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SSRN 2022年

作者： Wang, Songwang Yang, Ruoou Lu, Guangduo Yi, Lizhi Liu, Min Xu, Yunli Pan, Liqing Hubei Engineering Research Center of Weak Magnetic-field Detection College of Science China Three Gorges University Yichang443002 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Shanghai Synchrotron Radiation Facility Zhangjiang National Lab Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201204 China

The crystal structure, atomic occupation, martensitic transformation and dynamic magnetic properties of Ni43Co7Mn39-xCrxSn11(x=0, 0.4, 0.6, 0.8, 1.0, 1.2 at.%) alloys have been systematically investigated. To elucidate the occupancy of Cr atoms, extended X-ray absorption fine structure (EXAFS) was performed on the Ni43Co7Mn38Cr1Sn11 sample. Cr K-edge EXAFS analysis confirmed that Cr atoms occupy Y site. Magnetic measurements showed that with the increase of Cr content, the martensitic transformation temperature increases slightly from 336 K to 339 K at first, and then rapidly decreases to 246 K, while the saturation magnetization decreases slightly. Ferromagnetic resonance results revealed that with the doping of Cr, the orbital angular momentum of the Mn atoms at Z site is partially activated, resulting in the effective Landé g factor of the alloy increasing from 2.05 to 2.19. Meanwhile the magnetic moments of Mn atoms at Z site increase, resulting in a decrease in the saturation magnetization of the alloy. The results indicated that in the 43Co7Mn39Sn11 system, Cr doping replaces Mn at Y site, breaks the symmetry of the crystal field of the Mn atoms at Z site, enlarges its magnetic moment, and effectively regulates the martensitic transformation temperature of the alloy as well. The most important effect is that Cr doping can significantly enhance the magnetic driving force and greatly promote the magnetic field-induced martensitic transformation. © 2022, The Authors. All rights reserved.

关键词： Ferromagnetism

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Ordered Mesoporous Tio2 Framework Confined Cesn Catalyst Exhibiting Excellent High Activity for Selective Catalytic Reduction of No with Nh3 at Low Temperature

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SSRN 2022年

作者： Mu, Yibo Huang, Xiaosheng Zhicheng, Tang Wang, Qingchun State Key Laboratory for Oxo Synthesis and Selective Oxidation National Engineering Research Center for Fine Petrochemical Intermediates Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China College of Materials and Metallurgical Engineering Inner Mongolia University of Science and Technology Baotou014010 China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Yantai264006 China

synthesis of the cerium-based catalyst with excellent activity, selectivity, and toxicity resistance is one of the difficult problems for the selective reduction of NO by NH3 (NH3-SCR) at low temperature. Herein, we synthesize a novel and rational framework-confined ordered mesoporous CeSnOx/TiO2-E catalyst. Through a classical evaporation-induced self-assembly (EISA) strategy, the active components participate in the formation process of ordered mesoporous, which confines the catalytic active species into the interior of the overall structure. Via an array of microscopic characterizations and spectroscopic analysis, we have discovered that the presence of the ordered mesoporous structure makes the catalyst have a prominent confined effect on the framework. The high dispersion of nanoparticles in the system is realized here. Meanwhile, the cerium-based with Sn-doped catalyst system achieves the change of electronic structure and increases the charge exchange frequency, which enables the catalyst to acquire outstanding redox ability and abundant acidic sites. In addition, the ordered mesoporous structure of the catalyst guided the active components to produce a synergistic effect, and the uniform pore structure and metal doping enhanced the anti-poisoning ability. This strategy not only improves the low-temperature catalytic performance of the catalyst but also protects the nanoparticles from poisoning, which is beneficial to the long-time stability of the NH3-SCR reaction. © 2022, The Authors. All rights reserved.

关键词： Toxicity

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Deposition of FeCoNiCrMn high entropy alloy(HEA) coating via cold spraying

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Journal of materials Science & technology 2019年第6期35卷 1003-1007页

作者： Shuo Yin Wenya Li Bo Song Xingchen Yan Min Kuang Yaxin Xu Kui Wen Rocco Lupoi Trinity College Dublin The University of Dublin Department of Mechanical and Manufacturing Engineering Parsons Building Dublin 2 Ireland State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding Technologies School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 China National Engineering Laboratory for Modern Materials Surface Engineering Technology The Key Lab of Guangdong for Modern Surface Engineering Technology Guangdong Institute of New Materials Guangzhou 510651 China

High entropy alloys(HEAs) are of great interest in the community of materials science and engineering due to their unique phase structure. They are constructed with five or more principal alloying elements in equimolar or near-equimolar ratio. Therefore, HEAs can derive their performance from multiple principal elements rather than a single element. In this work, solid-state cold spraying(CS) was applied for the first time to produce FeCoNiCrMn HEA coating. The experimental results confirm that CS can be used to produce a thick HEA coating with low porosity. As a low-temperature deposition process, CS completely retained the HEA phase structure in the coating without any phase transformation. The characterization also reveals that the grains in the CSed HEA coating had experienced significant refinement as compared to those in the as-received HEA powder due the occurrence of dynamic recrystallization at the highly deformed interparticle region. Due to the increased dislocation density and grain boundaries,CSed HEA coating was much harder than the as-received powder. The tribological study shows that the CSed FeCoNiCrMn HEA coating resulted in lower wear rate than laser cladded HEA coatings.

关键词： Cold spraying (CS) High entropy alloys (HEAs) Metal matrix composites (MMCs) Phase change

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Machine learning-assisted characterization of oil micro-displacement hydrodynamics by bionanofluid-flooding in microchannel sand-packed porous media towards enhanced oil recovery

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Chinese Journal of Chemical Engineering 2025年

作者： Zhihong Chen Jiawei Wu Wei Zhang Wenjing Zhang Xiaoling Lou Junxian Yun State Key Laboratory of Green Chemistry Synthesis and Conversion Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 China State Key Laboratory of Advanced Separation Membrane Materials Zhejiang Key Laboratory of Surface and Interface Science and Engineering for Catalysts College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 China

The displacement of residual crude oil and enhanced oil recovery from reservoirs of mature oil fields are challenging worldwide and have received intensive attentions in oil and gas industry. In this work, a novel method for enhanced oil recovery by displacement of oil with bionanofluids was proposed. Micro-displacement hydrodynamics of crude oil in microchannel sand-packed porous media by the bionanofluid were investigated by high-speed imaging. The machine learning models with the extreme gradient boosting (XGBoost) algorithm was developed for the prediction of residual oil saturation during the micro-displacement processes. The residual oil droplets within the porous media after the waterflooding were effectively removed through bionanofluid-flooding, resulting in additional enhanced oil recovery of 39.0%, which is double the recovery achieved by waterflooding at the same displacement velocity. By wavelet-transform image enhancement and the XGBoost algorithm in the machine learning, the residual oil saturations along the porous media were predicted accurately with the mean squared errors of 0.0045 and 0.0030 in the waterflooding and the bionanofluid-flooding, respectively. The results indicated that the machine learning is effective in characterizing the displacement behaviors and the bionanofluid-flooding could be an interesting approach, and thus has potential applications in enhanced oil recovery of waterflooding reservoirs.

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Near infrared molybdenum oxide quantum dots with high photoluminescence and photothermal performance

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Chinese Chemical Letters 2020年第6期31卷 1616-1619页

作者： Xiaoxiao Dong Hong Zhao Yuanyuan Mi Yao Liu Yida Zhang Ya Liu Yusheng Chen Quan Xu State Key Laboratory of Heavy Oil Processing College of Mechanical and Transportation EngineeringChina University of Petroleum-BeijingBeijing 102249China Research Institute for New Materials Technology Chongqing University of Arts and ScienceChongqing 402160China Department of Chemical Science University of AkronAkronOH 44325United States

The synthesized near infrared molybdenum oxide quantum dots perform excellent red fluorescence imaging performance and photothermal performance,which have 600,650 and 700 nm three unique peaks excited at 540 nm,with a high quantum yield around 20%.Meanwhile,with 808 nm NIR laser excitation,10 mg/mL modified Molybdenum oxide quantum dots can increase temperature up to 72.2℃within 150 s and 77.7℃within 270 s,respectively.

关键词： Molybdenum oxide quantum dots Fluorescence imaging performance Photothermal performance Carbon dots Near infrared

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Atomic layer deposition for quantum dots based devices

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Opto-Electronic Advances 2020年第9期3卷 1-14页

作者： Binze Zhou Mengjia Liu Yanwei Wen Yun Li Rong Chen State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Quantum dots(QDs)are promising candidates for the next-generation optical and electronic devices due to the outstanding photoluminance efficiency,tunable bandgap and facile solution ***,the limited optoelectronic performance and poor lifetime of QDs devices hinder their further *** a gas-phase surface treatment method,atomic layer deposition(ALD)has shown the potential in QDs surface modification and device construction owing to the atomic-level control and excellent uniformity/*** this perspective,the attempts to utilize ALD techniques in QDs modification to improve the photoluminance efficiency,stability,carrier mobility,as well as interfacial carrier utilization are *** proves to be successful in the photoluminance quantum yield(PLQY)enhancement due to the elimination of QDs surface dangling bonds and *** QDs stability and devices lifetime are improved greatly through the introduction of ALD barrier ***,the carrier transport is ameliorated efficiently by infilling interstitial spaces during ALD *** to the ultra-thin and dense coating on the interface,the improvement on optoelectronic performance is ***,the challenges of ALD applications in QDs at present and several prospects including ALD process optimization,in-situ characterization and computational simulations are proposed.

关键词： atomic layer deposition quantum dots surface passivation stability carrier transport interface engineering

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Self-Assembled Chitosan Hybrid Carrying P/B Elements for Polylactide With Enhanced Fire Safety And Mechanical Properties

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SSRN 2022年

作者： Cao, Xianwu Huang, Jingshu Tong, Yizhang Yuen, Anthony Chun Yin Zhao, Wanjing Huang, Qilong Wu, Wei Li, Robert K.Y. Key Laboratory of Polymer Processing Engineering of Ministry of Education Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing School of Mechanical and Automotive Engineering South China University of Technology Guangzhou510640 China Jihua Laboraory Foshan528200 China Sydney2052 Australia Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong

The inherent shortcomings such as flammability, brittleness, and low crystallinity limit the broad applications of biodegradable poly(lactic acid) (PLA). In order to improve the fire resistance and mechanical properties of PLA, a chitosan-based core-shell flame retardant additive (APBA@PA@CS) was synthesized for PLA via the self-assembly of interionic interactions between chitosan (CS), phytic acid (PA), and 3-aminophenyl boronic acid (APBA). The peak heat release rate (pHRR) and total heat release rate (THR) of PLA composite containing 3wt% APBA@PA@CS decreased from 460.1 kW/m2 and 75.8 MJ/m2 to 419.0 kW/m2 and 53.1 MJ/m2 , respectively. APBA@PA@CS formed a high-quality carbon layer rich in phosphorus and boron in the condensed phase and released plenty of inert gas in the gas phase to hinder the exchange of heat and O2 , thereby having a synergistic flame retardant effect. Meanwhile, the tensile strength, strain and crystallinity of PLA/APBA@PA@CS were increased by 3.7%, 17.4% and 55.2%, respectively. © 2022, The Authors. All rights reserved.

关键词： Tensile strength

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Excipient-free porphyrin/SN-38 based nanotheranostics for drug delivery and cell imaging

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Nano Research 2020年第2期13卷 503-510页

作者： Ye Yuan Ruonan Bo Di Jing Zhao Ma Zhongling Wang Tzu-yin Lin Lijie Dong Xiangdong Xue Yuanpei Li Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China Department of Biochemistry and Molecular Medicine UC Davis Comprehensive Cancer CenterUniversity of California DavisSacramento 95817USA School of Veterinary Medicine Yangzhou UniversityYangzhou 225009Chino Department of Oncolog) Xiangya HospitalCentral South UniversityChangsha 410008China Department of Radiology Shanghai General HospitalShanghai jiao Tong University School of MedicineShanghai 200080China Division of Hematology/Oncology Department of Internal MedicineUniversity of California DavisSacramento 95817USA College of Life Sciences Northwest UniversityXian 710069China

Nanotheranostics with comprehensive diagnostic and therapeutic capabilities show exciting cancer treatment ***,we develop an excipient-free drug delivery system for cancer diagnosis as well as therapy,in which a near infra-red photosensitizer and a chemotherapeutic drug can be self-delivered without any *** building block of the drug delivery system was synthesized by covalently conjugating four anticancer drugs(7-ethyl-10-hydroxy-camptothecin,SN-38)with a photosensitizer(porphyrin)via hydrolyzable ester linkage,which endows the drug delivery system with 100%active pharmaceutical ingredients,excellent imaging,and therapeutic *** conjugates can readily self-assemble into nanosheets(PS NSs)and remain stable for at least 20 days in aqueous *** PS NSs,fluorescence resonance energy transfer(FRET)dominates the fluorescence of SN-38 and enables to monitor the drug release *** PS NSs also show excellent anticancer activity in vitro,due to the increased cell uptake with the synergistic effect of photodynamic therapy and chemotherapy.

关键词： porphyrin 7-ethyl-10-hydroxy-camptothecin(SN-38) drug delivery self-indication nanotheranostics photodynamic therapy

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Excellent photocatalytic performance of PAA/Na 2 MoO 4 -Fe 3+ hydrogel with Na 2 MoO 4 as sacrificial agent for dye removal

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2024年 702卷

作者： Wei Gao Yuyan Wang Ming Zhong Huichun Kang Bitao Su Ziqiang Lei Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education of China Key Laboratory of Polymer Materials of Gansu Province College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 PR China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou 730050 PR China

Currently, the majority of photocatalytic materials primarily consist of insoluble semiconductors, whereas soluble semiconductor materials have limited applications in photocatalysis. In this study, it is proposed for the first time to use the soluble semiconductor sodium molybdate (Na 2 MoO 4 ) as a sacrificial agent to fabricate a polyacrylic acid/sodium molybdate-Fe 3+ hydrogel photocatalyst (PAA/Na 2 MoO 4 -Fe 3+ ) through polymerization with Fe 3+ ions and acrylic acid (AA) monomer. The hydrogel photocatalyst was thoroughly characterized and the results revealed that the presence of Na 2 MoO 4 in ionic form within the hydrogel significantly enhanced its adsorption capacity for pollutant molecules. Additionally, Fe 3+ ions coordinated with -COOH ( L ) groups on PAA to form [Fe( L ) 6 ] 3+ ions, which acted as active sites of photocatalytic. Moreover, the PAA/Na 2 MoO 4 -Fe 3+ hydrogel exhibited promising potential as a photocatalyst for the remove of dye pollutants (e.g. MB, MG, RhB and MO) from wastewater. Finally, we also explored and analyzed the photocatalytic mechanism of the hydrogel. It is noteworthy to conclude that the hydrogel possesses immense potential for the practical application of photocatalytic techniques in the treatment of dyes wastewater.

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Effect of Thickness Ratio on Interfacial Morphology and Mechanical Properties of Mg/Al Composite Plates in Differential Temperature Asymmetrical Rolling

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SSRN 2022年

作者： Zhi, Chenchen Wu, Zhenyu Ma, Lifeng Huang, Zhiquan Zheng, Zebang Xv, Haijie Jia, Weitao College of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan030024 China Heavy Machinery Engineering Research Center Ministry of Education Taiyuan University of Science and Technology Taiyuan030024 China State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment School of Materials Science and Engineering Northwestern Polytechnical University Xi’an710072 China Part Rolling Key Laboratory of Zhejiang Province Ningbo University Ningbo315211 China

In order to investigate the effects of different thicknesses of matrix and clad plates on the microstructure, interface morphology, and mechanical properties of Mg/Al composite plates, Mg/Al composite plates with different thickness ratios were prepared by differential temperature asymmetrical rolling + isothermal symmetrical rolling method. It is demonstrated that the maximum thickness of Mg 17 Al 12 and Al 3 Mg 2 is 15.8μm when the thickness ratio is 2, and the shear fracture of the composite plate occurs in the metal compound layer. With the increase of the thickness ratio, the intermetallic compounds gradually decrease, and the relative deformation rate of matrix and clad plates gradually converges under the influence of Mg layer work hardening. When the thickness ratio is 5, the diffusion of Mg elements is the most obvious on the Al layer. The bonding strength and plasticity of the composites increase first and then decrease with the increase of thickness ratio, while the tensile strength decreases gradually. When the thickness ratio is 3, the composite plates obtain the optimal comprehensive mechanical properties, the maximum bonding strength is 94.2 MPa;the tensile strength is 277.4 MPa, and the maximum elongation is 18.7%. © 2022, The Authors. All rights reserved.

关键词： Tensile strength

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