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(a) Schematic representation of the TENG-based tri-layer mask. (b) Triboelectric voltage generated on this tri-layer system measured using a similar set as shown in Fig. 3a. (c–e) permeation test conducted using particulate materials having sizes <10 μm using different masks (empty represents without any mask in the measurement system discussed before): (c) <0.5 μm (0.3–0.5 μm), (d) 0.5–1 μm and (e) 1–2.5 μm.
