I think "particle-wave duality" is a bit of an old-fashioned idea that needs to go away. It is true in the sense that we can choose to describe the behavior of elementary particles from both a quantum view point and a Newtonian viewpoint, but that doesn't mean that things (e.g., electrons) are literally particles and waves at the same time or depending on the situation. It's waves all the way down--waves with momentum and kinetic energy and attractive and repulsive forces, just like what we think of as "particles."