Microfluidic devices with capillary dilutors

A method of mixing liquids, the method comprising:

• providing a microfluidic device including:
• two areas arranged side-by-side, including a first area delimited by a first liquid pinning barrier, and a second area delimited by a second liquid pinning barrier that extends parallel to the first liquid pinning barrier, whereby the first liquid pinning barrier and the second liquid pinning barrier delimit a corridor between the two areas;
• and
• a trigger channel, wherein the trigger channel branches from the second area, extends through the corridor between the two areas, and connects the first liquid pinning barrier with the second liquid pinning barrier, and
• introducing:
• a first liquid into the first area for the first liquid to get pinned at the first liquid pinning barrier, and
• a second liquid into the second area for the second liquid to get pinned at the second liquid pinning barrier and then fill the trigger channel, so that the first liquid pinned at the first liquid pinning barrier and the second liquid pinned at the second liquid pinning barrier are contacted, each, by a reverse flow of the second liquid in the trigger channel, and thereby the first liquid and the second liquid start mixing at a level of the corridor.