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To better evaluate the performance of the TENG-driven e-jet printing process, a comparison study with the DC-driven process was conducted. With the same experimental setup, a DC voltage of 2000 V and a nozzle-to-substrate distance of 1 mm was applied to achieve stable ink jetting, whose printing results using different nozzles and moving speeds are presented in Figure 55. Based on the comparison of Figure 55a and Figure 53, the DC- driven jetting process produced all line features even at the highest moving speed of our robotic arm (15 cm/s), while the TENG-driven jetting process could generate dot features at smaller moving speeds (10 cm/s). This indicates that a DC power supply, compared to our TENG, would give a much higher droplet jetting frequency. It could also be expected that by increasing the operation frequency of TENG, the printing results would become more similar with the DC-driven results. The motor rotation speed, i.e. TENG operation frequency, provides a facile method of controlling the droplet jetting frequency and the printed feature pattern (line or dot), especially in the case where nozzle moving speed is limited. A more quantitative comparison of the printed feature sizes (Figure 55b and Figure 54a) showed that the printed resolution using TENG is comparable with that using a DC power supply. Therefore, the TENG-driven e-jet printing process offers a promising alternative to conventional ones, not only with comparable resolution, but also with additional merits including low cost, extra safety, better feature controllability at low printing speeds, etc. 145PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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