Microfluidic device for electrically activated passive capillary stop valve

A microfluidic device for electrically activating a passive capillary stop valve comprising:

• an output channel;
• a first channel for containing a first fluid, wherein the first channel comprises a first interface with the output channel, and the first interface comprises:
• a first capillary stop valve;
• and a second channel for containing a second fluid, wherein the second channel comprises a second interface with the output channel, and the second interface comprises a second capillary stop valve, wherein the first channel and the second channel are electrically isolated from each other, and wherein the first interface and the second interface are arranged relative to each other such that when the first fluid is present in the output channel due to activation of the first capillary stop valve when the first fluid and the second fluid are present, and an electrical potential difference is configured to be applied between the first fluid and the second fluid, the first fluid contacts the second interface and is configured to activate the second capillary stop valve of the second interface thereby establishing fluid flow from the second channel into the output channel.