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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Lu, Wei-Chun Oudghiri-Idrissi, Othman Poli, Andrea Arruda, Ellen M. Tol, Serife Department of Mechanical Engineering University of Michigan 2350 Hayward St Ann ArborMI48109 United States Fariborz Maseeh Department of Civil Architectural and Environmental Engineering The University of Texas at Austin 301 E. Dean Keeton St AustinTX78712 United States Department of Mechanical Engineering Macromolecular Science and Engineering Program University of Michigan 2350 Hayward St Ann ArborMI48109 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

The precision of space structures is sensitive to high-temperature variation during on-orbit operations. This work develops zero thermal expansion (ZTE) metamaterials that can be integrated into space structures to restrict large thermal deformation under precision requirements. The proposed bi-material ZTE metamaterial beams show extremely low coefficients of thermal expansion (CTE) for a wide temperature variation. Static and dynamic analyses are conducted on the designed metamaterials for performance evaluation. The proposed ZTE beam elements are integrated into a 48-meter rib of a space RF antenna to enhance its thermal precision over a wide temperature range. Further, experimental validation of the ZTE truss beam design is conducted in a thermal chamber to demonstrate its low thermal deformation compared to a reference aluminum truss beam. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Trusses

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Synthesis of nickel-backboned polymers by incorporating triazine groups

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science Bulletin 2025年

作者： Zhang, Yifeng Zeng, Kaiwen Wu, Yanruzhen Huang, Fuyao Peng, Huisheng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Institute of Fiber Materials and Devices and Laboratory of Advanced Materials Fudan University Shanghai200438 China

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Cyclic thermal treatment parameters of bagasse particle reinforced epoxy bio-composites for sustainable applications

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Discover Polymers 2025年第1期2卷 1-22页

作者： Oladele, Isiaka Oluwole Falana, Samuel Olumide Ilesanmi Akinbamiyorin, Michael Onuh, Linus Nnabuike Taiwo, Anuoluwapo Samuel Adelani, Samson Oluwagbenga Olajesu, Olanrewaju Favor Department of Metallurgical and Materials Engineering Federal University of Technology Akure Nigeria Department of Materials Science and Engineering Iowa State University Ames USA Faculty of Materials and Chemical Engineering University of Miskolc Miskolc Hungary Department of School of Aerospace Transport and Manufacturing School of Aerospace Transport and Manufacturing Cranfield University Cranfield UK Materials Science and Engineering Program University of Colorado Boulder USA

The demand for sustainable, high-performance materials has led to increased interest in bio-based composites. However, optimizing the mechanical properties of such materials for engineering applications remains a challenge. This study addresses this gap by developing and characterizing an epoxy-based biocomposite reinforced with sugarcane bagasse particles, focusing on the influence of cyclic thermal treatment on its properties. The bagasse particles were chemically treated with 1 M NaOH to remove impurities, improve interfacial bonding with the epoxy matrix, and enhance the overall composite performance. The treated particles j were pulverized to 470 µm and incorporated into the epoxy matrix (0–20 wt%) using the hand layup method. The composites were divided into untreated and thermally treated groups, with the latter subjected to cyclic thermal treatment (100 °C for 3 h over 7 days). Mechanical, wear, and water absorption properties were evaluated, while fractured surface morphologies were analyzed using SEM. Results revealed that cyclic thermal treatment significantly enhanced the composites’ performance, with the 15 wt% heat-treated composite showing optimal properties: density of 1.102 g/cm3, flexural strength of 29.13 MPa, ultimate tensile strength of 103.50 MPa, impact strength of 3.49 kJ/m2, hardness of 64.70 HS, and wear indices of 0.034 mg. These findings demonstrate that alkali treatment and cyclic thermal treatment synergistically enhance the performance of bio-composites, making them suitable for diverse applications, including automotive, aerospace, and other engineering fields.

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Ultrastable supported oxygen evolution electrocatalyst formed by ripening-induced embedding

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science (New York, N.Y.) 2025年第6735期387卷 791-796页

作者： Shi, Wenjuan Shen, Tonghao Xing, Chengkun Sun, Kai Yan, Qisheng Niu, Wenzhe Yang, Xiao Li, Jingjing Wei, Chenyang Wang, Ruijie Fu, Shuqing Yang, Yong Xue, Liangyao Chen, Junfeng Cui, Shiwen Hu, Xiaoyue Xie, Ke Xu, Xin Duan, Sai Xu, Yifei Zhang, Bo State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai China Collaborative Innovation Center of Chemistry for Energy Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials MOE Key Laboratory of Computational Physical Sciences Department of Chemistry Fudan University Shanghai China Department of Chemistry and Department of Electrical and Computer Engineering Northwestern University Evanston IL United States Hefei National Laboratory Hefei China

The future deployment of terawatt-scale proton exchange membrane water electrolyzer (PEMWE) technology necessitates development of an efficient oxygen evolution catalyst with low cost and long lifetime. Currently, the stability of the most active iridium (Ir) catalysts is impaired by dissolution, redeposition, detachment, and agglomeration of Ir species. Here we present a ripening-induced embedding strategy that securely embeds the Ir catalyst in a cerium oxide support. Cryogenic electron tomography and all-atom kinetic Monte Carlo simulations reveal that synchronizing the growth rate of the support with the nucleation rate of Ir, regulated by sonication, is pivotal for successful synthesis. A PEMWE using this catalyst achieves a cell voltage of 1.72 volts at a current density of 3 amperes per square centimeter with an Ir loading of just 0.3 milligrams per square centimeter and a voltage degradation rate of 1.33 microvolts per hour, as demonstrated by a 6000-hour accelerated aging test.

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Porous Poly(vinylidene fluoride-co-hexafluoropropylene)/copper oxide nanocomposite membranes for piezoelectric strain sensing

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Discover Applied sciences 2025年第5期7卷 1-17页

作者： Al-Ejji, Maryam Promi, Tamanna Sangor, Farah Al-Awa, Zinab Bonthula, Sumalatha Radhika, V. Ponnamma, Deepalekshmi Center for Advanced Materials Qatar University P O Box 2713 Doha Qatar Department of Biological and Environmental Sciences Qatar University P O Box 2713 Doha Qatar Department of Chemical Engineering University of Calicut Kerala Thenhipallam India Materials Science and Technology Program Department of Mathematics Statistics and Physics College of Arts and Sciences Qatar University Doha2713 Qatar

The emerging field of porous piezoelectric strain sensors attracted a wide range of applications in healthcare monitoring, wearable electronics, and other dynamic applications due to their durability, high sensitivity, and real-time monitoring. This study presents the development of porous poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/copper oxide (CuO) nanocomposite membranes for piezoelectric strain sensing. The morphology and the dispersion of CuO nanoparticles and nanofibers in PVDF piezoelectric films with different nano-CuO contents are studied by X-ray diffraction, Fourier transform infrared spectrum, scanning electron microscopy and dielectric studies. The PVDF-HFP acts as a scaffold, allowing ions to flow within the porous percolated channels, resulting in a highly robust membrane with desired dielectric properties. The DMA studies enhanced the strain sensing performance of the 3.5 and 7 wt.% CuO nanofibers loaded with PVDF-HFP membranes compared with the 3.5 and 7 wt.% CuO nanoparticles and pristine membranes. The dielectric properties of the composites also showed high storage values for the CuO/PVDF-HFP samples compared to the pristine polymer. Moreover, the surface water contact angles of the membranes have slightly increased after loading the nanomaterial into the PVDF-HFP matrix, which strongly influenced the surface energies, indicating hydrophobicity. The current study, thus, demonstrates the piezoelectric strain sensing devices made from PVDF-HFP/CuO nanofibers for humid atmospheres. © The Author(s) 2025.

关键词： Fourier transform infrared spectroscopy

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Advances in vat photopolymerization: early-career researchers shine light on a path forward

RSC Applied Polymers

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RSC Applied Polymers 2025年第3期3卷 574-591页

作者： Dhand, Abhishek P. Bean, Ren H. Chiaradia, Viviane Commisso, Alex J. Dranseike, Dalia Fowler, Hayden E. Fraser, Julia M. Howard, Holden Kaneko, Takashi Kim, Ji-Won Kronenfeld, Jason M. Mason, Keldy S. Pashley-Johnson, Fred Porcincula, Dominique H. Segal, Maddison I. Yu, Siwei Saccone, Max A. Department of Bioengineering University of Pennsylvania Philadelphia PA United States Sandia National Laboratories Albuquerque NM United States Department of Chemistry RCSI University of Medicine and Health Sciences Dublin Ireland Macromolecular Engineering Laboratory Department of Mechanical and Process Engineering ETH Zurich Zurich Switzerland Department of Chemistry University of Wisconsin-Madison Madison WI United States Materials Engineering Division Lawrence Livermore National Laboratory United States Department of Chemistry and Biochemistry University of California Santa Barbara CA United States Department of Chemical Engineering Kyungpook National University Daegu South Korea Department of Chemistry Stanford University Stanford CA United States Department of Chemistry The University of Texas at Austin Austin TX United States School of Chemistry and Physics Centre for Materials Science Queensland University of Technology (QUT) Brisbane QLD Australia Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Faculty of Sciences Ghent University Ghent Belgium Thomas Lord Department of Mechanical Engineering & Material Science Duke University Durham NC United States Department of Chemistry University of Washington Seattle WA United States Department of Chemical Engineering Stanford University Stanford CA United States Paul M. Rady Department of Mechanical Engineering University of Colorado Boulder Boulder CO United States

Vat photopolymerization (VP) has emerged as a promising additive manufacturing technique to allow rapid light-based fabrication of 3D objects from a liquid resin. Research in the field of vat photopolymerization spans across multiple disciplines from engineering and materials science to applied chemistry and physics. This perspective brings together early-career researchers from various disciplines in academia and national laboratories around the world to summarize the most recent advancements with special emphasis on the research highlighted as part of the Gordon Research Conference (GRC) 2024 meeting on Additive Manufacturing of Soft materials. We provide an outlook on next-generation polymer processing methods from synthesis of novel materials to multimodality manufacturing and performance engineering. Further, this article combines the ideas of many of these junior researchers to present a vision for the future of the field by highlighting the challenges and opportunities that lie ahead. © 2025 RSC.

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Graphene-functionalized textile composites for wearable Joule heating applications

Advanced Nanocomposites

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Advanced Nanocomposites 2025年 2卷 108-123页

作者： Omar Faruk Abbas Ahmed Ashfaqul Hoque Khadem Lu Jia Luyi Sun Department of Materials Science and Engineering Binghamton University State University of New York at Binghamton NY 13902 USA Polymer Program Institute of Materials Science and Department of Chemical & Biomolecular Engineering University of Connecticut Storrs CT 06269 USA Department Mechanical Engineering College of Engineering Computing and Applied Science Clemson University Clemson SC 29634 USA College of Textile Engineering Taiyuan University of Technology Jinzhong Shanxi 030600 China

Thermal comfort is essential for maintaining physiological well-being, with textile materials traditionally serving as the primary medium for regulating heat exchange between the body and its environment. However, conventional textiles often fall short of maintaining optimal thermal balance. So, there is an increasing demand for advanced thermoregulation systems that can effectively reduce heat loss and enhance warmth, ensuring consistent comfort. Recent research has highlighted the promise of advanced functional materials, especially graphene and its composites, for modifying textiles to improve thermal properties. This article comprehensively reviews recent advancements in graphene-functionalized textile composites, focusing on their applications in wearable Joule heaters designed for personalized thermal comfort or thermal therapy. Various graphene-functionalized textile composites are reviewed from the perspectives of material properties, processing strategies and device fabrication methods. Key challenges and future opportunities are summarized for graphene-functionalized textile-based Joule heaters as innovative solutions in wearable thermal regulation.

关键词： Graphene Textile Composite Wearable electronics Joule heater

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Renewable energy application of pulsed laser annealing perovskite quantum dots materials

Renewable energy application of pulsed laser annealing perov...

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Nanoscale and Quantum materials: From Synthesis and Laser Processing to Applications 2025

作者： Lin, Yen-Ting Hsieh, Jui-Ting Tsai, Meng-Lin Yang, Chan-Shan Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Micro/Nano Device Inspection and Research Center National Taiwan Normal University Taiwan Applied High Entropy Technology Center National Cheng Kung University Tainan Taiwan

ISBN: (纸本)9781510684522

With the advancement of the global economy and technology, energy demand has become an urgent issue, prompting heightened attention to environmental friendliness and sustainable development. Solar energy, as a significant renewable resource, has garnered widespread attention despite facing challenges in conversion efficiency. Perovskite materials, due to their cubic crystal structure exhibiting excellent optoelectronic properties and a broad spectrum response, along with low manufacturing costs, have emerged as a recent research focus. These materials have shown remarkable potential in solar cells, light-emitting devices, and photodetectors, offering high efficiency, tunable bandgaps, and scalable fabrication processes. This study enhances the optical performance and stability of perovskite quantum dots through femtosecond pulse laser annealing technology, thereby improving their quantum yield. Advanced optical systems are employed for analysis, fully leveraging the advantages of perovskite materials in photovoltaic conversion. This research not only provides foundational solutions to pressing energy challenges but also promotes the transition of society towards cleaner and more sustainable energy technologies. Moreover, it contributes to the advancement of more efficient solar technologies, promoting innovation and development in future energy sources, and effectively reducing dependence on non-renewable energy. This is of significant importance for environmental protection, ensuring a better living environment for the future generations. © 2025 SPIE.

关键词： Nanocrystals

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A Polymer System with Ultra-High Molecular Potential Energy

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Advanced Functional materials 2025年

作者： Wang, Yan-Jie Ni, Jia-Yu Gao, Fan Cui, Chunyan Xu, Ziyang Zheng, Si Yu Sun, Hanshu He, Yang Zhao, Yiping Wu, Zi Liang Liu, Wenguang Chen, Li State Key Laboratory of Separation Membranes and Membrane Processes School of Materials Science and Engineering Tiangong University Tianjin300387 China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin300350 China College of Materials Science and Engineering Zhejiang University of Technology Hangzhou310014 China Cangzhou Institute of Tiangong University Cangzhou061000 China Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou310027 China

In contrast to small molecules, macromolecules exhibit distinctive characteristics due to their higher potential energy (EP). These include elevated viscosity, enhanced tensile strength, cohesiveness, and stability. The EP of macromolecules can be modulated through the design of side groups, but this approach may also alter chemical properties. This study introduces an α-methylation strategy that significantly enhances EP without modifying the structure of these side groups. This increase in EP induces a transition in the rheological behavior of polymer systems from a rubbery to a glassy state. Concurrently, it improves hygrothermal tolerance without changing dynamic bond groups. The application of this ultra-high EP strategy results in substantial enhancements in traditional acrylic adhesives: a 1500% increase in adhesion strength and a 33200% rise in adhesion modulus when exposed to hot water. Polymer is endowed with a shape memory function due to ultra-high EP. With the dual interface locking of this function, the adhesion strength can be increased by 70%. This ultra-high EP strategy provides a possible explanation for the origin of vitrification in polymeric systems. © 2025 Wiley-VCH GmbH.

关键词： Macromolecules

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A novel photovoltaic/thermal (PVT) system using nano-enhanced micro-encapsulated PCM slurry for steam production: A numerical study

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International Journal of Thermofluids 2025年 27卷

作者： Azmeer, Ahmed Sheikh, Yahya Kanjo, Hasan A. Sabouni, Hamzeh Physical Science and Engineering Department King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates Department of Sustainable and Renewable Energy Engineering University of Sharjah Sharjah United Arab Emirates Materials Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates

As industries reliant on steam-based processes strive to reduce fossil fuel consumption and carbon emissions, interest in renewable technologies, particularly photovoltaic/thermal (PVT) systems that generate both thermal and electrical energy, is increasing. However, the limited thermal performance of PVT systems remains a key barrier. Traditional working fluids, such as water, nanofluids, and phase change material (PCM) slurries, exhibit low thermal conductivity, poor temperature regulation, and inefficient heat storage. To address these issues, a novel working fluid incorporating graphene oxide (GO) nanoparticles into microencapsulated PCM (MPCM) slurry is proposed. The integration of GO nanoparticles not only enhances the dispersion stability of the MPCM slurry but also significantly increases its thermal conductivity, leading to improved heat dissipation from PV cells. A comprehensive CFD investigation is conducted using ANSYS Fluent 2021, employing an Eulerian–Eulerian multiphase model to simulate the three-phase flow. In this model, water serves as the primary phase, while GO nanoparticles and MPCM function as secondary dispersed phases. The results demonstrate that increasing the GO volume fraction from 0 to 0.005 reduces average PV cell temperatures by up to 5°C at 40°C. Additionally, the nano-enhanced MPCM slurry achieves a thermal efficiency of 88.1 % and an electrical efficiency of 10.3 %. It is also found that using MPCM slurry as the working fluid, a 15 % volume fraction of MPCM with a melting point of 40°C achieves the highest thermal efficiency of 90.1 %, outperforming water by 20.1 % and surpassing previous studies on MPCM slurry and nanofluids. © 2025 The Author(s)

关键词： Nanofluidics

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