CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yu Han,Jingkai Nie,Xiaochuan Huang,Xuan Li,Shaofeng Zhang,Zhen Xu,Donghui Wang,Qiang He,Jian Zhou,Ran Xu
The tungsten-bronze-type Ba 6-3x Sm 8+2x Ti 18 O 54 ceramic materials exhibit fantastic application potential in electronic devices owing to their superior microwave dielectric properties. However, the huge challenge of realizing high dielectric constant accompanied by ultralow dielectric loss still exists and has become a critical bottleneck impeding the operation of multilayer ceramic capacitors (MLCCs) and capacitive voltage dividers in the low-frequency range. Herein, we report high dielectric constant and ultralow dielectric loss performance of Ba 4 (Sm 1-x-y Bi x Nd y ) 9.333 Ti 18 O 54 (0.3≤x ≤ 0.4, 0.1≤y ≤ 0.2) ceramics via A-site modification strategy of Bi/Nd co-substitution. A high dielectric constant of 115 and ultralow loss tangent of 0.003 at 1 kHz are achieved simultaneously in Ba 4 (Sm 1-x-y Bi x Nd y ) 9.333 Ti 18 O 54 ceramics with x = 0.4 and y = 0.2. Incorporating an appropriate amount of Bi 3+ ions contributes to enhancing the dielectric polarizability of the crystal lattice, and greatly strengthening the sintering ability of ceramics as well as local distortion characteristics, leading to an improvement in the dielectric constant and ultimately a deterioration in the loss tangent, which is confirmed by XRD, Raman, SEM and Impedance spectroscopy. The Bi/Nd co-substitution has a significant impact on further improving the dielectric constant, and the compensation of the loss tangent value mainly is derived from the conduction loss with the reduction of leakage currents. Moreover, the high recoverable energy density of 1.2 J/cm 3 and energy efficiency of 87%, as well as excellent temperature (25∼180 °C) and frequency (1∼140 Hz) stability, are obtained in this ceramic owing to high breakdown strength via A-site modification strategy of Bi/Nd co-substitution. These findings establish an effective strategy of Bi/Nd co-substitution to develop highly reliable Ba 4 Sm 9.333 Ti 18 O 54 ceramics, opening a new path for creating next-generation dielectric materials tailored for stable energy storage in high-voltage, low-frequency electronics.
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高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Tao Jiang,Ming Cheng,Yujiao Wang,Shaoqiang Guo,Wentao Zhou,Yafei Wang
The selective removal of neutron-absorbing fission products from spent nuclear fuel is critical for enhancing neutron economy and enabling efficient recycling. In this work, we present a novel two-step dry reprocessing strategy that integrates NH 3 /HCl gas mixture treatment with liquid Sn extraction to achieve phase-selective separation of Sm, Nd, Ru, Rh, and Pd from simulated U 3 O 8 -based spent fuel. Thermodynamic analysis and experimental validation reveal that decomposition of NH 4 Cl at elevated temperatures serves as the generator of NH 3 /HCl gas mixture capable of selectively chlorinating Sm 2 O 3 and Nd 2 O 3 into soluble chlorides while reducing U 3 O 8 to UO 2 and converting RuO 2 , Rh 2 O 3 , and PdO to their metallic states (Ru, Rh, Pd). Subsequent dissolution tests in LiCl-KCl confirm that Sm and Nd are almost completely removed, with chlorination efficiencies of nearly 100%, while uranium loss can be minimized by controlling direct NH 4 Cl contact. The coupled liquid Sn extraction at 1173 K enabled the recoveries of metallic Rh, Rh, and Pd with a promising extraction efficiency. This integrated approach significantly simplifies the partitioning of key neutron poisons (Sm, Nd, Ru, Rh, Pd) compared to conventional aqueous or pyrochemical routes, reduces secondary waste, and preserves uranium in its UO 2 form.
研究领域:
核化学
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放射化学
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核燃料循环
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材料化学
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湿法冶金
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热力学分析
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yilin Wu,Rongxin Lin,Faguang Ma,Wendong Xing,Jianming Pan
Three-dimensional (3D) basswood materials, for the first time, were successfully used for the construction of rare-earth Nd(III)-imprinted nanocomposite membranes. Herein, polydopamine (PDA)-modified layers could be initially synthesized on basswood surfaces. After the double-bonded modification procedure, the 3D wood-based ionic imprinted membranes (3DW-IIMs) system was finally accomplished by developing a re-modified two-step-temperature free radical polymerization process. The as-design PDA@basswood surface structure was first proposed and applied as imprinting-initiated factors for the preparation of Nd(III)-imprinted sites. Importantly, excellent rebinding capacity (120.87 mg g −1 ), adsorption kinetics and permselectivity coefficients (more than 10) were achieved successfully. Furthermore, an important research result had also been found that the PDA-modified layers caused significant promotions to the rebinding capacities of the as-prepared 3DW-IIMs, that is to say, more and more Nd(III)-imprinted sites could be synthesized because of the PDA-modified surfaces. The as-obtained selective rebinding and separation results together with the green natural wood-based materials strongly demonstrated that our synthesis methodology of 3DW-IIMs had great potential for applications in various fields of rare earth separation, chemical industry, and environment protection.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Siqi Zhang,Shuopan Dun,Xugeng Guo,Jinglai Zhang
Introducing upconversion nanoparticles (UCNPs) or fabricating TiO 2 hollow spheres (TiO 2 -HSs) are considered two feasible strategies to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). However, studies investigating a combination of UCNPs and TiO 2 -HSs for the application in DSSCs are still scarce. In this contribution, NaYF 4 :Yb,Er@NaGdF 4 :Nd@SiO 2 UCNPs and TiO 2 -HSs were synthesized and respectively applied as upconversion layers and scattering layers on the TiO 2 photoanode of DSSCs. The influence of different doping ratios of UCNPs on cell performance was explored. The present results reveal that the DSSCs device based on conventional P25 photoanode films incorporating the UCNPs with 10% can achieve a photovoltaic efficiency of 6.65%, showing 29.63% enhancement in comparison to the device without UCNPs. When the TiO 2 -HSs are used as scattering layers above the P25 film, the DSSCs device obtains a higher photovoltaic efficiency of 6.97%. More importantly, combining the UCNPs and TiO 2 -HSs can further enhance the photoelectrical property of DSSCs, realizing an optimal efficiency of 8.17%. Such an improvement can be attributed to a synergistic mechanism arising from the upconversion effect of UCNPs and the light scattering effect of TiO 2 -HSs. This work opens a new way of preparing composite photoanode films to improve the photovoltaic performances of DSSCs.
研究领域:
材料科学
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能源科学
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Luo Feng,Liqing Li,Meiqi Zhang,Yijie Yang,Xiaoqi Sun
This paper reports the syntheses of a series of polychromatic pigments with the general formula LiAl 1- x M x (MoO 4 ) 2 (M = Fe, Pr, Ho, Nd, Er, Ce; x = 0–0.4) and the characterization of near-infrared reflectance properties. The synthesized pigments exhibited green (Pr), lavender (Nd), pink (Er) and different yellows (Fe, Ho, Ce). The XRD patterns of typical LiAl 1- x Fe x (MoO 4+δ ) 2 samples show that the prepared samples are triclinic lithium aluminum molybdate structures with space group P -1.The iron in the sample mainly existed in the form of Fe 3+ , which led to the directional growth of grains with different morphologies. The near-infrared solar reflectance (R*%) of LiAl 1- x Fe x (MoO 4 ) 2 pigments reached 94.19%. As the doping concentration of rare earth was increased, the color of the pigments gradually deepens. By introducing rare earth elements Pr, Ho, Nd, Er, and Ce into the LiAl(MoO 4 ) 2 matrix, the color of the pigment was successfully changed from white to green, lavender, pink, and yellow, indicating that doping can control the color of the pigment. Moreover, the prepared pigments had high R*% (>87%), indicating that the pigment samples have excellent thermal insulation properties and can be used as a new type of reflective thermal insulation coatings.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Kasi Gopinath,Sathishkumar Gnanasekar,Khalid A. Al-Ghanim,Marcello Nicoletti,Marimuthu Govindarajan,Ayyakannu Arumugam,Chinnasamy Balalakshmi,Sarinthip Thanakkasaranee
In the present study, Neodymium (Nd), Cadmium (Cd), and the various molar ratios of Nd: Cd doped copper oxide nanocomposites (CuO NCs) were prepared by the co-precipitation method. The as-synthesized Nd, Cd, and Nd:Cd doped CuO NCs [Cu 1-x + y Nd x Cd y O, (x:y = 0.006:0.00, 0.00:0.006, 0.005:0.001, 0.004:0.002, 0.003:0.003, M)] were characterized through various instrumentation techniques such as TGA , UV–Vis–NIR, FTIR, Raman, FL, XRD , ZP , FE-SEM with EDAX elemental mapping, HR-TEM and XPS analyses. Further, the antibacterial activity of doped CuO NCs was tested against Staphylococcus aureus and Escherichia coli . An equal molar ratio of Nd and Cd doped CuO NCs showed excellent antibacterial activity mainly due to the synergistic effect of sufficient Nd 3+ , Cd 2+ , and Cu 2+ ions releasing ability . Interestingly, the doping effect enhances surface defects and decreases the ability to scavenge free radicals compared to pure CuO nanomaterials . At the same time, the cytotoxicity of NCs was evaluated on the human lung epithelial L132 cell line. Evidently, 75 μg/ml concentration of Nd:Cd doped CuO NCs samples shows 80% viability, which confirms their negligible cytotoxic effect. The Nd:Cd doped CuO NCs (94:3:3) had a high aspect ratio shape, remarkable ion-releasing ability, and biocompatibility while being thermally stable. Because of these qualities, they are well suited for treating bacterial infections in the biomedical area.
研究领域:
材料科学
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生物学
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医学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Youhuan Gong,Dong Wu,Xiaojie Yan,Qian Zhang,Wenfu Zheng,Bin Li,Huanwen Chen,Le Wang
The threat of drug-resistant bacteria is challenging, and it is urgent to explore new antibiotics. Gold nanoparticles (AuNPs) are known to be a group of promising antibacterial agents for replacing conventional antibiotics. Nevertheless, their antibacterial mechanism remains to be elucidated. Herein, we directly observed the interaction between antibacterial AuNPs and bacteria at the molecular level using neutral desorption extractive electrospray ionization mass spectrometry (ND-EESI-MS). We monitored and analyzed the dynamic changes of bacterial metabolites in real time after AuNP treatment. Ten substances representing 3 major metabolic pathways, including protein and nucleic acid synthesis, energy metabolism, and quorum sensing, were identified, indicating that AuNPs may exert antibacterial effects through multiple mechanisms influencing bacterial metabolism and communication. This study deepens the understanding of the antibacterial mechanism of AuNPs and is insightful for designing and screening new antibacterial agents.
研究领域:
纳米技术
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微生物学
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分析化学
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药学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2023
·
IF 5
Jicheng Cui,Wenjing Zhao,Jiangtao Wu,Dongmei Zhang,Longguang Liu,Hui Qiao,Zeyu Yan,Yuejun Fu,John F. Trant,Yingqi Li
Combination chemotherapy can slow the emergence of resistance, but can also lead to a significant exacerbation of off-target effects. Mediated drug release can ameliorate this situation: in this study, mitoxantrone (MTO) and doxorubicin (DOX) were co-loaded onto a nanodiamond (ND) scaffold, through physical adsorption, to prepare an ND/MTO/DOX (NMD) nanodrug. The drug loading of MTO and DOX were 119 ± 3 μg mg −1 and 60 ± 3 μg mg −1 , respectively. This NMD exhibits excellent stability with negligible drug leakage upon storage. The NMD nanoparticles enter cells via the clathrin and caveolae co-mediated endocytosis pathways and primarily remain within the lysosomes. Cytotoxicity tests showed that the NMD has an enhanced synergistic effect compared with an ND loaded with either drug alone, and has a slow but effective rate of drug release. Intraperitoneal injection of the NMD-drug into tumor-bearing mice demonstrated that the NMD rapidly localizes to the tumor site with very limited dispersion to other organs. The NMD strongly suppressed tumor growth in vivo with significantly reduced toxic side effects compared to mice treated with the free drugs. These results suggest that the as-prepared NMD has potential clinical applications for the targeted co-delivery of multiple chemotherapeutics.
研究领域:
药学
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纳米技术
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癌症研究
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药物递送系统
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生物医学工程
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DOI
高影响因子
Minerals
·
2021
·Vol. 11
·期 1
·61
·
IF 2.644
Wenjie Zhang,Xian Xie,Xiong Tong,Yunpeng Du,Qiang Song,Dongxia Feng
Solvent extraction is the most widely used method for separation and purification of rare earth elements, and organic extractants such as di(2-ethylhexyl) phosphoric acid (P204) and di(1-methyl-heptyl) methyl phosphonate (P350) are most commonly used for industrial applications. However, the presence of impurity ions in the feed liquid during extraction can easily emulsify the extractant and affect the quality of rare earth products. Aluminum ion is the most common impurity ion in the feed liquid, and it is an important cause of emulsification of the extractant. In this study, the influence of aluminum ion was investigated on the extraction of light rare earth elements by the P204-P350 system in hydrochloric acid medium. The results show that Al3+competes with light rare earths in the extraction process, reducing the overall extraction rate. In addition, the Al3+stripping rate is low and there is continuous accumulation of Al3+in the organic phase during the stripping process, affecting the extraction efficiency and even causing emulsification. The slope method and infrared detection were utilized to explore the formation of an extraction compound of Al3+and the extractant P204-P350 that entered the organic phase as AlCl[(HA)2]2P350(o).Keywords:Al3+;light rare earths;P204;P350;impurity
研究领域:
化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Jingfang Tong,Weijie Lin,Ruixin Guo,Zhongzheng Deng,Haitao Zhou,Shu Guo,Xiaojun Kuang
Strong magnetic anisotropy in low-dimensional magnets leads to a significant rotating magnetocaloric effect, presenting new opportunities for the exploration of more efficient and streamlined refrigeration systems. In this study, we have successfully synthesized a series of centimeter-scale rare-earth-containing fluorocarbonates, K 4 RE 2 (CO 3 ) 3 F 4 ( RE = Ce, Pr, Nd, Sm, Eu, Tb, and Dy) through a supercritical hydrothermal method, featuring unique RE 2 O 12 F 4 magnetic dimers. The above materials' fundamental magnetism has been systematically investigated, and no long-range magnetic transitions were captured above 1.8 K. Based on the low-temperature specific heat results, the long-range magnetic ordering was found around 0.84 K and 0.97 K for K 4 Tb 2 (CO 3 ) 3 F 4 and K 4 Dy 2 (CO 3 ) 3 F 4 , respectively. Furthermore, the anisotropic magnetism of K 4 Tb 2 (CO 3 ) 3 F 4 and K 4 Dy 2 (CO 3 ) 3 F 4 reveals significant magneto-crystalline anisotropy, with the magnetic field ( B ) aligned along the RE 2 O 12 F 4 magnetic dimer, which acts as the easy magnetic axis. The maximum rotating field entropy change, − Δ S R max for K 4 Tb 2 (CO 3 ) 3 F 4 reaches approximately 9 J kg -1 K -1 around 17 K, while for K 4 Dy 2 (CO 3 ) 3 F 4 , it is approximately 5.5 J kg -1 K -1 near 11 K, both under a 7 T field applied along the c -axis. These findings highlight the potential of these compounds for magnetic refrigeration applications through a rotating crystallographic direction.
研究领域:
材料科学
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物理学
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DOI
高影响因子
INFLAMMATION
·
2024
·
IF 4.5
Liu Yadong,Zhang Guiqi,Wu Jiani,Meng Yi,Hu Jianyu,Fu Hao,Yang Dongfang
Intervertebral disc degeneration (IDD) diseases are common and frequent diseases in orthopedics. The caspase recruitment domain (CARD) and membrane-associated guanylate kinase-like protein 3 (CARMA3) is crucial in the activation of the NF-κB pathway. However, the biological function of CARMA3 in IDD remains unknown. Here, CARMA3 expression was elevated in nucleus pulposus (NP) tissues of IDD rats and nutrient deprivation (ND)-induced NP cells. The main pathological manifestations observed in IDD rats were shrinkage of the NP, reduction of NP cells, fibrosis of NP tissues, and massive reduction of proteoglycans. These changes were accompanied by a decrease in the expression of collagen II and aggrecan, an increase in the expression of the extracellular matrix (ECM) catabolic proteases MMP-3, MMP-13, and metalloprotease with ADAMTS-5, and an increase in the activity of the pro-apoptotic protease caspase-3. The expression of p-IκBα Ser32/36 and p-p65 Ser536 was also upregulated. However, these effects were reversed with the knockdown of CARMA3. Mechanistically, CARMA3 bound to BCL10 and MALT1 to form a signalosome. Knockdown of CARMA3 reduced the CARMA3-BCL10-MALT1 signalosome-mediated NF-κB activation. CARMA3 activated the NF-κB signaling pathway in a manner that bound to BCL10 and MALT1 to form a signalosome, which affects NP cell damage and is involved in the development of IDD. This supports CARMA3-BCL10-MALT1-NF-κB as a promising targeting axis for the treatment of IDD.
研究领域:
骨科
·
分子生物学
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细胞生物学
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病理学
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Hu Kejun,Li Qing,Song Dongsheng,Jia Yingze,Liang Zhiyao,Wang Shuai,Du Haifeng,Wen Hai-Hu,Ge Binghui
The recent discovery of superconductivity in infinite-layer nickelate films has sparked significant interest and expanded the realm of superconductors, in which the infinite-layer structure and proper chemical doping are both of the essence. Nonetheless, the reasons for the absence of superconductivity in bulk infinite-layer nickelates remain puzzling. Herein, we investigate atomic defects and electronic structures in bulk infinite-layer Nd 0.8 Sr 0.2 NiO 2 using scanning transmission electron microscopy. Our observations reveal the presence of three-dimensional (3D) block-like structural domains resulting from intersecting defect structures, disrupting the continuity within crystal grains, which could be a crucial factor in giving rise to the insulating character and inhibiting the emergence of superconductivity. Moreover, the infinite-layer structure, without complete topotactic reduction, retains interstitial oxygen atoms on the Nd atomic plane in bulk nickelates, possibly further aggravating the local distortions of NiO 2 planes and hindering the superconductivity. These findings shed light on the existence of structural and atomic defects in bulk nickelates and provide valuable insights into the influence of proper topotactic reduction and structural orders on superconductivity.
研究领域:
材料科学
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凝聚态物理
·
超导
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DOI
高影响因子
危险品化学品经营许可证（带存储）