JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·6194-6204
·
IF 3.9
Yang Li,Dehua Wang,Ye Lu,Hebin Li,Yangmo Liu,Yuankun Li,Mingxiang Li,Zifei Meng,Lixiang Chen,Hanbin Wang,Keqing Ruan,Xiaoxiong Wang
Flexible inorganic functional materials have received extensive attention in recent years due to their unique properties and potential application prospects. Among various flexible materials, ceramic fiber membranes have great application prospects due to their functional original structure. Unlike other materials, such as one-dimensional flexible ice, two-dimensional BaTiO 3 , and three-dimensional α-Ag 2 S, ceramic fiber membranes are high-performance materials with a functional unit structure. In the field of electrospinning, electrospinning technology can effectively control the microstructure of ceramic fibers, allowing for multileveled structure design, such as ordered electrospinning technology and disordered electrospinning technology, which can effectively control the functional primitive structure. However, the mechanical behavior of these structures is still poorly understood. In this groundbreaking study, we investigated the functional original structure of CaTiO 3 :Eu 3+ electrospinning fiber membranes from the bottom-up and explored the effect of grain diameter ratio on mechanical behavior and studied the effect of Eu 3+ ions on the luminescent properties of CaTiO 3 functional fiber membranes. By controlling the electrospinning parameters and avoiding inherent mechanical property differences between the microcrystals, we realized the stress concentration design from the perspective of functional element structure. Our results show that the stress concentration design at the bottom of the multileveled structure significantly affects the overall mechanical behavior. This work proposes a new method to control the mechanical properties of inorganic functional ceramic fiber membranes through functional element structure design and provides the first bottom-ordered regulation method, offering a new dimension for future research in this field.
研究领域:
材料科学
·
力学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinke Zhou,Shengkai Liu,Amna Siddique,Chunying Min,Xiaoyuan Pei,Siqi Liu,Yue Yin,Kun Song,Zhiwei Xu
Carbon fiber/epoxy resin composites are susceptible to stress concentration at the interface due to significant differences in the physical and chemical properties of the fibers and resin, resulting in severe degradation of the composite properties. In this paper, the construction of an interfacial transition layer with controllable thickness was achieved for the first time by in situ growth of amino-functionalized metal–organic framework materials with different particle sizes on the surface of carbon fibers and the stress concentration mitigation effect of the modified composites was investigated. Nanoindentation tests showed that interfacial transition layers with thicknesses of 500, 800, 1100 and 1600 nm were successfully constructed. The maximum improvement in interfacial shear, interlaminar shear and flexural properties of the modified composites were 115.0 %, 18.7 % and 26.7 % respectively, compared to the pure carbon fiber composites. Finite element simulations indicated that the stress concentration of the composites decreased by 16.7 %, 33.3 %, 58.3 % and 66.7 % with increasing the thickness of the interfacial transition layer respectively. The electron micrographs after failure showed that the failure mode of the composites changed from interfacial debonding to cohesive failure (fiber and matrix fracture), and the failure plane moved slightly from the interface to the inside of the epoxy resin, which indicated that the introduction of the interfacial transition layer improved the stress transfer between the fibers and the matrix, thus improving the mechanical properties of the composites. This finding enriched the theory of interfacial design for composites and contributed to the breakthrough improvement of their mechanical properties.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY LETTERS
·
2023
·Vol. 71
·期 4
·1-13
·
IF 3.2
Fu Jingguo,Fan Liyang,He Yuhang,Yu Zhiwei,Ma Dengqing,Yin Huabing,Zhang Hongpeng
The combination of surface dimples and solid lubricant can improve the friction state between moving parts. However, the presence of surface dimples also leads to surface stress concentration, and the influence of these stresses on tribological properties is also worth studying. In this work, solid lubricant mixture polyimide and tungsten disulfide were firstly encapsulated in the dimples on the cylinder liner surface. The influence of surface stress concentration on the anti-friction performance of moving parts was then investigated through surface stress simulation and reciprocating friction and wear experiments. The results indicated that during reciprocating friction movement, surface stress concentration caused by the dimples mainly appeared at their edges. Moreover, as the diameter of the dimples increased, there was a gradual decrease in maximum surface stress on the cylinder liner. However, higher contact pressure and shear stress generated by edge-induced stress concentration could promote tribochemical reactions between Fe matrix and mixed solid lubricants polyimide and tungsten disulfide, resulting in formation of a solid lubrication film as well as iron–carbon and iron–nitrogen compounds that enhanced anti-friction effects.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Zaiping Zou,Jiajun Li,Yingsheng Lai,Yeping Wu,Mao Chen,Xiuli Zhao,Zhongtao Chen
Mechanochromism is a promising tool for damage monitoring in polymeric materials. However, achieving significant mechanochromism in glassy thermosets remains challenging, owing to the low mechanophore activation. Herein, we investigate the effect of local structures around rhodamine (Rh) on the mechanochromism of Rh-based epoxy thermosets. The different microenvironments surrounding Rh lead to different levels of mechanochromic response under compression. We demonstrated that greater structural rigidity around the mechanophore promotes mechanical responsiveness. Specifically, the AFG90-modified Rh, featuring dense phenyl rings and the highest functionality, exhibits optimal local stiffness, generating a stress-concentration that triggers significant activation. These findings reveal that the local details of how a mechanophore is connected to a surrounding glassy matrix can influence the extent of mechanochemical activation. Tuning of the local network structure might provide an additional strategy for developing desired mechanochromic thermosets without compromising mechanical/thermal properties and guidelines for the design of polymer networks.
研究领域:
高分子科学
·
材料科学
·
机械物理学
·
化力耦合
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
·
2024
·
IF 5
Xiaochun Jiang,Qingqing Chen,Meng Yang,Xi Chen,Tongqing Lu,Tiejun Wang
The adhesion of soft materials often fails due to stress concentration at the interface. Structural design offers an effective approach to disperse stress at the interface and enhance adhesion properties. Herein, we introduce the concept of discretized stress dispersion to achieve ultrastrong adhesion of soft materials. This involves incorporating discrete structures at the adhesion interface, with each unit structure designed to efficiently disperse stress. We implement this concept by introducing periodic strategic cuts into the adhesive, enabling it to deform into discrete mushroom-shaped structures under peel forces. Utilizing fracture mechanics theory, we demonstrate that such structural design can significantly improve adhesion strength compared to adhesives without structural design. Through 3D printing, we fabricate adhesive samples with strategic cuts, achieving a peak peel force of 3479 N/m, over 100-fold higher than adhesives without cuts (25 N/m). We analyzed stress dispersion of each unit structure through experiments of with different geometric parameters and analyze collaborative effects of multiple structures with theoretical model. Finite element analysis of the peel process highlights the critical role of cohesive zone influenced by geometric parameters, which determines the peak peel force. This concept of discretized stress dispersion advances the development of soft materials with ultrastrong adhesion.
研究领域:
材料科学
·
机械工程
·
粘附技术
✓ 已验证
产品关联
DOI
高影响因子
EcoMat
·
2023
·Vol. 5
·期 4
·e12327
·
IF 14.6
Zhan Wu,Wenkui Zhang,Yang Xia,Hui Huang,Yongping Gan,Xinping He,Xinhui Xia,Jun Zhang
Sulfide solid state electrolyte (SSE) possesses high ionic conductivity and great processability but suffers from narrow electrochemical window. Conversion sulfide cathode FeS 2 has higher specific capacity and moderate redox potential, making it appropriate toward sulfide SSE. However, the complex reaction pathway and capacity fading mechanism in FeS 2 are rarely studied, especially in all-solid-state lithium battery (ASSLB). Herein, argyrodite sulfide SSE is paired with FeS 2 to investigate the electrochemical reaction pathways and the capacity fade mechanism. Instead of single conversion reaction, an anionic redox driven reaction of FeS 2 is revealed. The oxidization of Li 2 S vanishes and large quantity of inactive Li 2 S accumulates to cause the interfacial deterioration, along with the stress concentration during cycling, which leads to the rapid capacity fade of FeS 2 . Finally, a simple strategy of slurry-coated composite electrode with highly conductive network is proposed to direct the uniform deposition of Li 2 S and alleviate the stress concentration.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Yu Zhou,Hanwei Zhang,Yinglei Wang,Tao Wan,Peiyuan Guan,Xindong Zhou,Xuri Wang,Yichang Chen,Hancheng Shi,Aichun Dou,Mingru Su,Ruiqiang Guo,Yunjian Liu,Liming Dai,Dewei Chu
Nickel-rich LiNi0.8Co0.15Al0.015O2 (NCA) with excellent energy density is considered one of the most promising cathodes for lithium-ion batteries. Nevertheless, the stress concentration caused by Li+/Ni2+ mixing and oxygen vacancies leads to the structural collapse and obvious capacity degradation of NCA. Herein, a facile codoping of anion (F–)-cation (Mg2+) strategy is proposed to address these problems. Benefiting from the synergistic effect of F– and Mg2+, the codoped material exhibits alleviated Li+/Ni2+ mixing and demonstrates enhanced electrochemical performance at high voltage (≥4.5 V), outperformed the pristine and F–/Mg2+ single-doped counterparts. Combined experimental and theoretical studies reveal that Mg2+ and F– codoping decreases the Li+ diffusion energy barrier and enhances the Li+ transport kinetics. In particular, the codoping synergistically suppresses the Li+/Ni2+ mixing and lattice oxygen escape, and alleviates the stress–strain accumulation, thereby inhibiting crack propagation and improving the electrochemical performance of the NCA. As a consequence, the designed Li0.99Mg0.01Ni0.8Co0.15Al0.05O0.98F0.02 (Mg1+F2) demonstrates a much higher capacity retention of 82.65% than NCA (55.69%) even after 200 cycles at 2.8–4.5 V under 1 C. Furthermore, the capacity retention rate of the Mg1+F2||graphite pouch cell after 500 cycles is 89.6% compared to that of the NCA (only 79.4%).
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Zhuqing Zhang,Haihong Wu,Lin Jiang,Zhanhu Guo,Tie Geng
Introducing periodic structures into GFRP is a key approach to integrating structural and microwave-absorbing functions. However, conventional metallic periodic structures often cause stress concentration problems. In this study, periodic CIP/CF grid structures were embedded into GFRP laminates, which were made from CIP-modified continuous CF tapes. This design uses epoxy resin for integral molding of continuous GFs and CFs, which can effectively prevent interfacial stress concentration and maintain the excellent mechanical properties of GFRP laminates. Critical geometric parameters, including the CIP/CF grid bandwidth and GFRP layer thickness, were optimized using the genetic algorithm in MATLAB. The optimized structure was then modeled, and its microwave absorption performance was verified using HFSS software. Experimental results confirmed the HFSS simulation data, showing effective absorption in the 6.3–8.8 and 10.3–18 GHz frequency bands, with a peak absorption of −33.8 dB. Additionally, the microwave-absorbing laminate with periodic CIP/CF grid retained the inherent high specific strength of GFRP and exhibited improved flexural strength, reaching 470 MPa (a 7% improvement over neat GFRP). The combined electromagnetic properties of GFRP, CF, and CIP, along with the synergistic effect of the CIP/CF grids, enabled the ultimate laminate to achieve broadband microwave absorption performance.
研究领域:
微波工程
·
复合材料
·
电磁吸收
·
结构优化
·
纤维增强聚合物
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Ye Tian,Feng Hao
Flexible solid-state batteries are inevitably subjected to complex dynamic mechanical loads in service. The core gel electrolyte is highly sensitive to mechanical stress, resulting in fatigue effect triggered by cyclic load, which directly threatens the mechanical integrity and electrochemical reliability of batteries. Herein, the quantitative analysis of macro-microstructure evolution and dynamic response of gel electrolyte under bending fatigue load is realized by using digital image correlation (DIC) technology and scanning electron microscope (SEM). The results indicate that the prepared gel electrolyte has good mechanical and electrochemical properties, showing strong cyclic dependence and angular correlation. As the bending cycle number and bending angle increase, the electrolyte surface undergoes periodic buckling deformation, accompanied by increased heterogeneity of strain filed. Moreover, the fatigue resistance of the electrolyte is significantly negatively correlated with the bending angle. For multiple cyclic loads and large bending angles, the electrolyte undergoes stress concentration, which leads to defect nucleation and crack propagation, and ultimately attenuates the electrochemical performance. This study reveals the mechano-electrochemical coupling mechanism of gel electrolyte, and provides guidance for the optimization of electrolyte anti-fatigue performance and the structural design of flexible solid-state batteries.
研究领域:
材料科学
·
机械工程
·
电化学
·
固体物理
·
疲劳分析
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 36
·2103989
·
IF 18.808
Xiao Wang,Yuanyuan Zhang,Yun Zhao,Guang Li,Jianhua Yan,Jianyong Yu,Bin Ding
Inorganic materials assembled with rigid elements such as crystals or graphitized carbon generally show brittleness and hardness. However, it is found that both TiO 2 ceramic crystal nanofibers (NFs) and carbon NFs show superior flexibility, in which the former are surprisingly knottable and the latter exhibit excellent bending-resilience property. The different flexure mechanisms are revealed by fabricating composite NFs of these two constituents and find that the carbon NFs can be recovered to the original states after releasing the external force, while the bending-resilience is weakened and the softness of the composite NFs is enhanced upon increasing the TiO 2 content. The graphitized carbon can store mechanical deformation energy that enables the NFs with bending-resilience, while both the homogeneous interfaces between TiO 2 crystals and the heterogeneous interfaces between TiO 2 and carbon can alleviate stress concentration, which reduce the flexural modulus of the composite NFs. By filling different contents of elastic carbon into TiO 2 NFs, a series of flexible NFs that exhibit gradient bending-resilience properties are fabricated. This study provides a deeper understanding of the mechanical properties of inorganic materials.
研究领域:
材料科学
·
纳米技术
·
陶瓷学
·
材料力学性能
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Ganguang Yang,Zhaogang Lan,Hangyu Gong,Jiacheng Wen,Bo Pang,Yuqi Qiu,Yue Zhang,Wei Guo,Tianzhao Bu,Bin Xie,Hao Wu
Collecting electrophysiological (EP) signals (e.g., electrocardiogram (ECG), electromyogram (EMG)) during exercises is crucial for feedback of cardiac health and muscle injuries. However, since several interferences exist in the skin interface (e.g., deformation, perspiration, and motion artifacts), commercial rigid electrodes/systems have difficulty in recording high-fidelity EP signals. Here, a wireless Nepenthes -inspired hydrogel (NIH) hybrid system is developed for high-quality EP signal detection by establishing seamless-integrated and rapidly directional sweat-wicking device/skin interfaces during exercises. The adhesive strength of poly(vinyl alcohol)/poly(acrylic acid) (PVA/PAAC)-based double-network hydrogels is significantly increased by more than sixfolds. Nepenthes -inspired microstructures are further fabricated on hydrogels to enhance the directional transport speed of droplets by 4.5 times. Notably, the NIH electrodes can maintain an intimate coupling with the skin during continuous artificial sweat injection while showing the lowest impedance and highest signal-to-noise ratio (>19 dB) of EMG signals under complex conditions (i.e., vibration and perspiration). Finally, the NIH hybrid system is fabricated by decorating silicone joints and hollow structures to avoid stress concentration. This system can record high-quality ECG waveforms and heart rate curves with relative deviations of <2.6% during exercises and rest. This NIH hybrid system represents a promising platform for precise EP signal monitoring in exercising scenarios.
研究领域:
生物医学工程
·
材料科学
·
可穿戴技术
·
电生理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fenglong Li,Zhengyang Kong,Xiaolin Wang,Guyue Wang,Chao Chen,Ying Tian,Zhiyi Lyu,Kyung Jin Lee,Do Hwan Kim,Jung-Yong Lee,Jin Zhu,Wu Bin Ying
Central Sleep Apnea (CSA) is characterized by respiratory pauses during sleep, posing risks like cardiovascular diseases, stroke and sudden death. The challenges in managing it arise from the current monitoring tools, which are often complicated and inaccurate. Furthermore, respiratory pauses leading to decreased blood oxygen can induce profuse sweating, further affecting accuracy. Herein, we have synthesized a bio-based, biocompatible and sweat-resistant polyurethane . By utilizing it as the matrix, we incorporated [BMIM] + [PF 6 ] − to fabricate a markedly sensitive dielectric material, termed i-DFPU. The fluorine groups in i-DFPU contributed to a trap-release effect for migratable ions, while the alkyl side chains provided smooth ion migration channels, endowing i-DFPU with exceptional sensitivity. In combination with a stress concentration layer and serpentine-shaped electrodes, the resultant iontronic skin exhibited a remarkable sensitivity up to 132.2 kPa −1 , operational stability and portability. Consequently, it could accurately monitor various respiratory states in CSA, potentially preventing complications such as sudden death.
研究领域:
材料科学
·
生物医学工程
·
睡眠医学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）