检索结果-内蒙古大学图书馆

Ultrafast coherent phonon dynamics in the kagome magnet GdV6Sn6

Physical Review B 2025年第5期111卷 054308-054308页

作者： Juntao Fu Yadong Han Yuting Wang Huangyu Wu Yunfang Yang Rongxiao Du Jianzhou Zhao Hang Zhang Junhong Yu State Key Laboratory for Environment-Friendly Energy Materials Southwest University of Science and Technology Mianyang 621010 China Laboratory for Shock Wave and Detonation Physics Institute of Fluid Physics China Academy of Engineering Physics Mianyang 621900 China Co-Innovation Center for New Energetic Materials Southwest University of Science and Technology Mianyang 621010 China School of Science Southwest University of Science and Technology Mianyang 621010 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China

The kagome intermetallic compound RV6Sn6 (R=rare earth) not only supports unique lattice geometries and nontrivial topological band structures but also exhibits long-range magnetic order at low temperatures, providing an ideal platform for studying interactions among electrons, phonons, and magnetism. Phonons play a crucial role in the coupling between magnetic order and topological fermions, whose dynamics are essential for understanding the complex multiple degrees of freedom interaction in RV6Sn6. In this work we systematically investigate the temperature-dependent coherent phonon dynamics of GdV6Sn6, and two characteristic temperature points have been identified (i.e., Te at ∼100K and Tm at ∼5K). Specifically, we have observed the anomalous softening and suppressed decaying of the Ag4 phonon mode when approaching Te, which may result from the change of density of states near the Fermi surface, while around Tm, the hardening and accelerated decaying of the Ag4 phonon mode emerges since the buildup of magnetic order alters the phonon energy renormalization and opens an additional scattering channel.

关键词： Fermions

来源：评论

学校读者我要写书评

暂无评论

Long Shelf Life, Intrinsically Flame Retardant, Transparent, High-Performance One-Component Epoxy Resin Based on Phosphorus-Containing Imidazole Derivatives

SSRN

引用

SSRN 2023年

作者： Chai, Mingzhuo Liu, Li Zhang, Pengbo Huang, Yudong MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China

The one-component epoxy resin composed of latent phosphate-containing imidazole curing agent exhibits outstanding flame retardancy and thermal resistance. However, its shelf life needs to be further improved to reduce its storage cost. Besides, the transparency and mechanical properties of these cured products are also affected during the improvement of fire safety. Herein, two latent phosphorus-containing imidazole curing agents (PHI-HPP and EMI-HPP) were synthesized based on the acid-base neutralization effect and steric hindrance effect. Especially, the one-component epoxy resin with PHI-HPP(PHI-HPPx/EP) exhibits a superior shelf life than the one-component epoxy resin with EMI-HPP (EMI-HPPx/EP). PHI-HPPx/EP allows stable storage at room temperature exceeding 91 days, which is better than previous one-component epoxy resins cured by phosphorus-containing imidazole. PHI-HPP20/EP gels rapidly at 150 °C in only 5.7 min. Meanwhile, PHI-HPP20/EP exhibits excellent fire safety and its limiting oxygen index (LOI) is 35.8% achieving a UL-94 V-0 rating. Its peak heat release rate is reduced by 59.3% compared to PHI/EP. PHI-HPPx/EP features good transparency, mechanical properties and glass transition temperature (Tg). Therefore, this research presents a viable approach for preparing one-component epoxy resin with long shelf life, fast curing, flame retardant, transparency and high performance. © 2023, The Authors. All rights reserved.

关键词： Transparency

来源：评论

学校读者我要写书评

暂无评论

Hollow CoFe-layered double hydroxide polyhedrons for highly efficient CO_(2) electrolysis

引用

Science China materials 2022年第2期65卷 536-542页

作者： Miaosen Yang Jiaqiang Sun Yongji Qin Hui Yang Shusheng Zhang Xijun Liu Jun Luo School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Nanchang Institute of Technology Nanchang 330044China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Institute for New Energy Materials and Low-Carbon Technologies Tianjin Key Lab for Photoelectric Materials&DevicesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China College of Chemistry Zhengzhou UniversityZhengzhou 450000China MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of Physical Science and TechnologyGuangxi UniversityNanning 530004China

Over the past several decades,the utilization of fossil fuels is responsible for mainly excessive atmospheric carbon dioxide(CO_(2))[1-3].Increased concentration of CO_(2)contributes to the major portion of the critical issues faced worldwide,such as global warming and drastic changes in ***,it is imperative to develop an alternative technology that is capable of providing an efficient and sustainable pathway to target the neutralization of CO_(2)level in the atmosphere.

关键词：层状双金属氢氧化物电催化二氧化碳还原法拉第二氧化碳固定多面体空心结构氢电极

来源：评论

学校读者我要写书评

暂无评论

In-Situ Epitaxial Growth Achieving Kinetics-Enhanced Multilayer Coni-Mofs as Efficient Electrodes for Asymmetric Supercapacitors

SSRN

引用

SSRN 2023年

作者： Liang, Jianying Qin, Shumin Luo, Shuang Feng, Jinglv Liu, Kang Wang, Yanru Liao, Shenna Li, Jien State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials School of Resources Environment and Materials Guangxi University Nanning530004 China Department of Materials Science & Engineering City University of Hong Kong Hong Kong

Supercapacitors (SCs) as an innovative energy storage technology boast high power density, rapid charging and discharging rates, as well as long cycle life, but it is still challenging to prepare electrode materials with high capacity that can strongly increase their energy density. Metal-organic frameworks (MOFs) as porous materials possess high specific surface area and porosity, and their metal center exhibits reversible redox behavior, promising them as ideal pseudocapacitive electrode materials for supercapacitors. Furthermore, polymetallic MOFs are distinguished by their high redox capacity and theoretical specific capacitance. Herein, multilayer CoNi-MOF nanosheets (m-CNM) are successfully grown on activated carbon cloth (AC) by in-situ epitaxial growth. The m-CNM/AC with multi-layer nanosheet structure and bimetallic synergy provides more electrochemically active sites and shorter charge transfer distance, achieving enhanced kinetics and excellent electrochemical performance with an ultrahigh area specific capacitance of 43.58 F/cm2 at 5 mA/cm2. Moreover, the energy density of the assembled m-CNM//NAC asymmetric supercapacitors achieves 1.25 mWh/cm2 at a power density of 4 mW/cm2. After 10,000 cycles, 98.9% of the initial specific capacitance is maintained, demonstrating outstanding long-term cycle stability. This MOF-based electrode material can enable supercapacitors to achieve better performance, providing new insights and a theoretical basis for the application of MOF in energy storage. © 2023, The Authors. All rights reserved.

关键词： Nanosheets

来源：评论

学校读者我要写书评

暂无评论

Superhydrophobic conductive rubber band with synergistic dual conductive layer for wide-range sensitive strain sensor

引用

Science Bulletin 2022年第16期67卷 1669-1678,M0004页

作者： Hongling Sun Yibing Bu Hu Liu Jingwen Wang Wenke Yang Qianming Li Zhanhu Guo Chuntai Liu Changyu Shen Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesNanjing UniversityNanjing 210023China Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxville TN 37996USA

Wearable electronic devices have received increasing interests because of their excellent flexibility,stretchability,and human *** the core components,flexible strain sensors integrated with wide working range,high sensitivity,and environment stability,especially in moisture or corrosive environments,remain a huge ***,synergistic carbon nanotubes(CNTs)/reduced graphene oxide(rGO)dual conductive layer decorated elastic rubber band(RB)was successfully developed and treated with hydrophobic fumed silica(Hf-SiO_(2))for preparing superhydrophobic strain *** expected,stable entangled CNTs layer and ultrasensitive microcracked rGO layer endow the sensor with extremely low detection limit(0.1%),high sensitivity(gauge factor is 685.3 at 482%strain),wide workable strain range(0–482%),fast response/recovery(200 ms/200 ms)and favorable reliability and reproducibility over 1000 ***,the constructed Hf-SiO_(2) coating also makes the sensor exhibit excellent superhydrophobicity,self-cleaning property,and *** a proof of concept,our prepared high-performance strain sensor can realize the full-range monitoring of human motions and physiological signals even in the water environment,including pulse,vocalization,joint bending,running,and gesture ***,it can also be knitted into a tactile electronic textile for spatial pressure distribution ***,this study provides a universal technique for the preparation of high-performance strain sensors with great potential applications in the field of next-generation intelligent wearable electronics.

关键词： Rubber band Superhydrophobic Strain sensor Synergistic dual conductive layer Wearable electronics

来源：评论

学校读者我要写书评

暂无评论

Single-Atom Engineering of Covalent Organic Framework for Photocatalytic H2 Production Coupled with Benzylamine Oxidation

引用

Small 2023年第35期19卷 2301928-2301928页

作者： Xia, Yang Zhu, Bicheng Li, Liuyi Ho, Wingkei Wu, Jinsong Chen, Haoming Yu, Jiaguo The Education University of Hong Kong Tai Po New Territories 999077 Hong Kong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences 388 Lumo Road Wuhan430074 China Key Laboratory of Eco-materials Advanced Technology College of Materials Science and Engineering Fuzhou University New Campus Fujian Minhou350108 China State Key Laboratory of Marine Pollution City University of Hong Kong Tat Chee Avenue Kowloon999077 Hong Kong Department of Chemistry National Taiwan University Taipei10617 Taiwan

In photocatalysis, reducing the exciton binding energy and boosting the conversion of excitons into free charge carriers are vital to enhance photocatalytic activity. This work presents a facile strategy of engineering Pt single atoms on a 2D hydrazone-based covalent organic framework (TCOF) to promote H2 production coupled with selective oxidation of benzylamine. The optimised TCOF-Pt SA photocatalyst with 3 wt% Pt single atom exhibited superior performance to TCOF and TCOF-supported Pt nanoparticle catalysts. The production rates of H2 and N-benzylidenebenzylamine over TCOF-Pt SA3 are 12.6 and 10.9 times higher than those over TCOF, respectively. Empirical characterisation and theoretical simulation showed that the atomically dispersed Pt is stabilised on the TCOF support through the coordinated N1-Pt-C2 sites, thereby induing the local polarization and improving the dielectric constant to reach the low exciton binding energy. These phenomena led to the promotion of exciton dissociation into electrons and holes and the acceleration of the separation and transport of photoexcited charge carriers from bulk to the surface. This work provides new insights into the regulation of exciton effect for the design of advanced polymer photocatalysts. © 2023 Wiley-VCH GmbH.

关键词： Oxidation

来源：评论

学校读者我要写书评

暂无评论

Spatiotemporal Modulated Solitons in a Quasi-One-Dimensional Spin-1 Bose-Einstein Condensates

SSRN

引用

SSRN 2024年

作者： Liu, Fei-Yan Xu, Su-Yong Triki, Houria Choudhuri, Amitava Zhou, Qin Research Group of Nonlinear Optical Science and Technology School of Mathematical and Physical Sciences Wuhan Textile University Wuhan430200 China College of Optical Mechanical and Electrical Engineering Zhejiang A&F University Lin’an 311300 China Radiation Physics Laboratory Department of Physics Faculty of Sciences Badji Mokhtar University P. O. Box 12 Annaba23000 Algeria Department of Physics The University of Burdwan West Bengal Golapbag 713104 India State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China

In this paper, we investigate the nonautonomous bright/dark solitons in a quasi-one-dimensional spin-1 Bose-Einstein condensates through a three coupled Gross-Pitaevskii (GP) system with space-time-dependent external potential and temporally modulated gain/loss distributions. Based on the Hirota bilinear method, we analytically construct the bright soliton solutions when the coupled GP system exhibits attractive interactions, while we obtain the dark soliton solutions when the coupled GP system exhibits repulsive interactions. The influence of spatiotemporal modulated external potentials, such as the gain/loss distribution Γ(t), on bright/dark soliton dynamics is analyzed in detail via the analytical solutions. By taking different Γ(t), we obtain different types of bright solitons, including periodic, dromion-like and parabolic solitons, and also derive dark solitons on different backgrounds, such as periodic, parabolic and kink backgrounds. We analyze the regulatory effects of different wavenumber ratios on the attraction and squeezing of bound-state solitons. Through the asymptotic analysis, we find that the interactions between two solitons are elastic. In addition, we conduct research on the forward and inverse problems of the above results via the parallel hard-constraint physical informed neural network (phPINN) method. The predicted solitons and potential functions are in good agreement with the exact solitons and potential in the system. © 2024, The Authors. All rights reserved.

关键词： Solitons

来源：评论

学校读者我要写书评

暂无评论

Tellurium Filled Carbon Nanotubes Cathodes for Li-Te Batteries with High Capacity and Long-Term Cyclability

SSRN

引用

SSRN 2023年

作者： Rao, Shaoqing Wu, Ruizhe Zhu, Zhu Wu, Jinsong Ding, Yao Mai, Liqiang School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules College of Chemistry and Chemical Engineering Hubei University Wuhan430062 China

Li-Te batteries, compared with traditional lithium-ion batteries and Li-other group VIA elements (including O, S, Se) batteries, have shown overwhelming features of high specific volumetric capacity and superior electrical conductivity. These features make the Li-Te batteries possess great importance in modern portable electronics and electric vehicles with limited battery package size. However, the Achilles' Heel in Li-Te batteries is the huge volume change and inevitable shuttle effect of polytellurides during cycling. Herein, we synthesize a cathode material based on polycrystalline Te encapsulated in N-doped multiwall carbon nanotubes (Te-filled CNTs) by physical vapor transport (PVT) method. With unique spatial restriction of the CNT hosts, the electrochemically active Te content can be well preserved, and the prepared Te-filled CNTs cathodes deliver a high specific capacity of 590 mAh g-1 based on Te content. More importantly, the reaction kinetics and electrochemical reversibility of the cathodes have been significantly improved by using nanoscale cavities (4-6 nm) by which the polytellurides are stabilized. Meanwhile, a series of in situ Raman, XRD and TEM characterizations are carried out to reveal a two-step discharge/charge mechanism for Te-filled CNTs, which is the key for the excellent cycling stability. In addition, theoretical calculations prove that the encapsulated Te ensure a lower energy barrier for lithiation compared with bare CNT. This work sheds light on the nanoconfinement effect of CNT for improving the utilization and cycling stability of Te in Li-Te batteries, and provides a new strategy of designing high-performance group VIA element based cathodes. © 2023, The Authors. All rights reserved.

关键词： Cathodes

来源：评论

学校读者我要写书评

暂无评论

Near-α Ti60 alloy dwell fatigue basal slip-induced cracking: Faceted crack initiation and local strain evolution

引用

Journal of materials Science & technology 2026年 244卷 313-330页

作者： Boning Wang Weidong Zeng Zibo Zhao Runchen Jia Jianwei Xu Qingjiang Wang Heng Li State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi’an 710072 China Defense Technologies Innovation Center of precision forging and ring rolling School of Materials Science and Engineering Northwestern Polytechnical University Xi’an 710072 China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical University Xi’an 710072 China Shi Changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Basal fracture due to dwell fatigue (DF) is primary cause of core material failure during aero-engine service, which highlights the importance of understanding the crack initiation mechanism. In this study, the relationship between activation of plastic slip within the [0001] basal plane orientation, local strain and crack initiation in near-α Ti60 alloys was investigated using coupled in situ and high-resolution digital image correlation (HR-DIC) methods. The results show that basal slip is preferentially activated resulting into a higher shear strain in DF compared to [10 1 ¯ 0] prismatic orientation grains. Two types of cracking induced by strong basal slip were identified in grains with medium to high basal Schmidt factor (SF): slip transgranular cracking and basal twist grain boundary (BTGB) cracking. The slip deformation and strain evolution of the two types of cracks before and after their initiation were observed for the first time on the sample surface by in-situ dwell, which provides experimental and theoretical support for their formation mechanism. In order to constitute potential locations for crack nucleation, these regions have high local and shear strains during the basal slip stage prior to crack initiation. The higher local strain in the former is attributed to the intrusion and extrusion mechanism of the slip bands, while the latter is attributed to the inconsistency of the slip deformation of the microscopic dislocations on both sides of the BTGB making the GB slip-shear. Additionally, the incoordination on both sides of the GB, coupled with the inherently low cleavage energy, makes the BTGB more susceptible to cracking compared to slip transgranular cracking. No elemental segregation or β-phase influence was observed at the grain boundary interface. This study provides new insights into the mechanisms involved basal slip-induced cracking in Ti alloys subjected to dwell loadings.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Enhancement of oxygen reduction activity and stability via introducing acid-resistant refractory Mo and regulating the near-surface Pt content

引用

Journal of Energy Chemistry 2020年第12期29卷 246-252页

作者： Shouquan Feng Jiajia Lu Lin Luo Guangfu Qian Jinli Chen Hanna SAbbo Salam JJTitinchi Shibin Yin College of Chemistry and Chemical Enginering.School of Physical Science and Technology.Key Laboratory of New Processing Technology for Nonferrous Metals and Materials State Key Laboratory of Processing for Non Ferrous Metal and Featured MaterialsGuangxi UniversityNanning 530004.GuangxiChina Department of Chemitry University of the Western Cape7535 Cape TownSouth Africa

Although Pt Ni catalyst possesses good oxygen reduction activity, its poor stability is the main obstacle for the commercialization of proton exchange membrane fuel cells(PEMFCs). In this work, we introduce the acid-resistant refractory Mo to enhance the structure stability and modify the electronic structure of Pt in the prepared PtNi catalyst, improving the catalytic activity for oxygen reduction reaction(ORR). In addition, near-surface Pt content in the nanoparticle is also optimized to balance the ORR activity and stability. The electrochemical results show that the alloy formed by Mo and Pt Ni is obviously more stable than the PtNi alloy alone, because the acid-resistant Mo and its oxides effectively prevent the dissolution of Pt. Especially, the Pt3 Ni3 MoN/C exhibits the optimal ORR catalytic performance in O2-saturated 0.1 mol L^(-1) HClO4 aqueous solutions, with mass activity(MA) of 900 m A mg^(-1) Pt at 0.90 V vs. RHE, which is 3.75 times enhancement compared with the commercial Pt/C(240 mA mg^(-1) Pt). After 30 k accelerated durability tests, its MA(690 m A mg^(-1) Pt) is still 2.88 times higher than the pristine Pt/C. This study thus provides a valuable method to design stable ORR catalysts with high efficiency and has great significance for the commercialization of PEMFCs.

关键词： Oxygen reduction reaction Surface platinum content regulate Ternary alloy catalyst Activity Stability

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：