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European Powder Metallurgy Congress and Exhibition, Euro PM 2007

作者： Gomes, U.U. Soares, S.R.S. Furukava, M. Oliveira, L.A. Souza, C.P. Federal University of Rio Grande do Norte - UFRN Materials Science and Engineering Pos-Graduate Program Campus Universitário 59072-970 Natal RN Brazil

ISBN: (纸本)9781899072293

The present study investigates the behavior of the sintering and micro-hardness of stainless steel samples reinforced with nanoparticles of tantalum carbide (TaC). The main aim was to identify the effect of the dispersion of carbides over the microstructure and the mechanical properties of the compacts. Samples of AISI 316L pure and with the addition of 3% wt TaC were cold compacted in a cylindrical steel die (Ø = 5.0 mm) at 700 MPa and sintered in a vacuum furnace. The heating rate and sintering temperature used were 20°C/min and 1290°C respectively during 60 minutes. The results show that the carbides distribution increases the sintering kinetics and micro-hardness of the samples. We have been able to produce sintered samples with a relative density between 91.0% and 93.0%. The highest micro-hardness values using a 10N load were 115 HV for the reinforced sample and 76 HV for the sample without reinforcement.

关键词： Sintering

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Exploring the Correlation Between Surface Roughness, Surface Energy, Nano-indentation, Electrical Properties, and Magnetic Characteristics of Annealed Co40Fe40Dy20 Thin Films Deposited on Si(100) Substrates

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Journal of Electronic materials 2024年第8期53卷 4498-4511页

作者： Liu, Wen-Jen Chang, Yung-Huang Hsu, Shuo-Ting Fern, Chi-Lon Chen, Yuan-Tsung Tsao, Shin-Ying Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

The impact of film thickness and annealing temperature on the structural, electrical, magnetic, and mechanical properties of cobalt–iron–dysprosium (Co40Fe40Dy20 ) thin films deposited on Si(100) substrates have been investigated. X-ray diffraction (XRD) analysis confirmed the film's crystalline microstructure, featuring dysprosium oxide, Dy2O3(440), and cobalt oxide, Co2O3(422) and Co2O3(511), crystallographic phases. Surface energy measurements indicated a noticeable reduction in surface energy following annealing treatments, which could be ascribed to the alleviation of residual stress and enhanced atomic arrangement, resulting in a more stable film structure with reduced surface energy. The film exhibited a decreasing trend in hardness with increasing thickness, and film resistivity was significantly responsive to alterations in thickness and annealing temperature. Notably, the Co40Fe40Dy20 film demonstrated exceptional characteristics, featuring a high saturation magnetization (Ms) of 675 emu/cm3 and a low coercivity (Hc) of 9.5 Oe. Further analysis of magnetic domains and hysteresis loops revealed that larger and brighter domains were associated with higher Hc. To sum up, the surface roughness of CoFeDy films under various annealing temperatures played a pivotal role in shaping their magnetic, electrical, adhesive, and optical characteristics. An improved low-frequency alternating current magnetic susceptibility (χac) value was achieved by minimizing the pinning effect on domain walls through surface smoothing. Moreover, smoother surfaces displayed heightened carrier conductivity, resulting in a decrease in electrical resistance. On the whole, Co40Fe40Dy20 films exhibited outstanding soft magnetic properties, encompassing high saturation magnetization, low coercivity, exceptional mechanical attributes, and decreased surface energy. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Magnetic susceptibility

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Impact of selective ablation of self-assembly monolayer by localized Joule heating on silicon nanoelectronic sensors

Impact of selective ablation of self-assembly monolayer by l...

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IEEE SENSORS

作者： H. H. Liu T. H. Lin J. -T. Sheu Department of Materials Science and Engineering Graduate Program for Nanotechnology Taiwan

ISBN: (纸本)9781457717666

Silicon nanodevice biosensors have been attracted a lot of attention due to its advantages of label-free, real-time and very high sensitive detection. This study employs self-assembly monolayer (SAM) of methoxy-poly(ethyleneglycol) silane (MPEG-sil) as passivation on Si nanodevices. Ablation of SAM by Joule heating (JH) was performed at n - region of a nanobelt device, where the linker molecules, biotin were modified subsequently. Detection of Alexa dye-labeled Streptavidin (SA) showed that the fluorescence intensity at n - region increased with each 50-μl SA injection and saturated after the 4 th injection. A difference of fluorescence intensity between SAM-ablated device and without passivation is 4.9 fold. Threshold voltage (V th ) shifted ca. 35 mV after the 4 th injection for SAM-ablated device and as-fabricated device exhibited only a 10-mV V th shift. The results indicated that SAM-ablated device possess potential in reduction of sensing time and in increase of sensitivity for low concentration detection.

关键词： Nanoscale devices Fluorescence Nanobioscience Silicon Heating Surface treatment Biosensors

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Surface morphology engineering of Cu for nanoscale strain control in graphene

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Surfaces and Interfaces 2025年 67卷

作者： Dong Jin Kim Cheolho Jeon Bo Hyeon Kim Jooyoung Yoon Seungryul Yoo Hwanuk Guim Yun Sung Woo Byung Hee Hong Joonhee Moon Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University AbsSeoul 08826 Republic of Korea Graphene Square Inc. Suwon 16229 Republic of Korea Research Center for Materials Analysis Korea Basic Science Institute Daejeon 34133 Republic of Korea Department of Materials Science and Engineering Dankook University Chungnam 3116 Republic of Korea Institute of Plasma Technology Korea Institute of Fusion Energy (KFE) Gunsan Jeollabuk-do 54004 South Korea Department of Chemistry Seoul National University Seoul 08826 Republic of Korea

The most promising method for synthesizing high-quality, large-scale graphene films involves chemical vapor deposition (CVD) of carbon-containing precursors onto Cu substrates. During graphene growth in a CVD system, the interaction between graphene and the Cu substrate leads to the formation of anisotropic Cu step bunches, driven by interfacial surface energy minimization and the release of compressive stress during thermal cooling. It is widely acknowledged that a smooth substrate is crucial for achieving high-quality graphene, as graphene strain and Cu surface roughening induce wrinkles when transferred onto a silicon wafer, which negatively impacts the quality. Here, we introduce a straightforward approach for controlling strain in graphene by engineering the Cu surface morphology through mechanical tension during the growth process. We achieve a uniform distribution of low compressive strain across the graphene layer by applying varying mechanical weights to the Cu foil. Using atomic force microscopy (AFM), scanning electron microscopy (SEM), and Raman spectroscopy, we demonstrate that mechanical tension significantly reduces Cu surface roughness, providing a smoother interface for graphene growth. This work provides insights into the relationship between Cu surface structure and graphene strain, contributing to the optimization of substrate preparation for graphene synthesis and other related surface engineering applications.

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Heterotelechelic poly(ethylene glycol) tethered chain surface on gold for high-performance surface plasmon sensing

Heterotelechelic poly(ethylene glycol) tethered chain surfac...

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Transactions - 7th World Biomaterials Congress

作者： Kato, M. Nagasaki, Y. Uchida, K. Takahashi, T. Kataoka, K. Preventure Program JST Department of Materials Science Tokyo University of Science 2641 Yamazaki Noda 278-8510 Japan Department of Materials Science Graduate School of Engineering University of Tokyo 7-3-1 Kongo Bunkyo-ku Tokyo 113-8656 Japan

ISBN: (纸本)1877040193

The specific sensing of antigen-antibody interaction was examined by using a PEGylated sensor. For the surface modification, acetal-PEG-SH was prepared and by using acetal-PEG-SH, PEG brush was constructed on the gold sensor chip surface. Modification of antibody was carried out by conjugation of SH group in Fab' to the maleimide group at the distal end of PEG chains on the surface. The result shows that the suitable modification of antibody on the PEG brush surface is very important to obtain high sensing character.

关键词： Polyethylene glycols

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Aberration-Corrected STEM Study of Magnetic Alloys

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Microscopy and Microanalysis 2012年第S2期18卷 394-395页

作者： Elhalawaty, S. Mardinly, A. John Carpenter, R.W. Materials Science and Engineering Graduate Program School for Engineering of Matter Transport and Energy Arizona State University 85287-6106 United States LeRoy Eyring Center for Solid State Science Arizona State University AZ 85287- 9506 United States

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

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Synthesis and characterization of few-layered carbon nanotubes decorated with magnetic nanoparticles envisaging potential technological applications

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Surfaces and Interfaces 2025年 66卷

作者： da Silva, Wellington Marcos da Silva, Mauro Francisco Pinheiro de Souza, Rodrigo Nunes Silva, Alysson Martins Almeida Rodrigues, Alisson Mendes Santos, Alexandre Silva da Silva, SebastiãoWilliam Mohallem, Nelcy Della Santina Coaquira, José Antonio Huamaní Graduate Program in Materials Science (PPGCIMA) Faculty UnB Planaltina (FUP) University of Brasília DF Brasilia 73.345-010 Brazil International Center of Physics Institute of Physics Campus Universitário Darcy Ribeiro University of Brasilia DF Brasilia 70.910-900 Brazil Mechanical Engineering Department Faculty of Technology Campus Universitário Darcy Ribeiro University of Brasilia DF Brasilia 70.910-900 Brazil Institute of Physics University of Brasilia Campus Universitário Darcy Ribeiro DF Brasilia 70.910-900 Brazil Department of Chemistry Institute of Exact Sciences Federal University of Minas Gerais Belo Horizonte-MG MG 31270-901 Brazil

In this work, high-quality few-layered carbon nanotubes (CNTs) were synthesized using a novel iron-oxide/sulfur-based catalyst via the chemical vapor deposition method (CVD). To enable external magnetic control for potential technological applications, CNTs incorporating magnetic nanoparticles were also produced. An efficient synthesis route, employing a microwave-assisted reaction, was used to generate and integrate the iron oxide nanoparticles and CNTs. The synthesized nanomaterials were thoroughly characterized using X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TGA/DTA), transmission electron microscopy (TEM) and magnetic measurements. The results indicate that the few-layered CNTs (sample CNT-Ox) exhibit a magnetic response, which is further modified upon the incorporation of magnetic nanoparticles (sample CNT-Ox-Mag), suggesting an effective interaction between the CNTs and the magnetic nanoparticles. However, after a reduction process (sample CNT-Ox-Mag-Red), the magnetization increases approximately 20-fold compared to the other two samples. This significant enhancement reflects the presence of a substantial amount (∼48 %) of metallic iron primarily located within the CNTs channel. Raman spectroscopy revealed characteristic bands at 261 and 263 cm⁻¹, confirming the presence of single and few-layered CNTs. TEM images further demonstrate that the nanoparticles are encapsulated within the CNTs. These findings indicate the successful formation of a hybrid CNTs/magnetic nanoparticles system, which serve as a multifunctional platform with promising potential for technological applications. © 2025 Elsevier B.V.

关键词： Carbon nanotubes Magnetic nanoparticles Magnetic properties Novel catalyst Synthesis

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Deterministic modeling of the corrosion of low-carbon steel by dissolved carbon dioxide and the effect of acetic acid. I-effect of carbon dioxide

Deterministic modeling of the corrosion of low-carbon steel ...

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作者： Rosas-Camacho, O. Urquidi-Macdonald, M. Macdonald, D.D. Intercollegiate Graduate Program in Materials Science and Engineering Penn State University University Park PA 16802 United States Department of Engineering Science and Mechanics Penn State University University Park PA 16802 United States Center for Electrochemical Science and Technology Department of Materials Science and Engineering Penn State University University Park PA 16802 United States

ISBN: (纸本)9781607681212

Carbon dioxide (CO2) corrosion of carbon steel in the presence of brine has been a recognized problem in oil production for many years and it is becoming more common with the extensive use of CO2-flooding as an oil recovery technique. The presence of acetic acid is systematic in oil fields, however, its role in corrosion has not been well-recognized and its exact mechanistic role is still debated. The present work was carried out, in the first instance, to focus on developing an understanding of CO 2-corrosion of low-carbon steel and, in the second instance to ascertain the corrosion mechanistic effect of acetic acid. This understanding is achieved by developing a deterministic model that explains and accounts for the experimental observations from Electrochemical Impedance Spectroscopy (EIS) data and by extracting values for physical und chemical parameters that describe the system. The impedance model, based on the Point Defect Model, provides a good account of the formation and growth of a bi-layer passive film that comprises an point-defective oxide (inner) layer adjacent to the metal surface and a precipitated (outer) layer of siderite, FeCO3, that forms on the top of the inner layer. We conclude that the barrier oxide layer exists on the steel surface at pH values ranging from 4 to 6. ©The Electrochemical Society.

关键词： Carbon dioxide

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Trace Determination of Cardiac Troponin I Using a Label-Free Fiber Optical Localized Surface Plasmon Resonance Biosensors

Trace Determination of Cardiac Troponin I Using a Label-Free...

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2024 Laser Applications to Chemical, Security and Environmental Analysis, LACSEA 2024 - Part of Optica Sensing Congress

作者： Chiang, Chang-Yue Chen, Chien-Hsing Wang, Chien-Tsung Wu, Chin-Wei Chiang, Hsing-Yu Graduate School of Engineering Science and Technology Interdisciplinary Program of Engineering National Yunlin University of Science and Technology Yunlin64002 Taiwan Department of Biomechatronics Engineering National Pingtung University of Science and Technology Pingtung91201 Taiwan Department of Chemical & Materials Engineering National Yunlin University of Science and Technology Yunlin64002 Taiwan

ISBN: (纸本)9781957171371

This work proposes a carboxyl-graphene-oxide-based fiber optic localized surface plasmon resonance biosensor which employed anti-Cardiac Troponin I (anti-cTnI) as the recognition element to detect the cTnI-protein in 10 min with a limit of detection (LOD) of 5.8 pM, which meets the acceptable LOD for clinical testing of 0.04 ng/mL. © Optica Publishing Group 2024, © 2024 The Author(s)

关键词： Surface plasmon resonance

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Correction: N-doped carbon nanoparticles on highly porous carbon nanofiber electrodes for sodium ion batteries

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RSC advances 2025年第8期15卷 6370页

作者： Meltem Yanilmaz Bülin Atıcı Jiadeng Zhu Ozan Toprakci Juran Kim Nano-Science and Nano-Engineering Program Graduate School of Science Engineering and Technology Istanbul Technical University Istanbul 34469 Turkey yanilmaz@itu.edu.tr. Textile Engineering Istanbul Technical University Istanbul 34469 Turkey. Smart Devices Brewer Science Inc. Springfield MO 65806 USA. Department of Polymer Materials Engineering Yalova University 77200 Yalova Turkey. Advanced Textile R&D Department Korea Institute of Industrial Technology (KITECH) Ansan 15588 Korea jkim0106@kitech.re.kr.

[This corrects the article DOI: 10.1039/D3RA00635B.].

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