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376 results on '"Yang, Zhengbao"'

102. Engineering Dental Tissues Using Biomaterials with Piezoelectric Effect: Current Progress and Future Perspectives.

Author

Ghosh, Sumanta, Qiao, Wei, Yang, Zhengbao, Orrego, Santiago, and Neelakantan, Prasanna

Subjects
PIEZOELECTRICITY, BIOMATERIALS, ELECTRIC charge, TISSUE engineering, PIEZOELECTRIC materials, SMART materials
Abstract

Dental caries and traumatic injuries to teeth may cause irreversible inflammation and eventual death of the dental pulp. Nevertheless, predictably, repair and regeneration of the dentin-pulp complex remain a formidable challenge. In recent years, smart multifunctional materials with antimicrobial, anti-inflammatory, and pro-regenerative properties have emerged as promising approaches to meet this critical clinical need. As a unique class of smart materials, piezoelectric materials have an unprecedented advantage over other stimuli-responsive materials due to their inherent capability to generate electric charges, which have been shown to facilitate both antimicrobial action and tissue regeneration. Nonetheless, studies on piezoelectric biomaterials in the repair and regeneration of the dentin-pulp complex remain limited. In this review, we summarize the biomedical applications of piezoelectric biomaterials in dental applications and elucidate the underlying molecular mechanisms contributing to the biological effect of piezoelectricity. Moreover, we highlight how this state-of-the-art can be further exploited in the future for dental tissue engineering. [ABSTRACT FROM AUTHOR]

Published
2023
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103. A Wide-bandwidth Nanocomposite-Sensor Integrated Smart Mask for Tracking Multi-phase Respiratory Activities for COVID-19 Endemic

Author

Suo, Jiao, primary, Liu, Yifan, additional, Wu, Cong, additional, Chen, Meng, additional, Huang, Qingyun, additional, Liu, Yiming, additional, Yao, Kuanming, additional, Chen, Yangbin, additional, Pan, Qiqi, additional, Chang, Xiaoyu, additional, Chan, Ho-yin, additional, Zhang, Guanglie, additional, Yang, Zhengbao, additional, Daoud, Walid, additional, Li, Xinyue, additional, Vellaisamy, Roy, additional, Yu, Xinge, additional, Wang, Jianping, additional, and Li, Wen Jung, additional

Published
2022
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104. Droplet energy harvesting panel

Author

Xu, Xiaote, primary, Li, Pengyu, additional, Ding, Yongtao, additional, Xu, Wanghuai, additional, Liu, Shiyuan, additional, Zhang, Zhuomin, additional, Wang, Zuankai, additional, and Yang, Zhengbao, additional

Published
2022
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124. A droplet-based electricity generator with high instantaneous power density

Author

Xu, Wanghuai, primary, Zheng, Huanxi, additional, Liu, Yuan, additional, Zhou, Xiaofeng, additional, Zhang, Chao, additional, Song, Yuxin, additional, Deng, Xu, additional, Leung, Michael, additional, Yang, Zhengbao, additional, Xu, Ronald X., additional, Wang, Zhong Lin, additional, Zeng, Xiao Cheng, additional, and Wang, Zuankai, additional

Published
2020
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126. Electronic Skin from High-Throughput Fabrication of Intrinsically Stretchable Lead Zirconate Titanate Elastomer

Author

Liu, Yiming, primary, Zheng, Huanxi, additional, Zhao, Ling, additional, Liu, Shiyuan, additional, Yao, Kuanming, additional, Li, Dengfeng, additional, Yiu, Chunki, additional, Gao, Shenghan, additional, Avila, Raudel, additional, Chirarattananon, Pakpong, additional, Chang, Lingqian, additional, Wang, Zuankai, additional, Huang, Xian, additional, Xie, Zhaoqian, additional, Yang, Zhengbao, additional, and Yu, Xinge, additional

Published
2020
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134. RF Energy Harvesting for Intraoral Orthodontic Force Monitoring

Author

Li, Pengyu, Zhu, Luying, Ding, Yongtao, Long, Zhihe, Yang, Yanqi, Pan, Jia, Gu, Min, Wang, Wenping, and Yang, Zhengbao

Abstract

Optimal orthodontic forces need to be applied to induce appropriate biological and mechanical reactions in the periodontium, thus leading to proper tooth movements, while excessive orthodontic forces could harm the tooth roots and periodontal tissues during treatment. However, estimating orthodontic forces currently relies on clinical experience, lacking objective data and analysis; thus monitoring the in-vivo orthodontic force is essential to reducing side effects and improving orthodontic treatment. Unfortunately, in-vivo orthodontic force sensor systems are currently not available, and in-vitro ones are mostly bulky and costly. Here, we report a battery-free and wireless orthodontic force sensing system (BWS) designed for in-vivo, contactless, and real-time measurement of the orthodontic force. We developed a 915MHz far-field RF energy harvesting system to power the intraoral BWS, and achieved an in vivo wireless measurement distance of 220mm. This system allows in-vivo orthodontic force monitoring at anytime and anywhere, so it can be applied to improve clinical treatments and orthodontic research. Besides, in vivo experiments demonstrate that the system can harvest a voltage of 2V even at a 350mm distance, which highlights the device's potential to serve as a versatile platform for monitoring various oral environmental parameters through different sensors.

Published
2024
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137. Green Fabrication of Freestanding Piezoceramic Films for Energy Harvesting and Virus Detection

Author

Liu, Shiyuan, Liao, Junchen, Huang, Xin, Zhang, Zhuomin, Wang, Weijun, Wang, Xuyang, Shan, Yao, Li, Pengyu, Hong, Ying, Peng, Zehua, Li, Xuemu, Khoo, Bee Luan, Ho, Johnny C., and Yang, Zhengbao

Abstract

Freestanding lead-free piezoceramic thin films can be derived via water peeling. Thed33value of the freestanding BCZT thin film reaches 209 pm V−1. The freestanding piezoceramic films obtain versatile application scenarios such as energy harvest and virus detection.

Published
2023
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141. Achilles' new heel: Shock absorbing, gait assisting and energy harvesting.

Author

Pan, Qiqi, Long, Zhihe, Zhang, Zhuomin, Lin, Weikang, Zhang, Lingling, Bai, Songnan, Yang, Xiaodan, Liu, Shiyuan, Park, Yong-Lae, Chirarattananon, Pakpong, and Yang, Zhengbao

Abstract

Humans have evolved to walk highly efficiently to conserve energy, making it challenging to develop assistive and energy-harvesting devices for walking. Herein, we report a heel pad-based assistance device for walking that not only optimizes the energetic economy of walking and prevents plantar fasciitis but also harvests energy from heel impact. Our footwear-embedded device improves the walking economy by offering shock absorption and walking assistance, while simultaneously providing energy-harvesting functions. We demonstrate that the use of our device reduces the activation of the gastrocnemius and soleus muscles during the foot strike by 5.8 ± 1.0 % and 4.1 ± 0.6 %, respectively. The collisional energy conserved from the impact at the touchdown is transformed into 3.8 ± 0.3 watts of electrical power (mean ± SEM). Compared with walking in normal shoes, the energy savings with the device imply that walking endurance could be increased by as much as 10 % without extra effort from the wearer. Our findings demonstrate the potential of the heel pad-based device that enhances the energy economy of walking and human bipedal locomotion. [Display omitted] • Highly integrated footwear for shock absorbing, gait assisting, and energy harvesting. • A power density of 27.5 mW/cm3 (peak power: 3.8 Watts) is achieved for a single step. • Walking with the device does not significantly interfere with the normal gait pattern. • The footwear device shows stable durability and robustness in daily locomotion. [ABSTRACT FROM AUTHOR]

Published
2023
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146. Modeling and parametric study of a force-amplified compressive-mode piezoelectric energy harvester.

Author

Yang, Zhengbao, Zu, Jean, Luo, Jun, and Peng, Yan

Subjects
PIEZOELECTRICITY, ENERGY harvesting, ELECTRIC power, WAVE amplification, BANDWIDTHS
Abstract

Piezoelectric energy harvesters have great potential for achieving inexhaustible power supply for small-scale electronic devices. However, the insufficient power-generation capability and the narrow working bandwidth of traditional energy harvesters have significantly hindered their adoption. To address these issues, we propose a nonlinear compressive-mode piezoelectric energy harvester. We embedded a multi-stage force amplification mechanism into the energy harvester, which greatly improved its power-generation capability. In this article, we describe how we first established an analytical model to study the force amplification effect. A lumped-parameter model was then built to simulate the strong nonlinear responses of the proposed energy harvester. A prototype was fabricated which demonstrated a superior power output of 30 mW under an excitation of 0.3g ( g = 9 . 8 m/s2). We discuss at the end the effect of geometric parameters that are influential to the performance. The proposed energy harvester is suitable to be used in low-frequency weak-excitation environments for powering wireless sensors. [ABSTRACT FROM AUTHOR]

Published
2017
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147. Soybean-inspired nanomaterial-based broadband piezoelectric energy harvester with local bistability.

Author

Hao, Fengqian, Wang, Biao, Wang, Xu, Tang, Tao, Li, Yimeng, Yang, Zhengbao, and Lu, Jian

Abstract

Bistable nonlinear energy harvesters are effective structures for scavenging broadband energy from frequency-varying vibration sources. The bistable characteristic of such structures is typically induced by introducing magnetic fields, prestress, and nonuniform geometries or fixtures. However, the complicated structures or single deformation modes of these structures limit their practical application. Inspired by the structure of soybean pods, a bionic metallic nanomaterial-based bistable piezoelectric energy harvester is developed in this study. The nanoplate substrate with a local bistable region mimics the configuration of a soybean pod. To the best of the authors' knowledge, the local bistable configuration represents a novel energy harvesting strategy. The local bistable nanoplate is fabricated using a mature surface mechanical attrition treatment technique that generates a gradient nanostructure to enhance the mechanical properties of the bistable structure. The energy harvesting performance and nonlinear dynamic characteristics of the energy harvester are evaluated through frequency-sweep and fixed-frequency vibration tests and numerical simulations with a new two-step finite element (FE) model. The harvester characteristics in three vibration modes (single-well vibration (SV), intermittent cross-well vibration (ICV), and continuous cross-well vibration (CCV)) are discussed. The experimental and numerical results demonstrate that the voltage output and working bandwidth of the proposed harvester increase by five times in the ICV and CCV modes when the excitation acceleration increases from 0.5 g to 3.0 g. The bionic nanomaterial-based bistable piezoelectric energy harvester can be potentially used in various applications such as vehicle suspension systems, tires, and vehicle-bridge systems. [Display omitted] • Soybean pod-mimic nanoplate-based broadband bistable piezoelectric energy harvester for vibration energy harvesting. • Nanoplate with a local bistable region processed by a facile method of surface mechanical attrition treatment (SMAT). • Novel two-step FE model for analyzing local bistable/multistable problems. • Three vibration modes including single-well vibration, continuous cross-well vibration, and intermittent cross-well vibration. • 500% improvement in working bandwidth and voltage output generated by nonlinear cross-well vibrations of the bionic harvester. [ABSTRACT FROM AUTHOR]

Published
2022
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148. Uncovering the Role of Crystal Phase in Determining Nonvolatile Flash Memory Device Performance Fabricated from MoTe2-Based 2D van der Waals Heterostructures

Author

Xia, Yunpeng, Zha, Jiajia, Huang, Haoxin, Wang, Huide, Yang, Peng, Zheng, Long, Zhang, Zhuomin, Yang, Zhengbao, Chen, Ye, Chan, Hau Ping, Ho, Johnny C., and Tan, Chaoliang

Abstract

Although the crystal phase of two-dimensional (2D) transition metal dichalcogenides (TMDs) has been proven to play an essential role in fabricating high-performance electronic devices in the past decade, its effect on the performance of 2D material-based flash memory devices still remains unclear. Here, we report the exploration of the effect of MoTe2in different phases as the charge-trapping layer on the performance of 2D van der Waals (vdW) heterostructure-based flash memory devices, where a metallic 1T′-MoTe2or semiconducting 2H-MoTe2nanoflake is used as the floating gate. By conducting comprehensive measurements on the two kinds of vdW heterostructure-based devices, the memory device based on MoS2/h-BN/1T′-MoTe2presents much better performance, including a larger memory window, faster switching speed (100 ns), and higher extinction ratio (107), than that of the device based on the MoS2/h-BN/2H-MoTe2heterostructure. Moreover, the device based on the MoS2/h-BN/1T′-MoTe2heterostructure also shows a long cycle (>1200 cycles) and retention (>3000 s) stability. Our study clearly demonstrates that the crystal phase of 2D TMDs has a significant impact on the performance of nonvolatile flash memory devices based on 2D vdW heterostructures, which paves the way for the fabrication of future high-performance memory devices based on 2D materials.

Published
2023
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150. Growth of Tellurium Nanobelts on h-BN for p-type Transistors with Ultrahigh Hole Mobility

Author

Yang, Peng, Zha, Jiajia, Gao, Guoyun, Zheng, Long, Huang, Haoxin, Xia, Yunpeng, Xu, Songcen, Xiong, Tengfei, Zhang, Zhuomin, Yang, Zhengbao, Chen, Ye, Ki, Dong-Keun, Liou, Juin J., Liao, Wugang, and Tan, Chaoliang

Abstract

The growth of high-quality single-crystalline Te nanobelts is reported by introducing atomically flat hexagonal boron nitride (h-BN) nanoflakes into the chemical vapor deposition system as the growth substrate.The field-effect transistor based on Te grown on h-BN exhibits an ultrahigh hole mobility up to 1370 cm2V−1s−1at room temperature.

Published
2022
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