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Decoupling Li⁺ conductivity and mechanical stability in a thermally reversible concentrated sulfone-based gel electrolyte for lithium metal batteries

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JOURNAL OF MATERIALS CHEMISTRY A 2024年第33期12卷 21912-21922页

作者： Jiang, Xueao Chen, Jiayin Zeng, Junfeng Liu, Weijian Wu, Xuansheng Lv, Yang Liu, Fangyan Zhang, Ce Li, Zhiyong Wang, Xiwen Zhang, Shiguo Hunan Univ Coll Mat Sci & Engn State Key Lab Adv Design & Mfg Technol Vehicle Changsha 410082 Peoples R China City Univ Hong Kong Dept Phys Hong Kong 999077 Peoples R China China Acad Space Technol Nanophoton & Optoelect Res Ctr Qian Xuesen Lab Space Technol Beijing 100094 Peoples R China Henan Normal Univ Sch Chem & Chem Engn Xinxiang 453007 Henan Peoples R China

Increasing the liquid content has been recognized as an effective strategy to enhance the Li+ conductivity and electrode compatibility of gel electrolytes for lithium-metal batteries (LMBs). However, a low gelator content reduces the mechanical strength of gels. Herein, a mechanically stable gel electrolyte comprising 7 wt% methylcellulose (MC), 3 wt% 12-hydroxyoctadecanoic acid (12-HOA), and 90 wt% concentrated sulfone electrolyte (CSE) was developed. Because of its high electrolyte uptake, the MC/12-HOA gel electrolyte exhibits an ionic conductivity of 0.25 mS cm(-1), which is similar to that of the neat CSE, and a Li+ transference number of 0.57, which is even higher than that of the CSE. Abundant ether groups on MC and hydroxyl groups on 12-HOA can strongly immobilize TFSI-via a hydrogen bond, endowing the MC/12-HOA gel with an elastic modulus of 10 MPa enough to form an 80 mu m - thick self-supporting film and suppress Li dendrite growth. Additionally, a reversible gel-sol transition occurs in the MC/12-HOA gel at 329-331 K, which can be utilized to promote electrode wetting and seal the damages of electrolytes. As a result, the MC/12-HOA gel electrolyte displays reliable safety, practical flexibility, and suitable electrochemical performance in both the Li & Vert;LiFePO(4 )and Li & Vert;LiNi0.8Co0.1Mn0.1O2 cells, suggesting the great promise of the MC/12-HOA scaffold in gel electrolytes with different solvents for a wide range of applications in flexible devices.

关键词： Lithium compounds

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Recent Advances in Laser Manufacturing: Multifunctional Integrative Sensing Systems for Human Health and Gas Monitoring

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advanced FUNCTIONAL MATERIALS 2024年第45期34卷

作者： Huang, Yangyi Yang, Rongliang Li, Mitch Guijun Hong Kong Univ Sci & Technol Ctr Smart Mfg Div Integrat Syst & Design Kowloon Clear Water Bay Hong Kong 999077 Peoples R China Chinese Natl Engn Res Ctr Tissue Restorat & Recons Hong Kong Branch Kowloon Clear Water Bay Hong Kong 999077 Peoples R China

Since its first application in the 1950s, the laser has become an indispensable tool in scientific research and manufacturing. Laser manufacturing includes traditional methods such as cutting and engraving and emerging methods such as laser-induced surface modification, laser-induced materials transfer, and laser ablation synthesis. Laser manufacturing is widely applied in the fabrication of multifunctional sensing systems. Compared with other manufacturing methods such as lithography, vacuum deposition, and etching processes, laser manufacturing technology has several advantages, including maskless patterning, high precision, non-contact processing, minimum heat affected zone, high throughput, ability to work with multiple materials, and ease of automation and integration. Here, this review aims to present a comprehensive analysis of the applications of laser manufacturing in various components of health and gas monitoring systems. Emphasis is placed on the application of laser manufacturing in various components of biosensors, including microchannels, sensing circuits, and working electrodes. Subsequently, laser manufacturing of physical and gas sensors is introduced. Meanwhile, traditional laser manufacturing methods, laser surface modification, laser-induced material transfer, and laser ablation synthesis are introduced. Finally, the challenges and prospects of laser manufacturing in sensing systems are discussed.

关键词： biosensors gas sensors laser ablation synthesis laser manufacturing laser surface modification laser-induced materials transfer physical sensors

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Ionogel electrolyte based on porous graphitic C_(3)N_(4)nanosheets for room temperature to 150℃quasi-solid-state lithium batteries

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Journal of Energy Chemistry 2025年第5期104卷 494-504页

作者： Zhaoen Liu Xueao Jiang Jiayin Chen Weijian Liu Long Zhao Yang Lv Zhiyong Li Yan Zhang Xiwen Wang Shiguo Zhang College of Energy Engineering Huanghuai UniversityZhumadian 463000HenanChina College of Materials Science and Engineering State Key Laboratory of Advanced Design and Manufacturing Technology for VehicleHunan UniversityChangsha 410082HunanChina School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007HenanChina

Ionogels,generally formed by immobilizing ionic liquids(ILs)with polymer gelators,hold considerable promise as quasi-solid-state electrolytes(QSSEs)for lithium metal batteries(LMBs)due to their high safety and electrode ***,their practical use in high-temperature LMBs suffers from the softened polymer chains of gelator at high temperatures,leading to liquid leakage and severe growth of Li ***,a novel inorganic ionogel(PCNIL)combining lithium salt-containing IL with porous graphitic carbon nitride nanosheets(PCN)is developed through direct physical *** exhibits a superior ionic conductivity(0.75 mS cm^(-1))at room temperature similar to that of neat IL electrolyte(LiIL)and a Li^(+)transference number(0.56)greatly higher than that of Li-IL(0.20).Furthermore,PCNIL maintains a temperature-independent shear storage modulus of up to 5 MPa from room temperature to 150℃.Consequently,the Li|PCNIL|Li symmetrical cell demonstrates extended reversible lithium plating/stripping over 1200 h without dendritic *** robust mechanical strength,excellent thermal stability,and electrochemical stability of PCNIL allow Li|PCNIL|LiFePO_(4)cells to operate stably in a wide temperature range of 25–150℃.

关键词： Ionogels Graphitic carbon nitride Quasi-solid-state electrolytes High temperature Lithium metal batteries

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Seeing Through Muddy Water: Laser-Induced Graphene for Portable Tomography Imaging

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advanced SCIENCE 2024年第35期11卷 e2406905页

作者： Zhong, Haosong Lu, Xupeng Yang, Rongliang Pan, Yexin Lin, Jing Kim, Minseong Chen, Siyu Li, Mitch Guijun Hong Kong Univ Sci & Technol Ctr Smart Mfg Div Integrat Syst & Design Kowloon Clear Water Bay Hong Kong Peoples R China

Due to its outstanding physical and chemical properties, graphene synthesized by laser scribing on polyimide (PI) offers excellent opportunities for photothermal applications, antiviral and antibacterial surfaces, and electrochemical storage and sensing. However, the utilization of such graphene for imaging is yet to be explored. Herein, using chemically durable and electrically conductive laser-induced graphene (LIG) for tomography imaging in aqueous suspensions is proposed. These graphene electrodes are designed as impedance imaging units for four-terminal electrical measurements. Using the real-time portable imaging prototypes, the conductive and dielectric objects can be seen in clear and muddy water with equivalent impedance modeling. This low-cost graphene tomography measurement system offers significant advantages over traditional visual cameras, in which the suspended muddy particles hinder the imaging resolution. This research shows the potential of applying graphene nanomaterials in emerging marine technologies, such as underwater robotics and automatic fisheries. Electrical Tomography imaging with laser-induced graphene electrodes as portable electrode arrays to see through nonvisible objects in muddy water. The laser-induced graphene enables the high accuracy of the spatial distribution of electrodes and high durability in a salty solution, with high potential to be used in salty aqueous conditions, such as undersea robotics imaging applications. image

关键词： electrical impedance tomography flexible electronics laser-induced graphene resistance sensing wearable devices

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OARNet: Object-Attribute-Relation Network for Predicting Soccer Events

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IEEE TRANSACTIONS ON MULTIMEDIA 2024年 26卷 9216-9227页

作者： Li, Mingzhe Duan, Yiping Tao, Xiaoming Chen, Changwen Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China SUNY Buffalo Comp Sci & Engn Buffalo NY 14260 USA

Event prediction involves analyzing and forecasting events that occur at a specific time and location to inform decision-making and take the next actions. Current event prediction approaches primarily employ deep learning methods to analyze regular patterns from large amounts of historical data. However, predicting adversarial soccer events remains a significant challenge due to strong antagonism and complex relationships between players. With this consideration, we propose an object-attribute-relation (OAR) network for predicting soccer events using multimodal data, including spatiotemporal trajectory data and video data. The proposed scheme aims to enhance prediction performance by transforming multimodal data into an OAR space that integrates global and local relationships (adversarial information and multi-objective information). In particular, the scheme consists mainly of a relation module, an object attribute module, and a graph prediction module. We first use ConvLSTM to extract the visual features of players from video data and use LSTM to extract the movement features of players from spatiotemporal data. Additionally, we apply a multihead GRU attention mechanism to calculate the relation weights. These three components are then combined into an OAR graph of a clip in a soccer game. Finally, an OAR GNN is designed to determine the influence of different objects and predict events. The entire process constitutes an end-to-end event prediction learning framework. Extensive experimental results on the two challenging datasets, namely, soccER and SkillCorner, verify the effectiveness of the proposed framework.

关键词： Object-attribute-relation (OAR) model adversarial event prediction multimodal data graph neural network Object-attribute-relation (OAR) model adversarial event prediction multimodal data graph neural network

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Portable Flexible Spherical Origami Joule-Heaters with Aerogel

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advanced MATERIALS INTERFACES 2025年第5期12卷

作者： Chan, Yee Him Timothy Zhong, Haosong Xu, Yang Lin, Jing Chen, Siyu Yang, Rongliang Li, Mitch Guijun Hong Kong Univ Sci & Technol Ctr Smart Mfg Div Integrat Syst & Design Kowloon Clear Water Bay Hong Kong 999077 Peoples R China Hong Kong Univ Sci & Technol State Key Lab Adv Displays & Optoelect Technol Kowloon Clear Water Bay Hong Kong 999077 Peoples R China

Trending portable smart devices are providing great convenience to the daily life. Thermal conductivity is efficient for contact heat transfer. Unfortunately, existing rigid surfaces can hardly heat objects in arbitrary shapes. Herein, a flexible origami-structure heater fabricated by scalable laser manufacturing with temperature feedback control is proposed. The thin film origami heater is designed as a pair of semispherical origami patterns, which can conform to the curved surface of food samples more effectively. Therefore, the heat conducting area is increased to generate a fast and even heating profile to the surface of the food samples. The outer aerogel provides high thermal insulation to prevent heat dissipation in the environment. As proof of concept, the heating device can cook quail eggs within 3 minutes at a constant temperature of 100 degrees C. The power consumption of this heater is as low as 18 W, which standard portable chargers can power. This work significantly promotes the usability of portable heaters for cooking spherical objects, providing more conveniences during outdoor hiking and even in outer space where water-boiling is impossible without atmosphere and gravity. Combining smart feedback temperature control and lightweight aerogel insulation, a semispherical bilayer polyimide copper sandwich structure BiPI:Cu thin film origami heater is designed that generates a fast and even heating profile on food samples. The thin film heater fabricated by laser irradiation with a high degree of freedom in design can provide a portable and power-efficient solution for more convenient cooking. image

关键词： aerogel flexible portable heaters laser fabrication

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Effect of NaF Addition on the Properties of TC4 Titanium Alloy Micro-Arc Oxidized Coating

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TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS 2025年第6期78卷 1-9页

作者： Chen, Xiaowen Luo, Bin Yang, Junwei Luo, Han Tang, Song Xie, Wanlin Zhang, Defen Southwest Petr Univ Sch New Energy & Mat Chengdu 610500 Sichuan Peoples R China

This study explores the effects of NaF concentrations on the microstructural and mechanical properties of oxide films on TC4 titanium alloy via microarc oxidation (MAO). Results indicate that NaF significantly enhances coating growth, uniformity, and thickness, while also improving surface smoothness and reducing porosity within an optimal concentration range. Mechanical properties, such as hardness and adhesion, initially improve but decline at higher NaF levels, suggesting a critical threshold. Additionally, NaF enhances corrosion resistance by promoting a denser, chemically stable oxide layer. However, excessive NaF leads to structural inhomogeneity and increased porosity, negatively impacting coating densification and corrosion resistance. This research underscores NaF's dual role in optimizing MAO coatings on titanium alloys, emphasizing the need for a balanced concentration to achieve optimal mechanical and protective properties.

关键词： Titanium alloy Micro-arc oxidation NaF Ceramic coating Corrosion resistance

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Mechanically Controlled Enzymatic Polymerization and Remodeling

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ACS MACRO LETTERS 2024年第4期13卷 401-406页

作者： Yang, Lei Guo, Xinyu Yang, Yiyan Duan, Gaigai Chen, Kai Wang, Jian Li, Yiwen Wang, Zhao Sichuan Univ Coll Polymer Sci & Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China Nanjing Forestry Univ Coll Mat Sci & Engn Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo Int Innovat Ctr Forest Chem & Mat Nanjing 210037 Peoples R China Soochow Univ State & Local Joint Engn Lab Novel Funct Polymer M Jiangsu Key Lab Adv Funct Polymer Design & Applica Coll Chem Chem Engn & Mat SciSuzhou Key Lab Macro Suzhou 215123 Peoples R China

In nature, proteins possess the remarkable ability to sense and respond to mechanical forces, thereby triggering various biological events, such as bone remodeling and muscle regeneration. However, in synthetic systems, harnessing the mechanical force to induce material growth still remains a challenge. In this study, we aimed to utilize low-frequency ultrasound (US) to activate horseradish peroxidase (HRP) and catalyze free radical polymerization. Our findings demonstrate the efficacy of this mechano-enzymatic chemistry in rapidly remodeling the properties of materials through cross-linking polymerization and surface coating. The resulting samples exhibited a significant enhancement in tensile strength, elongation, and Young's modulus. Moreover, the hydrophobicity of the surface could be completely switched within just 30 min of US treatment. This work presents a novel approach for incorporating mechanical sensing and rapid remodeling capabilities into materials.

关键词： Coating materials Materials Monomers Polymerization Radical polymerization

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Study on pull-out test of steel and semi-grouting sleeve connection after high temperature

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STRUCTURAL CONCRETE 2025年第2期26卷 1176-1189页

作者： Ma, Jinfeng Zhu, Jianing Guo, Dongdong Xian Univ Architecture & Technol Sch Civil Engn Xian 710055 Peoples R China Xian Univ Architecture & Technol Sch Civil Engn Xian Peoples R China

This paper conducted a study on the mechanical properties of steel and semi-grouting sleeve connections after high temperatures through pull-out tests. The primary parameters investigated in the experimental study included the anchorage length and temperature. The test results indicated that the bearing capacity of the steel and semi-grouting sleeve connection hardly changes with the increase of temperature after being subjected to temperatures of 400 degrees C and lower. After 600 degrees C and higher, the bearing capacity of the steel and semi-grouting sleeve connector decreased significantly, and the steel bar breaking occurred when the anchorage length was 145 mm, while the bond failure occurred when the anchorage length was smaller than 145 mm, which indicated that the bearing capacity of the specimen can be significantly improved by increasing the anchorage length in higher temperature condition. Finally, the calculation formula of the ultimate bearing capacity of steel and semi-grouting sleeve connection after high temperature was put forward, and the proposed formula was proved to be accurate and feasible by comparing with the test results, which provided a reference for the relevant engineering design.

关键词： bond failure high temperature semi-grouting sleeve ultimate bearing capacity

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Unveiling the underlying mechanism of ultrasonic vibration assisted machining: Tip-based single asperity nanoscratching experiments and insights from molecular dynamics simulations

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JOURNAL OF MANUFACTURING PROCESSES 2025年 140卷 78-90页

作者： Wu, Hanqiang Zhang, Shibo Ye, Ximin Guo, Jian Sun, Linhe Xiao, Chen Wu, Yongbo Southern Univ Sci & Technol Dept Mech & Energy Engn Shenzhen 518055 Peoples R China Univ South China Sch Mech Engn Hengyang 421001 Peoples R China Hong Kong Polytech Univ State Key Lab Ultraprecis Machining Technol Hong Kong Peoples R China Southwest Jiaotong Univ Res Inst Frontier Sci Chengdu 610031 Peoples R China Shenzhen Engn Res Ctr Semicond Specif Equipment Shenzhen 518055 Peoples R China

To elucidate the underlying material removal mechanism in ultrasonic vibration-assisted manufacturing, ultrasonic vibration-assisted singe asperity nanoscratching (UVANS) was performed on a single crystal 4H-SiC using a diamond tip with a nanometer-scale curvature radius, integrated with an atomic force macroscope and an ultrasonic vibration platform. The singe asperity experimental results indicated that ultrasonic vibration significantly increases the removal rate while reducing the friction force compared to conventional nanoscratching (CNS) under the same loading conditions. Through carefully designed equivalent experiments, interfacial contact dynamics analysis, and molecular dynamics simulations, it was revealed that the improvement in material removal efficiency by UVANS is primarily contributed to increased contact frequency/velocity, improved processing energy, and intensified frictional flash heating. High-resolution transmission electron microscopy was employed to characterize the atomic structures beneath the machined surface for both CNS and UVANS cases, revealing that introducing ultrasonic vibration at the processing interface effectively mitigates surface and subsurface damage and leads to improved surface quality. The synergistic effects of ultra-high speed/ultra-short contact time, significant reduction in frictional force/contact area at the processing interface, along with a more homogeneous stress distribution in the contact micro-regions, collectively lead to substantial enhancements in both surface and subsurface quality in UVANS case. This study not only provides valuable insights for optimizing ultrasonic vibration-assisted tip-based nanofabrication but also has implications for improving ultrasonicassisted ultra-precision surface manufacturing.

关键词： Tip-based nanoscratching Ultrasonic vibration-assisted nanoscratching Contact dynamics Machining mechanism Molecular dynamics simulation

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