Materials
·
2025
·Vol. 18
·期 4
·744
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IF 3.2
Ya-Long Wang,Guo-Hua Zhang
Submicron-sized TiB2powders (300 nm–1 μm) were prepared by the reaction of TiC, B4C, and Ca assisted by molten CaCl2. The optimal reaction procedure (1200 °C and 25 wt.% CaCl2+ 25 wt.% Ca) was obtained by exploring the effects of the boronization reaction temperature and the addition of an amount of CaCl2. It was found that the introduction of CaCl2not only promoted the reaction but also effectively inhibited the volatilization of excess Ca. Furthermore, SEM images of the products showed that the morphology and particle size of TiB2were inherited from the carbothermal reduction product TiC, which was dominated by the “template/growth” mechanism. The process of the boronization reaction was that B atoms migrated from B4C and replaced the C atoms in the lattice of TiC.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fengyu Tian,Wenhong Wang,Bin Liu,Yuan Pan,Bin Dong,Yichuan Li,Yanpeng Li,Hailing Guo,Yongming Chai,Chenguang Liu
The future implementation of ultralow sulfur fuel regulations requires researchers to have an excellent understanding of the mechanism of the synergistic effect between the Co(Ni) and (Mo)W sulfides in supported Co(Ni)Mo(W)S hydrodesulfurization (HDS) catalysts. This synergistic effect occurs when the distance between two metals is on the mm or nm scale. To investigate the promotion of HDS on the µm scale, a series of Co and Mo multilayer flake catalysts with a thickness of 1 mm were prepared by laminate molding. The distance between CoS x and MoS 2 in these specially structured catalysts was adjustable on the µm scale by controlling the order and quality of the catalyst powder. The results for the HDS of dibenzothiophene (DBT) demonstrate that there is an obvious synergistic effect between CoS x and MoS 2 on the µm scale. The results of pyridine IR spectroscopy indicate that this synergy is due to CoS x and MoS 2 synergistically generating more coordinatively unsaturated sites (CUSs) and -SH active sites at the μm scale, thus increasing the HDS activity. Moreover, the catalyst activity increases as the distance between CoS x and MoS 2 decreases, and the fact that the feed comes into contact with CoS x first greatly improves the activity.
研究领域:
催化化学
·
能源材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Haiping Zhou,Gang Wang,Liping Wang,Zhenhua Zhang,Huiliang Hou,Qifan Zhong,Jin Xiao
Industrial alumina was used as raw material in the high-temperature calcination process, and AlF 3 was introduced to promote mass transfer in the gas phase. The calcination environment, such as sealing, calcination temperature, and holding time, was analyzed to enhance the effect of AlF 3 to promote the crystal growth of alumina. Here, round-like flake α-Al 2 O 3 with an average particle size (D50) of about 18–38 μm were obtained at low dosages (0.1–0.4 wt%) of AlF 3 . The morphology and particle size of α-Al 2 O 3 were further adjusted by introducing different types of micron-scaled nuclei as template inducers. Round-like flake and spherical-like large single crystals α-Al 2 O 3 with an average particle size greater than 35 μm were obtained, respectively, with 65 wt% of 15 μm flake and 10 μm bulk α-Al 2 O 3 nuclei added. In addition, the regulation mechanism of AlF 3 and nuclei on alumina crystal growth was also discussed. Finally, a theoretical basis and technical support for preparing high-performance, low-cost, and high thermal conductivity alumina fillers was provided.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Bioprinting
·
2022
·
IF 7.422
Shugang Hu,Zijie Meng,Junpeng Zhou,Yongwei Li,Yanwen Su,Qi Lei,Mao Mao,Xiaoli Qu,Jiankang He,Wei Wang
Micro/sub-microscale fibrillar architectures of extracellular matrix play important roles in regulating cellular behaviors such as attachment, migration, and differentiation. However, the interactions between cells and organized micro/sub-microscale fibers have not been fully clarified yet. Here, the responses of MC3T3-E1 cells to electrohydrodynamic (EHD) printed scaffolds with microscale and/or sub-microscale fibrillar architectures were investigated to demonstrate their potential for bone tissue regeneration. Fibrillar scaffolds were EHD-fabricated with microscale (20.51 ± 1.70 μm) and/or sub-microscale (0.58 ± 0.51 μm) fibers in a controlled manner. The in vitro results showed that cells exhibited a 1.25-fold increase in initial attached cell number and 1.17-fold increase in vinculin expression on scaffolds with micro/sub-microscale fibers than that on scaffolds with pure microscale fibers. After 14 days of culture, the cells expressed 1.23 folds increase in collagen type I (COL-I) deposition compared with that on scaffolds with pure microscale fibers. These findings indicated that the EHD printed sub-microscale fibrous architectures can facilitate attachment and COL I secretion of MC3T3-E1 cells, which may provide a new insight to the design and fabrication of fibrous scaffolds for bone tissue engineering.
研究领域:
生物医学工程
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组织工程
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Meng-Yue Gao,Qiao Chen,Wei Li,Ai-Guo Shen,Ji-Ming Hu
High-throughput optical labeling technologies have become increasingly important with the growing demands for molecular detection, disease diagnosis, and drug discovery. In this thought, a series of CN-bridged coordination polymer encapsulated gold nanoparticles have been developed as a universal and interference-free optical label through a facile and auxiliary agent-free self-assembly route. Moreover, surface-enhanced Raman scattering (SERS) emissions of CN-bridge can be tuned flexibly by simple replacement of Fe2+/Fe3+ with other metal ions relying on the synthesis of three Prussian blue analogues encapsulated gold nanoparticles (Au@PBA NPs). Thus, three distinct Raman frequencies have been acquired, which merely replaced the metal irons. On the basis of the potential supermultiplex optical label, space-confined surface-enhanced Raman scattering (SERS) emissions have been realized. Relying on “Abbe theorem”, the focused laser allows the pure and single triple bond-coded SERS emissions to be combined into a unique and independent output, so-called “combined SERS emission” (c-SERS), if the Au@PBA NPs were confined into one micrometer-scale object. This study demonstrated c-SERS may simultaneously provide 2n – 1 optical labels only using n single emissions in the Raman-silent region for micrometer-size objects.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Particuology
·
2023
·
IF 3.5
Peiyi Yan,Ying Zhang,Shili Zheng
Hydrolysis of TiCl 4 solution is capable of preparing microscale TiO 2 particles. This research studied the synthesis of microscale spherical TiO 2 powders and the hydrolysis kinetics. The effects of the flow field generated by different agitators and baffles in the crystallizer, the initial free acid concentration, the initial equivalent TiO 2 concentration, and the temperature on the hydrolysis progress and powder morphology were systematically studied. The results show that the flow field in a crystallizer can significantly affect the morphology and particle size of the powders, and the axial flow can improve the sphericity of the powders. The increased free HCl and equivalent TiO 2 concentrations in the pregnant solution inhibit the forward hydrolysis reaction, prolong the time to reach equilibrium, and reduce the yield. An appropriate temperature matching the compositions of the pregnant solution is crucial for the powder morphology and size. Powders with sizes ranging from around 5 μm–40 μm can be tuned under controlled flow field, solution compositions, and temperature conditions. In addition, the Cheng and Wunderlich modified Avrami equation was used for the crystallization kinetic modeling. The effects of the free HCl concentration, equivalent TiO 2 concentration, and hydrolysis temperature are reflected in the reaction rate constant and active nuclei reduction index. Increasing the free HCl and equivalent TiO 2 concentrations will reduce the reaction rate constant and accelerate the deactivation of the active nuclei, thus increasing the final powder size, while increasing the temperature will lead to the opposite results.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 10
·期 3
·835-843
·
IF 5.726
Yan Zhang,Shide Wu,Xia Xu,Heqing Jiang
Rapid deactivation by coke deposition is the main obstacle of ethane aromatization over Zn/ZSM-5. In this work, using the prepared nanosized Zn/HZSM-5, an almost threefold product yield and significantly improved stability were achieved in comparison with those of the microsized catalyst. XRD and XPS analyses indicated that a higher percentage of reactive [ZnOZn]2+ species was maintained during ethane aromatization over nano-Zn/HZSM-5 than micro-Zn/HZSM-5. In addition, the evolution of carbon deposits over nanosized and microsized Zn/ZSM-5 was investigated during prolonged ethane aromatization reaction using Raman spectroscopy and thermogravimetry measurements. Compared to the microsized catalyst, the nanosized zeolite facilitated the faster escape of light aromatics and the precursors of carbon deposits from the zeolite pores, thus suppressing the accumulation of coke deposits and improving the catalyst stability. Based on the nanosized Zn/HZSM-5, a protocol of isothermal reaction followed by regeneration was developed by periodically removing carbonaceous deposits, and an ∼25–35% product yield was achieved after 10 reaction–regeneration cycles.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
·
2023
·
IF 6.3
Zhaoqiang Zou,Jinkai Xu,Wanfei Ren,Manfei Wang,Zhenming Xu,Xue Wang,Hanhan Wei,Yan Huo,Huadong Yu
High-performance rectangular solid structures at the scale of 10–50 µm are extensively utilized in the fields of optical engineering and bioengineering . However, producing high-purity metallic rectangular solid structures efficiently and economically at the microscale remains an enormous challenge for most current techniques. Here, additives-induced localized electrodeposition micro additive manufacturing (LECD-µAM) technology was innovatively adopted to achieve high-efficiency, high-purity, and high-quality manufacturing of rectangular solid structures. It was found that the synergistic regulatory effect of the additives guides the electrodeposition process, induces the formation of nanotwins, and enhances the surface quality of the microstructures. The rectangular solid structure exclusively comprises copper and oxygen, devoid of any other elements, with a copper content exceeding 99.7%. The principle and mechanism of additives-induced LECD-µAM were deeply and thoroughly analysed, providing valuable theoretical guidance for further research on high-performance electrochemical additive manufacturing techniques. The novel strategy proposed in this study enables the development of new approaches for the preparation and investigation of various solid structures of different shapes.
研究领域:
光学工程
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生物工程
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 14
·16484-16495
·
IF 3.056
He Xingyu,Min Xiaobo,Peng Tianyu,Ke Yong,Zhao Feiping,Sillanpää Mika,Wang Yunyan
Ball-milling is considered as an economical and simple technology to produce novel engineered materials. The ball-milled microscale zero valent iron/pyrite composite (BM-ZVI/FeS 2 ) had been synthesized through ball-milling technology and applied for highly efficient sequestration of antimonate (Sb(V)) in aqueous solution. BM-ZVI/FeS 2 exhibited good Sb(V) removal efficiency (≥ 99.18%) at initial concentration less than 100 mg Sb(V)/L. Compared to ball-milled zero valent iron (ZVI) and pyrite (FeS 2 ), BM-ZVI/FeS 2 exhibited extremely higher removal efficiency due to the good synergistic adsorption effect. BM-ZVI/FeS 2 showed efficient removal performance at broad pH (2.6–10.6). Moreover, the coexisting anions had negligible inhibition influence on the Sb(V) removal. The antimony mine wastewater can be efficiently remediated by BM-ZVI/FeS 2 , and the residual Sb(V) concentrations (< 0.96 μg/L) can meet the mandatory discharge limit in drinking water (5 μg Sb/L). Experimental and model results demonstrated that endothermic reaction and chemisorption were involved in Sb(V) removal by BM-ZVI/FeS 2 . The XRD and XPS analyses confirmed that the complete corrosion of ZVI occurred on BM-ZVI/FeS 2 after Sb(V) adsorption, resulting in the enhanced Sb(V) sequestration. Mechanism analyses showed that the excellent removal performance of BM-ZVI/FeS 2 was ascribed to the high coverage of iron (hydr)oxide oxidized from ZVI. Because of the advantages of economical cost, high Sb(V) removal capacity and easy availability, BM-ZVI/FeS 2 offers a promising adsorbent for Sb(V) remediation.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhaoxiang Yang,Xu Yan,Beihang Xu,Zhenhao Wang,Yapei Wang
Patterning hydrogels on polymer surfaces is of great significance in widespread fields from bionic technology to materials science. Herein, a simple and universal writing/printing strategy for precisely patterning hydrogels on polymer surfaces with robust adhesion is reported. This strategy allows to construct surface patterns with discretionary shape and adjustable thickness of hydrogel coatings with micrometer resolution in a format that is convenient for large-scale manufacturing. The hydrogel pattern is formed by defining the region of the precursor solution, rather than the region that defines the initiator or UV, to avoid imprecise results due to initiator or thermal diffusion. Moreover, sufficient amounts of precursor solutions are widely distributed on the pretreated surfaces to minimize the effects of ambient oxygen and moisture. This strategy opens up new possibilities for the design and fabrication of new-generation surface-patterned soft materials. Based on our applicable demonstrations, the patterned hydrogel coatings show great potentials for multi-drug loaded skin patches, microreactors, and transparent ion sensors.
研究领域:
材料科学
·
仿生技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Sustainability
·
2024
·
IF 25.7
Liu Tao,Dong Tiantian,Wang Mengying,Du Xiaofan,Sun Youlong,Xu Gaojie,Zhang Huanrui,Dong Shanmu,Cui Guanglei
Silicon (Si) anode is widely viewed as a game changer for lithium-ion batteries (LIBs) due to its much higher capacity than the prevalent graphite and availability in sufficient quantity and quality. Most Si anode designs are nanostructured to overcome the large volume variation during cycling, but this comes at the expense of manufacturability, cost advantage and other merits. Here we demonstrate that micro-sized Si (μm-Si) recycled from photovoltaic waste can serve as anode material, exhibiting an average Coulombic efficiency of 99.94% and retaining 83.13% of its initial capacity after 200 cycles through the rational electrolyte design. With a formulated ether electrolyte of 3 M LiPF 6 in 1,3-dioxane (DX)/1,2-diethoxyethane (DEE), NCM811||μm-Si pouch cells survive 80 cycles and deliver an energy density of 340.7 Wh kg −1 even under harsh conditions. Responsible for the impressive electrochemical performance is a unique SEI chemistry where the flexible polymer-dominated outer layer well holds fractured Si particles together and the rigid Li 2 O/LiF-rich inner layer serves to facilitate ionic conduction and suppress side reactions. Our work not only suggests a more sustainable supply source for Si particles but also addresses the major problems facing μm-Si anode materials.
研究领域:
材料科学
·
能源存储
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaochen Li,Zihao Yang,Ying Peng,Fengfan Zhang,Meiqin Lin,Juan Zhang,Qichao Lv,Zhaoxia Dong
Efficient micron-sized droplet separation materials have become a new demand for environmental protection and economic development. However, existing separation methods are difficult to be effectively used for micron-sized water droplets surrounded by viscous oil, and common materials have difficulty maintaining hydrophilicity underoil. Here, inspired by the microstructure of tree xylem, we report a cellulose–polyurethane sponge (CP-Sponge) with wood-like pores and underoil superhydrophilicity using directional freeze-casting. The CP-Sponge has an excellent selective water absorption capacity underoil and compression resilience. This preparation strategy can flexibly control the sponge’s dimensional morphology. The designed cylindrical CP-Sponge can be easily installed in the silicone tube of a peristaltic pump. During pump operation, with a simple absorption, compression, and recovery process, the CP-Sponge continuously and effectively removes micron-sized water from crude oil and lubricating oil, reducing residual water in the oil to less than 2 ppm. The absorption-saturated sponge can be dried to continue recycling. Eco-friendly, recyclable, and sustainable artificial porous sponges provide new ideas and inspiration for the practical application of deep dehydration of viscous oils.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）