Piezoelectric dispensing (inkjet) small amounts of powders

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. 

labbot 3d printer powder dispensing using piezoelectric inkjet nozzle

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

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