JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Chengxiang Yang,Tingting Gou,Haoyu Wang,Qi You,Wenwei Lai,Yue Wang,Zhihao Du,Zhaobin Tang,Wei Liu,Xuchuan Jiang
Narrow-band red phosphors excited by blue light are vital for high-color-rendering lighting and wide-color-gamut displays. Nevertheless, the commonly utilized red phosphors exhibit considerable deficiencies in hydrothermal stability and color purity, thus constraining their practical usage. In this study, by using a developed doping strategy with Ca 2+ to regulate a local crystal field and the possible preferential occupation behavior of the Sr 2 YNbO 6 :Eu 3+ red phosphor with a double perovskite structure, it is found that their luminescence intensity and thermal stability are significantly enhanced. High-resolution scanning transmission electron microscope (STEM) measurements equipped with an aberration corrector revealed that Eu 3+ occupied the Sr 2+ or Y 3+ sites, forming two emission centers. This resulted in significant changes in the emission intensity at 594 nm and 611 nm with changes in the excitation wavelength. Furthermore, the introduction of Ca 2+ can increase the proportion of Eu 3+ at the Sr 2+ site, thereby enhancing the emission of the 5 D 0 → 7 F 2 transition at 611 nm. Meanwhile, we have significantly improved the color purity and thermal stability of the obtained red phosphors. The current findings reveal the site-selective luminescence mechanism in Eu 3+ -activated double perovskite structures and propose a cation substitution strategy to optimize excitation and emission simultaneously. This approach may provide an effective pathway for the design of high-performance red phosphors for advanced optoelectronic applications.
研究领域:
材料科学
·
发光材料
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无机化学
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固态化学
·
光学材料
·
功能材料
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Linlin Yi,Huan Liu,Geng Lu,Qiang Zhang,Jiaxing Wang,Hongyun Hu,Hong Yao
Considerable amounts of NOx are generated from the thermal utilization of solid wastes. To control NOx emission, we investigated the influence of mixed Fe/Ca additives on the generation of NOx precursors (HCN and NH3) during pyrolysis at 873, 1073, and 1273 K. Protein, proline, and phenylalanine were selected as model compounds to represent the primary nitrogen forms in typical solid wastes, such as biomass and sludge. According to the results, the iron effect is a remarkable property that enables the obvious reduction of NH3. This was most likely because NH3 was consumed by iron compounds to generate FeNx. Iron compounds facilitated thermal cracking of heterocyclic N with the release of HCN. Ca(OH)2 promoted the conversion of HCN to NH3 and fixed HCN to form CaCxNy simultaneously. These intermediates (FeNx and CaCxNy) play important roles in the reduction of NOx precursors. A lower emission of NOx precursors was observed with mixed Fe/Ca additives than with either Fe or Ca individually. This is because the generation of Ca2Fe2O5 enhanced the tranformation of intermediates to N2. The transformation of intermediates to N2 was enhanced at elevated temperatures, which allows for the lowest emission of precursors (NH3 and HCN) at 1273 K, with a higher ratio of Ca2Fe2O5 in char.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Yingguang Li,Mingwei Fu,Peng Qiao,Shulian Liu,Degang Deng,Shiqing Xu,Hongping Ma
In this study, a non-activated ion-doped full-spectrum emission phosphor for white light-emitting diode (WLED) lighting is proposed using oxygen defect engineering. The YMZn 3 AlO 7 (M = Ca, Sr, Ba) phosphors with "114″ structure were prepared via a high-temperature solid-state reaction. Under excitation with 373 nm ultraviolet (UV) light, YSrZn 3 AlO 7 in YMZn 3 AlO 7 (M = Ca, Sr, Ba) exhibited the highest emission intensity and formed a wide yellow emission band centred at 563 nm. The full width at half maximum of the YSrZn 3 AlO 7 phosphor was 172.6 nm. A theoretical model based on the designed oxygen vacancies was proposed to determine the self-activated luminescence mechanism. Density functional theory calculations revealed that oxygen vacancies lead to the generation of new energy levels. Electron paramagnetic resonance experiments further confirmed that the luminescence originated from oxygen vacancies. Eventually, a warm WLED device ((x, y) = (0.4057, 0.4359)) with a correlated color temperature of 3814 K and a relative color rendering index of 83 was successfully prepared using the YSrZn 3 AlO 7 phosphor and a 365 nm UV LED chip. These results suggest that YSrZn 3 AlO 7 is a promising WLED phosphor and provide new insights into the application of self-activated phosphors in WLED.
研究领域:
材料科学
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光电技术
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照明技术
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DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 5
·687-692
·
IF 1.713
Chen Zhang-lin,Liu Kai,Yuan Xuan-yi,Chen Ke-xin
Nitrogen-rich Eu 2+ -doped Ca-α-SiAlON phosphors (Ca m /2− x Si 12− m−n Al m+n O n N 16− n : x Eu) were synthesized by a freeze-drying assisted combustion synthesis (CS) route. Fast-synthesized products with high purity and uniform particle morphology were confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The analysis of lattice parameters by comparison with empirical equations showed that the as-prepared phosphors had low oxygen content. A series of samples were prepared according to the stoichiometry of Ca m /2−0.08 Si 12− m Al m N 16 :0.08Eu for further research. The influences of m value on the luminescence properties were investigated in detail. As m increased, a redshift phenomenon was observed in both the excitation and emission spectra. First-principle electronic structure calculations showed that the 3d energy level of Ca played an important role in the occurrence of the redshift phenomenon.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Analytical Methods
·
2026
·
IF 3
Jiajia Wang,Chun Kan,Demeng Qian,Mingping Gao,Ayang Zhou,Bao-Kang Jin
CA-125, as a tumor marker for ovarian cancer, plays an importance role for rapid and sensitive detection in early diagnosis. Herein, a label-free electrochemical immunosensor based on COF/PTh/MB nanocomposite was constructed for the detection of CA-125.The TAPB-DMTP-COF material, with its large surface area and stable porous framework, was used as the substrate. However, its poor conductivity hindered electron transfer. To address this, conductive polymer PTh was combined with the COF to enhance the composite's conductivity. Meanwhile, MB was used as a signal probe, and differential pulse voltammetry (DPV) was adopted to measure the electrochemical signal. Under optimized experimental conditions, the proposed immunosensor exhibited excellent performance for the CA-125 detection, with a detection range of 1 mU/mL-10000 mU/mL, and a low detection limit of 0.34 mU/mL (S/N = 3), providing a potential platform for clinical application.
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Tianyu Liu,Yunjie Cai,Tong Shen,Yunhan Wu,Qi Mu,Ranxue Chen,Zezhong Lin,Rongchao Xue,Chong Wang,Guiying Zhu
Polyvinyl chloride (PVC) is an important plastic material. How to enhance the stability of plasticizers in PVC materials is crucial. In this work, internal plasticization was achieved through the ring-opening polymerization (ROP) of polycaprolactone (PCL) grafted from the unsubstituted hydroxyl groups of cellulose acetate (CA). A series of hyperbranched copolymers (CA-HPCL) with CA acetate-rich hard core and PCL-rich soft shell were prepared. Under similar elongation at break conditions, PVC plasticized with CA-HPCL shows higher modulus, strength, and toughness than linear plasticized PVC and other traditional low-molar-mass plasticizers without hard cores. The obtained plasticized PVC material exhibits a high modulus of approximately 30 MPa while ensuring an elongation at break of more than 300%. Further DSC and FTIR characterizations, combined with a comparison with the linear C 5 H 12 O-PCL plasticizer, reveal that this high rigidity is attributed to the physical cross-linking effect of CA-HPCL on PVC chains. Meanwhile, the migration stability test shows that CA-HPCL exhibits excellent anti-migration properties in PVC matrix. The migration rates of all CA-HPCL-PVC samples are lower than 5%, which is only 0.072 times that of DOP-PVC. Therefore, such films with excellent flexibility, elongation and high modulus are expected to be widely applied in the medical industry.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Kaiwen Ma,Jian Sun,Rongyue Sun,Chuanwen Zhao
Lately, Ca-based sorbents with a core–shell structure have been effectively produced to augment the sorbent’s capabilities. However, modifying the pristine core of Ca-based pellets with a core–shell structure notably influences the performance of the synthesized sorbent, and research in this domain remains scarce. Here, two categories of Al-stabilized, Ca-based pristine cores were produced using Ca(OH) 2 mixed with Al-based stabilizer precursors of insoluble aluminum oxide and soluble aluminum nitrate, respectively, through the extrusion-spheronization technique. Due to the impact of mechanical extrusion, soluble aluminum nitrate can accumulate in-homogeneously in the Ca-based pristine core, leading to its expansion and rupture during the high-temperature calcination stage because of the decomposition of aluminum nitrate. The oxide-form aluminum stabilizer precursor can be uniformly distributed throughout the Ca-based pristine core pellets, demonstrating notably superior cyclic CO 2 sorption capability and mechanical strength. The Al-fortified, core–shell structured Ca-based sorbent pellets demonstrated a peak CaO carbonation conversion rate of 54.8 % after 100 cycles when the Ca:Al molar ratio was precisely set to 85:15, which is about 2.1 times higher compared to the core–shell Ca-based sorbent pellets composed of a pure CaO core. This is primarily due to the formation of an evenly distributed inert Ca 12 Al 14 O 33 within the pristine core, which effectively reduces high-temperature sintering. Hence, core–shell Ca-based sorbent pellet assembled with an Al-stabilized pristine core, could be a promising candidate for application in the CaL process for CO 2 capture.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
Fuels
·
2025
·Vol. 6
·期 4
·89
·
IF 2.8
Zhibing Shen,Ruiyuan Tang,Shengrong Liang,Juntao Zhang,Leyuan Li,Shangli Zhang
The conversion of polycyclic aromatic hydrocarbons (PAHs) to monocyclic aromatic hydrocarbons holds significant importance in the petrochemical and coal chemical industries, as it enables the production of high-value-added chemicals. In this study, we investigated the methane-assisted hydroconversion of PAHs to monocyclic aromatic hydrocarbons with methyl side chains over Zn-based catalysts from Hβ zeolites treated with citric acid (CA) at different concentrations. The CA-modified Hβ catalysts were characterized using X-ray diffraction (XRD), N2adsorption–desorption, pyridine–Fourier transform infrared spectroscopy (Py-FTIR), and ammonia temperature-programmed desorption (NH3-TPD). The results show that low CA concentrations facilitate the removal of amorphous aluminum from the zeolite framework, thereby increasing the specific surface area, pore volume, and pore diameter of the Zn/Hβ catalyst, as well as improving its Lewis/Brønsted (L/B) acid ratio. In contrast, excessive CA treatment causes the undesirable removal of framework aluminum and leads to structural collapse in the mesoporous regions formed at the interfaces between certain crystal aggregates. This, in turn, has a negative impact on the catalyst’s specific surface area, pore volume, pore size distribution, total acidity, and L/B ratio. Experimental data further indicate that the optimal Zn/Hβ catalyst, prepared using Hβ treated with 0.08 M CA, achieves a naphthalene conversion rate of up to 99% and a benzene–toluene–xylene (BTX) selectivity of 60% in the liquid product over a 10 h reaction period. These findings confirm that CA treatment not only enhances the catalytic activity of Zn/Hβ but also significantly improves its operational stability. This work provides new insights into the rational design of catalysts for the efficient conversion of PAHs to monocyclic aromatic hydrocarbons and the utilization of methane resources.
研究领域:
催化化学
·
石油化工
·
煤化工
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材料科学
·
多相催化
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产品关联
DOI
高影响因子
PHYTOMEDICINE
·
2025
·
IF 8.3
Shuhui Lei,Kaiqun Liu,Cong Liu,Ran An,Zilu Bao,Huan Zhang,Min Zou,Jianqiu Chen,HuiHui Zhang,Liangkai Wei,Zhou Lan,Lvyi Chen
s Background Inflammation is a vital biological defense mechanism, yet uncontrolled or prolonged inflammation can cause tissue damage. The NLRP3 inflammasome, a central component of innate immunity, drives inflammation by activating caspase-1 and promoting the release of cytokines like IL-1β. Monosodium urate (MSU) crystals are potent NLRP3 inflammasome activators implicated in diseases such as gout. While resveratrol, a natural polyphenol, exhibits anti-inflammatory properties, the specific mechanisms by which its cis-isomer (Cis-Resv) inhibits NLRP3 inflammasome activation remain poorly understood. Purpose This study aims to investigate the inhibitory effect of Cis-Resv on MSU-induced NLRP3 inflammasome activation and elucidate the underlying molecular mechanisms. Methods Bone marrow-derived macrophages (BMDMs) from C57BL/6J mice were stimulated with MSU crystals. The effects of Cis-Resv on IL-1β secretion, caspase-1 activation, and ASC oligomerization were evaluated using ELISA, Western blot, and immunoprecipitation, respectively. Transcriptomic analysis was employed to identify potential signaling pathways involved. The in vivo efficacy of Cis-Resv was assessed in MSU-induced acute gouty arthritis and air-pouch models by measuring joint swelling, inflammatory cytokines levels, and histopathological changes. Results Cis-Resv significantly inhibited MSU-induced NLRP3 inflammasome activation in BMDMs, reducing caspase-1 activation, IL-1β secretion, andassociated pyroptosis. Furthermore, Cis-Resv impeded ASC oligomerization, a critical step in inflammasome assembly. Transcriptomic analysis and subsequent functional validation revealed that Cis-Resv exerts these effects primarily through the TRPV4-Ca²⁺-phagocytosis-ROS signaling axis. Specifically, Cis-Resv inhibited macrophage TRPV4 channel activity, leading to decreased Ca²⁺ influx, impaired MSU crystal phagocytosis, and attenuated reactive oxygen species (ROS) accumulation. This reduction in ROS modulated the ROS-TXNIP pathway, diminishing the interaction between TXNIP and NLRP3, thereby suppressing inflammasome activation. In vivo , Cis-Resv effectively alleviated MSU-induced joint swelling, lowered IL-1β and TNF-α levels, and ameliorated histopathological damage in both gouty arthritis and air-pouch models. Conclusion Cis-Resv suppresses MSU-induced NLRP3 inflammasome activation by targeting the TRPV4-Ca²⁺-phagocytosis-ROS axis. This study identifies a novel mechanism and suggests Cis-Resv as a potential therapeutic agent for NLRP3-driven inflammatory conditions like gout.
研究领域:
免疫学
·
炎症研究
·
药理学
·
细胞生物学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Fang Wang,Xueyan Wu,Yuxuan Han,Yan Lv,Jixi Guo,Xiaoman Li,Yaping Zhang
In cement kiln flue gas emissions, high concentrations of alkali and alkaline earth metals cause the deactivation of the NbCe/Ti catalysts, significantly reducing their operational lifespan under industrial conditions. Here, the NbCe-loaded titanium nanotubes (NbCe/TiNTs) catalyst has been synthesized via hydrothermal and impregnation methods. The NbCe/TiNTs catalyst exhibits superior resistance to potassium (K) and calcium (Ca) poisoning. Notably, NbCe/TiNTs catalyst maintains high NOx conversion across a wide temperature range (192–350 °C). The 5Ca-NbCe/TiNTs and 3K-NbCe/TiNTs catalysts achieve a 90% NOx conversion at 235 and 242 °C, respectively, demonstrating remarkable resistance to K and Ca poisoning. The results indicate that TiNTs supports enhance both the specific surface area and surface acid sites of the catalyst, synergistically improving its resistance to K and Ca poisoning. Furthermore, an in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) study elucidates selective catalytic reduction with the NH3 (NH3-SCR) reaction mechanism, revealing dual contributions from both the Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) mechanisms on the catalyst. This work provides a research direction for enhancing the alkali poisoning resistance of NOx removal catalysts.
研究领域:
环境催化
·
材料科学
·
化学工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·Vol. 42
·期 33
·21167-21176
·
IF 3.582
Weizi Cai,Jiang Liu,Fangyong Yu,Qian Zhou,Yapeng Zhang,Xiaoqiang Wang,Meilin Liu,Meng Ni
Ca-loaded activated carbon is developed as fuel for direct carbon solid oxide fuel cells (DC-SOFCs), operating without any carrier gas and liquid medium. Ca is loaded on activated carbon through impregnation technique in the form of CaO, which exhibits excellent catalytic activity and significantly promotes the output performance of DC-SOFCs. DC-SOFCs fueled by activated carbon with different Ca loading content (0, 1, 3, 5 and 7 wt. %) are tested and the performances are compared with the DC-SOFC running on the conventional Fe-loaded activated carbon. It is found that the performance of the DC-SOFC with 5 wt. % (373 mW cm −2 ) and 7 wt. % (378 mW cm −2 ) Ca-loaded activated carbon is significantly higher than that of the cells operated on 5 wt. % Fe-loaded activated carbon, 1 wt. % and 3 wt. % Ca-loaded activated carbon. The discharging time and fuel utilization of the DC-SOFC with 5 wt. % Ca-loaded activated carbon are also the optimal ones among all the cells. The microstructure, element distribution and carbon conversion rate of the Ca-loaded carbon, the impedance spectra of the corresponding DC-SOFCs are measured. The reasons for the reduced fuel utilization of 7 wt. % Ca-loaded carbon fuel are analyzed and the advantage of Ca-loaded carbon for DC-SOFCs is demonstrated in detail.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Shunhang Wei,Guan Zhang,Xiaoxiang Xu
Despite a strong visible light absorbance as far as 660 nm, BaTaO 2 N generally exhibits a poor photocatalytic activity for water splitting under ordinary conditions. High levels of defects as well as photocatalytic self-decomposition are likely the major causes for this incommensuration. In this work, we have modified BaTaO 2 N by introducing Ca to the structure, i.e. BaCa x/3 Ta 1-x/3 O 2+y N 1-y (0 ≤ x, y ≤ 1). A number of important properties such as band gap, defects levels and nitrogen content can be tuned by varying the amounts of Ca in the structure. In particular, defects such as Ta 4+ species can be effectively suppressed by Ca incorporation. More importantly, photocatalytic activity for water oxidation has been significantly enhanced and stability against photocatalytic self-decomposition has also been largely improved in Ca modified BaTaO 2 N. An apparent quantum efficiency as high as ∼ 2.1% at 420 ± 20 nm has been achieved and stands as the highest AQE for BaTaO 2 N reported to date. Photoelectrochemical (PEC) analysis reveals a much higher photocurrent in Ca modified BaTaO 2 N and identifies the role of cocatalyst CoO z in reducing charge transfer resistance for water oxidation reactions. Open-circuit voltage decay (OCVD) measurements further confirm the improved charge separation conditions in Ca modified BaTaO 2 N and functions of cocatalyst CoO z in collecting and storing photo-generated holes. The optimal loading point for cocatalyst CoO z corresponds to the one that gives the highest capacity for hole storage.
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DOI
高影响因子
危险品化学品经营许可证（带存储）