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Crystallographically vacancy‐induced MOF nanosheet as rational single‐atom support for accelerating CO_(2) electroreduction to CO

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Carbon Energy 2024年第8期6卷 49-62页

作者： Jin Hyuk Cho Joonhee Ma Chaehyeon Lee Jin Wook Lim Youngho Kim Ho Yeon Jang Jaehyun Kim Myung‐gi Seo Youngheon Choi Youn Jeong Jang Sang Hyun Ahn Ho Won Jang Seoin Back Jong‐Lam Lee Soo Young Kim Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea Lotte Chemical R&D Center DaejeonRepublic of Korea Department of Chemical Engineering Hanyang UniversitySeoulRepublic of Korea School of Chemical Engineering and Material Science Chung‐Ang UniversitySeoulRepublic of Korea

To attain a circular carbon economy and resolve CO_(2) electroreduction technology obstacles,single‐atom catalysts(SACs)have emerged as a logical option for electrocatalysis because of their extraordinary catalytic *** SACs,metal–organic frameworks(MOFs)have been recognized as promising support materials because of their exceptional ability to prevent metal *** study shows that atomically dispersed Ni single atoms on a precisely engineered MOF nanosheet display a high Faradaic efficiency of approximately 100% for CO formation in H‐cell and three‐compartment microfluidic flow‐cell reactors and an excellent turnover frequency of 23,699 h^(−1),validating their intrinsic catalytic *** results suggest that crystallographic variations affect the abundant vacancy sites on the MOF nanosheets,which are linked to the evaporation of Zn‐containing organic linkers during ***,using X‐ray absorption spectroscopy and density functional theory calculations,a comprehensive investigation of the unsaturated atomic coordination environments and the underlying mechanism involving CO^(*) preadsorbed sites as initial states was possible and provided valuable insights.

关键词： 2‐dimensional material carbon dioxide reduction metal-organic frameworks single‐atom catalysts vacancy sites

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Recent Advances of Metal-Organic Frameworks and Derivatives for Rechargeable Aluminum Batteries

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SusMat 2025年第1期5卷 38-58页

作者： Dan-Yang Wang Hong-Han Choo Erhai Hu Jinxuan Song Afriyanti Sumboja Ivandini T.Anggraningrum Anne Zulfia Syahrial Qingyu Yan School of Material Science and Engineering Nanyang Technological UniversitySingaporeSingapore Material Science and Engineering Research Group Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungBandungIndonesia Department of Chemistry University of IndonesiaDepokIndonesia Metallurgical&Materials Engineering Department Fakultas Teknik Universitas IndonesiaKampus UIDepokIndonesia

In light of cost-effectiveness,high volumetric capacity,and abundant supplies on Earth of aluminum metal,the rechargeable aluminum battery(RAB)represents a cutting-edge alternative for energy storage *** have achieved significant progress as a result of tireless efforts;however,challenges like as expensive ionic liquid electrolytes,a restricted voltage window of aqueous electrolytes,corroded anode,and rapid capacity degradation limit their practical *** terms of increasing RABmileage,electrode materials can be regarded as the foundation of battery ***-organic frameworks(MOFs),which have customizable topologies,multiple active sites,and various metal centers and ligands,are promising electrode ***,for the first time,we deliver in detail the recent advancement ofMOFs in *** relationship on structure-properties-performance of MOFs is thoroughly *** and MOF-derived electrode materials are first *** aluminum sulfur/selenium batteries,MOF can serve as a host to capture the sulfides or ***,the MOF as catalysts for aluminum-air batteries are *** we focused on the challenges and opportunities that RABs would face in the future,and some prospects are *** believe this account will facilitate the exploration of MOFs in RABs and give more inspiration for discovering advanced RABs.

关键词： aluminum batteries metal-organic frameworks performance structures

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THz generation by non-linear mixing of laser and its second order harmonic on CNT array inlaid over dielectric substrate

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Optical and Quantum Electronics 2025年第1期57卷 1-12页

作者： Juneja, Himani Panwar, Anuraj Chauhan, Prashant Department of Physics and Material Science and Engineering Jaypee Institute of Information Technology UP Noida India

A network of CNTs embedded on a dielectric substrate is used to transmit two laser beams with frequencies ω1 and ω2 and wave vectors k1 and k2 respectively. These laser pulses cause a localized plasma to develop when they contact with nanotubes. As a result, electrons develop oscillatory velocities. By applying ponderomotive pressure to the electrons, it causes oscillations in the charge density at 2ω1 and ω1-ω2 frequencies. At the frequency 2ω1-ω2, which is in the terahertz (THz) region, the laser exerts a ponderomotive force on the free electrons of carbon nanotubes causing a nonlinear current density. Each nanotube functions as an oscillating electric dipole that emits THz radiation. We establish the governing equation for THz efficiency and its dependence on laser incidence angle, amplitude, nanotube size, and CNT spacing. We obtain maximum peak of THz power at incident angle θ0≈23.5∘. The terahertz power of carbon nanotubes is highly dependent on their radius and length, so as these parameters increase, their terahertz power increases as well. Whereas on decreasing separation between the nanotubes, THz efficiency increases. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2024.

关键词： Laser beams

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Silicon Manganese Slag as Supplementary Cementitious material in Low Carbon Composite Mortar 15th

Silicon Manganese Slag as Supplementary Cementitious Materia...

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15th fib International PhD Symposium in Civil engineering, 2024

作者： Hettiarachchi, Dileepa Samarakoon, S. M. Samindi M. K. Fosså, Kjell Tore Gebremariam, Kidane F. Khalifeh, Mahmoud Department of Structural and Mechanical Engineering and Material science University of Stavanger Norway Museum of Archaeology Department of Conservation University of Stavanger Norway Department of Energy and Petroleum Engineering University of Stavanger Norway

ISBN: (纸本)9782940643240

Mitigation of CO2 emissions linked to cement production stands as a critical issue, achievable through the integration of supplementary cementitious materials (SCMs). This strategy gains particular efficacy when utilizing locally accessible waste or by-product materials sourced from diverse industries. Silicon manganese (SiMn) slag, a by-product of the silicomanganese alloy manufacturing process, emerges as a promising supplementary cementitious material with optimum replacement to produce low carbon concrete mortar. An experimental campaign was conducted to replace cement in mortar with varying percentages of SiMn slag ranging from 30% up to 90% by weight of cement. The water to binder ratio was maintained at 0.35, supplemented with an admixture at 1.0% by weight of the total binder, to enhance its workability. Properties such as compressive strength (so far measured at 3, 7 and 28 days) and autogenous shrinkage were evaluated. Microstructure analysis, utilizing SEM and XRD methods, was carried out to identify phases and reaction products within the hardened mortar. Results indicated that mortars containing 30% to 50% of SiMn slag achieve comparable strength characteristics to that of control specimens. The study suggests that the SiMn slag used in this experiment is effective in achieving higher cement replacement rates. Hence, this has the potential to reduce the overall carbon footprint of the built environment and contribute to the sustainability of the cement industry. © Fédération Internationale du Béton–International Federation for structural Concrete.

关键词： Slags

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New light fields based on integration theory within the Weyl ordering product of operators

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Chinese Physics B 2023年第4期32卷 160-164页

作者：张科李兰兰郭大伟范洪义 School of Electronic Engineering Huainan Normal UniversityHuainan 232038China Department of Material Science and Engineering University of Science and Technology of ChinaHefei 230026China

The development of quantum optics theory based on the method of integration within an ordered product of operators(IWOP)has greatly stimulated the study of quantum states in the light field,especially non-Gaussian states with various non-classical *** this paper,the two-mode squeezing operator is derived with integral theory within the Weyl ordering product of operators using a combinatorial field in which one mode is a chaotic field and the other mode is a vacuum *** density operator of the new light field,its entanglement property and photon number distribution are *** also note that tracing a three-mode pure state can yield this new light *** methods represent a theoretical approach to investigating new density operators of light fields.

关键词： integration within an ordered product of operators two-mode squeezing operator Weyl ordering entanglement property

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Seismic control of multi-degrees-of-freedom structures by vertical mass isolation method using MR dampers

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Earthquake engineering and engineering Vibration 2024年第2期23卷 503-510页

作者： Mohamad Shahrokh Abdi Masoud Nekooei Mohammad-Ali Jafari Department of Civil Engineering Marivan BranchIslamic Azad UniversityMarivan ***Iran Department of Civil Engineering Science and Research BranchIslamic Azad UniversityTehran ***Iran Structural Department of Transmission and Distribution Research Center Niroo Research Institute(NRI)Tehran ***Iran

Vertical mass isolation(VMI)is one of the novel methods for the seismic control of *** this method,the entire structure is assumed to consist of two mass and stiffness subsystems,and an isolated layer is located among *** this study,the magnetorheological damper in three modes:passive-off,passive-on,and semi-active mode with variable voltage between zero and 9 volts was used as an isolated layer between two ***-degrees-of-freedom structures with 5,10,and 15 floors in two dimensions were examined under 11 pairs of near field *** each level,the displacement of MR dampers was taken into *** responses of maximum displacement,maximum inter-story drift,and maximum base shear in controlled and uncontrolled buildings were compared to assess the suggested approach for seismic control of the *** to the results,the semi-active control method can reduce the response by more than 12%compared to the uncontrolled mode in terms of maximum displacement of the mass subsystem of the *** method can reduce more than 16%and 20%of the responses compared to the uncontrolled mode in terms of maximum inter-story drift and base shear of the structure,respectively.

关键词： seismic control vertical mass isolation base shear magnetorheological damper semi-active control

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Investigation of oxidative potential of fresh and O_(3)-aging PM_(2.5)from various emission sources across urban and rural regions

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Journal of Environmental sciences 2025年第5期151卷 608-615页

作者： Shuaishuai Ma Dongsheng Cheng Yingying Tang Younuo Fan Qiong Li Chengxiang He Zhiqing Zhao Tianyou Xu College of Chemical and Material Engineering Quzhou UniversityQuzhou 324000China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science&EngineeringFudan UniversityShanghai 200433China

Inhalation of atmospheric PM_(2.5)can induce the generation of excessive reactive oxygen species(ROS)in human alveoli,triggering local and systemic inflammation,which can directly or indirectly result in respiratory and cardiovascular *** this study,we assessed the oxidative potential(OP)of fresh and O_(3)-aged PM_(2.5)particles from various urban and rural emission sources using the dithiothreitol(DTT)*** results revealed variations in the OP of fresh PM_(2.5)among different emission sources,with biomass burning sources exhibiting the highest OP,followed by industrial areas,vehicular emissions,cooking emissions,and suburban areas,***-soluble organics and transition metals might potentially exert significant influence on particle OP.O_(3)aging notably decreased the OP of PM_(2.5)particles,possibly due to the oxidation of highly DTT-active components into low redox-active small ***,the evolution of OP in different PM_(2.5)components,including methanol-soluble and insoluble fractions,exhibited distinct responses to O_(3)aging for source-oriented PM_(2.5).Additionally,differences in chemical composition between fresh and aged PM_(2.5)were further elucidated through measurements of component-dependent hygroscopic behaviors and phase *** study systematically delineates variances in the toxic potential of fresh and O_(3)-aged PM_(2.5)from various anthropogenic *** findings highlight the intrinsic compositional dependence of particle OP and provide essential insights for assessing the health effects of source-oriented PM_(2.5),as well as for formulating human health protection policies.

关键词： Atmospheric PM_(2.5) Oxidative potential Emission sources DTT assay O_(3)aging

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Beyond p-y method:A review of artificial intelligence approaches for predicting lateral capacity of drilled shafts in clayey soils

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Journal of Rock Mechanics and Geotechnical engineering 2024年第9期16卷 3812-3840页

作者： M.E.Al-Atroush A.E.Aboelela Ezz El-Din Hemdan Civil and Environmental Engineering Program Engineering Management DepartmentCollege of EngineeringPrince Sultan UniversityRiyadhSaudi Arabia Department of Structural Engineering Faculty of EngineeringAin Shams UniversityCairoEgypt Structure and Materials Research Lab Prince Sultan UniversityRiyadhSaudi Arabia Computer Science and Engineering Department Faculty of Electronic EngineeringMenoufia UniversityMenoufiaEgypt

In 2023,pivotal advancements in artificial intelligence(AI)have significantly *** that in mind,traditional methodologies,notably the p-y approach,have struggled to accurately model the complex,nonlinear soil-structure interactions of laterally loaded large-diameter drilled *** study undertakes a rigorous evaluation of machine learning(ML)and deep learning(DL)techniques,offering a comprehensive review of their application in addressing this geotechnical challenge.A thorough review and comparative analysis have been carried out to investigate various AI models such as artificial neural networks(ANNs),relevance vector machines(RVMs),and least squares support vector machines(LSSVMs).It was found that despite ML approaches outperforming classic methods in predicting the lateral behavior of piles,their‘black box'nature and reliance only on a data-driven approach made their results showcase statistical robustness rather than clear geotechnical insights,a fact underscored by the mathematical equations derived from these ***,the research identified a gap in the availability of drilled shaft datasets,limiting the extendibility of current findings to large-diameter *** extensive dataset,compiled from a series of lateral loading tests on free-head drilled shaft with varying properties and geometries,was introduced to bridge this *** paper concluded with a direction for future research,proposes the integration of physics-informed neural networks(PINNs),combining data-driven models with fundamental geotechnical principles to improve both the interpretability and predictive accuracy of AI applications in geotechnical engineering,marking a novel contribution to the field.

关键词： Laterally loaded drilled shaft load transfer and failure mechanisms Physics-informed neural networks(PINNs) P-y curves Artificial intelligence(AI) Dataset

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Experimental and numerical behavior of strengthened reinforced concrete slabs

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Journal of engineering and Applied science 2025年第1期72卷 1-21页

作者： Hamdy, Abdelrhman Emad Abdalla, Hany Ahmed Abdelhamed, Ghada Diaa Elansary, Ahmed Alaa Lecturer Assistant Faculty of Engineering Ahram Canadian University Giza12451 Egypt Department of Structural Engineering Faculty of Engineering Cairo University Giza12613 Egypt Housing and Building National Research Center Giza12622 Egypt Department of Civil Engineering Faculty of Engineering and Material Science German University in Cairo New Cairo City11835 Egypt Department of Civil and Environmental Engineering The University of Western Ontario LondonONN6A3K7 Canada

In terms of the importance of establishing mega structures in Egypt, there is an increasing demand to strengthen their slabs. Accordingly, this research was initiated with the objective of assessing different strengthening techniques (strengthening by concrete jacket or strips of carbon fiber reinforced polymer "CFRP"), where a multi-disciplinary approach was employed. Principally, literature within the domain of slab strengthening was amassed and scrutinized. An experimental work was conducted to examine 5 specimens of slabs under 4-point loadings. Crack patterns, midspan deflections, and steel strains were designated, where load–deflection curves and load-strain curves were produced. Moreover, the experimental investigation was replicated numerically by ABAQUS. Experimental and numerical results were contrasted, from which it was apparent that their results provided comparable trends. Confident with this contrasting process, a parametric study was achieved by ABAQUS, where 54 specimens with various parameters were investigated. Results showed that strengthening with RC jacketing and CFRP strips enhanced the load capacity and initial stiffness while decreasing the ductility for RC slabs. In addition, various jacketing bar and CFRP properties changes showed significant enhancement in the behavior of strengthened slabs. The numerical results showed enhancement in the load capacity of strengthened specimens due to the increase in the jacketing yield strength, bar diameter, and the jacketing concrete compressive strength. Increasing the number of CFRP strips enhanced the performance of the strengthened slab specimens by 14.2% ~ 25.1%. © The Author(s) 2025.

关键词： Concrete slabs

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Rheological Characteristics of Al2O3-TiO2 Composite Inks for Direct Ink Writing 2nd

Rheological Characteristics of Al2O3-TiO2 Composite Inks for...

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2nd International Conference on Mechanical engineering, INCOM 2024

作者： Pal, Pinaki Rupa, P. Karuna Purnapu Department of Material Science and Engineering Tripura University Agartala India

ISBN: (纸本)9789819772957

Methylcellulose-based alumina-titania composite (97:3 wt.%) inks were prepared by mixing 1 wt.% and 3 wt.% methylcellulose solution with 35 wt.%, 50 wt.%, and 65 wt.% of solid loading to obtain alumina-titania composite inks. The prepared inks were characterized for rheological behavior. Significant effect of solid loading of alumina-titania composite powder was observed on the viscosity of the alumina-titania composite inks. The viscosity of the composite inks increased with increased solid loading. Also, it was observed that the gelation temperature decreased with increasing solid loading of alumina-titania composite powder in the composite inks. The viscosity vs shear rate for the composite inks showed shear thinning behavior which is suitable for direct ink writing. The yield stress of the composite inks was found to increase significantly with increasing solid content at 35 °C. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Shear thinning

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