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diffusion rate and electric field direction applied to both R6G and MB and fit well with our expectation. A positive current could accelerate the flow of positively charged dye molecules in the PBS solution from the donor cell to the acceptor cell. Meanwhile, an opposite current would hinder the diffusion of dye molecules driven by concentration difference, resulting in a smaller diffusion rate. The effects of TENG operation frequency on the diffusion rate were studied as well. Figure 29e shows the current flowing through the diffusion cell when the TENG operated at different frequencies. Higher operation frequency brought higher number and larger amplitude of current peaks, which would result in a larger driving force for the electrophoretic flow and thus a faster diffusion rate of the targeted molecules, as evidenced by the amount of transported R6G in Figure 29f after 30 minutes of TENG operation at different frequencies. 3.2.3 Hydrogel-Based Iontophoretic Drug Patch for TDD To realize the proposed self-powered iontophoretic TDD in a non-invasive manner, a hydrogel-based drug patch was rationally designed and fabricated (Figure 30a). The drug patch consists of two side-by-side hydrogel cells and two embedded carbon-cloth electrodes in a PDMS frame. Therapeutic agents are pre-loaded into one of the hydrogel cells during fabrication. Owing to its soft mechanical property and biocompatibility, hydrogel has been widely adopted as the delivery media for iontophoresis. Along with soft PDMS as the main substrate, the whole device could conformably attach to the skin and enable drug release imperceptibly with minimal discomfort. 83PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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