIP4P/2005) across twists. Based on the respective
densities of water models, the structure and dielectric constant are invariant
of twist angles. The confined water structure at this shows square ice ordering
for SPC/E water only. TIP4P/2005 shows ordering at the vicinity of a critical
density $(n \sim 12.5 nm^{-2})$. The average perpendicular dielectric constant
of the confined water remains anomalously low ($\sim 2$ for SPC/E and $\sim 6$
for TIP4P/2005) for studied twist angles. We find that the friction coefficient
of confined water molecules varies for small twist angles while becoming
independent for twists greater than $5.1^{o}$. Our results indicate that small
angular misalignment will not impair the dielectric properties of monolayer
water within graphene slit-pore but can significantly influence its dynamics.
