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Fabrication and characterization of nanoporous Ag-Pt alloy

Rare Metals 2021年第5期40卷 1203-1207页

作者： Tao Yin Fan-Yun Meng Min Zhang Ying-Wei Yan Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Engineering Research Centre of Natural Medicine Ministry of EducationFaculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China School of Mechanical Electronic and Control EngineeringMaterials Science and Engineering Research CenterBeijing Jiaotong UniversityBeijing 100044China

Nanoporous Ag-Pt bi-metallic alloy was fabricated by free dealloying of amorphous Ag-based precursor with the nominal composition of *** noble Ag and Pt were left after the less noble Cu and Si dissolved in a certain acid ***-continuous nanoporous microstructure was formed with asymmetric ligaments and pores with typically 30-200 nm in *** trace addition of Pt has refined the grains of the ligaments to the average size of less than 20 nm in the substrate and induced the formation of rods with *** morphologies of the rods were observed by scanning electron microscopy(SEM)and transmission electron microscopy(TEM)both in the form of clusters and as scattered individuals with characteristic length of several micrometers and diameter of tens of *** grains sizes in the rods were finer than those in the *** good mechanical integrity might be due to the combination of continuous ligaments and clusters of rods.

关键词： Nanoporous Ag-Pt alloy Amorphous precursor Dealloying Nanograins

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Fluoroalkylated tin-oxo nano clusters as resist candidates for extreme UV lithography 40

Fluoroalkylated tin-oxo nano clusters as resist candidates f...

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Advances in Patterning materials and Processes XL 2023

作者： Ku, Yejin Ahn, Hyungju Lee, Jin-Kyun Kim, Jiho Park, Byeong-Gyu Lee, Sangsul Jang, Yu Ha Jung, Byung Jun Koh, Chawon Nishi, Tsunehiro Kim, Hyun-Woo Program in Environment and Polymer Engineering Inha University Incheon22212 Korea Republic of Department of Polymer Science and Engineering Inha University Incheon22212 Korea Republic of Pohang Accelerator Laboratory Postech Pohang37673 Korea Republic of Department of Materials Science and Engineering University of Seoul Seoul02504 Korea Republic of Samsung Electronics Co. Ltd. Semiconductor R and D Center Gyeonggi-do18448 Korea Republic of

ISBN: (纸本)9781510661035

Extreme UV (EUV) lithography is entering full-scale production of high-end IC chips. This transition gives researchers in academia and industry ample motivation to propose new chemistries that will contribute to alleviating the resolution-line edge roughness-sensitivity trade-off dilemma of EUV lithography. We also have a great interest in the radical chemistry of carbon-fluorine bonds working under EUV and have explored its applicability as a platform for implementing novel EUV resists. While it was checked that the chemical concept is viable by using fluorinated small molecules and polymers, it needed to be upgraded in terms of patterning resolution and sensitivity. Recently, we extended successfully the radical-based strategy to the tin-oxo nano cluster resist concept. Soluble fluorinated tin-oxo clusters could be prepared, and they were cast into thin films from a fluorous solution. When the thin film was exposed to EUV radiation, it lost solubility, resulting in the formation of negative-tone images. Under an EUV lithographic condition, the thin film could be tailored down to 10 nm or smaller sized features. In addition, their unique solubility in chemically orthogonal solvents also enabled the build-up of a bilayer structure composed of a non-fluorinated reactive polymer underlayer without curing. The stacked film structure was found to be helpful for the sensitivity improvement. These results propose another interesting EUV resist candidate possessing unique capabilities in thin film processing. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Tin

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High Frequency LLSAW Filters With Higher Order Modes Elimination Based on LiNbO3/SiO2/Sapphire Substrate

High Frequency LLSAW Filters With Higher Order Modes Elimina...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Boyuan Xiao Sulei Fu Huiping Xu Peisen Liu Qiufeng Xu Xinchen Zhou Qiaozhen Zhang Rui Wang Cheng Song Fei Zeng Weibiao Wang Feng Pan Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing China College of Information Mechanical and Electrical Engineering Shanghai Normal University Shanghai China SHOULDER Electronics Limited Wuxi China

ISBN: (数字)9798350371901

ISBN: (纸本)9798350371918

In this study, we focus on developing high-frequency longitudinal leaky surface acoustic wave (LLSAW) filters with efficient suppression of spurious modes. A sapphire-based platform, chosen for its appropriate acoustic velocity, was systematically optimized to enhance LLSAW excitation while minimizing spurious modes. The dispersion characteristics were evaluated by finite element analysis, and robust main mode excitation and suppression of higher order modes was achieved through electrode thickness optimization. The resulting LLSAW resonators fabricated on 32°Y-45°X LiNbO 3 (LN)/SiO 2 /sapphire platform demonstrates substantial suppression of higher order modes over a frequency range from 3.5 to 7 GHz and achieve a maximum quality factor (Q max ) of 890 for LLSAW mode. Subsequently, 3.51 GHz, 4.08 GHz and 4.82 GHz LLSAW filter with insertion loss (IL min ) of 1.59 dB, 2.43 dB and 2.13 dB were realized, exhibiting excellent out-of-band (OoB) performance up to 7 GHz.

关键词： Electrodes Q-factor Surface acoustic waves Cutoff frequency Resonator filters Resonant frequency Finite element analysis Resonators Substrates Optimization

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Properties and mechanism of ionic liquid/silicone oil based magnetorheological fluids

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International Journal of Smart and Nano materials 2022年第2期13卷 263-272页

作者： Yu Tong Penghui Zhao Xiaoguang Li Ning Ma Xufeng Dong Chenguang Niu Zhanjun Wu Min Qi School of Materials Science and Engineering Dalian University of TechnologyDalianPeople’s Republic of China School of Aeronautics and Astronautics Dalian University of TechnologyDalianPeople’s Republic of China School of Civil Engineering Dalian University of TechnologyDalianPeople’s Republic of China School of Mechanical and Transportation Engineering Taiyuan University of TechnologyTaiyuanPeople’s Republic of China Taiyuan Tongze Heavy Industry Co LtdTaiyuanPeople’s Republic of China

A magnetorheological fluid(MRF)is a smart composite suspension composed of nonmagnetic liquid and soft magnetic *** fluids can considerably influence the performance of MRFs;therefore,to investigate the effect of carrier fluids on MRFs,an SO/IL-MRF was prepared by mixing an ionic liquid(IL)with silicone oil(SO)in this *** types of MRF samples were prepared for experiments(pure SO,pure IL,and SO/IL).According to the experi-mental results,the SO/IL-MRF has better sedimentation stability than those based on pure SO and pure ***,three methods were used to determine the shear yield stresses of the *** SO/IL-MRF achieved a higher shear yield stress than those of the other two because a network structure is formed between the ionic fragments and the molecular chains of the SO in the SO/*** increases the movement resistance of the particles in the carrier fluid,and it is unlike the mechanism of the IL-enhanced *** work provides new ideas for improving the MRF performance.

关键词： Magnetorheological fluids ionic liquid mixed carrier fluid sedimentation yield stress

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Large-Scale Distributed Multidisciplinary Design Optimization of the NASA Lift-Plus-Cruise Air Taxi Concept

Large-Scale Distributed Multidisciplinary Design Optimizatio...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： van Schie, Sebastiaan P. C. Ruh, Marius L. Fletcher, Andrew Warner, Michael Sperry, Mark Scotzniovsky, Luca Orndorff, Nicholas C. Xiang, Ru Yan, Jiayao Zhao, Han Krokowski, Joshua J. Chen, J.S. Sarojini, Darshan Gill, Hyunjune Lee, Seongkyu Tagg, Andrew Anderson, Ryan Green, Eric Joseph, Cibin Ning, Andrew Cheng, Zeyu Cao, Zhi Mi, Chunting Guibert, Alexandre T. R. Cronk, Ashley Kim, H. Alicia Meng, Y. Shirley Silva, Christopher Hwang, John T. University of California San Diego 9500 Gilman Dr La Jolla CA92093 United States Department of Mechanical and Aerospace Engineering University of California San Diego 9500 Gilman Dr La Jolla CA92093 United States Department of Structural Engineering University of California San Diego 9500 Gilman Dr La Jolla CA92093 United States Aerospace and Ocean Engineering Department Virginia Tech 1600 Innovation Dr BlacksburgVA24060 United States Department of Mechanical and Aerospace Engineering University of California Davis 1 Shields Avenue DavisCA95616 United States Mechanical Engineering Brigham Young University ProvoUT84602 United States Department of Electrical & Computer Engineering San Diego State University 5500 Campanile Dr San Diego92182 United States Structural Engineering Department University of California San Diego 9500 Gilman Dr La Jolla CA92093 United States Materials Science & Engineering Program University of California San Diego 9500 Gilman Dr La Jolla CA92093 United States Pritzker School of Molecular Engineering The University of Chicago ChicagoIL60607 United States NASA Ames Research Center Moffett FieldCA94035 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Large-scale gradient-based Multidisciplinary Design Optimization (MDO) can aid in the exploration of high-dimensional design spaces for novel air vehicle concepts, thereby leading to more efficient and economic designs. This paper builds on past works where we demonstrated large-scale physics-based MDO capabilities and applied these to NASA’s lift-plus-cruise electric air taxi concept. We extend this comprehensive mid-fidelity system-level optimization problem with high(er)-fidelity subsystem-level optimizations of various aircraft systems and mission phases, with the aim of further enhancing the accuracy and scope of the aforementioned system-level optimization problem: 1) Power minimization during the transition mission phase;2) Electrical powertrain topology optimization;3) Cell chemistry modeling and thermomechanical battery pack topology optimization;4) Shell-based coupled aero-elastic wing structure optimization. An Analytical Target Cascading-like distributed MDO architecture allows us to couple the system- and subsystem-level optimizations in order to arrive at a consistent and feasible design. We find that the system-level design is most heavily impacted by the reduced battery pack-level energy densities that stem from power peaks in the mission profile. These power peaks seem to result from the inefficient lift rotor blade designs that are needed to satisfy noise constraints. We draw conclusions based on trends in our results and give recommendations for future MDO studies of electrical air taxi vehicle concepts. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Shape optimization

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Arduino-based Smart Flowmeter System with Frequency-to-Flowrate Mechanism

Arduino-based Smart Flowmeter System with Frequency-to-Flowr...

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Conference on Artificial Intelligence and Robotics and Asia-Pacific International Symposium

作者： Seyed Sadra Razavi Amirhosein Mansouri Amin Feyz Bashipour Department of Mechanical Automotive and Materials Engineering University of Windsor Toronto Canada Renewable Energy Engineering Department Shahid Beheshti University Tehran Iran School of Automotive Engineering Iran University of Science and Technology Toronto Canada

Flow measurement is one of the important requirements in various industries, and this method directly affects the quality and performance efficiency of the system. If mechanisms with better efficiency and higher accuracy are introduced, the security of industries such as energy improves. In this paper, the performance of an industrial flowmeter is improved based on programming techniques, and its structure is described.

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Nonlinear Analysis of Indentation-Fragmentation Regimes in Low-Speed Impact System

SSRN

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SSRN 2024年

作者： Tonnanavar, Sanketh Shivakumar, N.D. Simha, K.R.Y. Shrikanth, Venkoba Department of Design and Manufacturing Indian Institute of Science Karnataka Bangalore560012 India Department of Mechanical Engineering Indian Institute of Science Karnataka Bangalore560012 India Department of Mechanical Materials and Aerospace Engineering Indian Institute of Technology Karnataka Dharwad580011 India

The dynamics of low-speed impact between finite elastic solids and compact objects has been previously explored. However, it is not entirely insightful about fracture and fragmentation instabilities in the two-body collision. Additionally, pinpointing the instability-driven transient phases in low-speed impact systems becomes challenging through experiments. The primary objective of this work is to interpret the critical state of fragmentation as a heteroclinic bifurcation. The said bifurcation clearly but subtly demarcates a non-penetrating collision from a penetrating one;when a hard indenter transversely impacts a finite brittle plate. Based on the drop weight impact experiments, the impact system is modeled as a single-degree spring-mass system by recasting the Hertzian impact theory for modeling the phenomenon of indentation-fragmentation bifurcation on the phase portrait. A secondary objective is to execute numerical simulations to support the bifurcation model and experimental observations that reveal the interplay of control parameters, such as energy, momentum, impulse, impact duration, and coefficient of restitution (COR);and their individual and simultaneous influence on bifurcation. The simulation outcomes also highlight the conspiring effect of wave propagation and vibromechanics in the impending fragmentation. © 2024, The Authors. All rights reserved.

关键词： Nonlinear analysis

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The impact of sintering temperatures on the microstructure and mechanical characteristics of TiB2-TiN-Al0.3CoCrFeNi ultrafine cermets using in-situ reaction hot pressing

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Ceramics International 2025年

作者： Fang, Yihang Zhao, Xianrui Wu, Tao Chen, Guang Xia, Lingqin Wang, Ruiquan Zhang, Lingfeng Xie, Tingting Zhang, Mengxian Xie, Xinyi School of Additive Manufacturing Zhejiang Polytechnic University of Mechanical and Electrical Engineering Hangzhou310053 China School of Naval Architecture & Ocean Engineering Jiangsu Maritime Institute Nanjing211170 China Jiangxi Provincial Engineering Research Center of Materials Surface Remanufacturing School of Materials Science and Engineering Jiujiang University Jiujiang332005 China School of Intelligent Manufacturing Wenzhou Polytechnic Wenzhou325035 China

This study employs Ti, BN, and Al0.3CoCrFeNi (HEA) high-entropy alloy as the principal material and implements the in-situ reaction synthesis method to fabricate ultrafine-grained TiB2-TiN-HEA cermet composite materials. This study examines the influence of sintering temperature on the microstructure and mechanical characteristics of the cermet composite. These results indicate that the cermets exhibit TiN, TiB2, and face-centred cubic (FCC) phases at varying temperatures. The morphology of the TiB2 grains is influenced mainly by the dissolution, extraction, and growth of TiB2 within the liquid phase of the HEA. At a sintering temperature of 1400 °C, the cermets achieve peak hardness and density;however, elevating the temperature to 1450 °C results in ideal flexural strength and fracture toughness. Moreover, grain size incrementally increases with elevated temperature. When the temperature is above 1450 °C, the grain size is below 0.5 μm, displaying ultrafine-grained characteristics. The microstructural evolution process in cermet composites is elucidated: formation of a hard phase framework, dissolution, void infill, reorganization of the secondary liquid phase, and cooling-extraction-growth. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Fracture toughness

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Strain gradient induced grain refinement far below the size limit in a low carbon hypoeutectoid steel(0.19 wt%C)via pipe inner surface grinding treatment

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Journal of materials science & Technology 2021年第19期78卷 155-169页

作者： Wenqiang Li Yiming Zhao Ning Liu Changji Li Ruiming Ren Dayong Cai Hongwang Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China National Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Liren College of Yanshan University Yanshan UniversityQinhuangdao 066004China School of Materials Science&Engineering Dalian Jiaotong UniversityDalian 116028China Qinhuangdao Vocational and Technical College Qinhuangdao 066100China

A low carbon hypoeutectoid steel(0.19 wt%C)with proeutectoid ferrite and pearlite dual-components was subjected to surface plastic deformation via pipe inner surface grinding(PISG)at room *** deformation microstructures for each component were systematically characterized along depth,and the patterns of structural evolution toward nanometer regime as well as the governing parameters were *** ferrite grains were refined down to 17 nm,and the pattern covering a length scale of 4–5 orders of magnitude from micron-to nanometer-scale follows:formation of cellular dislocation structure(CDS),elongated dislocation structure(EDS),ultrafine lamellar structure(UFL)and finally the nanolaminated structure(NL).The pearlite experiences the deformation and refinement,and finally the transforming the ultrafine pearlite(UFP)into nanolaminated pearlite(NLP)with the ferrite lamellae as thin as 20 *** for both UFL(UFP)and NL(NLP)can be realized via forming novel extended boundaries within ferrite lamellae.A critical lattice curvature of~2.8°is required for forming such extended boundary,corresponding to a minimum strain gradient of 0.25μm^(-1)for a 100 nm-thick *** below size limit(expressed by lamellar thickness d_Tin nm)is correlated with the strain gradient(χ,inμm^(-1))by:d_T=12.5/*** contributions from strain gradient caused by PISG processing and material heterogeneity were discussed.

关键词： Strain gradient Grain refinement Size limit Low carbon hypoeutectoid steel Pipe inner surface grinding

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Rigidity Transition in Chalcogenide Glasses: Dynamic Nano-Indentation and Diffuse Reflectance Spectroscopic Studies

Rigidity Transition in Chalcogenide Glasses: Dynamic Nano-In...

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2022 IEEE International Conference on Emerging Electronics, ICEE 2022

作者： Chaturvedi, Abhishek Varma, G. Sreevidya Sundararajan, Asokan Ramamurty, Upadrasta Indian Institute of Science Department of Materials Engineering Bangalore560012 India Bengaluru560012 India Cmr University Department of Basic Science and Humanities Bagalur Bangalore562149 India Indian Institute of Science Department of Instrumentation and Applied Physics Bangalore560012 India School of Mechanical and Aerospace Engineering College of Engineering Nanyang Technological University Singapore

ISBN: (纸本)9781665491853

Rigidity Transitions in quaternary glasses were investigated using dynamic nanoindentation and DRS reflectance spectroscopy in Ge 15Te 80-xIn 5Ag x glasses. In quasi-static properties such as reduced modulus, E r and hardness, H, an extended rigidity transition with distinct floppy, intermediate and rigid phase is observed, while indentation toughness, K c and brittleness index, BI exhibits a rigidity transition at x =12. Floppy modes exhibit higher K c values when compared to rigid modes. Dynamic visco-elastic property, storage modulus vs frequency, f exhibits a trend reversal for floppy and rigid phases, which is attributed to difference in heat losses. The manifestation of intermediate phase (IP) in optical band gap E g) is observed in the composition range (8 ≤ x ≤ 14) at. %. © 2022 IEEE.

关键词： Glass

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