It is actually possible to dispense some types of powders using a piezoelectric dispenser. If the particles are small enough they can be aspirated into the piezoelectric nozzle (using a syringe pump), then the piezo actuator can drive the dispensers.
A – The piezoelectric tip moves above the powder sample before aspiration. B – Powder sample gets loaded into tip by aspiration effect driven by an attached syringe pump. C – Small amounts of powder is dispensed out of piezoelectric nozzle using piezoelectric actuation (by drop on demand effect). The more actuation the more powder dispensed