Effective disposal of radioactive waste is crucial for safe development of nuclear energy. In this study, flash sintering technology is used for the first time to quickly solidify simulated Sr-contaminated soil waste. The waste can be converted into a glass–ceramic phase by heating the waste at 1100 °C for 1 min during flash sintering. The phase evolution during flash sintering as a function of density and amorphous fraction was systematically investigated. Additionally, the microstructural evolution of the matrices and the leaching behavior of simulated waste elements (e.g., Sr) were evaluated. This study explores the feasibility of using flash sintering for treating radioactive contamination waste.
有效处置放射性废物对核能的安全发展至关重要。本研究首次采用闪速烧结技术来快速固化模拟锶污染土壤废物。在闪速烧结过程中，通过在 1100 °C 下加热 1 分钟，可将废料转化为玻璃陶瓷相。系统研究了闪速烧结过程中相的演变与密度和无定形部分的函数关系。此外，还评估了基质的微观结构演变和模拟废物元素（如锶）的浸出行为。这项研究探讨了利用闪速烧结处理放射性污染废物的可行性。
{"title":"Flash sintering glass–ceramic treatment of Sr-contaminated soil waste","authors":"Guilin Wei, Xiaoyan Shu, Jiahong Wang, Shibing Zuo, Kuan Wu, Guoliang Zhao, Fen Luo, Wenhong Han, Chen Xu, Xirui Lu","doi":"10.1016/j.ceramint.2024.10.136","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.136","url":null,"abstract":"Effective disposal of radioactive waste is crucial for safe development of nuclear energy. In this study, flash sintering technology is used for the first time to quickly solidify simulated Sr-contaminated soil waste. The waste can be converted into a glass–ceramic phase by heating the waste at 1100 °C for 1 min during flash sintering. The phase evolution during flash sintering as a function of density and amorphous fraction was systematically investigated. Additionally, the microstructural evolution of the matrices and the leaching behavior of simulated waste elements (e.g., Sr) were evaluated. This study explores the feasibility of using flash sintering for treating radioactive contamination waste.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"229 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.ceramint.2024.10.143
Rui Wang, Bo He, Dingwei Wang, Chengyu Jia, Jun Cao, Lei Shi, Jiaqi Pan, Guangtong Hai, Chaorong Li
A transparent device in perovskite HEO La(Mn0.2Cr0.2Fe0.2Co0.2Ni0.2)O3 modified Cu2Y2O5/CdIn2O4 is prepared via a simple approach of sol-gel method. The Cu2Y2O5/La(Mn0.2Cr0.2Fe0.2Co0.2Ni0.2)O3/CdIn2O4 exhibits high transparency of ∼85-90%, obvious photovoltaic conversion efficiency enhancement of ∼2.5×103-folds (PCE of ∼1.12%), and stable output in 5-months. This is mainly attributed to the La(Mn0.2Cr0.2Fe0.2Co0.2Ni0.2)O3 modification, as well as the appropriate Fermi level and high quantum yield. In this system, the La(Mn0.2Cr0.2Fe0.2Co0.2Ni0.2)O3 solid solution, with extra carrier injecting/driving from synergism of mixed transition metals charge compensation and lattice distortion, can improve the carrier kinetic equilibrium for PCE-transparency balance. Additionally, it can increase p-type conductivity through the synergism of Cu vacancy/interstitial oxygen. Moreover, the inorganic perovskite HEO La(Mn0.2Cr0.2Fe0.2Co0.2Ni0.2)O3 with modification stability is beneficial for the actual applications.
{"title":"Dual functional high entropy perovskite La(Mn0.2Cr0.2Fe0.2Co0.2Ni0.2)O3 interfacial transition layer modified Cu2Y2O5/CdIn2O4 transparent pn junction towards photovoltaic enhancement","authors":"Rui Wang, Bo He, Dingwei Wang, Chengyu Jia, Jun Cao, Lei Shi, Jiaqi Pan, Guangtong Hai, Chaorong Li","doi":"10.1016/j.ceramint.2024.10.143","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.143","url":null,"abstract":"A transparent device in perovskite HEO La(Mn<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Co<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub> modified Cu<sub>2</sub>Y<sub>2</sub>O<sub>5</sub>/CdIn<sub>2</sub>O<sub>4</sub> is prepared via a simple approach of sol-gel method. The Cu<sub>2</sub>Y<sub>2</sub>O<sub>5</sub>/La(Mn<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Co<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub>/CdIn<sub>2</sub>O<sub>4</sub> exhibits high transparency of ∼85-90%, obvious photovoltaic conversion efficiency enhancement of ∼2.5×10<sup>3</sup>-folds (PCE of ∼1.12%), and stable output in 5-months. This is mainly attributed to the La(Mn<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Co<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub> modification, as well as the appropriate Fermi level and high quantum yield. In this system, the La(Mn<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Co<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub> solid solution, with extra carrier injecting/driving from synergism of mixed transition metals charge compensation and lattice distortion, can improve the carrier kinetic equilibrium for PCE-transparency balance. Additionally, it can increase p-type conductivity through the synergism of Cu vacancy/interstitial oxygen. Moreover, the inorganic perovskite HEO La(Mn<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Co<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub> with modification stability is beneficial for the actual applications.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"2 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.ceramint.2024.10.155
Cheenepalli Nagarjuna, Sheetal Kumar Dewangan, K. Raja Rao, Man Mohan, Hansung Lee, Eunhyo Song, Byungmin Ahn
The present study reports the effect of TiO2 reinforcement on the phase, microstructure, mechanical and tribological properties of CrFeCuMnNi/TiO2 high entropy alloy composites (HEACs) processed by powder metallurgy. The results reveal the formation of single-phase face-centered cubic (FCC) structure after 30 h of milling in the original HEA, while TiO2 peaks in the HEACs indicate uniform distribution. After sintering, multiple phases including FCC, Cr-rich, Cr2O3 were observed. The hardness of HEAs increased from 330±10 to 440±10 HV and compressive yield strength increased from 480 to 760 MPa while scarifying the strain from 43.5 to 21 % with TiO2 content. The addition of TiO2 content slightly reduces the coefficient of friction and specific wear rate decreased by 45.16 % due to increased hardness and formation of stable oxide layer on the worn surface inhibits plastic deformation. The addition of TiO2 reduces the dominance of abrasive and adhesive wear and enhances the strength of HEACs.
{"title":"Strengthening of mechanical and tribological properties in CrFeCuMnNi high entropy alloy through dispersion of TiO2 reinforcement via powder metallurgy processes","authors":"Cheenepalli Nagarjuna, Sheetal Kumar Dewangan, K. Raja Rao, Man Mohan, Hansung Lee, Eunhyo Song, Byungmin Ahn","doi":"10.1016/j.ceramint.2024.10.155","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.155","url":null,"abstract":"The present study reports the effect of TiO<sub>2</sub> reinforcement on the phase, microstructure, mechanical and tribological properties of CrFeCuMnNi/TiO<sub>2</sub> high entropy alloy composites (HEACs) processed by powder metallurgy. The results reveal the formation of single-phase face-centered cubic (FCC) structure after 30 h of milling in the original HEA, while TiO<sub>2</sub> peaks in the HEACs indicate uniform distribution. After sintering, multiple phases including FCC, Cr-rich, Cr<sub>2</sub>O<sub>3</sub> were observed. The hardness of HEAs increased from 330±10 to 440±10 HV and compressive yield strength increased from 480 to 760 MPa while scarifying the strain from 43.5 to 21 % with TiO<sub>2</sub> content. The addition of TiO<sub>2</sub> content slightly reduces the coefficient of friction and specific wear rate decreased by 45.16 % due to increased hardness and formation of stable oxide layer on the worn surface inhibits plastic deformation. The addition of TiO<sub>2</sub> reduces the dominance of abrasive and adhesive wear and enhances the strength of HEACs.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"103 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CaO-Al2O3-SiO2 mixed powder and glass were used as the joining materials to join SiC ceramics by induction heating in a joining temperature range of 1400-1600°C under pressureless condition with heating and cooling rates of 100°C/min. The joint prepared with CaO-Al2O3-SiO2 mixed oxide powder as joining material has the highest shear strength of 60.09 ± 6.22 MPa at joining temperature of 1500°C, which contains triclinic CaAl2Si2O8 crystalline phase generated by chemical reaction in the holding process. In contrast, the joint produced with CaO-Al2O3-SiO2 glass powder at 1500°C also has the highest shear strength of 75. 76 ± 2.34 MPa, which contains hexagonal CaAl2Si2O8 and quartz generated through crystallization in the holding process due to rapid cooling rate of induction heating. In this study, the feature of mixed powder and glass joining by the induction heating technology was discussed to provide an effective and economic method for ceramic joining.
{"title":"Joining SiC ceramics with CaO-Al2O3-SiO2 mixed powder/glass based on induction heating","authors":"Xiu-Bing Chen, Lin-Lin Zhu, Chuang-Tian Zhan, Yu Tian, Wei-Ming Guo, Hua-Tay Lin","doi":"10.1016/j.ceramint.2024.10.154","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.154","url":null,"abstract":"CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> mixed powder and glass were used as the joining materials to join SiC ceramics by induction heating in a joining temperature range of 1400-1600°C under pressureless condition with heating and cooling rates of 100°C/min. The joint prepared with CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> mixed oxide powder as joining material has the highest shear strength of 60.09 ± 6.22 MPa at joining temperature of 1500°C, which contains triclinic CaAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub> crystalline phase generated by chemical reaction in the holding process. In contrast, the joint produced with CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> glass powder at 1500°C also has the highest shear strength of 75. 76 ± 2.34 MPa, which contains hexagonal CaAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub> and quartz generated through crystallization in the holding process due to rapid cooling rate of induction heating. In this study, the feature of mixed powder and glass joining by the induction heating technology was discussed to provide an effective and economic method for ceramic joining.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"52 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.ceramint.2024.10.132
Yu Fang, Liu Hong, Yang Dai, Qing Xiang, NianBing Zhang, Jiaojiao Li
The advancement and meticulous design of functional photocatalysts exhibiting exceptional photocatalytic redox activity represent a pivotal approach to mitigating the dual challenges of environmental pollution and energy scarcity. In this study, we elucidate the construction of a Bi2O2CO3 catalytic system capable of inhibiting oxidative electron transfer through the attenuation of homogeneous Bi0 particle formation, achieved through the judicious modulation of solvent ratios. This innovative architecture possesses a distinctive active site and enhances interfacial Bi-O electron transfer pathways via exposure to oxidized Bi3+. Upon photoexcitation, the Bi2O2CO3 catalytic system undergoes structural distortions in its excited state that facilitate forbidden radiative relaxation, thereby fostering long-lived charge separation states. Remarkable catalytic activity was demonstrated in the remediation of pollutants, encompassing auto-oxidation and the catalytic degradation of superoxide radicals (•O2-) and holes (h+). Notably, the effective degradation of tetracycline hydrochloride (TCH) in aqueous media reached an impressive 86% under simulated visible light irradiation, accompanied by a reaction rate constant 3.08 times superior to that of the 5-Bi/Bi2O2CO3 counterpart. Theoretical analyses revealed that the oxidized state of Bi2O2CO3 exhibits a crystal structure with significant electron trapping capability, undergoing pronounced apparent relaxation phenomena on its surface while demonstrating an enhanced adsorption affinity for H2O and O2. The potential degradation mechanisms were rigorously investigated through High-performance liquid chromatography (HPLC-MS), elucidating the photodegradation pathways and intermediates of TC. This work may serve as a distinct paradigm for the rational design of novel photocatalysts aimed at fostering sustainable environmental remediation and advancing energy innovation.
{"title":"Reconstruction of The Surface Bi3+ Oxide Layer on Bi2O2CO3: Facilitating Electron Transfer for Enhanced Photocatalytic Degradation Performance of Antibiotics in Water","authors":"Yu Fang, Liu Hong, Yang Dai, Qing Xiang, NianBing Zhang, Jiaojiao Li","doi":"10.1016/j.ceramint.2024.10.132","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.132","url":null,"abstract":"The advancement and meticulous design of functional photocatalysts exhibiting exceptional photocatalytic redox activity represent a pivotal approach to mitigating the dual challenges of environmental pollution and energy scarcity. In this study, we elucidate the construction of a Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub> catalytic system capable of inhibiting oxidative electron transfer through the attenuation of homogeneous Bi<sup>0</sup> particle formation, achieved through the judicious modulation of solvent ratios. This innovative architecture possesses a distinctive active site and enhances interfacial Bi-O electron transfer pathways via exposure to oxidized Bi<sup>3+</sup>. Upon photoexcitation, the Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub> catalytic system undergoes structural distortions in its excited state that facilitate forbidden radiative relaxation, thereby fostering long-lived charge separation states. Remarkable catalytic activity was demonstrated in the remediation of pollutants, encompassing auto-oxidation and the catalytic degradation of superoxide radicals (•O<sub>2</sub><sup>-</sup>) and holes (h<sup>+</sup>). Notably, the effective degradation of tetracycline hydrochloride (TCH) in aqueous media reached an impressive 86% under simulated visible light irradiation, accompanied by a reaction rate constant 3.08 times superior to that of the 5-Bi/Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub> counterpart. Theoretical analyses revealed that the oxidized state of Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub> exhibits a crystal structure with significant electron trapping capability, undergoing pronounced apparent relaxation phenomena on its surface while demonstrating an enhanced adsorption affinity for H<sub>2</sub>O and O<sub>2</sub>. The potential degradation mechanisms were rigorously investigated through High-performance liquid chromatography (HPLC-MS), elucidating the photodegradation pathways and intermediates of TC. This work may serve as a distinct paradigm for the rational design of novel photocatalysts aimed at fostering sustainable environmental remediation and advancing energy innovation.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"54 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.ceramint.2024.10.100
Jianghong Xu, Shu Liu, Sujuan Guo, Dan Guo, Jianyong Xiang, Fusheng Wen
Low density aerogels based on aramid nanofibers (ANFs) are promising candidate for microwave absorption materials. It is an arduous challenge to obtain lightweight microwave absorption materials with strong reflection loss (RL) and broad effective absorption bandwidth. In this paper, ANFs/FeCo hybrid aerogels were fabricated using ParaPhenylene TerephthalAmide (PPTA) as precursor via two-steps freeze-drying method, which offer three-dimensional network porous structure. ANFs/FeCo aerogel exhibited lightweight characteristic and excellent microwave absorption performance. The ultra-low density (14.35 mg cm-3) of ANFs/FeCo aerogel was lower than the one of CNTs. The improvement of microwave absorption performance of ANFs/FeCo aerogels can be attributed to the three-dimensional network porous structure of aerogels and the introduction of magnetic FeCo alloys nanoparticles which can induce a cooperative effect of proper impedance matching, conduction loss, polarization loss, magnetic loss, and multiple scatting. The RL and effective absorption bandwidth of ANFs/FeCo aerogels can be adjusted via changing the mass ration of ANFs and magnetic FeCo nanoparticles. ANFs/FeCo-3 aerogel exhibited ultra strong RL (-60.62 dB) and broad effective absorption bandwidth (4.8 GHz) under a thin thickness (1.75 mm). Our work can provide new insight into the design of lightweight microwave absorption material.
{"title":"Lightweight three-dimensional porous aramid nanofibers/magnetic alloy nanoparticles hybrid aerogel for high-performance microwave absorption","authors":"Jianghong Xu, Shu Liu, Sujuan Guo, Dan Guo, Jianyong Xiang, Fusheng Wen","doi":"10.1016/j.ceramint.2024.10.100","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.100","url":null,"abstract":"Low density aerogels based on aramid nanofibers (ANFs) are promising candidate for microwave absorption materials. It is an arduous challenge to obtain lightweight microwave absorption materials with strong reflection loss (<em>RL</em>) and broad effective absorption bandwidth. In this paper, ANFs/FeCo hybrid aerogels were fabricated using ParaPhenylene TerephthalAmide (PPTA) as precursor via two-steps freeze-drying method, which offer three-dimensional network porous structure. ANFs/FeCo aerogel exhibited lightweight characteristic and excellent microwave absorption performance. The ultra-low density (14.35 mg cm<sup>-3</sup>) of ANFs/FeCo aerogel was lower than the one of CNTs. The improvement of microwave absorption performance of ANFs/FeCo aerogels can be attributed to the three-dimensional network porous structure of aerogels and the introduction of magnetic FeCo alloys nanoparticles which can induce a cooperative effect of proper impedance matching, conduction loss, polarization loss, magnetic loss, and multiple scatting. The <em>RL</em> and effective absorption bandwidth of ANFs/FeCo aerogels can be adjusted via changing the mass ration of ANFs and magnetic FeCo nanoparticles. ANFs/FeCo-3 aerogel exhibited ultra strong <em>RL</em> (-60.62 dB) and broad effective absorption bandwidth (4.8 GHz) under a thin thickness (1.75 mm). Our work can provide new insight into the design of lightweight microwave absorption material.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"15 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.ceramint.2024.10.117
Sagarika Das, R.N.P. Choudhary
The present work mainly describes the fabrication and characterization (structural, micro-structural, dielectric, piezoelectric, optical, and energy-harvesting) of Ca1-xZnx(Fe0.5V0.5)O3 with x = 0, 0.05, 0.10, and 0.15 complex perovskite. All four compounds are prepared by using the solid-state reaction method (calcination temperature = 1100 ºC (6 h) and sintering temperature = 1150 ºC (7 h)). The room temperature XRD data analysis confirms all four compounds' single-phase orthorhombic structures. Different modes of vibrations are confirmed by Raman spectroscopy. The grain size increases from 1.09 μm to 2.53 μm with increased zinc concentration. The variation of dielectric constant with frequency has been explained based on Maxwell-Wagner polarization. The effects of grain and grain boundary have been confirmed by impedance spectroscopy, which contributes to the conduction and relaxation mechanism of the compounds. The d33, g33, and energy harvesting performance gradually increase with an increase in zinc concentration, confirming the enhancement of the compounds' piezoelectric properties. The decrease in the band gap from 3.58 eV (x = 0) to 3.00 eV (x = 0.15) confirms the enhancement of optical properties.
{"title":"Structural, dielectric, impedance, ferroelectric, piezoelectric, energy harvesting, and optical properties of Ca1-xZnx(Fe0.5V0.5)O3 ceramics","authors":"Sagarika Das, R.N.P. Choudhary","doi":"10.1016/j.ceramint.2024.10.117","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.117","url":null,"abstract":"The present work mainly describes the fabrication and characterization (structural, micro-structural, dielectric, piezoelectric, optical, and energy-harvesting) of Ca<sub>1-x</sub>Zn<sub>x</sub>(Fe<sub>0.5</sub>V<sub>0.5</sub>)O<sub>3</sub> with x = 0, 0.05, 0.10, and 0.15 complex perovskite. All four compounds are prepared by using the solid-state reaction method (calcination temperature = 1100 ºC (6 h) and sintering temperature = 1150 ºC (7 h)). The room temperature XRD data analysis confirms all four compounds' single-phase orthorhombic structures. Different modes of vibrations are confirmed by Raman spectroscopy. The grain size increases from 1.09 μm to 2.53 μm with increased zinc concentration. The variation of dielectric constant with frequency has been explained based on Maxwell-Wagner polarization. The effects of grain and grain boundary have been confirmed by impedance spectroscopy, which contributes to the conduction and relaxation mechanism of the compounds. The d<sub>33</sub>, g<sub>33</sub>, and energy harvesting performance gradually increase with an increase in zinc concentration, confirming the enhancement of the compounds' piezoelectric properties. The decrease in the band gap from 3.58 eV (x = 0) to 3.00 eV (x = 0.15) confirms the enhancement of optical properties.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"16 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.ceramint.2024.10.135
Devis Bellucci, Alessia Mazzilli, Andrea Martelli, Francesco Gerardo Mecca, Susanna Bonacorsi, Francesco Demetrio Lofaro, Federica Boraldi, Daniela Quaglino, Valeria Cannillo
Bioactive glasses (BGs) have emerged as invaluable resources for bone tissue engineering due to their remarkable properties such as bioactivity, resorbability, cell compatibility, and osteoconductivity. However, these materials exhibit certain limitations when subjected to high temperatures, for their tendency to crystallize, thus leading to diminished bioactivity, reduced mechanical strength, and altered dissolution kinetics. One promising approach to counteract this problem is to reduce the alkaline element content in BGs while simultaneously adding strontium and magnesium. Building on previous studies of Bio_MS, a recently developed experimental formulation, we investigated the contributions of strontium and magnesium to the thermal, mechanical, and biological properties of various bioactive glasses, including commercially available options. Differential thermal analysis, heating microscopy, X-ray diffractometry, environmental scanning electron microscopy, measurement of the Young’s modulus, simulated body fluid testing, cytotoxicity tests, cell viability, growth, adhesion and morphology were assessed through an integrated approach and compared for a complete evaluation of BGs, and of doped BGs, also undergoing thermal treatments. The results demonstrated improved thermal, mechanical and biological behaviors of the magnesium-strontium-doped BGs, thus paving the way for the development of BGs with enhanced biomedical perspectives.
{"title":"Enrichment of strontium and magnesium improves the physical, mechanical and biological properties of bioactive glasses undergoing thermal treatments: new cues for biomedical applications","authors":"Devis Bellucci, Alessia Mazzilli, Andrea Martelli, Francesco Gerardo Mecca, Susanna Bonacorsi, Francesco Demetrio Lofaro, Federica Boraldi, Daniela Quaglino, Valeria Cannillo","doi":"10.1016/j.ceramint.2024.10.135","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.135","url":null,"abstract":"Bioactive glasses (BGs) have emerged as invaluable resources for bone tissue engineering due to their remarkable properties such as bioactivity, resorbability, cell compatibility, and osteoconductivity. However, these materials exhibit certain limitations when subjected to high temperatures, for their tendency to crystallize, thus leading to diminished bioactivity, reduced mechanical strength, and altered dissolution kinetics. One promising approach to counteract this problem is to reduce the alkaline element content in BGs while simultaneously adding strontium and magnesium. Building on previous studies of Bio_MS, a recently developed experimental formulation, we investigated the contributions of strontium and magnesium to the thermal, mechanical, and biological properties of various bioactive glasses, including commercially available options. Differential thermal analysis, heating microscopy, X-ray diffractometry, environmental scanning electron microscopy, measurement of the Young’s modulus, simulated body fluid testing, cytotoxicity tests, cell viability, growth, adhesion and morphology were assessed through an integrated approach and compared for a complete evaluation of BGs, and of doped BGs, also undergoing thermal treatments. The results demonstrated improved thermal, mechanical and biological behaviors of the magnesium-strontium-doped BGs, thus paving the way for the development of BGs with enhanced biomedical perspectives.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"33 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.ceramint.2024.10.129
Shengtao Gao, Chuanlei Zhu, Yuanchun Zhang
Selenide-based functional composites materials demonstrated tunable dielectric properties and heterogeneous interface design, which has been widely studied in electromagnetic (EM) wave absorption field. Herein, Metal-organic frameworks (MOFs) derived carbon coating copper selenide (Cu2-XSe@C) composites were successfully fabricated by using the Cu-MOFs as precursor. After reacting with the gaseous Se in the selenization annealing process, the metal host was converted into the Cu2-XSe nanoparticles, where embodied in the carbon matrix transformed from the organic linker. Based on the tunning dielectric property and building heterogeneous interface, MOFs-derived Cu2-XSe@C composites displayed outstanding EM wave absorption performance. Though the conduction loss, interfacial and dipole polarization behaviors, the minimum reflection loss (RLmin) value of Cu2-XSe@C-600 composites reached to -74.3 dB at 11.7 GHz when the thickness is 2.0 mm. The efficient absorption bandwidth (EAB) can be regulated via controlling the applied thickness. When the thickness is 2.3 mm, above-mentioned Cu2-XSe@C-600 got the broadest absorption performance with the EAB of 5.5 GHz from the 7.7 to 13.2 GHz, covering the whole X-band. Therefore, MOFs-derived selenide-based composites shed a new design strategy for constructing broadband EM wave absorption, especially in radar stealth applications.
{"title":"MOFs-Derived Copper Selenides Nanoparticles Implanted in Carbon Matrix for Broadband Electromagnetic Wave Absorption","authors":"Shengtao Gao, Chuanlei Zhu, Yuanchun Zhang","doi":"10.1016/j.ceramint.2024.10.129","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.129","url":null,"abstract":"Selenide-based functional composites materials demonstrated tunable dielectric properties and heterogeneous interface design, which has been widely studied in electromagnetic (EM) wave absorption field. Herein, Metal-organic frameworks (MOFs) derived carbon coating copper selenide (Cu<sub>2-X</sub>Se@C) composites were successfully fabricated by using the Cu-MOFs as precursor. After reacting with the gaseous Se in the selenization annealing process, the metal host was converted into the Cu<sub>2-X</sub>Se nanoparticles, where embodied in the carbon matrix transformed from the organic linker. Based on the tunning dielectric property and building heterogeneous interface, MOFs-derived Cu<sub>2-X</sub>Se@C composites displayed outstanding EM wave absorption performance. Though the conduction loss, interfacial and dipole polarization behaviors, the minimum reflection loss (<em>RL</em><sub>min</sub>) value of Cu<sub>2-X</sub>Se@C-600 composites reached to -74.3 dB at 11.7 GHz when the thickness is 2.0 mm. The efficient absorption bandwidth (EAB) can be regulated via controlling the applied thickness. When the thickness is 2.3 mm, above-mentioned Cu<sub>2-X</sub>Se@C-600 got the broadest absorption performance with the EAB of 5.5 GHz from the 7.7 to 13.2 GHz, covering the whole X-band. Therefore, MOFs-derived selenide-based composites shed a new design strategy for constructing broadband EM wave absorption, especially in radar stealth applications.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"58 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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