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Influence of conversion rate of Si to SiC of C/C-SiC for high-speed trains on braking behavior at high braking energy density

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Ceramics International 2025年

作者： Xu, Yuxuan Li, Zesheng Chen, Qi Liu, Donglin Wang, Xing Liu, Ziyi Chen, Deshan Zhou, Haibin Han, Yong Yao, Pingping State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China

The effects of the conversion rate of Si to SiC (Rs) on braking behavior was investigated. The results indicate that a moderate Rs (38.360) combined with a uniform distribution of pyrolytic carbon facilitates the formation of a homogeneous metal tribo-layer, maintaining a stable coefficient of friction (COF) and superior wear resistance. High Rs (92.518) and lower pyrolytic carbon concentration are more susceptible to abrasive and fatigue wear, leading to surface delamination. Fewer Rs (9.475) and abundant pyrolytic carbon contribute to the high-temperature oxidation of pyrolytic carbon accelerates adhesive wear, resulting in an increased COF and inferior wear resistance. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Silicon carbide

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Enhanced stability and efficiency of enzyme-inorganic hybrid nanoflowers for organophosphate degradation

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International Journal of Biological Macromolecules 2025年 313卷 144312页

作者： Zhao, Qianqian Zhang, Xiaohong Chen, Zhenzhen Hu, Tianfeng Wang, Sai Deng, Lingfeng Chen, Zhiyan Bai, Yuanjuan Du, Kun Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology College of Materials Science and Engineering Central South University of Forestry and Technology Shaoshan South Road No. 498 Changsha410004 China

Enzyme catalysis is characterized by high efficiency and selectivity;however, the natural enzymes are prone to inactivation once removed from their native environment. The immobilization of enzyme using solid-phase carriers presents an effective strategy to enhance the structural stability of natural enzymes. In this study, organophosphate hydrolase (OPH) was utilized as the organic component, while ferrous phosphate served as the inorganic component, leading to the synthesis of enzyme-inorganic hybrid nanoflower materials through biomimetic mineralization. After characterizing the microstructure and compositional characteristics of this composite material, the hydrolysis of para-nitrophenyl phosphate (PNPP) was employed as a probe reaction to determine the optimal temperature (30 °C) and the ideal pH value (9) for the immobilized enzyme. Due to the protective effect of the inorganic carrier, the immobilized enzyme exhibited significantly enhanced thermal stability, acid-base resistance, proteolytic resistance, organic solvent tolerance, and reusability compared to the free enzyme. In addition, the potential of this immobilized enzyme for stepwise degradation of toxic organophosphorus compounds by tandem hydrolysis reactions and advanced oxidation processes was further validated. This work provides a novel approach to further expand the application scope of multi-component cascade catalytic systems based on enzyme-inorganic hybrid nanoflowers. © 2025 Elsevier B.V.

关键词： Nanoflowers

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A review on dissolved organic matter derived from biochar in soil:Characterizations,interaction with pollutants,and transformation

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Journal of Central South University 2025年第1期32卷 122-148页

作者： ZHANG Xiu-xiu NAN Hong-yan LIU Gong-gang SHOW Pau-Loke WANG Chong-qing School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology College of Materials Science and EngineeringCentral South University of Forestry and TechnologyChangsha 410004China Department of Chemical Engineering Khalifa UniversityP.O.Box 127788Abu DhabiUnited Arab Emirates

Biochar-derived dissolved organic matter(BCDOM),an essential component of biochar,plays a vital role in regulating the physicochemical and biological properties of soils during biochar ***,the influence of BCDOM on soil organisms has not been clearly ***,this review aims to discuss the factors affecting BCDOM and its interaction with soil substances including organic pollutants,heavy metals,and *** displayed that the quantity of BCDOM ranges from 0.17 to 37.03 mg/g,which was influenced by feedstock,preparation methods of biochar,and extraction *** the decrease in lignin content of feedstocks,carbonization temperature,and acidity of extraction solution,the content of BCDOM *** complexation and adsorption,protein-like components in BCDOM interact with heavy metals,promoting the adsorption and immobilization of heavy metals onto ***,BCDOM enhances the adsorption of organic pollutants by biochar throughπ−πinteractions,hydrogen bonding,and redox *** importantly,BCDOM promotes plant growth by enhancing microbial activities,providing nutrients,and improving soil ***,the transport and fate of BCDOM in soil have not been well studied,and more researches are needed to explore the interaction mechanisms between BCDOM and soil organisms.

关键词： biochar dissolved organic matter heavy metals organic contaminants soil

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Graphene-enhanced tribological performance of polycrystalline high-entropy alloys: Nanoscale simulation and experimental investigation

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Tribology International 2025年 210卷

作者： Li, Jia-Le Liu, Xiu-Bo Song, Xin-Yi Cheng, Wei Li, Xin-Gong Ou, Yi-Xiang Wu, Xi-Zhi State Key Laboratory of Utilization of Woody Oil Resource Central South University of Forestry and Technology Changsha410004 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China Joint Laboratory of Advanced Energy Materials and Intelligent Equipment Beijing Academy of Science and Technology Beijing100000 China College of Mechanical and Intelligent Manufacturing Central South University of Forestry & Technology Changsha410004 China

This study investigates the influence of graphene on the nanoscale tribological behavior of polycrystalline FeNiCrCoCu high-entropy alloys (HEAs) using molecular dynamics simulations and nano-scratch experiments. The results reveal that the adsorption of graphene significantly enhances the friction reduction and wear resistance of HEAs. Graphene acts as a solid lubricant to form a uniform interfacial layer, which improves thermal dissipation, dislocation evolution and stress distribution. This mitigates wear debris accumulation and thus reduces friction-induced damage. The four-layer graphene achieves the optimal balance of interfacial lubrication, stress buffering and thermal conductivity, reducing the friction coefficient of HEAs to 0.121, a 68.66 % reduction compared to raw HEAs. Nano-scratching experiments further show that the use of moderate graphene leads to even dispersion, which promotes the formation of a stable lubricating layer, thereby reducing the friction coefficient to 0.093, a 39.61 % decrease compared to raw HEAs. This work provides insights into optimizing graphene-enhanced HEAs for improved nanoscale tribological performance, offering potential applications in high-performance coatings and microelectromechanical systems. © 2025 Elsevier Ltd

关键词： Nanoclusters

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Effect of extrusion ratio on microstructure and mechanical properties of AZ42 alloy sheet

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Transactions of Nonferrous Metals Society of China 2025年第4期35卷 1109-1121页

作者： Song-ke XIAO Xiao-jie ZHOU Gang ZENG Hong-chao XIAO Xin-kai KANG Xian-zheng LU Xiao-min CHEN Jian ZHANG Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China Hunan Provincial Key Laboratory of Advanced Aerospace Materials CASIC(Changsha)Advanced Materials Institute Co.Ltd.Changsha 410221China Hunan Provincial Engineering Research Center of Wrought Magnesium Alloys and Surface Protection Changsha 410221China SJTU−Yibin Innovation Center for Advanced Materials Yibin 644002China

The microstructure and mechanical properties of Mg−4.5Al−2.5Zn−0.3Mn−0.2Ca(wt.%,designated as AZ42)alloys in extruded(at extrusion ratios of 28,20 and 11.5)and peak-aged states were investigated,by using optical microscopy,scanning electron microscopy,energy dispersive spectrometry and electron backscatter *** results show that extrusion produces a typical basal fiber texture and streamlines of second *** samples exhibit the lowest Schmid factor of basal slip(SFb)and the superior tensile yield strength(TYS)along extrusion direction(ED).The sample with extrusion ratio of 20 exhibits the largest average grain size,but the smallest SFb which compensates for the disadvantage of grain coarsening and maintains the *** being peak-aged at 175℃for 48 h,the sample with the extrusion ratio of 20 shows the optimal TYS along all the directions,compared to the other *** hopes to provide useful information for optimizing the deformation parameters of the AZ42 alloys.

关键词： AZ42 alloy extrusion ratio Schmid factor strength aging-hardening

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Electrochemically and chemically in-situ interfacial protection layers towards stable and reversible Zn anodes

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science Bulletin 2025年第1期70卷 104-124页

作者： Yuqing Yang Liping Qin Qiong He Chengjie Yin Yongpeng Lei Shuquan Liang Guozhao Fang School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083China College of Biological and Chemical Engineering Guangxi University of Science and TechnologyNanning 545006China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China National Energy Metal Resources and New Materials Key Laboratory Central South UniversityChangsha 410083China

Aqueous zinc metal batteries(AZMBs)have received widespread attention for large-scale sustainable energy storage due to their low toxicity,safety,***,the technology and industrialization of AZMBs are greatly plagued by issues of Zn anode such as persistent dendrites and parasitic side reactions,resulting in rapid capacity degradation or battery *** or chemically in-situ interfacial protection layers have very good self-adaption features for stability and reversibility of Zn anodes,which can also be well matched to current battery ***,the in-situ interfacial strategies are far from the practical design for effective Zn ***,a targeted academic discussion that serves the development of this field is very ***,the comprehensive insights on electrochemically and chemically in-situ interfacial protection layers for Zn anode were proposed in this *** showcased a systematic summary of research advances,followed by detailed discussions on electrochemically and chemically in-situ interfacial protection *** importantly,several crucial issues facing in-situ interfacial protection strategies have been further put *** final section particularly highlighted a systematic and rigorous scheme for precise designing highly stable and reversible in-situ interface for practical zinc anodes.

关键词： In-situ strategy Interfacial layer Zn anode Solid electrolyte interphase Aqueous zinc metal batteries

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Tryptophan, uric acid, and dopamine detected simultaneously using an accurate and affordable electrochemical sensor based on Co9S8-supported electrochemically reduced graphene oxide

Results in Engineering

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Results in Engineering 2025年 26卷

作者： Deng, Peihong Chen, Aiting Shi, Shuting Zhou, Chuanqin Tang, Nana He, Quanguo Key Laboratory of Organometallic New Materials Key Laboratory of Functional Metal-Organic Compounds of Hunan Province Department of Chemistry and Material Science Hengyang Normal University Hengyang421008 China College of Life Science and Chemistry Hunan University of Technology Zhuzhou412007 China

A cost-effective and simple electrochemical approach was developed for the simultaneous detection of tryptophan (Trp), uric acid (UA) and dopamine (DA). Through hydrothermal synthesis, Co9S8 was combined with graphene oxide (GO) using physical ultrasound. Subsequently, the Co9S8-RGO/GCE was created by electrochemically reducing a Co9S8-GO dispersion after drop-coating it onto the GCE surface. The amalgamation of Co9S8 with RGO conferred the sensor with remarkable sensitivity, outstanding selectivity, and robust catalytic prowess towards DA, UA and Trp. The ternary mixture exhibited notable peak separations of up to 160 mV, 278 mV, and 438 mV between DA–UA, UA–Trp, and DA–Trp, respectively. The linear calibration ranges spanned 0.1–2.0 μM and 2.0–10 μM for DA, 0.06–10 μM for UA, and 0.02–10 μM for Trp, with matching 0.04 µM for DA, 0.02 µM for UA, and 6.0 nM for Trp detection limits (S/N = 3). Moreover, the sensor's effective use in the identification of DA, UA and Trp in authentic samples yielded satisfactory results. © 2025 The Author(s)

关键词： Hydrothermal synthesis

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Plasmon-assisted channel-tunable bistable states in a monolayer MoS2 nanoresonator coupled to a metallic nanoshell

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Optics Express 2025年第11期33卷 23568-23578页

作者： Jian-Bo Li Hong-Mei Gong Yu-Xiang Peng Si Xiao Jin-Bo Hu Lin-Wen Long Department of Physics Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology Central South University of Forestry and Technology Changsha 410004 China jbli_opt@*** jbli_opt@*** School of Optical and Electronic Information & Jiangsu/Suzhou Key Laboratory of Biophotonics & International Joint Metacenter for Advanced Photonics and Electronics Suzhou City University Suzhou 215104 China hmgong@*** School of Physics Hunan Key Laboratory of Super microstructure and Ultrafast Process Central South University Changsha 410083 China sixiao@*** College of Materials and Energy Central South University of Forestry and Technology Changsha 410004 China

We study how to obtain the channel-tunable bistable states in a coupled system consisting of a monolayer MoS 2 nanomechanical resonator (NR) and a metallic nanoshell (MNS) beyond the dipole approximation. The MNS is constructed by a metallic core and a dielectric shell. The calculated results show that the linear absorption spectrum exhibits some new features, such as three-phonon resonance, Rayleigh resonance, and ac-Stark resonance. In a strong exciton-plasmon coupling regime, the absorption peak and amplification peak in the absorption spectrum can be greatly enhanced by adjusting the exciton-phonon coupling strength. Especially, we plot the bistability phase diagrams in the system’s parameter space and highlight the strong dependency of the lower (upper) bistable threshold on the pumping intensity, the MNS-NR distance, and the dielectric shell thickness. The ratio of linear absorption in the upper and lower stable states can reach 42. For a given MNS with a fixed shell thickness, it is easy to achieve single-channel or dual-channel bistable states by only adjusting the exciton-phonon coupling strength via modulation of the length of the MoS 2 nanosheet along the NR axis. The findings obtained here are very useful for extensive applications such as optical memory cells and channel-tunable bistable switches.

关键词： Absorption spectroscopy Light propagation Metal nanoparticles Nonlinear absorption Optical properties Slow light

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Topological insulator in twisted transition metal dichalcogenide heterotrilayers

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Physical Review B 2025年第12期111卷 125410-125410页

作者： Hao He Zhao Gong Qing-Jun Tong Dawei Zhai Wang Yao Xing-Tao An Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface School of Science Hebei University of Science and Technology Shijiazhuang 050018 China School of Physical Science and Electronics Hunan University Changsha 410082 China New Cornerstone Science Laboratory Department of Physics The University of Hong Kong Hong Kong China HK Institute of Quantum Science and Technology The University of Hong Kong Hong Kong China

The quantum spin Hall effect has been predicted in twisted homobilayer transition metal dichalcogenides (TMDs) owing to the layer-pseudospin magnetic field. Recently, experimental observations have also confirmed such topological states of matter. However, the topological electronic properties in multilayer moiré superlattices remain to be further explored. In twisted TMDs heterotrilayers, the realization of a moiré potential with various symmetries becomes feasible. Here, we demonstrate that twisted trilayer TMDs can enter a topological insulator phase under the influence of a moiré potential with C6 symmetry. Specifically, we built two types of trilayer heterostructures, where the low-energy valence band electrons are contributed by the middle layer. In the AA-stacked moiré WS2/WSe2/MoS2 heterotrilayers where only the middle layer is twisted, the maxima of the moiré potential exhibit an approximate C6 symmetry. The C6 symmetry effectively compensates for the spatial inversion symmetry breaking in the WSe2 layer, leading to a twist-angle-dependent topological phase transition. Leveraging a Green's function approach, we calculate the local state density of edge states at topological minigaps, confirming their nature as moiré edge states. In the helical twisted AA-stacked moiré MoS2/WSe2/MoS2 heterotrilayers, we observed a mosaic pattern of topological and trivial insulators. The emergence of a topological mosaic is attributed to the maxima of the local moiré potential possessing C6 symmetry. The results provide a way for the experimental realization of topological phases in TMDs heterojunctions.

关键词： Topological insulators

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Dipole-polarized Cu–Ni atomic interfaces for synergistic enhancement and steering of overall nitrogen photofixation

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Chemical Engineering Journal 2025年 513卷

作者： Li, Longjian Zhang, Ping Tuerhong, Reyila Yu, Yongchong Chai, keyi Zhao, Lianbiao Su, Xiaoping Han, Lijuan Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission Gansu Province Engineering Research Center for Biomass Functional Composite Materials Key Laboratory for the Utilization of Environment Friendly Composite Materials and Biomass in Universities of Gansu Province Gansu Province Research Center for Basic Sciences of Surface and Interface Chemistry College of Chemical Engineering Northwest Minzu University Lanzhou730030 China Gansu Natural Energy Research Institute Gansu Academy of Science Lanzhou730046 China

Enabling the oxidation of ammonia (NH3), a product of nitrogen (N2) reduction, to nitric acid (HNO3) can boost the economic value of overall N2 photofixation. In this work, we constructed a Cu doped NiO@C nanosheets photocatalyst with dipole polarization effect, achieving efficient overall N2 photofixation (N2 → NH3 → HNO3) with a relatively high proportion of NO3− (92.3 %). Mechanistic studies reveal that the band structure modulation of photocatalyst and thus enhanced the oxidation capacity, further significantly promoted the NH3 → HNO3 pathway and increased the proportion of NO3− in the overall N2 photofixation products. The local polarization brought along the Cu-Ni atomic interface, which promoted photo-excited charge transfer process, enhanced N2 absorption/activation capability and promoted the N2 → NH3 pathway. First-principles density functional theory (DFT) calculations demonstrate that the Cu doping strategy reduce the N2 reduction reaction (NRR) energy barrier. This work provides an approach for optimizing the overall N2 photofixation through band structure modulation and dipole polarization effect. © 2025 Elsevier B.V.

关键词： Nitrogen

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