  One of the most promising applications in nanoscience is the design of new
materials to improve water permeability and selectivity of nanoporous
membranes. Understanding the molecular architecture behind these fascinating
structures and how it impacts the water flow is an intricate but necessary
task. We studied here, the water flux through multi-layered nanoporous
molybdenum disulfide (MLNMoS$_2$) membranes with different nanopore sizes and
length. Molecular dynamics simulations show that the permeability do not
increase with the inverse of the membrane thickness, violating the classical
hydrodynamic behavior. The data also reveals that the water dynamics is slower
than that observed in frictionless carbon nanotubes and multi-layer graphene
membranes, which we explain in terms of an anchor mechanism observed in between
layers. We show that the membrane permeability is critically dependent on the
nanopore architecture, bringing important insights into the manufacture of new
desalination membranes.
