Heard of #electrowetting ?
WIthout getting in too deep, a diaelectric plate with a #matrix of electrodes when 1+ are provided a current can control droplets of various substances
Move, #mix, separate, etc
Routing of droplets moved like packets to network
Grid shape can heavily impact potential functionality; video demonstrates 1 way a router or parallel operations could work
Creation of this equipment is not expensive and #foss