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373 results on '"Yang, Zhengbao"'

1. Triboelectric Junction: A Model for Dynamic Metal-Semiconductor Contacts

Author

Xu, Xiaote, Wang, Zhong Lin, and Yang, Zhengbao

Subjects
Physics - Applied Physics
Abstract

Static metal-semiconductor contacts are classified into Ohmic contacts and Schottky contacts. As for dynamic metal-semiconductor contacts, the in-depth mechanism remains to be studied. We here define a "triboelectric junction" model for analyzing dynamic metal-semiconductor contacts, where a space charge region induced by the triboelectric effect dominates the electron-hole separation process. Through theoretical analysis and experiments, we conclude that the triboelectric junction affects the electric output in two aspects: 1) the junction direction determines the output polarity; 2) the junction strength determines the output amplitude. The junction direction and junction strength are both related to the electron-affinity difference between the contact metal and semiconductor. We find that the standard electrode potential in electrochemistry best describes the electron affinity of a dynamic metal-semiconductor contact.

Published
2023

9. Self-charging electrostatic face masks leveraging triboelectrification for prolonged air filtration

Author

Peng, Zehua, Shi, Jihong, Xiao, Xiao, Hong, Ying, Li, Xuemu, Zhang, Weiwei, Cheng, Yongliang, Wang, Zuankai, Li, Wen Jung, Chen, Jun, Leung, Michael KH, and Yang, Zhengbao

Subjects
Chemical Engineering, Engineering, Aging, Masks, Static Electricity, Filtration, Air Filters, Textiles
Abstract

Electrostatic adsorption is an important complement to the mechanical filtration for high-efficiency air filtering. However, the electrostatic charge decays with time, especially in humid conditions. In this work, a self-charging air filter is presented to capture airborne particles in an efficient and long-lasting manner without the need of external power sources. Leveraging the triboelectric effect between the electrospun poly(vinylidene fluoride) nanofiber film and nylon fabric, the self-charging air filter-based mask excited by breathing can continuously replenish electrostatic charges. As a result, its effective lifespan is up to 60 hours (including 30 hours of wearing), with a minimum filtration efficiency of 95.8% for 0.3-μm particles. The filtration efficiency and lifespan are significantly higher than those of a commercial surgical mask. Furthermore, we uncover the quantitative relation between filtration efficiency and surface electrostatic potential. This work provides an effective strategy to significantly prolong the electrostatic adsorption efficacy for high-performance air-filtering masks.

Published
2022

17. Experimental Investigation of Coil Thickness in Electromagnetic Energy Harvesters for Power Density Improvement

Author

Peng, Yan, Zhang, Lan, Li, Zhongjie, Luo, Jun, Xie, Shaorong, Pu, Huayan, Yang, Zhengbao, Liu, Yong, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Jing, Xingjian, editor, Ding, Hu, editor, and Wang, Jiqiang, editor

Published
2022
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27. A Magnet‐Driven Soft Bistable Actuator

Author

Chen, Zhou, primary, Kong, Shangcheng, additional, He, Yunhu, additional, Chen, Shiting, additional, Wang, Wanying, additional, Jin, Lihan, additional, Zhang, Shun, additional, Hong, Ying, additional, Pan, Lulu, additional, Wu, Haikun, additional, Xie, Youneng, additional, Linghu, Changhong, additional, Mao, Zhengyi, additional, Yang, Zhengbao, additional, Chan, Chi Hou, additional, Song, Jizhou, additional, and Lu, Jian, additional

Published
2024
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35. A 2D Heterostructure‐Based Multifunctional Floating Gate Memory Device for Multimodal Reservoir Computing

Author

Zha, Jiajia, primary, Xia, Yunpeng, additional, Shi, Shuhui, additional, Huang, Haoxin, additional, Li, Siyuan, additional, Qian, Chen, additional, Wang, Huide, additional, Yang, Peng, additional, Zhang, Zhuomin, additional, Meng, You, additional, Wang, Wei, additional, Yang, Zhengbao, additional, Yu, Hongyu, additional, Ho, Johnny C., additional, Wang, Zhongrui, additional, and Tan, Chaoliang, additional

Published
2023
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45. VIV array for wind energy harvesting.

Author

Chen, Shilei, Wang, Yuanyi, Song, Rujun, Gao, Yongsheng, Wang, Zuankai, and Yang, Zhengbao

Subjects
WIND power, ENERGY harvesting, FLUID-structure interaction, VORTEX shedding, PIEZOELECTRIC transducers, WIND speed
Abstract

Harvesting energy from flow using vortex-induced vibration (VIV) piezoelectric transducers has gained significant attention in recent decades due to their advantages, such as simple structure, blade-less layout, and low maintenance costs. However, most existing studies have focused on designing and analyzing a single piezoelectric energy harvester (PEH), without investigating the fluid-structure interaction and coupling of multiple PEH arrays. Here, we conducted an experimental study using a 2 × 2 PEH array to investigate its dynamic response under different wind speeds and spacings. Results show that the output voltage of the PEH array increases as the vertical spacing decreases, and the maximum average output voltage of 20.6 V per PEH is obtained when the minimum vertical spacing, maximum horizontal spacing, and resonance wind speed conditions are met. Compared to a single PEH, the 2 × 2 array arrangement increases the average output voltage by up to 168%. Additionally, the average output power under the resistance of 1 MΩ increases by 629% to 4.3×10−4 W per PEH, and the maximum output power increases by 792% to 5.3×10−4. Experiments indicate that the vortex shedding coupling can induce higher vibration in a well-defined array, which paves a new way for developing bladeless wind farms. [ABSTRACT FROM AUTHOR]

Published
2024
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