FIG. 2.

Examples of basic microfluidic devices built from the kit presented here. (a) A straight channel with laminar flow. (b) 3 colored water streams are flown into a four-way-junction simultaneously and only mix slowly towards the outlet due to diffusion. (c) T-junction generation of water-in-oil droplets. Drop size inside the channel shown here is about 2.4 mm long and contains 2.3 μl per drop. This drop will have a diameter of about 800 μm in an open well (see also Figs. 3 and 4). (d) Characterization of droplet generation in a T-junction: At steady aqueous flow rate (here 0.1 ml/min), an increased oil flow rate results in smaller drops. The arrows indicate the flow direction. Scale bars are 5 mm. n = 10 for each flow rate.