JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2022
·Vol. 148
·期 3
·789-805
·
IF 4.755
Zhu Di,Huang Zhixiong,Shi Minxian,Qin Yan,Zou Zhenyue,Deng Zongyi
BPR has been widely used as ablative material for thermal protection on aircraft surface. In this study, model-free method was employed to study the kinetic models of BPR and ZrSi 2 /B 4 C-Ph composite. In addition, the thermal stability, chemical reaction and structure evolution during pyrolysis of ZrSi 2 /B 4 C-Ph composite were characterized by TGA, XRD, XPS, GC–MS and TG-MS. The results indicated that the pyrolysis of BPR includes three consecutive and overlapping stages. And the kinetic mechanism function f(α) , apparent activation energy E a and pre-exponential factor A of each stage were confirmed. Besides, the high char yield of ZrSi 2 /B 4 C-Ph composite is mainly attributed to the reaction of ZrSi 2 and B 4 C with gases released during BPR pyrolysis, which formed solid phases such as amorphous carbon, ZrO 2 , SiO 2 and B 2 O 3 .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junguo Li,Chenhan Zhao,Feng Jiang,Shiquan Zhang,Suohui Yang,Qianqian Xiang,Meijuan Li,Jian zhang,Qiang Shen
Ceramizable carbon fiber/boron-modified phenolic resin (C f /BPR) composites are cost-effective and suitable for fabricating large-scale components, making them vital for thermal protection systems in aerospace vehicles. However, their thermal resistance requires further improvement. This study investigates the modification of C f /BPR composites using ZrSi 2 , Al, and mica to enhance their thermal resistance. High-temperature static oxidation and oxyacetylene ablation tests are conducted to evaluate their high-temperature performance. The role of each filler on oxidation resistance is discussed. The results reveal that when ZrSi 2 is added at 33.75 phr, Al at 3.75 phr, and mica at 5 phr, the prepared composite exhibits a flexural strength of 56 MPa after 20 min of static oxidation at 1600 °C, with excellent protection of the carbon fibers. After oxidation at 1670 °C, the flexural strength remains at 45 MPa, despite some degree of carbon fiber ablation.
研究领域:
航空航天材料
·
材料科学
✓ 已验证
DOI
高影响因子
Beverage Plant Research
·
2026
·Vol. 6
·期 1
·
IF 3.5
Huijie Yang,Yan Li,Haitao Wen,Mingwei Xie,Shuqia Ding,Zhonghua Liu,Shuxian Cai
This study integrated widely targeted metabolomics, network pharmacology, and transcriptomics to systematically analyze changes in bioactive components and anti-inflammatory effects of Rucheng Baimaocha white tea (Baihao Yinzhen and Shoumei) with different storage years. The results showed that the aging process significantly altered the chemical composition of white tea: Baihao Yinzhen enriched amino acids and their derivatives, while Shoumei accumulated alkaloids, phenolic acids, lipids, and terpenes with decreased flavonoids and lignans. Cell experiments showed that white tea water extracts concentration-dependently inhibited excessive NO release in LPS-induced RAW264.7 cells, with seven-year-aged samples exerting stronger anti-inflammatory effects than one-year-aged ones. Multi-omics analysis identified key bioactive components (9, 10-dihydroxy-12, 13-epoxyoctadecanoic acid, ligraminol E, etc.) and core targets (HSP90AA1, TOP2A, etc.), and revealed that aged white tea exerted anti-inflammatory effects by regulating related signaling pathways and metabolic processes. In conclusion, aging can significantly enhance the anti-inflammatory activity of Rucheng Baimaocha white tea. These findings provide a scientific basis for clarifying the material basis and anti-inflammatory mechanism of aged white tea, and lay a foundation for its further functional development and mechanism verification.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shiquan Zhang,Jian Zhang,Sheng Hu,Ruizhi Zhang,Junguo Li,Qiang Shen
Ablative thermal protection materials are widely used in entry and re-entry vehicles which benefit from their strong adaptability. However, long-term ablation has been a limitation due to the consumption of the matrix of the ablative materials. In this work, the microstructure evolution and ablation properties of the MoSi 2 /mica-modified CF/BPR composites with and without hollow silicate glass microspheres (HSMs) under protracted ablation have been investigated. The mass ablation rates decreased while the linear ablation rates increased when the ablation times were prolonged. The composites with 30 vol.% HSMs have good insulation properties, shown by a lower backside temperature of 240.9 °C after 100 s of ablation. The decrease in thermal conductivity limited heat transfer in both the axial and horizontal directions. This led to heat concentration and severe ablation at the central surface. The three-dimensional porous and the ladder structure formed in the transfer region, and the features gradually disappeared while extending the ablation times because of the flame erosion and formed liquid phases. The heat diffusion and concentration within the matrix established a gradient temperature field, which determined the ablation behavior and mechanism, providing valuable insights for the development of advanced ablative thermal protection materials.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shiquan Zhang,Jian Zhang,Suohui Yang,Minxian Shi,Junguo Li,Qiang Shen
Ablation material had been widely used in aerospace attributed to its reliability and strong adaptability but was usually accompanied by low strength at higher temperatures. Here, a high flexural strength of 66.91 MPa after ablation at 1500 °C of carbon fiber/boron phenolic resin (CF/BPR) composite modified by MoSi 2 and mica was reported. With the proportion of MoSi 2 and mica was 9:1, the formed appropriate content of the liquid phase improved the reactivity of MoSi 2 powders and provided a suitable interfacial state between CF and the matrix. The result of the oxygen-acetylene test showed that the mass ablation and the linear ablation reduced to 0.034 g/s and 0.006 mm/s, respectively. Owing to the formed liquid phase wrapping the carbon fiber and ceramic layer on the surface improved the ablation resistance. These high-strength CF/BPR composites have strong potential in new aerospace materials.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Shiquan Zhang,Jian Zhang,Suohui Yang,Sheng Hu,Junguo Li,Qiang Shen
Improving the ablation and mechanical properties of ablative thermal protection composites by introducing modified fillers which simultaneously with an unavoidable increase in density. Balancing this increase in density while achieving lightweight properties is crucial for the development of effective ablative composites. In this paper, different contents of the hollow silicate glass microspheres (HSMs) are incorporated into MoSi 2 /mica-modified CF-BPR composites to investigate the impact of HSMs. The results show that HSMs play a positive role in reducing the density and thermal conductivity of the composite. The ablation and insulation properties of the 30 vol.% HSMs composites exhibit a mass ablation rate of 0.035 g/s and a linear ablation rate of 0.015 mm/s, alongside the lowest backside temperature. A significant improvement in flexural strength after static ablation at 1500 °C reached 82.59 MPa and maintained a relatively high level after 1600 °C. HSMs act as interlaminar skeletons, enhancing the shearing strength of the composite and facilitating the formation of a protective liquid phase around the carbon fibers to prevent oxidation. The increasing toughness of carbon fibers further enhances the mechanical strength of the composites.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yandai Lin,Yanxi Yang,Xueli Ren,Zhe Liu
Exogenous electrical stimulation has attracted considerable attention due to the advantages of microelectric induction and subsequent biological effects such as actin reorganization and reactive oxygen species (ROS) generation. Herein, an injectable hydrogel of BPR-ARG@Gel (BAG) with pyroelectric BPR nanoparticle loading and l-arginine (ARG) introduction was fabricated for advanced cancer therapy in vivo. Due to the photothermal effect, the holes and electrons in BPR nanoparticles were separated to produce an open-circuit voltage and consequently catalyze water H2O to generate toxic superoxide (•O2–) and hydroxyl radicals (•OH). These ROS substances further oxidize ARG to produce NO for synergistic tumor treatments. The mice experiments indicated that the employment of BAG hydrogel incorporation with a near-infrared laser downregulated the heat shock protein and recruited immune cells with 5-fold-enhanced expression of proinflammatory cytokines of interferon-γ. It was also noteworthy that the injectable hydrogel of BAG substantially induced the generation of reactive oxygen/nitrogen species (ROS/RNS) with reliable biosafety and strong tumor inhibition. Overall, these findings have provided potentially new inspirations and a feasible strategy to translate this multifunctional hydrogel toward tumor therapy in a pyroelectric stimulation manner.
研究领域:
癌症治疗
·
材料科学
·
生物医学工程
·
纳米技术
·
免疫疗法
✓ 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）