Article
Chemistry, Physical
Mirabbos Hojamberdiev, Juan Manuel Mora-Hernandez, Ronald Vargas, Eva Maria Heppke, Kunio Yubuta, Akira Yamakata, Zukhra Kadirova, Leticia Torres-Martinez, Katsuya Teshima, Martin Lerch
Summary: The presence of TiN in LaTiO2N material improves the photoelectrochemical performance by enhancing charge separation and transport, resulting in longer lifetimes of charge carriers.
MATERIALS TODAY ENERGY
(2022)
Article
Chemistry, Physical
Guangmeimei Yang, Yuxiang Zhou, Mengnan Wang, James Murawski, Louise I. Oldham, Tian Tian, Ifan E. L. Stephens, Andreas Kafizas.
Summary: Titanium nitride has desirable properties for electrocatalysis and catalyst support. The oxygen content in the material plays a critical role in its ability to drive the hydrogen evolution reaction. Minimizing bulk oxygen content is important for achieving a more conductive and active material.
Article
Chemistry, Inorganic & Nuclear
Ran Wang, Qi Wang, Jun Qian, Xiaoxiang Xu
Summary: Solid solutions between LaNbON2 and LaMg2/3Nb1/3O3 have been investigated for water oxidation under visible light illumination, showing improved photocatalytic activity. The formation of solid solutions provides a useful tool to steer photocatalytic performance and opens new opportunities for efficient photocatalysts development for solar energy conversions.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Multidisciplinary Sciences
Haijun Feng, Ning Zheng, Wenjun Peng, Chujun Ni, Huijie Song, Qian Zhao, Tao Xie
Summary: Researchers have developed a thiourea-based thermoset elastomer that can be reprocessed with enhanced mechanical properties. The dynamic nature of thiourea bonds allows for reprocessibility, and selective oxidation during high temperature reprocessing strengthens the material chemically.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Takuya Sakata, Risa Yoshiyuki, Ryoki Okada, Sohta Urushidani, Naoki Tarutani, Kiyofumi Katagiri, Kei Inumaru, Kyohei Koyama, Yuji Masubuchi
Summary: A facile method using urea as a nitriding agent was developed to prepare strontium-tantalum perovskite oxynitride and its solid solutions, providing environmentally benign alternatives to conventional inorganic pigments. The use of sol-gel-derived Ta2O5 gel allowed for faster nitridation at lower temperatures compared to conventional processes, while optimization of reaction conditions enabled the production of solid solutions with easily adjustable optical properties. The narrower band gaps of oxynitrides compared to oxides led to optical absorption and chromatic colors in the products.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Utsab Manna, Bobby Portis, Tochukwu K. Egboluche, Muhammad Nafis, Md. Alamgir Hossain
Summary: Two rationally designed molecular clefts based on 4-nitrophenyl, functionalized with thiourea (L (1)) and urea (L (2)), have been synthesized and studied for various anions in DMSO using UV-Vis and colorimetric techniques. Both L (1) and L (2) were found to form 1:1 complexes with halides and oxoanions, with L (1) exhibiting stronger affinity for anions compared to L (2) due to the presence of more acidic thiourea functional groups.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Bruno Zavala-Contreras, Hisila Santacruz-Ortega, Angel Ulises Orozco-Valencia, Motomichi Inoue, Karen Ochoa Lara, Rosa-Elena Navarro
Summary: Two simple chemosensors with urea and thiourea groups were synthesized and studied for their ability to sense acetate, dihydrogen phosphate, and fluoride ions. Changes in UV-vis and H-1 NMR spectra were observed, along with an optical response in the form of color changes in the solutions. Additionally, the fluoride-sensing properties of the chemosensors were studied in DMSO and water solutions, with one of them showing the ability to detect fluoride ions in 100% water solutions.
Article
Chemistry, Medicinal
H. Pavan Kumar, H. K. Kumara, R. Suhas, D. Channe Gowda
Summary: A new small library of molecules containing bis-urea/thiourea pendants in lysine conjugated to three different heterocycles has been synthesized and shown to exhibit potent antimicrobial activity. The presence of urea/thiourea, substituent, and heterocycle is found to be crucial for exerting strong biological effects, with isoxazole being particularly beneficial. Docking studies have demonstrated exceptional binding efficiency for some of the active compounds, indicating their potential as drug candidates for microbial-related diseases.
ARCHIV DER PHARMAZIE
(2021)
Article
Chemistry, Physical
Vasyl Stotskyi, Ulrich Aschauer
Summary: By using density functional theory calculations, the effect of oxygen substitution for nitrogen on the surface electronic structure and catalytic activity of SrNbO2N under OER conditions was investigated. It was found that the substitution of nitrogen by oxygen does enhance reactivity, especially at around 3/4 substitution ratio.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Wenqian Chen, Jinkun Li, Zihan Wang, Heng Wang, Yong Li, Liang Tang
Summary: In this study, TiOxNy nanoparticles were successfully synthesized using a layered oxide and urea as the nitrogen source. By controlling the reaction temperature, the O/N ratio can be adjusted. This work highlights the potential of the solid-state method in tailoring the properties of TiOxNy nanoparticles and presents a novel approach for synthesizing oxynitrides.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Mohammad A. Khasawneh, Ayesha AlKaabi, Abdelouahid Samadi, Priya Antony, Ranjit Vijayan, Lamya Ahmed Al-Keridis, Haythem A. Saadeh, Nael Abutaha
Summary: A series of novel urea and thiourea derivatives of 8-hydroxyquinoline were designed, synthesized, and evaluated for their anticancer activities. The structures of the new compounds were determined using spectroscopic techniques, and their cytotoxicity against breast cancer cell lines was assessed. Molecular docking studies revealed potential interactions between these compounds and proteins associated with breast cancer.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Diksha Thakur, Shou-En Chiang, Russel Sevilla, Chi-Tsu Yuan, Sheng Hsiung Chang, Chao-Yi Tai
Summary: By using urea and thiourea small molecules as dopants, the morphology and crystallinity of perovskite thin films are regulated, effectively improving the power conversion efficiency and stability of perovskite solar cells. The PCE of thiourea-doped perovskite solar cells gradually increases from 12.12% to 18.38% over a storage duration of 40 days.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Chemistry, Inorganic & Nuclear
Anirban Karmakar, Susanta Hazra, Armando J. L. Pombeiro
Summary: Coordination polymers (CPs) and metal-organic frameworks (MOFs) constructed by self-assembly of metal ions and multidentate organic linkers have shown significant potential in diverse applications such as gas adsorption and separation, catalysis, and sensing. The tunability of functional organic ligands is crucial for the design of CPs/MOFs, and the incorporation of urea and thiourea groups has attracted considerable attention due to their conformational flexibility and strong hydrogen bonding capabilities. This review summarizes the recent developments in urea and thiourea functionalized frameworks, discussing their synthesis, structure, and applications in gas adsorption and separation, catalysis, and sensing.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Chemistry, Inorganic & Nuclear
Jhonatan R. Guarin, Carlos Frontera, Judith Oro-Sole, Jaume Gazquez, Clemens Ritter, Josep Fontcuberta, Amparo Fuertes
Summary: Europium tantalum perovskite oxynitrides were successfully prepared by a new high-temperature solid-state synthesis method. The crystal structure and magnetic properties of the materials can be tuned by different reactant mixtures and gas atmospheres. Among them, Eu3Ta3O3.66N5.34 is the first example of a triple perovskite oxynitride.
INORGANIC CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Robert Szczesny, Tuan K. A. Hoang, Liliana Dobrzanska, Duncan H. Gregory
Summary: In this study, an alternative strategy for preparing nanoscale Cu3N was described. Copper(II) oxide/hydroxide nanopowder precursors were successfully fabricated by solution methods. Cu3N particles with diverse morphologies were synthesized from oxygen-containing precursors in two-step processes, demonstrating the potential for preparing Cu3N/SiO2 nanocomposites.
Review
Food Science & Technology
Shikai Zhang, Geoffrey I. N. Waterhouse, Fangzhou Xu, Ziyang He, Yuyi Du, Yujing Lian, Peng Wu, Dongxiao Sun-Waterhouse
Summary: This review provides an overview of the extraction and modification methods, health-promoting properties, and pharmaceutical/biomedical applications of pectins, as well as the structural and physicochemical elements responsible for their health benefits. Pectins can be tailored to possess specific functionalities for various applications through appropriate extraction and modification technologies based on green chemistry principles. The physicochemical characteristics of pectins enable the construction of pectin-based composites with distinct properties for targeted applications in bioactive/drug delivery, edible films/coatings, nano-/micro-encapsulation, wound dressings, and biological tissue engineering.
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
(2023)
Article
Chemistry, Multidisciplinary
Lin Ai, Ziqi Song, Mingjun Nie, Jingkun Yu, Fukang Liu, Haoqiang Song, Biao Zhang, Geoffrey I. N. Waterhouse, Siyu Lu
Summary: Carbon dots (CDs) with color-tunable solid-state fluorescence (SSF) were obtained through surface ligand modulation, enabling emission wavelengths to be switched smoothly by altering conjugation ability. Three-dimensional printing was used to create a range of emissive objects, demonstrating the commercial potential for use in optical lamps.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
De Gao, Feng Han, Geoffrey I. N. Waterhouse, Yan Li, Lili Zhang
Summary: In this study, a highly selective catalyst was successfully developed for the catalytic oxidation of 5-hydroxymethylfurfural (HMF) to 5-formyl-2-furanic acid (FFCA) in alkaline media. The catalyst was prepared by ultrasonic intercalation of copper-iron layered double hydroxide (CuFe-LDH) platelets with an iron phthalocyanine (FePc) complex. The optimized testing conditions yielded a high HMF conversion of 85% with a FFCA selectivity of 81.8%. Furthermore, the catalyst exhibited excellent stability over multiple testing cycles.
CATALYSIS COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Quanbin Fu, Tingting Zhang, Xin Sun, Shikai Zhang, Geoffrey I. N. Waterhouse, Chuan Sun, Houshen Li, Shiyun Ai
Summary: A pyridine-based covalent organic framework (Pyridine-COF) was synthesized and demonstrated high selectivity and adsorption capacity for mercury ions. The framework showed good reusability and mainly relied on chelation for adsorption.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yuanjie Zheng, Peng Wang, Wei-Hsiang Huang, Chi-Liang Chen, Yanyan Jia, Sheng Dai, Tan Li, Yun Zhao, Yongcai Qiu, Geoffrey I. N. Waterhouse, Guangxu Chen
Summary: Electrochemical production of H2O2 is an eco-friendly and cost-effective method. Metal-doped carbon-based catalysts are commonly used for 2e-ORR due to their high selectivity. The role of metals and carbon defects in H2O2 production is still unclear. This study obtained a Co-N/O-C catalyst with a Faradaic efficiency greater than 90% in alkaline electrolyte by varying the Co loading in the pyrolysis precursor. Detailed studies revealed that carbon atoms in C-O-C groups at defect sites were the active sites for 2e-ORR in the Co-N/O-C catalysts. The direct contribution of cobalt single atom sites and metallic Co for the 2e-ORR performance was negligible, but Co played an important role in the pyrolytic synthesis of the catalyst.
Article
Chemistry, Analytical
Yongfeng Chen, Yufeng Sun, Geoffrey I. N. Waterhouse, Huiju Gao, Zhixiang Xu
Summary: In this study, a highly selective molecularly imprinted gel (MIG)-based electrochemical sensor was developed for simultaneous detection of vanillin (VAN) and tartrazine (TZ) in foods. The sensor showed a linear response over the concentration range of 0.03-125 mu M, with detection limits of 0.006 mu M and 0.005 mu M for VAN and TZ, respectively. The developed sensor demonstrated excellent recoveries (92.2%-109.7%) when applied to analyze liqueur, white vinegar, and vanilla ice cream samples spiked with VAN and TZ.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Engineering, Environmental
Yanan Chong, Tingyu Chen, Yifei Li, Jiajin Lin, Wei-Hsiang Huang, Chi-Liang Chen, Xiaojing Jin, Mingli Fu, Yun Zhao, Guangxu Chen, Jiake Wei, Yongcai Qiu, Geoffrey I. N. Waterhouse, Daiqi Ye, Zhang Lin, Lin Guo
Summary: Enhancing oxygen activation through defect engineering is an effective strategy for boosting catalytic oxidation performance. The study demonstrates that quenching is an effective strategy for preparing defect-rich Pt/metal oxide catalysts with superior catalytic oxidation activity. The quenching process creates abundant lattice defects and lattice dislocations in the support, promoting stronger electronic interactions between Pt species and the support, leading to higher oxidation Pt species generation for modulating the adsorption/desorption behavior of reactants.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Lin Ai, Yifei Pei, Ziqi Song, Xue Yong, Haoqiang Song, Gongjie Liu, Mingjun Nie, Geoffrey I. N. Waterhouse, Xiaobing Yan, Siyu Lu
Summary: Flexible carbon dot ribbons with excellent optical, electrical and semiconducting properties have been synthesized through efficient packing of individual carbon dots. These ribbons show outstanding stability and fast optoelectronic responses, making them ideal active layer materials for transparent flexible memristors with rapid Chinese character learning capability. This work lays the foundation for wearable artificial intelligence.
Article
Chemistry, Applied
Li Zhang, Ximo Wang, Chen Chen, Ruiqiang Wang, Xuguang Qiao, Geoffrey I. N. Waterhouse, Zhixiang Xu
Summary: A simple and sensitive SERS sensor based on gold nano-stars@reduced graphene oxide (AuNS@rGO) was developed for the detection of benzo[a]pyrene in foods. Benzo[a]pyrene was adsorbed on reduced graphene oxide and detected using SERS, with the large electric fields generated by the gold nanostars greatly amplifying the Raman signals. The SERS sensor exhibited a wide linear detection range and a low limit of detection. Chicken samples spiked with benzo[a]pyrene were successfully assayed using the sensor.
Article
Chemistry, Applied
Shikai Zhang, Xinxin Cheng, Quanbin Fu, Yijing Li, Peng Wu, Yiheng Qiao, Jianfeng Yan, Lin Si, Geoffrey I. N. Waterhouse, Houshen Li, Shiyun Ai
Summary: In this study, pectin-lignin nanoparticle (LNP) composite films were prepared and their physical, antioxidant, and antibacterial properties were evaluated. The addition of LNP enhanced the tensile strength, water contact angle, hydrophobicity, and water barrier properties of the pectin-based films. The tight entanglement and positive interaction between pectin and LNP contributed to the improved film properties. Additionally, the pectin-LNP composite films exhibited strong anti-ultraviolet performance and enhanced DPPH radical scavenging and antibacterial abilities. These results highlight the potential of pectin-LNP composite films as active packaging materials for food preservation/packaging applications.
FOOD HYDROCOLLOIDS
(2023)
Article
Chemistry, Multidisciplinary
Mengjie Hao, Yinghui Xie, Xiaolu Liu, Zhongshan Chen, Geoffrey I. N. Waterhouse, Hui Yang, Shengqian Ma, Xiangke Wang
Summary: Covalent organic frameworks (COFs) with photocatalytic linkers were designed for uranium extraction from seawater. A COF-based adsorption-photocatalysis strategy was developed for selective removal of uranyl from seawater without sacrificial reagents. The quaternary COF showed high uranium uptake capacity and good anti-biofouling abilities, opening the pathway for economic and efficient extraction of uranium from the oceans.
Article
Chemistry, Multidisciplinary
Changchun Ye, Zhenghui Pan, Qinghua Zhang, Fang Yin, Yanan Wang, Yifei Li, Guangxu Chen, Jia Li, Yongcai Qiu, Geoffrey I. N. Waterhouse, Lin Gu, Zhang Lin, Lin Guo
Summary: A facile synthesis route for heterostructured metal oxides via quenching-induced structural transformation was developed. Multiple quenching triggered the transformation from NiMoO4 to NiFe2O4, creating a novel heterostructure, and the pre-quenching generated disordered defect structure can promote subsequent quenching regulation.
ENERGY & ENVIRONMENTAL SCIENCE
(2024)
Review
Chemistry, Multidisciplinary
Xin Yang, Geoffrey I. N. Waterhouse, Siyu Lu, Jihong Yu
Summary: Afterglow materials with distinctive and long-lived optical emission properties have attracted widespread attention. Recent research has discovered many new afterglow materials with high photoluminescence quantum yields and long lifetimes. Organic-inorganic hybrid afterglow materials utilize the advantages of organic molecules and heavy atom dopants to achieve excellent performance and have the advantages of low manufacturing costs, diverse structures and optical properties.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Biophysics
Yongfeng Chen, Yufeng Sun, Xiaomin Pang, Ruiqiang Wang, Geoffrey I. N. Waterhouse, Zhixiang Xu
Summary: In this study, a novel dual-network magnetic conductive hydrogel was synthesized for the highly sensitive and rapid detection of the synthetic pigment Ponceau 4R in foods. The hydrogel showed improved adsorption capacity and electrical conductivity, and was successfully applied to the creation of an electrochemical sensor for Ponceau 4R detection.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Applied
Yuyi Du, Shikai Zhang, Geoffrey I. N. Waterhouse, Tao Zhou, Fangzhou Xu, Ranran Wang, Dongxiao Sun-Waterhouse, Peng Wu
Summary: Sustainable innovation aims to find more energy-efficient processes for producing highly demanded products from industrial by-products. This study compares two processes for extracting pectins from citrus peel and finds that using high-intensity pulsed electric field (HIPEF) pretreatment can increase pectin yield and production efficiency while reducing energy consumption.
FOOD HYDROCOLLOIDS
(2024)
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
