检索结果-内蒙古大学图书馆

Structural,electronic,and magnetic properties of quaternary Heusler CrZrCoZ compounds:A first-principles study

Chinese Physics B 2020年第7期29卷 464-473页

作者： Xiao-Ping Wei Tie-Yi Cao Xiao-Wei Sun Qiang Gao Peifeng Gao Zhi-Lei Gao Xiao-Ma Tao The School of Mathematics and Physics Lanzhou Jiaotong UniversityLanzhou 730070China Institute of Materials Science Technische Universitat Darmstadt64287 DarmstadtGermany Key Laboratory of Mechanics on Western Disaster and Environment Ministry of EducationCollege of Civil Engineering and MechanicsKey Laboratory of Special Function Materials and Structure Design of Ministry of EducationLanzhou UniversityLanzhou 730000China School of Physical Science and Technology Guangxi UniversityNanning 530004China

Using the first-principles calculations,we study the structural,electronic,and magnetic properties along with exchange interactions and Curie temperatures for CrZrCoZ(Z=Al,Ga,In,Tl,Si,Pb)quaternary Heusler *** results show that the CrZrCoZ alloys are half-metallic ferrimagnets,and their total spin magnetic moments,which are mainly carried by the Cr atom,obey the Slater-Pauling *** of local density of states confirms that the exchange splitting between eg and t2g states leads to the formation of half-metallic *** to the calculated Heisenberg exchange coupling parameters,it is found that the Cr(A)-Cr(A)and Cr(A)-Zr(B)exchanges dominate the appearance of ferrimagnetic states in CrZrCoZ(Z=Al,Ga,In,Tl,Pb)alloys,and it is the Cr(A)-Zr(B)and Zr(B)-Zr(B)exchanges for CrZrCoSi ***,we estimate the Curie temperatures of CrZrCoZ by using mean-field approximation,it is found that the CrZrCoZ(Z=Al,Ga,In,Tl,Pb)alloys have noticeably higher Curie temperatures than room ***,we expect that the CrZrCoZ alloys are promising candidates in spintronic applications in future.

关键词： quaternary Heusler alloys electronic structure magnetic properties Curie temperature

来源：评论

学校读者我要写书评

暂无评论

Efficient photoreduction strategy for uranium immobilization based on graphite carbon nitride/activated carbon nanocomposites

引用

Chinese Chemical Letters 2022年第7期33卷 3581-3584页

作者： Shuyang Li Zhiwei Niu Duoqiang Pan Zhenpeng Cui Hewen Shang Jie Lian Wangsuo Wu Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Key Laboratory of Special Function Materials and Structure Design Ministry of EducationLanzhou 730000China

Uranium removal from aqueous solutions using environmentally friendly photocatalytic technology is a novel approach for resource ***,carbon nitride/activated carbon composite materials(CN/AC)were investigated for U(Ⅵ)reduction under visible *** exceptional boost in photocatalytic activity was observed for CN/AC composites(up to 70 times over the conventional bulk g-C_(3)N_(4)).The strong interactive conjugatedπ-bond structure between g-C_(3)N_(4) and AC accelerated the migration of carriers and then prolonged the electron ***/AC composites exhibited excellent compatibility with different water substrates and were resilience to a wide range of p H changes and abundant competitive anions/*** experiments and electron microscopy characterization indicated that U(VI)was reduced by photogenerated electrons and deposited on the edge of CN/AC *** low-cost,high-performance carbon-based composite material proposed in this work is a potential candidate for the efficient treatment of radioactive wastewater.

关键词： Uranium removal Photoreduction Graphitic carbon nitride Activated carbon Composite material

来源：评论

学校读者我要写书评

暂无评论

China's progress in radionuclide migration study over the past decade(2010–2021):Sorption,transport and radioactive colloid

引用

Chinese Chemical Letters 2022年第7期33卷 3405-3412页

作者： Zongyuan Chen Siyuan Wang Huijuan Hou Kang Chen Pengyuan Gao Zhen Zhang Qiang Jin Duoqiang Pan Zhijun Guo Wangsuo Wu Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China The Key Laboratory of Special Function Materials and Structure Design Ministry of EducationLanzhou UniversityLanzhou 730000China Radiochemistry Laboratory School of Nuclear Science and TechnologyLanzhou UniversityLanzhou 730000China

The radionuclide(RN)migration study is not only helpful to understand environmental behavior of RNs,but also can establish the basis for the safety assessment of geological disposal of high-level radioactive waste(HLW).In the context of China’s HLW disposal,this review briefly summaries the progress of China’s RN migration studies over the past decade regarding three aspects,RN sorption,RN transport and radioactive *** studies from other disciplines(such as geology and environmental science)are also included in this review because they can provide references for the RN migration ***,China has achieved clear progress in RN migration study over the past decade,although large-scaled field experiments are lacked and a gap still exists comparing with the international advanced ***,several suggestions are proposed for future RN migration research in China.

关键词： High-level radioactive waste Sorption Transport Colloid Spectroscopic analysis Theoretical calculation

来源：评论

学校读者我要写书评

暂无评论

Sulfur vacancies-doped Sb_(2)S_(3) nanorods as high-efficient electrocatalysts for dinitrogen fixation under ambient conditions

引用

Green Energy & Environment 2022年第4期7卷 755-762页

作者： Xuyan Wang Jianwei Bai Yantao Wang Xiaoying Lu Zehua Zou Junfeng Huang Cailing Xu State Key Laboratory of Applied Organic Chemistry Laboratory of Special Function Materials and Structure Design of the Ministry of EducationCollege of Chemistry and Chemical EngineeringLanzhou UniversityNo.222 Tianshui South RoadLanzhou730000China Lanzhou No.11 Middle School No.523 Pingliang RoadLanzhou730000China

Tuning surface electron transfer process by sulfur(S)-vacancies engineering is an efficient strategy to develop high-efficient catalysts for electroreduction N_(2) reaction(NRR). Herein, the distinct Sb_(2)S_(3) nanorods with S-vacancies(Sv-Sb_(2)S_(3)) have been synthesized by a simple twostep method including hydrothermal and hydrogenation in H_(2)/Ar atmosphere, which shows improved performance for NRR with the NH_(3) yield rate of 10.85 μg h^(-1) mgcat^(-1) at-0.4 V vs. RHE, the faradaic efficiency(FE) of 3.75% at -0.3 V vs. RHE and excellent stability for 24 h, largely outperforming bulk Sb_(2)S_(3). X-ray photoelectron spectroscopy(XPS) and density function theory(DFT) calculations demonstrate that the abundant S-vacancies can create an electron-deficient environment and modulate the electron delocalization in Sv-Sb_(2)S_(3), which can not only facilitate the N_(2) molecule adsorption, but also activate the N≡N, resulting in the enhanced performance for NRR.

关键词： Electrocatalyst N_(2)electroreduction reaction Vacancies Defect engineering

来源：评论

学校读者我要写书评

暂无评论

Magnetic suppression for a possible Fe-poor organic-inorganic hybrid superconductor Fe14Se16(tepa)0.8(tepa=tetraethylenepentamine)with a superconducting transition at∼42 K

引用

Journal of materials Science & Technology 2024年第31期198卷 98-110页

作者： Da Li Qifeng Kuang Xiaoling Men Bo Zhang Jianqi Huang Xiaolei Shang Bing Yang Teng Yang Zhiwei Li Zhidong Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Lab for Magnetism and Magnetic Materials of the Ministry of Education Key Lab for Special Functional Materials and Structure Design of the Ministry of EducationLanzhou UniversityLanzhou 730000China

Composition/structure-dependent superconductivity for FeSe-based superconductors attracted great attention not only due to their high superconducting transition temperatures(TC),but also for understanding the origin of iron-based ***,we report a new Fe-poor organic-inorganic hybrid material Fe_(14)Se_(16)(tepa)0.8 with a paramagnetic-diamagnetic transition at∼42 K grown by a high-temperature organic-solution-phase method with soluble iron/selenium sources in a tepa solution,alternative to previous intercalation *** Fe_(14)Se_(16)(tepa)0.8 phase is in a tetragonal layered hybrid structure with a nanoplate *** analyses reveal a Fe-poor characteristic of the hybrid in contrast to previous FeSe-intercalated superconductor,and selected area electron diffraction pattern is featured by Fe_(3)Se_(4) superstructures with a√2×√2 of Fe vacancy *** initio density functional calculations show that minus Fe_(3)Se_(4) ions are stable in the hybrid and∼0.25e-/Fe_(0.75)Se is obviously larger than the reported values of approximately 0.2e-/FeSe in other FeSe-intercalated *** hysteresis loops and temperature dependence of dc/ac susceptibilities of the Fe_(14)Se_(16)(tepa)0.8 measured below∼42 K suggest a presence of the Meissner effect in this *** of synthesis conditions on structures and magnetic properties of the hybrids show a magnetic evolution from a long-range ferrimagnetic(FIM)order of Fe_(14)Se_(16)(tepa)to a coexistence of FIM and superconducting(SC)orders of Fe_(14)Se_(16)(tepa)0.9 and an SC order of Fe_(14)Se_(16)(tepa)0.8.X-ray absorption spectrum(XAS)confirms the presence of ferric/ferrous irons.Mössbauer studies reveal that the high-TC superconductivity originates from a suppression of the FIM order through tuning the spin states of irons from high-spin Fe^(3+)(S=5/2)and Fe^(2+)(S=2)in the Fe_(14)Se_(16)(tepa)to low-spin Fe^(3+)(S=1/2)and Fe^(2+)(S=0)in the Fe_(14)Se_(16)(tepa)***

关键词： Iron-based hybrid superconductor Superconductivity Superconducting transition Magnetic properties Solution synthesis

来源：评论

学校读者我要写书评

暂无评论

Selenization triggers deep reconstruction to produce ultrathin γ-NiOOH toward the efficient water oxidation

引用

Journal of Energy Chemistry 2021年第12期30卷 651-658,I0015页

作者： Kailu Guo Hua Li Junfeng Huang Yantao Wang Yong Peng Siyu Lu Cailing Xu State Key Laboratory of Applied Organic Chemistry Laboratory of Special Function Materials and Structure Design of the Ministry of EducationCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000GansuChina School of Materials and Energy Lanzhou UniversityLanzhou 730000GansuChina Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450000HenanChina

Transition metal chalcogenides will be in situ transformed into metal oxyhydroxides during oxygen evolution reaction(OER) process in alkaline ***,most of these compounds only undergo surface reconstruction under operating conditions,which contains a large percentage of inactive atoms in the core,thus limiting the exposure of the active ***,we synthesize a Ni-Mo-Se precatalyst with three-dimensional hierarchical structure and develop a facile on-site electrochemical activation strategy for achieving deep reconstruction of the *** the combination of multiple spectroscopic characterizations and high resolution electron microscopy techniques,we unravel that the Ni-Mo-Se precatalyst is deeply reconstructed into γ-NiOOH with co-leaching of Mo and Se after the anodic *** flower-like γ-NiOOH is constituted by distorted ultrathin nanosheets with a thickness of ~4.5 nm and contains abundant intercalated species such as water and OH^(-)/CO_(3)^(2-) thus offering a large quantity of accessible active *** reach the current density of 10 mA cm^(-2),the derived electrode requires an overpotential of only 244 mV,outperforming almost all the reported *** work highlights the reconstruction chemistry and provides a simple method for the preparation of efficient OER electrocatalyst.

关键词： Electrocatalyst Deep reconstruction NiOOH Ni-Mo-Se Oxygen evolution reaction

来源：评论

学校读者我要写书评

暂无评论

Effect of hydrogen plasma implantation on the micro-structure and magnetic properties of hcp-Co_(80)^(57)Fe_(4)Ir_(16)thin films

引用

Chinese Physics B 2021年第5期30卷 644-649页

作者： Hui Wang Meng Wu Haiping Zhou Bo Zhang Shixin Hu Tianyong Ma Zhiwei Li Liang Qiao Tao Wang Fashen Li Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Key Laboratory for Special Functional Materials and Structure Design of the Ministry of EducationLanzhou UniversityLanzhou 730000China Department of Physics Xiamen UniversityXiamen 361005China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China School of Electrical and Information Engineering North Minzu UniversityYinchuan 750021China

We present detailed investigations of structural and static/dynamic magnetic properties of hydrogenated hcp-Co_(80)^(57)Fe_(4)Ir_(16) soft magnetic thin *** different kinds of defects,i.e.,destructive and non-destructive,were demonstrated by controlling the negative bias voltage of the hydrogenation *** results show that the structure and magnetic properties of our sample can be tuned by the density of the induced *** results provide better understanding of the hydrogenation effect and thus can be used in the future for materials processing to meet the requirements of different devices.

关键词： soft magnetic thin film hydrogen plasma implantation Mössbauer spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Electrical stimulation for brighter persistent luminescence

引用

Light(Science & Applications) 2024年第8期13卷 1590-1601页

作者： Xilin Ma Yuhua Wang Takatoshi Seto Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform CommissionDepartment of Materials ScienceSchool of Materials and EnergyLanzhou UniversityNo.222South Tianshui RoadLanzhouGansu 730000China

An immature understanding of the mechanisms of persistent luminescence(PersL)has hindered the development of new persistent luminescent materials(PersLMs)with increased *** this regard,in-situ direct current(DC)electric field measurements were conducted on a layered structure composed of the SrAl_(2)O_(4):Eu^(2+),Dy^(3+)phosphor,and an *** this study,the photoluminescence(PL)and afterglow properties were investigated with respect to voltage by analyzing the current signal and thermoluminescence(TL)*** intensity of PersL increased due to a novel phenomenon known as“external electric field stimulated enhancement of initial brightness of afterglow”.This dynamic process was illustrated via the use of a rate equation approach,where the electrons trapped by the ultra-shallow trap at 0.022 eV could be transferred through the conduction band during long *** afterglow intensity could reach 0.538 cdm^(-2)at a 6 V electric *** design of an electric field stimulation technique enables the enhancement of the intensity of PersLMs and provides a new perspective for exploring the fundamental mechanics of certain established PersLMs.

关键词： spectroscopy luminescence conduction

来源：评论

学校读者我要写书评

暂无评论

design, synthesis and evaluation of a fluorescent PI3K inhibitor as a dual-function agent toward Cancer Theranostics

引用

Bioorganic and Medicinal Chemistry Letters 2025年 124卷

作者： Shi, Ge Tian, Hua Chu, Shiji Liu, Dan Yan, Zheng Yang, Min Xu, Heng Key Laboratory of Structure-Based Drugs Design & Discovery of Ministry of Education Shenyang Pharmaceutical University Shenyang 110016 China State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100050 China Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100050 China CAMS Key Laboratory of Small Molecule Immuno-Oncology Drug Discovery Chinese Academy of Medical Sciences Beijing 100050 China State Key Laboratory of Digestive Health Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College Beiiing 100050 China

The development of PI3K-targeted therapeutics has advanced significantly, yet molecular tools capable of simultaneous kinase inhibition and real-time visualization of drug distribution remain limited. Herein, we describe the rational design, synthesis, and biological evaluation of a novel fluorescent PI3K inhibitor (compound 1) that incorporates a 4-methylquinazoline pharmacophore conjugated to fluorescein isothiocyanate (FITC) through a piperazine linker. 1 demonstrated potent PI3K enzymatic inhibition and exhibited significant antiproliferative effects against HGC-27 and MCF-7 cancer cell lines. Mechanistic investigations revealed that 1 effectively suppresses DNA synthesis, triggers G0/G1 cell cycle arrest, and disrupts mitochondrial architecture. Fluorescence-based cellular and in vivo imaging studies demonstrated the compound's preferential cytoplasmic localization and tumor-targeting properties. This dual-function inhibitor not only advances PI3K-targeted drug discovery but also provides a valuable tool for real-time monitoring of drug distribution, representing a promising addition to the growing field of cancer theranostics. © 2025

关键词： Cancer Theranostics Dual-function Fluorescent inhibitor PI3K

来源：评论

学校读者我要写书评

暂无评论

Cracked bark-inspired ternary metallic sulfide(NiCoMnS_(4)) nanostructure on carbon cloth for high-performance aqueous asymmetric supercapacitors

引用

Science China materials 2021年第7期64卷 1632-1641页

作者： Xiao Wang Ling Tian Xiao Long Mingzhe Yang Xiaoqiang Song Wenlu Xie Dequan Liu Yujun Fu Junshuai Li Yali Li Deyan He Key Laboratory of Special Function Materials&Structure Design of the Ministry of Education and School of Physical Science&TechnologyLanzhou UniversityLanzhou 730000China

In this paper,we report a high-performance selfsupported supercapacitor electrode composed of a cracked bark-shaped Ni-Co-Mn ternary metallic sulfide(NiCoMnS4)nanostructure on carbon cloth prepared by a simple one-step hydrothermal process and subsequent electrochemical *** electrode delivers a high specific discharge capacity of up to 2470.4 F g^(-1) at 1 A g^(-1) and high rate performances of1635.6 F g^(-1) at 10 A g^(-1) and 910.2 F g^(-1) even at 32 A g^(-1).Cycling tests indicate that NiCoMnS_(4) could maintain >91.1% of its initial capacity and nearly 100% Coulombic efficiency over10,000 cycles at 8 A g^(-1).An aqueous asymmetric supercapacitor assembled with NiCoMnS_(4) as the cathode,activated carbon as the anode,and 1 mol L^(-1) KOH as the electrolyte delivers an energy density of 68.2 W h kg^(-1)at 850.1 W kg^(-1) and capacity retention of 92.5% after 10,000 cycles at 4 A g^(-1).Given the excellent performance and simple material preparation of our proposed device,this study provides a valuable foundation for the development of self-supported metallic sulfide-based electrodes with high electrochemical properties for potential application in aqueous asymmetric supercapacitors.

关键词： high-performance self-supported electrodes ternary metallic sulfide high specific capacity aqueous asymmetric supercapacitors high energy density

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：