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초소수성 메쉬에서의 액적 충돌을 통한 마이크로 액적의 표면전하 및 크기 제어
최정환(Jeong-Hwan Choi),고영수(Young-Su Ko),장순민(Soon-Min Jang),최동휘(Dong-Whi Choi),이충엽(Choong-Yeop Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this study, we demonstrate the generation of microdroplets by impinging a single water drop onto hydrophobic mesh. Depending on the impact velocity and mesh type, we show that the size and number of microdroplets vary, and they are analyzed through the image analysis. More importantly, it is found that the total electric charge of microdroplets is commensurate with the total surface area of microdroplets, while the hydrophobic coating on the mesh directly affects the polarity and magnitude of surface charge. By testing with three different types of hydrophobic coating (silane, iCVD, Teflon) of the mesh, we obtain up to 7 times increase of the surface charge compared with that of a single water drop before the impingement onto the mesh. Finally, we demonstrate that this significant increase of the surface charge can be utilized to improve the voltage generation performance of the droplet-based triboelectric nanogenerator.
초소수성 메쉬에서의 액적 충돌을 통한 마이크로 액적의 표면전하 및 크기 제어
최정환(Jeong-Hwan Choi),고영수(Young-Su Ko),장순민(Soon-Min Jang),최동휘(Dong-Whi Choi),이충엽(Choong-Yeop Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this study, we demonstrate the generation of microdroplets by impinging a single water drop onto hydrophobic mesh. Depending on the impact velocity and mesh type, we show that the size and number of microdroplets vary, and they are analyzed through the image analysis. More importantly, it is found that the total electric charge of microdroplets is commensurate with the total surface area of microdroplets, while the hydrophobic coating on the mesh directly affects the polarity and magnitude of surface charge. By testing with three different types of hydrophobic coating (silane, iCVD, Teflon) of the mesh, we obtain up to 7 times increase of the surface charge compared with that of a single water drop before the impingement onto the mesh. Finally, we demonstrate that this significant increase of the surface charge can be utilized to improve the voltage generation performance of the droplet-based triboelectric nanogenerator.