检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Chang, May Shin Mohd Salleh, Mohd Arif Anuar Somidin, Flora Che Halin, Dewi Suriyani Yasuda, Hideyuki Nogita, Kazuhiro Taman Muhibbah Jejawi Perlis Arau02600 Malaysia Department of Materials Science and Engineering Kyoto University Sakyo-ku Kyoto606-8501 Japan School of Mechanical and Mining Engineering The University of Queensland BrisbaneQLD4072 Australia

The effects of 0.05wt%Ni additions on In-35wt%Sn (In-35Sn) alloy on the ex-situ interfacial reactions, in-situ microstructures formation during solidification, and mechanical properties during reflow soldering on Cu substrate were systematically studied. Reaction of In-35Sn with Cu resulted in the formation of two intermetallic Cu3(Sn,In) layers were found at the interface. When Ni is added, Ni is participated in the interfacial (Cu,Ni)3(Sn,In) layer formed at the In-35Sn-0.05Ni/Cu interface, causing the morphology of the IMC layer at the solder side to become more refined. Adding Ni resulted in the degree of undercooling In-35Sn decreasing close to zero. The in-situ real-time synchrotron x-ray imaging confirmed that the presence of Ni is responsible for the spontaneous β-In3Sn grain nucleation and formation of equiaxed grain in the solder joint. The grain refinement on the (Cu,Ni)3(Sn,In) IMC layer in In-35Sn-0.05Ni/Cu solder joint leads to minor increment in the shear strength. This study demonstrated the effectiveness of Ni microalloying in low temperature In-35Sn/Cu solder joint in modifying the β-In3Sn dendrite growth at the bulk solder and the microstructure refinement at the interface of the solder joints, which could potentially enhance the overall joint strength. © 2023, The Authors. All rights reserved.

关键词： Morphology

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Comparison of CMAS corrosion and sintering induced microstructural characteristics of APS thermal barrier coatings

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Journal of materials science & Technology 2019年第3期35卷 440-447页

作者： Yiyou Wu Hua Luo Canying Cai Yanguo Wang Yichun Zhou Li Yang Guangwen Zhou School of Materials Science and Engineering Xiangtan University Key Laboratory of Low Dimensional Materials & Application Technology of Ministry of Education Xiangtan University Department of Mechanical Engineering & Materials Science and Engineering Program State University of New York at Binghamton

The microstructural features of high-temperature sintered and CaO-MgO-Al_2O_3-SiO_2(CMAS) corroded air plasma sprayed Y_2O_3 stabilized ZrO_2(YSZ) thermal barrier coatings(TBCs) under the thermal gradient condition were comparatively studied. As-sprayed YSZ has a lamellar structure and the lamellae are composed of closely aligned columnar crystals. The sintered and the CMAS corroded YSZ coatings maintain the t'-ZrO_2 phase as the as-sprayed YSZ coating. The sintered YSZ remains the lamellar structure with reduced interlamellar gaps and grains coarsening. After the CMAS corrosion, the top layer of the YSZ coating keeps its lamellar structure consisting of some columnar grains with the CMAS infiltration into the intergrain gaps and the formation of striped Zr_2Y_2 O_7. The typical lamellar structure transforms into more equiaxed grains in the middle and bottom layers of the ceramic coating along with significant infiltration of amorphous CMAS and anorthite formation in the bottom layer owing to the high contents of Ca and Al.

关键词： YSZ thermal barrier coating APS CMAS corrosion Anorthite

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Unveiling Activated Carbon Degradation in Supercapacitor Using Liquid Cell Transmission Electron Microscopy

SSRN

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SSRN 2024年

作者： Tan, Daniel Q. Chen, Junyan Rao, Xinqiang Zhang, Fuming Ein-Eli, Yair Department of Materials Science and Engineering Guangdong Technion-Israel Institute of Technology 241 Daxue Road Shantou515063 China Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa3200003 Israel The Nancy and Stephen Grand Technion Energy Program Technion-Israel Institute of Technology Haifa3200003 Israel Guangdong Provincial Key Laboratory of Materials and Technology for Energy Conversion Guangdong Technion-Israel Institute of Technology 241 Daxue Road Shantou515063 China

Electrode stability critically impacts energy storage device performance, and despite theoretical recognition, directly observing the evolving electrode-electrolyte interface during the charge-discharge cycle of a supercapacitor remains challenging. This work directly addresses the technical gap by employing a liquid cell-assisted in-situ transmission electron microscopy. This innovative approach realizes real-time observation of the dynamic response of the activated carbon electrode during an electrical cycling of the supercapacitor cells. Driving the cell potential above a certain threshold potential during cycling leads to gas evolution that initiates cascade of events, causing the active carbon to disintegrate. This is being manifested in electrode’s mass loss and a rapid capacity decline upon further cycling. Nano-layer oxide coating of the activated carbon electrode using an atomic layer deposition effectively suppresses electrode-electrolyte reactions, stabilizing the electrode and improving the electrochemical properties. The first in-situ transmission electron microscope liquid cell design using an activated carbon substrate represents a breakthrough in understanding supercapacitors degradation, offering a working strategy for electrode dynamics investigation of various energy storage devices. © 2024, The Authors. All rights reserved.

关键词： Atomic layer deposition

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Magneto-Mechano-Electric Composite Energy Harvesters for Wireless Energy Transmission in Bio-Implanted Devices

SSRN

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SSRN 2024年

作者： Liu, Changyi Ren, Zhuang Li, Minghe Ge, Wenwei Wu, Chen Zhou, Liming Zhao, Hongwei Tang, Lihua Ren, Luquan Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun130025 China School of Mechanical and Aerospace Engineering Jilin University Changchun130025 China Key Laboratory of Automobile Materials Ministry of Education School of Materials Science and Engineering Jilin University Jilin Changchun130022 China Key Laboratory of CNC Equipment Reliability Ministry of Education Jilin University Changchun130022 China Chongqing Research Institute Jilin University Chongqing401120 China Department of Mechanical and Mechatronics Engineering The University of Auckland Auckland1010 New Zealand

Implantable microdevices (IMDs) have the potential to accurately and quickly monitor the physiological indicators of bionts and directly stimulate organs to facilitate treatment, making them the most promising wearable devices. However, the lack of reliable power supply technology has emerged as the primary obstacle for practical applications. To address this challenge, our study proposes a wireless energy transfer technology based on the magneto-mechano-electric effect (MME). The piezoelectric-magnetostrictive composite energy harvester converts the AC excitation magnetic field into an electric charge and supplies it to the electronic device within the body, enabling a wireless power supply for the implanted device. This system offers a dual charging mode: fast charging under a magnetic field and continuous charging under mechanical vibration. We conducted experiments to investigate the influence of factors such as the direction of the magnetic field, piezoelectric material, and encapsulation mode on the energy conversion efficiency of the harvester. Based on the experimental results and multi-field coupling finite element analysis (FEA) design, an encapsulated MME composite energy harvester with an anchor structure was developed. The experimental results indicate that the developed MME energy harvester was stimulated by an AC magnetic field for 600 s in a simulated implanted environment, enabling it to charge the capacitor to a voltage exceeding 3.3 V. The generated energy was sufficient to power a low-power thermometer for intermittent measurements and data transfer. This study realizes both wireless energy transmission under external magnetic field excitation and the collection and storage of external vibration energy and is expected to be a promising solution for the sustainable powering of IMDs. © 2024, The Authors. All rights reserved.

关键词： Magnetos

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Nanoparticle-based drug delivery systems for cancer therapy

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Smart materials in Medicine 2020年 1卷 10-19页

作者： Dang, Yu Guan, Jianjun Department of Mechanical Engineering and Materials Science Washington University in St. Louis St. LouisMO63130 United States

Nanoparticle-based drug delivery system (DDS) is considered promising for cancer treatment. Compared with traditional DDS, the nanoparticle-based DDS shows improved efficacy by: 1) increasing half-life of vulnerable drugs and proteins, 2) improving the solubility of hydrophobic drugs, and 3) allowing controlled and targeted release of drugs in diseased site. This review mainly focuses on nanoparticle-based DDS fabricated from chitosan, silica, and poly (lactic-co-glycolic acid). Their fabrication methods and applications in cancer treatment are introduced. The current limitations and future perspectives of the nanoparticle-based DDS are discussed. © 2020 The Authors

关键词： Nanoparticles

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Embedding hidden information in additively manufactured metals via magnetic property grading for traceability

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Additive Manufacturing 2022年 60卷

作者： Salas, D. Ebeperi, D. Elverud, M. Arróyave, R. Malak, R.J. Karaman, I. Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States Department of Mechanical Engineering Texas A&M University College StationTX77843 United States

Use of counterfeit goods has a large negative impact on manufacturing industry. Recently, counterfeiting of additively manufactured parts is being facilitated by advances in 3D scanning methods, which enable users to retrieve high resolution models and improve reverse engineering approaches. The present study develops and validates a methodology for encoding part authentication information within additively manufactured hardware during part fabrication which is based on embedding a ferromagnetic physical tag within a non-magnetic product. To demonstrate the applicability of this technique, non-magnetic 316L stainless steel was fabricated via laser direct energy deposition with embedded ferromagnetic 430 or 17–4PH stainless steels regions for local control of the magnetic response. The magnetic flux normal to the surface was recorded using a custom built 3-axis magnetic sensor to obtain magnetic flux intensity maps, revealing the embedded magnetic regions. The distribution of the magnetic regions, also characterized using scanning electron microscopy evaluations, can be retrieved from this map revealing the features of the physical tag. Magnetic response of the composites is explained as a function of local composition changes and crystalline structure. The methodology introduced here can be used to embed several traceability tools such as magnetic barcodes and Quick Response (QR) codes away from the surface, which can be detected on demand, in 3-D printed parts. © 2022 Elsevier B.V.

关键词： Embeddings

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Mechanics of Gradient Nanostructured Metals

SSRN

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SSRN 2024年

作者： Zhang, Yin Cheng, Zhao Zhu, Ting Lu, Lei State Key Laboratory for Turbulence and Complex System Department of Mechanics and Engineering Science Peking University Beijing100871 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA30332 United States

The emergence of heterogeneous nanostructured materials (HNMs) offers exciting opportunities to achieve outstanding mechanical properties. Among these materials, gradient nanotwinned (GNT) Cu is a prominent class of HNMs, demonstrating superior strengths by gaining extra strengths compared to non-gradient counterparts. Its layered gradient structure serves as a simplified quasi-one-dimensional model system for understanding the extra strengthening effects of structural gradients and resulting plastic strain gradients. This paper provides a comprehensive summary of recent experimental and modeling studies on the mechanics of GNT Cu, covering advances in controlled material processing, back stress measurement, deformation field characterization, dislocation microstructure analysis, and strain gradient plasticity modeling. These studies reveal the spatiotemporal evolution of both plastic strain gradients and extra back stresses originating from structural gradients. Direct connections are established between the sample-level extra strength of GNT Cu and the synergistic strengthening effects induced by local nanotwin structures and their gradients. We emphasize the critical role of the representative volume element size in assessing the effects of plastic strain gradient and extra back stresses. Moreover, lower-order strain gradient plasticity models are validated extensively through experimental characterization of GNT Cu, paving the way for future investigation into the mechanics of other HNMs. Finally, we provide an outlook on research needs for understanding the mechanics of HNMs toward the attainment of exceptional mechanical properties. © 2024, The Authors. All rights reserved.

关键词： Plastic deformation

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Investigating effect of compatibilizer on polymer blend filament from post-used styrofoam and polyethylene for fused deposition modelling 16

Investigating effect of compatibilizer on polymer blend fila...

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16th International engineering and Computing Research Conference, EURECA 2021

作者： Chow, H.M. Koay, S.C. Choo, H.L. Chan, M.Y. Ong, T.K. School of Engineering Faculty of Innovation and Technology Taylor's University Lakeside Campus No. 1 Jalan Taylor's Selangor Subang Jaya47500 Malaysia Faculty of Engineering and Technology Tunku Abdul Rahman College University Kuala Lumpur53300 Malaysia Department of Mechanical and Materials Engineering Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul Rahman Jalan Sungai Long Bandar Sungai Long Selangor Kajang Cheras43300 Malaysia

This research produced the filament by blending the recycled polystyrene (rPS) from post-used Styrofoam and low-density polyethylene (LDPE). This study used polystyrene-grafted-maleic anhydride (PS-g-MA) as a compatibilizer to the rPS/LDPE blend. The formulated filaments were printed into specimens using a FDM printer. The visual inspection results showed that the printed specimens displayed better adhesion as the printing temperature and extrusion rate percentage increased. The addition of PS-g-MA also enhanced the adhesion of the printed layers. In terms of tensile properties, adoption of PS-g-MA also significantly improved the tensile strength and tensile modulus of the printed specimens. Furthermore, the addition of PS-g-MA increased the degree of crystallinity but it has shown no significant effect on the melting temperature. In addition, compatibilized rPS/LDPE blend samples possessed higher onset thermal degradation temperatures than the uncompatibilized rPS/LDPE blend sample, where higher onset thermal degradation temperature indicated that the material has better thermal stability. Overall, PS-g-MA was an effective compatibilizer to the immiscible rPS/LDPE blend filament where improvements of overall material properties and print quality can be observed, and especially with 5 wt% of PS-g-MA compatibilizer content, the tensile, thermal properties and print quality were improved the most. © Published under licence by IOP Publishing Ltd.

关键词： Polystyrenes

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Machine Learning for Analyzing Atomic Force Microscopy (AFM) Images Generated from Polymer Blends

arXiv

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arXiv 2024年

作者： Paruchuri, Aanish Wang, Yunfei Gu, Xiaodan Jayaraman, Arthi Master of Science in Data Science Program University of Delaware NewarkDE19713 United States School of Polymer Science and Engineering University of Southern Mississippi 118 College Drive #5050 HattiesburgMS39406 United States Department of Chemical and Biomolecular Engineering University of Delaware 150 Academy St NewarkDE19713 United States Department of Materials Science and Engineering University of Delaware NewarkDE19713 United States Data Science Institute University of Delaware NewarkDE19713 United States

In this paper we present a new machine learning (ML) workflow with unsupervised learning techniques to identify domains within atomic force microscopy (AFM) images obtained from polymer films. The goal of the workflow is to identify the spatial location of the two types of polymer domains with little to no manual intervention (Task 1) and calculate the domain size distributions which in turn can help qualify the phase separated state of the material as macrophase or microphase ordered/disordered domains (Task 2). We briefly review existing approaches used in other fields - computer vision and signal processing - that can be applicable for the above tasks that happen frequently in the field of polymer science and engineering. We then test these approaches from computer vision and signal processing on the AFM image dataset to identify the strengths and limitations of each of these approaches for our first task. For our first domain segmentation task, we found that the workflow using discrete Fourier transform (DFT) or discrete cosine transform (DCT) with variance statistics as the feature works the best. The popular ResNet50 deep learning approach from computer vision field exhibited relatively poorer performance in the domain segmentation task for our AFM images as compared to the DFT and DCT based workflows. For the second task, for each of 144 input AFM images, we then used an existing porespy python package to calculate the domain size distribution from the output of that image from DFT-based workflow. The information and open-source codes we share in this paper can serve as a guide for researchers in the polymer and soft materials fields who need ML modeling and workflows for automated analyses of AFM images from polymer samples that may have crystalline/amorphous domains, sharp/rough interfaces between domains, or micro or macro- phase separated domains. © 2024, CC BY.

关键词： Unsupervised learning

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Leveraging Optical Anisotropy of the Morpho Butterfly Wing for Quantitative, Stain-Free, and Contact-Free Assessment of Biological Tissue Microstructures

arXiv

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arXiv 2024年

作者： Kirya, Paula Mestre-Farrera, Aida Yang, Jing Poulikakos, Lisa V. Department of Mechanical and Aerospace Engineering Program of Materials Science and Engineering UC San Diego 9500 Gilman Drive La Jolla CA92093 United States Department of Pharmacology Moores Cancer Center UC San Diego 3855 Health Sciences Drive La Jolla CA92093 United States Department of Pediatrics UC San Diego 9500 Gilman Drive La Jolla CA92093 United States

Changes in the density and organization of fibrous biological tissues often accompany the progression of serious diseases ranging from fibrosis to neurodegenerative diseases, heart disease and cancer. However, challenges in cost, complexity, or precision faced by existing imaging methodologies pose barriers to elucidating the role of tissue microstructure in disease. Here, we leverage the intrinsic optical anisotropy of the Morpho butterfly wing and introduce Morpho-Enhanced Polarized Light Microscopy (MorE-PoL), a stain- and contact-free imaging platform which enhances and quantifies the birefringent material properties of fibrous biological tissues. We develop a mathematical model, based on Jones calculus, which quantifies fibrous tissue density and organization. As a representative example, we analyze collagen-dense and collagen-sparse human breast cancer tissue sections and leverage our technique to assess the microstructural properties of distinct regions of interest. We compare our results with conventional Hematoxylin and Eosin (H&E) staining procedures and second harmonic generation (SHG) microscopy for fibrillar collagen detection. Our findings demonstrate that our MorE-PoL technique provides a robust, quantitative, and accessible route toward analyzing biological tissue microstructures, with great potential for application to a broad range of biological materials. Copyright © 2024, The Authors. All rights reserved.

关键词： Collagen

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