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Structural Engineering of Hierarchical Magnetic/Carbon Nanocomposites via In Situ Growth for High-Efficient Electromagnetic Wave Absorption

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Nano-Micro Letters 2024年第9期16卷 262-278页

作者： Xianyuan Liu Jinman Zhou Ying Xue xianyong lu Key Laboratory of Bio‑Inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191People’s Republic of China

Materials exhibiting high-performance electromagnetic wave absorption have garnered considerable scientific and technological attention,yet encounter significant *** new materials and innovative structural design concepts is crucial for expanding the application field of electromagnetic wave ***,hierarchical structure engineering has emerged as a promising approach to enhance the physical and chemical properties of materials,providing immense potential for creating versatile electromagnetic wave absorption ***,an exceptional multi-dimensional hierarchical structure was meticulously devised,unleashing the full microwave attenuation capabilities through in situ growth,selfreduction,and multi-heterogeneous interface *** hierarchical structure features a three-dimensional carbon framework,where magnetic nanoparticles grow in situ on the carbon skeleton,creating a necklace-like ***,magnetic nanosheets assemble within this *** impedance matching was achieved by precisely adjusting component proportions,and intelligent integration of diverse interfaces bolstered dielectric *** obtain Fe_(3)O_(4)-Fe nanoparticles/carbon nanofibers/Al-Fe_(3)O_(4)-Fe nanosheets composites demonstrated outstanding performance with a minimum reflection loss(RLmin)value of−59.3 dB and an effective absorption bandwidth(RL≤−10 dB)extending up to 5.6 GHz at 2.2 *** notable accomplishments offer fresh insights into the precision design of high-efficient electromagnetic wave absorption materials.

关键词： Electromagnetic wave absorption Hierarchical structure In situ growth Self-reduction

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Self-healing superhydrophobic polyvinylidene fluoride/ Fe3O4@polypyrrole fiber with core-sheath structures for superior microwave absorption

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Nano Research 2016年第7期9卷 2034-2045页

作者： Yunan Li Yong Zhao xianyong lu Ying Zhu Lei Jiang Key Laboratory of Bio-inspired Smart Interracial Science and Technology of Ministry of Education School of Chemistry and Environment Beihang University Beijing 100191China Laboratory of Bio-inspired Smart Interracial Science Technology Institute of Physics and Chemistry Chinese Academy of Science Beijing 100190 China

Self-healing superhydrophobic polyvinylidene fluoride/Fe3O4@polypyrrole （F- PVDF/FeBO4@PPyx） fibers with core-sheath structure were successfully fabricated by electrospinning of a PVDF/Fe3O4 mixture and in situ chemical oxidative polymerization of pyrrole, followed by chemical vapor deposition with fluoroalkyl silane. The F-PVDF/Fe3O4@PPy0.075 fiber film produces a superhydrophobic surface with self-healing behavior, which can repetitively and automatically restore superhydrophobicity when the surface is chemically damaged. Moreover, the maximum refection loss （Ru） of the F-PVDF/Fe304@PPy0.075 fiber film reaches -21.5 dB at 16.8 GHz and the RL below -10 dB is in the frequency range of 10.6-16.5 GHz with a thickness of 2.5 mm. The microwave absorption performance is attributed to the synergetic effect between dielectric loss and magnetic loss originating from PPy, PVDF and Fe3O4. As a consequence, preparing such F-PVDF/Fe3O4@PPyx fibers in this manner provides a simple and effective route to develop multi-functional microwave absorbing materials for practical applications.

关键词： self-healing superhydrophobicity core-sheath structure microwave absorption

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In situ fastening graphene sheets into a polyurethane sponge for the highly efficient continuous cleanup of oil spills

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Nano Research 2017年第5期10卷 1756-1766页

作者： Zhuang Kong Jinrong Wang xianyong lu Ying Zhu Lei Jiang Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry and Environment Beihang University Beijing 100191 China Laboratory of Bio-inspired Smart Interfacial Science Technology Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China

Oil sorbents are an attractive option for oil-spill cleanup as they may be used for collection and complete removal of oil without adversely affecting the environment. However, traditional oil sorbents exhibit low oil/water separation efficiency and/or low oil-sorption capacity. In this study, an ultra-high performance graphene/polyurethane （PU） sponge has been successfully obtained by in situ polymerization in the presence of graphene dispersed in N-methylpyrrolidone （NMP）. During polymerization, the NMP/graphene dispersion not only serves as a weak amine catalyst for the formation of the sponge, but promotes fixation of the graphene sheets in the framework of the PU sponge owing to the strong dipole interaction between NMP and graphene. The as-prepared graphene/PU sponge was used as an absorbing material for the continuous removal of oil from oil-spill water. The graphene/PU sponge can continuously and rapidly remove oils from immiscible oil/water mixtures in corrosive solutions, including strong acids and bases, hot water, and ice water, with an excellent separation efficiency of above 99.99%. In addition, the as-prepared graphene/PU sponge was effective in separating surfactant-stabilized emulsions with a high separation efficiency of 〉99.91%.

关键词： graphene/polyurethane(PU) sponge in-situ polymerization continuous oil cleanup ultrahigh stability

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随心而变——多响应超疏水智能致动材料

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大学化学 2024年第5期39卷 228-237页

作者：苏玺元胡震临樊烨刘先渊鹿现永北京航空航天大学化学学院北京102206

智能致动器具有将外界刺激转化为机械运动的能力,在软体机器人、人造肌肉、传感器、智能皮肤等领域具有广阔的应用前景。本新创实验通过在聚酰亚胺高分子膜表面涂覆聚二甲基硅氧烷预聚体,并喷涂石墨烯乙醇分散液,制备出一种可以利用高... 详细信息

智能致动器具有将外界刺激转化为机械运动的能力,在软体机器人、人造肌肉、传感器、智能皮肤等领域具有广阔的应用前景。本新创实验通过在聚酰亚胺高分子膜表面涂覆聚二甲基硅氧烷预聚体,并喷涂石墨烯乙醇分散液,制备出一种可以利用高分子材料的热膨胀系数差异对光、电、热等刺激产生响应的超疏水智能材料。从中国传统剪纸艺术和仿生结构获得灵感,将所得超疏水材料加工成爪形构造和可变形集水装置,利用材料的超疏水性质实现其在强酸,强碱等复杂应用环境下的稳定运行。此外,通过调整刺激电流大小实现了材料致动能力的智能化编程,进一步提升了新创实验的可控性和应用性。本新创实验融汇无机化学、高分子化学、仪器分析和材料化学等多个化学学科,实现理论与应用的巧妙衔接。所选用的实验原料无毒且易得,符合绿色化学的要求,体现了实验的可持续性。通过开发新型材料的制备技术,有效提升了材料的致动性能,极大地拓展了材料的应用场景。该新创实验现象明显,操作过程趣味性强,有助于激发学生的科研兴趣,提高学生的知识应用水平,培养学生的创新意识,同时提升学生的综合素质。该实验对学生的学习和成长具有积极的促进作用。

关键词：智能材料高分子膜超疏水多响应

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One-pot synthesis of PVP-coated Ni_(0.6)Fe_(2.4)O_4 nanocrystals

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Chinese Science Bulletin 2010年第30期55卷 3472-3478页

作者： lu xianyong NIU Mu YANG ChunHui YI luoXin QIAO RuiRui DU MeiHong GAO MingYuan Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China School of Chemistry and Environment Beijing University of Aeronautics and Astronautics Beijing 100191 China Beijing Center for Physical and Chemical Analysis Beijing 100089 China

Novel poly(N-vinyl-2-pyrrolidone) (PVP)-coated nickel ferrite nanocrystals were prepared by simultaneously pyrolyzing nickel(Ⅱ) acetylacetonate (Ni(acac)2) and iron(Ⅲ) acetylacetonate (Fe(acac)3) in N-vinyl-2-pyrrolidone (NVP). The PVP coating was formed in situ through polymerization of NVP. The crystalline structure of the resultant nickel ferrite was analyzed by high-resolution transmission electron microscopy,electron diffraction patterns,and powder X-ray diffraction. In addition,the valence state of Ni and the metal contents of Ni and Fe in different valence states were analyzed by X-ray photoelectron spectroscopy (XPS),atomic absorption and the phenanthroline method. The surface coating layer of PVP and its binding states were characterized by Fourier transform infrared spectroscopy in combination with XPS. Colloidal stability experiments revealed that the nanocrystals could be dispersed well in both phosphate-buffered saline and Dulbecco's Modified Eagle Medium.

关键词：聚乙烯吡咯烷酮高分辨透射电子显微镜纳米涂层 X射线光电子能谱粉末X射线衍射傅里叶变换红外光谱镍铁氧体合成

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Metal-free porous nitrogen-doped carbon nanotubes for enhanced oxygen reduction and evolution reactions

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Science Bulletin 2016年第11期61卷 889-896页

作者： Ting Pan Hongying Liu Guangyuan Ren Yunan Li xianyong lu Ying Zhu School of Chemistry and Environment Engineering China University of Mining and Technology (Beijing) Beijing 100083 China Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry andEnvironment.Beihang University Beijing 100191 China School of Chemistry Biology and Material Science East ChinaUniversity of Technology Nanchang 330013 China

Developing efficient metal-free bi-functional electrocatalysts is required to reduce costs and improve the slow oxygen reduction reaction （ORR） and oxygen evo- lution reaction （OER） kinetics in electrochemical systems. Porous N-doped carbon nanotubes （NCNTs） were fabri- cated by KOH activation and pyrolysis of polypyrrole nanotubes. The NCNTs possessed a large surface area of more than 1,000 m2 g-1. NCNT electrocatalysts, particu- larly those annealed at 900 ℃, exhibited excellent ORR electrocatalytic performance. Specifically, they yielded a more positive onset potential, higher current density, and long-term operation stability in alkaline media, when compared with a commercially available 20 wt% Pt/C catalyst. This resulted from the synergetic effect between the dominant pyridinic/graphitic-N species and the porous tube structures. The NCNT electrocatalyst also exhibited good performance for the OER. The metal-free porous nitrogen-doped carbon nanomaterials were prepared from low cost and environmentally friendly precursors. They are potential alternatives to Pt/C catalysts, for electrochemical energy conversion and storage.

关键词： N-doped porous carbon Polypyrrole Electrocatalyst Oxygen reduction reaction Oxygenevolution reaction

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Clinical Value of Hepatoma-Specific Alpha-Fetoprotein in the Diagnosis of Hepatocellular Carcinoma

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Chinese Journal of Clinical Oncology 2006年第3期3卷 153-157页

作者： Runzhou Ni Mingbing Xiao Fei Jin Cuihua lu Jiefei Huang xianyong Meng Department of Gastroenterology Affiliated Hospital of Nantong University Nantong 226001 Jiangsu Province China.

OBJECTIVE To study the clinical value of hepatoma-specific alpha-feto- protein (HS-AFP) in the diagnosis and differential diagnosis of hepato- cellular carcinoma (HCC). METHODS A method of vertical slab polyacrylamide gel electrophoresis with discontinuous buffer system was developed to separate AFP sub- types. After separation, the AFP subtypes were transferred to nitrocellu- lose and reacted first with rabbit anti-human AFP and then with goat an- ti-rabbit IgG -HRP. Finally, AFP subtypes were visualized by reacting with 3,3’-diaminobenzidine tetrahydrochloride. A HS-AFP band was de- termined in 82 cases with HCC and 95 cases with benign liver diseases. The correlations between the positive rates of HS-AFP and serum AFP concentration, tumor size as well as portal vein metastasis were analyzed. RESULTS Serum AFP in the cases with various liver diseases was sepa- rated into one to several bands. The fastest band on electrophoresis (F- AFP) was found in all patients, while the band at the cathodal site (HS- AFP) was detected predominantly in HCC but rarely in benign liver dis- eases. The positive rate of HS-AFP in HCC was 74.4%, which was sig- nificantly higher than that in benign liver diseases (9.1%, 7.3% and 10.0% in liver cirrhosis, chronic hepatitis and acute hepatitis respectively). HS- AFP was detected in 3 out of 9 HCC cases with AFPluSION HS-AFP increases the sensitivity of diagnosing HCC in patients with negative AFP, and is useful in distinguishing high AFP due to HCC from that caused by benign liver diseases.

关键词： hepatoma alpha-fetoprotein heterogeneity diagnosis.

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Transient Voltage Support Strategy of Grid-forming Medium Voltage Photovoltaic Converter in the LCC-HVDC System

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 1849-1864页

作者： Hong lu xianyong Xiao Guangfu Tang Zhiyuan He Zhiguang Lin Chong Gao Zixuan Zheng College of Electrical Engineering Sichuan UniversityChengdu 610065China State Key Lab of Advance Power Transmission Technology China Electric Power Research InstituteBeijing 100192China College of Electrical Engineering Sichuan UniversityChengdu 610065China.

The participation of photovoltaic(PV)plants in supporting the transient voltage caused by commutation failure in the line-commutated-converter-based high voltage direct current(LCC-HVDC)system is of great significance,as it can enhance the DC transmission ***,it is found that the gridfollowing(GFL)PV converters face the problem of mismatch between reactive power response and transient voltage characteristic when the voltage converts from low voltage to overvoltage,further aggravating the overvoltage ***,this article proposes a transient voltage support strategy based on the gridforming(GFM)medium voltage PV *** proposed strategy takes the advantage of the close equivalent electrical distance between the converter and grid,which can autonomously control the converter terminal voltage through GFM control with adaptive voltage droop *** simulation results show that the proposed strategy can ensure the output reactive power of the PV converter quickly matches the transient voltage characteristic at different stages,indicating that the proposed strategy can effectively support the transient voltage.

关键词： Commutation failure grid-forming(GFM) photovoltaic(PV)converter reactive power response transient voltage

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复配体系非离子表面活性剂定性方法研究

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精细石油化工 2018年第1期35卷 22-25页

作者：卢先勇福建省测试技术研究所福建福州350003

用C18吸附剂和11种不同洗脱能力的洗脱剂,采用pH试纸、目测、红外光谱等方法,研究了结构、极性和相对分子质量相似的5种非离子表面活性剂的11种洗脱物。实验结果表明:每种表面活性剂的11种洗脱物其pH值、洗出量、主成分参数构成一组特... 详细信息

用C18吸附剂和11种不同洗脱能力的洗脱剂,采用pH试纸、目测、红外光谱等方法,研究了结构、极性和相对分子质量相似的5种非离子表面活性剂的11种洗脱物。实验结果表明:每种表面活性剂的11种洗脱物其pH值、洗出量、主成分参数构成一组特征性很强的数据,依据这些数据,可以方便地进行复杂体系中非离子表面活性剂的定性分析,有效提高分析效率。方法可准确定性出混合表面活性剂体系中5种结构相似的表面活性剂。同时,也适用于其他复配体系中非离子表面活性剂的定性分析,为复杂体系非离子表面活性剂定性分析提供了一种价廉、方便的方法。

关键词：复配非表面活性剂分离鉴定红外光谱

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美国大学实验室安全管理对我国建设安全“双一流”实验室的启示——以密西根大学安娜堡分校为例

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实验技术与管理 2020年第9期37卷 306-310页

作者：鹿现永北京航空航天大学化学学院北京100191

安全"双一流"高校实验室是中国一流大学和一流学科建设的重要内容。该文以美国密西根大学安娜堡分校实验室安全建设为例,从实验室管理的标准、层级管理制度,以及危险品管理等分析出发,同时结合我国高校实验室管理的现状,为建设安全"双一... 详细信息

安全"双一流"高校实验室是中国一流大学和一流学科建设的重要内容。该文以美国密西根大学安娜堡分校实验室安全建设为例,从实验室管理的标准、层级管理制度,以及危险品管理等分析出发,同时结合我国高校实验室管理的现状,为建设安全"双一流"高校实验室提供借鉴。

关键词：实验室安全双一流建设管理制度

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