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High dry friction requires intimate contact between two surfaces and is generally obtained using soft materials with an elastic modulus less than 10 MPa. We demonstrate that high-friction properties similar to rubberlike materials can also be obtained using microfiber arrays constructed from a stiff thermoplastic (polypropylene, 1 GPa). The fiber arrays(More)
A comprehensive theory addresses the potential for nanoscale energy harvesting with an array of vertically aligned zinc oxide (ZnO) nanoribbons. Through shear-mode piezoelectric coupling, the nanoribbons are capable of generating electricity from elastic deformations induced by sliding friction or mechanical vibration. In contrast to current ZnO nanowire(More)
A theory is developed to explain the spontaneous bending of polar 7 ð0 0 0 1Þ faceted wurtzite nanoribbons, including the widely studied case of zinc oxide (ZnO) nanoarcs and nanorings. A rigorous thermodynamic treatment shows that bending of these nanoribbons can be primarily attributed to the coupling between piezoelectric effects, electric polarization,(More)
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