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AISTech 2024 Iron and Steel Technology Conference

作者： Zakeri, Ali Coley, Kenneth Tafaghodi, Leili McMaster University Department of Materials Science and Engineering McMaster University HamiltonONL8S 4L7 Canada Western University Department of Mechanical and Materials Engineering Western University LondonONN6A 3K7 Canada

ISBN: (纸本)9780930767259

In recent years, the hydrogen-based direct reduction process has emerged as a sustainable solution to mitigate CO2 emissions. This paper presents the results of research focusing on the reduction behavior of industrial hematite pellets. The investigation involved using a custom-built thermogravimetric setup, which allowed for precise weight loss measurements during the reduction. The isothermal reduction experiments were conducted at 800°C under pure hydrogen. The surface morphology, microstructure, and chemical composition were investigated for an initial stage (33% reduced), an intermediate state (50% reduced), and near-complete reduction (>95% reduced). The results revealed a significant difference in the morphology of reduction products and metallization along the pellet radius. © 2024 by the Association for Iron & Steel Technology.

关键词： Morphology

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Concurrent hetero-/homo-geneous electrocatalysts to bi-phasically mediate sulfur species for lithium-sulfur batteries

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Journal of Energy Chemistry 2024年第6期93卷 663-668,I0016页

作者： Rui-Bo LingHu Jin-Xiu Chen Jin-Hao Zhang Bo-Quan Li Qing-Shan Fu Gulnur Kalimuldina Geng-Zhi Sun Yunhu Han Long Kong Xi’an Institute of Flexible Electronics(IFE) Northwestern Polytechnical UniversityXi’an 710129ShaanxiChina Institute of Advanced Materials Nanjing Tech UniversityNanjing 211816JiangsuChina Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Department of Mechanical and Aerospace Engineering School of Engineering and Digital SciencesNazarbayev UniversityKabanbay Batyr Ave.53Astana 010000Kazakhstan

Expediting redox kinetics of sulfur species on conductive scaffolds with limited charge accessible surface is considered as an imperative approach to realize energy-dense and power-intensive lithium-sulfur(Li-S)*** this work,the concept of concurrent hetero-/homo-geneous electrocatalysts is proposed to simultaneously mediate liquid-solid conversion of lithium polysulfides(LiPSs)and solid lithium disulfide/sulfide(Li_(2)S_(2)/Li_(2)S)propagation,the latter of which suffers from sluggish reduction kinetics due to buried conductive scaffold surface by extensive deposition of Li_(2)S_(2)/Li_(2)*** selected model material to verify this concept is a two-in-one catalyst:carbon nanotube(CNT)scaffold supported iron-cobalt(Fe-Co)alloy nanoparticles and partially carbonized selenium(C-Se)*** Fe-Co alloy serves as a heterogeneous electrocatalyst to seed Li_(2)S_(2)/Li_(2)S through sulphifilic active sites,while the C-Se sustainably releases soluble lithium polyselenides and functions as a homogeneous electrocatalyst to propagate Li_(2)S_(2)/Li_(2)S via solution *** bi-phasic mediation of the sulfur species benefits reduction kinetics of LiPS conversion,especially for the massive Li_(2)S_(2)/Li_(2)S growth scenario by affording an additional solution directed route in case of conductive surface being largely *** strategy endows the Li-S batteries with improved cycling stability(836 mA h g^(-1)after 180 cycles),rate capability(547 mA h g^(-1)at 4 C)and high sulfur loading superiority(2.96 mA h cm^(-2)at 2.4 mg cm^(-2)).This work hopes to enlighten the employment of bi-phasic electrocatalysts to dictate liquid-solid transformation of intermediates for conversion chemistry batteries.

关键词： Lithium-sulfur batteries Electrocatalysis Lithium polysulfides Sulfur cathode Energy density

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Sequence-Defined Nanotubes Assembled from IR780-Conjugated Peptoids for Chemophototherapy of Malignant Glioma

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Research 2021年第1期2021卷 1379-1390页

作者： Xiaoli Cai Mingming Wang Peng Mu Tengyue Jian Dong Liu Shichao Ding Yanan Luo Dan Du Yang Song Chun-Long Chen Yuehe Lin School of Mechanical and Materials Engineering Washington State UniversityPO Box 642920 PullmanWashington 99164USA Physical Sciences Division Pacific Northwest National LaboratoryRichlandWA 99352USA Department of Mechanical Engineering and Materials Science and Engineering Program State University of New YorkBinghamtonNew York 13902USA

Near-infrared(NIR)laser-induced phototherapy through NIR agents has demonstrated the great potential for cancer ***,insufficient tumor killing due to the nonuniform heat or cytotoxic singlet oxygen(1 O2)distribution over tumors from phototherapy results in tumor recurrence and inferior *** achieve high tumor killing efficacy,one of the solutions is to employ the combinational treatment of phototherapy with other modalities,especially with chemotherapeutic *** this paper,a simple and effective multimodal therapeutic system was designed via combining chemotherapy,photothermal therapy(PTT),and photodynamic therapy(PDT)to achieve the polytherapy of malignant glioma which is one of the most aggressive tumors in the ***-780(IR780)dye-labeled tube-forming peptoids(PepIR)were synthesized and self-assembled into crystalline nanotubes(PepIR nanotubes).These PepIR nanotubes showed an excellent efficacy for PDT/PTT because the IR780 photosensitizers were effectively packed and separated from each other within crystalline nanotubes by tuning IR780 density;thus,a self-quenching of these IR780 molecules was significantly ***,the efficient DOX loading achieved due to the nanotube large surface area contributed to an efficient and synergistic chemotherapy against glioma *** the unique properties of peptoids and peptoid nanotubes,we believe that the developed multimodal DOX-loaded PepIR nanotubes in this work offer great promises for future glioma therapy in clinic.

关键词： chemotherapy IR780 modal

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Aerosol jet printing of piezoelectric surface acousticwave thermometer

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Microsystems & Nanoengineering 2023年第3期9卷 31-42页

作者： Nicholas McKibben Blake Ryel Jacob Manzi Florent Muramutsa Joshua Daw Harish Subbaraman David Estrada Zhangxian Deng Micron School of Materials Science and Engineering Boise State University1910 W University DriveBoiseID 83725USA Department of Mechanical and Biomedical Engineering Boise State UniversityBoiseID 83725USA School of Electrical Engineering and Computer Science Oregon State University2500 NW Monroe AvenueCorvallisOR 97331USA Idaho National Laboratory Idaho FallsID 83415USA Center for Advanced Energy Studies Idaho FallsID 83401USA

Surface acoustic wave(SAW)devices are a subclass of micro-electromechanical systems(MEMS)that generate an acoustic emission when electrically *** transducers also work as detectors,converting surface strain into readable electrical *** properties of the generated SAW are material dependent and influenced by external factors like *** monitoring temperature-dependent scattering parameters a SAW device can function as a thermometer to elucidate substrate *** fabrication of SAW sensors requires labor-and cost-intensive subtractive processes that produce large volumes of hazardous *** study utilizes an innovative aerosol jet printer to directly write consistent,high-resolution,silver comb electrodes onto a Y-cut LiNbO3 *** printed,two-port,20 MHz SAW sensor exhibited excellent linearity and repeatability while being verified as a thermometer from 25 to 200℃.Sensitivities of the printed SAW thermometer are−96.9×10^(−6)℃^(−1)and−92.0×10^(-6)℃^(−1) when operating in pulse-echo mode and pulse-receiver mode,*** results highlight a repeatable path to the additive fabrication of compact high-frequency SAW thermometers.

关键词： scattering wave surface

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Fabrication and photoluminescence characteristics of novel red-emitting Ba_(2)LuNbO_(6):Eu^(3+)double-perovskite phosphors on near UV WLEDs

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Journal of Rare Earths 2022年第8期40卷 1173-1180页

作者： Haihong Guo Ting Wang Bitao Liu Wei Gao Liang Xiu Zhenen Cui Hao Zhang Qianrui Ma Shaoqing Wang Ziyang Li Longchao Guo Guilong Yan Siufung Yu Xue Yu Xuhui Xu Jianbei Qiu College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China The Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong 999077China Research Institute for New Materials Technology Chongqing University of Arts and SciencesChongqing 402160China College of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China School of Mechanical Engineering Chengdu UniversityChengdu 610059China

Red emitting phosphors play a significant role in accelerating the improvement of illumination quality for white light emitting diodes(WLEDs).In this work,by using solid-state reaction method,an efficient novel Ba_(2)LuNbO_(6):Eu^(3+)phosphor with double-perovskite structure was successfully ***,a series of Ba_(2)LuNbO_(6):Eu^(3+)red phosphors can be efficiently pumped by the near-ultraviolet(UV)light and then present high-brightness at orange emission(598 nm,~5D_(0)→~7 F_(1))and red emission(610 nm,~5D_(0)→~7 F_(2)).The ratio values of 610 to 598 nm in Ba_(2)LuNbO_(6):Eu^(3+)phosphors exceed 1 when the content of Eu^(3+)is larger than 0.4 mol,because the occupation of Eu^(3+)ions is changed from Lu^(3+)ions with symmetric sites to Ba^(2+)ions with asymmetric ***,the optimized concentration of Eu^(3+)at the~5D_(0)→~7 F_(2)transitions is obtained when x=1,indicating that there is non-concentration quenching in Ba_(2)LuNbO_(6):Eu^(3+)***,the CIE chromaticity coordinates of Ba_(2)LuNbO_(6):Eu^(3+)was calculated to be(0.587,0.361),the color purity was calculated to be 72.26%and internal quenching efficiency(IQE)was measured to be 67%.Finally,the thermal stability of Ba_(2)LuNbO_(6):Eu^(3+)phosphors was also *** work demonstrates that the novel double-perovskite red-emitting Ba_(2)LuNbO_(6):Eu^(3+)phosphors are prospective red emitting elements for WLEDs applications.

关键词： Ba_(2)LuNbO_(6):Eu^(3+) phosphors Non-concentration quenching Double-perovskite Red emitting Rare earths

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Space Charge Induced Flexoelectric Transducers for Energy Harvesting 21

Space Charge Induced Flexoelectric Transducers for Energy Ha...

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21st International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2022

作者： Kazemi, Arash Peters, Travis Trolier-Mckinstry, Susan Roundy, Shad University of Utah Department of Mechanical Engineering United States The Pennsylvania State University Department of Materials Science and Engineering Materials Research Institute United States

ISBN: (纸本)9781665493062

Lead zirconate titanate (PZT) is widely used in energy harvesting because of its excellent material properties. However, as the material contains lead, there are significant environmental concerns with its production and use. Flexoelectricity refers to the coupling between strain gradient and electric polarization that exists, in principle, in all dielectric materials and would allow for energy harvesting without using piezoelectric materials. However, the effect is very weak in most materials. Promisingly, it has recently been shown that space charge polarized materials (i.e., semiconducting materials with insulating barrier layers) can exhibit enhanced flexoelectricity. This space charge induced flexoelectric effect opens up the possibility of a non-toxic replacement for PZT in energy harvesting applications. In this paper we investigate the use of doped silicon with hafnium oxide insulating layers as flexoelectric transducers that could replace PZT in many applications including energy harvesting. Specifically, we experimentally demonstrate flexoelectricity in a bending beam and show an effective flexoelectric coefficient of 4.9 μC/m. Finally, we develop and demonstrate a finite element model for flexoelectricity. © 2022 IEEE.

关键词： Piezoelectricity

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Influence of layer thickness on formation quality,microstructure,mechanical properties,and corrosion resistance of WE43 magnesium alloy fabricated by laser powder bed fusion

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Journal of Magnesium and Alloys 2024年第4期12卷 1367-1385页

作者： Bangzhao Yin Jinge Liu Bo Peng Mengran Zhou Bingchuan Liu Xiaolin Ma Caimei Wang Peng Wen Yun Tian Yufeng Zheng State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Institute for Precision Medicine Tsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Beijing AKEC Medical Co. Ltd.Beijing 102200China School of Materials Science and Engineering Peking UniversityBeijing 100871China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China

Laser powder bed fusion(L-PBF)of Mg alloys has provided tremendous opportunities for customized production of aeronautical and medical *** thickness(LT)is of great significance to the L-PBF process but has not been studied for Mg *** this study,WE43 Mg alloy bulk cubes,porous scaffolds,and thin walls with layer thicknesses of 10,20,30,and 40μm were *** required laser energy input increased with increasing layer thickness and was different for the bulk cubes and porous *** tended to occur at the connection joints in porous scaffolds for LT40 and could be eliminated by reducing the laser energy *** thin wall parts,a large overhang angle or a small wall thickness resulted in porosity when a large layer thicknesses was used,and the porosity disappeared by reducing the layer thickness or laser energy input.A deeper keyhole penetration was found in all occasions with porosity,explaining the influence of layer thickness,geometrical structure,and laser energy input on the *** the samples achieved a high fusion quality with a relative density of over 99.5%using the optimized laser energy *** increased layer thickness resulted to more precipitation phases,finer grain sizes and decreased grain *** the similar high fusion quality,the tensile strength and elongation of bulk samples were significantly improved from 257 MPa and 1.41%with the 10μm layer to 287 MPa and 15.12%with the 40μm layer,in accordance with the microstructural *** effect of layer thickness on the compressive properties of porous scaffolds was ***,the corrosion rate of bulk samples accelerated with increasing the layer thickness,mainly attributed to the increased number of precipitation phases.

关键词： Magnesium alloy WE43 Laser powder bed fusion Layer thickness Process optimization

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ITO纳米晶-植物纤维复合材料的电阻式压力传感器

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science China materials 2023年第10期66卷 3922-3930页

作者：夏亿劼黄鹏举林心铭吴鲁超李珂高晨溟钟高余 School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Materials Science Fudan UniversityShanghai 200433China

可穿戴电子设备因其在机器人触觉、人机交互和脉搏测试等领域具有潜在应用而引起广泛关注.作为一种可穿戴电子设备,柔性压力传感器应该是环保的,而且制造成本低.基于纤维素纸的压力传感器由于其优良的特性,如轻质、无毒或低毒、可降解... 详细信息

可穿戴电子设备因其在机器人触觉、人机交互和脉搏测试等领域具有潜在应用而引起广泛关注.作为一种可穿戴电子设备,柔性压力传感器应该是环保的,而且制造成本低.基于纤维素纸的压力传感器由于其优良的特性,如轻质、无毒或低毒、可降解性和柔韧性,而引起了人们的关注.在此,我们报道了一种基于铟锡氧化物(ITO)纳米晶体和植物纤维复合材料的电阻式触觉传感器.该压力传感器具有宽的检测范围(0-100 kPa)、高灵敏度(464.88 kPa^(-1))、快速的响应时间(6.93 ms)和恢复时间(7.18 ms)以及良好的加载/卸载稳定性.我们还展示了该压力传感器用于脉搏测试、呼吸监测、语音识别等各种人体运动检测.结果表明,ITO纳米晶-植物纤维复合材料压力传感器在智能可穿戴电子产品中显示出巨大应用潜力.

关键词： pressure sensors piezoresistance nanocrystalline composite

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SiO2-reinforced Poly (methyl methacrylate): Tribology Performance as Service Life Sensor

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Sensors and materials 2023年第8-2期35卷 2845-2854页

作者： Shi, Shih-Chen Zeng, Xin-Xing Chen, Tao-Hsing Wang, Chih-Chia Lin, Yue-Feng Department of Mechanical Engineering National Cheng Kung University No. 1 University Road Tainan City70101 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology No. 415 Jiangong Rd. Sanmin Dist. Kaohsiung City807618 Taiwan Department of Chemical and Materials Engineering Chung Cheng Institute of Technology National Defense University No. 75 Shiyuan Road Taoyuan335009 Taiwan System Engineering and Technology Program National Yang Ming Chiao Tung University No. 1001 University Road Hsinchu300093 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology No. 57 Sec. 2 Zhongshan Rd. Taiping Dist. Taichung411030 Taiwan

Poly (methyl methacrylate) (PMMA), which is suitable for use in the human body owing to its biocompatibility, is commonly used in medical applications such as bone nails, bone cement, and dentures. However, owing to its hard and brittle nature, PMMA can cause damage when it is subjected to excessive stress and can also cause severe wear. In this study, three different sizes of silica particles were used as reinforcing additives to enhance the wear resistance of PMMA composites. A pin-on-disk wear test was conducted to record the coefficient of friction and wear volume, and the wear volume was measured using a 3D laser scanning microscope. In the wear test, the transfer film of micron and submicron particles produced a plowing effect, resulting in wide grooved wear scars and a higher wear rate than the raw material. The nanoparticle transfer film reduced direct material wear, the wear scars were fine and flat, and the wear rate was decreased, reducing the wear of SiO2-reinforced PMMA composites by 40%. The experimental results revealed that the wear volume is proportional to the wear time. In addition, the observed area of the transfer film on the wear counterpart can be used as a service life sensor of the coating material. © MYU K.K.

关键词： Tribology

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Polarization-directed nanophotonic routers based on twodimensional inorganic molecular crystals

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InfoMat 2024年第8期6卷 111-118页

作者： Jiacheng Yao Xin Feng Tingting Zhang Fangqi Chen Zhenglong Zhang Hairong Zheng Tianyou Zhai Tao Ding Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhanthe People's Republic of China State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanthe People's Republic of China Department of Mechanical Engineering The University of Texas at DallasRichardsonTexasUSA School of Physics and Information Technology Shaanxi Normal UniversityXi'anthe People's Republic of China

Photonic and plasmonic hybrid nanostructures are the key solution for integratednanophotonic circuits with ultracompact size but relative low loss. However,the poor tunability and modulability of conventional waveguides makesthem cumbersome for optical multiplexing. Here we make use of twodimensionalmolecular crystal, α-Sb_(2)O_(3) as a dielectric waveguide via totalinternal reflection, which shows polarization-sensitive modulation of the propagatingbeams due to its large polarization mode dispersion. Both experimentsand simulations are performed to verify such concept. These Sb_(2)O_(3) nanoflakescan be coupled with plasmonic nanowires to form nanophotonic beam splittersand routers which can be easily modulated by changing the polarization of theincidence. It thus provides a robust, exploitable and tunable platform for onchipnanophotonics.

关键词： nanoflakes plasmonics polarization Sb_(2)O_(3) waveguides

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