International Journal of Applied Ceramic Technology
·
2023
·Vol. 21
·期 1
·427-437
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IF 2.1
Yulong Wang,Zhoufu Wang,Xitang Wang,Hao Liu,Yan Ma,Pengcheng Jiang,Yunjie Dong,Jiwei Niu
Short carbon fiber is a promising candidate for reinforcing carbon-containing refractories at the macro scale due to its excellent high-temperature stability and mechanical properties. In this work, the microstructure evolution of short carbon fiber and the effect of its addition on the properties of Al 2 O 3 –C refractories are investigated. The results show that adding short carbon fiber could affect the distribution of in situ ceramic phases, combined with the cross-scale reinforcement effect, leading to high strength—the CMOR of short carbon fiber containing refractories could be 23.0% higher than the free ones, while the HMOR could be 22.0% higher. Furthermore, the results suggest that the short carbon fiber containing refractories treated at 1400°C possesses high resistance to the initiation of crack propagation, which could be attributed to the high bonding strength brought by carbon fiber. Noteworthy, adding short carbon fiber could improve thermal shock resistance. The short carbon fiber containing refractories treated at 1300°C could possess a higher residual strength ratio than free ones. For instance, the specimen containing 0.1 wt% short carbon fiber shows the highest residual strength ratio (87.7%).
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Foods
·
2023
·Vol. 12
·期 9
·1910
·
IF 5.2
Anqi Xie,Hao Wan,Lei Feng,Boyun Yang,Yiqun Wan
In this study,Anoectochilus formosanuspolysaccharide (AFP) was acquired a via water extraction and alcohol precipitation method. The immunoregulatory activity of AFP was first evaluated on cyclophosphamide (Cy)-treated mice. Galacturonic acid, glucose and galactose were confirmed to be the main components of AFP. AFP demonstrated the ability to stimulate the production of TNF-α and IL-6 in RAW 264.7 macrophages. Not surprisingly, the activation of the NF-κB signaling pathway by AFP was validated via Western blot analysis. Furthermore, AFP could alleviate Cy-induced immunosuppression, and significantly enhance the immunity of mice via increasing the thymus index and body weight, stimulating the production of cytokines (IgA, IgG, SIgA, IL-2, IL-6 and IFN-γ). The improvement in the intestinal morphology of immunosuppressed mice showed that AFP could alleviate Cy-induced immune toxicity. These results have raised the possibility that AFP may act as a natural immunomodulator. Overall, the study of AFP was innovative and of great significance for AFP’s further application and utilization.Keywords:Anoectochilus formosanus;polysaccharide;immunosuppression;bioactivities
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高影响因子
IONICS
·
2023
·Vol. 29
·期 6
·2405-2415
·
IF 2.8
Han Jia-Jun,Yin Ming-yu
At present, platinum-based alloys are irreplaceable catalysts for direct methanol fuel cells. How to reduce the amount of Pt and improve its electrocatalytic performance is one of the difficulties in this field. Noble-metal hollow nanocrystals are one of the most promising catalysts due to their high specific surface area and high stability. In this paper, we used the combination of electrochemical displacement reaction and Kirkendal effect to prepare hollow NiPt/C by sacrificial template method, and explore the effect of capping agent content on the electrocatalytic methanol oxidation reaction (MOR) performance of synthetic materials. Electrochemical tests show that the hollow binary catalyst prepared with a capping agent content of 50 mg had the highest electrochemical active area. In particular, 4000-s chronoamperometry tests in acidic solution show that the stability of NiPt/C with hollow structure is enhanced. We ascribe the better catalytic activity to the hollow feature, higher specific electrochemical surface area, and more abundant active sites.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Sixing Chen,Yi Liu,Yanwei Sun,Guoliang Xu,Taotao Ji,Xiongfu Zhang,Fei Wang,Yi Liu
Concurrent manipulation of orientation and thickness of MOF membranes has become a reliable approach for improving their separation performances. In terms of oriented seeded growth, oriented deposition of MOF nanosheets during seeding process and sealing all intergranular gaps with no discernible increase in membrane thickness during secondary growth have become indispensable. In this study, we pioneered the fabrication of uniform hexagonal-shaped, 20–40 nm thick MIL-96 nanosheets through solvent composition optimization (V H2O /V FA = 1/2). Subsequently, spin coating was employed for c -oriented deposition of uniform MIL-96 seed layer, during which the addition of PVP in the suspension was found to be critical for obtaining qualified seed layer. Finally, well-intergrown, highly c -oriented ultrathin MIL-96 membrane was prepared upon employing NMF as the solvent during secondary growth. Gas permeation results implied that prepared MIL-96 membrane exhibited superior gas separation performance compared with that of a -& b -oriented counterpart.
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Nanoscale
·
2021
·Vol. 14
·期 5
·1796-1806
·
IF 7.79
Wenyan Yin,Milin Zhang,Jingyuan Liu,Khaled Tawfik Alali,Jing Yu,Jiahui Zhu,Peili Liu,Rumin Li,Jun Wang
Electrochemical sensors using ionic liquids as electrolytes for oxygen detection are now getting more and more attention. Recently, an ionic liquid combined with an electrochemically active catalyst system has become popular for boosting the sensing performance of oxygen sensors. In this work, the imidazolyl-based ionic liquid 1-butyl-2,3-dimethylimidazole bis((trifluoromethyl)sulfonyl)imide [Bmmim][TFSI] is first prepared by a facile two-step method. Subsequently, a transition metal and N-codoped porous carbon oxygen reduction electrochemical catalyst Cu–N/C is synthesized by calcining the Cu-doped ZIF-8 precursor and then blending it in different ratios with the ionic liquid [Bmmim][TFSI] as composite electrolytes for oxygen detection. The composite electrolyte Cu–N/C/[Bmmim][TFSI] exhibits increased responses in cyclic voltammetry (CV) and chronoamperometry (CA) relative to that of the pure ionic liquid. Furthermore, the CV and CA data show that 6% Cu–N/C/[Bmmim][TFSI] has the optimum oxygen sensing response with an enhanced reduction peak current, a sensitivity of 0.1678 μA/[% O2] and a good linear fitting coefficient of 0.9991. In conclusion, the results confirm the success of using Cu–N/C as an electrochemical catalyst composed of the Cu–N/C/[Bmmim][TFSI] electrolyte for improving the responsivity, stability and sensitivity towards a wide range of oxygen concentrations.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Sisheng Guo,Yuqi Zheng,Xinyue Zhang,Xinying Lei,Hongfei Sun,Tao Wen
MXenes materials are burgeoning candidates for advanced water purification . However, the self-restacking and surface passivation of MXenes severely hamper the utilization of their electronic properties and surface reactivity. Herein, we employed the strategy of carbon nanoplating stabilization of MXenes for not only effectively stabilizing the structure of MXenes but also providing nucleation growth of MnO 2 . The MXene@C@MnO 2 -activated PMS system was able to degrade ∼ 100% of bisphenol A (BPA) (20 mg/L) within 4 min with the turnover frequency (TOF) of 8.14 min −1 . Specifically, the generation of superoxide radicals by activation of peroxymonosulfate (PMS) through reversible redox cycling between Mn(IV) and Mn(III) cations was regarded as the crucial driver of BPA removal. The scale-up experiment in actual water bodies achieved more than 90% BPA removal at 1200-bed volumes with stable catalytic properties during 20 h continuous operation. This work offers a potential macroscopic MXene-based nanohybrids for advanced oxidation processes .
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JOURNAL OF NUTRITIONAL BIOCHEMISTRY
·
2026
·
IF 5.2
Liangyong Shao,Xiaohan Zhang,Jiamei Xin,Baorui Li,Huiyong Lian,Jiao Xie,Kai Yu,Ye Zhang,Hao Wang
Silibinin had both anti-obesity and anti-aging effects. • The effects of Silibinin on obesity and aging were linked to the IIS pathway. • Network pharmacology and molecular docking verified Silibinin 's anti-obesity mechanism. Although silibinin (SIL), from milk thistle, has been reported to promise health promotion and disease treatment, the potential mechanism of SIL in improving obesity is still unknown. The fat accumulation was decreased by 78% and 49% in cellular and high glucose-induced (HGI) Caenorhabditis elegans ( C.elegans ) models. The decreased lipid droplets in both average size and quantity in the cytoplasm of the liver and EWATs were obtained by histology (hematoxylin & eosin) experiments. The promoted health effects in lifespan, stress ability, antioxidant ability, changed lipofuscin accumulation, pharyngeal pumping rate, and aging-related indexes of exercise were also confirmed. The increased expressions of daf-2, akt-1, daf-16, and skn-1 , combined with the downstream target genes of IIS-mediated mTOR signaling factors ( pha-4, hlh-30, lgg-1, and unc-51 ) and adipose-related factors ( nhr-49, fat-5, fat-6, and fat-7 ) in C. elegans were verified through the insulin/insulin-like growth factor-1 signaling pathway. SIL was proposed as a potential adjuvant remedy or nutraceutical for improving obesity and promoting health. Download: Download high-res image (146KB) Download: Download full-size image
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Nano Research
·
2023
·
IF 9.9
Ning Qihong,Feng Shaoqing,Sun Qingwen,Yu Ruoyao,Li Tangan,Xu Hao,Cui Daxiang,Wang Kan
Efficient portable wearable sweat sensors allow the long-term monitoring of changes in the status of biomarkers in sweat, which can be useful in diagnosis, medication, and nutritional assessment. In this study, we designed and tested a wireless, battery-free, flexible, self-pumping sweat-sensing system that simultaneously tracks levodopa and vitamin C levels in human sweat and detects body temperature. The system includes a microfluidic chip with a self-driven pump and anti-reflux valve, a flexible wireless circuit board, and a purpose-designed smartphone app. The microfluidic chip is used for the efficient collection of sweat and the drainage of excess sweat. The dual electrochemical sensing electrodes in the chip are modified with functional materials and appropriate enzymatic reagents, achieving excellent selectivity and stability. The sensitivities of the levodopa sensor and the vitamin C sensor are 0.0073 and 0.0018 µA·µM −1 , respectively, and the detection correlation coefficients of both exceed 0.99. Both sensors have a wide linear detection range of 0–100 and 0–1000 µM, respectively, and low detection limits of 0.28 and 17.9 µM, respectively. The flexible wireless circuit board is equipped with the functions of wireless charging, electrical signal capture and processing, and wireless transmission. The data recorded from each sensor are displayed on a smartphone via a self-developed app. A series of experimental results confirmed the reliability of the sweat-sensing system in noninvasively monitoring important biomarkers in the human body and its potential utility in the comprehensive assessment of biological health.
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Catalysts
·
2023
·Vol. 13
·期 12
·1456
·
IF 3.9
Xin Teng,Junan Gao,Zuobo Yang,Xin Liang,Xiaokuan Wu,Jimmy Yun,Jie Zhang
Proton exchange membrane (PEM) water electrolysis for hydrogen production has a high current density and overall efficiency, and is a very promising hydrogen production strategy. However, its application is limited by the high anodic overpotential for oxygen evolution and the instability of catalysts. Therefore, anodic catalysts with a high activity and durability under acidic conditions need further research. Herein, we first synthesized the key intermediate Ru@Ir core-shell structures by controlling nanocrystals, then loaded them onto a carbon support and calcined to obtain a RuO2@IrO2/C core-shell nanocatalyst with a size smaller than 5 nm, whose activity exceeded that of commercial RuO2and commercial IrO2. After a 200 h stability test, the catalyst did not show significant performance degradation or structural degeneration. Finally, the prepared catalyst was assembled into a PEM electrolyzer showing the same results as the three-electrode tests, demonstrating its potential for practical applications and providing new insights for designing nanocatalysts suitable for industrialized PEM water electrolysis to produce hydrogenKeywords:PEM;OER;core-shell;structure;IrO2@RuO2/C
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yang Hu,Dewei Ni,Bowen Chen,Feiyan Cai,Xuegang Zou,Fan Zhang,Yusheng Ding,Xiangyu Zhang,Shaoming Dong
In this work, C f /(CrZrHfNbTa)C–SiC high-entropy ceramic matrix composites with good load-bearing, electromagnetic shielding and ablation resistance were designed and reported for the first time. The composites were fabricated by an efficient combined processing of slurry infiltration lamination (SIL) and precursor infiltration and pyrolysis (PIP). Density and porosity of the as-fabricated composites are 2.72 g/cm 3 and 12.44 vol.%, respectively, and the flexural strength is 185 ± 13 MPa. Due to the carbon fiber reinforcement with high conductivity and strong reflection, and high-entropy (CrZrHfNbTa)C ceramic matrix with strong absorbability, the total Electromagnetic interference shielding efficiency (SE T ) of the composites with a thickness of 3 mm are as high as 88.2 dB and 90 dB respectively in X-band and Ku-band. This means that higher than 99.999999 % electromagnetic shielding is achieved at 8–18 GHz, showing excellent electromagnetic shielding performance. The C f /(CrZrHfNbTa)C–SiC composites also present excellent ablation resistance, with the linear and mass ablation rates of 0.9 µm/s and 1.82 mg/s after ablation at the heat flux of 5 MW/m 2 for 300 s (∼2450 °C). This work opens a new insight for the synergistic design of structural and functional integrated materials with load-bearing, electromagnetic shielding and ablation resistance, etc.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Bo Liu,Biao Liang,Junjie Xiao,Mengfei Feng,Hui Cheng,Yuan Li,Yi Cheng,Kaifu Zhang
Metal-organic framework (MOF) derivatives exhibit great potential as microwave absorbing materials (MAMs) owing to their high porosity, abundant surface sites and tunable constituents. Herein, this paper proposed an efficient microstructure controllable strategy for synthesizing thin-thickness broadband MAMs named NiFe@C by regulating its material microstructure. NiFe-MOF-74 precursors were firstly prepared through solvothermal method. By controlling the supersaturation of precursors, three kinds of microstructures were obtained: 3-dimensional lotus-like nanorods self-assembled structure, 1-dimensional nanospheres/nanorods hybrid structure, and 0-dimensional nanospheres structure. Subsequently, NiFe@C derivatives were obtained by pyrolysis, inheriting the microstructures of NiFe-MOF-74. The lotus-like structure of NiFe@C achieves an effective absorption bandwidth (reflection loss < -10 dB) of 5.09 GHz (12.91–18.00 GHz) with thickness of only 1.6 mm, while the nanospheres structure of NiFe@C exhibits the maximum absorptance of 99.96% at 17.12 GHz with thickness of 2.3 mm. This work provides a facile direction for designing thin thickness MAMs with broadband microwave absorption capability.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sheng Pang,Zhenqian Zhang,Liangwei Cong,Youpeng Xu,Guoyu Qian,Dong Wang,Laishi Li,Yusheng Wu,Zhi Wang
The conventional method for synthesizing Ti 2 SC depends on the reaction between TiS and TiC, which requires the utilization of costly Ti, TiC, or TiS 2 powders. Utilizing TiO 2 as the raw material for the synthesis of Ti 2 SC enables the cost-effective preparation of this compound. However, the optimization of the TiO 2 /C/X n S m (sulfides) system is of utmost importance when aiming to synthesize Ti 2 SC through carbothermal-sulfurization of TiO 2 , as the formation temperature of TiS and TiC greatly depends on the X n S m . In this study, the identification of the thermodynamically dominant region for the formation of TiS and TiC in the TiO 2 /C/X n S m systems was conducted by utilizing various sulfides (63 types). Considering factors such as the challenges associated with removing by-products, accessibility, and toxicity, FeS 2 was ultimately chosen as a highly promising candidate. Thanks to the low melting point of FeS 2 , Ti 3 O 5 , the preliminary carbothermal reduction product of TiO 2 , has achieved rapid-deep deoxidation and phase reconstruction processes in the molten phase. Meanwhile, unlike the conventional solid-solid sintering reaction , which often results in residual reactants that are challenging to eliminate. This novel one-step phase transformation process that occurs in the molten phase exhibits minimal impurity phases, apart from the by-product Fe. Ti 2 SC with a purity greater than 99 wt% was obtained when the TiO 2 /C/FeS 2 was pickled to remove Fe after sintering at 1600 °C for 5 min. This work will provide the theoretical basis and a new path for the low-cost preparation of sulfur-containing MAX phases.
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