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The effect of Mg-Al substitution, particle size reduction, and thickness of BaFe12-2xMgxAlxO19 samples on increasing electromagnetic wave absorption

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Materials Today: Proceedings 2023年 80卷 704-709页

作者： Yustanti, Erlina Hafidzatul Hakimah, Vini Noviyanto, Alfian Randa, Maulana Manawan, Maykel Department of Metallurgical Engineering Faculty of Engineering Sultan Ageng Tirtayasa University Jl. Jend. Sudirman KM. 03 Banten Cilegon 42435 Indonesia Centre of Excellence Nanomaterial and Process Technology Laboratory Faculty of Engineering Sultan Ageng Tirtayasa University Jl. Jend. Sudirman KM. 03 Banten Cilegon 42435 Indonesia Advanced Materials Research Group Nano Center Indonesia Banten Jl. PUSPIPTEK Tangerang Selatan 15314 Indonesia Department of Mechanical Engineering Mercu Buana University Jl. Meruya Selatan Kebun Jeruk Jakarta 11650 Indonesia Research and Development Agency Indonesia Ministry of Defense Jl. Jati No.1 Pondok Labu Jakarta 12450 Indonesia Teknologi Daya Gerak Fakultas Teknologi Pertahanan Universitas Pertahanan RI. Kawasan IPSC Sentul Sukahati Kec. Citeureup Jawa Barat Kabupaten Bogor 16810 Indonesia

The synthesis of microwave-absorbing materials through a combined destruction process using mechanical alloying and ultrasonic vibration is significant due to its practical, waste-free scalability. Barium hexaferrite is the best candidate for synthesizing radar absorber materials through a combined destruction process. The substitution of Mg-Al on barium hexaferrite and decreasing particle size can increase the absorption of electromagnetic waves. Mixing stoichiometric precursors Sigma Aldrich 99 % BaCO3, Fe2O3, Al2O3, and MgO through wet milling for 20 h, followed by sintering at 1200 °C for 2 h to grow crystal embryos. Mechanical alloying was used to create the single-phase BaFe12-2xMgxAlxO19 (x = 0;0.3;0.5;0.7). re-milling for 20 h and ultrasonic vibration for 2 h reduced the particle size of the Mg-Al reinforced barium hexaferrite crystalline material. The increase in Mg-Al substitution in barium hexaferrite does not change the hexagonal structure but increases the density and absorption of electromagnetic waves. Mg-Al substitution at x = 0.3 resulted in uniform average particle size of 211.8 nm with a narrow particle size distribution, resulting in the lowest reflection loss of −17.62 dB at 8.2 GHz. This research increases the absorption ability of BaFe11.4Mg0.3Al0.3O19 electromagnetic waves up to 98 %. © 2022

关键词： Mechanical alloying

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Recent advances of covalent organic frameworks-based photocatalysts:Principles,designs,and applications

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Chinese Journal of Catalysis 2025年第3期70卷 142-206页

作者： Hongjun Dong Chunhong Qu Chunmei Li Bo Hu Xin Li Guijie Liang Jizhou Jiang Advanced Chemical Engineering Laboratory of Green Materials and Energy of Jiangsu Province Institute of Green Chemistry and Chemical TechnologySchool of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina Baicheng Normal University Baicheng 137000JilinChina Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and Utilization of Ministry of Agriculture and Rural AffairsKey Laboratory for Biobased Materials and Energy of Ministry of EducationCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510642GuangdongChina School of Environmental Ecology and Biological Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205HubeiChina Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053HubeiChina

Covalent organic frameworks(COFs)semiconductor materials have garnered significant attention in solar to chemical energy conversion owing to their unique properties,including structural tunability,pre-design capability,large surface area,abundant pore structures,high crystallinity,excellent chemical stability,suitable energy-band structure,fast charge carrier transfer and so *** intrinsic features endow COFs with the remarkable candidates for various photocatalytic applications including photocatalytic H_(2) generation from water reduction,CO_(2) reduction,degradation of organic pollutants,N_(2) fixation,H_(2)O_(2) evolution,and even organic ***,this review comprehensively summarizes the recent advancements in COF-based materials for the above photocatalytic reactions,including the historic overview of the COF in the photocatalysis field,the fundamentals and design philosophy of COF-based photocatalysts,the advances of synthesis strategies,the structural characteristics and diversities,the practical applications in various photocatalytic fields as well as the challenges and future development direction in terms of COFs material and application *** sincerely hope this review can offer symbolic guidelines for future development COF semiconductor materials in this promising field.

关键词： Covalent organic framework Photocatalysis Structural feature Energy conversion Environmental purification

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Mineral Phase Ratio of MEBIOS Sinter and its Reducibility under Blast Furnace Condition with High Hydrogen Concentration

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ISIJ International 2025年第6期65卷 728-738页

作者： Murakami, Taichi Motomura, Yuki Maruoka, Daisuke Sunahara, Kohei Sato, Takeshi Kasai, Eiki Graduate School of Environmental Studies Tohoku University 6-6-02 Aoba Aramaki Aoba-ku Sendai Miyagi980-8579 Japan Graduate School of Environmental Studies Tohoku University Sumitomo Metal Mining CO. LTD. 145-1 Funaya-Aza-Shinchi-Otu Saijyo Ehime793-0005 Japan Graduate School of Environmental Studies Tohoku University. Now at Material and Biological Engineering Course National Institute of Technology Hachinohe College 16-1 Uwanotai Tamonoki Hachinohe Aomori039-1192 Japan Experimental Blast Furnace Project Division Process Research Laboratories Nippon Steel Corporation Experimental BF office 1 Kimitsu Kimitsu-shi Chiba299-1141 Japan Advanced Reduction Process Development Dept. JFE Steel Corporation 2-3 Uchisaiwai-cho 2-chome Chiyoda-ku Tokyo100-0011 Japan

For decreasing carbon dioxide emission from iron- and steelmaking industry, hydrogen utilization in the blast furnace has been considered. Iron ore sinter is one of the major iron sources for the blast furnace. It is known that the effects of the hydrogen concentration in the reducing gas on the reducibility and reduction disintegration of the sinter are strong. In this study, the evaluation of the mineral phase of the Mosaic EmBedding Iron Ore Sintering (MEBIOS) sinter and reducibility using a laboratory scale furnace simulated the blast furnace condition with high hydrogen concentration and the experimental blast furnace were carried out. MEBIOS sinter has higher ratio of the mineral phases, i.e., hematite and acicular calcium ferrite with primary hematite, showing higher reducibility compared to the conventional sinters. The value of JIS-RDI of the MEBIOS sinter decreases with an increase in that of JIS-RI, which is the reverse trend of the conventional sinter. Further, the basket charge test with the experimental blast furnace confirmed that the MEBIOS sinter shows high reducibility under the condition of high hydrogen concentration while the reduction disintegration behavior at low temperature is similar to conventional sinter. © 2025 The Iron and Steel Institute of Japan.

关键词： Iron ore sinter

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Study on thermal stress behavior of mold type POL tile

Study on thermal stress behavior of mold type POL tile

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Kei Murayama Kiyoko Tajima Mikiko Kobayashi Junichi Mizushima Shingo Hayashibe Kiyoshi Oi Process Development Dept. R&D Div. Shinko Electric Industries Co. Ltd. Nagano Japan Desigining Technology Dev. R&D Div. Shinko Electric Industries Co. Ltd. Nagano Japan Advanced Products Dev. R&D Div. Shinko Electric Industries Co. Ltd. Nagano Japan

The power module industry requires smaller common packages to meet the rapidly growing demand. Power Over Lay (POL) tile is a promising candidate to meet these requirements. In this report, we will discuss the behavior of mold type POL tiles under thermal stress and the challenges they face. Temperature cycling tests were performed on several POL tile Cu wiring designs and mold resin combinations. The combination of the design with Cu wiring on the entire surface of the device and the use of high-toughness molding resin was demonstrated high reliability in temperature cycles. Thermal stress analysis results using a full-scale model of mold type POL tile with this combination showed decrease in plastic strain at Cu via connection and low damage level at pad opening portion.

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Efficient Extraction of Alkali and Alkaline Earth Metals from Marine Biomass-Derived Carbon for Use as an Alternative to Traditional Coal or Coke Reductants in Ironmaking

SSRN

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SSRN 2023年

作者： He, Da Sakai, Ryo Saito, Koji Kato, Toru Kosugi, Chika Yi, Hyeonseok Shimohara, Takaaki Nakabayashi, Koji Ko, Seunghyun Miyawaki, Jin Yoon, Seong-Ho Interdisciplinary Graduate School of Engineering Sciences Kyushu University Fukuoka816-8580 Japan Nippon Steel Research Institute Corporation Tokyo100-0005 Japan Environment and Process Research Department The Japan Research and Development Center for Metals Tokyo105-0003 Japan Advanced Technology Research Laboratories Nippon Steel Corporation Chiba293-8511 Japan Institute for Materials Chemistry and Engineering Kyushu University Fukuoka816-8580 Japan Korea Republic of

Pyrolysis of marine biomass (MB) to create marine biomass-based carbon materials (MBCs) for coal replacement in ironmaking is a renewable solution. In this study, we systematically examined pyrolysis processes and performed elemental composition analyses of MB and MBC. The results revealed that MBC contained 12.5–25.5 mass% of alkali and alkaline earth metals (AAEMs). As the pyrolysis temperature increased, some of these AAEMs underwent physical phase changes. Subsequently, we applied CO2 aeration washing or acetic acid washing to eliminate AAEMs from MBC, reducing potential hazards in the blast furnace. Characterization results suggested that both post-processes effectively removed AAEMs from MBC, reducing the average content of Na and K to 0 mass%, Ca to 1.4 mass%, and Mg to 1.9 mass%. The Cl content was also reduced to 0.1 mass%. After removing the AAEMs, the final carbon content of the MBCs according to ultimate analysis was as high as 90.8 mass% (dry ash free basis) with a minimum ash content of 6.4 mass% (dry basis). Comparison with commercial coal products showed that both carbon and ash contents were superior to most coal samples, suggesting that the treated MBCs are of sufficient quality to replace traditional cokes. © 2023, The Authors. All rights reserved.

关键词： Carbon

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Solar Biomass Pyrolysis with Latent Heat Ballast

Solar Biomass Pyrolysis with Latent Heat Ballast

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Power and Energy Engineering (ICPEE), International Conference on

作者： Zhang Huili Baeyens Jan Dewil Raf Li Shuo Deng Yimin Reyes-Urrutia Andrés Venier César Martin Mazza Germán College of Life Science and Technology Beijing University of Chemical Technology Beijing China Beijing Advanced Innovation Centre for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing China Process and Environmental Technology Lab KU Leuven Sint-Katelijne-Waver Belgium Biotechnology and Alternative Energies Institute for Research and Development in Process Engineering Neuquén Argentina Research Center for Computational Methods CIMEC-CONICET National University of the Littoral Santa Fe Argentina

ISBN: (纸本)9781665420471

The concentrated solar-driven pyrolysis of biomass (sawdust) was examined in a fluidized bed reactor with 0.15 mI.D. and 0.3 m bed height, using cristobalite sand as bed material. The fluidized bed a reactor was fitted with in-bed tubes, filled with a phase change material with phase change temperature of 450 to 475°C. Four, 5 and 9 tube-inserts were examined. The solution with 5 tube-insert was experimentally demonstrated to considerably influence the bubble sizes and frequencies in the reactor, leading to an enhanced heat transfer from the irradiated reactor wall to the fluidized bed, and from the fluidized bed to the in-bed tubes. The steam assisted pyrolysis produced between 40 and 55 wt% of high-quality biochar (BET $\gg 100 m^{2}$/g), about 20 to 25 wt% of oxygenated bio-oil and the balance as syngas. The operation at moderate temperature and with steam injection drives the pyrolysis reactor towards biochar production. In using the PCM-ballasted inserts, the temperature could be narrowly controlled within the selected operation range, whereas it was also possible to maintain the temperature at the required level for 15 to 20 minutes during non-sun periods.

关键词： Phase change materials Temperature distribution Electronic ballasts Software packages Electron tubes Biomass Temperature control

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Influence of Annealing on Microstructure of Electroplated Copper Trenches in Back-End-Of-Line

Influence of Annealing on Microstructure of Electroplated Co...

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IEEE International Conference on Interconnect technology

作者： Prashant Kumar Singh Maik Müller Kashi Vishwanath Machani Dirk Breuer Michael Hecker Karsten Meier Frank Kuechenmeister Marcel Wieland Karlheinz Bock Advanced Packaging Development GlobalFoundries Dresden Module One LLC & Co.KG Dresden Germany Institute of Electronic Packaging Technology Technische Universität Dresden Dresden Germany Process Integration BEOL GlobalFoundries Dresden Module One LLC & Co.KG Dresden Germany Central Labs GlobalFoundries Dresden Module One LLC & Co.KG Dresden Germany Global Reliability GlobalFoundries Dresden Module One LLC & Co.KG Dresden Germany

Copper is widely used as an interconnect material in Back-End-of-Line (BEOL) because it has high thermal conductivity and good electromigration failure resistance. However, RF applications require a larger number of ultra-thick copper metals combined with a high metal density. Due to high CTE mismatch of the copper interconnects to silicon a high wafer bow is induced during the BEOL process steps. A main contribution for the high wafer bow is the stress induced in the wafer due to annealing process steps at elevated temperature. The current study focuses on the effect of line width and annealing temperatures on stress relaxation and microstructural evolution due to aging for one month. In addition, the effect of microstructural change is studied with the time dependent wafer bow measurement showing stress relaxation over time.

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A general bottom-up synthesis of CuO-based trimetallic oxide mesocrystal superstructures for efficient catalytic production of trichlorosilane

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Nano Research 2020年第10期13卷 2819-2827页

作者： Hezhi Liu Yongjun Ji Jing Li Yu Zhang Xueguang Wang Haijun Yu Dingsheng Wang Ziyi Zhong Lin Gu Guangwen Xu Yadong Li Fabing Su State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Light Industry Beijing Technology and Business UniversityBeijing 100048China State Key Laboratory of Advanced Special Steel Shanghai UniversityYanchang Road 149Zhabei DistrictShanghai 200072China College of Materials Sciences and Engineering Beijing Unriversity of TechnologyBejing 100124China Department of Chemistry Tsinghua UniversityBeijing 100084China Collee of Engineering Guangdong Technion-Israel Institute of Technology(GTIT)241 Daxue RoadShantou 515063China Department of Chemical Engineering Technion-Israel Institute of Technology(IT)Haifa 32000Israel Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Institute of Industrial Chemistry and Energy Technology Shenyang University of Chemical TechnologyShenyang 110142China Zhongke Langfang Institute of Process Engineering Fenghua Road No ILangfang Economic&Technical Development ZoneLangfang 065001China

Mesocrystals, the non-classical crystals with highly ordered nanoparticle superstructures, have shown great potential in many applications because of their newly collective properties. However, there is still a lack of a facile and general synthesis strategy to organize and integrate distinct components into complex mesocrystals, and of reported application for them in industrial catalytic reactions. Herein we report a general bottom-up synthesis of CuO-based trimetallic oxide mesocrystals (denoted as CuO-M1Ox-M2Oy, where M1 and M2 = Zn, In, Fe, Ni, Mn, and Co) using a simple precipitation method followed by a hydrothermal treatment and a topotactic transformation via calcination. When these mesocrystals were used as the catalyst to produce trichlorosilane (TCS) via Si hydrochlorination reaction, they exhibited excellent catalytic performance with much increased Si conversion and TCS selectivity. In particular, the TCS yield was increased 19-fold than that of the catalyst-free process. The latter is the current industrial process. The efficiently catalytic property of these mesocrystals is attributed to the formation of well-defined nanoscale heterointerfaces that can effectively facilitate the charge transfer, and the generation of the compressive and tensile strain on CuO near the interfaces among different metal oxides. The synthetic approach developed here could be applicable to fabricate versatile complicated metal oxide mesocrystals as novel catalysts for various industrial chemical reactions.

关键词： CuO-based trimetallic oxide mesocrystal superstructures catalytic production of trichlorosilane synthesis strategy

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A multi-physical field coupling modeling incorporated the non-thermal effect: carbothermic reduction of ZnFe2O4 by using microwave heating

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Energy 2025年 328卷

作者： Xiong, Yuandong Qiu, Dejin Li, Ang Omran, Mamdouh Ren, Jie Lu, Chunyang Yao, Hao Li, Manqing Xie, Hao Yu, Yaowei State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and Engineering Shanghai University 99 Shangda Rd Shanghai China Process Metallurgy Research Group Faculty of Technology University of Oulu Oulu Finland Zhenjiang Innovation and Development Research Institute Nanjing Normal University Zhenjiang China

Microwave heating has recently gained significant attention and is increasingly applied in the pyrometallurgical recovery of Zn (ZnFe2O4) from electric arc furnace dust (EAFD). Under microwave irradiation, a portion of the microwave energy is stored within molecules, enhancing the carbothermic reduction (non-thermal effect). However, quantifying the influence of the non-thermal effect in experiments remains challenging due to the invisibility of microwaves. For advancing the scalability of microwave-assisted EAFD processing, the present study focuses on ZnFe2O4 and develops a multiphysics model incorporating the non-thermal effect to elucidate the enhancement mechanism of microwaves on the reduction process. The main conclusions indicate that increasing microwave input power and graphite addition effectively enhances both the heating and reaction efficiency of the ZnFe2O4-graphite mixture. Higher power input improves efficiency while mitigating thermal runaway risks more effectively than increasing graphite addition. However, the uneven distribution of microwaves leads to localized thermal effects, impacting heating uniformity and overall reaction consistency within the mixture. Furthermore, non-isothermal kinetic analysis reveals that microwave irradiation enhances the carbothermic reduction of ZnFe2O4 through both thermal and non-thermal effects. With a stoichiometric coefficient of 1.2 for graphite addition, localized thermal and non-thermal effects reduce the apparent activation energy by 34.3 % and 25.8 %, respectively. © 2025 Elsevier Ltd

关键词： Activation energy

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Light-response adsorption and desorption behaviors of metal–organic frameworks

Environmental Functional Materials

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Environmental Functional Materials 2022年第1期1卷 49-66页

作者： Chao-Yang Wang Lingshan Ma Chong-Chen Wang Peng Wang Leonardo Gutierrez Weiwei Zheng Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation/Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center Beijing University of Civil Engineering and Architecture Beijing 100044 PR China Center for Microbial Ecology and Technology (CMET) Ghent University Coupure Links 653 9000 Ghent Belgium Center for Advanced Process Technology for Urban Resource Recovery (CAPTURE) Frieda Saeysstraat 1 9000 Ghent Belgium Department of Chemistry Syracuse University Syracuse NY 13244 United States

Metal–organic frameworks (MOFs) are ideal adsorbents because of their porous structure, ultra-large specific surface area, abundant active sites, and specific surface charge. Recently, light-response MOFs have received considerable research interests regarding their potential applications in environmental remediation, medical treatment, and artificial intelligence. This review systematically summarizes the recent progress of light-response MOFs and MOF-based composites for light-response adsorption/desorption. The fabrication strategies of light-response MOFs, including in situ synthesis, post-synthesis modification, and introduction of guest molecules, are presented. The mechanisms of light-induced structural change and light-responsive adsorption/desorption are summarized. The prospects for further development of light-response MOFs are discussed. The facile regeneration of light-response MOF-based adsorbents by light irradiation is highly promising for energy saving, environmental friendliness, and sustainability.

关键词： Light response Metal–organic frameworks Adsorption Desorption Mechanism

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