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Sustainable compression-molded bamboo fibers/poly(lactic acid)green composites with excellent UV shielding performance

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材料科学技术（英文版） 2025年第2期205卷 247-257页

作者： Binqi Fei Haiyan Yang Jing Yang Dawei Wang Hua Guo Hua Hou Saad Melhi Ben Bin Xu Hamdy Khamees Thabet Zhanhu Guo Zhengjun Shi Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China Ministry of EducationSouthwest Forestry UniversityKunming 650224China Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China Southwest Forestry UniversityKunming 650224China Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China Southwest Forestry UniversityKunming 650224China Shanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemistry College of ScienceUniversity of BishaBisha61922Saudi Arabia Department of Mechanical and Construction Engineering Northumbria UniversityNewcastle Upon TyneNE1 8STUK Department of Chemistry College of Sciences and ArtsNorthern Border UniversityRafha 91911Saudi Arabia

The increasing deployment of electronics in everyday life has generated great concerns regarding the ef-fective disposal of waste from these ***,we focused on a facile sustainable and economical strategy to provide ideas for this *** strategy relied on using appropriate mechanical treatment and sodium lignosulfonate coating to improve the dispersion and interfacial compatibility of bamboo fibers in poly(lactic acid).By optimising the particle size and concentration of sodium lignosulphonate,high value-added and green composites were prepared using sectional pressurization with a venting *** treated composite displayed an ultra-smooth surface(roughness of 0.592 nm),impressive transient properties(disintegration and degradation behaviour after 30 d),and outstanding ultraviolet(UV)shielding properties(100％).These properties hold the promise of being an excellent substrate for electronic devices,especially for high-precision processing,transient electronics,and UV damage *** satisfactory interfacial compatibility of the composites was confirmed by detailed characterisa-tion regarding the related physicochemical *** investigation offers a sustainable approach for producing high value-added green composites from biomass and biomass-derived materials.

关键词： Bamboo fibers Poly(lactic acid) Interfacial compatibility Sodium lignosulfonate

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Zero Thermal Expansion Metamaterial Designs for Space Structures

Zero Thermal Expansion Metamaterial Designs for Space Struct...

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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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Enhanced production of microbial levulinic acid through deletion of the levulinic acid transcriptional regulator (lvaR) in engineered Pseudomonas putida KT2440

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Bioprocess and Biosystems engineering 2025年 1-14页

作者： Kim, Hyun Jin Kim, Byung Chan Lim, Gaeun Han, Yebin Jeong, Yunhee Kim, Hee Taek Jeon, Woo-Young Ahn, Jungoh Bhatia, Shashi Kant Yang, Yung-Hun Advanced Materials Program Department of Biological Engineering College of Engineering Konkuk University Seoul 05029 South Korea Department of Food Science and Technology Chungnam National University Daejeon South Korea Biotechnology Process Engineering Center Korea Research Institute Bioscience Biotechnology (KRIBB) Chungbuk South Korea Institute for Ubiquitous Information Technology and Application Konkuk University Seoul South Korea

Levulinic acid (LA) is a platform compound regarded as a promising organic intermediate for the synthesis of various chemicals such as fuel additives, plasticizers, solvents, and pharmaceuticals. Traditionally, LA is produced via acid-catalyzed dehydration and hydrolysis of lignocellulosic biomass, but this process involves challenges such as high temperatures and pressures, the use of strong acids, byproducts formation, and limitations in recovery and purification. To provide an alternative for chemical synthesis, we previously designed an integrated process to produce LA from glucose using genetically engineered Pseudomonas putida KT2440. However, as the consumption of the produced LA could not be completely prevented, its overall yield was limited. Therefore, in this study we constructed P. putida strains with additional knock-out of the lva operon genes (lvaAB, lvaE, and lvaR) in a pcaIJ knock-out strain, and introduced the aroG, asbF, and adc genes to design an LA production pathway. The pcaIJ, lvaR double knock-out strain P. putida HP205 produced 20.42 mM of LA from glycerol, and culture condition including temperature, glucose concentration, and nitrogen source were optimized. Under optimal conditions, P. putida HP205 produced 73.9 mM (8.58 g/L) LA in fed-batch fermentation. When crude glycerol was used as the substrate, both LA production and cell growth were enhanced. This study presents the impact of the LA transcriptional regulator and demonstrates a strategy for enhanced LA production in P. putida. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： adc aroG asbF Levulinic acid lva operon lvaR

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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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Deciphering Self-Assembly Mechanisms of IRMOF-n-Inspired Three-Dimensional Cubic-Symmetry Nanoporous Crystals from Multiscale Simulations

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Chemistry of materials 2025年第10期37卷 3799-3812页

作者： Ardila, Katherine Liu, Tsung-Wei Gómez-Gualdrón, Diego A. Pak, Alexander J. Department of Chemical and Biological Engineering Colorado School of Mines 1601 Illinois Street Golden 80401 CO United States Materials Science Program Colorado School of Mines 1601 Illinois Street Golden 80401 CO United States Quantitative Biosciences and Engineering Program Colorado School of Mines 1601 Illinois Street Golden 80401 CO United States

The formation mechanisms of metal−organic frameworks (MOFs) are not fully understood. Therefore, experimental realization of potential “breakthrough” MOFs is hindered by uncertainty in the synthesis conditions that would allow the constituent nodes and linkers to self-assemble into the targeted MOF structure. Here, a multiscale endeavor using density functional theory (DFT) calculations, followed by metadynamics with DFT-informed classical atomistic potentials, followed by standard molecular dynamics (MD) and Hamiltonian replica exchange (HREX) simulations with a metadynamics-informed, coarse-grained (CG) model, was used to study the self-assembly mechanism of cubic-symmetry porous crystals inspired by the IRMOF-n family of MOFs. Mechanistic differences were examined for different values of node-linker coordination strength─understood as the free energy penalty for breaking a coordination bond in a solvated environment. Our integrated analyses of HREX-derived free energy surfaces and standard MD trajectories indicate that at coordination strengths typical of the IRMOF-n family in dimethylformamide (DMF) (i.e., 52 kJ/mol), disassembled nodes and linkers are favored to overcome a small 1.3 kJ/mol free energy barrier to first form solid amorphous clusters, which then overcome a series of barriers (the largest of which is 3.7 kJ/mol) to heal and form ordered, more stable, cubic-symmetry crystals. This healing seems to occur through the splintering/reattaching of small clusters from/to large clusters. Our analyses also suggest that if coordination strength is moderately weakened (e.g., to 40 kJ/mol), crystals form without the preliminary formation of amorphous clusters. However, further coordination strength weakening (e.g., to 36 kJ/mol) makes the formation of sizable crystals unfavorable thermodynamically. On the other hand, strengthening the coordination would increase the free energy barrier to heal the amorphous clusters into crystals. Accordingly, if coordination b

关键词： Hamiltonians

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Fluorescent Sodium Alginate Hydrogel-Carbon Dots Sensor for Detecting Perfluorooctanoic Acid in Potable Water

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Analytical Chemistry 2025年第18期97卷 10075-10084页

作者： Mohammadi, Somayeh Sandoval-Pauker, Christian Dorado, Zayra N. Senftle, Thomas P. Pankow, Robert Sharifan, Hamidreza Department of Chemistry and Biochemistry University of Texas at El Paso El PasoTX79968 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Metallurgical & Materials Engineering The University of Texas at El Paso 500 West University Avenue El PasoTX79902 United States Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Environmental Science and Engineering Program University of Texas at El Paso El PasoTX79968 United States

Per- and polyfluoroalkyl substances (PFASs), especially perfluorooctanoic acid (PFOA), are emerging environmental and health concerns due to their persistence, resistance to degradation, and bioaccumulation. In this study, we developed a sensitive and selective detection platform based on a sodium alginate (SA) hydrogel modified with nitrogen and fluorinated carbon dots (N,F-CDs) to enhance the detection of PFOA in natural and engineered water systems. The SA hydrogel-N,F-CD composite exhibited strong fluorescence at 480 nm after optimization, achieving a detection limit as low as 0.001 ppt. The sensor was characterized by using Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FT-IR), Powder X-ray Diffraction (PXRD), X-ray Photoelectron Spectroscopy (XPS), and zeta potential spectroscopy, revealing its structural integrity, functional groups, and the surface charge of the SA hydrogel-N,F-CDs network. Sensitivity assessments demonstrated a linear fluorescence response to PFOA concentrations ranging from 1 to 66 ppq. Selectivity tests confirmed the sensor’s ability to distinguish PFOA from other perfluorinated compounds, with minimal interference from other substances. The practical applicability of the sensor was validated using spiked recovery experiments with tap water samples from various locations, achieving recovery rates between 94% and 106.6%. This sensor offers a reliable, efficient, and highly sensitive platform for the detection of PFAS, demonstrating its potential for real-world PFAS-monitoring applications. © 2025 American Chemical Society.

关键词： Fourier transform infrared spectroscopy

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