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Emergence of Chern Insulating States in Non-magic Angle Twisted Bilayer Graphene

Chinese Physics Letters 2021年第4期38卷 96-102页

作者： Cheng Shen jianghua Ying Le Liu jianpeng Liu Na Li Shuopei Wang jian Tang Yanchong Zhao Yanbang Chu Kenji Watanabe Takashi Taniguchi rong Yang Dongxia Shi Fanming Qu Li Lu Wei Yang Guangyu Zhang beijing National Laboratory for Condensed {1.tter Physics Key Laboratory for Nanoscale Physics and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China School of Physical Sciences and Technology ShanghaiTech UniversityShanghai 200031China Shanghai Tech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 200031China beijing Key Laboratory for Nano{1.terials and Nanodevices Beijing 100190China Songshan-Lake materials Laboratory Dongguan 523808China Research Center for Functional materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan International Center for materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan

Twisting two layers into a magic angle(ma) of ~1.1.is found essential to create low energy flat bands and the resulting correlated insulating,superconducting,and magnetic phases in twisted bilayer graphene(TBG).While most of previous works focus on revealing these emergent states in ma-TBG,a study of the twist angle dependence,which helps to map an evolution of these phases,is yet less ***,we report a magnetotransport study on one non-magic angle TBG device,whose twist angle θ changes from 1.25° at one end to 1.43°at the *** θ=1.25° we observe an emergence of topological insulating states at hole side with a sequence of Chern number |C|=4-|v|,where v is the number of electrons(holes) in moire unite *** θ> 1.25°,the Chern insulator from flat band disappears and evolves into fractal Hofstadter butterfly quantum Hall insulator where magnetic flux in one moire unite cell *** observations will stimulate further theoretical and experimental investigations on the relationship between electron interactions and non-trivial band topology.

关键词： Angle moire twist

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Discovery of a highly specific ^(1.)F-labeled PET ligand for phosphodiesterase 1.A enabled by novel spirocyclic iodonium ylide radiofluorination

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Acta Pharmaceutica Sinica B 2022年第4期12卷 1963-1975页

作者： Zhiwei Xiao Huiyi Wei Yi Xu Ahmed Haider Junjie Wei Shiyu Yuan jian {1. Chunyu Zhao Guocong Li Weibin Zhang Huangcan Chen Yuefeng Li Lingling Zhang Jiyun Sun Shaojuan Zhang Hai-Bin Luo Sen Yan Qijun Cai Lu Hou Chao Che Steven H.Liang Lu Wang Center of Cyclotron and PET Radiopharmaceuticals Department of Nuclear Medicine and PET/CT-MRI Centerthe First Affiliated Hospital of Jinan UniversityGuangzhou 510630China Division of Nuclear Medicine and Molecular Imaging Massachusetts General Hospital&Department of RadiologyHarvard Medical SchoolBostonMA 02114USA Department of Cardiology the First Affiliated Hospital of Jinan UniversityGuangzhou 510630China State Key Laboratory of Chemical Oncogenomics Key Laboratory of Chemical GenomicsPeking University Shenzhen Graduate SchoolShenzhen 518055China Guangdong Landau Biotechnology Co.Ltd. Guangzhou 510555China Key Laboratory of Tropical Biological Resources of Ministry of Education School of Pharmaceutical SciencesHainan UniversityHaikou 570228China Guangdong-Hongkong-macao {1. of CNS Regeneration Ministry of Education CNS Regeneration Collaborative Joint LaboratoryJinan UniversityGuangzhou 510632China

As a member of cyclic nucleotide phosphodiesterase(PDE)enzyme family,PDE1.A is in charge of the degradation of cyclic adenosine(cAMP)and guanosine monophosphates(cGMP).While PDE1.A is primarily expressed in the medium spiny neurons of the striatum,it has been implicated in a variety of neurological ***,inhibition of PDE1.A has proven to be of potential use for the treatment of central nervous system(CNS)pathologies caused by dysfunction of the basal ganglia–of which the striatum constitutes the largest component.A PDE1.A-targeted positron emission tomography(PET)radioligand would enable a better assessment of the pathophysiologic role of PDE1.A,as well as confirm the relationship between target occupancy and administrated dose of a given drug candidate,thus accelerating the development of effective PDE1.A *** this study,we designed and synthesized a novel ^(1.)F-aryl PDE1.A PET radioligand,codenamed[^(1.)F]P1.A-1.1.([^(1.)F]9),in high radiochemical yield and molar activity via spirocyclic iodonium ylide-mediated radiofluorination.[^(1.)F]9 possessed good in vitro binding affinity(IC_(50)=2.1.nmol/L)and selectivity towards ***,[^(1.)F]9 exhibited reasonable lipophilicity(logD=3.50)and brain permeability(P_(app)>1.×1.^(−6) cm/s in MDCK-MDR1.cells).PET imaging studies of[^(1.)F]9 revealed high striatal uptake and excellent in vivo specificity with reversible tracer *** studies in rodents revealed an improved plasma and brain stability of[^(1.)F]9 when compared to the current reference standard for PDE1.A-targeted PET,[^(1.)F]***,dose–response experiments with a series of escalating doses of PDE1.A inhibitor 1.in rhesus monkey brains confirmed the utility of[^(1.)F]9 for evaluating target occupancy in vivo in higher *** conclusion,our results indicated that[^(1.)F]9 is a promising PDE1.A PET radioligand for clinical translation.

关键词： Phosphodiesterase 1.A PET radioligand 1.F Spirocyclic iodonium ylide Nonhuman primate Target occupancy

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Total conversion of centimeter-scale nickel foam into single atom electrocatalysts with highly selective CO_(2)electrocatalytic reduction in neutral electrolyte

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Nano Research 2023年第2期16卷 2003-2010页

作者： Qikui Fan Pengfei Gao Shan Ren Yunteng Qu Chuncai Kong jian Yang Yuen Wu Ministry of Education Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an 710049China Shenzhen Key Laboratory of Special Functional materials Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Northwest institute of Nuclear Technology Xi’an 710024China institute of Functional Nano&Soft {1.terials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China State Key Laboratory of Photoelectric Technology and Functional materials International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics and Photon-TechnologyNorthwest UniversityXi’an 710069China Department of Chemistry iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026China

To improve the atomic utilization of metals and reduce the cost of industrialization,the one-step total monoatomization of {1.croscopic bulk metals,as opposed to nanoscale metals,is *** this study,we used a ther{1.l diffusion method to directly convert commercial centimeter-scale Ni foam to porous Ni single-atom-loaded carbon nanotubes(CNTs).As expected,owing to the coating of single-atom on porous,highly conductive CNT carriers,Ni single-atom electrocatalysts(Ni-SACs)exhibit extremely high activity and selectivity in CO_(2)electroreduction(CO_(2)RR),yielding a current density of>350 {1./cm^(2),a selectivity for CO of>91.under a flow cell configuration using a 1.M potassium chloride(KCl)*** on the superior activity of the Ni-SACs electrocatalyst,an integrated gas-phase electrochemical zero-gap reactor was introduced to generate a significant amount of CO current for potential practical *** overall current can be increased to 800 {1.,while {1.intaining CO Faradaic efficiencies(FEs)at above 90%per unit *** findings and insights on the active site transfor{1.tion mechanism for {1.croscopic bulk Ni foam conversion into single atoms can inform the design of highly active single-atom catalysts used in industrial CO_(2)RR systems.

关键词： Ni single atom electrocatalyst CO_(2)electroreduction to CO neutral electrolyte thermal diffusion

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祁婺高速公路边坡土壤有机碳变化初探

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公路交通科技 2022年第S2期39卷 381-386页

作者：赵森孙伯唯马建荣张东赵溦交通运输部公路科学研究院、公路交通环境保护技术交通行业重点实验室北京100088

为明确高速公路边坡土壤有机碳的变化规律,针对公路边坡生态修复区域土壤有机碳变化规律未知、难以提升土壤碳汇水平、生态修复效果良莠不齐的问题,以江西省祁婺高速公路植被恢复的边坡土壤为研究对象,通过野外边坡土壤调查、实验室理... 详细信息

为明确高速公路边坡土壤有机碳的变化规律,针对公路边坡生态修复区域土壤有机碳变化规律未知、难以提升土壤碳汇水平、生态修复效果良莠不齐的问题,以江西省祁婺高速公路植被恢复的边坡土壤为研究对象,通过野外边坡土壤调查、实验室理化性质分析,进行了因子分析等数理统计计算。调查了公路沿线不同区域土壤有机碳特征,解析了不同粒径下土壤有机碳的变化特征,识别了有机碳变化过程中土壤质量变化主要影响因素。结果表明:祁婺高速公路边坡生态修复效果好的边坡土壤的有机碳含量较高;祁婺高速公路边坡土壤粒径主要为0.05~0.01.mm粗粉粒,有利于土壤有机碳在自然演化中的富集与保存;土壤肥力是影响祁婺高速公路边坡土壤质量的关键因素,孔隙度和盐渍化为次要因子。本研究为公路边坡土壤有机碳的变化提供参考,呼吁公路交通环保从业人员在公路边坡生态恢复过程中关注土壤有机碳的变化,为未来公路建设绿色、安全、稳定、韧性发展提供解决方案。

关键词：环境工程土壤有机碳定点观测公路边坡土壤生态修复

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南方丘陵带边坡客土层植被生长特征与土壤养分动态

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公路交通科技 2022年第S2期39卷 368-374页

作者：马建荣孙伯唯赵森张东赵溦交通运输部公路科学研究院公路交通环境保护交通行业重点实验室北京100088

为了解南方丘陵带边坡在客土喷播植被恢复措施下植被生长的初期特征与土壤养分变化规律,依托江西省某高速公路边坡客土喷播工程,采用定位研究法,对5个相同坡度、坡质、植被配比、喷播物料配比的边坡的植被群落特征(盖度、物种多样性和... 详细信息

为了解南方丘陵带边坡在客土喷播植被恢复措施下植被生长的初期特征与土壤养分变化规律,依托江西省某高速公路边坡客土喷播工程,采用定位研究法,对5个相同坡度、坡质、植被配比、喷播物料配比的边坡的植被群落特征(盖度、物种多样性和物候等)和土壤养分因子(pH值、有机质、全氮、全磷、全钾、水解性氮、有效磷、速效钾、含水率)进行了1.a跟踪测试。利用R统计分析软件对客土喷播植被恢复措施下的5个样坡植被特征和土壤养分因子的数据进行了主成份分析。结果表明:植被初步建植1.2 a内边坡的植被盖度、物种多样性和物候显示明显的规律性变化;5个边坡土壤的有机质含量、水解性氮质量分数、有效磷质量分数与植物生长特征相关性较明显;植被多样性与盖度越高,有机质含量越高,相同植被盖度下有机质变化量与植被物种多样性呈正相关,水解性氮趋势变化呈现阴阳坡2种趋势变化,有效磷质量分数变化趋势基本一致;植被生长特征与土壤养分因子之间存在协同关系;土壤的有机质、有效磷、全氮、水解性氮、速效钾、pH值为影响植被生长特征的主要因子。

关键词：环境工程边坡主成份分析植被特征土壤养分动态

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区域地球多圈层交互带调查探索研究

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地球学报 2019年第6期40卷 767-780页

作者：石建省马荣马震中国地质科学院水文地质环境地质研究所河北石家庄050061 中国地质调查局天津地质调查中心天津300170

地球系统科学已成为国际地学研究的热点之一,也是目前解决复杂生态环境问题的主要途径。本文以冀东地区为例,将区域地质调查与地球多圈层交互带研究相结合,以1.5万水文地质调查为依托,构建出一套地球多圈层交互带生态地质调查与填图体系... 详细信息

地球系统科学已成为国际地学研究的热点之一,也是目前解决复杂生态环境问题的主要途径。本文以冀东地区为例,将区域地质调查与地球多圈层交互带研究相结合,以1.5万水文地质调查为依托,构建出一套地球多圈层交互带生态地质调查与填图体系,为冀东地区农作物重金属离子超标、土地利用类型变化、矿山开采等一系列环境问题的解决提供地学建议。通过上述探索研究,提出区域地区地球多圈层交互带调查思路:以地球系统科学理论为指导,以区域生态环境问题为导向,通过开展地球多圈层交互带调查,完成地球多圈层交互带生态地质图,为生态环境问题的解决提供地学建议,为山水林田湖草海统一规划和管理提供科学依据。

关键词：地球系统科学地球多圈层交互带生态环境重金属冀东地区

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Alliance of atomic-scale/nanoscale Fe/Co active sites with hierarchically porous N-doped carbon frameworks for efficient electrocatalytic oxygen reduction

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Rare Metals 2023年第11期42卷 3766-3779页

作者： Hai-Hua Yang Xiao-rong Qian Na Zhang Xia-Ting Jia Zhi-Yan Wen Xiao-Bo Chen Min-Jie Zhou Key Laboratory of Hunan Province for Advanced Carbon-Based Functional materials Hunan Institute of Science and TechnologyYueyang414006China School of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang414006China School of Physics and Electronic Science Hunan Institute of Science and TechnologyYueyang414006China Department of Chemistry University of Missouri-Kansas CityKansas City64111USA

Ingenious establishment of transition metal-nitrogen-carbon electrocatalysts with diverse catalytic active sites and hierarchically porous frameworks is highly significant to boost the oxygen reduction reaction(ORR)in Zn-air batteries(ZABs).In this study,Fe/Co co-doped zeolitic imidazolium frameworks(ZIFs)and graphitic carbon nitride(g-C_(3)N_(4))were integrated and pyrolyzed to construct carbon-based electrocatalysts containing Fe,Co and N elements(labelled as Co-CoFe@NRPC),in which atomic-sc ale FeN_x and CoN_x,and nano scale metallic Co and CoFe alloy moieties were aligned with hierarchically porous N-doped carbon frameworks constructed by interconnected micropolyhedrons,nano tubes and *** diverse active moieties guaranteed excellent intrinsic catalytic activity,while the hierarchically porous N-doped carbon frameworks ensured admirable accessibility of the catalytic active sites,excellent electrical conductivity,satisfactory {1.ss transport and good ***,the optimized Co-CoFe@NRPC-90(with 90 mg g-C_(3)N_(4) added)electrocatalyst exhibited excellent ORR perfor{1.nce with a high half-wave potential of 885 mV(*** hydrogen electrode(RHE)),diffusion-limiting current density of 6.1. {1.·cm^(-2),desirable durability and methanol ***,the liquid ZAB established with Co-CoFe@NRPC-90 as an air-cathode electrocatalyst {1.nifested an outstanding power density(281.mW·cm^(-2))and specific capacity(820.9 {1.h·g_(Zn)^(-1.),transcending the liquid ZAB based on a commercial Pt/C electrocatalyst.

关键词： Fe/Co co-doped zeolitic imidazolium frameworks Graphitic carbon nitride Transition metal-nitrogen-carbon electrocatalyst Oxygen reduction reaction(ORR)

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Highly efficient electroreduction of CO_(2) by defect single-atomic Ni-N_(3) sites anchored on ordered micro-{1.croporous carbons

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Science china Chemistry 2022年第8期65卷 1584-1593页

作者： Qiu-Xia Li Duan-Hui Si Wan Lin Yao-Bing Wang Hong-Jing Zhu Yuan-Biao Huang rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry Fuzhou UniversityFuzhou 350108China University of the Chinese Academy of Sciences Beijing 100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Infor{1.tion of china Fuzhou 350108China

Microporous supports typically fail to fully expose active sites for electrolytes and CO_(2) molecules,and this usually results in low current density for the electrocatalytic CO_(2) reduction reaction(CO_(2)RR).To overcome the biggest obstacle and facilitate commercial applications,defective single-atomic Ni-N_(3) sites anchored to ordered micro-{1.croporous N-doped carbon(Ni-N/OMC)have been prepared by the pyrolysis of the Ni-ZIF-8@PS(ZIF=zeolitic imidazolate framework)and are intended to provide enhanced CO_(2)RR with a current density at an industrial *** Ni-ZIF-8@PS is constructed of nickel-based ZIF-8 embedded in the three-dimensional(3D)highly ordered polystyrene spheres(PS).The 3D ordered micro-{1.croporous architecture of Ni-N/OMC could facilitate the {1.ss transfer of substrates to the accessible defective single-atomic Ni-N_(3) sites through micropores(0.6 nm)and {1.cropores(~200 nm)interconnected by 50 nm *** a flow cell,Ni-N/OMC exhibits almost 1.0.0%CO Faraday efficiency(FECO)between−0.2 and−1.1.V *** and an industrial level CO partial current density of 208 {1. cm^(−2).It has a turnover frequency of 1.5×1.^(5) h^(−1. at−1.1.V *** in 1.M KOH electrolyte,which exceeds that of most reported nickel-based *** excellent CO_(2)RR perfor{1.nce for Ni-N/OMC {1.kes it a state-of-the-art electrocatalyst for CO_(2)*** calculations show that the defective Ni-N_(3) site can lower the energy of*COOH for{1.tion compared with that of the Ni-N4 site,thereby accelerating CO_(2)***-N/OMC can also be utilized as a cathodic catalyst in Zn-CO_(2) battery,exhibiting high CO selectivity in the discharge process and excellent *** work paves a pathway to rational design of highly efficient electrocatalysts with 3D hierarchically ordered micro-{1.croporous architecture for CO_(2)RR towards industrial production and commercial applications.

关键词： metal-organic framework hierarchically ordered porous carbon Ni single atom CO_(2)electrocatalysis CO

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LLM-1.5与高聚物黏结剂界面相互作用及力学性能的分子动力学模拟

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含能材料 2019年第8期27卷 644-651,I0002页

作者：郭蓉杨志剑段晓惠裴重华西南科技大学环境友好能源材料国家重点实验室四川绵阳621010 中国工程物理研究院化工材料研究所四川绵阳621999

高聚物与2,6-二氨基-3,5-二硝基吡嗪-1.氧化物(LLM-1.5)的界面相互作用直接影响LLM-1.5的表面包覆效果,在原子分子层次的作用模式和强度分析,有助于揭示界面相互作用的微观机制。采用分子动力学(MD)方法,模拟了氟聚物(F231.,F231.,F231.... 详细信息

高聚物与2,6-二氨基-3,5-二硝基吡嗪-1.氧化物(LLM-1.5)的界面相互作用直接影响LLM-1.5的表面包覆效果,在原子分子层次的作用模式和强度分析,有助于揭示界面相互作用的微观机制。采用分子动力学(MD)方法,模拟了氟聚物(F231.,F231.,F231.,F2462)和聚氨酯(Estane 5703)与LLM-1.5不同晶面的界面相互作用,分析了高聚物与LLM-1.5晶面的作用模式和强度,初步提出了高聚物黏结剂的筛选原则,并采用该原则筛选了一个新的高聚物——硝化细菌纤维素(NBC),同时模拟了其与LLM-1.5晶面的相互作用。采用静态弹性常数分析法讨论了6种高聚物对LLM-1.5力学性能的影响。模拟结果表明,所选高聚物与LLM-1.5各晶面的结合能均为正值,结合强度从大到小的顺序为LLM-1.5/NBC≈LLM-1.5/Estane 5703>LLM-1.5/F231.≈LLM-1.5/F231.≈LLM-1.5/F231.>LLM-1.5/F2462。结合能最大的(1.0 1.晶面,在晶体中的显露面最小(0.39%),而结合能小的(0 2 0)和(0 1.1.晶面,其显露面却占了很大比例(二者之和>60%)。在界面相互作用中,范德华力均占据优势地位,远远超过静电相互作用。能与LLM-1.5发生强相互作用的高聚物应能同时提供氢键良给体和良受体。通过对有效各向同性模量和柯西(Cauchy)压值的分析得到,加入NBC、Estane 5703和F2462对LLM-1.5力学性能有所改善,F231.和F231.未有改善,而F231.则有所下降。

关键词： 2,6-二氨基-3,5-二硝基吡嗪-1.氧化物(LLM-1.5) 高聚物界面相互作用力学性能

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赣东北红壤区高速公路边坡土壤侵蚀规律

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公路交通科技 2022年第S2期39卷 364-367页

作者：张东赵溦孙伯唯赵森马建荣交通运输部公路科学研究院、公路交通环境保护技术交通行业重点实验室北京100088

针对红壤区公路边坡土壤侵蚀规律不明晰的问题,以赣东北地区典型高速公路边坡为研究对象,设置坡面径流小区,通过人工降雨模拟试验,数据统计,分析了赣东北红壤区高速公路边坡在降雨、土壤容重、坡度因子影响下的土壤侵蚀规律。结果表明:... 详细信息

针对红壤区公路边坡土壤侵蚀规律不明晰的问题,以赣东北地区典型高速公路边坡为研究对象,设置坡面径流小区,通过人工降雨模拟试验,数据统计,分析了赣东北红壤区高速公路边坡在降雨、土壤容重、坡度因子影响下的土壤侵蚀规律。结果表明:在不同雨强下,土层松散边坡的土壤侵蚀速率与雨强变化的趋势呈正相关,压实边坡的土壤侵蚀速率增加的幅度较小;小雨强条件下边坡土壤容重对土壤侵蚀速率的影响较为显著,土壤侵蚀量随容重的增加而增加,当雨强大于1.74 mm/min时,土体表层出现超渗产流,侵蚀速率随容重的增大而减小;坡度对土壤侵蚀速率的影响是随坡度增大而增加,容重对侵蚀产沙过程的影响要比坡度因素大;在红壤区高速公路边坡生态治理过程中,应对坡体进行压实增大坡面容重,降低坡面坡度,以此来降低土壤侵蚀速率,减小水土流失量。

关键词：环境工程红壤区模拟试验公路边坡土壤侵蚀土壤容重坡度

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