Materials最新文献_第7页

Processing and Characterisation of Alumina/Eucryptite Nanostructured Composites.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-03 DOI: 10.3390/ma18030671

Jordana Mariot Inocente, Renata Bochanoski da Costa, Ana Sônia Mattos, Carmen Alcázar, Amparo Borrell, Rodrigo Moreno, Sabrina Arcaro, Oscar Rubem Klegues Montedo

{"title":"Processing and Characterisation of Alumina/Eucryptite Nanostructured Composites.","authors":"Jordana Mariot Inocente, Renata Bochanoski da Costa, Ana Sônia Mattos, Carmen Alcázar, Amparo Borrell, Rodrigo Moreno, Sabrina Arcaro, Oscar Rubem Klegues Montedo","doi":"10.3390/ma18030671","DOIUrl":"10.3390/ma18030671","url":null,"abstract":"Alumina is one of the most studied and used ceramic materials, but increasing its fracture toughness is still a challenge for many specific impact applications. Adding a second phase with a low coefficient of thermal expansion (CTE) to an alumina matrix can enhance the matrix's mechanical properties, reduce its sintering temperature, and increase its toughness by generating compressive stresses on the alumina particle surface. In this study, nanostructured alumina/eucryptite composites were prepared to achieve enhanced toughness. First, eucryptite (Li2O·Al2O3·2SiO2) nanoparticles were successfully synthesised via colloidal heterocoagulation. These nanoparticles were then used to reinforce alumina matrices through slip casting followed by conventional sintering. Complete crystallisation of eucryptite was achieved at 850 °C with a CTE of 0.46 × 10 -6 °C -¹. Transmission electron microscopy analysis revealed that the average particle size was 28.5 ± 14.5 nm. To achieve a relative density of 95.3%, the composite containing 5 vol.% eucryptite required sintering for 1 h at 1400 °C whereas pure alumina required 2 h at 1600 °C. This reduction in sintering temperature (by up to 200 °C) helped to improve the fracture toughness, with the alumina grain size decreasing from 2.3 to 0.9 µm. The advantages of the new composite are the more economically viable and environmentally friendly way of producing the lithium aluminosilicate nanoparticles, compared to the production of ceramic frits at high temperatures (~1500 °C).","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820179/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Non-Thermal Mechanisms in Microwave Sintering of Materials.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-03 DOI: 10.3390/ma18030668

Ming-Syun Lin, Kwo-Ray Chu

{"title":"On the Non-Thermal Mechanisms in Microwave Sintering of Materials.","authors":"Ming-Syun Lin, Kwo-Ray Chu","doi":"10.3390/ma18030668","DOIUrl":"10.3390/ma18030668","url":null,"abstract":"The microwave sintering of various materials is a promising technology, which has received much attention for its demonstrated potential. Both the conventional (furnace) and microwave sintering rely on thermal activation for particle bonding, for which a high temperature environment is essential. In comparison, microwave treatment achieves the same degree of densification as furnace sintering in a time shorter by a factor of two or higher and at a temperature lower by 5% to 15%. However, this is a phenomenon not yet fully understood and is commonly referred to as a non-thermal effect. Its understanding is a subject of both physics and practical interest. The non-thermal effect has been studied under years of research in order to broaden the applicability of microwave sintering. Here, we first present an overview of experimentally demonstrated advantages of microwave sintering. To facilitate further studies, we then review the literature and put together four commonly recognized interpretations of the non-thermal effects: the ponderomotive force-driven mass transport, magnetism-created cohesive forces, polarization charge-enhanced wave electric field, and polarization charge-induced attractive force among the sintered particles, with an emphasis on recent development.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820473/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insights into HKUST-1 Metal-Organic Framework's Morphology and Physicochemical Properties Induced by Changing the Copper(II) Salt Precursors.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-03 DOI: 10.3390/ma18030676

Joanna Klęba, Kun Zheng, Dorota Duraczyńska, Mateusz Marzec, Monika Fedyna, Jakub Mokrzycki

{"title":"Insights into HKUST-1 Metal-Organic Framework's Morphology and Physicochemical Properties Induced by Changing the Copper(II) Salt Precursors.","authors":"Joanna Klęba, Kun Zheng, Dorota Duraczyńska, Mateusz Marzec, Monika Fedyna, Jakub Mokrzycki","doi":"10.3390/ma18030676","DOIUrl":"10.3390/ma18030676","url":null,"abstract":"The HKUST-1 metal-organic framework was synthesized using four different copper(II) salt precursors, namely copper nitrate, copper sulphate, copper acetate, and copper chloride, via the solvothermal method with no mixing. Syntheses were conducted without using the N,N-dimethylformamide to allow for a greener synthesis of MOFs. The selected physicochemical properties of the obtained metal-organic frameworks were determined. The yield of the obtained products changed in the order acetate>nitrate>sulfate, while no product was obtained in the synthesis with copper(II) chloride. The obtained materials were characterized by means of XRD, nitrogen adsorption-desorption at -196 °C, FTIR, XPS, TGA, SEM, and DLS. The morphology of crystallites and their physicochemical properties were significantly affected when different copper(II) salt precursors were used. The comparison of the obtained results with already published works allows for the correlation of the synthesis parameters like synthesis temperature, time, mixing, and copper(II) salt precursor used on selected properties of the final product.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11819983/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced Hydrogen Evolution Reaction Using Biomass-Activated Carbon Nanosheets Derived from Eucalyptus Leaves.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-03 DOI: 10.3390/ma18030670

Sankar Sekar, Atsaya Shanmugam, Gokilapriya Senthilkumar, Kiruthiga Thangasami, Hyun Jung, Youngmin Lee, Sejoon Lee

引用次数: 0

Effects of Red Mud on Microstructures and Heat Resistance of ZL109 Aluminum Alloy.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-02 DOI: 10.3390/ma18030664

Zhuofang Huang, Anmin Li, Wendi Zhou, Jinjin Li, Jinkai Zhang

{"title":"Effects of Red Mud on Microstructures and Heat Resistance of ZL109 Aluminum Alloy.","authors":"Zhuofang Huang, Anmin Li, Wendi Zhou, Jinjin Li, Jinkai Zhang","doi":"10.3390/ma18030664","DOIUrl":"10.3390/ma18030664","url":null,"abstract":"The effects of red mud on the microstructures and high-temperature tensile properties of the ZL109 aluminum alloy have been investigated. Red mud/ZL109-based composite materials with added red mud (a major byproduct of the aluminum industry), which has been coated with nickel by chemical deposition, have been prepared through gravity casting. The results show that the addition of red mud promotes the alloy's microstructure and helps to uniformly distribute the eutectic silicon. It also increases the content of heat-resistant phases, such as the Q-Al5Cu2Mg8Si6 and γ-Al7Cu4Ni phases. These changes significantly enhance the alloy's high-temperature tensile properties. The alloy with 1% (wt.%) red mud exhibits the best tensile strength at both room temperature and 350 °C, reaching 295.4 MPa and 143.3 MPa, respectively. The alloy with 1.5% (wt.%) red mud demonstrates excellent performance at 400 °C, achieving a tensile strength of 86.2 MPa through the cut-through method and Orowan mechanism. As a reinforcing material, red mud not only improves the high-temperature resistance of the aluminum alloy but also provides a way to recycle industrial waste. This study offers a new way to address the red mud waste problem and helps develop high-performance, heat-resistant aluminum alloys. It shows the potential of these alloys in high-temperature applications.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820902/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabrication of Network Spherical α-Al₂O₃ and Its Application on the Separator of Lithium-Ion Batteries.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-02 DOI: 10.3390/ma18030660

Haiyang Chen, Huifang Zhang, Hongliang Huang, Mingjie Guo, Jiale Wang, Peng Wang, Bin Li, Junhong Chen

{"title":"Fabrication of Network Spherical α-Al2O3 and Its Application on the Separator of Lithium-Ion Batteries.","authors":"Haiyang Chen, Huifang Zhang, Hongliang Huang, Mingjie Guo, Jiale Wang, Peng Wang, Bin Li, Junhong Chen","doi":"10.3390/ma18030660","DOIUrl":"10.3390/ma18030660","url":null,"abstract":"Ceramic-coated polyolefin separator technology is considered a simple and effective method for the improvement of lithium-ion battery (LIB) safety. However, the characteristics of ceramic powder can adversely affect the surface structure and ion conductivity of the separators. Therefore, it is crucial to develop a ceramic powder that not only improves the thermal stability of the separators but also enhances ion conductivity. Herein, network spherical α-Al2O3 (N-Al2O3) with a multi-dimensional network pore structure was constructed. Furthermore, N-Al2O3 was applied as a coating to one side of polyethylene (PE) separators, resulting in N-Al2O3-PE separators that exhibit superior thermal stability and enhanced wettability with liquid electrolytes. Notably, the N-Al2O3-PE separators demonstrated exceptional ionic conductivity (0.632 mS cm-1), attributed to the internal multi-dimensional network pore structures of N-Al2O3, which facilitated an interconnected and efficient \"highway\" for the transport of Li+ ions. As a consequence, LiCoO2/Li half batteries equipped with these N-Al2O3-PE separators showcased remarkable rate and cycling performance. Particularly at high current densities, their discharge capacity and capacity retention rate significantly outperformed those of conventional PE separators.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820654/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First-Principles Understanding of Mono- and Dual-Emissions in AZnOS:Bi³⁺ (A = Ba, Ca) Phosphors.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-02 DOI: 10.3390/ma18030657

Quanzhi Kougong, Bibo Lou, Mikhail G Brik

{"title":"First-Principles Understanding of Mono- and Dual-Emissions in AZnOS:Bi3+ (A = Ba, Ca) Phosphors.","authors":"Quanzhi Kougong, Bibo Lou, Mikhail G Brik","doi":"10.3390/ma18030657","DOIUrl":"10.3390/ma18030657","url":null,"abstract":"The AZnOS:Bi3+ (A = Ba, Ca) phosphors exhibit mono- and dual-emission phenomena based on the different choices of cation, making them an ideal prototype for dual-emission mechanism studies of Bi3+ ions. Here, first-principles calculations were performed to investigate the site occupancy, defect levels, and luminescence properties of the AZnOS:Bi3+ systems. The formation energy calculations show that the bismuth dopants are mainly in the trivalent charge state, with the Bi3+ ions preferring the Ca sites in CaZnOS but the Zn sites in BaZnOS. Such cation-selective occupancy mainly results in the difference between the mono- and dual-emission phenomena in the two hosts. The excitation and emission energies predicted by calculations are in good agreement with the measurements. Our calculations show that the lowest excited state 3P0,1 provides the dominant emission in both CaZnOS:Bi3+ and BaZnOS:Bi3+ phosphors. In light of the experimental and theoretical results, the metastable excited state of Bi2+ + hVBM (hole at the valence band maximum) is the origin of the additional emission bands in BaZnOS:Bi3+. These results provide the basis of emission band tuning and novel material design for Bi3+-doped phosphors.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11819700/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling the Carbothermal Chlorination Mechanism of Titanium Dioxide in Molten Salt Using a Deep Neural Network Potential.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-02 DOI: 10.3390/ma18030659

Enhao Zhang, Xiumin Chen, Jie Zhou, Huapeng Wu, Yunmin Chen, Haiguang Huang, Jianjun Li, Qian Yang

{"title":"Modeling the Carbothermal Chlorination Mechanism of Titanium Dioxide in Molten Salt Using a Deep Neural Network Potential.","authors":"Enhao Zhang, Xiumin Chen, Jie Zhou, Huapeng Wu, Yunmin Chen, Haiguang Huang, Jianjun Li, Qian Yang","doi":"10.3390/ma18030659","DOIUrl":"10.3390/ma18030659","url":null,"abstract":"The molten salt chlorination method is one of the two main methods for producing titanium tetrachloride, an important intermediate product in the titanium industry. To effectively improve chlorination efficiency and reduce unnecessary waste salt generation, it is necessary to understand the mechanism of the molten salt chlorination reaction, and consequently this paper conducted studies on the carbon chlorination reaction mechanism in molten salts by combining ab initio molecular dynamics (AIMD) and deep potential molecular dynamics (DeePMD) methods. The use of DeePMD allowed for simulations on a larger spatial and longer time scale, overcoming the limitations of AIMD in fully observing complex reaction processes. The results comprehensively revealed the mechanism of titanium dioxide transforming into titanium tetrachloride. In addition, the presence form and conversion pathways of chlorine in the system were elucidated, and it was observed that chloride ions derived from NaCl can chlorinate titanium dioxide to yield titanium tetrachloride, which was validated through experimental studies. Self-diffusion coefficients of chloride ions in pure NaCl which were acquired by DeePMD showed good agreement with the experimental data.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820525/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143409039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of the Impact Resistance of Epoxy Prepregs Through the Incorporation of Polyamide Nonwoven Fabric.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-02 DOI: 10.3390/ma18030661

Anastasia Kondrateva, Oleg Morozov, Erdni Erdni-Goryaev, Ekaterina Afanaseva, Viktor Avdeev

引用次数: 0

Output Characteristics of Carbon Nanotube Thermoelectric Generator with Slitted Kirigami Structure.

IF 3.1 3区材料科学

Materials Pub Date : 2025-02-02 DOI: 10.3390/ma18030656

Shingo Terashima, Yuki Iwasa, Naoki Tanaka, Tsuyohiko Fujigaya, Eiji Iwase

{"title":"Output Characteristics of Carbon Nanotube Thermoelectric Generator with Slitted Kirigami Structure.","authors":"Shingo Terashima, Yuki Iwasa, Naoki Tanaka, Tsuyohiko Fujigaya, Eiji Iwase","doi":"10.3390/ma18030656","DOIUrl":"10.3390/ma18030656","url":null,"abstract":"The objective of our research is to improve the power generation of a thermoelectric generator (TEG) using a single-walled carbon nanotube (SWCNT) sheet by applying the out-of-plane deformation of a slitted kirigami structure. In order to obtain a large amount of power from a TEG using a thin-film thermoelectric (TE) element such as a SWCNT sheet, it is necessary to generate a large temperature difference in the in-plane direction of the thin-film TE element. However, it is difficult to realize a large temperature difference when the thin-film TE element is in contact with a heat source due to the need for a layer with high heat insulation. In this research, we proposed and fabricated a TEG with the out-of-plane deformation of a kirigami structure with slits using a p-n patterned SWCNT sheet as the thin-film TE material and evaluated the open circuit voltage with respect to the out-of-plane deformation and the number of TE elements. As a result, the output performance of SWCNT TEG was clarified when the out-of-plane deformation and the number of TE element pairs were varied.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11819729/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0