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3D flower-like mesoporous Bi_(4)O_(5)I_(2)/MoS_(2)Z-scheme heterojunction with optimized photothermal-photocatalytic performance

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Green Energy & Environment 2023年第1期8卷 200-212页

作者： Sijia Song Zipeng Xing Ke Wang Huanan Zhao Peng Chen Zhenzi Li Wei Zhou Department of Environmental Science School of Chemistry and Materials ScienceKey Laboratory of Functional Inorganic Material ChemistryMinistry of Education of the People's Republic of ChinaHeilongjiang UniversityHarbin150080China Shandong Provincial Key Laboratory of Molecular Engineering School of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)JinanShandong250353China

3D flower-like hierarchical mesoporous Bi_(4)O_(5)I_(2)/MoS_(2)Z-scheme layered heterojunction photocatalyst was fabricated by oil bath and hydrothermal *** heterojunction with narrow band gap of~1.95 eV extended the photoresponse to near-infrared region,which showed obvious photothermal effect due to the introduction of MoS_(2) with broad spectrum ***_(2) nanosheets were anchored onto the surface of flower-like hierarchical mesoporous Bi_(4)O_(5)I_(2) nanosheets,thereby forming efficient layered heterojunctions,the solar-driven photocatalytic efficiency in degradation of highly toxic dichlorophenol and reduction of hexavalent chromium was improved to 98.5%and 99.2%,which was~4 and 7 times higher than that of the pristine Bi_(4)O_(5)I_(2),*** addition,the photocatalytic hydrogen production rate reached 496.78 μmol h^(-1)g^(-1),which was~6 times higher than that of the pristine Bi_(4)O_(5)I_(2).The excellent photocatalytic performance can be ascribed to the promoted photothermal effect,as well as,the formation of compact Z-scheme layered *** 3D flower-like hierarchical mesoporous structure provided adequate surface active-sites,which was conducive to the mass ***,the high stability of the prepared photocatalyst further promoted its potential practical *** strategy also provides new insights for fabricating layered Zscheme heterojunctions photocatalysts with highly photothermal-photocatalytic efficiency.

关键词： Photocatalysis Z-scheme heterojunction Bi4O5I2 MoS2 Photothermal effect

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Agglomeration Rate Estimation of Mineral Oil based ZnO Nanofluids by Dielectric Spectroscopy 3

Agglomeration Rate Estimation of Mineral Oil based ZnO Nanof...

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3rd IEEE Applied Signal Processing Conference, ASPCON 2023

作者： Ghosh, Susmita Chatterjee, Biswendu Chakraborty, Biswajit Dalai, Sovan Pradhan, Arpan Kumar Jadavpur University School of Material Science and Nano Technology Kolkata India Jadavpur University Electrical Engineering Department Kolkata India

ISBN: (纸本)9798350325881

In this paper, an advance method is proposed to predict the agglomeration rate of nanofluids using dielectric spectroscopic method. For this purpose, mineral oil based zinc oxide (ZnO) nanofluids are prepared in the laboratory with different concentrations (0.01%, 0.03%, 0.05%, and 0.07%). First, ZnO nanoparticles are synthesized by low temperature hydrothermal method in the laboratory. By employing X-ray diffraction method, the average diameter of the ZnO nanoparticles is found to be 28.21nm. After that, ZnO nanofluids are prepared using two-step process. After the preparation of nanofluids, frequency domain spectroscopy is conducted with different concentration of nanofluids. From frequency domain spectroscopy, Low Frequency Dispersion of dielectric dissipation factor and real component of complex capacitance are evaluated. Using these aforementioned parameters, an empirical relationship is established to estimate the agglomeration rate of ZnO nanofluids. This study further helps to prepare a long term stable nanofluids which may be used as a good alternative to mineral oil. © 2023 IEEE.

关键词： II-VI semiconductors

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Control of Extended Defect Growth in Perovskite Oxide Thin Films using Nanoscale Patterning

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 541-542页

作者： Ghosh, Supriya Liu, Fengdeng Jalan, Bharat Mkhoyan, K Andre Department of Chemical Engineering and Material Science University of Minnesota Minneapolis MN United States Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN United States

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Design of Complementary Meander Shaped Resonator for Adulteration Testing

Design of Complementary Meander Shaped Resonator for Adulter...

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2023 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2023

作者： Jain, Surabhi Azad, Prakrati Tiwari, Nilesh Kumar Akhtar, M. Jaleel Indian Institute of Technology Kanpur Department of Electrical Engineering Kanpur India Indian Institute of Technology Kanpur Material Science & Engineering Kanpur India

ISBN: (纸本)9798350328264

A new compact planar RF sensor design is realized to assess the purity of edible oils. The shape of the sensor structure is designed to realize an improved sensitivity and quality factor. The sensor structure is quite compact as it utilizes the meander shape tropology. The fabricated sensor prototype provides quite a high-quality factor (298) than that of the conventional design of electrically small resonant sensors (128). Also, the obtained absolute sensitivity around resonant frequency (801MHz) is substantially higher than the literature available data (111 MHz). The sensor provides a 275 KHz shift in the resonant frequency for 20% adulteration of commercially available cheap oil. Moreover, it is found that the sensor can produce nearly 65 KHz shift in resonant frequency for a 5% contamination level, which is well above its repeatability limit of 12.5 KHz. © 2023 IEEE.

关键词： Adulteration detection flared microstrip line Meander shaped complementary split ring resonator (CSRR) Microwave sensors planar microwave probe sensitivity

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Thermally Switchable Wideband Metamaterial Absorber using Vanadium Dioxide

Thermally Switchable Wideband Metamaterial Absorber using Va...

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2023 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2023

作者： Vishwakarma, Rahul Yadav, Jyoti Mishra, Abhishek Verma, Amit Srivastava, Kumar Vaibhav Indian Institute of Technology Department of Electrical Engineering Kanpur India Indian Institute of Technology Material Science Programme Kanpur India

ISBN: (纸本)9798350328264

In this paper, a switchable Metamaterial Absorber (MMA) design and simulation based on phase change material (VO2) is presented. VO2 has been used for the switchable behaviour of MMA. The proposed design is having absorption bandwidth of 2.11 to 8.41 GHz covering the S and C bands for normal incidence of electromagnetic waves. When VO2 is in the metallic state, the design works as a wide band absorber whereas in the insulating state, it behaves as a wide band reflector. The design is symmetrical which leads to polarisation insensitive behaviour of MMA. It is stable for oblique incidence response up to 30 degrees for TE polarization and up to 60 degrees for TM polarization. The profile of MMA is 0.098 λL with a periodicity of 0.141 λL where λL corresponds to the lowest frequency. The proposed MMA will be an effective way out of the problem of complex DC biasing circuits and the use of multiple lumped elements in active metamaterial absorbers. © 2023 IEEE.

关键词： absorbers metamaterials phase change materials switchable absorbers

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Study on the Relationship Between Vibration Signals in CFRP Grinding and Grinding Mechanism

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Chinese Journal of Mechanical engineering 2024年第6期37卷 334-345页

作者： Lichen Li Fangyuan Wang Pengda Song Kai Jin Lei Chu Sansan Ding Guido A.Berti Luca Quagliato College of Material Science and Technology Ocean University of ChinaQingdao 266404China CRRC Qingdao Sifang Locomotive&Rolling Stock Co. Ltd.Qingdao 266111China Department of Management and Engineering University of Padua36100 VicenzaItaly Division of Mechanical and Biomedical Engineering Ewha Womans UniversitySeoul 03760Republic of Korea

In the process of grinding carbon fiber reinforced polymer(CFRP),the changing state of acceleration vibration signal is closely related to the grinding surface ***,the time domain and frequency domain signal changes in acceleration can be used to monitor and control the grinding process to improve machining quality and *** this paper,changes in acceleration frequency domain signals under different grinding angles are studied,and the relationship between the vibration forms of acceleration frequency domain signals at the beginning,middle and end of grinding as well as the surface morphology and quality of the corresponding grinding position is *** with the micro-morphology of the grinding area,it can be seen that,a high frequency and low amplitude vibration can improve the grinding surface quality,but a high amplitude will have a negative impact on the grinding *** acceleration vibration during grinding is more stable and the corresponding surface quality is *** an increase in grinding angle,the maximum amplitude of acceleration first increases and then *** length of the surface fiber also initially decreases and then ***,the resin residue first increases and then *** purpose of this study is to provide a theoretical basis for the subsequent grinding state adjustment.

关键词： CFRP Grinding mechanism Acceleration signal Roughness

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Improved mechanical properties and strengthening mechanism with the altered precipitate orientation in magnesium alloys

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Journal of Magnesium and Alloys 2022年第5期10卷 1256-1267页

作者： Y.J.Wan Y.Zeng Y.C.Dou D.C.Hu X.Y.Qian Q.Zeng K.X.Sun G.F.Quan Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China College of Materials Science and Engineering Sichuan University of Science and EngineeringZigong 643000China Department of Materials The University of ManchesterOxford RoadManchester M139PLUnited Kingdom

Aging prior to twinning deformation was proposed to alter the precipitate orientation of the plate-shapedβ-MgAlfrom(0002)basal planes(named basal plates)to■prismatic planes(named prismatic plates)in AZ31 Mg *** experimental results showed that the compressive yield strength(CYS)of the sample containing prismatic plates increased 40 MPa and the compression ratio raised by 22%compared to that containing basal *** underlying strengthening mechanism was analyzed via a yield strengthen(YS)model with a function of grain size,precipitate characters(size,oritention,fraction)and Schmid factor(SF).It revealed that the improvement of CYS was mainly attributed to the altered precipitate orientation and refined grain size produced by twinning ***,the prismatic plates always have a stronger hardening effect on basal slip than basal plates under the same varites of precipitate diameter and ***,the decreased CRSS ratio of prismatic slip to basal slip revealed that the activity of non-basal slip in Mg alloy might be *** activated slip systems provided more mobile dislocations,contributing to the large compression ratio of the Mg rolled sheet with prismatic plates.

关键词： Precipitate orientation Precipitation strengthening Grain boundary strengthening Yield strength model

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Self-supported VO_(2) on polydopamine-derived pyroprotein-based fibers for ultrastable and flexible aqueous zinc-ion batteries

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Carbon Energy 2024年第7期6卷 1-13页

作者： Jeong Seok Yeon Sul Ki Park Shinik Kim Santosh VMohite Won Il Kim Gun Jang Hyun-Seok Jang Jiyoung Bae Sang Moon Lee Won GHong Byung Hoon Kim Yeonho Kim Ho Seok Park School of Chemical Engineering College of EngineeringSungkyunkwan UniversityGyeonggi-doRepublic of Korea Department of Engineering University of CambridgeCambridgeUK Department of Applied Chemistry Konkuk UniversityChungjuRepublic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)College of Natural SciencesUlsanRepublic of Korea Department of Physics Incheon National UniversityIncheonRepublic of Korea Intelligent Sensor Convergence Research Center Incheon National UniversityIncheonRepublic of Korea Institute of Basic Science Incheon National UniversityIncheonRepublic of Korea Division of Material Analysis and Research Korea Basic Science InstituteDaejeonRepublic of Korea

A conventional electrode composite for rechargeable zinc-ion batteries(ZIBs)includes a binder for strong adhesion between the electrode material and the current ***,the introduction of a binder leads to electrochemical inactivity and low electrical conductivity,resulting in the decay of the capacity and a low rate *** present a binder-and conducting agent-free VO_(2) composite electrode using in situ polymerization of dopamine on a flexible current collector of pyroprotein-based *** as-fabricated composite electrode was used as a substrate for the direct growth of VO_(2) as a self-supported form on polydopamine-derived pyroprotein-based fibers(pp-fibers@VO_(2)(B)).It has a high conductivity and flexible nature as a current collector and moderate binding without conventional binders and conducting agents for the VO_(2)(B) *** addition,their electrochemical mechanism was *** energy storage is induced by Zn^(2+)/H^(+) coinsertion during discharging,which can be confirmed by the lattice expansion,the formation of by-products including Zn_(x)(OTf)_(y)(OH)_(2x−y)·nH_(2)O,and the reduction of V^(4+)to V^(3+).Furthermore,the assembled Zn//pp-fibers@VO_(2)(B) pouch cells have excellent flexibility and stable electrochemical performance under various bending states,showing application possibilities for portable and wearable power sources.

关键词： aqueous battery binder free conducting agent‐free flexible electrode zinc‐ion battery

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Dynamic response of the cell traction force to osmotic shock

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Microsystems & Nanoengineering 2023年第5期9卷 321-331页

作者： Yongman Liu Wenjie Wu Shuo Feng Ye Chen Xiaoping Wu Qingchuan Zhang Shangquan Wu School of Biomedical Engineering Anhui Medical University230032 HefeiChina CAS Key Laboratory of Mechanical Behavior and Design of Material Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of China230026 HefeiChina

Osmotic pressure is vital to many physiological activities,such as cell proliferation,wound healing and disease ***,how cells interact with the extracellular matrix(ECM)when subjected to osmotic shock remains ***,we visualize the mechanical interactions between cells and the ECM during osmotic shock by quantifying the dynamic evolution of the cell traction *** show that both hypertonic and hypotonic shocks induce continuous and large changes in cell traction ***,the traction force varies with cell volume:the traction force increases as cells shrink and decreases as cells ***,the direction of the traction force is independent of cell volume changes and is always toward the center of the cell-substrate ***,we reveal a mechanical mechanism in which the change in cortical tension caused by osmotic shock leads to the variation in traction force,which suggests a simple method for measuring changes in cell cortical *** findings provide new insights into the mechanical force response of cells to the external environment and may provide a deeper understanding of how the ECM regulates cell structure and function.

关键词： traction healing wound

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Recent research progress in the mechanism and suppression of fusion welding-induced liquation cracking of nickel based superalloys

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International Journal of Minerals,Metallurgy and materials 2024年第5期31卷 1072-1088页

作者： Zongli Yi Jiguo Shan Yue Zhao Zhenlin Zhang Aiping Wu Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China College of Engineering China Agricultural UniversityBeijing 100091China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China School of Material Science and Engineering Southwest Jiaotong UniversityChengdu 610031China

Nickel-based superalloys are extensively used in the crucial hot-section components of industrial gas turbines,aeronautics,and astronautics because of their excellent mechanical properties and corrosion resistance at high *** welding serves as an effective means for joining and repairing these alloys;however,fusion welding-induced liquation cracking has been a challenging *** paper comprehensively reviewed recent liquation cracking,discussing the formation mechanisms,cracking criteria,and *** recent investigations,regulating material composition,changing the preweld heat treatment of the base metal,optimizing the welding process parameters,and applying auxiliary control methods are effective strategies for mitigating *** promote the application of nickel-based superalloys,further research on the combination impact of multiple elements on cracking prevention and specific quantitative criteria for liquation cracking is necessary.

关键词： nickel-based superalloy fusion welding liquation cracking cracking mechanism cracking suppression

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