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Interface-modulated approach toward multilevel metal oxide nanotubes for lithium-ion batteries and oxygen reduction reaction

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Nano Research 2016年第8期9卷 2445-2457页

作者： Jiashen Meng Chaojiang Niu Xiong Liu ziang Liu Hongliang chen Xuanpeng Wang Jiantao Li Wei chen Xuefeng Guo Liqiang Mai State Key Laboratory of Advcrnced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Center for Nanochemistry Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Metal oxide hollow structures with multilevel interiors are of great interest for potential applications such as catalysis, chemical sensing, drug delivery, and energy storage. However, the controlled synthesis of multilevel nanotubes remains a great challenge. Here we develop a facile interface-modulated approach toward the synthesis of complex metal oxide multilevel nanotubes with tunable interior structures through electrospinning followed by controlled heat treatment. This versatile strategy can be effectively applied to fabricate wire-in-tube and tube- in-tube nanotubes of various metal oxides. These multilevel nanotubes possess a large specific surface area, fast mass transport, good strain accommodation, and high packing density, which are advantageous for lithium-ion batteries （LIBs） and the oxygen reduction reaction （ORR）. Specifically, shrinkable CoMn204 tube-in-tube nanotubes as a lithium-ion battery anode deliver a high discharge capacity of -565 mAh-g-1 at a high rate of 2 A.g-~, maintaining 89% of the latter after 500 cycles. Further, as an oxygen reduction reaction catalyst, these nanotubes also exhibit excellent stability with about 92% current retention after 30,000 s, which is higher than that of commercial Pt/C （81%）. Therefore, this feasible method may push the rapid development of one-dimensional （1D） nanomaterials. These multifunctional nanotubes have great potential in many frontier fields.

关键词： interface-modulatedapproach multilevel nanotubes metal oxide lithium-ion battery (LIB~ ~ oxygen reduction reaction(ORR)

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Coherent Streamline Generation for 2-D Vector Fields

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Tsinghua Science and Technology 2012年第4期17卷 463-470页

作者： ziang Ding Xin Zhang Wei chen Xavier Tricoche Dichao Peng Qunsheng Peng Department of Computer Science Purdue UniversityWest LafayetteIN 47906USA State Key Lab of CAD&CG Zhejiang UniversityHangzhou 310000China

Visualizing 2-D vector fields using streamlines is one popular flow visualization technique. Standard streamline generation algorithms compute the density of streamlines across the domain, detect features, and employ customized rules to emphasize features. In this process, feature characterization and visual clarity are heavily considered. Simultaneously preserving the temporal coherence for time-varying vector fields, however remains a challenge. In this paper, we present a coherent and feature-aware streamline generation algorithm by employing a feature-guided streamline seeding technique and a coherent streamline placing scheme. For each frame, a feature map is first computed with critical points or the Finite-Time Lyapunov Exponent （FTLE） approach, and is used to initialize a set of seeds by leveraging the Poisson Disk distribution. These seeds are further optimized by using a deformation-driven moving mesh method. To preserve the temporal coherence, the streamlines generated from the seeds are individually checked subject to their correspondences to the ones in the previous frame. Subsequently, additional streamlines are sequentially inserted in low-density regions. We demonstrate our algorithm on both Computation Fluid Dynamics （CFD） and non-CFD datasets, and compare it with the recent literature

关键词： streamline flow visualization moving mesh spatio-temporal

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Novel hollow Ni0.33Co0.67Se nanoprisms for high capacity lithium storage

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Nano Research 2019年第6期12卷 1371-1374页

作者： Shaohua Zhu cheng chen Pan He Shuangshuang Tan Fangyu Xiong ziang Liu Zhuo Peng Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

In this work,homogeneous Ni0.33Co0.67Se hollow nanoprisms were synthesized successfully in virtue of Kirkendall *** is the first time for bimetallic Ni-Co compounds Ni0.33Co0.67Se to be used in lithium-ion batteries (LIBs).Impressively,the Ni0.33Co0.67Se hollow nanoprisms show superior specific capacity (1,575 mAh/g at the current density of 100 mA/g) and outstanding rate performance (850 mAh/g at 2,000 mA/g) as anode material for *** work proves the potential of bimetallic chalcogenide compounds as high performance anode materials for LIBs.

关键词： Ni0.33Co0.87Se hollow nanoprisms anodehigh capacity lithium-ion batteries

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Silver nanocubes monolayers as a SERS substrate for quantitative analysis

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Chinese Chemical Letters 2021年第4期32卷 1497-1501页

作者： ziang Zhou Xiuhui Bai Peishen Li Changzheng Wang Ming Guo Yang Zhang Peiren Ding Shaowei chen Yunyun Wu Qiang Wang Laboratory for Micro-sized Functional Materials College of Elementary Education and Department of ChemistryCapital Normal UniversityBeijing 100048China School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation Beijing University of Civil Engineering and ArchitectureBeijing 100044China College of Chemistry Beijing Normal UniversityBeijing 100875China Department of Chemistry and Biochemistry University of CaliforniaSanta CruzUnited States

Surface-enhanced Raman scattering(SERS)is a powerful spectroscopic tool in quantitative analysis of molecules,where the substrate plays a critical role in determining the detection ***,a silver nanocubes/polyelectrolyte/gold film sandwich structure was prepared as a reproducible,highperformance SERS substrate by the wate r/oil inte rfacial assembly *** addition to the hot spots on the nanocubes surface,the edge-to-edge interspace of the Ag nanocubes led to marked enhancement of the SERS intensity,with a limit of detection of 10~(11)mol/L and limit of quantitation of 10~(10)mol/L for crystal *** rhodamine 6 G and crystal violet were co-adsorbed on the Ag nanocube surfaces,the characteristic SERS peaks of the two molecules remained well resolved and separated,and the peak intensities varied with the respective concentration,which could be exploited for concurrent detection of dual *** from this work indicate that organized ensembles of Ag nanocubes can serve as effective SERS substrate can for sensitive analysis for complex molecular systems.

关键词： Silver nanocube Surface enhanced raman scattering Quantitative analysis Rhodamine 6G Crystal violet

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铁基氟化物锂电池正极材料研究进展

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稀有金属 2022年第6期46卷 724-735页

作者：姜子昂王宇杰陈轩锋罗顺睿吴飞翔中南大学冶金与环境学院湖南长沙410083

随着新能源技术不断地发展,目前商业应用的锂离子电池正极材料面临能量密度低、成本高等诸多挑战,因此转换型正极相对于传统插层型正极材料具有多电子反应的储能优势受到了广泛关注,其中氟化铁(FeF3)和氟化亚铁(FeF2)等铁基氟化物由于... 详细信息

随着新能源技术不断地发展,目前商业应用的锂离子电池正极材料面临能量密度低、成本高等诸多挑战,因此转换型正极相对于传统插层型正极材料具有多电子反应的储能优势受到了广泛关注,其中氟化铁(FeF3)和氟化亚铁(FeF2)等铁基氟化物由于其高能量密度和低成本的特点,被认为是极有潜力的锂电池正极材料。然而铁基氟化物正极材料存在导电性差、反应动力学缓慢以及活性物质溶解等科学难题,导致了电压滞后、倍率性能和循环性能差等问题,难以满足实际应用的要求。从铁基氟化物结构设计、复合改性及电解液设计对其影响等方面,总结铁基氟化物正极材料的研究进展,分析了电化学性能改善的原因,展望未来铁基氟化物正极材料的发展方向。

关键词：铁基氟化物锂离子电池正极材料转换反应

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流体活动属性在煤层含气性识别中的应用

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地质论评 2023年第S1期69卷 505-506页

作者：王子昂黄亚平陈炳心中国矿业大学资源与地球科学学院江苏徐州221116

煤层气又称煤层甲烷、煤层瓦斯,是保留在定深度煤层内的煤成气。根据国际能源署的统计资料显示,全球埋深浅于2000 m的煤层气资源约为240~270万亿m^(3),是常规天然气探明储量的两倍多。我国煤炭煤层气资源丰富,煤与煤层气具有协同开发的... 详细信息

煤层气又称煤层甲烷、煤层瓦斯,是保留在定深度煤层内的煤成气。根据国际能源署的统计资料显示,全球埋深浅于2000 m的煤层气资源约为240~270万亿m^(3),是常规天然气探明储量的两倍多。我国煤炭煤层气资源丰富,煤与煤层气具有协同开发的资源基础和优势。在碳减排进程中,煤炭仍然是我国支撑能源、兜底能源和重要工业原料.

关键词：煤层气流体活动属性含气性

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Climatic response of Pinus sylvestris var. mongolica tree-ring width and precipitation reconstruction for the northern Greater Higgnan Mountains, China, since 1720

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Research in Cold and Arid Regions 2014年第6期6卷 546-555页

作者： TongWen Zhang YuJiang Yuan WenShou Wei RuiBo Zhang ShuLong Yu Feng chen HuaMing Shang Li Qin ziang Fan Institute of Desert Meteorology China Meteorological Administration Key Laboratory of Tree-ring Physical and Chemical Research of China Meteorological Administration Key Laboratory of Tree-ring Ecology of Uighur Autonomous Region

August-June precipitation has been reconstructed back to AD 1720 for the northern Greater Higgnan Mountains, China, by use ofPinus sylvestris var. mongolica tree-ring width. The reconstruction explains the variance of 39% in observed precipitation from 1973 to 2008. Some extremely dry/wet signals in historical documents and other precipitation reconstructions in previous studies are precisely captured in our reconstruction. Wet periods occurred during the periods of 1730 to 1746, 1789 to 1812, 1844 to 1903, 1920 to 1930, 1942 to 1961, and 1985 to 1998; while periods of 1747 to 1788, 1813 to 1843, 1904 to 1919, 1931 to 1941, and 1962 to 1984 were relatively dry. Power spectral and wavelet analyses demon- strated the existence of significant 24-year, 12-year, and 2-year cycles of variability.

关键词： Greater Higgnan Mountains Pinus sylvestris var. mongolica tree-ring width precipitation reconstruction

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Engineering of dendritic dopant-free hole transport molecules:enabling ultrahigh fill factor in perovskite solar cells with optimized dendron construction

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Science China Chemistry 2021年第1期64卷 41-51页

作者： Wei chen Yang Wang Bin Liu Yajun Gao ziang Wu Yongqiang Shi Yumin Tang Kun Yang Yujie Zhang Weipeng Sun Xiyuan Feng Frédéric Laquai Han Young Woo Aleksandra B.Djurisic Xugang Guo Zhubing He Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics The University of Hong KongPokfulamHong KongChina King Abdullah University of Science and Technology KAUST Solar CenterPhysical Sciences and Engineering DivisionMaterial Science and Engineering ProgramThuwal 23955-6900Kingdom of Saudi Arabia Department of Chemistry Korea UniversitySeoul 02841South Korea

Developing dopant-free hole-transporting materials(HTMs)for high-performance perovskite solar cells(PVSCs)has been a very active research topic in recent years since HTMs play a critical role in optimizing interfacial charge carrier kinetics and in turn determining device ***,a novel dendritic engineering strategy is first utilized to design HTMs with a D-A type molecular framework,and diphenylamine and/or carbazole is selected as the building block for constructing *** HTMs show good thermal stability and excellent film morphology,and the key optoelectronic properties could be fine-tuned by varying the dendron *** them,MPA-Cz-BTI and MCz-Cz-BTI exhibit an improved interfacial contact with the perovskite active layer,and non-radiative recombination loss and charge transport loss can be effectively ***,high power conversion efficiencies(PCEs)of 20.8%and 21.35%are achieved for MPA-Cz-BTI and MCz-Cz-BTI based devices,respectively,accompanied by excellent long-term storage *** encouragingly,ultrahigh fill factors of 85.2%and 83.5%are recorded for both devices,which are among the highest values reported to *** work demonstrates the great potential of dendritic materials as a new type of dopant-free HTMs for high-performance PVSCs with excellent FF.

关键词： dendritic molecules hole-transporting materials dopant-free ultrahigh fill factor perovskite solar cells

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转录因子Bach2在慢性感染引起的耗竭性T细胞分化中的机制研究

转录因子Bach2在慢性感染引起的耗竭性T细胞分化中的机制研究

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第十四届全国免疫学学术大会

作者：楼国华 Yao chen ziang Zhu Tuoqi Wu 浙江大学医学院附属第一医院 UT Southwestern Medical Center Colorado Unversity

背景:在慢性感染或肿瘤中经常会发生T细胞耗竭,其主要表现为自我更新减弱,细胞因子分泌减少,二次响应能力不足,以及细胞表面免疫抑制类受体高表达,是目前影响T细胞免疫疗效的关键,但是对于其分化的机制却了解不够清楚。研究方法:利用小... 详细信息

背景:在慢性感染或肿瘤中经常会发生T细胞耗竭,其主要表现为自我更新减弱,细胞因子分泌减少,二次响应能力不足,以及细胞表面免疫抑制类受体高表达,是目前影响T细胞免疫疗效的关键,但是对于其分化的机制却了解不够清楚。研究方法:利用小鼠的淋巴细胞性脉络膜脑膜炎病毒(LCMV)模型,通过流式分选对慢性感染早期出现的耗竭性T前体细胞和终末端分化细胞的RNA-Seq,ATAC-Seq和H3K27Ac ChIPSeq分析,研究不同群细胞间差异表达基因。通过生信筛选差异显著基因,再结合原代T细胞体外基因过表达、CRISPR介导的敲除和过继免疫实验验证差异基因在慢性感染中与T细胞耗竭分化的相关性。结果:发现Bach2在前体细胞中高表达,而其针对的DNA结合域在终末端则呈开放状态。进一步的Bach2敲除或过表达后单细胞测实验则证明了BACH2过表达的细胞富集了类干性前体细胞的基因,如Tcf7,Sell,Id3和Slamf6等。而CRISPR介导的BACH2缺失着会导致T细胞脱离类干性状态,其中如Lilrb4a,Id2,Gzmb,Havcr2,Prdm1,Klrg1等终末端效应T细胞相关的分子则出现富集。而通过不同组织的病理切片分析则发现Bach2的过表达会导致过继的T细胞在脾脏等免疫器官中更加富集,而在受到感染的非淋巴系外周器官(肝脏、肺)中相应减少。结论:Bach2的过表达促进了长期存活的TCF-1前体细胞的分化,但是对于T细胞的组织分布以及效应性有所影响。对于Bach2功能的探索不仅丰富了对慢性感染期间耗竭性T前体细胞的转录和表观遗传的理解,而且为开发新的基于T细胞的免疫疗法提供了新靶点。

关键词： T细胞耗竭 Bach2 LCMV

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淬火裂纹导致的阀门损伤研究

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核动力工程 2015年第S1期36卷 177-179页

作者：何子昂陈树姜圣翰尹开锯陈勇中国核动力研究设计院成都610213 电子科技大学微电子与固体电子学院成都610054

对裂纹损伤的阀门开展化学成分分析、扫描电子显微镜(SEM)分析、断口裂纹分析及洛氏硬度分析,得出以下结论:阀门材料的化学成分和洛氏硬度均满足设计要求,阀芯裂纹是由于材料中碳化物的大小及分布不均匀所产生的带状偏析现象造成的淬火... 详细信息

对裂纹损伤的阀门开展化学成分分析、扫描电子显微镜(SEM)分析、断口裂纹分析及洛氏硬度分析,得出以下结论:阀门材料的化学成分和洛氏硬度均满足设计要求,阀芯裂纹是由于材料中碳化物的大小及分布不均匀所产生的带状偏析现象造成的淬火裂纹,其现象产生于锻轧过程。

关键词：淬火裂纹阀门损伤断口分析

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