JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2024
·Vol. 107
·期 9
·5993-6003
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IF 3.5
Liang Su,Jiaxiang Lu,Huan Zhang,Xilin Li,Jinbo Wang,Haolun Wang,Sen Lin
The integration of thermal and electromagnetic interference (EMI) insulation is of great significance for fields such as aerospace that face extreme environments. The challenge lies in ensuring that the protective layer is lightweight while simultaneously possessing the ability to suppress heat conduction, heat convection, thermal radiation, and electromagnetic radiation. To address these challenges, we propose a novel ultralight all-fiber-structure composite sponge, yttria-stabilized zirconia/polyvinyl butyral-supported silver (YAP) nanofiber sponge, with ultralight mass (∼65 mg/cm 3 ), exceptionally low thermal conductivity (21 mW/m K at 25°C, and 329 mW/m K at 500°C), and remarkable EMI shielding effectiveness (∼62.6 dB). Moreover, benefiting from its all-fiber-structure, the YAP nanofiber sponge can endure 100 cycles of compression up to 50% of its original volume while retaining its mechanical properties with minimal degradation. These characteristics render YAP nanofiber sponge an ideal material for integrated thermal and EMI insulation, offering a promising solution to the rigorous demands of extreme environment protection such as space exploration.
研究领域:
材料科学
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纳米技术
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航空航天工程
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热工学
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电磁学
✓ 已验证
DOI
高影响因子
INTERNATIONAL OPHTHALMOLOGY
·
2024
·Vol. 44
·期 1
·1-10
·
IF 1.4
Fu Miao,Chen Yuanyuan,Yang Anhuai
Purpose Ochratoxin A (OTA) contamination of food and feed is a serious problem worldwide. OTA is considered a carcinogen and immunotoxic, nephrotoxic, and neurotoxic mycotoxin. The present study aims to determine the toxic effects of OTA on retinal ganglion cells (RGCs) and assess the resulting impairment of retinal function in mice. Methods RGC-5 cells were exposed to OTA (100 and 200 μg/L) for 3 days, and the mice were fed OTA-contain (100 and 200 μg/kg) diets for 4 weeks. Antioxidant indices were detected by spectrophotometer. The apoptosis of RGC-5 cells was determined by flow cytometry. Mitochondrial morphology and mitochondrial membrane potential were detected by immunofluorescence. RGC survival was determined by immunofluorescence staining with Brn3a. Flash electroretinography (ERG) was conducted to assess visual function. Results The oxidative-antioxidant balance suggested that OTA-induced severe oxidative stress, including increased reactive oxygen species (ROS) and malondialdehyde (MDA) levels in the OTA-exposed RGC-5 cells, and the reduced activity of superoxide dismutase (SOD) and glutathione-S-transferase (GST) in the OTA exposed group. Furthermore, OTA exposure led to remarkable apoptosis in RGC-5 cells. The mitochondrial detection showed that OTA caused significant mitochondrial membrane potential reduction and mitochondrial fragmentation, which may be the cause of apoptosis of RGC-5 cells. Additionally, in vivo experiments demonstrated that OTA resulted in significant death of RGCs and subsequent retinal dysfunction in mice. Conclusion Ochratoxin A induces mitochondrial dysfunction, oxidative stress, and RGCs death in mice.
研究领域:
毒理学
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眼科学
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细胞生物学
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生物化学
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神经科学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Jingyu Liu,Chaoyue Zhang,Daiyu Song,Yihang Guo,Jiyan Leng
Brønsted acidic ionic liquid (BAIL) functionalized dendritic fibrous nanosilica sphere catalysts, [C 3 PrIm][SO 3 CF 3 ]-DFNS (C 3 = PrSO 3 H), are prepared via a hexadecylpyridinium bromide reverse micelle-directed co-condensation of tetraethoxysilane and 3-chloropropyltriethoxysilane in a water-in-oil emulsion system followed by successive chemical modification with imidazole , 1,3-propanesultone and trifluoromethane sulfonic acid , and the particle diameter, fiber thickness and fiber density of the catalysts are well-adjusted by changing the composition of the starting materials. The [C 3 PrIm][SO 3 CF 3 ]-DFNS catalysts are successfully applied in transformation of 5-hydroxymethylfurfural (HMF) to ethyl levulinate (EL). Combination of superstrong Brønsted acidity and unique open three-dimensional dendritic fibrous nanostructures , the [C 3 PrIm][SO 3 CF 3 ]-DFNS can transform HMF in ethanol media rapidly and completely; nevertheless, the selectivity to EL remarkably depends on the fiber thickness and fiber density, which affect diffusion and mass transfer of the reactants and products as well as the accessibility to the acid sites. Among the tested [C 3 PrIm][SO 3 CF 3 ]-DFNS catalysts, the [C 3 PrIm][SO 3 CF 3 ]-DFNS- 1 with the thinnest fiber sheet and considerably high fiber density exhibits the highest selectivity to EL (93.0%). The [C 3 PrIm][SO 3 CF 3 ]-DFNS catalysts also show good reusability, and they can be reused at least for five times without obvious changes of the reactivity, total selectivity, morphology, textural properties and chemical structure .
研究领域:
催化
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纳米技术
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有机化学
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材料科学
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绿色化学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 23
·3636-3643
·
IF 4.724
Zhenyou Gui,Wenrong Cao,Shunmugavel Saravanamurugan,Anders Riisager,Lifang Chen,Zhiwen Qi
Graphical Efficient noble alloy : Au–Pd supported on zinc hydroxycarbonate (ZOC) catalysts shows high activity for 5-hydroxymethylfurfural oxidation. The basicity of ZOC can play a crucial role in enhancing the yield of FDCA. Moreover, Au–Pd/ZOC can be recycled at least six times without significant loss of its activity. Bimetallic catalysts with Au–Pd supported on zinc hydroxycarbonate (ZOC) were synthesized by a simple deposition–precipitation method and analyzed by transmission electron microscopy to have a narrow-size distribution of predominantly 1–2 nm. The prepared Au–Pd/ZOC catalysts exhibited excellent activity towards 5-hydoxymethylfurfural (HMF) oxidation in water in the presence of the base NaHCO 3 at benign conditions of 80 °C and 3 bar O 2 , resulting in quantitative yield of 2,5-furandicarboxylic acid (FDCA). The addition of base not only enhanced the yield of FDCA but also stabilized the support ZOC by preventing ZOC from the reaction with formed carboxylic acid intermediates/products, thus allowing Au–Pd/ZOC to be recycled for at least six times without significant loss of activity. The basicity of ZOC could play an important role in obtaining the improved yield of FDCA as compared to other supports.
研究领域:
催化化学
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绿色化学
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化学工程
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材料科学
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有机合成
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 1
·57-65
·
IF 1.093
Liu Wolong,Zhang Jiupeng,Liu Qi,Pei Jianzhong,Zhu Cunzhen,Liu Peng
Micro-damages always occur and accumulate in asphalt pavement materials under the effects of temperature, vehicle loads and other factors during service. Accordingly, self-healing microcapsules could be added into asphalt binder and repair micro-damages to prevent damage extension in
time. In this study, the emulsified rejuvenator and melamine-urea-formaldehyde resin (MUF) were selected as the core and cyst wall materials, respectively, and in-situ polymerization method was applied to synthesize the novel microcapsules. The effects of emulsifier dosage and curing
time were revealed on the particle size, dispersion, surface morphology and coating properties, and the optimum process parameters were determined for microcapsules. Then, the micro morphology, molecular structure, and thermal stability were further investigated to determine the optimal preparation
of the microcapsules. Finally, the linear amplitude sweep (LAS) test was performed to evaluate the self-healing efficiency of the asphalt binder with different dosages of prepared microcapsule, and the optimal dosage of microcapsules was determined as 0.5%.
研究领域:
材料科学
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土木工程
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BMC Chemistry
·
2023
·Vol. 17
·期 1
·1-14
·
IF 4.6
Wei Jia,Yan Luchun,Zhang Zhifang,Hu Bing,Gui Wenjun,Cui Yanjun
Acid red 73 is an azo dye, and its residue can pollute the environment and seriously threaten human health and life. In this study, glutaraldehyde was used as the crosslinking agent, chitosan and polyvinyl alcohol were crosslinked under appropriate conditions to obtain a chitosan hydrogel film, and carbon nanotubes were dispersed in the chitosan hydrogel film. The FTIR, XRD, BET, SEM were applied to chatacterize the structure and the morphology of the absorbent and results showed that when the mass fraction of the carbon nanotubes was 1%, the structure was a three-dimensional network with microporous, and the water absorption reached to the maximum value of 266.07% and the elongation at break reached to a maximum of 98.87%. The ability to remove acid red 73 from aqueous and soil environments was evaluated by UV. In the aqueous samples, 70 mg of the adsorbent reached a saturated adsorption capacity of 101.07 mg/g and a removal rate of 92.23% at pH = 5. The thermodynamics conformed with the Langmuir adsorption isotherm and pseudo second-order adsorption kinetic models. In the soil samples, 100 mg of the adsorbent reached an adsorption capacity of 24.73 mg/g and removal rate of 49.45%. When the pH of the soil is between 4 and 7, the removal rate and adsorption capacity do not change much; hence, the pH should be maintained between 5.2 and 6.8, which is extremely suitable for the growth of general plants. Moreover, the experimental results demonstrated that the adsorbent maintained a good removal rate of acid red 73 over six adsorption cycles. Graphical
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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土壤修复
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高分子科学
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分析化学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 5
·2026-2038
·
IF 9.6
Xu Bin,Jia Lu,Yang Hui,Wang Yue,Fan Si-Yu,Yuan Sai-Sai,Zhang Qi-Tao,Zhang Ming,Ohno Teruhisa
In this study, the truncated octahedral CeO 2 (CeO 2 -to) with special morphology was prepared by the solvothermal method with oleic acid (OA) and oleamine (OM) as the morphology-directing agents. High-resolution transmission electron microscopy (HRTEM) results show that CeO 2 -to exposes composite {100} and {111} facets, while CeO 2 cubic (CeO 2 -c) and CeO 2 octahedral (CeO 2 -o) only expose single crystal facets of {100} plane and {111} plane, respectively. Interestingly, this CeO 2 -to photocatalyst exhibits remarkable photooxidation performance of gaseous acetaldehyde (CH 3 CHO) degradation, in which CO 2 generation value reaches 1.78 and 7.97-times greater than that of CeO 2 -c and CeO 2 -o, respectively. In addition, the active species trapping experiment signifies that superoxide (·O 2 − ) and holes (h + ) are the main reactive substances during the CH 3 CHO degradation process, and the electron paramagnetic resonance (EPR) spectra indicates that the former is the major contributor. Notably, the electron transfer mechanism between CeO 2 -to {100} and {111} facets and the surface oxygen adsorption ability are revealed via density functional theory (DFT) calculations. It is also confirmed that {100} facets are more conducive to the absorption of acetaldehyde than {111} facets. Finally, a reasonable mechanism for improved photocatalytic CH 3 CHO degradation on CeO 2 -to is proposed based on relevant experiments and DFT calculations. This study demonstrates that the systematic development of surface homojunction structured photocatalysts can efficiently increase the degradation activity for volatile organic compounds (VOCs). It also offers additional direction for optimizing the photocatalytic activity of other cerium-based photocatalysts. Graphical abstract
研究领域:
材料科学
·
环境科学
·
纳米技术
·
物理化学
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）