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Lithography-based additive manufacturing of steel metamaterials: effect of sintering temperature on shape distortion, microstructure and mechanical properties

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Procedia CIRP 2025年 132卷 80-85页

作者： Ruslan Melentiev Ahmed Wagih Gilles Lubineau Carlos A. Grande Advanced Membranes & Porous Materials (AMPM) Center. King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia KAUST Catalysis Center (KCC). King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Mechanical Engineering Program Physical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Saudi Arabia Mechanics of Composites for Energy and Mobility Lab King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Chemical Engineering Program. Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology

Lithography metal manufacturing (LMM) is an emerging sinter-based additive manufacturing (AM) technology for support-free 3D printing of extremely complex parts with micrometric resolution on a decimeter scale. Although the printing phase of LMM is well-established, the sintering stage is challenging due to either high porosity or melting-induced deformation, particularly in thin-walled lattices and metamaterials. This study investigates the effects of sintering temperature on shape distortion, surface morphology, chemistry, porosity, microstructure, and mechanical properties of 316L stainless steel auxetic metamaterials 3D printed using LMM and sintered in a furnace customized for precise temperature control. Our results show that the fully dense grain microstructure with high plasticity can be sintering within 1300 – 1325 °C range. Going beyond this temperature results in shape distortion and embrittlement of the steel metamaterials. The previously recommended range of sintering temperatures for 316L steel, 1360 - 1380 °C need revision.

关键词： Additive manufacturing (AM) Debinding Sintering Metal Metamaterials Mechanical properties

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Sensitivity improvement of Au-nanoparticle-based colorimetric probes via surface decoration of carbon quantum dots

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New Journal of Chemistry 2024年第22期48卷 10053-10059页

作者： Li, Yi-Ting Lo, Chien Feng Lin, Kuan-Han Liao, Pin-Chao Juan, Joon Ching Hsiao, Po-Hsuan Chen, Chia-Yun Department of Materials Science and Engineering National Cheng-Kung University Tainan 70101 Taiwan Program on Semiconductor Packaging and Testing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan 70101 Taiwan Nanotechnology & Catalysis Research Centre Institute for Advanced Studies University of Malaya Kuala Lumpur 50603 Malaysia Hierarchical Green-Energy Materials (Hi-GEM) Research Center National Cheng Kung University No. 1 University Road Tainan 70101 Taiwan

Visually colorimetric sensing of hazardous metallic ions based on gold nanoparticles (AuNPs) has been considered a facile, on-site, and reliable monitoring route, yet the improvement of detection limit, as well as environmental pH tolerance, is still needed. Herein, we present an integrated probe design based on functionalizing AuNP cores with carbon quantum dots (CQD) as colorimetric probes for tracing Cu²⁺ ions with a limit of detection as low as 18.7 nM. Improved detection selectivity was elucidated with the reduction in thiol groups bound between CQD decorations and AuNP probes initiated by oxidation of Cu²⁺ ion analytes, thus separating crossly connected probes, depending on tracing Cu²⁺ concentrations. Moreover, distributed CQDs with negative potentials allowed the stabilization of dispersed AuNPs against re-aggregation, which caused the gradual morphological transition from aggregated features to dispersed states in microscopic view, and eventually, reflected the gradual color change from red to purple-red. The correlated practicality of colorimetric detection of the Cu²⁺ ion was further validated with sound-sensing selectivity, environmental pH resistance and tests on real samples. © 2024 The Royal Society of Chemistry

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Development and Evaluation of a PANI/PMMA Composite Gas Sensor for Acetone Detection in Breath

Development and Evaluation of a PANI/PMMA Composite Gas Sens...

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STEM Education Conference (iSTEM-Ed), International

作者： Natnaree Phukkaphan Chayanin Khunarak Teerakiat Kerdcharoen Faculty of Science Materials Science and Engineering Program and Center of Nanoscience and Nanotechnology Mahidol University Bangkok Thailand Department of Physics Faculty of Science Mahidol University and NANOTEC Center of Excellence at Mahidol University Bangkok Thailand

ISBN: (数字)9798350365979

ISBN: (纸本)9798350365986

In recent years, the development of sensors capable of detecting acetone levels has garnered attention in health monitoring and personalized medicine. Acetone in the body, a ketone body produced during metabolic processes, has emerged as a promising biomarker for various health conditions, including diabetes, obesity, and metabolic disorders. Its presence in exhaled breath offers a non-invasive means of assessing metabolic health, presenting a unique opportunity for continuous monitoring and early intervention. This research investigated the use of a PANI/PMMA polymer sensor array to measure acetone gas. Breath samples and standard substances (acetone, butyric acid) were collected using a hygienic mask and measured with an electronic nose device. The tests showed the sensor could classify between a blank mask, acetone, butyric acid, and breath odors.

关键词： Obesity Precision medicine Education Electronic noses Sensors Polymers Monitoring

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MAGNETIC PROPERTIES EVALUATION OF POLYAMIDE 4.6 BONDED MAGNETIC COMPOSITE

MAGNETIC PROPERTIES EVALUATION OF POLYAMIDE 4.6 BONDED MAGNE...

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SAMPE 2024 Conference and Exhibition

作者： Karkhanis, Pratik Arigbabowo, Oluwasola K. Gonzalez, Aaron J. Inamdar, Shreyas Ahmed, Tanvir Herrera, Andres Geerts, Wilhelmus J. Tate, Jitendra S. Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States Department of Physics Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551455

Bonded magnetic composites combine the cost-effectiveness, low density, and manufacturing flexibility of conventional polymer binders with the unique magnetic characteristics of magnetic powders/fillers to form multifunctional magneto polymeric composites that offer superior properties to conventional sintered magnets. In this study, a co-rotating twin screw extruder was used to fabricate 20 and 40 wt.% strontium ferrite/polyamide 4.6 bonded magnetic composites viable for fused filament fabrication 3D printing. The characterization conducted on the bonded magnetic composites was scanning electron microscopy, simultaneous differential thermogravimetry, and vibrating sample magnetometry. The microstructure of the bonded composite exhibited a uniform platelet morphology of the strontium ferrite magnetic particles. There was no observable depreciation in the melting transitions, which suggests a thermally resistant magnetic composite. An appreciable increment in % crystallinity of 13 and 20% for 20wt.% and 40wt.% strontium ferrites bonded magnets were observed. This is attributable to the heterogeneous nucleation phenomenon, where the metal powders act as nucleation sites for increased crystalline domains. The bonded composite exhibited significant magnetic anisotropy, with the remanence (Mr), which is the most important property for magnetic application significantly increasing to 49.8% along the easy direction in comparison to the hard axis. This suggests the viability of the fabricated bonded composites in viable in producing anisotropic bonded magnetic devices, which are considered to exhibit stronger magnetic properties. © 2024 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Magnetic anisotropy

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Dynamics of self-hybridized exciton–polaritons in 2D halide perovskites

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Light(science & Applications) 2024年第1期13卷 13-22页

作者： Surendra B.Anantharaman Jason Lynch Christopher E.Stevens Christopher Munley Chentao Li Jin Hou Hao Zhang Andrew Torma Thomas Darlington Francis Coen Kevin Li Arka Majumdar PJames Schuck Aditya Mohite Hayk Harutyunyan Joshua R.Hendrickson Deep Jariwala Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA19104USA KBR Inc. BeavercreekOH45431USA Air Force Research Laboratory Sensors DirectorateWright-Patterson Air Force BaseOH45433USA Department of Physics University of WashingtonSeattleWA98195USA Department of Physics Emory UniversityAtlantaGA30322USA Department of Chemical and Biomolecular Engineering Rice UniversityHoustonTX77005USA Department of Materials Science and Nanoengineering Rice UniversityHoustonTX77005USA Applied Physics Program Smalley‐Curl InstituteRice UniversityHoustonTX77005USA Department of Mechanical Engineering Columbia UniversityNew YorkNY10027USA Department of Electrical and Computer Engineering University of WashingtonSeattleWA98195USA

Excitons,bound electron–hole pairs,in two-dimensional hybrid organic inorganic perovskites(2D HOIPs)are capable of forming hybrid light-matter states known as exciton-polaritons(E–Ps)when the excitonic medium is confined in an optical *** the case of 2D HOIPs,they can self-hybridize into E–Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the ***,the fundamental properties of these self-hybridized E–Ps in 2D HOIPs,including their role in ultrafast energy and/or charge transfer at interfaces,remain ***,we demonstrate that>0.5µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E–P *** E–Ps have high Q factors(>100)and modulate the optical dispersion for the crystal to enhance sub-gap absorption and *** varying excitation energy and ultrafast measurements,we also confirm energy transfer from higher energy E–Ps to lower energy E–***,we also demonstrate that E–Ps are capable of charge transport and transfer at *** findings provide new insights into charge and energy transfer in E–Ps opening new opportunities towards their manipulation for polaritonic devices.

关键词： charge polar excitation

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EFFECT OF BALL MILLING ON THE MAGNETIC PERFORMANCE OF STRONTIUM FERRITE (SrFe12O19) POWDERS

EFFECT OF BALL MILLING ON THE MAGNETIC PERFORMANCE OF STRONT...

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SAMPE 2024 Conference and Exhibition

作者： Arigbabowo, Oluwasola K. Hassan, Mehadi Asadollahnejad, Azin Islam, Md Shafikul Price, Holt Geerts, Wilhelmus J. Tate, Jitendra Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Department of Physics Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551455

The primary advantage of the high energy ball milling (HEBM) process is its ability to synthesize a homogeneous mixture with submicron (up to nanoscale) particle size. This approach is a viable process for particle size reduction and grain refinement of magnetic powders, which affects their domain structure and by extension the resulting magnetic properties. In this research, we designed a 9-ball milling experiment by keeping the rotational speed constant at 300rpm and varying the ball-to-powder ratio of 5:1, 8:1, and 10:1 for 6hrs, 10hrs, and 14hrs milling times. The strontium ferrite magnetic powders subjected to HEBM were analyzed for crystallite size and behavior via XRD, particle size reduction via SEM/ImageJ software/originLabPro, and magnetic performance via powder-based VSM measurement. The magnetic performance of the ball-milled strontium ferrite powders shows a good combination of appreciable increment in the S-values (a ratio of the remanence to saturation magnetization) and a considerable decline in coercivity ( © 2024 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Grain refinement

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Prediction of Weather Patterns Using Linear Angstrom Model

Prediction of Weather Patterns Using Linear Angstrom Model

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2022 Advances in science and engineering Technology International Conferences, ASET 2022

作者： Aljaghoub, Haya Alashkar, Adnan Alami, Abdul Hai Tawalbeh, Muhammad University of Sharjah Department of Industrail Engineering and Engineering Management Sharjah United Arab Emirates American University of Sharjah Materials Science and Engineering PhD Program Sharjah United Arab Emirates University of Sharjah Department of Sustainable and Renewable Energy Engineering Sharjah United Arab Emirates

ISBN: (纸本)9781665418010

The paper investigates the correlation between solar irradiance and sunlit hours for the city of Sharjah, United Arab Emirates. This correlation is a strong function of the weather conditions, and is vital for the design and operation of solar energy systems. The Angstrom Model is a straightforward tool that establishes a linear relationship where the model parameters b and a (slope and y-intercept, respectively) are evaluated through plotting of experimental measurements. Wind speed and relative humidity are collected to interpret their effect on the quality of incident solar radiation. The model takes into consideration winter and summer months of the year 2021, hence it provides a complete weather pattern for the year. With continuous data logging, the model will be developed to predict the weather patterns of the city of Sharjah. © 2022 IEEE.

关键词： Solar energy

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Evolution of hierarchical petal-like 3D SnS2 as high-performance electrode materials for supercapacitor applications

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materials Today: Proceedings 2022年 67卷 1039-1042页

作者： Kumar, Niraj Bhusan Sahoo, Bibhuti Chandra Sahu, Krushna Kumar Sahoo, Naresh Naik, Brundabana Soam, Ankur Kumar, Rahul Tripathi, Abhishek Kumar Sahoo, Prasanta Maharashtra Pune 411025 India Department of Mechanical Engineering Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India Department of Chemistry Environmental Science and Technology Program Siksha ‘O’ Anusandhan Deemed to be University Odisha Bhubaneswar 751030 India Department of Energy Science and Engineering IIT Delhi New Delhi 110016 India Department of Metallurgical and Materials Engineering Malaviya National Institute of Technology Jaipur Jaipur 302017 India

A simple one-step solvothermal approach has been adopted for the synthesis of SnS2. SEM shows hierarchically SnS2 with petal-like 3-dimensional layer structures because of this process. In this investigation, the as-prepared electrode material have an excellent specific capacitance of 721F g−1 at 1 mVs−1, indicating extraordinary performance. The improved electrochemical performance is because to unique ultrathin petal discrete structure, which provides increased electrolyte/electrode interface, high active sites, rapid ion/electron transfer, and short diffusion distances. A manufactured symmetric solid-state supercapacitor (SSC) device also has a large capacity to operate commercial LEDs, which allows for the assessment of its practical applicability in device-level application. According to the findings of this work, suitably layered 3D SnS2 electrode materials could be a promising route for the development of environmentally friendly energy storage applications. © 2022

关键词： Supercapacitor

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Mussel-Inspired and Bioclickable Peptide Engineered Surface to Combat Thrombosis and Infection

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Research 2022年第3期2022卷 91-104页

作者： Xiaohui Mou Hongbo Zhang Hua Qiu Wentai Zhang Ying Wang Kaiqin Xiong Nan Huang Hélder A.Santos Zhilu Yang Affiliated Dongguan Hospital Southern Medical UniversityDongguanGuangdong 523059China Guangdong Provincial Key Laboratory of Shock and Microcirculation GuangzhouGuangdong 510080China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Pharmaceutical Sciences Laboratory Åbo Akademi UniversityTurku Biosciences CenterUniversity of Turku andÅbo Akademi University20520 TurkuFinland State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai 200438China Department of Biomedical Engineering and W.J.Kolff Institute for Biomedical Engineering and Materials Science University Medical Center Groningen/University of GroningenAnt.Deusinglaan 19713 AV GroningenNetherlands Drug Research Program Division of Pharmaceutical Chemistry and TechnologyFaculty of PharmacyUniversity of HelsinkiFI-00014 HelsinkiFinland

Thrombosis and infections are the two major complications associated with extracorporeal circuits and indwelling medical devices,leading to significant mortality in *** address this issue,here,we report a biomimetic surface engineering strategy by the integration of mussel-inspired adhesive peptide,with bio-orthogonal click chemistry,to tailor the surface functionalities of tubing and *** by mussel adhesive foot protein,a bioclickable peptide mimic(DOPA)4-azidebased structure is designed and grafted on an aminated tubing robustly based on catechol-amine ***,the dibenzylcyclooctyne(DBCO)modified nitric oxide generating species of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid(DOTA)chelated copper ions and the DBCO-modified antimicrobial peptide(DBCO-AMP)are clicked onto the grafted surfaces via bio-orthogonal *** combination of the robustly grafted AMP and Cu-DOTA endows the modified tubing with durable antimicrobial properties and ability in long-term catalytically generating NO from endogenous snitrosothiols to resist adhesion/activation of platelets,thus preventing the formation of ***,this biomimetic surface engineering technology provides a promising solution for multicomponent surface functionalization and the surface bioengineering of biomedical devices with enhanced clinical performance.

关键词： DOTA generating Engine

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Third-Order Optical Properties of Ag Nanocubes and Ag-Au Hollow Nanostructures Investigated by Femtosecond Z-Scan Measurements

SSRN

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SSRN 2024年

作者： Sousa, Claudevan A. Melo, Antonio F.A.A. Silva, Nefe J.B. Silva, Tânia Patrícia Silva E. Viana, Bartolomeu C. Santos, Francisco Eroni P. Garcia, Hans Department of Physics UFPI - Universidade Federal do Piauí PI Teresina64049-550 Brazil Materials Engineering Graduate Program Federal Institute of Education Science and Technology of Piauí Central Campus PI Teresina64000-040 Brazil Interdisciplinary Laboratory for Advanced Materials BioMatLab group Materials Science & Engineering Graduate Program UFPI - Universidade Federal do Piauí PI Teresina64049-550 Brazil

In this work, we reported experimental investigations on third-order optical properties of aqueous colloidal dispersions of silver nanocubes (Ag-NCs) and Ag-Au hollow nanostructures. The hollow bimetallic are nanoboxes, that were synthesized by galvanic substitution using silver nanocubes as templates, inserting silver with gold in molar ratios of 1.5 and 3.0 mL. This process adjusted tuning the Surface Plasmon Resonance (SPR) compared to the original Ag-NCs nanocubes. Femtosecond Z-scan measurements performed at 1040 nm, 350fs and laser intensities from 99.7 - 279 GW/cm2 shows negative nonlinear refraction for both nanocube and nanoboxes colloids, attributed to hot electron generation. Solvent effects are simultaneously suppressed of the nanostructures. On the other hand, the non-linear absorption observed for bimetallic nanoboxes shows the presence of saturated absorption (SA), but the Ag-NCs do not show a non-linear absorption signal. Therefore, our experimental results provide a reliable reference for the application of these bimetallic nanostructures as active media in nonlinear photonic devices. © 2024, The Authors. All rights reserved.

关键词： Surface plasmon resonance

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