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A superhydrophobic membrane of MnO2 nanotube arrays on which a water droplet can be immobilized by application of a small DC bias, despite a large contact angle, is reported. For a 3 μL water droplet, the measured adhesive force increases monotonically with increasing negative voltage, reaching a maximum of 130 μN at 22 V, 25 times the original value. It follows that the nearly spherical water droplet...
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