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Signal Improvement on Fibre Optic Evanescent Wave Sensor Based Polymeric Sensitive Coating of Chitosan-Agarose Hydrogel 1

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5th International Conference on Advances in Manufacturing and materials engineering, ICAMME 2022

作者： Akashah, Muhammad Haziq Noor Makhsin, Siti Rabizah Rani, Rozina Abdul Saad, Nor Hayati Razak, Khairunisak Abdul Gardner, Peter Scully, Patricia J. School of Mechanical Engineering College of Engineering Universiti Teknologi MARA Selangor Shah Alam40450 Malaysia School of Materials and Mineral Resources Engineering Universiti Sains Malaysia Nibong Tebal14300 Malaysia School of Chemical Engineering and Analytical Science Manchester Institute of Biotechnology The University of Manchester ManchesterM1 7DN United Kingdom NCLA School of Physics National University of Ireland Galway Ireland

ISBN: (数字)9789811995095

ISBN: (纸本)9789811995088

This study aimed to explore the correlation between mechanical and structural properties of chitosan (CH) and agarose (AG) hydrogel as a sensitive coating for single-mode optical fibre (SMF) sensors. CH hydrogel was first made without crosslinking as a stock solution at 0.25% w/v concentration before introducing it to AG as the matrix in the fabrication of hybrid-hydrogel (HH). CH was introduced to AG solution in ratio of 1, 2, 5 and 10% w/v concentration to 2% w/v of AG. The highest thickness was shown by a sample of 2% w/v CH to AG hydrogel with an increment of 2.21% from the bare exposed SMF. From the absorption signal measurement, the correlation can be seen as the signal obtained increases directly proportional to the thickness coating. The sensor generated significant signal improvement when HH used a sensitive coating with a refractive index (RI) sensitivity of 3658 ± 0.23352 RIU−1 for glycerol detection. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Hydrogels

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Topological surface states as key catalytic elements for hydrogen-evolution reactions with the topological semimetal Cu3PdN

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Physical Review Applied 2024年第6期22卷 064090-064090页

作者： Minghang Li Yinuo Huo Lirong Wang Lei Jin Ying Liu Xuefang Dai Guodong Liu Xiaoming Zhang State Key Laboratory of Reliability and Intelligence of Electrical Equipment and School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China School of Mechanical Medical and Process Engineering Queensland University of Technology Gardens Point Campus Brisbane QLD 4001 Australia

Topological materials, distinguished by symmetrically protected topological surface states (TSSs), have emerged as highly promising catalysts for hydrogen evolution reactions (HERs). In light of the promising potential of topological materials in catalytic processes, there is an urgent need to delve into the underlying mechanisms. In this work, our focus centers on Cu3PdN, distinguished by its antiperovskite structure. Notably, this material exhibits a distinctive Weyl nodal chain featuring nodal loops in proximity to the Fermi level. We select Cu3PdN as a representative case study to explore and elucidate the intricate interplay between topological properties and catalytic performance. This work was carried out using first-principles calculations. The presence of topological nodal loops, characterized by drumhead surface states, significantly augments the surface density of states, resulting in an outstanding catalytic performance in the HER process. Remarkably, the catalytic efficiency demonstrated by this mechanism surpasses that of the benchmark catalyst Pt. Notably, we uncover a linear correlation between the presence of TSSs and catalytic efficiency. This revelation establishes TSSs as a superior metric for characterizing the performance of topological catalysts compared to conventional descriptors such as the d-band center. Our study not only broadens the landscape of topological catalysis but also provides a tangible exemplar for elucidating the inherent topological mechanisms at play in these catalysts. The identification of Cu3PdN as a potent HER catalyst, guided by TSS properties, represents a significant advancement, offering other avenues for the design and understanding of topological materials in catalytic applications.

关键词： Hydrogen evolution reaction

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Plasma spray-physical vapor deposition toward advanced thermal barrier coatings:a review

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Rare Metals 2020年第5期39卷 479-497页

作者： Mei-Jun Liu Gao Zhang Yan-Hong Lu Jia-Qi Han Guang-Rong Li Cheng-Xin Li Chang-Jiu Li Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi'an 710049China

Plasma spray–physical vapor deposition(PS–PVD)is a unique technology that enables highly tailorable functional films and coatings with various rare metal elements to be *** technology bridges the gap between conventional thermal spray and vapor deposition and provides a variety of coating microstructures composed of vapor,liquid,and solid deposition *** PS–PVD technique serves a broad range of applications in the fields of thermal barrier coatings(TBCs),environmental barrier coatings(EBCs),oxygen permeable films,and electrode *** also represents the development direction of high-performance TBC/EBC preparation *** the PS–PVD technique,the composition of the deposition unit determines the microstructure of the coating and its *** coating materials are injected into a nozzle and transported into the plasma jet,the deposition unit generated by a coating material is affected by the plasma jet ***,there is no direct in situ measurement method of material transfer and deposition processes in the PS–PVD plasma jet,because of the extreme conditions of PS–PVD such as a low operating pressure of*100 Pa,temperatures of thousands of degrees,and a thin and high-velocity *** the difficulties,the transport and transformation behaviors of the deposition units were also researched by optical emission spectroscopy,observation of the coating microstructure and other *** paper reviews the progress of PS–PVD technologies considering the preparation of advanced thermal barrier coatings from the perspective of the transport and transformation behaviors of the deposition *** development prospects of new high-performance TBCs using the PS–PVD technique are also discussed.

关键词： Plasma spray–physical vapor deposition (PSPVD) Deposition unit Cross-domain behavior Deposition mechanism Thermal barrier coatings (TBCs)

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Preparation and properties of Al-Fe3O4 casting functional powder of novel iron-based composite

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Ceramics International 2025年

作者： Yu, Wenzhen Gao, Yimin Zheng, Kaihong Wang, Yiran State Key Laboratory for Mechanical Behaviour of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an China Institute of New Materials Guangdong Academy of Sciences Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application Guangzhou China Guangdong Provincial Iron Matrix Composite Engineering Research Centre Guangzhou China

The cast-penetration process is a widely utilized technique for fabricating metal matrix composites. Al-Fe3O4 powder has emerged as a novel functional material for casting applications. This study focuses on investigating the reaction characteristics, underlying mechanisms, and the influence of process parameters on exothermic properties. Notably, the reaction products are significantly affected by varying atmospheric conditions. The Al-Fe3O4 casting functional powder undergoes six temperature nodes during the heating process from 20 °C to 1300 °C. By precisely controlling the powder parameters, the reaction temperature can be adjusted within a broad range (600 °C–900 °C), while the exothermic energy output can be regulated between 200 J/g and 1300 J/g. Al-Fe3O4 casting functional powder enables innovative casting applications through its exothermic reaction, which generates Fe and Al2O3 while releasing significant heat. This released heat effectively elevates the temperature at the ZTA and substrate interfaces, thereby promoting metallurgical bonding and forming an optimized flexible interface layer that significantly enhances the overall performance of the composite material. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Metallic matrix composites

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A Universal Strategy For N-Doped 2D Carbon Nanosheets With Sub-Nanometer Micropore For High-Performance Supercapacitor

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Energy & Environmental materials 2021年第4期4卷 569-576页

作者： Jiangqi Zhou Li Jiang Chengyong Shu Long Kong Iqbal Ahmad Ya-Nan Zhou Wei Tang Xiaofei Sun Yuping Wu State Key Laboratory for Mechanical Behavior of Materials School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi’an 710049China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy ScienceNanjing Tech UniversityNanjing 211800China

Preparing carbon nanosheets with precise control of open porous morphology via universal process and understanding the relationship between structure and capacitive performance are very urgent for achieving advanced ***,we propose a simple yet effective additive-free method to transform a bulk layered potassium phthalimide salt to novel nitrogen-doped twodimensional carbon sheets by self-activation during *** obtained samples showed large-sized and flat structure with lateral size around 10μm,uniform sub-nanometer micropore size distribution of about 0.65 nm dimension,large specific surface area up to 2276.7 m^(2)g^(-1),and suitable nitrogen *** from these merits,the optimized sample delivers a high specific capacitance of 345 F g^(-1)at 1 A g^(-1)and retains 270 F g^(-1)even at 50 A g^(-1)in6.0 M KOH ***,the symmetric supercapacitor shows maximum energy densities of 16.43 Wh kg^(-1)and 23.6 Wh kg^(-1)in 6.0 M KOH and 1.0 M Na_(2)SO_(4)electrolytes,***,on account the universality and simplicity of this method,the undoped as-prepared carbon sheet with uniform sub-nanometer micropore distribution can be synthesized from different potassium-containing salts with layered structure,which can be employed as a model for a deep understanding the effect of sub-nanometer micropores on capacitive *** find the number of micropores centered at 0.65 nm can be applied as one indicator to clarify the correlation between capacitance and critical pore size below 1 nm.

关键词： universal strategy sub-nanometer micropore carbon nanosheet supercapacitors

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Needle-induced-fracking in soft solids with crack blunting

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EXTREME MECHANICS LETTERS 2022年 52卷

作者： Song, Zhaoqiang Cai, Shengqiang Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla CA 92093 USA Materials Science and Engineering Program University of California San Diego La Jolla CA 92093 USA

Fracking, also known as hydraulic fracture, has been intensively studied in hard and brittle materials such as shale rocks and ice. In contrast, little is known about fracking in soft solids, especially with significant crack blunting. Recently, it has been found that during the needle-induced-cavitation experiments on soft gels or elastomers, the materials can be ruptured by pressurized fluid. Due to the large elastofracture length, a short crack in a soft solid during the fracking often shows severely blunted tips, and therefore, the crack extension and large deformation in the material become nearly indistinguishable in the experiments. In this letter, we propose to adopt a simple model, considering both large deformation and crack blunting, to predict the change of the hydraulic pressure during the needle-induced-fracking in soft solids. We found that the theoretical predictions agree very well with experimental data reported in the literature. The studies presented in this letter may provide new insights into the understanding of the fracking in soft tissues and cells, and lead to a facile way to measure fracture energy of soft materials, which can be very challenging for conventional testing methods. (C) 2022 Elsevier Ltd. All rights reserved.

关键词： Hydraulic fracture Soft solid Needle-induced fracking Fracture toughness Cavitation-to-fracture

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ρ-CP: OPEN SOURCE DISLOCATION DENSITY BASED CRYSTAL PLASTICITY FRAMEWORK FOR SIMULATING TEMPERATURE-AND STRAIN RATE-DEPENDENT DEFORMATION

arXiv

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arXiv 2023年

作者： Patra, Anirban Chaudhary, Suketa Pai, Namit Ramgopal, Tarakram Khandelwal, Sarthak Rao, Adwitiya McDowell, David L. Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay MH Mumbai400076 India School of Materials Science and Engineering GWW School of Mechanical Engineering Georgia Institute of Technology AtlantaGA30332 United States

This work presents an open source, dislocation density based crystal plasticity modeling framework, ρ-CP. A Kocks-type thermally activated flow is used for accounting for the temperature and strain rate effects on the crystallographic shearing rate. Slip system-level mobile and immobile dislocation densities, as well slip system-level backstress, are used as internal state variables for representing the substructure evolution during plastic deformation. A fully implicit numerical integration scheme is presented for the time integration of the finite deformation plasticity model. The framework is implemented and integrated with the open source finite element solver, Multiphysics Object-Oriented Simulation Environment (MOOSE). Example applications of the model are demonstrated for predicting the anisotropic mechanical response of single and polycrystalline hcp magnesium, strain rate effects and cyclic deformation of polycrystalline fcc OFHC copper, and temperature and strain rate effects on the deformation of polycrystalline bcc tantalum. Simulations of realistic Voronoi-tessellated microstructures as well as Electron Back Scatter Diffraction (EBSD) microstructures are demonstrated to highlight the model’s ability to predict large deformation and misorientation development during plastic *** Codes 74D10 © 2023, CC BY.

关键词： Multiphysics

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Effect of AU Thin Films Thickness on the Wetting Characteristics of Eutectic Pb-Sn Solder on Ni/Ag Solder Bath

SSRN

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SSRN 2023年

作者： Pal, Vishal Kwon, Do-Kyun Lee, Jung-Kun Department of Mechanical and Materials Science and Engineering University of Pittsburgh PittsburghPA15261 United States Department of Materials Science and Engineering Korea Aerospace University Gyeonggi-do Goyang10540 Korea Republic of

Wetting of Pb-Sn solder on Au/Ni surface is experimentally studied as a function of the thickness of Au coating on Ni buffer layer. While Au coating is known to increase the wettability of Pb-Sn solder on Ni surface, the effect of Au layer thickness was not examined systematically. This study shows that i) an increase in Au layer thickness from 0.15 to 0.3 µm decreases the surface coverage (spread) of the solder and ii) there is a compositional change in Pb-Sn solder on Au/Ni surface due to formation of a Sn rich region at the solder - Ni interface during a reflow process of the solder. The thickness of Sn rich region near the interface increases with increasing the Au layer thickness. A driving force for the formation of the Sn rich phase is explained using the negative mixing enthalpy of Au-Sn. Since an increase in the Sn content of Pb-Sn solder increases the surface energy and viscosity of the solder melt, an increase in the thickness of the Sn rich region at the solder-Ni interface suppressed the wetting of the solder. © 2023, The Authors. All rights reserved.

关键词： Viscosity

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Analysis of effective stresses for titanium alloys in continuous forming process

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materials Today: Proceedings 2022年 49卷 383-389页

作者： Mulualem Hailu Besha Devendra Kumar Sinha C. Venkatesh Satyam Shivam Gautam Manufacturing Engineering School of Mechanical and Industrial Engineering Dire Dawa University Dire Dawa 1362 Ethiopia Mechanical Design and Manufacturing Engineering School of Mechanical Chemical and Materials Engineering Adama Science and Technology University Adama 1888 Ethiopia Department of Mechanical Engineering North Eastern Regional Institute of Science and Technology Itanagar India

In this study, the investigation of effective stresses of Titanium Grade 5 feedstock material during the continuous forming process has been carried out. The numerical simulation has been carried out through a finite element tool DEFORM-3D. The experimental plan and design have been carried out by using Response Surface Methodology (RSM) on MINTAB platform by considering extrusion wheel velocity and feedstock temperature as main extrusion parameters. Effective-stresses of Ti-6Al-4 V alloy have been investigated to understand the deformation behavior for further more applicability of feedstock material in the modern industrial sector and to keep the shoe and other components of the CONFORM machine safe. It has been found that the effective-stress of feedstock material is high in the biting - deformation region and then gradually decreases towards the flowing direction of the material. It has been observed that as the feedstock temperature increases, the value of effective stresses which occur in other region decreases to some extent. So, the result concludes that increasing extrusion wheel velocity and feedstock temperature of alloy will reduce the shear strength of feedstock material during the continuous forming process. Therefore, the load requirement for deformation can be reduced. Moreover, the wear of extrusion shoe which is one of the most important elements can also be minimized thereby enhancing the life of extrusion shoe material.

关键词： Continuous extrusion Ti-4Al-6V alloy Feedstock temperature DEFORM-3D Extrusion wheel velocity

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Constructing Pd-N interactions in Pd/g-C_(3)N_(4)to improve the charge dynamics for efficient photocatalytic hydrogen evolution

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Nano Research 2022年第4期15卷 2928-2934页

作者： Xudong Xiao Siying Lin Liping Zhang Huiyuan Meng Jing Zhou Qi Li Jianan Liu Panzhe Qiao Baojiang Jiang Honggang Fu Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Safety Engineering Heilongjiang University of Science and TechnologyHarbin 150080China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Chinese Acad Sci Shanghai Synchrotron Radiat FacilShanghai Adv Res InstShanghai 201204China

The formation of chemical bonds between metal ions and their supports is an effective strategy to achieve good catalytic ***,both the synthesis of active metal species on a support and control of their coordination environment are still ***,we show the use of an organic compound to produce tubular carbon nitride(TCN)as a support for Pd nanoparticles(NPs),creating a composite material(NP-Pd-TCN).It was found that Pd ions preferentially bind with the electron-rich N atoms of TCN,leading to strong metal-support interactions that benefit charge transfer from g-C_(3)N_(4)to Pd.X-ray absorption spectroscopy further revealed that the metal-support interactions resulted in the formation of Pd-N bonds,which are responsible for the improvement in the charge dynamics as evidenced by the results from various techniques including photoluminescence(PL)spectroscopy,photocurrent measurements,and electrochemical impedance spectroscopy(EIS).Owing to the good dynamical properties,NP-Pd-TCN was used for photocatalytic hydrogen evolution under visible-light irradiation(λ>420 nm)and an excellent evolution rate of~381μmol·h^(-1)(0.02 g of the photocatalyst)was *** work aims to promote a strategy to synthesize efficient photocatalysts for hydrogen production by controllably introducing metal nanoparticles on a support and in the meantime forming chemical bonds to achieve intimate metal-support contact.

关键词： carbon nitride charge transfer dynamics photocatalysis hydrogen evolution reaction

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