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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS

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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS ( high-performance-triboelectric-nanogenerator-and-its-applica )

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consists of four capacitors of 4.7 nF and four HV diodes as highlighted in Figure 51c. Such a setup with 5 boost units achieved an open-circuit DC voltage above 1 kV. Figure 51. TENG-driven e-jet process. (a) Schematic of the proposed process. (b) Working mechanism of the sliding freestanding TENG. (c) Equivalent electrical circuit model of the boost circuit. Reproduced with permission.225 Copyright 2019, Wiley-VCH. The nozzle-to-substrate distance is critical in the e-jet printing process. As shown in Figure 52a with a nozzle size of 340 μm, when the distance was too small (~0.5 mm), the ink would deform and contact the substrate without droplet formation; when the distance was too large (~2.5 mm), the jetted droplets would breakup and thus a spray, rather than a series of drops, would be collected on the substrate, which is exactly the case for electrospraying.226 Only with a proper distance (~1 mm), a stable stream of ink droplets could be ejected onto the substrate to achieve desirable printing resolution. To further validate the e-jet process driven by TENG, its droplet formation and ejection process was recorded using a high-speed camera (nac Image Technology, MEMRECAM HX-7), with one complete cycle shown as in Figure 52b and Figure 52c for a motor rotation speed of 139

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