Delay Valving in Capillary Driven Devices Based on Dissolvable Thin Films

This work presents passive time delay valves for micro channels in two different working modes for microfluidic on chip timing. The delay valve designs are compatible with conventional lamination techniques for microfluidics and allow to pre-program advanced sequential operations independent from the geometries of the microfluidic system. The time delay of the dissolvable valves ranges from 1.2 s up to 36 s per valve resulting in a time range from 1.2 seconds up to 11 minutes for 19 serial valves.