检索结果-内蒙古大学图书馆

TPP-SiO 2 Aerogel synergistic modification of polyurea composites towards mechanical shock wave mitigation and flame retardancy

引用

Composites Part B: Engineering 2025年 304卷

作者： Chuanyi Liu Wenlong Xu Cheng Wang Dong Ma Zhihui Zeng Na Wu Institute of Advanced Technology Shandong University Jinan 250061 China Shandong Key laboratory of Thermal Science and Smart Energy Systems Shandong University Jinan 250061 China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing 100081 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials School of Materials Science and Engineering Shandong University Jinan 250061 China School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China

In industrial explosion accidents, mechanical shock waves and flame thermal radiation are the main destructive factors, posing serious threat to life and property. Current designs mainly focus on one of these factors, so it is necessary to develop protective materials against both destructive factors. TPP (Triphenyl phosphate) - SiO 2 Aerogel synergistically modified polyurea composites were developed in this work, which process excellent mechanical shock wave mitigation performance and enhanced flame retardancy. The mechanical shock wave mitigation experiments were conducted on Multi-purpose Shock Cannon (MSC), Human Tissue Equivalent Target (HTET) and full-scale human head model, which comprehensively evaluated the protective performance of polyurea composites for the human body. The flame retardancy was assessed through thermal conductivity, LOI, thermal gravimetric and small flame experiments. The combustion residue was analyzed using SEM, EDS, Raman spectroscopy, and XPS technologies, revealing flame retardant mechanism of TPP-SiO 2 Aerogel synergistically modified polyurea composites. The results showed thatTPP-SiO 2 Aerogel synergistically modified polyurea composites achieved the highest mitigation ratios of overpressure peak and acceleration peak at 13.20 % and 60.87 %, respectively, superior to those of fiber-enhanced polymer composites (Fiber-PE, Fiber-PA6, Fiber-ASA), single filler polyurea, wood and PLA plastic. The flame retardancy was effectively improved, with the highest LOI reaching 24.9 %, far higher than that of pure polyurea (19.6 %). It particularly enhanced the carbonization performance of polyurea composites during combustion, eliminating burning material dropping phenomenon. The thermal insulation performance was also elevated, with the lowest thermal conductivity reduced by 58.6 % compared to pure polyurea.

关键词： Flame retardancy Mechanical shock wave mitigation Polyurea composites TPP-SiO2 aerogel synergistic modification

来源：评论

学校读者我要写书评

暂无评论

Engineering Fe‑N_(4)Electronic Structure with Adjacent Co‑N_(2)C_(2)and Co Nanoclusters on Carbon Nanotubes for Efficient Oxygen Electrocatalysis

引用

Nano-Micro Letters 2023年第12期15卷 283-297页

作者： Mingjie Wu Xiaohua Yang Xun Cui Ning Chen Lei Du Mohamed Cherif Fu‑Kuo Chiang Yuren Wen Amir Hassanpour Francois Vidal Sasha Omanovic Yingkui Yang Shuhui Sun Gaixia Zhang State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200People’s Republic of China Institut National de la Recherche Scientifique(INRS) Center Energie Materiaux TelecommunicationsVarennesQC J3X 1P7Canada Department of Chemical Engineering McGill University3610 University StreetMontrealQC H3A 0C5Canada Department of Electrical Engineering Ecole de Technologie Superieure(ETS)MontrealQC H3C 1K3Canada Canadian Light Source(CLS) 44 Innovation BoulevardSaskatoonSK S7N 2V3Canada National Institute of Low-Carbon-and-Clean-Energy Beijing 102211People’s Republic of China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China

Regulating the local configuration of atomically dispersed transition-metal atom catalysts is the key to oxygen electrocatalysis performance *** the previously reported singleatom or dual-atom configurations,we designed a new type of binary-atom catalyst,through engineering Fe-N_(4)electronic structure with adjacent Co-N_(2)C_(2)and nitrogen-coordinated Co nanoclusters,as oxygen *** resultant optimized electronic structure of the Fe-N_(4)active center favors the binding capability of intermediates and enhances oxygen reduction reaction(ORR)activity in both alkaline and acid *** addition,anchoring M-N-C atomic sites on highly graphitized carbon supports guarantees of efficient charge-and mass-transports,and escorts the high bifunctional catalytic activity of the entire ***,through the combination of electrochemical studies and in-situ X-ray absorption spectroscopy analyses,the ORR degradation mechanisms under highly oxidative conditions during oxygen evolution reaction processes were *** work developed a new binary-atom catalyst and systematically investigates the effect of highly oxidative environments on ORR electrochemical *** demonstrates the strategy for facilitating oxygen electrocatalytic activity and stability of the atomically dispersed M-N-C catalysts.

关键词： Atomically dispersed Fe-N-C catalysts ORR/OER Rechargeable zinc-air battery Fuel cells

来源：评论

学校读者我要写书评

暂无评论

In-situ synthesis of flexible aramid nanofiber@CsPbBr3 coaxial fiber-based paper for effective X-ray shielding

引用

Nano Today 2025年 64卷

作者： Guo, Zizhan Lu, Zhaoqing Zhang, Jingru Jiang, Ming Peng, Guoqiang Hua, Li Dong, Jiayue Jia, Fengfeng Xia, Zhigang Jin, Zhiwen College of Bioresources Chemical and Materials Engineering Shaanxi University of Science & Technology No. 6 Xuefu Road Xi'an710021 China Qilu University of Technology Jinan250000 China Tayho Advanced Materials Group Co. Ltd. Yantai264000 China School of Physical Science and Technology & Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province and Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Gansu Lanzhou730000 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies & School of Textile Science and Engineering & Textile Industry Key Laboratory of Yarn and Its Functionalization & Industry Research and Development Center of Functional Materials and New Textile Technology Wuhan Textile University Wuhan430200 China

Flexible X-ray shielding materials feature better adaptability and dexterity than traditional rigid shielding materials. The effective enhancement of the comprehensive properties of flexible X-ray shielding materials lies in boosting the loading of X-ray absorbing filler while ensuring the retention of their favorable mechanical strength. Here, we designed a Chinese stone arch bridge-like coaxial structure to increase the loading of X-ray absorbing filler CsPbBr3 in aramid nanofiber (ANF) based composites. The robust and flexible ANF@CsPbBr3 coaxial fibers were fabricated via coaxial wet-spinning method. The CsPbBr3 core were rapid in situ crystallized within ANF shell, which achieves the thrilling load capacity for CsPbBr3 in the material and provides protection against CsPbBr3 leakage and intrusion of outside moisture, ensuring outstanding X-ray shielding performances. The Chinese stone arch bridge-like structure obtained during spinning effectively prevented collapse of the coaxial fiber shell. Moreover, the ANF@CsPbBr3 coaxial fibers have excellent flexibility to fabricate an X-ray shielding paper through conventional papermaking process. It also had robust tensile stress (11.8 MPa), lightweight (1.01 g/cm3), excellent X-ray attenuation efficiency (exceed ∼93 % in the 20–70 kV range), and weakened secondary radiation. These findings indicate that the ANF@CsPbBr3 coaxial fiber have a promising potential for developing X-ray shielding materials. © 2025 Elsevier Ltd

关键词： Spinning (fibers)

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to “Abnormal grain growth behavior in gradient nanostructured titanium investigated by coupled quasi-in-situ EBSD experiments and phase-field simulations” [Acta Materialia, 276 (2024) 120141]

引用

Acta Materialia 2025年 282卷

作者： Wei Peng Xiao Li Jianbao Gao Chenyun He Yong Zhang Tiwen Lu Xiancheng Zhang Lijun Zhang Binhan Sun Shantung Tu Key Laboratory of Pressure Systems and Safety Ministry of Education School of Mechanical and Power Engineering East China University of Science and Technology Shanghai 200237 China School of Engineering Huzhou University Zhejiang 313000 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

来源：评论

学校读者我要写书评

暂无评论

面向地外建造的星壤基材料性能与表征（英文）

引用

Engineering 2024年第6期 159-181页

作者：周诚高玉月周燕佘伟史玉升丁烈云缪昌文 National Center of Technology Innovation for Digital Construction Huazhong University of Science and Technology School of Civil and Hydraulic Engineering Huazhong University of Science and Technology School of Materials Science and Engineering Southeast University State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology

The construction of extraterrestrial bases has become a new goal in the active exploration of deep *** the construction techniques, in situ resource-based construction is one of the most promising because of its good sustainability and acceptable economic cost, triggering the development of various types of extraterrestrial construction materials. A comprehensive survey and comparison of materials from the perspective of performance was conducted to provide suggestions for material selection and optimization. Thirteen types of typical construction materials are discussed in terms of their reliability and applicability in extreme extraterrestrial environment. Mechanical, thermal and optical, and radiation-shielding properties are considered. The influencing factors and optimization methods for these properties are analyzed. From the perspective of material properties, the existing challenges lie in the comprehensive, long-term, and real characterization of regolith-based construction ***, the suggested future directions include the application of high-throughput characterization methods, accelerated durability tests, and conducting extraterrestrial experiments.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Switching CO2Electroreduction toward C2+Products and CH4by Regulating the Dimerization and Protonation in Platinum/Copper Catalysts

引用

Angewandte Chemie 2025年

作者： Tailei Hou Jiexin Zhu Hongfei Gu Xinyuan Li Yiqing Sun Ze Hua Ruiwen Shao Cheng Chen Botao Hu Liqiang Mai Shenghua Chen Dingsheng Wang Jiatao Zhang Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications MOE Key Laboratory of Cluster Science MIIT Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering School of Chemistry and Chemical Engineering School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Chemistry National Innovation Platform (Center) for Industry-Education Integration of Energy Storage Technology Xi'an Jiaotong University Xi'an 710049 P. R. China Key Laboratory of Environmental Nanotechnology and Health Effects Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing 100094 P. R. China Department of Chemistry Tsinghua University Beijing 100084 China

Copper (Cu)-based catalysts exhibit distinctive performance in the electrochemical CO 2 reduction reaction (CO 2 RR) with complex mechanism and sophisticated types of products. The management of key intermediates *CO and *H is a necessary factor for achieving high product selectivity, but lack of efficient and versatile strategies. Herein, we designed Pt modified Cu catalysts to effectively modulate the competitive coverage of those intermediates. The Pt single-atoms and Pt nanoparticles modified Cu catalysts (denoted as Cu-Pt 1 and Cu-Pt NPs ) precisely regulated the protonation and dimerization, with the faradaic efficiency (FE) of C 2+ products up to 70.4 % and the FE of CH 4 reaching 57.7 %, respectively. CO stripping experiments reveal that Pt 1 sites could enhance the adsorption of *CO, while Pt NPs exhibit *CO tolerance for H 2 O dissociation. In situ spectroscopic results further confirms that high coverage of *CO is achieved on Cu-Pt 1 , while *CHO on Cu-Pt NPs might generate by additional water dissociation. As elucidated by theoretical studies, the interfacial sites of Cu-Pt 1 would favor the *CO coverage promoting the evolution of *OCCO for C 2+ products while Pt NPs supplementarily accelerate H 2 O dissociation achieving *CHO for CH 4 . This work provides insights for efficient and targeted CO 2 conversion by atomically design of active sites with engineered key intermediates coverage.

关键词： CO2 Electroreduction Platinum/Copper Catalysts key Intermediates Coverage Protonation and Dimerization

来源：评论

学校读者我要写书评

暂无评论

Sym- andAsym-Expanded Heterohelicene Isomers Featuring Extended Multi-Resonance Skeleton for Narrowband Deep-Blue Fluorescence

引用

Angewandte Chemie 2025年

作者： Dr. Xuan Zeng Xiaofeng Luo Dr. Guoyun Meng Prof. Xuewen Wang Dr. Dongdong Zhang Prof. Lian Duan School of Chemistry Chemical Engineering and Life Science State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 P. R. China These authors contributed equally to this work Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan 528200 P. R. China Center for Flexible Electronics Technology Tsinghua University Beijing 100084 P. R. China

Expanded heterohelicenes composed of alternating linearly and angularly fused multi-resonance (MR) skeletons have gained wide interest owing to their promising narrowband emissions. Herein, a pair of sym - and asym -expanded heterohelicene isomers was obtained by merging boron/oxygen (B/O)-embedded MR triangulene and indolo[3,2,1- jk ]carbazole units via one-pot synthesis. Owing to their fully resonating extended helical skeleton, the target heterohelicenes exhibit a significantly narrowed spectra bandwidth while emission red-shifting, thus affording deep-blue narrowband emission with a peak at approximately 460 nm, full-width-at-half-maximum (FWHM) of only 18 nm, and near-unity photoluminescence quantum yields. In comparison to the symmetrical structure, the asym -expanded heterohelicene displays suppressed aggregation within doped films, thereby showing superior narrowband electroluminescence in devices with CIE coordinates of (0.12, 0.18) and a high external quantum efficiency of up to 25 %, which retains 18.1 % even at a high luminance of 10,000 cd m −1 . Overall, this work provides a novel paradigm for the development of narrowband expanded heterohelicenes.

关键词： multiple resonance expanded helicene asymmetrical heterohelicene narrowband emission spectral broadening

来源：评论

学校读者我要写书评

暂无评论

Reconfiguring the Hydrogen Networks of Aqueous Electrolyte to Stabilize Iron Hexacyanoferrate for High-Voltage pH-Decoupled Cell

引用

Angewandte Chemie 2024年第42期136卷

作者： Zi-Long Xie Prof. Yunhai Zhu Jia-Yi Du Dong-Yue Yang Ning Zhang Qi-Qi Sun Prof. Gang Huang Prof. Xin-Bo Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China School of Applied Chemistry and Engineering University of Science and Technology of China Hefei 230026 China These authors contributed equally State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan 430200 China

Prussian blue analogs (PBAs) are promising insertion-type cathode materials for different types of aqueous batteries, capable of accommodating metal or non-metal ions. However, their practical application is hindered by their susceptibility to dissolution, which leads to a shortened lifespan. Herein, we have revealed that the dissolution of PBAs primarily originates from the locally elevated pH of electrolytes, which is caused by the proton co-insertion during discharge. To address this issue, the water-locking strategy has been implemented, which interrupts the generation and Grotthuss diffusion of protons by breaking the well-connected hydrogen bonding network in aqueous electrolytes. As a result, the hybrid electrolyte enables the iron hexacyanoferrate to endure over 1000 cycles at a 1 C rate and supports a high-voltage pH-decoupled cell with an average voltage of 1.95 V. These findings provide insights for mitigating the dissolution of electrode materials, thereby enhancing the viability and performance of aqueous batteries.

关键词： Aqueous battery Prussian blue analog dissolution Hydrogen bonds Electrochemistry

来源：评论

学校读者我要写书评

暂无评论

Grain-Boundary-Activity Correlation for Electrocatalytic Oxygen Evolution in High-Entropy Alloys

引用

PRX Energy 2023年第3期2卷 033011-033011页

作者： Tao Zhang Niu Gao Zheng-Jie Chen Hui-Feng Zhao Ya-Song Wang Jun-Qing Yao Jing Peng Yuan-Miao Sun Hai-Bin Yu Xin-Wang Liu Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Shenzhen Key Laboratory of Energy Materials for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China

High-entropy alloys (HEAs) have emerged as a promising platform for designing efficient electrocatalysts; however, the relationship between their structure and activity has not yet been clearly established. In particular, the influences of crystalline defects, such as grain boundaries (GBs), on activity and stability remain unclear. This study demonstrates the impacts of GBs on the oxygen evolution reaction (OER) activity in the FeCoCrNi HEA. We observe a logarithmic dependence of OER performance on mean grain size, spanning 3 orders of magnitude, as measured by evaluators like overpotential and Tafel slope. Spatially resolved microscopic imaging of activated samples indicates that the GBs undergo substantial reconstructions and they are enriched with the in situ formed metal oxides (M-O, M = Fe, Co, Ni) and the amorphous regions. By comparing with simple metals, we reveal a “high-entropy effect,” i.e., HEAs exhibit greater tolerance towards the grain refinements, which explains their activity both in bulk samples and nanoparticles. These findings offer physics-informed strategies for developing HEA electrocatalysis.

关键词： Energy materials Grain boundaries Disordered alloys

来源：评论

学校读者我要写书评

暂无评论

Effect of twin boundaries on the strength of body-centered cubic tungsten nanowires

arXiv

引用

arXiv 2022年

作者： Cui, Junfeng Ma, Liang Chen, Guoxin Jiang, Nan Ke, Peiling Yang, Yingying Wang, Shiliang Nishimura, Kazuhito Llorca, Javier Key Laboratory of Marine Materials and Related Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and Devices Central South University Changsha410083 China School of Physics and Optoelectronic Engineering Shandong University of Technology Zibo255000 China Advanced Nano-Processing Engineering Lab Mechanical Engineering Kogakuin University Tokyo192-0015 Japan IMDEA Materials Institute C/Eric Kandel 2 Getafe Madrid28906 Spain Department of Materials Science Polytechnic University of Madrid E.T.S. de Ingenieros de Caminos Madrid28040 Spain

Twin boundaries (TBs) are assumed to be obstacles to dislocation motion and increase the strength of metals. Here, we report the abnormal phenomenon that TBs reduce the strength of body-centered cubic (BCC) tungsten (W). [1-11]-oriented W nanowires with (121) twin planes and free of dislocations were fabricated by chemical vapor deposition. In situ tensile tests within the transmission electron microscope were performed on single-crystal and twinned W nanowires. The fracture strength of the twinned W nanowire was 13.7 GPa, 16% lower than that of the single-crystal W nanowire (16.3 GPa). The weakening mechanism of the TB was revealed by a combination of atomic-resolution characterizations and atomistic simulations. Twinned W nanowires failed by the early nucleation of a crack at the intersection of the TB with the surface. The standard strengthening mechanism by dislocation/TB interaction was not operative in W because the high Peierls barrier and stacking fault energy in W hinder dislocation nucleation and glide. These findings provide a new insight into the influence of TBs on the mechanical properties of BCC metals. © 2022, CC BY-NC-SA.

关键词： Nanowires

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：