检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Fang, Cheng Zhang, Ziyi Wang, Jian Ye, Zhanwen Li, Kaiyuan Wu, Luoqi Feng, Xiaobin Duan, Bo Dong, Lijie Zhou, Ling Shen, Zhonghui Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Physics and Mechanics Wuhan University of Technology Wuhan430070 China Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China

The harsh application environment imposes higher requirements on the operating temperature of dielectric energy storage capacitors. Suppressing carrier transmission at high temperatures is a critical way to enhance the breakdown field strength (Eb) and the operating temperature of the dielectrics. In this paper, low-concentration nickel oxide quantum dots (NiOx QDs) with P-type defects are introduced into the polymer matrix, and hot carriers are captured by constructing hole traps, thus improving the high-temperature Eb and energy storage density (Udis) of the polymer. The NiOx QDs were synthesized by the chemical precipitation method and were modified with polydopamine (PDA) to prepare P(VDF-HFP)-based composite films. The results show that the NiOx@PDA QDs can effectively enhance the Eb and Udis of the films. What's more, at 90°C, the Eb of the composite film reaches 2242.78 kV/cm, representing a 42.41% increase compared to pure P(VDF-HFP) film (1574.83 kV/cm), and the Udis reaches 2.94 J/cm3, demonstrating an impressive improvement of 164.86% when compared with pure P(VDF-HFP) (1.11 J/cm3). The results confirmed that the P-type NiOx QDs restricted the Poole-Frenkel emission within the dielectrics. Together with the enhanced compatibility of the organic-inorganic composite interface, the macro defects of the composites were suppressed, and higher Eb and Udis were obtained. This work offers a straightforward and efficient approach for manufacturing high-temperature energy storage dielectrics. © 2024, The Authors. All rights reserved.

关键词： Nanocrystals

来源：评论

学校读者我要写书评

暂无评论

Integrating thin wall into block:A new scanning strategy for laser powder bed fusion of dense tungsten

引用

Journal of materials Science & technology 2022年第25期120卷 167-171页

作者： Zhengang Xiong Ji Zou Zhaoyang Deng Jinhan Chen Wei Liu Yuchi Fan Minshi Wang Xiaoqing Zhao Chunfeng Yu Dongdong Dong Wenyou Ma Weimin Wang Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Institute of Functional Materials Donghua University201620China School of Metallurgy and Materials University of BirminghamBeijing 100084China

Due to a combination of outstanding properties including high melting point,high density,low thermal expansion coefficient,low saturated vapor pressure and excellent thermal conductivity,tungsten(W)parts have been widely used as electrodes,heating elements,anti-scatter grids for Computed Tomography(CT)equipment,rocket nozzles and divertor materials for nuclear fusion[1].

关键词： powder thermal saturated

来源：评论

学校读者我要写书评

暂无评论

Polymersome formation by solvent annealing-induced structural reengineering under 3D soft confinement

引用

Nano Research 2021年第12期14卷 4644-4649页

作者： Xi Mao Hao Li Jinwoo Kim Shuai Deng Renhua Deng Bumjoon J.Kim Jintao Zhu Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education(HUST) and State Key Laboratory of Materials Processing and Die&Mold TechnologySchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan430074China Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea

A solvent annealing-induced structural reengineering approach is exploited to fabricate polymersomes from block copolymers that are hard to form vesicles through the traditional solution self-assembly *** specifically,polystyrene-b-poly(4-vinyl pyridine)(PS-b-P4VP)particles with sphere-within-sphere structure(SS particles)are prepared by three-dimensional(3D)soft-confined assembly through emulsion-solvent evaporation,followed by 3D soft-confined solvent annealing upon the SS particles in aqueous dispersions for structural engineering.A water-miscible solvent(e.g.,THF)is employed for annealing,which results in dramatic transitions of the assemblies,e.g.,from SS particles to *** approach works for PS-b-P4VP in a wide range of block ***,this method enables effective encapsulation/loading of cargoes such as fluorescent dyes and metal nanoparticles,which offers a new route to prepare polymersomes that could be applied for cargo release,diagnostic imaging,and nanoreactor,etc.

关键词： polymersome block copolymer three-dimensional(3D)confinement self-assembly solvent annealing

来源：评论

学校读者我要写书评

暂无评论

Structure and Tribological Evolution of Ta-N Layer by Controlling the Time of Microwave Plasma Nitriding

SSRN

引用

SSRN 2024年

作者： Li, Jiacheng Xu, Zhigang Peng, Jian Shen, Qiang Wang, Chuanbin State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Guangdong Chaozhou521000 China

The Ta-N layer on the Ta matrix surface was synthesized using microwave plasma nitriding (MPN) to enhance its wear resistance. The effects of holding time on the phase composition, morphology, mechanical properties, friction, and wear of the nitriding layers were systematically examined. The results revealed that nanocrystalline Ta-N layers with a dense surface and low roughness were successfully fabricated. The thickness of the Ta-N layer increased from 0.87 μm to 4.23 μm with prolonged holding time. The hardness of the Ta-N layer increased first and then decreased with the extension of holding time, and reached the maximum at 4h. Friction and wear test results indicated that the Ta-N layer exhibited superior wear resistance at the holding time of 4 h, which was mainly attributed to the synergy of dense structure and the generation of the nanocrystal. In conclusion, the Ta-N layer with the desired hardness and wear resistance was obtained due to MPN treatment, which offered excellent surface protection for the Ta matrix in terms of wear resistance. © 2024, The Authors. All rights reserved.

关键词： Nanocrystals

来源：评论

学校读者我要写书评

暂无评论

Platinum clusters stabilized by zincosilicate zeolite for efficient propane dehydrogenation

引用

Chinese Journal of Catalysis 2025年第4期71卷 208-219页

作者： Hao Liu Ying Zhang Liyang Liu Tianxiang Chen Xingcong Zhang Peng Hu Chao Xiong Jie Zhou Hao Zhang Lihui Dong Tsz Woon Benedict Lo Bing Nan Xiaohui He Hongbing Ji Key Laboratory of Bioinorganicand Synthetic Chemistry of Ministry of Education Fine Chemical Industry Research InstituteSchool of ChemistryIGCMESun Yat-sen UniversityGuangzhou 510275GuangdongChina Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical EngineeringGuangxi UniversityNanning 530004GuangxiChina Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteShanghai 200120China State Key Laboratory of Chemical Biology and Drug Discovery Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic UniversityHunghomHong KongChina State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology Institute of Green Petroleum Processing and Light Hydrocarbon ConversionCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014ZhejiangChina Guangdong Technology Research Center for Synthesis and Separation of Thermosensitive Chemicals Guangzhou 510006GuangdongChina

Dispersing metals from nanoparticles to clusters is often achieved using ligand protection methods,which exhibit unique properties such as suppressing structure-sensitive side ***,this method is limited by the use of different metal precursor salts corresponding to different *** alternative approach,the ion exchange(IE)method,can overcome this limitation to some ***,there is still an urgent need to address the stabilization of metals(especially precious metals)by using IE ***,we reported a Pt cluster catalyst prepared mainly by anchoring Pt atoms via O located near the framework Zn in zincosilicate zeolites and riveted by zeolite surface rings after reduction(reduced Pt/Zn-3-IE).The catalyst can achieve an initial propane conversion of 26%in a pure propane atmosphere at 550℃and shows little deactivation even after 7.5 d of ***,the alteration of catalyst by the introduction of framework Zn was also highlighted and interpreted.

关键词： Zincosilicate zeolite Acid-site identification Rivet effect Pt clusters Propane dehydrogenation

来源：评论

学校读者我要写书评

暂无评论

NiPS_(3)quantum sheets modified nitrogen-doped mesoporous carbon with boosted bifunctional oxygen electrocatalytic performance

引用

Journal of materials Science & technology 2021年第6期65卷 1-6页

作者： Kai Huang Yuyang Xu Yanpeng Song Ruyue Wanga Hehe Wei Yuanzheng Long Ming Lei Haolin Tang Jiangang Guo Hui Wu State Key Laboratory of Information Photonics and Optical Communications School of Science.Beijing University of Posts and Telecommunications Beijing 100876China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences.Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Electrocatalysts for oxygen reduction reactions(ORR)and oxygen evolution reactions(OER)are highly crucial and challenging toward the energy storage and conversion technologies such as fuel cells,metal-air batteries and water *** replace noble-metal based catalysts and boost catalytic performance of carbon-based materials,we initially develop the nickel,phospho rus,sulfur and nitrogen co-modified mesoporous carbon(NiPS_(3)@NMC)as a bifunctional oxygen *** perfo rmance for ORR(half-wave potential at 0.90 V)and OER(10 mA cm^(-2)at 1.48 V)surpasses those of Pt/C coupled with IrO_(2)catalysts and most of the non-precious metal based bifunctional electrocatalysts reported in related ***,the electrochemical durability is also confirmed by accelerated durability tests(ADTs)and long-term chronoamperometry(CA)*** demonstrated that the interfacial effect between NiPS_(3)quantum sheets(QS s)and NMC substrates by thermal activation contributed to the enhanced oxygen electrode bifunctionality with more active sites,due to the electrons-donating from nickel,phosphorus and sulfur elements and relatively enriched pyridinic type *** excellent overall performance highlights the potential application of NiPS3 QSs and NMC composites as the materials on energy conversion and storage.

关键词： NiPS_(3)quantum sheets N-doped mesoporous carbon Bifunctional oxygen electrocatalysts Liquid exfoliation Thermal annealing

来源：评论

学校读者我要写书评

暂无评论

Simpler and Greener Preparation of An In-Situ Polymerized Polyimide Anode for Lithium Ion Batteries

SSRN

引用

SSRN 2023年

作者： Zhang, Qiuyitong Xu, Yuexin Lv, Ning Li, Hanyang Wei, Zijie Tiana, Tian Wang, Yadong Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China

A simplified and greener procedure for in-situ obtaining polyimide anode materials for lithium-ion battery electrodes is developed. The combined polyimide material synthesis and electrode preparation reduces the number of processing steps and treatment duration and decreases the energy required for heat treatment, solvent evaporation, and organic solvent use. More importantly, polymerization in situ on the electrode surface render the polyimide particles a sea urchin-like structure, leading to fast electrochemical kinetics, and significant improvement in discharge capacity and cycling performance compared with materials obtained using traditional procedures. Specific capacities of 1870 mAh g-1 and 2277 mAh g-1 at 30℃ and 60℃, respectively, are obtained. A capacity of 1774 mAh g-1 is retained after 500 cycles at high current density of 1000 mA g-1 at 60℃. This new preparation process not only simplifies the preparation process and makes it greener, but also significantly improves the battery performance, providing new possibilities for the preparation of high-performance low-cost lithium-ion battery electrodes. © 2023, The Authors. All rights reserved.

关键词： Solvents

来源：评论

学校读者我要写书评

暂无评论

ZnO-based micromotors fueled by C02:the first example of self-reorientation-induced biomimetic chemotaxis

引用

国家科学评论（英文版） 2021年第11期8卷 98-105页

作者： Fangzhi Mou Qi Xie Jianfeng Liu Shengping Che Lamya Bahmane Ming You Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

Synthetic chemotactic micro/nanomotors are envisioned to actively'seek out'targets by following specific chemicals,but they are mainly powered by bioincompatible fuels and only show pseudochemotaxis (or advanced chemokinesis) due to their weak self-reorientation *** we demonstrate that synthetic ZnO-based Janus micromotors can be powered by the alternative biocompatible fuel of CO2,and further provide the first example of self-reorientation-induced biomimetic chemotaxis using *** ZnO-based micromotors are highly sensitive to dissolved CO2 in water,which enables the corrosion of ZnO to continuously occur by providing H+ through ***,they can autonomously move even in water exposed to air based on ***,they can sense the local CO2 gradient and perform positive chemotaxis by self-reorientations under the phoretic *** discovery opens a gate to developing intelligent micro/nanomotors powered by,and sensitive to,biocompatible atmospheric or endogenous gaseous chemicals for biomedical and environmental applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Flexible and highly-sensitive pressure sensor based on controllably oxidized MXene

引用

InfoMat 2022年第9期4卷 60-71页

作者： Yanan Ma Yongfa Cheng Jian Wang Si Fu Mengjun Zhou Yue Yang Baowen Li Xin Zhang Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices&International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina School of Mathematics Physics and Optoelectronic EngineeringHubei University of Automotive TechnologyShiyanChina Center for Nanoscale Characterization&Devices(CNCD) Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)WuhanChina Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefeiChina State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijingChina

Conductive Ti_(3)C_(2)T_(x)MXenes have been widely investigated for the construction of flexible and highly-sensitive pressure *** the inevitable oxidation of solution-processed MXene has been recognized,the effect of the irreversible oxidation of MXene on its electrical conductivity and sensing properties is yet to be ***,we construct a highly-sensitive and degradable piezoresistive pressure sensor by coating Ti_(3)C_(2)T_(x)MXene flakes with different degrees of in situ oxidation onto paper substrates using the dipping-drying *** situ oxidation can tune the intrinsic resistance and expand the interlayer distance of MXene *** partially oxidized MXene-based piezoresistive pressure sensor exhibits a high sensitivity of 28.43 kPa^(-1),which is greater than those of pristine MXene,over-oxidized MXene,and state-of-the-art paper-based pressure ***,these sensors exhibit a short response time of 98.3 ms,good durability over 5000 measurement cycles,and a low force detection limit of 0.8 ***,MXene-based sensing elements are easily degraded and environmentally *** MXene-based pressure sensor shows promise for practical applications in tracking body movements,sports coaching,remote health monitoring,and human–computer interactions.

关键词： adjustable sensitivity in situ oxidation interlayer distance MXene pressure sensor

来源：评论

学校读者我要写书评

暂无评论

Polyphenol Synergistic Cerium Oxide Surface Engineering Constructed Core-Shell Nanostructures as Antioxidants for Durable and High-Performance Proton Exchange Membrane Fuel Cells

SSRN

引用

SSRN 2023年

作者： Tang, Haolin Zhao, Shengqiu Liao, Yucong Wang, Rui Liu, Guoliang Zhang, Haining State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory The Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China

The chemical degradation of proton exchange membranes (PEMs) suffering from radical attack is a crucial issue in the development of proton exchange membrane fuel cells (PEMFCs), while incorporating cerium oxide (CeO2) nanoparticles (NPs) with regenerative redox properties to eliminate radicals could effectively alleviate degradation. However, the low stability and restricted activity of CeO2 in the PEMFC operating condition and the poor compatibility with PEM due to CeO2 agglomeration stimulate the urgency for structural modulation of CeO2. Herein, polyphenols surface functionalized CeO2 core-shell structure (CeO2@TP) were constructed via assembling oxidation-induced coupling tea polyphenols (TP) on CeO2 NPs. The TP oligomeric shell as a protective layer enhances the stability of CeO2, mitigating radical scavenging activity degradation and improving compatibility with PEMs. Gratifyingly, the phenolic hydroxyl-rich reductive TP oligomeric shell accelerates the regeneration of Ce(IV) to Ce(III), increasing the proportion of Ce(III) and oxygen vacancies on the CeO2 surface, thus boosting antioxidation efficiency. As a result, the CeO2@TP-based PEMs exhibited an OCV decay rate of 0.22 mV h-1, a maximum power density of 1.06 W cm-2, an H2 crossover value of 2.18 mA cm-2, thickness retention (91.1%), and negligible Ce migration after 404 hours of accelerated degradation testing. © 2023, The Authors. All rights reserved.

关键词： Oligomers

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：