Article
Materials Science, Ceramics
Ali Talimian, H. F. El-Maghraby, Monika Michalkova, Dusan Galusek
Summary: Adding 0.3 wt% lithium hydroxide can promote densification and limit grain growth of MgAl2O4, while also affecting the activation energy of sintering. The formation and disappearance of secondary phases were observed, with magnesium oxide and lithium aluminum oxide produced at certain temperatures.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Somnath Sinhamahapatra, Chandrima Ghosh, Himansu Sekhar Tripathi, Sunanda Mukhopadhyay
Summary: The magnesium aluminate spinel was prepared from constituent oxides through a solid-state sintering process at temperatures ranging from 1550 to 1700 degrees C in a normal air atmosphere. The addition of TiO2 and Yb2O3 improved the densification and mechanical properties of the magnesia-rich spinel, with Yb2O3 showing better performance in room temperature flexural strength.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
L. Zarazua-Villalobos, G. Fantozzi, G. Bonnefont, L. Tellez-Jurado, H. Balmori-Ramirez
Summary: Transparent magnesium aluminate spinel was obtained through one-step spark plasma reaction-sintering (SPRS) using different precursor powders. The HT450 and HT850 powders showed better sinterability and transparency, likely due to the higher reactivity of their precursor particles.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Aref Basiri, Amir Hossein Nassajpour-Esfahani, Mohammad Reza Haftbaradaran-Esfahani, Amir Alhaji, Ali Shafyei
Summary: This study investigated the granulation process of magnesium aluminate spinel powders using spray freeze drying method. The optimal amount of binder was found to be 3%, and the ideal solid load was determined to be 35 wt%, resulting in granules of 10-50 μm in size. Powder granulation increased density by approximately 20% and improved the in-line transmission for the IR range by over 15%.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Wenyu Zan, Beiyue Ma, Yutong Cao, Jialong Tian, Zhangyan Zhou, Lulu Wang, Zhouhua Jiang
Summary: In this study, MgAl2O4 spinel materials were synthesized using a single-step reaction sintering method. The effects of (MgO + Al2O3) content, molding pressure, and YSZ additive on the properties of the material were investigated. The results showed that increasing (MgO + Al2O3) content and molding pressure favored the formation of the second MgAl2O4 spinel but also increased the apparent porosity. YSZ addition induced defects and improved the sintering and mechanical properties. The optimal material was obtained with the addition of 1 wt% YSZ, 80 wt% of (MgO + Al2O3), and molding at 200 MPa, followed by sintering at 1600 degrees C for 2 h. The material exhibited high strength retention and comprehensive performance after thermal shock.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Man Zhang, Jianhua Liu, Junwen Zhou
Summary: The effect of Eu2O3 doping amount on the densification behavior of MgAl2O4 and its corrosion resistance to aluminum electrolyte was studied. The results showed that Eu2O3 doping contributed to the densification of MgAl2O4, and the sample with 3 wt.% Eu2O3 had the highest relative density and hardness. Additionally, this sample exhibited the best corrosion resistance to aluminum electrolyte.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Biswajit Baruah, Ritwik Sarkar
Summary: This study investigated the effect of samarium oxide (Sm2O3) as an additive on the properties of stoichiometric magnesium aluminate spinel using different raw material sources. Six spinel batches were prepared with commercially available alumina and magnesia, and the effect of Sm2O3 addition on the properties of the spinel compositions was studied. The results showed that 1% of Sm2O3 addition led to improved densification and strength of the spinel compositions.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Ceramics
Brian M. Rogers, Isabella L. M. Costa, Weidi Zhu, Sabyasachi Sen, Ricardo H. R. Castro
Summary: Beryllium-magnesium aluminate (Be0.1Mg0.9Al2O4 and Be0.2Mg0.8Al2O4) nanoparticles were synthesized and sintered to achieve near full density ceramics at the nanoscale. The sintered nanoceramics showed reduced optical transmission in the infrared range compared to beryllium-free MgAl2O4 nanoceramics. The Vickers hardness of the samples remained constant regardless of grain size. Beryllium ions formed solid solutions with the MgAl2O4 spinel structure and did not significantly affect grain boundaries or mechanical properties.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Wenyu Zan, Beiyue Ma, Jianhuai Tang, Kun Liu, Yutong Cao, Jialong Tian, Zhouhua Jiang
Summary: Co-doping of CeO2 and La2O3 can improve the densification and mechanical properties of MgAl2O4 spinel ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Ahmed A. M. El-Amir, Shufeng Li, Mahmoud Abdelgawad, Emad M. M. Ewais
Summary: c-zirconia ceramic composites were successfully synthesized by SPS technique with MA addition, resulting in improved stability and strength. The SPS sintering process led to dense compacts with refined microstructure and superior compaction resistance, showing great potential for high-tech engineering applications.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Isabella L. M. Costa, Joice Miagava, Ricardo H. R. Castro
Summary: This study proposes that sodium can be used as a dopant to effectively reduce the processing requirements for manufacturing nanoceramics, and successfully produces fully dense transparent sodium-doped magnesium aluminate with grain sizes below 15 nm. The sodium-doped samples exhibit higher indentation fracture toughness compared to undoped samples with similar grain sizes.
Article
Materials Science, Ceramics
Songtong Xuan, Xiaojun Wang, Yuming Tian, Jianying Hao
Summary: The study found that the flexural strength of synthetic materials first decreased and then increased as the relative content of bauxite decreased. When n(Al2O3)/n(MgO) was 1, spinel was the primary phase and the sample was dense. The flexural strength was maximized at 106.48 MPa when the temperature reached 1450 degrees C.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Engineering, Biomedical
Mehran Ghodrati, Seyed Mahdi Rafiaei, Lobat Tayebi
Summary: In this study, magnesium aluminate spinel (MgAl2O4) nanoparticles were synthesized using a combustion approach and then incorporated into PLA to prepare scaffolds. The crystal structure, microstructure, biodegradability, and thermal characteristics of the materials were investigated using XRD, FESEM, ICP, STA, and compressive strength analyses. The results showed that PLA/6 wt% MgAl2O4 scaffolds exhibited the highest compressive strength. Immersion of the scaffolds in SBF revealed improved biodegradability, while improper particle dispersion occurred at higher MgAl2O4 loadings.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Markus Mader, Richard Prediger, Karl G. Schell, Gabriela Schmidt, Alex Dorn, Sophie Jenne, Sebastian Kluck, Leonhard Hambitzer, Manuel Luitz, Claudia Schwarz, Marcel Milich, Christian Greiner, Bastian E. Rapp, Frederik Kotz-Helmer
Summary: This study develops a thermoplastic nanocomposite that can be shaped into transparent ceramics using polymer injection molding. The process involves several steps to achieve high density, high optical transmission, and high mechanical strength in the transparent ceramics. By making transparent ceramics accessible to high-throughput polymer processing techniques, this research enables fast and cost-efficient manufacturing of macroscopic and microstructured components, opening up a wide range of potential applications.
Article
Chemistry, Analytical
Ramin Riahi, Mohammad Ali Taher, Hadi Beitollahi
Summary: In this study, a sensitive HA electrochemical sensor was developed using the electrocatalytic performance of magnesium aluminate spinel nanoparticles. The modified electrode displayed admirable electrocatalytic performance towards HA, enabling successful detection of HA in water specimens with a low limit of detection.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Thermodynamics
Ricardo I. Castro, Jaime Gallego, Marcos Flores Garcia, Adolfo Marican, Oscar Forero-Doria
Summary: A methodology was developed for determining the adulteration of edible oils based on thermal analysis and statistical models, allowing for the determination of the percentage of mixture by analyzing peaks of different oils.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Materials Science, Paper & Wood
Ricardo I. Castro, Ana Gonzalez-Feliu, Felipe Valenzuela-Riffo, Carolina Parra-Palma, Luis Morales-Quintana
Summary: Evidence suggests that ABA promotes fruit ripening in strawberries by degrading cell wall polymers, especially hemicellulose, as shown through thermogravimetric analysis. Samples treated with an ABA biosynthesis inhibitor maintained thermal stability, indicating a link between thermal stability, transcriptional analysis, and enzymatic activity. These findings provide insight into changes in cell wall polymers during fruit ripening mediated by the ABA hormone.
Article
Medicine, General & Internal
Maria Elvira Balcells, Luis Rojas, Nicole Le Corre, Constanza Martinez-Valdebenito, Maria Elena Ceballos, Marcela Ferres, Mayling Chang, Cecilia Vizcaya, Sebastian Mondaca, Alvaro Huete, Ricardo Castro, Mauricio Sarmiento, Luis Villarroel, Alejandra Pizarro, Patricio Ross, Jaime Santander, Barbara Lara, Marcela Ferrada, Sergio Vargas-Salas, Carolina Beltran-Pavez, Ricardo Soto-Rifo, Fernando Valiente-Echeverria, Christian Caglevic, Mauricio Mahave, Carolina Selman, Raimundo Gazitua, Jose Luis Briones, Franz Villarroel-Espindola, Carlos Balmaceda, Manuel A. Espinoza, Jaime Pereira, Bruno Nervi
Summary: The study did not find evidence of benefit in mortality, length of hospitalization, or mechanical ventilation requirement by immediate addition of CP therapy in the early stages of COVID-19 compared to its use only in case of patient deterioration.
Article
Materials Science, Paper & Wood
Ricardo I. Castro, Marcelo Munoz-Vera, Carolina Parra-Palma, Felipe Valenzuela-Riffo, Carlos R. Figueroa, Luis Morales-Quintana
Summary: The fruit of Fragaria chiloensis, known as Chilean strawberry, is praised for its exceptional taste and aroma. However, it is prone to softening at a high rate. A study on the changes in cell wall-associated polysaccharide contents of Chilean strawberry fruit revealed lower thermal stability in ripe samples and a higher cumulative depolymerization rate. This relationship between cell wall polymer degradation and solid soluble concentration/firmness ratio can help understand fruit development.
Article
Physics, Applied
Bhagyashree Jamadagni, Klaus van Benthem
Summary: This study investigated the long-range edge retraction of kinetically constrained thin films of Au and Ni, revealing the presence of multiple microstructurally distinct regions across the receding edge. The width of these regions depends on the deposition sequence of the two metal films and annealing temperature, with the presence of native nickel oxide significantly affecting the kinetics of long-range edge retraction. The formation of these multiple regions is suggested to be part of the kinetic evolution of long-range edge retraction of metal bilayer films.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Andrew M. Thron, Jianyi Gao, Burcu Ercan, Matthew A. Laurent, Srabanti Chowdhury, Klaus van Benthem
Summary: The study reveals that the growth of oxide layers in InAlN films is initially reaction limited and then becomes diffusion limited after reaching a certain thickness. With increasing annealing time, the growing oxide layers become amorphous and porous.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Polymer Science
Ricardo I. Castro, Luis Morales-Quintana, Nancy Alvarado, Luis Guzman, Oscar Forero-Doria, Felipe Valenzuela-Riffo, V. Felipe Laurie
Summary: The study aimed to characterize and optimize the formation of molecular complexes using calcium alginate and reduced glutathione, with varying concentrations of calcium and GSH analyzed for their influence on microcapsule production. The optimal conditions proposed by response surface methodology were found to result in a theoretical concentration of 0.043 mg GSH per mg of CAG complex.
Article
Agronomy
Ricardo I. Castro, Marcelo Munoz-Vera, Luis Morales-Quintana
Summary: A comparative study of the changes in the physicochemical properties of the cell wall-associated polysaccharide contents of two strawberry fruit cultivars, Cristal and Portola, revealed that Cristal sample exhibited higher thermal stability than Portola sample.
Article
Biochemistry & Molecular Biology
Luis Guzman, Cristobal Parra-Cid, Etiennette Guerrero-Munoz, Carlos Pena-Varas, Efrain Polo-Cuadrado, Yorley Duarte, Ricardo I. Castro, Luz Stella Nerio, Ramiro Araya-Maturana, Tewodros Asefa, Javier Echeverria, David Ramirez, Oscar Forero-Doria
Summary: This study evaluated the antimicrobial properties of different ILs, finding that some exhibit good antibacterial activity against S. aureus, E. coli, and P. aeruginosa. Particularly, tert-butyl N-methylphenolimidazolium salts showed the best antibacterial efficacy. Furthermore, the antimicrobial effectiveness was found to be influenced by the alkyl chain length and substituents on the phenolic ring.
BIOORGANIC CHEMISTRY
(2021)
Article
Materials Science, Ceramics
Boyi Qu, Klaus van Benthem
Summary: Anisotropic growth of NiO nanostructures was observed in individual nickel nanoparticles at 800 degrees C under water vapor atmosphere, with growth rates below 1.8 nm/s; the growth is energetically favored in areas with high local surface energy density, requiring the presence of water vapor.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Biochemistry & Molecular Biology
Joao A. Baptista, Mario T. S. Rosado, Ricardo A. E. Castro, Antonio O. L. Evora, Teresa M. R. Maria, Manuela Ramos Silva, Joao Canotilho, M. Ermelinda S. Eusebio
Summary: In this study, co-crystal screening was conducted for DHFR inhibitors, revealing low propensities for co-crystallization with certain co-formers. Successful synthesis of multi-component solid forms was achieved for all target molecules, and the crystalline structures of co-crystals and solvates were determined. The study demonstrated the potential use of the pharmacophore of DHFR inhibitors as a guide for co-crystal screening, showing similarities in the solid state associations and molecular aggregations in the co-crystals.
Article
Nanoscience & Nanotechnology
Boyi Qu, Klaus van Benthem
Summary: This study reports the one-directional growth of single crystalline nickel oxide nanostructures that is facilitated by the oxidation of nickel nanoparticles. By in-situ high resolution transmission electron microscopy, layer-by-layer growth at the buried NiO/Ni interface was directly observed. The results demonstrate the applicability of the terrace-ledge-kink crystal growth model for reactive crystal growth processes at internal heterophase interfaces.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Ceramics
Boyi Qu, Daria Eiteneer, Lauren A. Hughes, Jan-Helmut Preusker, Joseph Wood, Wolfgang Rheinheimer, Michael J. Hoffmann, Klaus van Benthem
Summary: During thermal annealing at 1425 degrees C, nominal electric field strengths of 50 V/mm and 150 V/mm were applied along the grain boundary planes of a near 45 degrees (100) twist grain boundary in SrTiO3. Interface expansions of approximately 0.8 nm were observed near the positive electrode for both field strengths. However, annealing at 50 V/mm resulted in a decrease in interface width to around 0.4 nm, while higher field strength caused decomposition of the boundary structure close to the negative electrode. The migration of oxygen due to the applied electric field leads to the observed alteration of grain boundary structures, and at high field strengths, the agglomeration of anion vacancies can cause grain boundary decomposition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Andre A. Bernardes, Andre L. da Silva, Jefferson Bettini, Jair C. C. Freitas, Ricardo H. R. Castro, Douglas Gouvea
Summary: Interface segregation plays a crucial role in the properties of nanocrystalline ceramics. This study investigates the spatial distribution of Li+ dopants in magnesium aluminate spinel nanoparticles and reveals a clear correlation between the microstructure of the nanoparticles and the distribution of Li+.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Electrochemistry
Joseph G. Wood, Luke van Buuren, Ziang Guo, Ece Deniz, Marina S. Leite, Arthur C. Carpenter, Charles E. Hunt, Klaus van Benthem
Summary: Anodic electrolytic etching of germanium has been experimentally studied, and the current and etch-depths during the process were measured and tracked. The results indicate that the etching mechanism for germanium is significantly different from that of silicon, and the processing techniques cannot be directly transferred between the two materials.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Ceramics
Zilong Xiong, Wenzhuo Xue, Mujun Li, Feihu Tan, Yupeng Chen, Hongyu Yu
Summary: In this study, CBS glass/Al2O3 composites were developed for LTCC applications based on a CaO-B2O3-SiO2 (CBS) glass system with a high boron content. The study revealed that the softening of glass and interfacial reaction between the glass and Al2O3 were the two most important factors affecting LTCC's densification process. Real-time shrinkage rate of LTCC during sintering was successfully simulated, and it was proven that the formation of the CaAl2(BO3)O phase played a significant role in reducing glass viscosity and promoting dense structure formation. The resulting LTCC composite exhibited excellent performance for high-frequency applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Saurabh Kumar Sharma, Vinita Grover, Rakesh Shukla, Abid Hussain, Ambuj Mishra, Pawan Kumar Kulriya
Summary: In this study, the disordering caused by swift heavy ion irradiation in two different compositions of pyrochlore structures was investigated. X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy were used to analyze the samples before and after irradiation. It was found that both compositions underwent amorphization due to irradiation, with a slower rate observed in Nd1.8Zr2.2O7.1. The irradiation-induced modified track region in Nd1.8Zr2.2O7.1 consisted of defect-rich pyrochlore structure, anion-deficient fluorite structure, and amorphous domains.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiabei He, Mengshan Song, Ming Yang, Miaomiao Zhu
Summary: This study investigates the influence of ion irradiation on high-entropy ceramics and finds that irradiation-induced lattice rearrangement can improve the radiation resistance of these ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yajie Yu, Shi He, Zhengang Zhang, Haihua Chen, Peipeng Jin, Binnian Zhong, Linhui Zhang, Liping Wang, Cheng Lu
Summary: Silicide ceramics, including tantalum disilicide (TaSi2), are known for their exceptional physical properties but are limited in practical applications due to their inherent brittleness at room temperature. In this study, we successfully improved the mechanical properties of TaSi2 ceramics and increased their electrical conductivity by modifying the preparation methods and sintering conditions. These findings provide valuable insights for future applications of TaSi2 and the design of advanced ceramic materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jian Li, Jia Liu, Yongcui Zhang, Wei Sun, Yang Wang, Haitao Wu, Ling Li, Chuanbing Cheng, Yingying Wang, Ke Tan, Futian Liu
Summary: Microstructure design plays a crucial role in regulating the microwave dielectric properties of materials, however, the understanding of frequency temperature stability and related micromechanism remains limited. In this study, a combination of first-principles calculations and experimental observation was used to investigate the correlation among sintering behavior, crystal structure, bonding nature, and microwave dielectric properties of LnPO(4) (Ln = Eu, Pr) ceramics. The research findings systematically clarify the optimized effect and micromechanism of lanthanides on the dielectric properties of monazite ceramics, providing insights into the design and enhancement of microwave dielectric materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wenqian Pan, Xizhen Xia, Wei Zhou, Yang Li
Summary: The study investigates the frictional and wear behaviors of carbon fiber-reinforced SiC ceramic matrix composites with different fiber orientations mating with ceramic balls. The results show that fiber orientation significantly affects the friction and wear properties of the composites. Pads with randomly arranged fibers demonstrate better friction stability and lower wear volume, potentially suitable for bearing material applications. The research also explores the factors influencing the formation of continuous tribo-film and identifies abrasive wear and oxidation wear as the dominant wear mechanisms for the friction pairs.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sergey Nikolaevich Perevislov, Ilya Evgenievich Arlashkin, Valentina Leonidovna Stolyarova
Summary: This paper describes the synthesis and sintering of MAX phases in the Zr-Al-C system. Different mixtures of initial Zr/Al/C and Zr/Al/ZrC powders were used to synthesize Zr2AlC and Zr3AlC2 MAX phases. The highest content of Zr3AlC2 MAX phase was obtained using a component ratio of 1:1.5:2-51.1 vol.% of Zr/Al/ZrC powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Weijia Luo, Xubin Wang, Baiheng Bai, Jianli Qiao, Xingcong Chen, Yongzheng Wen, Jingbo Sun, Lingxia Li, Ji Zhou
Summary: This study successfully establishes the relationship between internal strain and dielectric loss by synthesizing and designing specific structure of tungsten bronze ceramics, and concludes that controlling internal strain can effectively reduce dielectric loss. This research is of great significance for the development of future all-ceramic non-Hermitian devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Santanu Mondal, Juan Diego Shiraishi Lombard, Sreenivasulu Gollapudi, Carolina Tallon, Jie-Fang Li, Dwight Viehland
Summary: Ultrafast high-temperature sintering (UHS) is an effective method for rapidly densifying ZrB2 powders. The final grain size increases with longer sintering duration. X-ray diffraction and energy-dispersive spectroscopy show crystalline phase and compositional uniformity in ZrB2 after UHS.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
JiaNan Wang, ZhiQiang Li, YongZheng Zhu, Yao Liang, Yan Cui, HuaLong Tao, Bo Song, Alexander Nikiforov, ZhiHua Zhang
Summary: First-principles calculations were performed to investigate the crystal structure, electronic structure, and ion diffusion of sulfur-doped Li2FeSiO4. The results showed that sulfur doping can improve the electronic conductivity and reduce the energy barrier for ion diffusion.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Xiaodi Dai, Serdar Aydin, Mert Yuecel Yardimci, Gunter Reekmans, Peter Adriaensens, Geert De Schutter
Summary: This study investigates the rheological behavior, solidification process, and nanostructure changes of sodium hydroxide-activated slag (NH-AAS) and sodium silicate-activated slag (SS-AAS) pastes over time. The results show that NH-AAS and SS-AAS release similar heat and reach a similar reaction degree at their initial setting times, but have different gel structures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yanliang Ji, Simon Becker, Zichen Lu, Alexander Mezhov, Regine von Klitzing, Schmidt Wolfram, Dietmar Stephan
Summary: This study reveals the significant influence of resting time on the rheological properties of cement suspensions, which is closely related to non-absorbed polycarboxylate superplasticizers (PCEs) size variation. Adsorbed PCE during resting tends to bridge particles instead of dispersing them, leading to an increased yield stress.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu
Summary: This study investigates the effect of K/Na ratio on the phase structure, ferroelectric domains, and piezoelectric properties of potassium sodium niobate (KNN)-based ceramics. It reveals that high Na+ content leads to large ferroelectric domains, while high K+ content results in local polarity heterogeneity and distinct dielectric relaxational behavior. The balanced local polarity and stress heterogeneities contribute to improved piezoelectricity.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zun Xia, Yedong Rong, Hao Li, Ye Dong, Hongbo Yu, Jie Xu, Xiuhui Wang, Jinlong Yang
Summary: This study presents the synthesis of hollow MgAl2O4 particles in situ within porous ceramics, resulting in volume expansion and the formation of a hierarchical pore structure, leading to a significant improvement in compressive strength.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Honglong Wang, Zhiguo Sun, Faming Xia, Chenguang Yang, Xiaoguang Wang, Jintang Li, Linxu Jiang
Summary: In this study, the micro-geometry morphology variation and microstructural transformation mechanism of muscovite crystals under electron beam irradiation were explored. The results revealed the instability of the muscovite lattice under irradiation, as well as the expansion and shrinkage of the lattice with increasing dose. The study also identified changes in chemical structure and other mechanisms involved. These findings are significant for the design of radiation-resistant silicate materials and the manufacturing of electronic components used in the aerospace industry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2024)