Patent ID: 8252159

Claim:
Device for the controlled movement of liquid, comprising a substrate ( 20 ) in which a microchannel ( 10 ) is formed, said device comprising: a first electrically conductive liquid (F 1 ) partially filling the microchannel ( 10 ) in the longitudinal direction of the microchannel ( 10 ), a dielectric fluid (F 2 ) located downstream of said first liquid (F 1 ) in the longitudinal direction of the microchannel ( 10 ), forming a first interface (I 1 ) with the first liquid (F 1 ), or forming a first interface (I 1 ) with the first liquid (F 1 ) and a second interface (I 3 ) with a second liquid (F 3 ) situated downstream of said fluid (F 2 ), and means of moving the first liquid (F 1 ) by electrowetting, characterised in that the controlled movement device comprises a capacitive measuring device for controlling the movement of the first liquid (F 1 ) according to the capacitance measured, said capacitive measuring device being adapted to determine the position of the first interface (I 1 ) or the second interface (I 2 ).