This project presents a cost-effective proof-of-concept device that utilizes acoustic waves to generate microscale droplets, pivotal in microfluidics for precise substance manipulation. Leveraging a piezoelectric element (PZT) and a linear solenoid actuator, the device breaks the surface tension of a small body of fluid at the outlet of a small nozzle. The design is driven by the equation |Δh| ≤ 2σ/ρga, where Δh is the distance between the inlet and outlet of the fluid, σ and ρ are the surface tension and density of the fluid, g is the gravitational constant, and a is the radius of the nozzle outlet. Results demonstrate an average droplet volume of 2 μl, with the prototype being at least 5 times more affordable than competing methods. This achievement signifies a substantial advancement in affordable and accessible droplet generation technology for various applications, including portable diagnostics and biotech research.

Design a proof-of-concept device that utilizes acoustic waves and cost-effective manufacturing methods to generate droplets less than 40 microliters (μl) in volume.