Review
Engineering, Mechanical
Huan Liu, Boming Yang, Chong Wang, Yishu Han, Dameng Liu
Summary: Friction energy dissipation has a significant impact on global energy consumption and economic losses. Understanding the mechanism of friction energy dissipation and finding ways to reduce it are of great importance.
Article
Physics, Multidisciplinary
Xiang Gao, Michael Urbakh, Oded Hod
Summary: A new frictional mechanism based on collective stick-slip motion of moire superstructures across polycrystalline two-dimensional material interfaces is predicted. This phenomenon is expected to occur in various large-scale layered material interfaces, such as h-BN/graphene.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Yue Ying, Zhuo-Zhi Zhang, Joel Moser, Zi-Jia Su, Xiang-Xiang Song, Guo-Ping Guo
Summary: This study investigates the dynamics of nanomechanical resonators with unconventional boundary conditions by observing the reversible sliding motion of the resonator during vibration. The researchers found that the resonant frequency of the vibrations forms a loop as a tuning gate voltage is cycled, indicating a delayed frequency response and richer dynamics compared to resonators with fixed clamping points. These findings offer opportunities for studying friction at the nanoscale through resonant frequency measurements.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Shuai Shi, Dan Guo, Jianbin Luo
Summary: The rapid development of industry has led to increasing energy consumption and resource scarcity, highlighting the need for more energy-efficient technologies like superlubricity. This study proposes a method for controlling superlubricity at the atomic-scale using vibrational excitation (VIS), which can easily and steadily achieve superlubricity in motion systems. Experimental and simulated explorations demonstrate the practical approach of reducing energy dissipation and achieving superlubricity at the atomic-scale.
Article
Multidisciplinary Sciences
Yan Sun, Shuting Xu, Zheqi Xu, Jiamin Tian, Mengmeng Bai, Zhiying Qi, Yue Niu, Hein Htet Aung, Xiaolu Xiong, Junfeng Han, Cuicui Lu, Jianbo Yin, Sheng Wang, Qing Chen, Reshef Tenne, Alla Zak, Yao Guo
Summary: This study presents a nano-electro-mechanical-opto system embedded in multiwall tungsten disulfide nanotubes, which exhibits a unique form of in-plane van der Waals sliding ferroelectricity due to the combination of superlubricity and piezoelectricity. The multiwall tungsten disulfide nanotubes can be used as photovoltaic random-access memory, enabling programmable photovoltaic effect. Additionally, a complete artificial vision system that performs detection, processing, memorizing, and powering functions is integrated into the nanotube devices, allowing for self-driven image recognition.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Weidong Yan, Wengen Ouyang, Ze Liu
Summary: Structural superlubricity based on twisted layered materials has attracted significant research interest. Molecular dynamics simulations reveal a strong correlation between the size scaling of friction and Moire '-level oscillations in circular twisted bilayer graphene (tBLG). By proposing a theoretical formula and deriving an analytic expression, we successfully explain the observed abnormal scaling and provide a rational explanation for the measured scattered power scaling law in various experiments. Additionally, we demonstrate that the origin of the scaling law is related to the Moire ' boundary, highlighting its importance in the thermodynamic models of layered materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Yun Dong, Weibin Hui, Zhiyuan Rui, Yusong Ding, Fangming Lian, Yi Tao
Summary: This study reveals the phonon mechanism of angle-dependent superlubricity between black phosphorus layers based on molecular dynamics simulations and quantum theories. Friction exhibits 180° periodicity with the highest friction at 0° and 180° and lowest at 90°. Thermal excitation reduces friction at 0° due to thermal lubrication, while high temperature increases friction at 90° due to thermal collision. Phonon spectra show that energy dissipation channels can be formed at the interface with 0°, enhancing dissipation efficiency, whereas these channels are destroyed at 90°, hindering frictional dissipation.
Article
Chemistry, Physical
Wei Cao, Oded Hod, Michael Urbakh
Summary: Inspired by the fascinating electronic properties of twisted transition metal dichalcogenides, this study extends the registry index approach to quantify the interlayer commensurability of homogeneous and heterogeneous interfaces of MoS2, WS2, MoSe2, and WSe2. The developed geometric measure provides quantitative information about their sliding energy landscape with mechanical and tribological implications. Furthermore, the registry index is highly suitable for characterizing surface reconstruction in twisted transition metal dichalcogenide interfaces, which determines their intricate electronic and ferroelectric properties.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Paolo F. Ferrari, SunPhil Kim, Arend M. van der Zande
Summary: The study found that different types of graphene membrane resonators have different dissipation characteristics, with monolayer graphene having the highest average quality factor. Dissipation in graphene membranes is mainly affected by changes in stiffness and additional dissipation from interlayer friction. This has important implications for nanoelectromechanical systems (NEMS) based on two-dimensional heterostructures.
Article
Engineering, Mechanical
Shuang Yi, Jinjin Li, Yanfei Liu, Xiangyu Ge, Jie Zhang, Jianbin Luo
Summary: In this study, a robust macroscale superlubricity state was achieved by introducing Ti3C2Tx MXene nanoflakes in glycerol at Si3N4/sapphire interfaces, resulting in a significant reduction of friction coefficient and triggering liquid superlubricity.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Ehud Haimov, Aidan Chapman, Fernando Bresme, Andrew S. Holmes, Tom Reddyhoff, Michael Urbakh, Alexei A. Kornyshev
Summary: Innovative concepts and materials are driving the development of energy harvesters for slower motion, particularly for personal wearables or portable small-scale applications, contributing to a sustainable economy. The proposed capacitive rotor device operates based on rotary motion to generate alternating current, with potential applications in various scenarios due to its scalability and power output capabilities. Energy harvesting devices based on micro-electromechanisms (MEMS) show promise for sustainable energy applications, with the theoretical working principle of a low-voltage AC-current generating MEMS-based capacitive rotor device presented for Watts-level power generation from everyday walking.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Mechanical
Shengcong Wu, Zhisen Meng, Xiaoma Tao, Zhao Wang
Summary: The study demonstrates that large deformations in the substrate can lead to a significant decrease in friction between a MoS2 nanoflake and a MoS2 substrate, resulting in superlubricity. This friction reduction is highly anisotropic, with different sliding directions showing variations in coefficient of friction.
Article
Chemistry, Physical
Jing Hua, Marcus Bjorling, Roland Larsson, Yijun Shi
Summary: Superlubricity between steel surfaces lubricated by mixtures of [Cho][Pro] ionic liquid and glycerol aqueous solution has been achieved, even under humidity between 7 and 9% RH. The addition of 3wt% [Cho][Pro] helps to maintain enough water content for a thin water layer at the interface, leading to lower friction. Interestingly, humidity can be used to control the lubrication state between superlubricity and non-superlubricity.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Gongbin Tang, Fenghua Su, Xiaochu Liu, Zhongwei Liang, Tao Zou, Paul K. Chu
Summary: In this study, the dots of gold nanoparticles on black phosphorus have been shown to enhance superlubricity at the Si3N4/MoN interface in PAO6 oil. It is found that the strong hydrogen bonding between oil molecules and the nano-Au, as well as the incommensurate interlayer stacking of BP facilitated by nano-Au, contribute to the superlubricity. This study provides fundamental knowledge about nanoscale frictional behavior and superlubricity mechanisms, and offers a novel concept for designing nanoadditives with superlubricity.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Zaoqi Duan, Zhiyong Wei, Shuyu Huang, Yongkang Wang, Chengdong Sun, Yi Tao, Yun Dong, Juekuan Yang, Yan Zhang, Yajing Kan, Deyu Li, Yunfei Chen
Summary: Frictional energy dissipation involves generation of excess phonons at multiple resonant frequencies due to nonlinear interactions between a sliding tip and a substrate, leading to multiple peaks in the friction force as the tip sliding velocity ramps up. These observations reveal previously unrecognized energy dissipation channels associated with tip vibration.
Article
Chemistry, Physical
Sirinya Ukasi, Paritta Jutapukti, Chiranicha Ninthub, Nattapong Pinpru, Phakkhananan Pakawanit, Wanwilai Vittayakorn, Satana Pongampai, Naratip Vittayakorn, Thitirat Charoonsuk
Summary: This study explores the enhancement of electrical output of flexible hybrid piezoelectric-triboelectric nanogenerators by incorporating gamma-glycine into fully organic composites. The research demonstrates the importance of optimized concentrations of gamma-glycine and chitosan in achieving superior performance. The study identifies the critical content of gamma-glycine that leads to the highest output signal, and provides theoretical explanations for this observation.
Article
Chemistry, Physical
Yoonsang Ra, Yu-seop Kim, Seonmo Yang, Namgyu Kang, Gyuwon Oh, Chungyeon Cho, Sangmin Lee, Dongwhi Choi
Summary: In this study, a portable energy harvester (STEP) was proposed to drive various functional LEDs using biomechanical energy. The roles and functionalities of a triboelectric nanogenerator (TENG) and electromagnetic generator (EMG) in the hybrid energy harvester were experimentally demonstrated, and the necessity of hybridization for LED-involved devices was described. The STEP showed promising potential as an effective energy supply strategy for various functional LEDs in related industries.
Article
Chemistry, Physical
Dae Sol Kong, Kyung Hoon Kim, Ying Chieh Hu, Jong Hun Kim, Inseo Kim, Jeongwan Lee, Joonhyuk Lee, Won Hyuk Shon, Hanjin Yoo, Chul-Un Ro, Seungsu Lee, Hyoungjeen Jeen, Minbaek Lee, Minseok Choi, Jong Hoon Jung
Summary: With the rapid development of the Internet of Things and artificial intelligence, smart home has emerged to fulfill the security, convenience, and energy-saving issues of modern life. A flexoelectric mica crystal is used to augment the finger touch-driven triboelectric output for operating a wireless and multichannel smart home controller. This work provides important ingredients for enhancing triboelectric output and realizing a convenient, multifunctional, cost-effective, and adaptable smart home control system without batteries.
Article
Chemistry, Physical
Yi Han, Fang Wu, Xiaozhen Du, Zihao Li, Haixiang Chen, Dongxing Guo, Junlei Wang, Hong Yu
Summary: This paper presents a novel type of triboelectric nanogenerator that utilizes wind energy, with a Y-type bluff body to enhance vibration and output power. The application of this generator successfully provides power for a wireless temperature and humidity sensor.
Article
Chemistry, Physical
Wen Zhang, Fangyuan Cheng, Miao Chang, Yue Xu, Yuyu Li, Shixiong Sun, Liang Wang, Leimin Xu, Qing Li, Chun Fang, Meng Wang, Yuhao Lu, Jiantao Han, Yunhui Huang
Summary: This study successfully induced the formation of a uniform and robust CEI by constructing ZrO2 nano-rivets on the surface of LCO, stabilizing the surface of high-voltage LCO and facilitating lithium-ion diffusion.
Article
Chemistry, Physical
Karl P. Olson, Laurence D. Marks
Summary: This paper investigates the role of contacting shapes in triboelectricity and provides scaling rules for designing energy harvesting devices.
Article
Chemistry, Physical
Jong-An Choi, Jingu Jeong, Mingyu Kang, Hee-Jin Ko, Taehoon Kim, Keun Park, Jongbaeg Kim, Soonjae Pyo
Summary: Wind-driven triboelectric nanogenerators (WTENGs) are a promising emerging technology for sustainable wind energy harvesting, offering high output performance, lightweight design, and compact dimensions. This study introduces an innovative WTENG design that leverages a rolling-based mechanism to achieve efficient omnidirectional wind energy harvesting.
Article
Chemistry, Physical
Liwei Dong, Qian Tang, Chaoyang Zhao, Guobiao Hu, Shuai Qu, Zicheng Liu, Yaowen Yang
Summary: This paper proposes a novel hybrid scheme for flag-type nanogenerators (FNGs) that enhances their performance and broadens their operational wind speed ranges by harnessing the synergistic potential of two aerodynamic behaviors. The proposed flag-type triboelectric-piezoelectric hybrid nanogenerator (FTPNG) integrates flapping piezoelectric flags (PEFs) and a fluttering triboelectric flag (TEF). The FTPNG achieves significant power generation and a broad wind speed range, surpassing other FNGs, making it suitable for various self-powered systems and Internet of Things applications.
Review
Chemistry, Physical
Yunmeng Li, Xin Liu, Zewei Ren, Jianjun Luo, Chi Zhang, Changyong (Chase) Cao, Hua Yuan, Yaokun Pang
Summary: The demand for green and eco-friendly materials is growing due to increasing environmental concerns related to traditional petroleum-based products. Marine biomaterials have emerged as a promising alternative, thanks to their abundant availability, biocompatibility, biodegradability, and low toxicity. In this review, we discuss the development and applications of triboelectric nanogenerators (TENGs) based on marine biomaterials. The operational modes, foundational principles, intrinsic qualities, and advantages of marine biomaterials commonly used in TENG designs are highlighted. Approaches to enhance the efficacy of TENGs derived from marine biomaterials are also discussed, along with documented applications from existing literature. Furthermore, the existing challenges and future directions in marine biomaterial-inspired TENGs are explored.
Article
Chemistry, Physical
Matthew P. Wells, Adam J. Lovett, Yizhi Zhang, Zhongxia Shang, Kosova Kreka, Babak Bakhit, Haiyan Wang, Albert Tarancon, Judith L. MacManus-Driscoll
Summary: Reversible solid oxide cells (rSOCs) offer a promising solution to efficient energy conversion, but have been limited in portable power and electrolysis applications due to excessive polarisation resistance of the oxygen electrode at low temperatures. This study demonstrates the growth of symmetric and complete rSOC structures with reduced polarisation resistance by tuning oxygen vacancy through annealing, providing a promising route towards high-performance rSOC devices for portable power applications.
Article
Chemistry, Physical
Kangkang Bao, Minghui Wang, Yue Zheng, Panpan Wang, Liwen Yang, Yang Jin, Hui Wu, Bin Sun
Summary: This study utilizes ethanol as an electrolyte additive to modulate the migration of zinc ions and the surface structure of zinc anodes, resulting in improved capacity retention and cycle life of zinc-based aqueous batteries.
Article
Chemistry, Physical
Haichao Yang, Wensi Cai, Ming Wang, Saif M. H. Qaid, Zhiyuan Xu, Huaxin Wang
Summary: The introduction of sodium alginate (SA) into perovskite solar cells improves the carrier dynamics, stability, and performance by inhibiting nonradiative recombination and retarded charge dynamics.
Article
Chemistry, Physical
Cuirong Zhang, Mingyuan Wei, Zihan Chen, Wansheng Lin, Shifan Yu, Yijing Xu, Chao Wei, Jinwei Zhang, Ziquan Guo, Yuanjin Zheng, Qingliang Liao, Xinqin Liao, Zhong Chen
Summary: Artificial Intelligence of Things (AIoT) aims to establish smart and informative interactions between humans and devices. However, common pixelated sensing arrays in AIoT applications present problems such as hard and brittle devices, complex structures, and low precision. This article introduces an innovative solution called the all-in-one intelligent semitransparent interactive nerve patch (AISI nerve patch), which integrates sensing, recognition, and transmission functionalities into a thin and flexible patch. The AISI nerve patch is semitransparent, allowing for accurate identification without affecting aesthetics, and it can be attached to any curved surface for intelligent and interactive applications. With rapid response time and high precision recognition, it enables the integration of artificial intelligence and achieves high recognition accuracy for further development of AIoT.
Article
Chemistry, Physical
Youcun Bai, Heng Zhang, Huijun Song, Chong Zhu, Lijin Yan, Qin Hu, Chang Ming Li
Summary: A novel stainless-steel supported lattice-mismatched V-S-Se layered compound with high selenium vacancy was synthesized by adjusting the molar ratio of sulfur to selenium. The introduction of selenium vacancies created additional redox peaks of sulfur, providing more mass transport channels and active sites for zinc ions. The specific capacity and cycle stability of the electrode were significantly improved, demonstrating great potential for practical applications and providing insights into the effects of defects on battery performance.
Article
Chemistry, Physical
Yao Xiao, Puxian Xiong, Yakun Le, Zhenjie Lun, Kang Chen, Zhiduo Wang, Peishan Shao, Zhicong Chen, Dongdan Chen, Zhongmin Yang
Summary: This study successfully synthesized a material with multi-stimulus-responsive luminescence and confirmed the internal relationship between luminescence and defects by regulating the distribution and depth of defects. The dynamic process of multi-stimulus-responsive luminescence was validated by experimental and calculation results.
