Figure 4.

Droplet chip: (a) Layout of the focused flow droplet generator (45 mm long, 15 mm wide), with channel width 500 μm, channel depth 100 μm, nozzle width 160 μm, and nozzle depth 60 μm. (b) Formation of oil droplets in water, which is the experiment being performed by learners using the chip in Figure 1. The chip is produced from borosilicate glass, using positive resist and a wet etching (HF) technique.