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vi When bringing two different materials into contact, the difference in triboelectric potentials between the materials results in electric charging. To increase the under- standing of triboelectricity, a two-level Schottky model, assuming ion transfer, was developed to describe the temperature dependence of the triboelectric effect for a TENG. The two levels correspond to the binding energy for ions on the two surfaces that are brought into contact, where the difference in binding energy enters the Boltz- mann distribution. The model describes the decreasing triboelectric effect in TENGs with increasing temperature as described in the literature, and results in a separation energy, which is of the right order of magnitude for physically adsorbed atoms. It was recently demonstrated that TENGs can convert wind energy into electrical energy. Here, a TENG based on a plastic film fluttering between two copper elec- trodes was constructed. It was found that the frequency of the the fluttering film increases linearly with the wind speed. TENG:s designed in this way generate elec- tricity already at low wind speed, and we therefore expect such TENGs to be useful both as generators and speed sensors in the future. While quantum mechanics is of importance in a limited number of nanomechan- ical systems, nanocontacts have a broader meaning, and are crucial for the under- standing of triboelectric phenomena. We anticipate that the findings in this thesis will contribute to a better understanding of nanomechanics, in particular the mech- anism of triboelectricity.PDF Image | Nanomechanics Quantum Size Effects, Contacts, and Triboelectricity
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