检索结果-内蒙古大学图书馆

Signature of room-temperature two-dimensional ferromagnetism in Ta0.67V0.33Se2

Physical Review B 2024年第18期110卷 184427-184427页

作者： Yuhan Du Yuanji Ma Luo-Zhao Zhang Yiting Liu Xun Zhu Qi Feng Changjian Zhang Xinyi Wang Yuxiang Wang State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200241 China Department of Materials Science & State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200438 China Shanghai Key Laboratory of Green Chemistry and Chemical Processes East China Normal University Shanghai 200241 China State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China

The discovery of ferromagnetism in van der Waals materials attracts intense research interest and holds profound implications for two-dimensional spintronic devices. However, in most cases the Curie temperature of van der Waals ferromagnets is much lower than room temperature, hindering their potential for device applications. In this study we report the discovery of room-temperature ferromagnetism in layered Ta0.67V0.33Se2. The single crystal is synthesized through the partial replacement of tantalum with vanadium. The crystal structure of Ta0.67V0.33Se2 closely resembles that of both 1T-VSe2 and 1T-TaSe2. The resultant Ta0.67V0.33Se2 exhibits a Hall sign reversal at around 60K, with the dominant carrier changing from electron type at higher temperatures to hole type at lower temperatures. The anomalous peak is observed in the longitudinal resistivity near the critical temperature, which is ascribed to the temperature-induced Lifshitz transition. Despite the fact that bulk 1T-VSe2 and 1T-TaSe2 are paramagnetic, Ta0.67V0.33Se2 displays room-temperature ferromagnetism, as evidenced by the hysteresis behavior observed in the field-dependent magnetization. Collective anomalies are observed at about 60K in both magnetization and transport measurements, indicating a strong correlation between electric and magnetic degrees of freedom. Moreover, room-temperature ferromagnetism is confirmed in few-layer Ta0.67V0.33Se2 through magneto-optic Kerr measurements. Our work provides a strategy for accessing two-dimensional high-Curie-temperature magnets, which hold promise for potential applications in spintronic devices.

关键词： Ferromagnetism Magnetic phase transitions 2-dimensional systems Single crystal materials Ultrathin films Van der Waals systems Hall bar Magnetization measurements Raman spectroscopy Resistivity measurements X-ray photoelectron spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Quincke Oscillations of Colloids at Planar Electrodes

引用

Physical Review Letters 2021年第25期126卷 258001-258001页

作者： Zhengyan Zhang Hang Yuan Yong Dou Monica Olvera de la Cruz Kyle J. M. Bishop Department of Chemical Engineering Columbia University New York New York 10027 USA Applied Physics Program Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA

Dielectric particles in weakly conducting fluids rotate spontaneously when subject to strong electric fields. Such Quincke rotation near a plane electrode leads to particle translation that enables physical models of active matter. In this Letter, we show that Quincke rollers can also exhibit oscillatory dynamics, whereby particles move back and forth about a fixed location. We explain how oscillations arise for micron-scale particles commensurate with the thickness of a field-induced boundary layer in the nonpolar electrolyte. This work enables the design of colloidal oscillators.

关键词： Electrokinetic flows Active matter Self-propelled particles

来源：评论

学校读者我要写书评

暂无评论

Methods – Pressure control apparatus for lithium metal battery

arXiv

引用

arXiv 2022年

作者： Lu, Bingyu Bao, Wurigumula Yao, Weiliang Doux, Jean-Marie Fang, Chengcheng Meng, Ying Shirley Department of NanoEngineering University of California San Diego La Jolla CA92093 United States Materials Science and Engineering University of California San Diego La Jolla CA92093 United States Department of Chemical Engineering and Materials Science Michigan State University East LansingMI48824 United States Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States

Lithium (Li) metal anodes are essential for developing next-generation high-energy-density batteries. However, Li dendrite/whisker formation caused short-circuiting issue and short cycle life have prevented lithium metal from being viably used in rechargeable batteries. Numerous works have been done to study how to regulate the Li growth in electrochemical cycling by using external stacking forces. While it is widely agreed that stack pressure positively affects the lithium plating/stripping process, the optimized pressure range provided by different works varies greatly because of the difference in the pressure control setup. In this work, a pressure control apparatus is designed for Li metal batteries with liquid and solid-state electrolytes (SSE). With considerations of minimizing cell to cell variation, a reusable split cell and pressure load cell are made for testing electrochemical cells with high precision pressure control. The capability of the designed setup is demonstrated by studying the pressure effect on the Li plating/stripping process. Copyright © 2022, The Authors. All rights reserved.

关键词： Lithium

来源：评论

学校读者我要写书评

暂无评论

One-Pot Synthesis of Stable Copper-Based Core-Shell Catalysts for Highly Efficient 4-Nitrophenol Reduction and Benzyl Alcohol Oxidation

SSRN

引用

SSRN 2023年

作者： Liu, Jiakang Yang, Han Kara, Ufuoma I. Boerner, Eric Luo, Yiqian Yu, Haitao Xu, Yang Wang, Xiaoguang Huang, Kun School of Chemistry and Molecular Engineering East China Normal University 500 N Dongchuan Road Shanghai200241 China William G. Lowrie Department of Chemical and Biomolecular Engineering The Ohio State University ColumbusOH43210 United States School of Materials Science and Engineering Tongji University Shanghai201804 China Sustainability Institute The Ohio State University ColumbusOH43210 United States

Copper (Cu)-based nanoparticle catalysts have emerged as promising alternatives to noble metal catalysts due to their abundance and cost-effectiveness. However, challenges such as nanoparticle aggregation and oxidation hinder their reusability and overall performance. In this study, we present a highly efficient one-pot synthesis method for Cu-based core-shell catalysts through a combination of impregnation and in situ post-calcination. By incorporating hierarchically porous carbon structures in the core-shell configuration, we effectively mitigate agglomeration and complete oxidation of Cu nanoparticles. The resulting catalysts demonstrate outstanding catalytic performance and long-term stability in 4-nitrophenol reduction and benzyl alcohol oxidation reactions. Overall, our straightforward and rapid synthesis strategy offers a novel approach for fabricating Cu nanoparticle catalysts with exceptional activity and durability, paving the way for sustainable catalytic transformations. © 2023, The Authors. All rights reserved.

关键词： Cost effectiveness

来源：评论

学校读者我要写书评

暂无评论

One-Pot Synthesis of Stable Cu-Based Core-Shell Catalysts for High-Performance Heterogenous Catalysis

SSRN

引用

SSRN 2023年

Copper (Cu)-based nanoparticle catalysts, a series of non-noble metal nanoparticle catalysts, have attracted much attention due to their abundance and low cost. However, Cu nanoparticles are highly susceptible to aggregation and oxidation, which makes them difficult to be reused, limiting their performance and application potential. Here we introduce an efficient one-pot synthesis of Cu-based core-shell catalysts via a combination of impregnation and in situ post-calcination. The construction of hierarchically porous core-shell carbon structures effectively prevents the agglomeration and complete oxidation of Cu nanoparticles, and the catalysts exhibited excellent catalytic performance and stability in 4-nitrophenol reduction and benzyl alcohol oxidation reactions. Overall, this simple and fast synthesis strategy provides a novel design for synthesizing Cu nanoparticle catalysts with high activity and stability. © 2023, The Authors. All rights reserved.

关键词： Catalyst activity

来源：评论

学校读者我要写书评

暂无评论

Imaging Gas Adsorption in MOFs via 4D-STEM

引用

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 313-313页

作者： Karstens, S.L. Murphy, R.A. Velasquez, E.O. Bustillo, K.C. Long, J.R. Minor, A.M. Department of Chemistry University of California Berkeley CA United States Department of Chemical and Biomolecular Engineering University of California Berkeley CA United States National Center for Electron Microscopy Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA United States Department of Materials Science and Engineering University of California Berkeley CA United States

来源：评论

学校读者我要写书评

暂无评论

Effect of surface steps on chemical ordering in the subsurface of Cu(Au) solid solutions

引用

Physical Review B 2021年第3期103卷 035401-035401页

作者： Kuo Liu Siming Zhang Dongxiang Wu Langli Luo Xianhu Sun Xiaobo Chen Dmitri Zakharov Shaobo Cheng Yimei Zhu Judith C. Yang Guofeng Wang Guangwen Zhou Department of Mechanical Engineering and Materials Science and Engineering Program State University of New York Binghamton New York 13902 USA Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh Pennsylvania 15261 USA Center for Functional Nanomaterials Brookhaven National Laboratory Upton New York 11973 USA Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory Upton New York 11973 USA Department of Chemical and Petroleum Engineering University of Pittsburgh Pittsburgh Pennsylvania 15261 USA

Atomic steps are typically assumed to only influence surface phenomena of solids. In contrast, here we show, using in situ atomic-resolution electron microscopy observations and atomistic modeling, the pronounced effect from surface steps in inducing compositional and structural evolution in the subsurface of a Cu(Au) solid solution. We find that Au surface segregation results in a stacked sequence of Cu-Au ordered phases in the subsurface. The presence of a monatomic step at the surface induces the formation of an antiphase boundary that extends from the surface step to deeper layers by maintaining the same composition profile associated with each terrace. The bunching of surface steps induces chemical disordering of the Cu-Au ordered phases in the subsurface region of the bunched steps. These results demonstrate the instant propagation of surface dynamics of atomic steps into the subsurface region and can find broader applicability in utilizing surface defects to tune the composition and structure in the subsurface of alloys.

关键词： Structural properties Surface & interfacial phenomena Alloys Density functional theory Electron microscopy

来源：评论

学校读者我要写书评

暂无评论

High‑Performance Thick Cathode Based on Polyhydroxyalkanoate Binder for Li Metal Batteries

引用

Advanced Fiber materials 2024年第1期6卷 214-228页

作者： Dong Hyuk Kang Minhyuck Park Jeonghun Lee Chan Yeol Kim Jimin Park Youn‑Ki Lee Jong Chan Hyun Son Ha Jin Hwan Kwak Juhee Yoon Hyemin Kim Hyun Soo Kim Do Hyun Kim Sangmin Kim Ji Yong Park Robin Jang Seung Jae Yang Hee‑Dae Lim Se Youn Cho Hyoung‑Joon Jin Seungjin Lee Yunil Hwang Young Soo Yun KU‑KIST Graduate School of Converging Science and Technology Korea University145 Anam‑roSeongbuk‑guSeoul 02841South Korea Carbon Composite Materials Research Center Korea Institute of Science and Technology(KIST)92 Chundong‑roBongdong‑eupWanju‑gunJeollabuk‑do 55324South Korea Energy Storage Research Center Korea Institute of Science and Technology(KIST)514‑gil Hwaraong‑roSeoul 02792South Korea Program in Environmental and Polymer Engineering Inha University100 Inha‑ro Michuhol‑guIncheon 22212South Korea Advanced Analysis Data Center Korea Institute of Science and Technology(KIST)514‑gil Hwaraong‑roSeoul 02792South Korea Advanced Nanohybrids Laboratory Department of Chemistry and Chemical EngineeringInha University100 Inha‑roMichuhol‑guIncheon 22212South Korea CJ CheilJedang Corporation 55 Gwanggyo‑ro 42Beon‑gilYeongtong‑guSuwon 16495South Korea Department of Chemical Engineering Hanyang University222 Wangsimni‑roSeongdong‑guSeoul 04763South Korea Department of Integrative Energy Engineering Korea University145 Anam‑roSeongbuk‑guSeoul 02841South Korea

Thick cathodes can overcome the low capacity issues,which mostly hamper the performance of the conventional active cathode materials,used in rechargeable Li ***,the typical slurry-based method induces cracking and flaking during the fabrication of thick *** addition,a significant increase in the charge-transfer resistance and local cur-rent overload results in poor rate capabilities and cycling stabilities,thereby limiting electrode *** this study,a synergistic dual-network combination strategy based on a conductive nanofibrillar network(CNN)and a nano-bridging amor-phous polyhydroxyalkanoate(aPHA)binder is used to demonstrate the feasibility of constructing a high-performance thick *** CNN and aPHA dual network facilitates the fabrication of a thick cathode(≥250μm thickness and≥90 wt%active cathode material)by a mass-producible slurry *** thick cathode exhibited a high rate capability and excel-lent cycling *** addition,the thick cathode and thin Li metal anode pair(Li//t-NCM)exhibited an optimal energy performance,affording high-performance Li metal batteries with a high areal energy of~25.3 mW h cm^(-2),a high volumetric power density of~1720 W L^(-1),and an outstanding specific energy of~470 W h kg^(-1)at only 6 mA h cm^(-2).

关键词： Thick cathode Polyhydroxyalkanoate binder Nano-bridging Conductive nano-fibrillar network Lithium metal battery

来源：评论

学校读者我要写书评

暂无评论

Investigation of a novel biocide material for biocorrosion in simulated seawater: A case study on Tinospora cordifolia extract

引用

Case Studies in chemical and Environmental engineering 2024年 10卷

作者： Royani, Ahmad Hanafi, Muhammad Aigbodion, Victor Sunday Prastya, Muhammad Eka Verma, Chandrabhan Mubarak, Nabisab Mujawar Alfantazi, Akram Manaf, Azwar Research Center for Metallurgy National Research and Innovation Agency – BRIN Kawasan Puspiptek Banten Tangerang Selatan 15314 Indonesia Postgraduate Program of Materials Science Study Department of Physics Faculty of Mathematics and Natural Sciences Universitas Indonesia Depok 16424 Indonesia Research Center for Pharmaceutical Ingredients and Traditional Medicine National Research and Innovation Agency – BRIN Kawasan Puspiptek Banten Tangerang Selatan 15314 Indonesia Department of Metallurgical and Materials Engineering University of Nigeria Nsukka 410001 Nigeria Department of Chemical and Petroleum Engineering Khalifa University of Science and Technology P.O. Box 127788 Abu Dhabi United Arab Emirates Petroleum and Chemical Engineering Faculty of Engineering Universiti Teknologi Brunei Bandar Seri Begawan BE1410 Brunei Darussalam Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai India

This case report investigates the preventive effect of Tinospora cordifolia extract on biocorrosion induced by Pseudomonas aeruginosa on mild steel API 5L in the simulated seawater medium. Electrochemical techniques, spectroscopic techniques, and surface analysis were employed to investigate biocide performance and corrosion behavior. P. aeruginosa has been shown to enhance iron dissolution in seawater medium. These findings point to the role of P. aeruginosa bacteria in forming differential oxygen, which causes corrosion. Morphology results from atomic Fourier microscopy (AFM) highlight the presence of P. aeruginosa in biotic environments, where the surface is rougher than in abiotic conditions. On the other hand, adding T. cordifolia to the biotic medium resulted in a smoother and more homogeneous surface without any significant deterioration. Electrochemical findings reveal that adding 300 mg L⁻¹ of T. cordifolia extract prevents the microbiologically influenced corrosion (MIC) of steel API 5L, with an optimum effectiveness value of 74.50 % after 21 days of incubation. This protective effect is caused by forming a more compact iron oxide surface layer and the adsorption of phenolic active compounds such as Moupinamide and others on the surface of mild steel API 5L, as detected by liquid chromatography-mass/spectrometry-mass spectrometry (LCMS-MS), Fourier-transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FE-SEM) techniques. © 2024 The Authors

关键词： Bio-corrosion Biofilm Green biocide Plant extract Pseudomonas aeruginosa Tinospora cordifolia

来源：评论

学校读者我要写书评

暂无评论

Highly efficient modulation of the electronic properties of organic semiconductors by surface doping with 2D molecular crystals

引用

science China Chemistry 2020年第7期63卷 973-979页

作者： Yu Zhang Shuyuan Yang Xiaoting Zhu Fei Zhai Yiyu Feng Wei Feng Xiaotao Zhang Rongjin Li Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

Doping is a critically important strategy to modulate the properties of organic semiconductors(OSCs) to improve their optoelectrical performances. Conventional bulk doping involves the incorporation of foreign molecular species(i.e., dopants) into the lattice of the host OSCs, and thus disrupts the packing of the host OSCs and induces structural defects, which tends to reduce the mobility and(or) the on/off ratio in organic field-effect transistors(OFETs). In this article, we report a highly efficient and highly controllable surface doping strategy utilizing 2D molecular crystals(2DMCs) as dopants to boost the mobility and to modulate the threshold voltage of OFETs. The amount of dopants, i.e., the thickness of the 2DMCs, is controlled at monolayer precision, enabling fine tuning of the electrical properties of the OSCs at unprecedented accuracy. As a result, a prominent increase of the average mobility from 1.31 to 4.71 cm2 V-1 s-1 and a substantial reduction of the threshold voltage from -18.5 to -1.8 V are observed. Meanwhile, high on/off ratios of up to 108 are retained.

关键词： organic field-effect transistor organic single crystal 2D molecular crystal surface doping charge transport

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：