EUROPEAN POLYMER JOURNAL
·
2026
·
IF 6.8
Panpan Li,Yuhao Wang,Yifan Pian,Le Zhang,Jianyu Zhao,Zhijian Wang,Jiping Yang
Thermal protection materials for high-speed aerospace vehicles require a combination of excellent heat resistance, mechanical reliability, and lightweight characteristics. In this work, epoxidized hollow glass fibers (HGF) were incorporated into an epoxy silicone resin/phenolic resin (ESR/PR) hybrid resin matrix to overcome the intrinsic brittleness and high density of conventional phenolic-based composites. The successful grafting of epoxy functional groups onto the fiber surface enables strong interfacial bonding through co-crosslinking reactions with the ESR/PR matrix. Meanwhile, the hollow structure of HGF reduces density and provides intrinsic thermal insulation. The optimized ESR/PR-15HGF composite exhibits a tensile strength of 50.4 MPa (12.5 % improvement compared to ESR/PR matrix), elongation at break of 3.2 %, and a high specific strength of 3.97 × 10 4 m 2 /s 2 , achieving superior performance at lower filler content compared to solid glass fiber systems. Thermogravimetric analysis further reveals enhanced thermal stability, with a higher decomposition temperature (428 °C) and increased char yield (78.6 %). These improvements arise from the synergistic effects of enhanced interfacial interactions, fiber reinforcement, and hollow structure-induced thermal insulation, offering a promising strategy for advanced lightweight thermal protection materials.
✓ 已验证
产品关联
DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2018
·Vol. 94
·期 4
·650-658
·
IF 2.214
Rong Liu,Yonggang Zhang
Photoelectrocatalytic (PEC) system greatly improves the migration of photoexcited charges, retards the fast recombination of electron-hole and increases the lifetime of photogenerated holes. In this article, we constructed a novel PEC system to degrade berberine chloride form (BCF). XRD patterns indicated aging time was an important condition for the crystal type of TiO 2, and the best proportion of anatase/rutile was 80/20. The band gap energy of the TiO 2 was 3.01 eV. We demonstrated that a synergistic effect existed between photocatalysis (PC) and electrocatalysis (EC). Besides, we discussed the influence of pH, current density, the amount of catalyst and initial BCF concentration on the degradation of BCF. Electron spin resonance (ESR) through spin trap 5, 5-dimethyl-1-pyrroline-N-oxide (DMPO) and the scavenging experiments suggested that the reactive oxygen species (ROS) were superoxide radicals ( ), hydroxyl radicals (·OH) and sulfate radical ( ) in PEC system. Furthermore, we compared the two pathway of formation DMPO-SO 4 adducts and found that was the most major oxidized species in degrading BCF. We proposed a plausible reaction mechanism. Intriguingly, even under lower current and weaker light conditions, the PEC process maintained its effectiveness, demonstrating the feasibility of the PEC approach.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2016
·
IF 4.052
Shuang Zang,Sizhu Tian,Jia Jiang,Dandan Han,Xinyu Yu,Kun Wang,Dan Li,Dayong Lu,Aimin Yu,Ziwei Zhang
Twenty-one kinds of fruits including strawberry, mulberry, lemon, banana, etc. were measured for antioxidant capacity based on their ability to scavenge 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical. Vitamin C equivalent antioxidant capacity (VCEAC) was used to quantify antioxidant capacity of the studied fruits. The results were expressed as mg of ascorbic acid equivalent per 100 g fruit. Each fruit was divided into two parts: harvest part (fresh fruit analyzed immediately), and liquid nitrogen frozen part (fruit frozen and pulverized in liquid nitrogen). Antioxidant capacities of both fresh and frozen fruits were determined, and VCEAC values were proved to have no significant difference. For the frozen fruits, the antioxidant capacities were measured by electron spin resonance spectroscopy (ESR) and UV–vis spectrometry. VCEAC values obtained with UV–vis and ESR range from 11.48 to 345.75 mg/100 g and 7.01 to 366.26 mg/100 g. Experimental results indicated that VCEAC values obtained by two methods were highly correlated.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 89
·86602-86606
·
IF 3.289
Zhen Lin,Namei Wu,Wensong Yao,Jinyuan Chen,Shaoguang Li,Ailin Liu,Xinhua Lin
Chemiluminescence (CL) happened in chemical reactions, in which electronically excited intermediates or products were obtained and subsequently released energy with emission of light. CL is a useful approach to investigate active radicals involved in one system. In the present work, we first found SiC·SiOx, a new kind of zero-dimensional silicon-based nanomaterial, owned CL properties in the presence of Ce(IV)–Na2SO3. The CL mechanism was further investigated by the CL, ultraviolet-visible light (UV-vis), and electron spin resonance (ESR) spectra. Mechanistic investigation indicated SiC·SiOx increased the generation of singlet oxygen in the Ce(IV)–Na2SO3 system and excited SiC·SiOx could be produced from the combination of hole and electron injected SiC·SiOx. This opens up an avenue for investigating the CL properties of SiC·SiOx and promotes their application in various fields.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2013
·Vol. 19
·期 42
·14279-14285
·
IF 5.831
Dengrong Sun,Yanghe Fu,Wenjun Liu,Lin Ye,Dengke Wang,Lin Yang,Xianzhi Fu,Zhaohui Li
Graphical Higher CO 2 photoreduction activity than previously studied metal–organic framework (MOF) NH 2 -MIL-125(Ti) in the presence of triethanolamine (TEOA) as the sacrificial agent under visible light is exhibited by the amino-functionalized MOF NH 2 -Uio-66(Zr). The photoinduced electron transfer from 2-aminoterephthalate linkers to Zr oxo clusters was revealed for the first time by photoluminescence studies, and the generated Zr III was detected by ESR analysis (see figure). Metal–organic framework (MOF) NH 2 -Uio-66(Zr) exhibits photocatalytic activity for CO 2 reduction in the presence of triethanolamine as sacrificial agent under visible-light irradiation. Photoinduced electron transfer from the excited 2-aminoterephthalate (ATA) to Zr oxo clusters in NH 2 -Uio-66(Zr) was for the first time revealed by photoluminescence studies. Generation of Zr III and its involvement in photocatalytic CO 2 reduction was confirmed by ESR analysis. Moreover, NH 2 -Uio-66(Zr) with mixed ATA and 2,5-diaminoterephthalate (DTA) ligands was prepared and shown to exhibit higher performance for photocatalytic CO 2 reduction due to its enhanced light adsorption and increased adsorption of CO 2 . This study provides a better understanding of photocatalytic CO 2 reduction over MOF-based photocatalysts and also demonstrates the great potential of using MOFs as highly stable, molecularly tunable, and recyclable photocatalysts in CO 2 reduction.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Immunology
·
2020
·
IF 5.085
Ma Zhanchuan,Zhen Yu,Hu Cong,Yi Huanfa
Myeloid-derived suppressor cells (MDSC) play a crucial role in regulating the intestinal immune response during colitis. We previously revealed an essential role of MDSC in promoting TH17 cell polarization, which was found to be arginase-1 (Arg-1)-dependent; however, the underlying mechanism remains obscure. Here we report that percentage of MDSC decreased in ArgmyeKO mice during DSS-induced colitis. IL-17A levels reduced but IL-17F levels increased significantly in the colorectum of ArgmyeKO mice, leading to severe tissue damage and high risk of mortality rate. Activation of estrogen receptor (ESR) increased pSTAT3 level in MDSC and consequently led to elevated percentage of MDSC and more Arg-1 and inducible nitric oxide synthase expression in MDSC. Increased level of IL-17A and reduced level of IL-17F alleviated colitis in mice consequently. Together, these findings demonstrate a protective role of MDSC-derived Arg-1 during colitis after activates ESR/STAT3 signaling in MDSC. High level of Arg-1 favors accumulation of IL-17A, but reduced IL-17F expression in the colorectum of mice and ultimately leading to relief of colitis, indicating a potential clinical impact of MDSC-derived Arg-1 for controlling inflammatory bowel disease.
研究领域:
免疫学
·
分子生物学
·
消化病学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xingrui Yu,Chao Xiong,Yichao Liang,Xiantai Zhou,Can Xue
Epoxides are important bulk chemicals, playing irreplaceable role in the chemical industry, but facing serious pollution and low productivity in the production process. Therefore, the development of green and efficient epoxidation of olefins by stable catalysts with low prices is of great significance. In this study, a Mo-MATP catalyst was prepared by modifying Mo(CO)₆ on attapulgite through Si-O bonding. Mo-MATP exhibits excellent performance (99% yield of cyclooctane oxide, CYCO) and stability (80% selectivity of CYCO after 17 cycles), highly tert -butyl hydroperoxide (TBHP) utilization, and extensive substrate scalability. Furthermore, the in-situ Fourier Transform Infrared Spectroscopy (FT-IR), Electron Spin-resonance Spectroscopy (ESR) and High Resolution Mass Spectrometry (HRMS) spectra suggest that TBHP would be activated by Mo-MATP to generate peroxyl radicals, which then oxidize alkenes to their corresponding epoxides. In this study, the stable loading of Mo would largely solve the problem of Mo loss during the catalytic process, thus providing a stable and dispersed Mo active center, enabling the catalyst to possess high catalytic performance and recycling stability.
研究领域:
催化化学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2025
·
IF 3.8
Lu Meijun,Zhao Chen,Ma Mo,Shi Hui,Lu Mingming,Tian Yuan,Song Daqian,Zhang Ziwei
The abnormally high expression of glutathione (GSH) in hepatocellular carcinoma (HCC) cells significantly contributes to chemotherapy resistance by neutralizing reactive oxygen species (ROS). To address this problem, we developed a nanocomposite probe (micelle@PDA@MnO 2 NPs) which was composed of free radical-labeled micelles as the core, polydopamine (PDA) as the inner shell and MnO 2 nanosheets as the outer shell. In the HCC microenvironment, the over-expressed GSH triggered the decomposition of the MnO 2 shell, releasing Mn 2+ ions, and subsequently, the acidic condition and over-expressed carboxylesterase 2 (CES2) worked together to mediate the controlled release of nitroxide free radicals (i.e., TEMPONE) from the micelle core. With the help of dual-signal electron spin resonance (ESR) detection, it was found that much more free radicals and Mn 2+ were released in hepatoma cells than in normal liver cells, rendering the proposed nanotherapeutic platform specific to HCC and a good candidate for free radical therapy and chemodynamic therapy (CDT). Moreover, the therapy featured an intelligent self-amplified property: the abundant GSH in the tumor microenvironment rapidly activated the decomposition of the nanocomposite and triggered the release of free radical TEMPONE and Mn 2+ , and TEMPONE and Mn 2+ further amplified the oxidative stress to induce tumor apoptosis via ROS generation and GSH depletion. Finally, in combination with three therapy modes (Mn 2+ -mediated CDT, the oxidative stress enhancement effect of TEMPONE, and PDA-based photothermal therapy), significant therapeutic effects including facilitation of HepG2 cell apoptosis and inhibition of tumor growth in the HCC mouse model were achieved.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Kuan Chen,Tianhong Xu,Hongjian Xu,Qiang Wu,Weiguo Pan
We designed and succeeded in synthesising a sequence of g-C 3 N 4 /Zn 3 In 2 S 6 (ZIS) composite photocatalysts by means of one-step hydrothermal synthesis, which integrated different amounts of g- C 3 N 4 into ZIS. The prepared products are characterized by means of various characterization methods to determine their structure, morphology and physicochemical properties. Their photocatalytic activities were assessed according to the performance of tetracycline (C 22 H 24 N 2 O 8 , TC) degradation experiments with light radiation. This consequence of experiments showing that the g-C 3 N 4 (0.5 wt.%)/ZIS photocatalyst is most effective for the photodegradation of TC. Moreover, results from the cyclic tests confirm the stability of the g-C 3 N 4 (0.5 wt.%)/ZIS composite, which remained active after five cycles of repeated photocatalysis experiments. We can get the conclusion that O 2 - , OH and h + all played roles during the degradation process from the figures of ESR tests and active species trapping experiments. And the corresponding degradation mechanism of g-C 3 N 4 /ZIS composites is proposed. High specific surface areas, desirable absorption capability, suppression of charge recombination should be put down to its nice photocatalytic performance. Thus, it can be considered that g-C 3 N 4 /ZIS composites have broad potential application prospects in photocatalysis degradation.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuerui Ma,Peng Chen,Jiazhen Liao,Xing’an Dong,Wenjie He,Wendong Zhang
Selective photocatalytic oxidation of NO to nitrate (NO 3 – ) over toxic NO 2 remains challenging due to low selectivity and inefficient charge migration in existing systems. This study introduces Fe 3+ as an electron acceptor beneath a Bi 4 TaO 8 Cl/Bi 2 O 2 CO 3 heterojunction to precisely regulate electron pathways and promote targeted hydroxyl radical ( • OH) generation. Combined experimental and DFT analyses reveal Fe 3+ ’s dual role: enhancing interfacial electron transfer and activating H 2 O at surface sites to form • OH. The optimized heterojunction achieves 68.19 % NO conversion with minimal NO 2 selectivity (10.98 %). ESR and ROS quenching confirm Fe 3+ -driven electron migration enriches surface holes, boosting H 2 O adsorption and • OH production (2.76-fold increase). The strong oxidation capacity of • OH suppresses NO 2 formation, favoring complete NO oxidation to NO 3 – . This work provides a strategic approach for selective NO removal by electron-pathway engineering, advancing the design of eco-friendly photocatalysts for air pollution control.
研究领域:
环境化学
·
光催化
·
材料科学
·
化学工程
·
大气污染控制
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 410
·期 6
·1817-1824
·
IF 3.431
Jiang Jia,Tian Sizhu,Wang Kun,Wang Yang,Zang Shuang,Yu Aimin,Zhang Ziwei
With the help of iron oxide nanoparticles, electron spin resonance spectroscopy (ESR) was applied to immunoassay. Iron oxide nanoparticles were used as the ESR probe in order to achieve an amplification of the signal resulting from the large amount of Fe 3+ ion enclosed in each nanoparticle. Rabbit IgG was used as antigen to test this method. Polyclonal antibody of rabbit IgG was used as antibody to detect the antigen. Iron oxide nanoparticle with a diameter of either 10 or 30 nm was labeled to the antibody, and Fe 3+ in the nanoparticle was probed for ESR signal. The sepharose beads were used as solid phase to which rabbit IgG was conjugated. The nanoparticle-labeled antibody was first added in the sample containing antigen, and the antigen-conjugated sepharose beads were then added into the sample. The nanoparticle-labeled antibody bound to the antigen on sepharose beads was separated from the sample by centrifugation and measured. We found that the detection ranges of the antigen obtained with nanoparticles of different sizes were different because the amount of antibody on nanoparticles of 10 nm was about one order of magnitude higher than that on nanoparticles of 30 nm. When 10 nm nanoparticle was used as probe, the upper limit of detection was 40.00 μg mL −1 , and the analytical sensitivity was 1.81 μg mL −1 . When 30 nm nanoparticle was used, the upper limit of detection was 3.00 μg mL −1 , and the sensitivity was 0.014 and 0.13 μg mL −1 depending on the ratio of nanoparticle to antibody.
Schematic diagram of procedure and ESR spectra
研究领域:
分析化学
·
纳米技术
·
生物化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Sizhu Tian,Xuwen Li,Jia Jiang,Li Tang,Hanqi Zhang,Yong Yu,Ziwei Zhang
Water soluble copper sulfide (CuS) nanoparticles were synthesized using l -cysteine as the ligand. Multiple biotins were conjugated to the antibody of rabbit IgG, and the streptavidin was attached to the CuS nanoparticles. The Cu 2+ ions enclosed in the nanoparticles were used as the electron spin resonance (ESR) probes and detected with ESR spectrometer. The immunoassay reaction was resulted in the formation of the coating antibody attached to the microplate well, the detecting antibody labeled with the biotins, and the streptavidin attached to the CuS nanoparticles. After the immunoassay reaction was performed, large amount of Cu 2+ /Cu + ions inside the nanoparticles were released with the help of diethyldithiocarbamate (DDC) and the Cu 2+ -DDC complex formed. The Cu 2+ -DDC complex was extracted into n -butanol, which was used as the analytical sample. Both ESR and UV–vis signals were collected for the analytical sample. The double logarithm standard curve was well simulated with a linear regression equation. The limits of detection of the rabbit IgG were 1.76 pg/mL and 2.36 pg/mL by ESR and UV–vis method, respectively. The detection range using ESR as the detector was from 8.8 pg/mL to 500 ng/mL, covering almost 5 magnitude orders of the rabbit IgG concentrations. The rabbit serum was analyzed and the rabbit IgG concentration was found to be 7.76 mg/mL. The reproducibility of the present method was good enough with the intra-assay error within 3.4 % and the inter-assay error within 11.2 %. The spiked serum samples were analyzed and the experimental results indicated that the recoveries were from 108.2 to 113.7%.
研究领域:
生物化学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）