CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Jianian Hu,Guoqiang Luo,Jian Zhang,Yi Sun,Qiang Shen,Lianmeng Zhang
TaC/SiC composites with 5 wt% SiC addition were densified by plasma-activated sintering (PAS) at 1500–1800 °C for 5 min under 30 MPa. The effects of plasma-activated sintering on microstructures, densification and mechanical properties of the composites were investigated. The results showed that TaC/SiC composites achieved a relative density more than 99% of the theoretical density at 1600 °C. A low eutectic liquid phase generated by the oxide on the particle surface was observed in the composite to realize a relatively low temperature sintering densification. While the TaC particle size decreased insignificantly with increasing sintering temperature, the transformation of morphology of SiC particles changing from equiaxed to elongated grain was activated, accompanying with a slight particle size decreasing of the SiC phase, thus promoting a relatively high flexural strength of 550 MPa under 1800 °C. Besides, some ultra-fine 2 nm Ta 2 Si was observed in the glassy pockets, strengthening the amorphous phase and thus increasing the flexural strength.
研究领域:
材料科学
·
机械工程
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DOI
高影响因子
METALS AND MATERIALS INTERNATIONAL
·
2024
·
IF 3.3
Liang Jing,Jin Shipeng,Lv Nanying,Wang Cong,Yin Xiuyuan,Chen Suiyuan,Liu Changsheng
Ti 2 AlNb-based coatings with different TaC additions (0, 1.25, 2.5 and 5 at%) were prepared on Ti-6Al-4 V alloy to improve its surface properties by laser cladding. The effects of TaC addition on the morphology, microstructure transformation and mechanical properties of the laser cladding TiC/Ti 2 AlNb coatings were studied. The results showed that the TiC/Ti 2 AlNb coatings mainly composed of matrix B2 phase, layered O phase and a small amount of TiC. In situ formed TiC effectively refined the microstructure of the coatings. When the TaC addition increased from 0 to 5 at%, with the amount of in situ formed TiC increased from 0 to 20%, the grain size of B2 decreased from ~ 400 μm to ~ 50 μm, and the grain size of O phase decreased from ~ 3 μm to ~ 1 μm. The microhardness and wear resistance of TiC/Ti 2 AlNb based coatings improved when the TaC addition increased from 0 to 2.5 at%. The average microhardness for the sample with 2.5 at% TaC addition (602.18 HV 0.5 ) was 1.06 times that of the sample without TaC (568.36 HV 0.5 ), while the wear mass loss (16.28 mg) at 25 ℃ was only 43.4% that of the sample without TaC (37.50 mg). When the samples worn at 400 ℃ and 800 ℃ for 45 min, the wear mass losses of the sample with 2.5 at% TaC addition were only 15.13 mg and 13.50 mg, which were 50.9% and 51.5% these of the sample without TaC addition, respectively. The wear mass loss of sample with 5 at%TaC addition increased up to 16.04 mg and 16.4 mg, which means the large amount coarse TiC (dendrites) and the decrease of O phase fraction lowed the wear resistance of the TiC/Ti 2 AlNb coatings, though it still less than that of the Ti 2 AlNb coating (29.68 mg and 26.2 mg). Graphical Abstract
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Lulu Cui,Houshen Li,Weijie Shi,Yingying Jing,Shuhong Sun,Shiyun Ai,Zeyi Guo
Reducing the size of active species is a powerful means to improve the utilization rate of active metals and enhance the properties of bimetallic nanozymes. In this work, Fe was introduced into Ce-MOF through the coordination of Fe 3+ and organic ligands, and the coordination effect resulted in atomically dispersed Fe in the derived Fe/CeO 2 nanozyme. Due to the atomically dispersed Fe embedded in the lattice of CeO 2 , a large number of defect sites were generated, endowing the nanozyme with excellent peroxidase (POD)-like activity. The constructed total antioxidant capacity (TAC) sensor based on the POD-like activity of Fe 1.01 /CeO 2 nanozyme displayed a very wide linear concentration range for AA, Cys, Glu and Trolox. More importantly, this TAC sensor can be applied to the TAC detection in vitamin C tablets and beverages. This work provides theoretical guidance for the synthesis of high-performance bimetallic nanozymes for TAC detection.
研究领域:
材料科学
·
生物医学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Wenhao Du,Fanhao Zeng,Yafang Gao,Ziwei Wang,Meiyan Chen,Zhi Li
Increasing the high-temperature anti-oxidation time of Carbon/carbon(C/C) composites faces significant challenges for conventional coatings. Herein, a unique bi-layer coating of HfC-TaC-B 4 C-SiC(HTBS)/ZrSiO 4 -glass(ZA) was proposed and prepared through slurry sintering method, and their oxidation behavior and mechanism were investigated. The results show that after oxidation at 1673 K in air for 750.5 h, the mass loss of the coated C/C was only 3.48% with about 720 h of weight gain oxidation, indicating that the anti-oxidation time has increased by two or three times compared to traditional coatings. The improved oxygen resistance performance was mainly attributed to the hinder layer of Si/Hf-Ta-Si-O during oxidation, which grew with the simultaneous carbothermal reduction reaction of SiO near matrix and oxidation reaction of HTBS. This is beneficial to lowering the thermal mismatch of coating system, reducing the connected thermal stress cracks as oxygen permeation channels. Our findings provide a new insight on improving the long-time thermal protection performance of C/C composites.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED RADIATION AND ISOTOPES
·
2022
·
IF 1.787
Yunyun Bao,Yan Liu,Changfu Wang,Yun Wang,Dingzhong Yuan,Jianda Xu,Zuqing Zhu,Yan He,Jinbiao Liu
The adsorption and recovery of uranium from wastewater is of positive significance to the development of nuclear industry and environmental remediation. The ternary polymer (PZS-co-TA) was prepared from hexachlorocyclotriphosphazene (HCCP), 4,4-sulfonyldiphenol (BPS) and tannic acid (TA) under ultrasonic . TAC was then obtained after carbonization under high temperature from PZS-co-TA. The structure and performance of TAC were analyzed using SEM , EDS, FT-IR, XRD, Raman, BET and TG. The adsorption capacity of TAC for uranium under different static adsorption conditions was investigated. The adsorption process was more consistent with pseudo-second-order model. The maximum adsorption capacity calculated by non-linear Langmuir model was 492.5 mg/g at pH 5.5. The thermodynamic values suggested that the adsorption process was spontaneous and endothermic. Moreover, after five cycles of adsorption-desorption tests, TAC remained effective at adsorbing uranium, implying the introducing of TA to the precursor (PZS-co-TA) could enhance the adsorption capacity for uranium.
研究领域:
环境科学
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材料科学
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核工程
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Shanshan Huang,Xujuan Lv,Yuwei Zhang,Juan Wang,Xueji Zhang,Daoqing Fan
The level alterations of antioxidants are highly associated with various oxidative stress-related diseases, food quality and drug safety problems, which enables the reliable and accurate determination of total antioxidant capacity (TAC) become progressively significant. Herein, for the first time, we explored the catalytic effect of MnSiO 3 nanozyme with oxidase-like activity towards different fluorescent substrates, and introduced ratiometric fluorescence to MnSiO 3 -based biosensing. By harnessing MnSiO 3 -propelled catalytic oxidation of two fluorescent substrates with contrary responses (Scopoletin, SC and o-phenylenediamine, OPD), we constructed a facile, cost-effective ratiometric fluorescent (RF) platform for TAC measurement. In the absence of antioxidants, SC and OPD can be oxidized, and the synergistic effect of fluorescence resonance energy transfer (FRET) and inner-filter-effect (IFE) between SC and oxidized OPD (Ox-OPD) will result in the weak fluorescence of Ox-SC at 465 nm and the strong one of Ox-OPD at 562 nm, respectively. However, the addition of antioxidants will dissociate MnSiO 3 , generating the recovered high/low fluorescence values of both substrates. Through monitoring the FI 465 /FI 562 changes, the RF analysis of different antioxidants (Cys, AA, GSH) with satisfactory sensitivity is performed and the TAC measurements in diverse real samples (human serums, beverages, and drugs) are successfully accomplished. Moreover, the system demonstrates high selectivity and could compete with the commercial TAC test kits.
研究领域:
分析化学
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纳米技术
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生物化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Honglei Wang,Chuhan Sun,Xingui Zhou,Jinshan Yu
Tantalum carbide (TaC) matrix composites are widely used in aerospace thermal protection systems due to their high melting point and excellent thermal shock resistance. In the precursor infiltration and pyrolysis (PIP) process, the TaC precursor plays a critical role in the fabrication of the composites. However, conventional tantalum alkoxide precursors often suffer from insufficient crosslinking sites and lack of molecular-level mixing between the Ta and C sources. To address these issues, this study synthesized an unsaturated TaC precursor using tantalum pentachloride (TaCl 5 ) and 3-buten-1-ol as reactants, with allyl novolac resin (AN) introduced as the carbon source. The C=C bonds in the structure acted as active crosslinking centers during copolymerization, leading to the formation of a densely cross-linked network in the PTC-Butene precursor. Using PTC-Butene solution as the precursor and 30 vol% carbon fiber felt as the reinforcement, C f /TaC composites were successfully fabricated by PIP process. The composites were subjected to oxyacetylene ablation tests for 10, 60 and 120 s, and the ablation mechanisms were systematically investigated. Results show that during ablation, a molten Ta 2 O 5 layer formed on the surface, which acted as a barrier against oxygen diffusion. However, this oxide layer was continuously eroded by the high-speed gas flow. Carbon fibers helped alleviate thermal stress and suppress matrix cracking, yet inherent pores within the composites and channels left after fiber oxidation provided pathways for oxygen infiltration.
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Faqiang Shi,Limeng Liu,Jiandong Wu,Junfeng Hou,Yujin Wang
TaC x (x = 0.5, 0.55, 0.6 and 0.7) ceramics with 20 mol% Al addition were prepared by hot pressing TaC, Ta and Al powder mixtures. Effects of the overall C:Ta ratios and the Al addition on constituent phases, microstructures and mechanical properties of the consolidated materials were examined. Results showed that O impurity contained in the starting powders was collected in form of Al 2 O 3 due to strong affinity of O with Al. The TaC x -Al composites were easy to densify due to presence of molten Al at its melting point ( T m = 660 °C) and a transient Al–Ta eutectic liquid at higher temperatures. After densification, the metallic liquids were eliminated ultimately by formation of refractory Ta 4 AlC 3 via reaction of Al, Ta and TaC. Reactions between the remnant Ta and TaC after Ta 4 AlC 3 formation resulted in ζ-Ta 4 C 3-z or h-Ta 2 C depending on the initial C:Ta ratio. The Ta 4 AlC 3 compound was compatible with the tantalum carbides. Microstructures of the TaC x -Al (x = 0.5–0.7) composites were consisted of ζ-Ta 4 C 3-z and Ta 4 AlC 3 fine lamellar grains to benefit the mechanical properties of the composites. The TaC 0.7 –20mol% Al composition had satisfying mechanical properties (flexural strength 613 ± 28 MPa and fracture toughness 11.2 ± 0.8 MPa m 1/2 ). TG-DSC evidenced an increase in oxidation resistance of the TaC x ceramics by the addition of 20 mol% Al.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Lianbing Zhong,Limeng Liu,Guihong Geng,Yujin Wang,Feng Ye
Tantalum carbide ceramics containing 0.25–3.40 wt% Al as densifying aid were prepared by hot pressing at 1900 °C under 30 MPa for 60 min. Effects of Al addition on densification, phase composition, microstructure and mechanical properties of the TaC-Al ceramics were investigated. Al was an effective oxygen getter which reacted with volatile oxygen impurities such as Ta 2 O 5 on surfaces of TaC particles to form non-volatile minor phase of Al 2 O 3 , thus slowed TaC grain growth via inhibiting the non-densifying matter transport by evaporation-condensation. When Al content was larger than the value that was needed for complete impurity reaction of 10Al + 3Ta 2 O 5 = 6Ta + 5Al 2 O 3 , presence of Al liquid at high temperatures improved densification of the TaC-Al ceramics because Al liquid spread along the grain boundaries and wet the TaC grains. The TaC ceramic with 0.75, 1.50 and 3.40 wt% Al addition reached a relative density value of 91.6, 97.5 and 100%, respectively, with a similar average grain size of 3.5–4.8 μm. Fe impurity dissolved in Al and formed Al 6 Fe; slight reaction of Al with TaC formed a thin layer of Ta-Al-C compound around TaC grains. The TaC ceramic with 1.50–3.40 wt% Al additions showed good Vickers hardness , Young's modulus and flexural strength in the range of 12.4–13.2 GPa, 413–479 GPa and 532–673 MPa, respectively. Increase in oxidation resistance of TaC ceramics was observed at 600 °C in air with a few percentages of Al additions.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2013
·
IF 1.858
Hai-hua Chen,Yan Bi,Ho-kwang Mao,Ji-an Xu,Lei Liu,Qiu-min Jing,Zuo Li,Xiang-rong Chen,Qi-ming Wang
High-pressure strength and plastic properties of nanocrystalline tantalum carbide (nano-TaC) have been investigated by using synchrotron radiation up to 65.5 GPa. Nano-TaC shows a bulk modulus of K 0 = 433 ± 7 GPa with K ′ 0 fixed at 4.0. It is close to that of diamond and is higher than the results from micron-TaC. In its plastic deformation behavior, nano-TaC starts to yield a plastic deformation at around 20 GPa, and the yield strength of nano-TaC increases with pressures and reaches a value of ~ 22 GPa at the highest pressure in our test. The high-pressure strength of nano-TaC is comparable to that of other superhard metals such as B 6 O, c-BC 2 N and γ -Si 3 N 4 . The first-principle DFT calculations confirm a lower bulk modulus for micron-TaC.
研究领域:
材料科学
·
高压物理
·
陶瓷材料
·
力学性能
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR AND CELLULAR CARDIOLOGY
·
2024
·
IF 4.9
Xinjian Wang,Shuxian Han,Jinxiu Liang,Chen Xu,Ranran Cao,Shuoyang Liu,Yi Luan,Ying Gu,Peidong Han
Background Exosomes released by cardiomyocytes are essential mediators of intercellular communications within the heart, and various exosomal proteins and miRNAs are associated with cardiovascular diseases. However, whether the endosomal sorting complex required for transport (ESCRT) and its key component Alix is required for exosome biogenesis within cardiomyocyte remains poorly understood. Methods Super-resolution imaging was performed to investigate the subcellular location of Alix and multivesicular body (MVB) in primary cardiomyocytes. Cardiomyocyte-specific Alix-knockout mice were generated using AAV9/CRISPR/Cas9-mediated in vivo gene editing. A stable Alix-knockdown H9c2 cardiomyocyte line was constructed through lentiviral-mediated delivery of short hairpin RNA. In order to determine the role of Alix in controlling exosome biogenesis, exosomes from cardiomyocyte-specific Alix-knockout mice plasma and Alix-knockdown H9c2 culture medium were isolated and examined by western blot, NTA analysis and transmission electron microscopy. Biochemical and immunofluorescence analysis were performed to determine the role of ESCRT machinery in regulating MVB formation. Lastly, transverse aortic constriction (TAC)-induced cardiac pressure overload model was established to further explore the role of Alix-mediated exosome biogenesis under stress conditions. Results A significant proportion of Alix localized to the MVB membrane within cardiomyocytes. Genetic deletion of Alix in murine heart resulted in a reduction of plasma exosome content without affecting cardiac structure or contractile function. Consistently, the downregulation of Alix in H9c2 cardiomyocyte line also suppressed the biogenesis of exosomes. We found the defective ESCRT machinery and suppressed MVB formation upon Alix depletion caused compromised exosome biogenesis. Remarkably, TAC-induced cardiac pressure overload led to increased Alix, MVB levels, and elevated plasma exosome content, which could be totally abolished by Alix deletion. Conclusion These results establish Alix as an essential and stress-sensitive regulator of cardiac exosome biogenesis and the findings may yield valuable therapeutic implications.
研究领域:
心血管生物学
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分子生物学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materiomics
·
2023
·Vol. 9
·期 5
·984-991
·
IF 9.4
Zheng Fan,JiSheng Liang,Jun-Liang Chen,Ying Peng,Huajun Lai,Jian Nong,Chengyan Liu,Wangyang Ding,Lei Miao
SiGe is recognised as an excellent thermoelectric material with superior mechanical properties and thermal stability in regions with high temperatures. This study explores a novel strategy for co-regulating thermoelectric transport parameters to achieve high thermoelectric properties of p-type SiGe in the mid-temperature region by incorporating nano-TaC into SiGe combined ball milling with spark plasma sintering. By optimizing the amount of TaC in the SiGe matrix, the power factors were significantly increased due to the modulation doping effect based on the work function matching of SiGe with TaC. Simultaneously, the ensemble effect of the nanostructure leads to a significant decrease in thermal conductivity. Thus, a high ZT of 1.06 was accomplished at 873 K, which is 64 % higher than that of typical radioisotope thermoelectric generator. Our research offers a novel strategy for expanding and enhancing the thermoelectric properties of SiGe materials in the medium temperature range.
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DOI
高影响因子
危险品化学品经营许可证（带存储）