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One-step accurate synthesis of shell controllable CoFe2O4 hollow microspheres as high-performance electrode materials in supercapacitor

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Nano Research 2016年第7期9卷 2026-2033页

作者： Zhuo Wang Wei Jia menglei jiang Chen Chen Yadong Li Department of Chemistry & Collaborative Innovation Center for Nanomaterial Science and Engineering Tsinghua University Beijing 100084 China Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China

Multi-shelled CoFe2O4 hollow microspheres with a tunable number of layers （1-4） were successfully synthesized via a facile one-step method using cyclodextrin as a template, followed by calcination. The structural features, including the shell number and shell porosity, were controlled by adjusting the synthesis parameters to produce hollow spheres with excellent capacity and durability. This is a straightforward and general strategy for fabricating metal oxide or bimetallic metal oxide hollow microspheres with a tunable number of shells.

关键词： hollow spheres multi-shelled CoFe2O4 supercapacitor

Free-standing palladium-nickel alloy wavy nanosheets

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Nano Research 2016年第8期9卷 2244-2250页

作者： Weng-Chon Cheong Chuhao Liu menglei jiang Haohong Duan Dingsheng Wang Chen Chen Yadong Li Department of Chemistry and Collaborative Innovation Center for Nanomaterials Science and Engineering Tsinghua UniversityBeijing 100084 China

Two-dimensional nanomaterials （2DNMs） have attracted increasing attention due to their unique properties and promising applications. Unlike 2DNMs with lamellar structures, metal ultrathin 2DNMs are difficult to synthesize and stabilize because they tend to form close-packed crystal structures. Most reported cases consist of monometallic and heterogeneous nanostructures. The synthesis of metal alloy 2DNMs has been rarely reported. Here, we report the synthesis of PdNi alloy wavy nanosheets （WNSs） using an enhanced CO-confinement strategy. This strategy is also suitable to the synthesis of other Pd-based alloy WNSs such as PdCu, PdFe, and even a trimetallic PdFeNi.

关键词： Pd Ni alloy nanosheets carbon monoxide

Helium Bubble Growth in He^(+) Ions Implanted 304L Stainless Steel Processed by Laser Powder Bed Fusion During Post-Irradiation Annealing at 600℃

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1509-1518页

作者： Hui Liu Shiling Min menglei jiang Fuzhong Chu Ying Li Zhuoer Chen Kai Zhang Juan Hou Aijun Huang School of Materials Science and Chemistry University of Shanghai for Science and TechnologyShanghai200093China Department of Industrial and Materials Science Chalmers University of Technology41326GothenburgSweden Monash Centre for Additive Manufacturing(MCAM) Monash UniversityNotting HillVIC3168Australia State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co.Ltd.Shenzhen518172China

The abundancy of defect sinks in the microstructure of laser powder bed fusion(LPBF) processed austenitic stainless steels was found to be beneficial for helium *** the current study,the influence of the novel microstructure in LPBF processed 304 L on the helium bubble growth behaviour was investigated using transmission electron microscopy in samples implanted with He^(+) ion and post-irradiation annealing treated at 600℃ for 1 *** variants of LPBF processed 304 L samples were used,one in as-built condition and the other *** comparison between the two samples indicated that the helium bubble growth was inhibited and remained stable in the as-built sample but coarsened significantly in the solution-annealed *** sub-grain boundaries and oxide nano-inclusions acted as defect sinks to trap helium atoms and inhibited the growth of helium bubble in the as-built sample under the post-irradiation annealing conditions used.

关键词： Laser powder bed fusion Stainless steel Helium bubble growth Irradiation tolerance Nano oxide inclusions

A Brief Review on He Ion Irradiation Research of Steel and Iron‑Based Alloys in Nuclear Power Plants

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 529-551页

作者： Siyi Qiu Hui Liu menglei jiang Shiling Min Yanlin Gu Qingyan Wang Jing Yang Xuejun Li Zhuoer Chen Juan Hou School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China China Nuclear Power Engineering Co.Ltd Shenzhen 518124China Department of Industrial and Materials Science Chalmers University of Technology41326 GothenburgSweden State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co.LtdShenzhen 518172China

Nuclear power plays a key role as renewable energy in alleviating the worldwide energy *** material degradation caused by high-temperature and high-flux neutron irradiation is the most concerning issue for nuclear reactor safety.A large number of He atoms produced through the(n,α)transmutation reaction diffuse and migrate in metals and accumulate to form He bubbles because of the extremely low solubility of He atoms in metal *** helium bubbles gather at the grain boundary or grain to cause swelling,hardening,embrittlement,and other damages to the in-core structural *** paper mainly summarizes the research progress on He irradiation in steel and iron-based alloys,including the diffusion and accumulation of He atoms,the nucleation and growth of He bubbles,and the microstructure and macroscopic degradation of material performance caused by He *** mechanism of helium irradiation-induced corrosion in steel and iron-based alloys in recent years is reviewed as ***,the investigations on irradiation performance in additive manufactured stainless steels are summarized,and the mechanism of irradiation resistance is prospected.

关键词： Irradiation Helium bubbles Nuclear stainless steel Additive manufacture

Effect of Heat Treatment on the Microstructure,Mechanical Properties and Corrosion Resistance of Selective Laser Melted 304L Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1688-1702页

作者： Fan Yang Daigen Zhu menglei jiang Hui Liu Shiri Guo Qingyan Wang Hui Wang Kai Zhang Aijun Huang Juan Hou School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai200093China Institute for Advanced Study Chengdu UniversityChengdu610106China Monash Centre for Additive Manufacturing(MCAM) Monash UniversityNotting HillVIC3168Australia State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen518172China

The influence of heat treatment holding temperatures from 600 to 1300℃ on the microstructure,mechanical properties and corrosion resistance in selective laser melted(SLMed)304L stainless steel is investigated in this *** results reveal that there is no remarkable microstructure change after holding at 600℃ for 2 h,while recrystallization leads to a slight decrease in grain size in the temperature range of 700–900℃.The heat treatment at temperatures from 1000 to 1300℃ for 2 h obviously affects the morphology of grains in SLMed 304L stainless *** effects of grain coarsening,delta-ferrite(δ)phases reduction and residual stress release during heat treatment lead to the reduction of yield strength and an increasing *** elongation of the samples heat treated at 800℃ for 2 h is,however,significantly decreased due to the increase in the amount of sigma(σ)phase.A remarkable increase in the amount ofδferrite results in an increase in yield strength but a decrease in ductility after heat treatment at 1300℃ for 2 *** corrosion resistance of the samples heat treated at 1300℃ is significantly improved due to the substantial reduction of brittle phase(σ).There is no obvious effect of the presence ofδferrite on corrosion behavior.

关键词： Selective laser melting 304L stainless steel Heat treatment δferrite Mechanical properties Corrosion resistance

In-situ fabrication of on-chip 1T'-MoTe_(2)/Ge Schottky junction photodetector for self-powered broadband infrared imaging and position sensing

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Nano Research 2024年第6期17卷 5587-5594页

作者： menglei Zhu Kunxuan Liu Di Wu Yunrui jiang Xue Li Pei Lin Zhifeng Shi Xinjian Li Ran Ding Yalun Tang Xuechao Yu Longhui Zeng School of Physics and Microelectronics and Key Laboratory of Material PhysicsZhengzhou UniversityZhengzhou 450052China Department of Electrical and Computer Engineering University of California San DiegoLa JollaCA 92093USA State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

High-sensitivity room-temperature multi-dimensional infrared(IR)detection is crucial for military and civilian ***,the gapless electronic structures and unique optoelectrical properties have made the two-dimensional(2D)topological semimetals promising candidates for the realization of multifunctional optoelectronic ***,we demonstrated the in-situ construction of high-performance 1T’-MoTe_(2)/Ge Schottky junction device by inserting an ultrathin AlOx passivation *** good detection performance with an ultra-broadband detection wavelength range of up to 10.6 micron,an ultrafast response time of~160 ns,and a large specific detectivity of over 109 Jones in mid-infrared(MIR)range surpasses that of most 2D materials-based IR sensors,approaching the performance of commercial IR *** on-chip integrated device arrays with 64 functional detectors feature high-resolution imaging capability at room *** these outstanding detection features have enabled the demonstration of position-sensitive detection *** demonstrates an exceptional position sensitivity of 14.9 mV/mm,an outstanding nonlinearity of 6.44%,and commendable trajectory tracking and optoelectronic demodulation *** study not only offers a promising route towards room-temperature MIR optoelectronic applications,but also demonstrates a great potential for application in optical sensing systems.

关键词： MoTe_(2) broadband photodetection Schottky junction imaging position sensitive detector

尺寸设计对选区激光熔化304L不锈钢显微组织与性能的影响

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金属学报 2023年第5期59卷 623-635页

作者：侯娟代斌斌闵师领刘慧蒋梦蕾杨帆中广核工程有限公司核电安全监控技术与装备国家重点实验室深圳518172 上海理工大学材料与化学学院上海200082

采用选区激光熔化(SLM)技术制备304L不锈钢样品,通过改变扫描道次(T)和打印层数(L)实现不同的温度梯度与凝固速率,研究尺寸效应对微观组织与力学性能的影响。具有不同T×L组合的SLM 304L不锈钢样品沿打印构建方向形成柱状晶组织,并且尺... 详细信息

采用选区激光熔化(SLM)技术制备304L不锈钢样品,通过改变扫描道次(T)和打印层数(L)实现不同的温度梯度与凝固速率,研究尺寸效应对微观组织与力学性能的影响。具有不同T×L组合的SLM 304L不锈钢样品沿打印构建方向形成柱状晶组织,并且尺寸效应影响柱状晶结构。随尺寸增大,凝固组织沿散热方向择优生长的程度高,柱状晶的连续性更好,由低长径比的“米粒形”向近等轴的“短窄形”、进而向高长径比的“长条形”过渡,晶粒粗化现象明显。在较大尺寸样品中,随着不断远离基板也观察到了类似现象。尺寸效应对力学性能的影响主要体现在随着打印尺寸增加,材料的屈服强度下降而塑性延伸率上升,但当尺寸增加至一定程度后力学性能变化趋于稳定。尺寸效应对SLM 304L不锈钢的析出相组成和含量无明显影响。结果表明,影响力学性能的主要影响因素为柱状晶的尺寸和分布,在较大尺寸的样品中,“长条形”柱状晶占比高,导致材料强度降低而塑性增加。结合ANSYS ADDITIVE对凝固速率和温度梯度的模拟仿真结果,对尺寸效应通过影响凝固过程进而对材料微观组织和力学性能产生影响的机理进行了阐述。

关键词：选区激光熔化 304L不锈钢尺寸效应凝固特征力学性能

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中国教育学话语建构的三重限度及其超越

现代大学教育 2024年第4期40卷 8-17页

作者：赵梦雷姜朝晖淮北师范大学教育学院淮北235000 中国教育科学研究院教育理论研究所北京100088

构建中国教育学是新时代教育大国迈向教育强国的内在要求,其话语关涉谁在说、说什么、怎么说、有何影响的问题,为推动中国教育学自主知识体系的建构提供有力支撑。中国教育学话语建构要警惕三重限度的产生。其一,在话语议题上,中国教育... 详细信息

构建中国教育学是新时代教育大国迈向教育强国的内在要求,其话语关涉谁在说、说什么、怎么说、有何影响的问题,为推动中国教育学自主知识体系的建构提供有力支撑。中国教育学话语建构要警惕三重限度的产生。其一,在话语议题上,中国教育学要突破话语单一化,不能为突出重要性而忽略多样性。其二,在话语应用上,中国教育学要规避话语机械化,不能为突出应用性而忽略情境性。其三,在话语范式上,中国教育学要突破话语孤立化,不能为突出独特性而忽略学术创新性。中国教育学话语建构需:运用比较教育视角,丰富教育学话语议题的多样性;强化问题情境导向,提升教育学话语应用的适切性;注重学术质量标准,增强教育学话语范式的普适性。

关键词：中国教育学话语议题话语应用话语范式话语建构学术创新

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面向中国式现代化的教育学自主知识体系建构

国家教育行政学院学报 2024年第4期316卷 40-47页

作者：赵梦雷姜朝晖中国教育科学研究院北京100088

中国式现代化概念的提出,为中国式现代化理论建构迎来了重要的学术话语建构与升华的历史契机。面向中国式现代化,不仅是以教育强国建设引领教育学自主知识体系建构的时代需要,而且是中国教育学自主知识体系建构过程中总结教育成就经验... 详细信息

中国式现代化概念的提出,为中国式现代化理论建构迎来了重要的学术话语建构与升华的历史契机。面向中国式现代化,不仅是以教育强国建设引领教育学自主知识体系建构的时代需要,而且是中国教育学自主知识体系建构过程中总结教育成就经验、回应问题挑战的现实需要,同时也是中国教育学自主知识体系为世界贡献中国教育理论的战略需要。其建构逻辑彰显出中国特色社会主义教育学自主知识生产的特质、弘扬中国教育学自主知识创新的精神、表达中国式现代化知识探索的诉求以及展现人类文明知识创生的向度。在方法上,面向中国式现代化的教育学自主知识体系建构要优先考虑人民的利益和需求,坚定教育创新的独立精神和信心,秉持传统价值与现代创新的教育原则,坚持问题导向的行动准则,把握教育系统观念的整体思维,倡导教育的全球参与和合作的实践探索与理论创新要求。

关键词：中国式现代化中国教育学自主知识知识生产