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Flexible refractory castables based on the Al2O3-MgO-TiO2 system

Ceramics International 2025年第15期51卷 20822-20829页

作者： Reitmann, B. Borges, O.H. Falsetti, L.O.Z. pagliosa Neto, C. pandolfelli, V.C. Federal University of São Carlos Graduate Program in Materials Science and Engineering São Carlos Brazil São Carlos Brazil RHI Magnesita Research and Development Center Contagem Brazil

Toughening by in-situ phase formation is highly desired for high-performance refractories, as it enhances their thermomechanical properties (e.g. thermal shock damage resistance). For this purpose, pseudobrookite and intermediary spinels are promising phases due to their thermal expansion mismatch, resulting in self-microcracking. Aiming to develop highly flexible refractory castables, compositions based on the Al2O3-MgO-TiO2 system were formulated with the aid of computational thermodynamics. Of the most promising compositions, five of them were experimentally produced and had their thermomechanical and physical properties assessed by X-ray diffraction, in-situ elastic modulus, thermal shock damage analysis (ΔT = 1000 °C) and scanning electron microscopy. Results pointed out that small titania contents led to a positive effect on microstructure densification, improving the mechanical performance of the refractories and generation of phases that induce microcracking upon cooling, enhancing the thermal shock damage resistance. Nevertheless, an excess of TiO2 led to extensive cracking and cohesion loss in the refractory matrix. © 2025

关键词： Microcracking

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Anomalous properties of spark plasma sintered boron nitride solids

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materials Today 2025年 86卷 42-51页

作者： Biswas, Abhijit serles, peter Alvarez, Gustavo A. schimpf, Jesse Hache, Michel Kong, Jonathan Demingos, pedro Guerra Yuan, Bo pieshkov, Tymofii s. Li, Chenxi puthirath, Anand B. Gao, Bin Gray, Tia Zhang, Xiang Murukeshan, Jishnu Vajtai, Robert Dai, pengcheng singh, Chandra Veer Howe, Jane Zou, Yu Martin, Lane W. Clancy, James patrick Tian, Zhiting Filleter, Tobin Ajayan, pulickel M. Department of Materials Science and Nanoengineering Rice University HoustonTX77005 United States Department of Mechanical & Industrial Engineering University of Toronto 5 King's College Road TorontoM5S 3G8 Canada Sibley School of Mechanical and Aerospace Engineering Cornell University IthacaNY14853 United States Department of Materials Science and Engineering University of California Berkeley94720 United States Department of Materials Science and Engineering University of Toronto 184 College St TorontoM5S 3E4 Canada Department of Physics and Astronomy McMaster University HamiltonL8S 4M1 Canada Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley94720 United States

Hexagonal boron nitride (h-BN) is a brittle ceramic with a layered structure, however, recent experiments have suggested that inter-layer structural engineering could be key to new structural and functional properties. Here we report the scalable bulk synthesis of high-density crystalline h-BN solids, by using high-temperature spark plasma sintering (sps) of h-BN powders, which show high values of mechanical strength, ductility, dielectric constant, thermal conductivity, and exceptional neutron radiation shielding capability. Through exhaustive characterizations we reveal that sps induces non-basal plane crystallinity, twisting of layers, and facilitates inter-grain fusion with a high degree of in-plane alignment across macroscale dimensions, resulting in near-theoretical density and improved properties. Our findings highlight the importance of material design, via new approaches such as layer twisting and interlayer interconnections, to create novel ceramics with properties that could go beyond their intrinsic limits. © 2025

关键词： Ductility

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Enhanced performance of monocrystalline silicon solar cells using sol-gel synthesized zinc stannate anti-reflective coating via electro-spraying technique

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Ceramics International 2025年第8期51卷 10899-10912页

作者： Mostafa, Ayman M. Velu Kaliyannan, Gobinath Gunasekaran, Raja El-Tayeb, Zaynb Rao, subha Krishna Al-Ahmadi, Ameenah N. Darwish, A.A.A. Younes, Ayman A.O. Elsharkawy, Wafaa B. palaniappan, sathish Kumar Department of Physics College of Science Qassim University P.O. Box 6644 Almolaydah Buraydah51452 Saudi Arabia Department of Mechatronics Engineering Kongu Engineering College Perundurai Tamil Nadu Erode638060 India Department of Mechanical Engineering Velalar College of Engineering and Technology Tamil Nadu Erode638012 India Department of Physics Faculty of Science Taibah University Yanbu46423 Saudi Arabia Centre for Nanoscience and Nanotechnology International Research Centre Sathyabama Institute of Science and Technology Tamil Nadu Chennai600119 India Department of Physics College of Sciences Umm Al-Qura University Makkah24382 Saudi Arabia Advanced Materials Research Laboratory Department of Physics Faculty of Science University of Tabuk Tabuk71491 Saudi Arabia Department of Chemistry College of Science University of Bisha Bisha 61922 Saudi Arabia Pysics Department College of Science and Humanities Prince Sattam Bin Abdulaziz University Alkharj11942 Saudi Arabia Natural Composites Research Group Lab Department of Materials and Production Engineering The Sirindhorn International Thai-German Graduate School of Engineering King Mongkut's University of Technology North Bangkok Bangsue Bangkok10800 Thailand

The current situation necessitates advancements in renewable energy to serve as a viable alternative to traditional energy sources. The photovoltaic cells can entirely change the need for fossil fuels since they can transform light energy into electrical energy. The reflection loss in photovoltaic cells is a contributing factor to reduced power conversion efficiency that could be mitigated by using antireflective coatings on the surface of the solar cells. This study examines the deposition of zinc stannate (ZnsnO3) as an efficient antireflective material to improve light capturing capability and it is synthesized by sol-gel method. The electro spraying method was employed to deposit the ZnsnO3 layers on photovoltaic cells. The ZnsnO3 AR material was uniformly distributed on the solar substrate at 2 ml/h for 1 h (Z1), 2 h (Z2), 3 h (Z3) and 4 h (Z4) respectively. The impact of ZnsnO3 ARC on the structural, electrical, absorbance, reflectance characteristics and temperature variation in monocrystalline silicon (m-si) solar cells was examined. The optical properties were determined by UV–visible spectroscopy technique. At a wavelength (300–800 nm), the ZnsnO3 coated for 3 h (Z3 specimen) exhibited highest absorbance of 92.65 % and the lowest electrical resistivity of 3.69 × 10−3 Ω-cm. When compared with bare and various ZnsnO3 coated cells, Z3 specimen showed a significant impact on solar cell efficiency. In direct solar radiation and stimulated light, the Z3 specimen achieved the maximum power conversion efficiency (pCE) of 21.16 % and 25.11 %. The findings indicated that ZnsnO3 could be a suitable AR coating material for reducing incoming photon reflection. © 2025 Elsevier Ltd and Techna Group s.r.l.

关键词： Antireflection coatings

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sodium niobate with high photocatalytic activity for the removal of organic dye and inactivation of Escherichia coli, staphylococcus aureus, and Klebsiella pneumoniae bacteria: the effect of Zn doping on these properties

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Ceramics International 2025年

作者： Fernandes, Daiane Raubach, Cristiane Trassante, Carla Dias, Vagner Melo, Luize silveira, Marcelle Carvalho, Ramon Moreira, Mario Jardim, pedro Ferrer, Mateus Giongo, Janice Vaucher, Rodrigo Longo, Elson Cava, sergio Post-Graduate Program in Materials Science and Engineering Federal University of Pelotas RS Pelotas96010-610 Brazil Post-Graduate Program in Microbiology and Parasitology Federal University of Pelotas RS Capão do Leão96160-000 Brazil Post-Graduate Program in Physics Federal University of Pelotas RS Capão do Leão96160-000 Brazil Functional Materials Development Center São Carlos Federal University SP São Carlos13565-905 Brazil

NaNbO3 doped with Zn (0.00, 0.02, and 0.05 mmol) was synthesized by the microwave-assisted hydrothermal method. photocatalytic and antibacterial activities were investigated. X-ray diffraction revealed the coexistence of two orthorhombic symmetries (p21ma and pbma), with doping promoting a progressive increase in the pbma fraction. All samples exhibited a fiber-like shape (diameter of ∼200 nm), which remained unchanged with doping. The low Zn content (0.02 mmol) reduced the band gap energy from 3.08 to 2.95 eV. As a result, this sample exhibited superior photocatalytic activity, achieving 100 % RhB dye degradation within 45 min, under UV light. scavenger tests revealed that hydroxyl radicals, holes, and superoxide radical anions were the main active species involved in the photocatalytic reaction. Additionally, the photocatalyst demonstrated excellent recyclability over three consecutive cycles. pure NaNbO3 exhibited strong antibacterial activity, completely inhibiting the growth of s. aureus, E. coli, and K. pneumoniae at the tested concentrations. Although the Zn-doped sample also demonstrated antibacterial action, the response was concentration-dependent. This study is the first report on Zn doping in NaNbO3, as well as the first investigation of its antibacterial activity against K. pneumoniae and s. aureus. © 2025 Elsevier Ltd and Techna Group s.r.l.

关键词： Escherichia coli

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Hydrogen storage properties of the Ti18V24Nb23Cr33Al2Multicomponent Alloy Using Ti6V4Al Alloy scraps as Feedstock Material

ACS Sustainable Resource Management

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ACs sustainable Resource Management 2025年第5期2卷 807-814页

作者： Mariana de Brito Ferraz Claudia Zlotea Walter José Botta Guilherme Zepon Federal University of São Carlos Graduate Program in Materials Science and Engineering (PPGCEM/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil Institut de Chimie et des Matériaux de Paris-Est CNRS UMR 7182 2-8 Rue Henri Dunant 94320 Thiais France Federal University of São Carlos Graduate Program in Materials Science and Engineering (PPGCEM/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil；Federal University of São Carlos Department of Materials Engineering (DEMa/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil

Hydrogen storage in metal hydrides has been extensively studied due to their capacity to reversibly absorb hydrogen under relatively low pressures. Multicomponent alloys, especially those of the Ti-V-Nb-Cr system, have garnered significant attention because of the possibility of fine-tuning the hydrogen storage properties by compositional control. However, most of the investigations on multicomponent alloys rely on high-purity elements as feedstock materials, which can have a substantial environmental impact due to the energy-intensive processes required to achieve such purity levels. In this work, we propose an alternative approach by utilizing Ti6Al4V alloy (AsTM F136) scraps from the biomedical industry as feedstock material to produce Ti18Nb23V24Cr33Al2. The alloy was synthesized by using an arc-melting process, combining Ti6Al4V scraps with other pure elements. structural analysis using X-ray diffraction (XRD) and scanning electron microscopy (sEM) revealed the formation of a microstructure composed predominantly by a body-centered cubic (BCC) solid solution with a small micro segregation providing additional microstructural insights. The Ti18Nb23V24Cr33Al2alloy exhibited a hydrogen storage capacity of 2.75 wt % H2with room temperature reversibility, presenting hydrogen storage properties comparable to those of a (TiVNb)65Cr35alloy produced only from high-purity *** study presents a sustainable approach to producing Ti18Nb23V24Cr33Al2alloy from Ti6Al4V machine chips, achieving efficient hydrogen storage with reduced environmental impact.

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Early and advanced crystallization stages in lithia-alumina-silica glasses nucleated by ZrO2

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Ceramics International 2025年

作者： Revelo, Raúl Julián souza, Mauricio Lima pena, Rafaella Bartz Yoshida, satoshi Zanotto, Edgar Dutra Federal University of São Carlos Graduate Program in Materials Science and Engineering SP São Carlos13565-905 Brazil São Carlos Institute of Physics University of São Paulo SP São Carlos13566-590 Brazil Materials Integration Laboratories AGC Inc 1-1 Suehiro-Cho Tsurumi-Ku Kanagawa Yokohama230-0045 Japan

ZrO2 is one of the most effective and widely used nucleating agents in various families of glass-ceramics;however, its detailed mechanism remains a subject of debate. Understanding its nucleation mechanism requires a thorough analysis of microstructural evolution and the identification of factors influencing this process. This study investigates the effects of ZrO2 incorporation on the internal nucleation and microstructural evolution in stoichiometric LAs (Li2O·Al2O3·nsiO2) glass-ceramics of varying composition. Glasses with different siO2 molar ratios (n = 2, 4, 5, and 6) were prepared with ZrO2 additions of 3.0 and 3.5 mol%. several thermal treatments were employed, followed by characterization using XRD, sEM, sTEM, and Raman spectroscopy. The results indicate that a minimum of 3.5 mol% ZrO2 is required to induce internal nucleation in LAs glasses with n = 4, 5, and 6. In these compositions, Zr-enriched regions formed through liquid-liquid phase separation serve as preferential sites for ZrO2 crystal precipitation, which subsequently induces the nucleation of β-quartz solid solution. Upon further treatment at higher temperatures, this metastable phase transforms into β-spodumene or its solid solution. As expected, increasing siO2 content enhances glass network polymerization, as evidenced by the increased presence of Q3 species in Raman spectroscopy, leading to higher characteristic temperatures of glass transition and peak crystallization in DsC analyses. A higher siO2 content results in fewer but larger crystals, whereas a lower siO2 content promotes a higher number density of crystals within the glass matrix. © 2025 Elsevier Ltd and Techna Group s.r.l.

关键词： Glass ceramics

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Can air carbon arc gouging sensitize stabilized or low-carbon austenitic stainless steel?

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International Journal of pressure Vessels and piping 2025年 217卷

作者： de Bribean Guerra, Arthur Campesan, Gabriel Roberto Bolfarini, Claudemiro Koga, Guilherme Yuuki Federal University of São Carlos Department of Materials Science and Engineering Rod. Washington Luís SP São CarlosCEP 13565–905 Brazil Federal University of São Carlos Graduate Program in Materials Science and Engineering Rod. Washington Luís SP São CarlosCEP 13565–905 Brazil Rod. Washington Luís SP São CarlosCEP 13565–905 Brazil

This paper challenges the widespread skepticism surrounding the use of air carbon arc gouging (ACAG) in repair welding for critical applications in stainless steels, such as oil and gas assets, by evaluating its effects on the electrochemical properties of AIsI 316L and AIsI 321 austenitic stainless steels. This investigation examines the degree of sensitization and intergranular corrosion susceptibility in a simulated repair scenario. The experimental setup involved creating a gouged groove (6–7 mm depth) adjacent to the heat-affected zone (HAZ) using air carbon arc gouging (ACAG), followed by rewelding via submerged arc welding (sAW). Welded joints were analyzed under three surface preparation conditions after gouging: i) no cleaning, ii) brushing, and iii) rectifying. Electrochemical evaluation was conducted using the double loop potentiokinetic reactivation (DL-EpR) technique in accordance with IsO 12732:2017, while susceptibility to intergranular corrosion was assessed using AsTM A262-15, practice A, oxalic acid etching tests. The results debunk the prevailing assumption that ACAG inevitably compromises the corrosion resistance of stainless steels. They demonstrate that, even without post-process cleaning, the procedure does not increase sensitization or susceptibility to intergranular attack. These findings validate ACAG as a viable, efficient, and cost-effective method for repair welding in low-carbon or stabilized austenitic stainless steels, simulating field conditions. This includes demanding industries such as oil and gas, where it ensures effective defect removal and full weld penetration while preserving asset integrity and resistance to localized corrosion. © 2025 Elsevier Ltd

关键词： Austenitic stainless steel

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Corrigendum to "Effect of cell imprinting on viability and drug susceptibility of breast cancer cells to doxorubicin" [Acta Biomaterialia, 2020, 113, 119-129] (Acta Biomaterialia (2020) 113 (119–129), (s1742706120303287), (10.1016/***.2020.06.007))

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Acta Biomaterialia 2025年 198卷 571-572页

作者： shahriyari, Fatemeh Janmaleki, Mohsen sharifi, shahriar Hesar, Milad Eyvazi Hoshian, sasha Taghiabadi, Reza Razaghian, Ahmad Ghadiri, Majid peirovi, Afshin Mahmoudi, Morteza Nezhad, Amir sanati Khademhosseini, Ali Division of Engineering in Medicine Department of Medicine Brigham and Women's Hospital Harvard Medical School CambridgeMA United States Division of Health Sciences & Technology Harvard-Massachusetts Institute of Technology Massachusetts Institute of Technology CambridgeMA United States Department of Materials Engineering Faculty of Engineering Imam Khomeini International University Qazvin Iran Biomedical Engineering Graduate Program University of Calgary Canada Precision Health Program and Department of Radiology Michigan State University East LansingMI48824 United States RWTH Aachen University Templergraben 55 Aachen52062 Germany Department of Chemistry and Materials Science Aalto University School of Chemical Engineering Espoo Finland Department of Mechanical Engineering Faculty of Engineering Imam Khomeini International University Qazvin Iran Nano-Biotechnology Department Pasteur Institute of Iran Tehran Iran Departments of Bioengineering Chemical and Biomolecular Engineering and Radiological Sciences Center for Minimally Invasive Therapeutics California NanoSystems Institute University of California – Los Angeles Los AngelesCA United States Terasaki Institute for Biomedical Innovation Los AngelesCA United States

The authors regret to report that the images for panels h (plain pDMs) and I (MCF7-imprinted pDMs) in Fig. 3 were mistakenly taken from the same dataset, resulting in the omission of the correct image in panel h for the plain pDMs day 7 image. We sincerely apologize for this error. For an accurate representation, please see the corrected Fig. 3 provided here along with its original figure caption. This does not affect the validity of the statistical analyses or the overall conclusions drawn from the study. © 2025

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Claw coloration in the fiddler crab Leptuca uruguayensis has no correlation with male quality

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Current Zoology 2025年第1期71卷 109-123页

作者： Zackary A.Graham Jonatas de Jesus Florentino samuel p.smithers Joao C.T.Menezes Jose Eduardo de Carvalho Alexandre V.palaoro Department of Organismal Biology Ecologyand Zoo ScienceWest Liberty University208 University DriveWest LibertyWV 26074USA Programa de Pós-Graduacao em Ecologia Universidade de São PauloRua do Mataon 321Trav.14ButantãDistrictSao PauloSP 05508-090Brazil Department of Psychology Northeastern University360 Huntington AvenueBostonMA 02115USA Organismic and Evolutionary Biology Graduate Program University of Massachusetts Amherst230 Stockbridge RoadAmherstMA 01003USA Departamento de Ecologia e Biologia Evolutiva Universidade Federal de Sao PauloRua Sao Nicolaun 210Centro DistrictDiademaSP 09972-270Brazil Department of Materials Science and Engineering Clemson University515 Calhoun DrClemsonSC 29634USA Departamento de Zoologia Universidade Federal do ParanáAvenida Coronel Francisco H.dos Santosn 100Jardim das Américas DistrictCuritibaPR 82590-300Brazil

sexual selection is thought to play a major role in the evolution of color due to the correlation between a signaler’s physiological state and the displayed *** such,researchers often investigate how color correlates to the quality of the ***,research on the relationship between color and individual quality is often taxonomically limited and researchers typically investigate how color phenotypes relate to one index of quality,such as a linear measure of body ***,we investigated the relationship among body size,claw size,claw muscle mass,lipid content,and the color of the claw in male fiddler crabs(Leptuca uruguayensis)which wield an exaggerated claw that varies in color from brown to *** hypothesized that if the color was correlated to one or more indices of male quality,the color displayed on the claws of male *** could be under sexual *** found *** claw color varies substantially among the individuals we ***,we did not find a correlation between claw color and indices of quality;neither brightness nor hue correlated to the indices of quality we *** findings suggest that claw color in *** is unlikely to have evolved to signal quality,but may instead function as a species identity or as a non-indicator sexual signal.

关键词： animal coloration animal communication animal signals Decapoda non-indicator sexual signal sexual selection

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Antioxidant system alterations and oxidative stress caused by polyfluoroalkyl substances (pFAs) in exposed biota: a review

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science of the Total Environment 2025年 977卷 179395页

作者： soares, Lorena Oliveira souza de Araujo, Gabriel Farias Gomes, Thais Braga Júnior, sidney Fernandes sales Cuprys, Agnieszka Katarzyna soares, Raquel Moraes saggioro, Enrico Mendes Laboratory of Environmental Health Assessment and Promotion Oswaldo Cruz Institute Oswaldo Cruz Foundation Av. Brasil 4365 RJ Rio de Janeiro21045-900 Brazil Post-Graduate Program in Public Health and Environment Sergio Arouca National School of Public Health Oswaldo Cruz Foundation Av. Leopoldo Bulhões 1480 RJ Rio de Janeiro21041-210 Brazil Faculty of Science and Technology Norwegian University of Life Sciences P.O. Box 5003 Ås1432 Norway Post-Graduate Program in Environmental Technology and Water Resources Department of Civil and Environmental Engineering – FT University of Brasília Darcy Ribeiro Campus Via L3 Norte DF Brasília70910-900 Brazil

Contamination of aquatic and terrestrial organisms by perfluoroalkyl substances (pFAs), emerging contaminants, is widespread, as these compounds are present in water, soil, air, and food, owing to their environmental persistence. pFAs exposure induces biochemical process alterations associated with the disruption of the antioxidant defense system in several species. This review aims to discuss how pFAs-induced antioxidant system alterations lead to changes in biochemical processes in different organisms exposed to these pollutants. This disruption, then leads to an imbalance in antioxidant defense systems, contributing to the formation of reactive oxidative species (ROs), which, in turn, can be exacerbate oxidative stress, induce cellular damage, enhance lipid peroxidation, destabilize lysosomal membranes, and cause genotoxic effects, ultimately compromising DNA integrity. In acute tests, pFAs have led to mortality, growth inhibition, diminished behavioral and locomotor abilities, and reproductive impairment. pFAs-induced effects differ with varying species or types of substances, and further bioaccumulation through food chains exacerbates environmental contamination, carrying considerable risks. These findings demonstrate the complex and enduring impact of pFAs on environmental health, emphasizing the importance of this review in corroborating studies on sub-lethal toxicity in exposed organisms and how these effects reflect on the environment. © 2025 Elsevier B.V.

关键词： Biotic

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