检索结果-内蒙古大学图书馆

Emerging hierarchical mesoporous materials of covalent organic frameworks

science China Chemistry 2024年第9期67卷 2796-2802页

作者： Lingyan Huang Wenda Li Hongyi Zhang Shanzhe Ke Hao Chen Jianwei Fu Chengbin Jing Jiangong Cheng Shaohua Liu State Key Laboratory of Precision Spectroscopy/Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450052China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Benefiting from abundant exposed active sites,minimized diffusion resistance of guest molecules,facilitated mass transfer process and enhanced storage capacity,covalent organic frameworks(COFs)have gained widespread scientific attention[1–4].Further construction of mesopores regarding pore engineering(pore size,pore geometry,pore volume,and framework compositions)in COFs can improve mass transport,accessibility as well as size-selectivity of the special guest moieties,thus exhibiting potential in catalysis,energy storage and separation and so on[5,6].

关键词： gained catalysis separation

来源：评论

学校读者我要写书评

暂无评论

Field direction dependent quantum-limit magnetoresistance of correlated Dirac electrons in perovskite CaIrO3

引用

Physical Review B 2023年第8期107卷 L081113-L081113页

作者： Rinsuke Yamada Jun Fujioka Minoru Kawamura Shiro Sakai Motoaki Hirayama Ryotaro Arita Tatsuya Okawa Daisuke Hashizume Ryosuke Kurihara Masashi Tokunaga Yoshinori Tokura Department of Applied Physics University of Tokyo Tokyo 113-8656 Japan Department of Materials Science University of Tsukuba Tsukuba 305-8573 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Research Center for Advanced Science and Technology University of Tokyo Tokyo 153-8904 Japan The Institute for Solid State Physics University of Tokyo Kashiwa 277-8581 Japan Tokyo College University of Tokyo Tokyo 113-8656 Japan

Correlated-electron perovskite CaIrO3 shows the topologically protected line node near the Fermi level, wherein the high-mobility Dirac electrons reach the quantum limit (QL) with the one-dimensionally (1D) dispersive n=0 Landau level (LL) state at a moderate magnetic field. In the QL, the longitudinal magnetoresistance (MR) shows an extreme anisotropy against the field (B) direction in spite of nearly isotropic Dirac band dispersions. The resistivity for B∥a shows an insulating behavior with the MR ratio exceeding 2000% around 18 T, whereas the B∥c MR always remains metallic. This is accounted for in terms of the large difference of Fermi velocity of the n=0 LL between B∥a and B∥c due to the B direction dependent 5d orbital electron hopping, which triggers the different instability toward the charge density wave formation for the 1D (∥B) dispersive n=0 LL.

关键词： Electrical properties Semimetals Numerical techniques Resistivity measurements

来源：评论

学校读者我要写书评

暂无评论

A new transition metal diphosphideα-MoP_(2) synthesized by a high-temperature and high-pressure technique

引用

Chinese Physics B 2023年第1期32卷 563-567页

作者：刘晓磊于振海李建福徐真真周春银董朝辉张丽丽王霞余娜邹志强王晓丽郭艳峰 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China School of Opto-Electronic Information Science and Technology Yantai UniversityYantai 264005China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Physical Science and Technology and Analytical Instrumentation Center School of Physical Science and TechnologyShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China

Monoclinicα-MoP_(2),with the OsGe2-type structure(space group C2/m,Z=4)and lattice parameters a=8.7248(11)Å,b=3.2322(4)Å,c=7.4724(9)Å,andβ=119.263°,was synthesized under a pressure of 4~GPa at a temperature between 1100℃and 1200℃.The structure ofα-MoP_(2) and its relationship to other transition metal diphosphides are ***,the ambient pressure phase orthorhombicβ-MoP_(2)(space group Cmc21)is denser in structure thanα-MoP_(2).Room-temperature high-pressure x-ray diffraction studies exclude the possibility of phase transition fromβ-MoP_(2) to α-MoP_(2),suggesting thatα-MoP_(2) is a stable phase at ambient conditions;this is also supported by the total energy and phonon calculations.

关键词： high-pressure synthesis monoclinic MoP_(2) crystal structure

来源：评论

学校读者我要写书评

暂无评论

Transparent,flexible graphene–ITO-based neural microelectrodes for simultaneous electrophysiology recording and calcium imaging of intracortical neural activity in freely moving mice

引用

Microsystems & Nanoengineering 2025年第1期11卷 417-430页

作者： Miao Yuan Fei Li Feng Xue Yang Wang Baoqiang Li Rongyu Tang Yijun Wang Guo-Qiang Bi Weihua Pei Laboratory of Solid-State Optoelectronics Information Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Institute of Semiconductors University of Chinese Academy of SciencesBeijing 10049China Interdisciplinary Center for Brain Information the Brain Cognition and Brain Disease InstituteShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Shenzhen-Hong Kong Institute of Brain Science Shenzhen 518055China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China

To understand the complex dynamics of neural activity in the brain across various temporal and spatial scales,it is crucial to record intracortical multimodal neural activity by combining electrophysiological recording and calcium imaging *** poses significant constraints on the geometrical,mechanical,and optical properties of the ***,transparent flexible graphene–ITO-based neural microelectrodes with small feature sizes are developed and validated for simultaneous electrophysiology recording and calcium imaging in the hippocampus of freely moving mice.A micro-etching technique and an oxygen plasma pre-treating method are introduced to facilitate large-area graphene transfer and establish stable low-impedance contacts between graphene and metals,leading to the batch production of high-quality microelectrodes with interconnect widths of 10μm and recording sites diameters of 20μ*** electrodes exhibit appropriate impedance and sufficient transparency in the field of view,enabling simultaneous recording of intracortical local field potentials and even action potentials along with calcium imaging in freely moving *** types of electrophysiological signals are found to correlate with calcium *** proof-of-concept work demonstrates that transparent flexible graphene–ITO-based neural microelectrodes are promising tools for multimodal neuroscience research.

关键词： electrophysiology re flexible graphene neural activity neural microelectrodes ITO electrophysiological recording record intracortical multimodal neural activity calcium imaging techniquesthis

来源：评论

学校读者我要写书评

暂无评论

Mesoporous polymers:soft-template self-assembly synthesis and applications

引用

science China Chemistry 2024年第5期67卷 1442-1464页

作者： Facai Wei Tingting Zhang Jianwei Fu Chengbin Jing Jiangong Cheng Shaohua Liu State Key Laboratory of Precision Spectroscopy Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450052China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Mesoporous polymers combine the advantages of polymer materials(abundant polar functional groups,lightweight,flexibility,and processability)and mesoporous structures(high specific surface area,adjustable pore structure,and large pore volume);hence,they have great application potential in sensing,adsorption,catalysis,energy storage,biomedicine,***,developing advanced synthetic strategies for mesoporous polymers and investigating their intrinsic applications have become hot research ***-template-based self-assembly is regarded as a promising approach for synthesizing mesoporous *** work reviews recent progress in the synthetic strategy for producing various mesoporous polymers using soft-template selfassembly,focusing on the synthesis of conductive polymers,phenol-based polymers,and resin-based polymers and their potential ***,perspectives on future applications of mesoporous polymers,along with a few challenges that need to be resolved,are also discussed in this review.

关键词： mesoporous polymer porous material self-assembly soft templates interface synthesis

来源：评论

学校读者我要写书评

暂无评论

Near-infrared double-cable conjugated polymers based on alkyl linkers with tunable length for single-component organic solar cells

引用

Chinese Chemical Letters 2024年第4期35卷 452-456页

作者： Yikun Wang Qiaomei Chen Shijie Liang Dongdong Xia Chaowei Zhao Christopher R.McNeill Weiwei Li Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Institute of Applied Chemistry Jiangxi Academy of SciencesNanchang 330096China Department of Materials Science and Engineering Monash UniversityWellington RoadClaytonVictoria 3800Australia

The photovoltaic properties of double-cable conjugated polymers are significantly influenced by the length of the alkyl linkers that connect donor backbones and acceptor side units. In this study, a series of 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile(IC)-based double-cable polymers with alkyl linkers ranging from C_8H_(16)to C_(16)H_(32)(Px, x = 8, 10, 12, 14, 16) were synthesized for single-component organic solar cells(SCOSCs). Among these, the linker length x = 12(P12) is found to optimize the power conversion efficiencies(PCEs) in SCOSCs. Specifically, PCEs increase from P8 to P12 and then decline from P12to P16. Detailed investigations of optical absorption, charge transport, and morphology provide insights into the underlying factors contributing to these PCE variations. The findings indicate that the exceptional photovoltaic properties observed in P12 can be attributed to three key factors: A delicate balance between enhanced charge separation facilitated by the increased spacer length and reduced crystallinity resulting from longer spacers, higher charge mobilities, and well-balanced hole/electron transport characteristics. This study highlights the critical role of linker length in determining the photovoltaic properties of double-cable conjugated polymer-based SCOSCs and offers valuable guidance for the design of novel double-cable conjugated polymers.

关键词： Single-component organic solar cells Double-cable conjugated polymers Photovoltaic properties Alkyl linkers

来源：评论

学校读者我要写书评

暂无评论

IsoVISoR: Towards 3D Mesoscale Brain Mapping of Large Mammals at Isotropic Sub-micron Resolution

引用

Neuroscience Bulletin 2025年第2期41卷 344-348页

作者： Chao-Yu Yang Yan Shen Xiaoyang Qi Lufeng Ding Yanyang Xiao Qingyuan Zhu Hao Wang Cheng Xu Pak-Ming Lau Pengcheng Zhou Fang Xu Guo-Qiang Bi Division of Life Sciences and Medicine CAS Key Laboratory of Brain Function and DiseaseUniversity of Science and Technology of ChinaHefei230026China Interdisciplinary Center for Brain Information Shenzhen-Hong Kong Institute of Brain ScienceShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Center for Integrative Imaging Hefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei230027China National Engineering Laboratory for Brain-Inspired Intelligence Technology and Application MoE Key Laboratory of Brain-Inspired Intelligent Perception and CognitionSchool of Information Science and TechnologyUniversity of Science and Technology of ChinaHefei230026China Anhui Province Key Laboratory of Biomedical Imaging and Intelligent Processing Institute of Artificial IntelligenceHefei Comprehensive National Science CenterHefei230088China Faculty of Life and Health Sciences Shenzhen University of Advanced TechnologyShenzhen518107China CAS Key Laboratory of Brain Connectome and Manipulation The Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China

Dear Editor,The mammalian brain exhibits cross-scale complexity in neuronal morphology and connectivity,the study of which demands high-resolution morphological reconstruction of individual neurons across the entire brain[1-4].Current commonly used approaches for such mesoscale brain mapping include two main types of three-dimensional fluorescence microscopy:the block-face methods,and the lightsheet-based methods[5,6].In general,the high imaging speed and light efficiency of light-sheet microscopy make it a suitable tool for high-throughput volumetric imaging,especially when combined with tissue-clearing ***,large brain samples pose major challenges to this approach.

关键词： brain mapping three dimensional fluorescence microscopy mesoscale brain mapping lightsheet based methods block face methods high throughput volumetric imaging tissue clearing techniques

来源：评论

学校读者我要写书评

暂无评论

Photoemission evidence of a novel charge order in kagome metal FeGe

引用

science China(Physics,Mechanics & Astronomy) 2025年第6期68卷 172-178页

作者： Zhisheng Zhao Tongrui Li Peng Li Xueliang Wu Jianghao Yao Ziyuan Chen Yajun Yan Shengtao Cui Zhe Sun Yichen Yang Zhicheng Jiang Zhengtai Liu Alex Louat Timur Kim Cephise Cacho Aifeng Wang Yilin Wang Dawei Shen Juan Jiang Donglai Feng Department of Physics School of Emerging TechnologyUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China National Synchrotron Radiation Laboratory School of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China Low Temperature Physics Laboratory College of Physics and Center of Quantum Materials and DevicesChongqing UniversityChongqing 401331China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of SciencesShanghai 200050China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Diamond Light Source Ltd. Harwell Science and Innovation CampusDidcot OX110DEUK New Cornerstone Science Laboratory University of Science and Technology of ChinaHefei 230026China

The kagome metal FeGe provides a rich platform for understanding the mechanisms behind competing orders,as it exhibits charge order(CO)emerging deep within the antiferromagnetic *** investigate the intrinsic origin of this behavior,we examine the evolution of the low-energy electronic structure across the phase transition in annealed FeGe samples using angleresolved photoemission *** find no evidence supporting a conventional nesting mechanism,such as Fermi surface nesting or van Hove ***,we observe two notable changes in the band structure:an electron-like band around the K point and another around the A point,both shifting upward in energy when CO *** findings are consistent with our density-functional theory calculations,which suggest that the charge order in FeGe is primarily driven by magnetic energy savings due to a lattice distortion involving *** results provide photoemission evidence supporting this novel mechanism for CO formation in FeGe,in contrast to the conventional nesting-driven mechanisms.

关键词： kagome metal charge order electronic structure angle-resolved photoemission spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Dimensionality-driven metal to Mott insulator transition in two-dimensional 1T-TaSe2

引用

National science Review 2024年第3期11卷 108-118页

作者： Ning Tian Zhe Huang Bo Gyu Jang Shuaifei Guo Ya-Jun Yan Jingjing Gao Yijun Yu Jinwoong Hwang Cenyao Tang Meixiao Wang Xuan Luo Yu Ping Sun Zhongkai Liu Dong-Lai Feng Xianhui Chen Sung-Kwan Mo Minjae Kim Young-Woo Son Dawei Shen Wei Ruan Yuanbo Zhang State Key Laboratory of Surface Physics New Cornerstone Science Laboratory and Department of PhysicsFudan University Shanghai Qi Zhi Institute Shanghai Research Center for Quantum Sciences Institute for Nanoelectronic Devices and Quantum Computing Fudan University Zhangjiang Fudan International Innovation Center Fudan University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences School of Physical Science and Technology ShanghaiTech University Korea Institute for Advanced Study School of Emerging Technology and Department of Physics University of Science and Technology of China Advanced Light Source Lawrence Berkeley National Laboratory ShanghaiTech Laboratory for Topological Physics Key Laboratory of Materials Physics Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of Sciences High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Collaborative Innovation Centre of Advanced Microstructures Nanjing University Department of Physics University of Science and Technology of China and Key Laboratory of Strongly Coupled Quantum Matter Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China

Two-dimensional materials represent a major frontier for research into exotic many-body quantum phenomena. In the extreme two-dimensional limit, electron-electron interaction often dominates over other electronic energy scales, leading to strongly correlated effects such as quantum spin liquid and unconventional *** dominance is conventionally attributed to the lack of electron screening in the third dimension. Here, we discover an intriguing metal to Mott insulator transition in 1T-TaSe2that defies conventional wisdom. Specifically, we find that dimensionality crossover, instead of reduced screening, drives the transition in atomically thin 1T-TaSe2. A dispersive band crossing the Fermi level is found to be responsible for the bulk metallicity in the material. Reducing the dimensionality,however, effectively quenches the kinetic energy of these initially itinerant electrons, and drives the material into a Mott insulating *** dimensionality-driven metal to Mott insulator transition resolves the long-standing dichotomy between metallic bulk and insulating surface of 1T-TaSe2. Our work further reveals a new pathway for modulating two-dimensional materials that enables exploring strongly correlated systems across uncharted parameter space.

关键词： two-dimensional materials 1T-TaSe2 dimensionality crossover metal to Mott insulator transition

来源：评论

学校读者我要写书评

暂无评论

Slag design and optimization for iron capturing platinum group metals from alumina-based spent catalysts

引用

Rare Metals 2023年第6期42卷 2093-2103页

作者： Xue-Feng He Xi-Ping Yin Yun-Ji Ding Zhi-Sheng Shi Bao-Huai Zhao Huan-Dong Zheng Jin-Xin Jian Shen-Gen Zhang Chein-Chi Chang Research Center for Metal Materials Recycling Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Shunde Innovation Institute of University of Science and Technology Beijing Foshan528399China Institute of Engineering Technology Sinopec Catalyst Co.Ltd.Beijing101111China Department of Engineering and Technical Services District of Columbia Water and Sewer AuthorityWashington DC20032USA

Production of petrochemical catalysts accounts for one of the largest shares of platinum group metals(PGMs) consumption;thus,recycling of spent petrochemical catalysts holds great economic ***,PGMs are recovered through hydrometallurgical processes which have a low recovery efficiency and produce a large amount of *** this regard,this paper proposed a method to use iron-capturing PGMs based on CaO-Al_(2)O_(3)-Na_(2)O *** method avoided the formation of Fe-Si alloy and achieved efficient enrichment of *** droplet force model showed that the recovery efficiency of PGMs could be improved if the slag had low density and low *** on this result,FactSage software optimized the composition of ***,the effect of B_(2)O_(3) on the 1400 ℃ liquidus of CaO-Al_(2)O_(3)-Na_(2)O_(3)-B_(2)O_(3) phase diagram was ***,it was found that the recovery efficiency of PGMs exceeded 99% under the following optimized conditions:basicity of 1.0,20 wt%Na_(2)O,15 wt% B_(2)O_(3),15 wt% Fe,3 wt% C and a temperature range of 1400-1500℃.The thermodynamic model revealed the mechanism of iron *** chemical bonds prevented the formation of bonds between the alloy and slag,resulting in the separation of the slag from the *** particles and iron microspheres had significant surface Gibbs free *** when iron microspheres and PGMs particles collided and fused with each other to reduce their surface area could the Gibbs free energy of the system be reduced.

关键词： Slag type design Spent catalyst Alumina Platinum group metals(PGMs) Iron capture

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：