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Friction 2024年第7期12卷 1564-1579页

作者： linlin duan Dan JIA Jian LI Jianfang LIU Haitao duan State Key Laboratory of Special Surface Protection Materials and Application Technology Wuhan Research Institute of Materials ProtectionWuhan 430030China Hubei Longzhong Laboratory Xiangyang 441000China College of Life Science and Technology Wuhan Polytechnic UniversityWuhan 430030China

In this work,the advantage of Coulomb repulsion in the intermolecular forces experienced by molecules on the solid–liquid nanosized contact interface is taken,and the superior friction-reducing property of Cu_(3)(PO_(4))2·3H_(2)O(CuP)oil-based additives has been confirmed for titanium alloy.Three-dimensional(3D)CuP nanoflowers(CuP-Fs)with a strong capillary absorption effect are prepared to achieve the homogeneous mixing of solid CuP and lubricating oil.Lubrication by CuP-Fs additives for titanium alloy,friction coefficient(COF)can be reduced by 73.68%,and wear rate(WR)reduced by 99.69%.It is demonstrated that the extraordinary friction-reducing property is due to the repulsive solid–liquid interface with low viscous shear force originating from Coulomb repulsion between polar water molecules in CuP and non-polar oil molecules.However,any steric hindrance or connection between this repulsive solid–liquid interface will trigger the adhesion and increase the viscous shear force,for example,dispersant,hydrogen bondings,and shaky adsorbed water molecules.Besides,the lamellar thickness of CuP and the molecular size of lubricant both have a great influence on tribological properties.Here the lubrication mechanism based on interface Coulomb repulsion is proposed that may help broaden the scope of the exploration in low-friction nanomaterial design and new lubricant systems.

关键词： lubrication nanomaterial additive solid-liquid interface wear

Micelle-directed self-assembly of single-crystal-like mesoporous stoichiometric oxides for high-performance lithium storage

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National Science Review 2024年第4期11卷 195-205页

作者： Yanhua Wan Changyao Wang Xingmiao Zhang Yang Yin Mengmeng Liu Bing Ma linlin duan Yuzhu Ma Wei Zhang Changlin Zheng Dongliang Chao Fei Wang Yongyao Xia Wei Li Department of Chemistry Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers College of Chemistry and Materials ScienceFudan University State Key Laboratory of Surface Physics and Department of Physics Fudan University

Due to their uncontrollable assembly and crystallization process,the synthesis of mesoporous metal oxide single crystals remains a formidable challenge.Herein,we report the synthesis of single-crystal-like mesoporous Li2TiSiO5by using soft micelles as templates.The key lies in the atomic-scale self-assembly and step-crystallization processes,which ensure the formation of single-crystal-like mesoporous Li2TiSiO5microparticles via an oriented attachment growth mechanism under the confinement of an in-situ formed carbon matrix.The mesoporous Li2TiSiO5anode achieves a superior rate capability(148 mAh g-1at5.0 A g-1) and outstanding long-term cycling stability(138 mAh g-1after 3000 cycles at 2.0 A g-1) for lithium storage as a result of the ultrafast Li+diffusion caused by penetrating mesochannels and nanosized crystal frameworks（5-10 nm）.In comparison,bulk Li2TiSiO5exhibits poor rate capability and cycle performance due to micron-scale diffusion lengths.This method is very simple and reproducible,heralding a new way of designing and synthesizing mesoporous single crystals with controllable frameworks and chemical functionalities.

关键词： mesoporous materials micelles single-crystal-like Li2TiSiO5 lithium-ion batteries

Nanomaterials for lubricating oil application:A review

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Friction 2023年第5期11卷 647-684页

作者： linlin duan Jian LI Haitao duan State Key Laboratory of Special Surface Protection Materials and Application Technology Wuhan Research Institute of Materials ProtectionWuhan 430030China

Friction and wear are ubiquitous,from nano-electro-mechanical systems in biomedicine to large-scale integrated electric propulsion in aircraft carriers.Applications of nanomaterials as lubricating oil additives have achieved great advances,which are of great significance to control friction and wear.This review focuses on the applications of nanomaterials in lubricating oil and comprehensively compares their tribological characteristics as lubricating oil additives.Statistical analysis of tribology data is provided and discussed accordingly;moreover,the interaction between nanomaterials and sliding surface,lubricating oil,other additives,and synergistic lubrication in nanocomposites are systematically elaborated.Finally,suggestions for future research on nanomaterials as lubricating oil additives are proposed.Hence,this review will promote a better fundamental understanding of nanomaterials for lubricating oil application and help to achieve the superior design of nanoadditives with outstanding tribological performances.

关键词： nanomaterial additive friction modifier lubrication wear

Unleash electron transfer in C–H functionalization by mesoporous carbon-supported palladium interstitial catalysts

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National Science Review 2021年第4期8卷 154-166页

作者： Xiaorui Zhao Yueqiang Cao linlin duan Ruoou Yang Zheng Jiang Chao Tian Shangjun Chen Xuezhi duan De Chen Ying Wan Key Laboratory of Resource Chemistry of Ministry of Education Shanghai Key Laboratory of Rare Earth Functional MaterialsDepartment of Chemistry Shanghai Normal University State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai Synchrotron Radiation Facility Zhangjiang National Lab Shanghai Advanced Research Institute Chinese Academy of Sciences Department of Chemical Engineering Norwegian University of Science and Technology

The functionalization of otherwise unreactive C–H bonds adds a new dimension to synthetic chemistry,yielding useful molecules for a range of applications. Arylation has emerged as an increasingly viable strategy for functionalization of heteroarenes which constitute an important class of structural moieties for organic materials. However, direct bisarylation of heteroarenes to enable aryl-heteroaryl-aryl bond formation remains a formidable challenge, due to the strong coordination between heteroatom of N or S and transitional metals. Here we report Pd interstitial nanocatalysts supported on ordered mesoporous carbon as catalysts for a direct and highly efficient bisarylation method for five-membered heteroarenes that allows for green and mild reaction conditions. Notably, in the absence of any base, ligands and phase transfer agents, high activity(turn-over frequency, TOF, up to 107 h-1) and selectivity(>99%) for the2,5-bisarylation of five-membered heteroarenes are achieved in water. A combination of characterization reveals that the remarkable catalytic reactivity here is attributable to the parallel adsorption of heteroarene over Pd clusters, which breaks the barrier to electron transfer in traditional homogenous catalysis and creates dual electrophilic sites for aryl radicals and adsorbate at C2 and C5 positions. The d-band filling at Pd sites shows a linear relationship with activation entropy and catalytic activity. The ordered mesopores facilitate the absence of a mass transfer effect. These findings suggest alternative synthesis pathways for the design, synthesis and understanding of a large number of organic chemicals by ordered mesoporous carbon supported palladium catalysts.

关键词： palladium interstitial catalyst ordered mesoporous carbon direct bisarylation multi-site electron transfer d-charge gain

Material dependence of cities and implications for regional sustainability

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Regional Sustainability 2020年第1期1卷 31-36页

作者： Yupeng Liu Jiajia Li linlin duan Min Dai Wei-qiang Chen Key Lab of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen361021China Xiamen Key Lab of Urban Metabolism Xiamen361021China University of Chinese Academy of Sciences Beijing100049China Fudan Tyndall Center Department of Environmental Science&EngineeringFudan UniversityShanghai200438China

Cities rely on massive amounts of physical,chemical,and biological resources to support their growth and metabolism.These‘metabolic inputs’are accumulated in cities to form material stocks in buildings,infrastructures,transportation facilities,and household appliances.This study takes China’s urbanization as an example to illustrate the characteristics of material stock changes in developing countries and compare them with those in developed countries.Results show that(1)material stocks have been growing in China,but have saturated in developed countries,and(2)the major components of urban metabolism are construction and industrial materials(e.g.,steel)in developing countries but biomass(e.g.,food)in developed countries.The changes in the magnitude and types of material stocks can not only measure urban development but also directly link city and its residents,offering advantages in representing urbanization over the existing indices such as population,land use,or gross domestic product(GDP).Given the new insights provided by material stock,we recommend to embrace it as a critical index of urbanization for guiding urban planning and policy-making.

关键词： Urbanization Urban metabolism Material stock Land use/cover changes Economic transition Sustainability Industrial ecology

Controllable synthesis of highly crystallized mesoporous TiO2/WO3 heterojunctions for acetone gas sensing

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Chinese Chemical Letters 2020年第5期31卷 1119-1123页

作者： Changyao Wang Yuhui Li Pengpeng Qiu linlin duan Wei Bi Yan Chen Dingyi Guo Yupu Liu Wei Luo Yonghui Deng Laboratory of Advanced Materials Department of ChemistryShanghai Key Lab of Molecular Catalysis and Innovative MaterialsiChEM and State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInstitute of Functional MaterialsDonghua UniversityShanghai 201620China Department of Stomatology Zhongshan HospitalFudan UniversityShanghai 200032China

Mesoporous semiconducting metal oxides(SMOs)heterojunctions are appealing sensors for gas detecting.However,due to the different hydrolysis and condensation mechanism of every metal precursor and the contradiction between high crystallinity and high surface area,the synthesis of mesoporous SMOs heterojunctions with highly o rdered mesostructures,highly crystallized frameworks,and high surface area remains a huge challenge.In this work,we develop a novel"acid-base pair"adjusted solvent evaporation induced self-assembly(EISA)strategy to prepare highly crystallized ordered mesoporous TiO2/WO3(OM-TiO2/WO3)heterojunctions.The WCl6 and titanium isopropoxide(TIPO)are used as the precursors,respectively,which function as the"acid-base pair",enabling the coassembly with the structure directing agent(PEO-b-PS)into highly ordered meso structures.In addition,PEO-b-PS can be converted to rigid carbon which can protect the meso structures from collapse during the crystallization process.The resultant OM-TiO2/WO3 heterojunctions possess primitive cubic mesostructures,large pore size(~21.1 nm),highly crystalline frameworks and surface area(~98 m2/g).As a sensor for acetone,the obtained OM-TiO2/WO3 show excellent re sponse/recovery perfo rmance(3 s/5 s),good linear dependence,repeatability,selectivity,and long-term stability(35 days).

关键词： Mesoporous materials Acetone gas sensing Heterojunctions TiO2 WO3

肺炎支原体肺炎患儿血清microR-146a、sPD-L2与疾病严重程度及预后的关系研究

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国际检验医学杂志 2024年第13期45卷 1552-1557页

作者：李华风段林林张云临汾市人民医院儿科山西临汾041000

目的研究肺炎支原体肺炎(MPP)患儿血清微小RNA(miR)-146a、可溶性程序性死亡配体2(sPD-L2)水平,分析二者与MPP病情严重程度的关系及对预后的预测价值。方法选取2019年2月至2021年6月临汾市人民医院收治的89例MPP患儿,根据病情严重程... 详细信息

目的研究肺炎支原体肺炎(MPP)患儿血清微小RNA(miR)-146a、可溶性程序性死亡配体2(sPD-L2)水平,分析二者与MPP病情严重程度的关系及对预后的预测价值。方法选取2019年2月至2021年6月临汾市人民医院收治的89例MPP患儿,根据病情严重程度分为重症组(50例)和轻症组(39例)。根据MPP患儿预后分为预后良好组(70例)和预后不良组(19例)。以同期体检的50例健康儿童为对照组。采用实时荧光定量PCR检测各组血清miR-146a水平。采用酶联免疫吸附试验检测血清sPD-L2水平。采用Pearson相关性分析MPP患儿血清miR-146a与sPD-L2水平的相关性。采用Logistic回归分析影响MPP患儿预后不良的因素。采用受试者工作特征曲线分析血清miR-146a、sPD-L2对MPP患儿预后不良的预测效能。结果对照组、轻症组及重症组血清miR-146a水平依次降低(P<0.05),而sPD-L2水平依次升高(P<0.05)。MPP患儿血清miR-146a与sPD-L2水平呈负相关(r=-0.735,P<0.001)。预后不良组发热持续时间、胸腔积液比例、C反应蛋白、重症MPP患儿比例及血清sPD-L2水平均高于预后良好组(P<0.05),而血清miR-146a水平低于预后良好组(P<0.05)。重症MPP、血清sPD-L2是MPP患儿预后不良的独立危险因素,miR-146a是保护因素(P<0.05)。血清miR-146a、sPD-L2二者联合预测MPP患儿预后不良的曲线下面积为0.915(95%CI:0.861~0.949),高于miR-146a、sPD-L2单项指标预测的0.844(95%CI:0.801~0.886)和0.859(95%CI:0.814~0.897)(Z=4.780、4.023,均P<0.05)。结论 MPP患儿血清miR-146a水平降低,sPD-L2水平升高,二者与MPP疾病严重程度有关,且二者联合检测对MPP预后不良具有较高的预测价值。

关键词：肺炎支原体肺炎微小RNA-146a 可溶性程序性死亡配体2 儿童严重程度预后

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高纯钼粉的制备技术及研究进展

中国钼业 2024年第3期48卷 1-7,13页

作者：段琳琳屈航卜春阳王宇晴金堆城钼业股份有限公司技术中心陕西西安710077 陕西省“四主体一联合”先进钼化合物功能材料校企联合研究中心陕西西安710077

随着电子行业的精细化发展,高纯钼因其薄膜应力小、高温稳定性好,导电性能良好,比阻抗低广泛应用于电子行业。本文系统概述了高纯钼粉的制备技术,包括高纯钼原料(钼酸铵、MoO_(3)、MoCl_(5)、Mo(CO)_(6)、MoS_(3)等)清洁化还原分解技术... 详细信息

随着电子行业的精细化发展,高纯钼因其薄膜应力小、高温稳定性好,导电性能良好,比阻抗低广泛应用于电子行业。本文系统概述了高纯钼粉的制备技术,包括高纯钼原料(钼酸铵、MoO_(3)、MoCl_(5)、Mo(CO)_(6)、MoS_(3)等)清洁化还原分解技术和普通钼粉电子束熔炼及等离子球化提纯技术,重点讨论了沉淀法、溶剂萃取法、离子交换法、结晶法等提高钼酸铵纯度的方法,指出了不同提纯方法存在的优势与不足,并就高纯钼粉制备技术及应用前景进行了总结与讨论。

关键词：高纯钼粉三氧化钼纯度电子行业

Optical Genome Mapping for Cryptic Chromosomal Rearrangements Identification in Clinical Practice

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Maternal-Fetal Medicine 2024年第2期6卷 124-127页

作者： Chunxiang Zhou Honglei duan linlin He Huijun Li Yiyan Shi Jie Li Obstetrics and Gynecology Medical Center Nanjing University Medical School Affiliated Nanjing Drum Tower HospitalNanjing 210008China

To editor:Balanced chromosomal rearrangements(BCRs),predominantly reciprocal translocations and inversions represent disease-related structural variations(SVs)that directly disrupt gene structure and function.Moreover,BCRs predispose offspring to unbalanced rearrangements,resulting in adverse pregnancy outcomes.1 The timely and accurate identification of carriers is crucial for minimizing the risk of associated adverse pregnancy outcomes,assessing recurrent risk,and planning appropriate management.Conventional cytogenetic karyotyping serves as the standard first-tier approach for BCR detection,yielding a rate of 2%–4%in the recurrent miscarriage population.2 However,its limited resolution(typically around 5–10 Mb)poses challenges in detecting cryptic BCRs with smaller or similarly banded segments,as well as complex SVs involving multiple chromosomes.Optical genome mapping(OGM),an emerging technology from Bionano Genomics,has a high resolution for detecting nearly all types of genomic SVs and has been recognized as a revolution in next-generation cytogenomic analysis.3,4 A growing number of studies have recently demonstrated the efficiency and superiority of OGM in various clinical settings,including both prenatal and postnatal congenital conditions,as well as various hematological and other malignancies.5–7 Here,we explore the value of OGM in identifying cryptic BCRs using a case series from our clinical practice.This study was approved by the ethics committee of the Nanjing Drum Tower Hospital affiliated with Nanjing University Medical School(no.2021-464-02).

关键词： editor yielding Nanjing

数字金融对区域结构性全要素生产率的空间效应——基于我国237个城市的经验证据

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浙江社会科学 2023年第3期 15-25,156页

作者：朴哲范陈写段琳琳浙江财经大学金融学院杭州310018

本文利用DEA-Malmquist方法测算区域结构性全要素生产率,并基于我国2012—2019年237个城市的空间面板数据,利用空间杜宾模型实证检验数字金融(覆盖广度、使用深度和数字化程度)对区域结构性全要素生产率的空间效应。研究发现:数字金融... 详细信息

本文利用DEA-Malmquist方法测算区域结构性全要素生产率,并基于我国2012—2019年237个城市的空间面板数据,利用空间杜宾模型实证检验数字金融(覆盖广度、使用深度和数字化程度)对区域结构性全要素生产率的空间效应。研究发现:数字金融主要通过促进技术进步和提高规模效率有效提升区域全要素生产率;在全国范围和东中西部区域中,数字金融发展均能提升本城市的全要素生产率,而东部区域内周边城市数字金融的发展却对本城市全要素生产率起抑制作用;数字金融覆盖广度、使用深度提高均能提升我国全要素生产率整体水平,同时在东中部区域直接效应显著,在西部区域却以间接效应为主。因此,政府应积极完善数字金融基础设施建设,推进区域间差异化金融发展战略,优化产业和就业结构。

关键词：数字金融结构性全要素生产率空间效应空间杜宾模型