Juan Chen

China University of Petroleum, Beijing

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Liangcai Zeng

Wuhan University of Science and Technology

Tao Zhou

Wuhan University

Yongling Fu

Beihang University

Keying Chen

Xi'an Polytechnic University

Xiaoye Qi

Dalian Polytechnic University

Lin Xu

Southeast University

De‐Yi Wang

IMDEA Materials

Guiyuan Jiang

China University of Petroleum, Beijing

Jie Ren

North University of China

Wenting Guo

Inserm

Cooperative Institutions

Chinese Academy of Sciences

Wuhan University of Science and Technology

Shandong University

Beihang University

North China Electric Power University

Tongji University

Xi'an Jiaotong University

National University of Defense Technology

Tsinghua University

Huazhong University of Science and Technology

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Effects of Heterogeneous Particle Parameters on Micro-EHL Lubrication on Composite Surface in Line Contact

International Journal of Precision Engineering and Manufacturing (2021)

Juan Chen Keying Chen Liangcai Zeng Wenting Guo

Particle (ecology)

10.1007/s12541-021-00588-w

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Citations (1)

Recycling of Lithium Batteries—A Review

Energies (2022)

Xiaowei Duan Wenkun Zhu Zhongkui Ruan Min Xie Juan Chen

With the rapid development of the electric vehicle industry in recent years, the use of lithium batteries is growing rapidly. From 2015 to 2040, the production of lithium-ion batteries for electric vehicles could reach 0.33 to 4 million tons. It is predicted that a total of 21 million end-of-life lithium battery packs will be generated between 2015 and 2040. Spent lithium batteries can cause pollution to the soil and seriously threaten the safety and property of people. They contain valuable metals, such as cobalt and lithium, which are nonrenewable resources, and their recycling and treatment have important economic, strategic, and environmental benefits. Estimations show that the weight of spent electric vehicle lithium-ion batteries will reach 500,000 tons in 2020. Methods for safely and effectively recycling lithium batteries to ensure they provide a boost to economic development have been widely investigated. This paper summarizes the recycling technologies for lithium batteries discussed in recent years, such as pyrometallurgy, acid leaching, solvent extraction, electrochemical methods, chlorination technology, ammoniation technology, and combined recycling, and presents some views on the future research direction of lithium batteries.

Pyrometallurgy

Environmental Pollution

10.3390/en15051611

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Citations (69)

Crack propagation in silicon nitride ceramics under various temperatures and grain boundary toughness

Materials Science and Engineering A (2015)

Sai Wei Lukas Porz Zhipeng Xie Bin Liu Juan Chen

Transgranular fracture

10.1016/j.msea.2015.02.061

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Citations (15)

Involvement of the AMPK Pathways in Muscle Development Disparities across Genders in Muscovy Ducks

International Journal of Molecular Sciences (2024)

Wanxin Zhao Yulin He Ziyuan Du Xuanci Yu Juan Chen

The differences in muscle development potential between male and female ducks lead to variations in body weight, significantly affecting the growth of the Muscovy duck meat industry. The aim of this study is to explore the regulatory mechanisms for the muscle development differences between genders. Muscovy ducks of both sexes were selected for measurements of body weight, growth traits, hormone levels, and muscle gene expression. The results show that male ducks compared to females had greater weight and growth traits (p < 0.05). Compared to male ducks, the level of serum testosterone in female ducks was decreased, and the estradiol levels were increased (p < 0.05). The RNA-seq analysis identified 102 upregulated and 49 downregulated differentially expressed genes. KEGG analysis revealed that among the top 10 differentially enriched pathways, the AMPK signaling pathway is closely related to muscle growth and development. Additionally, the mRNA and protein levels of CD36, CPT1A, LPL, and SREBP1 were increased and the P-AMPK protein level decreased in the female ducks compared to the male ducks (p < 0.05). In conclusion, muscle development potential difference between male and female ducks is regulated by sex hormones. This process is likely mediated through the activation of the AMPK pathway.

10.3390/ijms251810132

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Citations (1)

Comparative Study on the Generation and Characteristics of Debris Induced by Fretting and Sliding

Materials (2022)

Po Zhang Zhaobing Cai Wenjun Yang Juan Chen Shiyuan Luo

Objectives: The aim of the present work was to comparatively investigate the generation and characteristics of fretting and sliding wear debris produced by CuNiAl against 42CrMo4. Methods: Tribological tests were conducted employing a self-developed tribometer. Most experimental conditions were set the same except for the amplitudes and number of cycles. Morphological, chemical, microstructural and dimensional features of the worn area and debris were investigated using optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and a laser particle sizer. Outcomes: Not only wear scar profiles but also the wear debris color, distribution and generated amount under fretting and sliding wear modes were quite different, which can be attributed to the significant difference in wear mechanisms. Particle size analysis indicates that the fretting debris has a smaller size distribution range; the biggest detected fretting and sliding wear debris sizes were 141 μm and 355 μm, respectively. Both fretting and sliding debris are mainly composed of copper and its oxides, but the former shows a higher oxidation degree.

Fretting Wear

Tribometer

Energy-dispersive X-ray spectroscopy

Particle (ecology)

10.3390/ma15124132

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Citations (4)

Study on Mechanical Properties of Composites with Regular Distribution of Single Layer Ellipsoid Particles

IOP Conference Series Materials Science and Engineering (2019)

Keying Chen Liangcai Zeng Yufeng Chai Juan Chen

Abstract The impact of the size distribution of the reinforced particles on the mechanical properties of composite materials is studied, according to the corresponding parameters, the finite element model of the composites on the model of Al based SiC composites is established. With the method of finite element simulation, the surface displacement and stress distribution of particle reinforced composites whose surface is pressed by a line uniformly load is solved, the effects of reinforced particles buried depth, length to diameter ratio, the young’s modulus ratio of matrix and particles, and rotation angle on the mechanical properties of composites are also analyzed The article outlines concrete influences of the structure parameters and spatial distribution parameters of particles which distribute in the composites on the surface displacement and stress distribution of the composites.

Ellipsoid

Particle (ecology)

10.1088/1757-899x/631/2/022034

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Citations (0)

Fundamentals of Unanticipated Efficiency of Gd₂O₃‐based Catalysts in Oxidative Coupling of Methane

Angewandte Chemie International Edition (2024)

Kai Wu Anna Zanina Vita A. Kondratenko Lin Xu Jianshu Li

Abstract Improving the selectivity in the oxidative coupling of methane to ethane/ethylene poses a significant challenge for commercialization. The required improvements are hampered by the uncertainties associated with the reaction mechanism due to its complexity. Herein, we report about 90 % selectivity to the target products at 11 % methane conversion over Gd 2 O 3 ‐based catalysts at 700 °C using N 2 O as the oxidant. Sophisticated kinetic studies have suggested the nature of adsorbed oxygen species and their binding strength as key parameters for undesired methane oxidation to carbon oxides. These descriptors can be controlled by a metal oxide promoter for Gd 2 O 3 .

Carbon fibers

10.1002/anie.202319192

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Citations (5)

Chemical Modification of Hydroxyl-Terminated Polybutadiene and Its Application in Composite Propellants

Industrial & Engineering Chemistry Research (2021)

Pingan Zhang W. C. D. Cheong V. B. C. Tan Xilong Zhang Juan Chen Jianmin Yuan

In this article, hydroxyl-terminated polybutadiene (HTPB) was chemically transformed into multiamine, hydroxy polybutadiene (AEHTPB) by the adoption of appropriate synthesis strategies. The structure of AEHTPB was confirmed by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR). The modification degree was altered by adjusting reaction conditions to find out the effect of structural change on various physical properties, including the viscosity and glass transition temperature (Tg) of AEHTPB. Adding AEHTPB to the HTPB binder system could improve the cross-link density and strength of the polyurethane elastomer. Meanwhile, the experiment results indicated that AEHTPB could inhibit the low-temperature decomposition of ammonium perchlorate (AP) by forming a dense coating on the surface of AP. Then, the propellant level studies were conducted with the use of AEHTPB/HTPB mixture as a binder. As a result, the burning rate of propellant containing AEHTPB (5 wt %) was found to be reduced by 10.8% compared to HTPB-based propellant, and the mechanical properties of the propellant were superior to those of HTPB-based propellant with an improvement of 46.2% in tensile strength and 35.1% enhancement in elongation at break. Finally, tensile testing and observation of fracture surface morphology further demonstrated that AEHTPB had a significant bonding effect on AP-based propellant.

Hydroxyl-terminated polybutadiene

Ammonium perchlorate

10.1021/acs.iecr.0c06172

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Citations (34)

Effects of texture geometry on the tribological performance of brass with a TiN coating under lubricated rotation

AIP Advances (2019)

Juan Chen Liangcai Zeng Qiang Wan Keying Chen Yan Lu

Pin-on-disc experiments are conducted to investigate the tribological performance of untextured and textured brass surfaces with TiN coatings under oil lubrication. The surface texture is designed as a dimple pattern with different diameters and depths for the transverse surfaces of brass pins. After texturing, a TiN coating is deposited through pulsed-bias arc ion plating in a pure N2 atmosphere using a Ti target. Three dimple diameters are used, namely 130 μm, 150 μm, and 170 μm, along with three dimple depths, namely 15 μm, 40 μm, and 60 μm. The TiN coating is around 5 μm thick. Friction tests are conducted under different rotation speeds and loads, and the interfacial adhesion is assessed via a scratch test. Compared to the untextured surface, the textured one offers improved tribological behavior in mixed lubrication because the dimples generate hydrodynamic lift. To reduce friction in the case of higher speed and lower load, the optimum texture parameters are a diameter of 150 μm and a depth of 40 μm.

Dimple

Brass

Texture (cosmology)

Ion plating

10.1063/1.5124449

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Citations (5)

Experimental investigation of disc partial surface texture on the generation of hydrodynamic lubricating performance under conformal contact condition

AIP Advances (2018)

Juan Chen Liangcai Zeng Zhenpeng Wu Kuisheng Chen

A series of experiments is conducted to investigate the hydrodynamic lubricant characteristics of partial surface textured specimens. The specimens are fabricated with partial surface texture. Two dimple shapes are adopted: circular and elliptic. Four kinds of texture arrangements of elliptic dimples are designed. During each test, different rotating speeds and gaps between the tested specimen and the geometric probe are set to explain the relationship between the operation condition and load-carrying capacity. We found that the load-carrying capacity is strongly affected by the operation condition, i.e. by both speed and gap. The surface textured specimens generate large hydrodynamic lift force compared with the untextured specimen. In addition, the texture arrangements exhibit a significant impact on the lubrication property.

Dimple

Texture (cosmology)

Lift (data mining)

Fluid bearing

10.1063/1.5056192

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Citations (5)