We discuss a set of smart micropumps that sense their surrounding environment and respond accordingly. First we have shown photoacid crystallites function as micropumps in the presence of UV light, via diffusiophoresis, which can be turned �on/off� in a controlled manner. The pump can be restarted multiple times simply by reillumination. Electroosmotic component was distinguished from diffusiophoretic component and quantified. We also demonstrated this pump can be used for patterning. Secondly, we showed a Schiff base too can work as a micropump in acidic environment wherein the velocity can be controlled by controlling the pH and in-turn the ion gradient; the highest velocities being achieved at the lowest pH. Further, we combined the photoacid and Schiff base simulating a source-drain set-up and both spatial and temporal control over velocities was achieved. 

Design of UV-controlled "on/off" microfluidic pumps

244th National Meeting (2012)

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