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Dynamic boron-carbamate bonds cross-link polyurea elastomers with enhanced impact-resistant properties

Progress in Organic Coatings 2025年 207卷

作者： Wang, Sibo Chen, Rongrong Liu, Peili Yu, Jing Liu, Qi Liu, Jingyuan Zhu, Jiahui Wang, Jun Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China Yangtze Delta Region Advanced Research Institute of Harbin Engineering University Nantong226000 China

Polyurea is widely used in infrastructure protection because of its significant mechanical properties, excellent toughness, and rapid curing performance. However, developing a high-strength polyurea with a rapid impact response remains challenging. Here, dynamic boron-carbamate bonds are integrated with polyurea elastomers (BxPU) by cross-linking a mixture of diisocyanate and aniline-terminated polyether with boric acid to achieve enhanced mechanical strength and toughness. Polyurea elastomer (B3PU) exhibits superior mechanical performance, attributed to the synergistic effect of reversible boron-carbamate bonds and hydrogen bonds, with an ultimate strength of 53.8 MPa, a tensile strain of 738.8 %, and a toughness of 240.9 ± 26.4 MJ m−3. Additionally, the experimental and simulation results demonstrate that the BxPU elastomers exhibit fast responsiveness, excellent impact resistance, and protective performance. Collectively, this study highlights a facile method for developing high-strength polyurea elastomers with enhanced impact resistance, providing a new choice for explosion protection and building longevity. © 2025 Elsevier B.V.

关键词： Tensile strain

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Carbon Quantum Dots Doped Ni3se4/Co9se8/Fe3o4 Multilayer Nanosheets Prepared by One-Step Solvothermal Method to Boost Electrocatalytic Oxygen Evolution

SSRN

引用

SSRN 2022年

作者： Zhang, Yao Wang, Runze Zhu, Longqi Li, Xu Sun, Caixia Liu, Haizhen Zhu, Lei Wang, Kuikui Institute of Materials for Energy and Environment Laboratory of New Fiber Materials and Modern Textile Growing Basis for State Key Laboratory College of Materials Science and Engineering Qingdao University Qingdao266071 China College of Basic Medical Qingdao Binhai University Qingdao266555 China Material Corrosion and Protection Key Laboratory of Sichuan province Zigong643000 China Key Laboratory of New Metallic Functional Materials and Advanced Surface Engineering in Universities of Shandong School of Mechanical and Electronic Engineering Qingdao Binhai University Shandong Qingdao266555 China MOE Key Laboratory of New Processing Technology for Non-ferrousMetals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Guangxi University Guangxi Nanning530004 China

Oxygen evolution reaction is a momentous part of electrochemical energy storage and conversion devices such as rechargeable metal-air batteries. It is particularly urgent to develop low-cost and efficient electrocatalysts for oxygen evolution reactions. As a potential substitute for noble metal electrocatalysts, transition metal selenides are still challenging in improving the activity of oxygen evolution reaction and the research of reaction intermediates. In this study, a simple one-step solvothermal method was used to prepare a polymetallic compound carbon matrix composite (Co 9 Se 8 /Ni 3 Se 4 /Fe 3 O 4 @C) with a multilayered nanosheet structure. It exhibited good OER activity in an alkaline electrolyte solution with an overpotential of 252 mV at 10 mA/cm 2 and a Tafel slope of 123 mV/dec in an alkaline medium. Besides, this catalyst also showed excellent performance in the 8 hours stability test. The composite presents a multi-layer sheet structure, which effectively improves the contact between the active site and the electrolyte. The selenide formed by Ni and Co has a synergistic effect and improves the electrochemical performance together. The participation of Fe 3 O 4 reduces the bond energy of the intermediate oxygen evolution reaction. In addition, carbon quantum dots have rich heteroatoms and electron transferability, which improves the electrochemical properties of the composites. This work provides a new strategy for the preparation of highly efficient OER electrocatalysts utilizing the multimetal synergistic effect. © 2022, The Authors. All rights reserved.

关键词： Semiconductor quantum dots

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Centimeter-Sized Single Crystal of Two-Dimensional Halide Perovskites Incorporating Straight-Chain Symmetric Diammonium Ion for X-Ray Detection

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Angewandte Chemie 2020年第35期132卷 15006-15012页

作者： Shen Y. Liu Y. Ye H. Zheng Y. Wei Q. Xia Y. Chen Y. Zhao K. Huang W. Liu S. Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM) Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (Nanjing Tech) 30 South Puzhu Road Nanjing 211816 China MIIT Key Laboratory of Flexible Electronics (KLoFE) Key Laboratory of Flexible Electronics (KLoFE) Xi'an Key Laboratory of Flexible Electronics (KLoFE) Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Northwestern Polytechnical University Xi'an Shaanxi 710072 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China University of the Chinese Academy of Sciences Beijing 100039 China

Two-dimensional (2D) AA′n−1MnX3n+1 type halide perovskites incorporating straight-chain symmetric diammonium cations define a new type of structure, but their optoelectronic properties are largely unexplored. Reported here is the synthesis of a centimeter-sized AA′n−1MnX3n+1 type perovskite, BDAPbI4 (BDA=NH3C4H8NH3), single crystal and its charge-transport properties under X-ray excitation. The crystal shows a staggered configuration of the [PbI6]4− layers, a band gap of 2.37 eV, and a low trap density of 3.1×109 cm−3. The single-crystal X-ray detector exhibits an excellent sensitivity of 242 μC Gyair−1 cm−2 under the 10 V bias (0.31 V μm−1), a detection limit as low as 430 nGyair s−1, ultrastable response current, a stable baseline with the lowest dark current drift of 6.06×10−9 nA cm−1 s−1 V−1, and rapid response time of τrise=7.3 ms and τfall=22.5 ms. These crystals are promising candidates for the next generation of optoelectronic devices. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： crystal growth optoelectronics perovskite solid-state structures X-ray detection

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Contractive Unitary and Classical Shadow Tomography

arXiv

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arXiv 2024年

作者： Wu, Yadong Wang, Ce Yao, Juan Zhai, Hui You, Yi-Zhuang Zhang, Pengfei College of Physics Sichuan University Chengdu610065 China Department of Physics Hong Kong Institute of Quantum Science and Technology The University of Hong Kong Pokfulam Road Hong Kong School of Physics Science and Engineering Tongji University Shanghai200092 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China International Quantum Academy Guangdong Shenzhen518048 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China Institute for Advanced Study Tsinghua University Beijing100084 China Hefei National Laboratory Hefei230088 China Department of Physics University of California at San Diego La Jolla CA92093 United States Department of Physics State Key Laboratory of Surface Physics Fudan University Shanghai200438 China Shanghai Qi Zhi Institute AI Tower Xuhui District Shanghai200232 China

The rapid development of quantum technology demands efficient characterization of complex quantum many-body states. However, full quantum state tomography requires an exponential number of measurements in system size, preventing its practical use in large-scale quantum devices. A major recent breakthrough in this direction, called classical shadow tomography, significantly reduces the sample complexity, the number of samples needed to estimate properties of a state, by implementing random Clifford rotations before measurements. Despite many recent efforts, reducing the sample complexity below 2k for extracting any non-successive local operators with a size ∼ k remains a challenge. In this work, we achieve a significantly smaller sample complexity of ∼ 1.8k using a protocol that hybridizes locally random and globally deterministic unitary operations. The key insight is the discovery of a deterministic global unitary, termed as contractive unitary, which is more efficient in reducing the operator size to enhance tomography efficiency. The contractive unitary perfectly matches the advantages of the atom array quantum computation platform and is readily realized in the atom array quantum processor. More importantly, it highlights a new strategy in classical shadow tomography, demonstrating that a random-deterministic hybridized protocol can be more efficient than fully random measurements. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum computers

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Roof greening in major Chinese cities possibly afford a large potential carbon sink

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Science Bulletin 2024年第20期69卷 3216-3220页

作者： Chao Yang Yinghui Zhang Min Chen Song Zhu Yuzhi Tang Zhixin Zhang Wei Ma Huizeng Liu Junyi Chen Bohui Tang Dejin Zhang Zhengdong Huang Xuqing Wang Wei Tu Cuiling Liu Tiezhu Shi Haiying Xu Aihong Cui Fanyi Meng Tianhong Zhao Kai Guo Wenhao Guo Bi Fan Quande Qin Wuyang Hong Haishan Wu Bing Wang Jinrong Zeng Ka Wai Wu Qingquan Li Key Laboratory for Geo-Environmental Monitoring of Great Bay Area Ministry of Natural Resources&Guangdong Key Laboratory of Urban InformaticsShenzhen UniversityShenzhen 518060China School of Architecture and Urban Planning Shenzhen UniversityShenzhen 518060China Key Laboratory of Virtual Geographic Environment Ministry of EducationNanjing Normal UniversityNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China International Research Center of Big Data for Sustainable Development Goals Beijing 100094China Shenzhen Zhiyuan Space Innovation Technology Co. LtdShenzhen 518060China Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ) Shenzhen 518107China School of Geography and Ocean Science Nanjing UniversityNanjing 210008China School of Geography Nanjing Normal UniversityNanjing 210023China School of Civil Engineering Chongqing Jiaotong UniversityChongqing 400074China Institute for Advanced Study&Shenzhen University Shenzhen 518060China Tiandu-Shenzhen University Deep Space Joint Laboratory Shenzhen UniversityShenzhen 518060China Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming 650093China Center for Hydrogeology and Environmental Geology China Geological SurveyBaoding 071051China Department of Landscape Architecture and Urban Planning Texas A&M UniversityTX 77840USA Department of Geography Hong Kong Baptist UniversityHong Kong 999077China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China College of Big Data and Internet Shenzhen Technology UniversityShenzhen 518118China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China College of Management Shenzhen UniversityShenzhen 518060China WeBank(Shenzhen)Co. LtdShenzhen 518060China Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityHong Kong 100872China Esri C

China is experiencing accelerated urbanisation,with a large number of people moving from rural to urban areas[1].It has resulted in large losses in the net primary production(NPP),biodiversity and carbon stocks and an increase in environmental pollution and CO_(2)emissions[2–4].In 2015,196 countries signed the Paris Agreement and committed to setting long-term goals to jointly manage climate change and reduce their individual emissions,aiming to control the increase in global average temperature from the pre-industrial level to below 2℃and to curtail the temperature rise within 1.5℃till the end of the 21st century[5].China is bolstering its efforts to achieve the climate change mitigation goals and has announced a plan for achieving carbon neutrality by 2060[6].The carbon neutrality goal poses a challenge to the current policies promoting rapid urbanisation across China.

关键词： jointly carbon goals

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MoO 3 -MoC/ [email protected] coupled heterostructures with strong connections and abundant interfaces for electromagnetic wave absorption

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Colloids and surfaces A: Physicochemical and engineering Aspects 2023年 668卷

作者： Yichao Yin Xiaojun Zeng Lei Xia Guangjie Xiong Hang Zhang Guoke Wei Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing 100024 China School of Materials Science and Engineering Jingdezhen Ceramic University Jingdezhen 333403 China

Improving the electromagnetic wave (EMW) absorption capability at the thin thickness of heterostructures is critical but remains a great challenge. Here, we propose a MoO 3 @ZIF-67 core-shell heterostructure derived molybdenum trioxide- molybdenum carbide/ [email protected] carbon (MoO 3 -MoC/ [email protected] ) coupled heterostructure with a one-dimensional (1D) short rod-like structure for EMW absorption. A strong connection is constructed between [email protected] nanoparticles (NPs) and MoO 3 -MoC specie due to the pyrolysis strategy and in situ reaction between MoO 3 nanobelts and ZIF-67 rhombic dodecahedrons . The abundant heterointerfaces between N-doped carbon (NC) and metallic Co, [email protected] NPs and MoC species, [email protected] NPs and MoO 3 nanobelts, as well as MoC and MoO 3 nanobelts improve the interfacial polarization. Abundant defects, such as N heteroatoms and oxygen vacancies , are also established in the MoO 3 -MoC/ [email protected] coupled heterostructure. As a result, the MoO 3 -MoC/ [email protected] coupled heterostructure inherits excellent EMW absorption performance with a reflection loss ( R L ) value of − 64.3 dB at a thickness of 3.875 mm, outperforming many advanced EMW absorbers. This work shows the great potential of strong connections and abundant interfaces in heterostructure for improvements of EMW absorbers.

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Current progress in corrosion of multi principal element alloys

arXiv

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arXiv 2024年

作者： Ghorbani, M. Li, Z. Qiu, Y. Marcus, P. Scully, J.R. Gharbi, O. Luo, H. Gupta, R.K. Zeng, Z.R. Fraser, H.L. Taheri, M.L. Birbilis, N. Faculty of Science Engineering and the Built Environment Deakin University VIC Australia College of Engineering Computing and Cybernetics Australian National University ACT Australia Faculty of Materials Wuhan University of Science and Technology Wuhan China PSL University CNRS Chimie ParisTech Institut de Recherche de Chimie Paris Physical Chemistry of Surfaces Group Paris France Department of Materials Science and Engineering University of Virginia VA United States CNRS Sorbonne Université Laboratoire de Réactivité de Surface LRS Paris France National Materials Corrosion and Protection Data Center Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing China Department of Materials Science and Engineering North Carolina State University RaleighNC United States State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha China Department of Materials Science and Engineering The Ohio State University ColumbusOH United States Department of Materials Science and Engineering Johns Hopkins University BaltimoreMD United States

Whilst multi-principal element alloys (MPEAs) remain a promising class of materials owing to several attractive mechanical properties, their corrosion performance is also unique. In this concise review, we present an emerging overview of some of the general features related to MPEA corrosion, following a decade of work in the field. This includes highlighting some of the key aspects related to the electrochemical phenomena in MPEA corrosion, and the relevant future works required for a holistic mechanistic understanding. In addition, a comprehensive database of the reported corrosion performance of MPEAs is presented – based on works reported to date. The database is assembled to also allow users to undertake machine learning or their own data analysis, with a parsed representation of alloy composition, test electrolyte, and corrosion related parameters. © 2024, CC BY-NC-ND.

关键词： Database systems

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Effect of Hf addition on the microstructure and tensile properties at medium temperature of a cast superalloy K4222

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Materials Science and engineering: A 2025年

作者： Jiayue Wang Fan Lu Wendao Li Pinpin Hu Song Lu Chengbo Xiao School of Materials Science and Engineering Xiangtan University Xiangtan 411105 China Beijing Institute of Mechanical Equipment Beijing 100854 China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing 100095 China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

The influence of Hf on the microstructure and tensile properties at 760°C of the K4222 alloy was investigated. Thermodynamic calculations were performed for predicting the phase constituent, wherein the results indicated that increasing Hf content expanded the existing temperature range of the MC carbides, thus inhibiting their transformation to the M 23 C 6 carbides. Additionally, the addition of Hf promotes the formation of the Ni 5 Hf phase with low melting-point. In order to verify the calculated results, three experimental alloys distinguished by 0wt.%, 0.72wt.%, and 1.5wt.% Hf contents were prepared. Microstructural characterization for as-cast alloys showed that by the increasing Hf content the content of MC carbides increased, causing the formation of the (γ+Ni 5 Hf) eutectics, which can be essentially eliminated by the following heat-treatment process. Tensile testing results at 760°C showed that the addition of Hf can obviously improve the yield strength and ultimate tensile strength, but reduce the plasticity of the alloys. The reason lay in the fact that the addition of Hf affect the content and morphology of the MC carbides, suppressing the expansion of microcracks at grain boundaries (GBs) and altering the high-temperature fracture mechanism of the alloy. TEM results illustrated that the addition of Hf change the deformation mechanism of the alloys, but suppress the occurrence of stacking fault in the γ′ phases, suggesting a reduction of the stacking fault energy.

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Two dimensional metal halide perovskites: Promising candidates for light-emitting diodes

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Journal of Energy Chemistry 2019年第10期28卷 97-110页

作者： Lu Zhang Yucheng Liu Zhou Yang Shengzhong(Frank)Liu Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of EducationSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina Laboratory of Applied Surface and Colloid Chemistry National Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina iChEM Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Two dimensional halide perovskites are emerging as attractive electroluminescent materials for developing high-performance light-emitting devices owing to their unique structures and/or superior optoelectronic *** review begins with an introduction to the working principles of and the key figures for evaluating the performance of ***,the structure and optoelectronic properties of two dimensional perovskites are summarized and discussed. Their advantages in LED application over their 3D counterparts are systematically *** the theoretically discussion,the progresses on the preparation of two dimensional perovskite materials as well as their performances in LEDs have been summarized. At last,several challenges and prospects are presented for achieving high performance 2D perovskite-based LEDs.

关键词： Perovskite 2D LEDs External quantum efficiency

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Possible gapless quantum spin liquid behavior in the triangular-lattice Ising antiferromagnet PrMgAl11O19

arXiv

引用

arXiv 2024年

作者： Ma, Zhen Zheng, Shuhan Chen, Yingqi Xu, Ruokai Dong, Zhao-Yang Wang, Jinghui Du, Hong Embs, Jan Peter Li, Shuaiwei Li, Yao Zhang, Yongjun Liu, Meifeng Zhong, Ruidan Liu, Jun-Ming Wen, Jinsheng Hubei Key Laboratory of Photoelectric Materials and Devices School of Materials Science and Engineering Hubei Normal University Huangshi435002 China State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Department of Applied Physics Nanjing University of Science and Technology Nanjing210094 China ShanghaiTech Laboratory for Topological Physics School of Physical Science and Technology ShanghaiTech University Shanghai200031 China Tsung-Dao Lee Institute School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Laboratory for Neutron Scattering and Imaging Paul Scherrer Institut Villigen5232 Switzerland Tsung-Dao Lee Institute School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Quantum spin liquids (QSLs) represent a novel state where spins are highly entangled but do not order even at zero temperature due to strong quantum fluctuations. Such a state is mostly studied in Heisenberg models defined on geometrically frustrated lattices. Here, we turn to a new triangular-lattice antiferromagnet PrMgAl11O19, in which the interactions are believed to be of Ising type. Magnetic susceptibility measured with an external field along the c axis is two orders of magnitude larger than that with a field in the ab plane, displaying an ideal easy-axis behavior. Meanwhile, there is no magnetic phase transition or spin freezing observed down to 1.8 K. Ultralow-temperature specific heat measured down to 50 mK does not capture any phase transition either, but a hump at 4.5 K, below which the magnetic specific heat exhibits a quasi-quadratic temperature dependence that is consistent with a Dirac QSL state. Inelastic neutron scattering technique is also employed to elucidate the nature of its ground state. In the magnetic excitation spectra, there is a gapless broad continuum at the base temperature 55 mK, in favor of the realization of a gapless QSL. Our results provide a scarce example for the QSL behaviors observed in an Ising-type magnet, which can serve as a promising platform for future research on QSL physics based on an Ising model. Copyright © 2024, The Authors. All rights reserved.

关键词： Ground state

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