Electrowetting on ZnO nanowires |
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| Authors: | Jun Wu Jun Xia Wei Lei Bao-Ping Wang |
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| Institution: | (1) Department of Electrical Engineering and Computer Science and Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA, USA;(2) Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA, USA;(3) Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA, USA;(4) Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA, USA;(5) Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 02139 Cambridge, MA, USA |
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| Abstract: | In this paper, we study the electrowetting character on ZnO nanowires. We grow the ZnO nanowires on indium tin oxide (ITO)
by a hydrothermal method, and the ZnO nanowires surface is further hydrophobized by spin-coating Teflon. Such a prepared surface
shows superhydrophobic properties with an initial contact angle 165°. When the applied external voltage between the ITO and
the sessile droplet is less than 50 V, the contact angle continuously changed from 165° to 120°, and exhibits instant reversibility.
For a slightly higher voltage, a mutation of the contact angle changing to 100° was observed and the contact angle was not
reversible after removing the applied voltage, which indicates a transition from non-wetting state to wetting state. Further
increasing of the applied voltage, the apparent contact angle decreased to an invariable value 70°, and electrical breakdown
emerged synchronously. |
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