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Ultra-high-temperature application of MXene: Stabilization of 2D Ti_(3)c_(2)T_(x) for cross-scale strengthening and toughening of 3D Tic

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Journal of Advanced ceramics 2024年第1期13卷 1-10页

作者： Lu Liu Guobing Ying Quanguo Jiang Dong Wen Peng Wang Meng Wu Ziying Ji Yongting Zheng xiang Wang Department of Materials Science and Engineering College of Mechanics and MaterialsHohai UniversityNanjing 211100China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China Shenzhen Key Laboratory for Advanced Materials School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China center for composite Materials and Structures Harbin Institute of TechnologyHarbin 150001China

Transition metal carbide/nitride cores within MXenes make them considerably useful for ultra-high-temperature ***,extensive research on Ti_(3)c_(2)T_(x) MXene has revealed its tendency to undergo a phase transition to Ticy at temperatures above 800℃due to high activity of a superficial Ti atomic ***,spark plasma sintering of Ti_(3)c_(2)T_(x) and Tic is performed to prevent the Ti_(3)c_(2)T_(x) phase transition at temperatures up to 1900℃through the fabrication of composites at a pressure of 50 *** a focused ion beam scanning electron microscope to separate layered substances in the composites and examining selected area diffraction spots in a transmission electron microscope enabled identification of non-phase-transitioned ***-principles calculations based on density functional theory indicated the formation of strong chemical bonding interfaces between Ti_(3)c_(2)T_(x) and Tic,which imposed a stability constraint on the Ti atomic layer at the Ti_(3)c_(2)T_(x) *** performance tests,such as three-point bending and fracture toughness analysis,demonstrated that the addition of Ti_(3)c_(2)T_(x) can effectively improve the cross-scale strengthening and toughening of the Tic matrix,providing a new path for designing and developing two-dimensional(2D)carbides cross-scale-enhanced three-dimensional(3D)carbides with the same elements relying on a wide variety of MXenes.

关键词： MXene ultra-high-temperature phase stability interface bonding cross-scale strengthening and toughening structural ceramic composites

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Multidimensional hollow SiO_(2)/c nanofibers modified by magnetic nanocrystals for electromagnetic energy conversion and lithium battery storage

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Nano Research 2024年第8期17卷 7301-7314页

作者： chen Han Qi Zheng Juncheng Jin Jiajia Zhang Wen-Qiang cao Kun xiang Min Zhang Mao-Sheng cao Anhui Provincial Laboratory of Biomimetic Sensor and Detecting Technology College of Materials and Chemical EngineeringWest Anhui UniversityLu’an 237012China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China

Multifunctional materials are powerful tools to support the advancement of energy conversion *** with prominent electromagnetic and electrochemical properties can realize the conversion of electromagnetic energy and solve the subsequent storage ***,an electrospinning-thermal reduction method is employed to construct ultrafine nickel nanoparticle modified porous SiO_(2)/c(Ni-SiO_(2)/c)hollow nanofibers as promising materials for applications in both electromagnetic wave absorption(EMA)and lithium-ion ***,when used as an EMA material,the reflection loss(RL)of Ni-SiO_(2)/c can reach−47.8 dB at 15.8 GHz with a matching thickness of 2.2 *** excellent microwave absorption performance can be attributed to the enhanced conduction loss,polarization relaxation,synergistic magnetic loss,and preferred impedance matching,which result from multi-component magnetic/dielectric synergy and the unique interconnected multidimensional hollow ***,the electronic conductivity and electrochemical activity of the samples are significantly enhanced due to the uniform distribution of ultrafine Ni nanoparticles in the amorphous SiO_(2)/c ***,the hierarchical hollow porous structure provides sufficient free space for volume change during lithiation/delithiation ***,the Ni-SiO_(2)/c nanocomposite exhibits a high reversible capacity of 917.6 mAh·g^(−1)at 0.1 A·g^(−1).At a high current density of 2 A·g^(−1),a capacity of 563.9 mAh·g^(−1)can be maintained after 300 *** energy conversion-storage device is designed to store waste electromagnetic energy in the form of useful electrical *** work inspires the development of high-performance bifunctional materials.

关键词： Ni-SiO_(2)/c nanofiber electromagnetic absorption lithium-ion storage electrospinning multidimensional structure

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Anomalous{1012}tensile twinning and subsequent detwinning in a friction stir processed carbon fiber-reinforced Mg composite

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Journal of Magnesium and Alloys 2024年第4期12卷 1511-1517页

作者： Wei Zhao Zhihao Jiang xiang Wu Yujing Liu Haokun Yang Jun Wang Qi Liu Xiaochun Liu Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410114China Department of Mechanical Engineering City University of Hong KongHong KongChina Smart manufacturing division Hong Kong Productivity CouncilHong Kong SAR 999077China Institute for Frontier Materials Deakin UniversityGeelongVIC 3216Australia Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong KongChina

*** text Owing to their low density and high specific strength,magnesium alloys and magnesium-based composites have great potential as structure metal materials in applications where lightweight matters[1–4].Deformation twins[5],especially the{1012}tension twins(also called tensile or extension twins)with a low critical resolved shear stress(cRSS)[6],are commonly observed in Mg *** can provide the much-needed deformation along the c-axis in their hcp structure resulting from the very few easily activated slip systems in this crystal structure[7].The tensile twinning activation usually follows the macroscopic Schmid factor law[2],i.e.,the twin variant with the highest Schmid factor occurs,and it only appears when its Schmid factor is positive.

关键词： friction deformation magnesium

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High-efficiency PdNi single-atom alloy catalyst toward cross-coupling reaction

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chinese chemical Letters 2024年第7期35卷 480-483页

作者： Baokang Geng xiang chu Li Liu Lingling Zhang Shuaishuai Zhang Xiao Wang Shuyan Song Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Department of chemistry Tsinghua UniversityBeijing 100084China

The preparation of Pd-based catalysts with rich electrons and a high atom dispersion rate is of great significance for improving the reactivity of cross-coupling reactions,which is a powerful tool for pharmaceutical and fine chemical ***,we report a PdNi single-atom alloy(SAA)catalyst in which isolated Pd single atoms are anchored onto the surface of Ni nanoparticles(NPs)applied for Suzuki coupling reactions and Heck coupling *** 0.1%PdNi SAA exhibits extraordinary catalytic activity(reaction rate:17,032.25 mmol h^(-1)gPd^(-1))toward the Suzuki cross-coupling reaction between 4-bromoanisole and phenylboronic acid at 80℃for 1 *** excellent activity is supposed to attribute to the 100 percent utilization rate of Pd atoms and the highly stable surface zero-valance Pd atoms,which provides abundant sites and electrons for the adsorption and fracture of the c-X(X=cl,Br,I)***,our work demonstrates the excellent application prospect of SAAs for cross-coupling reactions.

关键词： Single-atom alloy cross-coupling reaction Palladium catalysis Heterogeneous catalysis High-efficiency

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Effect of tungsten carbide particles on microstructure and mechanical properties of cu alloy composite bit matrix

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Journal of Iron and Steel Research International 2024年第2期31卷 519-530页

作者： Ding-qian Dong Feng-yuan He Xin-hui chen Hui Li Kai-hua Shi Hui-wen Xiong Xin xiang Li Zhang college of Mechanical Engineering Sichuan University of Science and EngineeringZigong643000SichuanChina State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083HunanChina Zigong cemented carbide co. Ltd.Zigong643011SichuanChina Material corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science and EngineeringZigong643000SichuanChina

copper alloy composite bit matrix was prepared by pressureless vacuum infiltration,using at least one of the three kinds of tungsten carbide particles,for example,irregular cast tungsten carbide,monocrystalline tungsten carbide and sintered reduced tungsten carbide *** effects of powder particle morphology,particle size and mass fraction of tungsten carbide on the microstructure and mechanical properties of copper alloy composite were investigated by means of scanning electron microscopy,X-ray diffraction and abrasive wear test in *** results show that tungsten carbide morphology and particle size have obvious effects on the mechanical properties of copper alloy *** tungsten carbide partially dissolved in the copper alloy binding phase,and layers of cu_(0.3)W_(0.5)Ni_(0.1)Mn_(0.1)c phase with a thickness of around 8–15μm were formed on the edge of the cast tungsten *** 45%irregular crushed fine cast tungsten carbide and 15%monocrystalline cast tungsten carbide were used as the skeleton,satisfactory comprehensive performance of the reinforced copper alloy composite bit matrix was obtained,with the bending strength,impact toughness and hardness reaching 1048 MPa,4.95 J/cm^(2) and 43.6 HRc,*** main wear mechanism was that the tungsten carbide particles firstly protruded from the friction surface after the copper alloy matrix was worn,and then peeled off from the matrix when further wear occurred.

关键词： Polycrystalline diamond compact Pressureless vacuum infiltration copper alloy composite bit matrix Microstructure characterization Abrasive wear behavior

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Tailored architecture of composite electrolyte for all-solid-state sodium batteries with superior rate performance and cycle life

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Nano Research 2024年第5期17卷 4171-4180页

作者： xiang Guan Zhenhua Jian Xingan Liao Wenchao Liao Yanfei Huang Dazhu chen Robert K.Y.Li chen Liu Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong KongChina

Seeking for composite electrolytes reinforced all-solid-state sodium ion batteries with superior long lifespan and rate performance remains a great ***,a unique strategy to tailor the architecture of composite electrolyte via inserting polymer chains into a small quantity of sulfate sodium grafted c_(48)0H_(28)O_(32)Zr_(6)(UIOSNa)is *** intimate contact between polymer segments and UIOSNa with limited pore size facilitates the anion immobilization of sodium salts and reduction of polymer crystallinity,thereby providing rapid ion conduction and reducing the adverse effect caused by the immigration of *** tNa+grafting of-SO_(3)Na groups on fillers allows the free movement of more sodium ions to further improve and ionic ***,even with the low content of UIOSNa fillers,a high ionic conductivity of 6.62×10^(-4) S·cm^(-1) at 60℃ and a transference number of 0.67 for the special designed composite electrolyte are *** assembled all-solid-state sodium cell exhibits a remarkable rate performance for 500 cycles with 95.96%capacity retention at a high current rate of 4 *** corresponding pouch cell can stably work for 1000 cycles with 97.03%capacity retention at 1 c,which is superior to most of the reported composite electrolytes in the literature.

关键词： solid state sodium battery composite electrolyte rate performance cycle life

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Metabolic disorders and hepatitis: Insights from a Mendelian randomization study

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World Journal of Gastrointestinal Surgery 2024年第6期16卷 1775-1790页

作者： Ling-Bo Liang xiang-Ping Liu Ting-Rui Mao Qiao-Li Su General Practice Ward General Practice Medical CenterWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Primary Health care The Fourth People’s Hospital of Dazhu CountyDazhou 635100Sichuan ProvinceChina

BAcKGROUND Hepatitis is a systemic disease that often results in various ***-bolic disorders,the most common comorbidities in clinical practice,were selected for this *** To investigate the causal relationship between comorbidities and hepatitis trea-tment *** A total of 23583378 single nucleotide polymorphisms from 1248743 cases and related summaries of genome-wide association studies were obtained from online public databases.A two-sample Mendelian randomization(MR)was performed to investigate causality between exposure[type 2 diabetes mellitus(T2D),hyperlipidemia,and hypertension]and outcome(chronic hepatitis B or c in-fections).RESULTS The data supported the causal relationship between comorbidities and hepatitis infections,which will affect the severity of hepatitis progression and will also provide a reference for clinical *** three exposures showed a link with progression of both hepatitis B(T2D,P=0.851;hyperlipidemia,P=0.596;and hypertension,P=0.346)and hepatitis c(T2D,P=0.298;hyperlipidemia,P=0.141;and hypertension,P=0.035).cONcLUSION The results of MR support a possible causal relationship between different ex-posures(T2D,hyperlipidemia,and hypertension)and chronic hepatitis progression;however,the potential mechanisms still need to be elucidated.

关键词： Hepatitis comorbidity Type 2 diabetes mellitus Hyperlipidemia Hypertension

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Unveiling ferroptosis as a promising therapeutic avenue for colorectal cancer and colitis treatment

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AcTA PHARMAcEUTIcA SINIcA B 2024年第9期14卷 3785-3801页

作者： Kao, Aaron T. V. cabanlong, christian Padilla, Kendra Xue, xiang Univ New Mexico Dept Biochem & Mol Biol Albuquerque NM 87131 USA

Ferroptosis is a novel type of regulated cell death (RcD) involving iron accumulation and lipid peroxidation. Since its discovery in 2012, various studies have shown that ferroptosis is associated with the pathogenesis of various diseases. Ferroptotic cell death has also been linked to intestinal dysfunction but can act as either a positive or negative regulator of intestinal disease, depending on the cell type and disease context. The continued investigation of mechanisms underlying ferroptosis provides a wealth of potential for developing novel treatments. considering the growing prevalence of intestinal diseases, particularly colorectal cancer (cRc) and inflammatory bowel disease (IBD), this review article focuses on potential therapeutics targeting the ferroptotic pathway in relation to cRc and IBD. (c) 2024 The Authors. Published by Elsevier B.V. on behalf of chinese Pharmaceutical Association and Institute of Materia Medica, chinese Academy of Medical Sciences. This is an open access article under the cc BY license (http://***/licenses/by/4.0/).

关键词： Ferroptosis colorectal cancer Inflammatory bowel disease cell death Molecular mechanisms Iron metabolism Drug therapies Targeted therapeutics ENDOPLASMIc-RETIcULUM STRESS INFLAMMATORY-BOWEL-DISEASE cELL-DEATH PROMOTES FERROPTOSIS MOLEcULAR-MEcHANISMS ULcERATIVE-cOLITIS IRON-METABOLISM SYSTEM X(c)(-) FERRITIN IRON ER STRESS

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Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with Zncl_(2) via modifying cellulose structure

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chinese Journal of chemical Engineering 2024年第5期69卷 227-237页

作者： Linghui Kong chao Li Runxing Sun Shu Zhang Yi Wang Jun xiang Song Hu Dong Wang chuanjun Leng Xun Hu School of Material Science and Engineering University of JinanJinan 250022China Joint International Research Laboratory of Biomass Energy and Materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China State Key Laboratory of coal combustion Huazhong University of Science and TechnologyWuhan 430074China Shandong BASAN Graphite New Material Plant Zibo 255311China

Development of pore structures of activated carbon(Ac)from activation of biomass with Zncl_(2) relies on content and structure of cellulose/hemicellulose in the *** pretreatment of biomass could induce dehydration and/or aromatization to change the structure of cellulose/*** might interfere with evolution of structures of Ac,which was investigated herein via thermal pretreatment of willow branch(WB)from 200 to 360℃and the subsequent activation with Zncl_(2) at 550℃.The results showed that thermal pretreatment at 360℃(WB-360)could lead to substantial pyrolysis to form biochar,with a yield of 31.9%,accompanying with nearly complete destruction of cellulose crystals and remarkably enhanced aromatic ***,cellulose residual in WB-360 could still be activated to form Ac-360 with specific surface area of 1837.9 m~2·g^(-1),which was lower than that in Ac from activation of untreated WB(Ac-blank,2077.8 m~2·g^(-1)).Nonetheless,the Ac-200 from activation of WB-200 had more developed pores(2113.9 m~2·g^(-1))and superior capability for adsorption of phenol,due to increased permeability of Zncl_(2) to the largely intact cellulose structure in *** thermal pretreatment did increase diameters of micropores of Ac but reduced the overall yield of Ac(26.8%for Ac-blank versus 18.0%for Ac-360),resulting from accelerated cracking but reduced intensity of ***-situ infrared characterization of the activation showed that Zncl_(2) mainly catalyzed dehydration,dehydrogenation,condensation,and aromatization but not cracking,suppressing the formation of derivatives of cellulose and lignin in *** thermal pretreatment formed phenolic-OH and c=O with higher chemical innerness,which changed the reaction network in activation,shifting morphology of fibrous structures in Ac-blank to“melting surface”in Ac-200 or Ac-280.

关键词： Thermal pretreatment Activation with Zncl_(2) Willow branch Activated carbon Biochar

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Astrometric Observations of NEA 1998 HH49 Using the Daocheng 50 cm Telescope

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Research in Astronomy and Astrophysics 2024年第7期24卷 71-78页

作者： Huan Xu xiang-Ming cheng Yi-Gong Zhang Teng-Fei Song Zhen-Jun Zhang Qing-Yu Peng Yunnan Observatories Chinese Academy of SciencesKunming 650216China University of chinese Academy of Sciences Beijing 100049China Key Laboratory of the Structure and Evolution of celestial Objects Chinese Academy of SciencesKunming 650216China Engineering Laboratory on Applied Astronomical Technology of Yunnan Kunming 650216China School of Information Engineering Kunming UniversityKunming 650214China School of computer Science and Information Engineering Anyang Institute of TechnologyAnyang 455000China Department of computer Science Jinan UniversityGuangzhou 510632China Sino-French Joint Laboratory for Astrometry Dynamics and Space ScienceJinan UniversityGuangzhou 510632China

This study details an astrometric observation campaign of the Near-Earth Asteroid 1998 HH49,conducted with the aim of refining our understanding of its physical *** the 50 cm telescope located at the Wumingshan Mountain in Daocheng,Sichuan,images were obtained over four nights,from 2023 October 19 to October *** observations were processed using Astrometrica software,facilitating the precise determination of the asteroid's *** observational results were compared with the ephemerides from three distinct sources to verify accuracy:the Jet Propulsion Laboratory(JPL)Horizons System,the Institut de Mécanique céleste et de calcul deséphémérides(IMccE)Miriade,and the Near-Earth Objects Dynamic Site(NEODyS-2).When compared with the JPL ephemeris,a mean observed-minus-calculated(O-c)result of 0.″07 in the *** and-0.″35 in the *** was ***,the comparison with the IMccE ephemeris yielded mean O-c results of 0.″08 in the *** and-0.″06 in the *** comparison with the NEODyS-2 ephemeris yielded the mean O-c results of 0.″06 in ***-0.″49 in *** study's findings demonstrate a general consistency between the observed data and the ephemeris predictions,with minor discrepancies observed across the data ***,both the JPL and NEODyS-2 ephemerides show that the residuals in the *** exceed those in the *** disparities may result from atmospheric differential color refraction,ephemeris discrepancies,observational errors,and other ***,it is worth noting that further investigation is required due to the potential influence of additional ***,the Daocheng 50 cm Telescope exhibits the ability to conduct high-precision positional measurements.

关键词： astrometry ephemerides time

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