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Active and passive microflow control has been demonstrated using gel formation by dilute aqueous solutions of triblock copolymers at elevated temperatures. Solutions of a poly(ethylene oxide) 106 -poly(propylene oxide) 70 -poly(ethylene oxide) 106 polymer, which has the trade name Pluronic® F127, have been used as a sample system. Flow in a microchannel has been stopped in less than 33 ms by introducing heat with an integrated electric heater. Viscous heating under high shear rates also inducesdoi:10.1109/jmems.2004.839330 fatcat:luuodfjokjfc3oso2rfe5uksdy