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Investigation of anisotropic thermophysical properties of highly oriented carbon fiber composites: From one to three dimensions

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Carbon 2025年 243卷

作者： Yanhui Zhang Jie Yang Xiaoyu Zhang Rui Xu Minsu Liu Aoran Fan Yingjun Liu Jianli Wang Xing Zhang Jiangsu Key Laboratory for Design and Manufacturing of Precision Medicine Equipment Department of Mechanical Engineering Southeast University Nanjing 210096 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 China Monash Suzhou Research Institute Monash University Suzhou 215000 China ARC Research Hub for Smart Process Design and Control School of Chemical and Biological Engineering Monash University Clayton VIC 3800 Australia MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University 38 Zheda Road Hangzhou 310027 China

Highly oriented carbon fiber composites exhibit three-dimensional anisotropic thermophysical properties, making them candidates for thermal management applications. In this study, the thermal properties of highly oriented carbon fiber/epoxy resin (CF/ER) composites and their components were systematically investigated. The T-type probe method was employed to measure the pitch CF, while the 2ω method and the laser-spot-periodic-heating method were combined to characterize the E51-ER film and the composites. The impact of local fiber bending on heat transfer in the composites was also analyzed through finite element simulations. The results show that these composites exhibit high thermal conductivity along the fiber orientation with an anisotropy ratio of about 294. At different temperatures, the thermal conductivity along the fiber orientation is lower than the value predicted by the parallel model, while the conductivity in the other two directions is significantly higher than that predicted by the series model. Simulation results suggest that the bending of certain pitch CF can be a key factor contributing to this discrepancy.

关键词： Electron temperature

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Erratum: “Tensorial formulations for improved thixotropic viscoelastic modeling of human blood” [J. Rheol. 66, 327 (2022)]

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Journal of Rheology 2023年第3期67卷 789-789页

作者： Matthew Armstrong Andre Pincot Soham Jariwala Jeff Horner Norman Wagner Antony Beris Department of Chemical and Biomolecular Engineering Center for Research in Soft Matter and Polymers University of Delaware Newark Delaware 19716 Department of Chemistry and Life Science Chemical Engineering Program United States Military Academy West Point New York 10996 Thermal/Fluid Component Sciences Department Sandia National Laboratories Albuquerque New Mexico 87123

The authors wish to make the following correction to their article [1]: The original Fig. 12(c) contained an erroneous representation for curve N1. The followin

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Circularly polarised electroluminescence from chiral excitons in vacuum-sublimed supramolecular semiconductor thin films

arXiv

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arXiv 2024年

作者： Chowdhury, Rituparno Preuss, Marco D. Cho, Hwan-Hee Thompson, Joshua J.P. Sen, Samarpita Baikie, Tomi Ghosh, Pratyush Boeije, Yorrick Chua, Xian-Wei Chang, Kai-Wei Guo, Erjuan van der Tol, Joost van den Bersselaar, Bart W.L. Taddeucci, Andrea Daub, Nicolas Dekker, Daphne M. Keene, Scott T. Vantomme, Ghislaine Ehrler, Bruno Meskers, Stefan C.J. Rao, Akshay Monserrat, Bartomeu Meijer, E.W. Friend, Richard H. Cavendish Laboratory University of Cambridge J. J. Thomson Avenue CambridgeCB3 0HE United Kingdom Institute for Complex Molecular Systems Laboratory of Macromolecular and Organic Chemistry Eindhoven University of Technology P.O. Box 513 Eindhoven5600 MB Netherlands Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road CambridgeCB3 0FS United Kingdom The Gurdon Institute The Department of Genetics University of Cambridge CambridgeCB2 1QN United Kingdom Department of Chemical Engineering and Biotechnology University of Cambridge Philippa Fawcett Drive CambridgeCB3 0AS United Kingdom State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China B23 Beamline Diamond Light Source Ltd DidcotOX11 0DE United Kingdom Dipartimento di Chimica e Chimica Industriale University of Pisa Via Moruzzi 13 Pisa56124 Italy Center for Nanophotonics AMOLF Science Park 104 Amsterdam1098 XG Netherlands

Materials with chiral electronic structures are of great interest. We report a triazatruxene, TAT, molecular semiconductor with chiral alkyl side chains that crystallises from solution to form chirally-stacked columns with a helical pitch of 6 TATs (~2.3 nm). These crystals show strong circularly polarised, CP, green photoluminescence, with dissymmetry of 24%. Electronic structure calculations using the full crystal structure, show that this chiral stacking associates angular momentum to the valence and conduction states and thus gives rise to the observed CP luminescence. Free-standing crystals are not useful for active semiconductor devices, but we have discovered that co-sublimation of TAT as the ‘guest’ in a structurally mismatched ‘host’ enables the fabrication of thin films where the chiral crystallization is achieved in-situ by thermally-triggered nano-phase segregation of dopant and host whilst preserving the integrity of the film. This enables fabrication of bright (green) organic light-emitting diodes with unexpectedly high external quantum eQiciencies of up to 16% and electroluminescence dissymmetries ≥10%. These materials and this process method oQer significant application potential in spintronics, optical displays and multidimensional optoelectronics. © 2024, CC BY.

关键词： Electroluminescence

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Universal mechanical response of metallic glasses during strain-rate-dependent uniaxial compression

arXiv

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arXiv 2022年

作者： Jin, Weiwei Datye, Amit Schwarz, Udo D. Shattuck, Mark D. O'Hern, Corey S. Department of Mechanical Engineering and Materials Science Yale University New HavenCT06520 United States Department of Chemical and Environmental Engineering Yale University New HavenCT06520 United States Benjamin Levich Institute Physics Department The City College of New York New YorkNY10031 United States Department of Physics Yale University New HavenCT06520 United States Department of Applied Physics Yale University New HavenCT06520 United States Graduate Program in Computational Biology and Bioinformatics Yale University New HavenCT06520 United States

Experimental data on the compressive strength σmax versus strain rate Ε eng for metallic glasses undergoing uniaxial compression shows significantly different behavior for different alloys. For some metallic glasses, σmax decreases with increasing Ε eng, for others, σmax increases with increasing Ε eng, and for others σmax versus Ε eng is nonmonotonic. Using numerical simulations of metallic glasses undergoing uniaxial compression at nonzero strain rate and temperature, we show that they obey a universal relation for the compressive strength versus temperature, which determines their mechanical response. At low Ε eng, increasing strain rate leads to increases in temperature and decreases in σmax∗, whereas at high Ε eng, increasing strain rate leads to decreases in temperature and increases in σmax∗. This non-monotonic behavior of σmax∗ versus temperature causes the nonmonotonic behavior of σmax∗ versus Ε eng. Variations in the internal dissipation change the characteristic strain rate at which the nonmonotonic behavior occurs. These results are general for a wide range of metallic glasses with different atomic interactions, damping coefficients, and chemical compositions. © 2022, CC BY.

关键词： Strain rate

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Liquid-liquid transition in water from first principles

arXiv

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arXiv 2022年

作者： Gartner, Thomas E. Piaggi, Pablo M. Car, Roberto Panagiotopoulos, Athanassios Z. Debenedetti, Pablo G. Department of Chemistry Princeton University PrincetonNJ08544 United States Department of Physics Princeton University PrincetonNJ08544 United States Program in Applied and Computational Mathematics Princeton University PrincetonNJ08544 United States Princeton Institute for the Science and Technology of Materials Princeton University PrincetonNJ08544 United States Department of Chemical and Biological Engineering Princeton University PrincetonNJ08544 United States

A longstanding question in water research is the possibility that supercooled liquid water can undergo a liquid-liquid phase transition (LLT) into high- and low-density liquids. We used several complementary molecular simulation techniques to evaluate the possibility of an LLT in an ab initio neural network model of water trained on density functional theory calculations with the SCAN exchange correlation functional. We conclusively show the existence of a first-order LLT and an associated critical point in the SCAN description of water, representing the first definitive computational evidence for an LLT in water from first principles. Copyright © 2022, The Authors. All rights reserved.

关键词： Density functional theory

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Microstructure Of Au/Ti Ohmic Contacts On n-GaN

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Microscopy and Microanalysis 2020年第S2期4卷 668-669页

作者： R.-J. Liu L. L. Smith M. J. Kim R. W. Carpenter R. F. Davis Science and Engineering of Materials Program and Center of Solid State Science Arizona State University Tempe AZ85287-1704 Department of Chemical Engineering North Carolina State University Raleig NC27695-7905 Department of Materials Science and Engineering North Carolina State University Raleigh NC27695-7907

GaN is a semiconductor with a direct band-gap of 3.4 eV which has a potential application in optoelectronic devices such as UV-emitting lasers and blue light emitting diodes. Extensive efforts have been made to develop low-resistance, thermally stable and uniform ohmic contacts on GaN. In this study, n-GaN films (Si-doped) with an intermediate A1N buffer layer were grown on 6H-SiC substrates via MOVPE. The contacts were formed by depositing Ti and then Au films on GaN by e-beam evaporation at room temperature. Current-voltage measurements as a function of temperature showed that the ohmicity of the Au/Ti contact improved upon annealing, corresponding to changes in the microstructure of the contact interfaces involving a redistribution of nitrogen and ***. 1 shows the microstructure of the as-deposited Au/Ti/GaN films. The nanocrystalline Ti film was about 50 nm thick. Au film was polycrystalline, containing many growth twins. The thickness of Au film varied from 260 to 350 nm.

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Basic Framework of Regional Model for Disaster Waste Estimation and Distribution by Using Spatial Approach in Central Java-Indonesia 2

Basic Framework of Regional Model for Disaster Waste Estimat...

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2nd International Conference on Smart City Innovation

作者： Maryono, M. Seruningtyas, K. Roynaldi, A.D. Sudarno Hadiyanto Department of Urban and Regional Planning Faculty of Engineering Diponegoro University Indonesia Master Program of Environmental Science School of Postgraduate Diponegoro University Indonesia Department of Environmental Engineering Faculty of Engineering Diponegoro University Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Indonesia

Disaster are becoming more frequent around the world and more intense in urban areas. Central Java is the province with the largest number of disasters in Indonesia. Disaster create amount of disaster waste and sometime very huge, many times comparing to daily municipal waste generation. Government and local citizen sometimes are unable to handling disaster waste. Since effective implementation of disaster waste management (DWM) will lead quick and better recovery of living and avoid more environmental risk, high level regional government such as provincial should help. To make effective support, it is important that provincial government develop a model to monitor disaster waste generation in each regency and cities. This study aims to develop basic framework of regional model for disaster waste estimation and distribution in provincial level. This study used Central Java Province as a case study. To estimate disaster waste in Central Java, this study developed an index system as a basic model. It is about basic comparison of disaster waste generation in all central java regencies or cities. Disaster waste is associated with total disaster events. This study utilized GIS tools to express model and system. This study developed of regional model disaster waste estimation in Central Java, divided by 3 sub decades. Study result shown that in first decade 1990-1999 the highest index of disaster waste estimation is Brebes Regency. Second decade 2000-2009 the highest index of disaster waste estimation is Semarang Regency and the third decade 2010-2018 the highest index of disaster waste estimation in Cilacap Regency. © Published under licence by IOP Publishing Ltd.

关键词： Disasters

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Synthesize Palladium Nanoparticles from the Macroalgae Sargassum Fusiforme: An Eco-Friendly Tool in the Fight Against Plasmodium Falciparum?

SSRN

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SSRN 2022年

作者： Kamaraj, Chinnaperumal Ragavendran, Chinnasamy Kumar, R.C. Satish Sabarathinam, Sarvesh Vetrivel, Cittrarasu Vaithiyalingam, Mariyappan Malafaia, Guilherme Drug Testing Laboratory Directorate of Research SRM Institute Science and Technology Tamil Nadu Kattankulathur603 203 India Department of Cariology Saveetha Dental College and Hospitals Tamil Nadu Chennai India Carbon Capture Lab Department of Chemical Engineering SSN College of Engineering Kalavakkam Tamil Nadu Chennai603110 India Department of Chemistry SRM Institute of Science and Technology Kattankulathur Tamilnadu Chengalpattu603203 India Laboratory of Toxicology Applied to the Environment Goiano Federal Institute GO Urutaí Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute GO Urutaí Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia MG Uberlândia Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás GO Goiânia Brazil

Although numerous drugs are practiced to control malaria and its vectors, more recently, eco-friendly control tools have been proposed to battle its etiologic agents. Thus, using green bionanotechnology approaches, we aimed to synthesize palladium nanoparticles (Pd NPs) from the macroalgae Sargassum fusiforme (Sf), its potential antiparasitic activity against P. falciparum, as well as its possible cytotoxicity, in HeLa cells. After the biosynthesis of the PdSf NPs, their characterization was carried out by UV–Vis, FESEM, and EDX analyses, and their hydrodynamic size, zeta potential, and surface area were determined. Furthermore, the functional groups of the PdSf NPs were analyzed by FT-IR and GC–MS. While PdSf NPs had an IC50 of 7.68 µg/mL (Chloroquine (C)-s) and 16.42 µg/mL, S. fusiforme extract had an IC50 of 14.38 µg/mL (CQ-s) and 35.27 µg/mL (CQ- r). With an IC50 value of 94.49 µg/mL, PdSf NPs exhibited the least toxic effect on the HeLa cells. The Lipinski rule of five and ADMET prediction were used to assess the in-silico models of caffeine acid hexoside and quercetin 7-O-hexoside for the presence of drug-like properties. Pathogenic proteins, primarily responsible for motility, binding, and disease-causing, were the target of the structurally based docking studies between plant-derived compounds and pathogenic proteins. Thus, our study pioneered promising results that support the potential antiplasmodial activity of eco-friendly synthesized PdSf NPs using S. fusiforme extract against P. falciparum, opening perspectives for further exploration into the use of these NPs in malaria therapy. © 2022, The Authors. All rights reserved.

关键词： Nanoparticles

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Repositioned Drugs for COVID-19-the Impact on Multiple Organs

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SN comprehensive clinical medicine 2021年第7期3卷 1484-1501页

作者： Christina Chan Sean T Foster Kayla G Chan Matthew J Cacace Shay L Ladd Caleb T Sandum Paul T Wright Brett Volmert Weiyang Yang Aitor Aguirre Wen Li Neil T Wright Department of Chemical Engineering and Materials Sciences Michigan State University 428 S. Shaw Lane Room 2100 EB East Lansing MI 48824 USA. Department of Biochemistry and Molecular Biology Michigan State University East Lansing MI USA. Department of Biomedical Engineering Michigan State University East Lansing MI USA. Institute for Quantitative Health Science and Engineering Michigan State University East Lansing MI USA. Integrative Neuroscience Program Binghamton University Binghamton NY USA. Department of Mechanical Engineering The Pennsylvania State University University Park PA USA. Department of Mechanical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA. Department of Electrical and Computer Engineering Michigan State University East Lansing MI USA. Department of Mechanical Engineering Michigan State University East Lansing MI USA.

This review summarizes published findings of the beneficial and harmful effects on the heart, lungs, immune system, kidney, liver, and central nervous system of 47 drugs that have been proposed to treat COVID-19. Many of the repurposed drugs were chosen for their benefits to the pulmonary system, as well as immunosuppressive and anti-inflammatory effects. However, these drugs have mixed effects on the heart, liver, kidney, and central nervous system. Drug treatments are critical in the fight against COVID-19, along with vaccines and public health protocols. Drug treatments are particularly needed as variants of the SARS-Cov-2 virus emerge with some mutations that could diminish the efficacy of the vaccines. Patients with comorbidities are more likely to require hospitalization and greater interventions. The combination of treating severe COVID-19 symptoms in the presence of comorbidities underscores the importance of understanding the effects of potential COVID-19 treatments on other organs.

关键词： COVID-19 Central nervous system Drug repositioning Heart Immune system Kidneys Liver Lungs

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Thermally-induced phase transformations of CALF-20: insights into its phase stability and carbon capture properties

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Journal of Materials Chemistry A 2025年

作者： Kang, Dong A. Suphavilai, Navaporn Mohamed, Amro M. O. Economou, Ioannis G. Shetty, Manish Kim, Jinsoo Jeong, Hae-Kwon Artie McFerrin Department of Chemical Engineering Texas A&M University 3122 TAMU College StationTX77843 3122 United States Department of Materials Science and Engineering Texas A&M University 3122 TAMU College StationTX77843 3122 United States Chemical Engineering Program Texas A&M University at Qatar PO Box 23874 Doha Qatar Kyung Hee University 1732 Deogyeong-daero Gyeonggi-do Yongin17104 Korea Republic of

Calgary Framework 20 (CALF-20) has garnered a great deal of attention as a promising adsorbent for CO2 capture applications due to its high CO2 uptake capacity and excellent stability in humid environments. Multiple studies have explored its adsorption properties and separation performance, while a few studies reveal the existence of several phases of CALF-20, including α-, β-, and τ-phases. α-Phase (i.e., referred as CALF-20) is known to transform into β- or τ-phase under humid or thermal conditions, respectively. Computational studies have shown that β-CALF-20 exhibits a higher heat of CO2 adsorption, making it more suitable for CO2 capture compared to α-CALF-20. However, β-CALF-20, transformed from α-CALF-20 under humid conditions, is known to be less stable, thus observed only upon moisture exposure. Here, we demonstrate that β-CALF-20 can be formed solely by thermal treatment of α-CALF-20 and this thermally-derived β-CALF-20 is significantly more stable and can be readily obtained by drying as-synthesized CALF-20 at temperatures above 100 °C. Computational analyses corroborate the experimental results, affirming that the α-to-β phase transformation can be achieved solely through thermal treatment, without the involvement of water, via a modification in the Zn coordination number from 5 to 4. More importantly, this study finds that it is challenging to determine gas adsorption properties of α-CALF-20, as degassing of α-CALF-20 at elevated temperatures under vacuum almost always leads to its transformation into β-CALF-20. The resultant β-phase demonstrates a CO2 uptake of 2.38 mmol g−1 at 0.1 bar and 30 °C, along with a CO2/N2 IAST selectivity of 222 for a 10 : 90 CO2/N2 mixture, which aligns with previous reports. Consequently, these findings imply that previously reported gas adsorption properties, including carbon (CO2) capture capacities, may have been measured on the β-phase of CALF-20, rather than the α-phase. © 2025 The Royal Society of Chemistry.

关键词： Metastable phases

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