CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Pengju Chen,Hao Zhang,Nan Zhou,Xian Tang,Yanquan Ouyang,Decai Peng,Tian Tian
A series of Nd-doped nanocrystalline Gd 2- x Nd x Hf 2 O 7 (GNHO, 0.0 ≤ x ≤ 2.0) ceramic samples, serving as nuclear waste forms, were synthesized via the sol-gel method combined with cold pressing and sintering. The microstructure, phase evolution, Raman spectral characteristics, and aqueous durability of these GNHO samples were systematically investigated. Results revealed that all GNHO samples formed a single pyrochlore structure sintering at 1673 K for 20 h. With the increase of x Nd from 0 to 2.0, the average grain size of the samples gradually increased from 162 nm to 294 nm, while their actual density gradually decreased from 8.21 to 7.83 g·cm -3 . After 42 days of testing, the normalized release rates of Nd and Hf elements in the Nd 2 Hf 2 O 7 sample were slightly lower than those of Gd and Hf elements in the Gd 2 Hf 2 O 7 sample. This observation can be attributed to the lower porosity of the Nd 2 Hf 2 O 7 specimen and the higher bond energy of Nd–O bond (∼753 kJ/mol) compared to that of Gd–O bond (∼716 kJ/mol). Furthermore, the normalized release rates of all investigated elements were below 10 −5 g·m -2 ·d -1 , exhibiting excellent aqueous durability. First-principles calculations further confirmed that Nd 2 Hf 2 O 7 ceramic exhibits higher structural stability than Gd 2 Hf 2 O 7 .
研究领域:
材料科学
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核化学
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无机非金属材料
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放射性废物处理
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固态化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 9
·6807-6813
·
IF 1.569
Guan Xiao Ying,Qiao Zhong Wang,Yan Deng Zhou,Sun Yan Fei,Li Jin
This study reports the effect of Nd-doping on structural, morphological and optical properties of BiFeO 3 synthesized by hydrothermal method. The X-ray diffraction’s results indicate that the samples possess single phase up to 12.5 % Nd doping at the Bi site, and all the samples were pure phase microcrystal having a perovskite structure with a space group of R3c. Through the scanning electron microscope, we find that the particles are nearly spherical morphology and the size decreases with Nd doping. The study of Fourier transform infrared spectroscopy confirms the formation of perovskite structure of prepared BiFeO 3 . Photoluminescence spectroscopy shows Nd doping enhanced the Photoluminescence intensity. Ultraviolet–visible absorption spectrum shows BiFeO 3 have a wide absorption band in 550–650 nm wavelength range. The corresponding energy band gap of the samples decreases with the increase of Nd-doping concentration. BiFeO 3 valence band electrons will be excited to the conduction band when the wavelength of visible light is 600–800 nm. It can be used in visible light catalysis. The value of remnant magnetization has improved due to the continuing collapse of the space-modulated spin structure of Bi 0.925 Nd 0.075 FeO 3 microcrystals.
研究领域:
材料科学
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凝聚态物理
·
纳米材料
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功能材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-13
·
IF 2.8
Lu Jiajun,Kong Wenwen,Xie Juntao,Zhao Yan,Zhao Qing,Chang Aimin
High-temperature thermistors face significant challenges in maintaining stability under extreme temperature conditions, meaning that stringent requirements for material selection and structural design are needed. To address this issue, negative temperature coefficient (NTC) thermistor ceramics of Ba 2 ReNbO 6 (Re = La, Nd, and Sm) were successfully prepared using the solid-state reaction method. X-ray diffraction (XRD) analysis revealed that Ba 2 ReNbO 6 (Re = La, Nd, and Sm) had an ordered double perovskite structure. Scanning electron microscopy (SEM) revealed that as the difference in cationic radii between B′/B″ decreased, the porosity of the materials gradually increased. After Ba 2 ReNbO 6 (Re = La, Nd, and Sm) underwent aging tests at 1173 K for 720 h, the resistance drift rates were 1.33, 3.80, and 5.88%, respectively, and the aging mechanism was explained using cation diffusion theory. These ceramics exhibited typical NTC characteristics over a wide temperature range from 773 to 1473 K, with the degree of linearity exceeding 0.999 for all the samples.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Kun Qian,Zhengjun Yao,Haiyan Lin,Jintang Zhou,Azhar Ali Haidry,Tongbaihui Qi,Wenjing Chen,Xinlu Guo
Nanocrystalline Ni–Zn ferrites with different neodymium contents (Ni 0.5 Zn 0.5 Nd x Fe 2-x O 4 ) were synthesized by sol-gel route combined with self-propagating combustion (SPC) method. The presence of surface functional groups, crystal structure and morphology of the samples were studied by FT-IR, XRD and SEM. The results show that the prepared samples are composed of spinel phase under the condition of low neodymium content, like the pure Ni–Zn ferrite. While neodymium oxide appears after the content of Nd 3+ exceeds a certain limit (x > 0.04) and there exist two phases in the ferrite. The results of vibrating sample magnetometer (VSM) and vector network analyzer (VNA) show that adjusting the content of Nd is significant in improving the dielectric properties and microwave absorption capacity of the materials, specifically at low frequencies. When x < 0.04, the enhancement of dielectric loss ability of spinel ferrites by doping Nd 3+ is the dominant factor affecting microwave absorption ability of samples. The secondary phase Nd 2 O 3 hardly appears under this condition, thus the weakening effect of Nd 3+ addition on magnetic loss ability is not obvious. When x = 0.04, the optimal absorption peak of the material reaches −20.8 dB at 4.4 GHz with a thickness of 8.5 mm and the effective absorption bandwidth (R L < −10 dB) was 3.2 GHz. On the contrary, when x > 0.04, the magnetic loss ability decreases rapidly (e.g., Ms decreases from 82.47 emu/g to 59.77 emu/g). Meanwhile, the dielectric loss increases slowly and the microwave absorption capacity decreases.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 12
·1-16
·
IF 2.8
Wang Fenglin,Mao Haijun,Chen Xingyu,Li Wei,Liu Zhuofeng,Zhang Weijun,Bai Shuxin
In this work, A -site Nd doped BaTiO 3 ceramics in the form of Ba 1− x Nd 2 x /3 TiO 3 with a wide substitution level range of x = 0–0.2 have been prepared via solid-state reaction method. Powder X-ray diffraction results reveal that Nd is completely incorporated into the BaTiO 3 lattice in all specimens. Further analyses based on Rietveld refinement suggest that tetragonal and pseudo-cubic phases coexist in Ba 1− x Nd 2 x /3 TiO 3 ceramics with x ≤ 0.06, and the amount of tetragonal phase is raised with the increase of x value. When x value is larger than 0.08, only pseudo-cubic is observed. The generated \(V^{\prime\prime}_{{{\text{Ba}}}}\) , \({\text{Nd}}_{{{\text{Ba}}}}^{\cdot }\) and \(V_{{\text{O}}}^{{\cdot \cdot }}\) defects, which are identified by X-ray photoelectron spectra, make the grain size displays a tendency of decrease first mainly due to the pining effect, and then increase ascribed to the accelerate of mass diffuse. By introducing such wide range of substitution level, Ba 1− x Nd 2 x /3 TiO 3 ceramics with colossal dielectric constant ( x = 0.08), temperature-stable dielectric properties ( x = 0.15), especially relaxor behavior ( x = 0.20) noticed for the first time, are, respectively, received, which is closely related to the variation of phases and defects induced by the addition of Nd. This study may provide a special idea to modify BaTiO 3 to satisfy diversified applications by single element with a wide doping range, and could lay the foundation of future works focusing on the various potential applications of Ba 1− x Nd 2 x /3 TiO 3 ceramics.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Shaoxiong Feng,Weigang Ding,Yan Zhang,Jingwei Wu,Zhiming Zou,Tongfa Wu,Qun Tang
A novel neodymium-based metal-organic framework (Nd-MOF) {[Nd 2 (Hpdc) 3 (H 2 O) 6 ]·3H 2 O} n (H 3 pdc = 1H-pyrazole-3,5-dicarboxylic acid) was synthesized by a simple hydrothermal method and structurally characterized. By dropped onto glassy carbon electrodes (GCE), the prepared Nd-MOF was applied to construct an efficient electrochemical sensor for the rapid and reliable electrochemical detection of Rhodamine B (RhB). This proposed Nd-MOF/GCE sensor exhibited strong accumulation ability and high electrocatalytic activity for RhB. Electrochemical oxidation signal of RhB at the Nd-MOF/GCE was greatly enhanced as compared to that at the bare GCE. The effective factors such as pH of buffer solution , amount of Nd-MOF suspension and accumulation time were optimized for the quantitative detection of RhB. Under optimum conditions, the fabricated sensor showed two wide linear ranges of 0.08–2.0 and 2.0–40 μM with a low detection limit of 3.6 nM, which was ascribed to the advantages of Nd-MOF such as large specific surface area, multiple active sites, strong accumulation ability. Moreover, the developed Nd-MOF/GCE sensor displayed good selectivity and accuracy towards RhB detection in the actual samples. Thus, this simple and efficient approach for RhB detection has good prospective for application in environmental monitoring.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
Cell Communication and Signaling
·
2023
·Vol. 21
·期 1
·1-17
·
IF 8.4
Zhao Weiming,Wang Lan,Yang Juntang,Chen Xinyu,Guo Xiaoshu,Xu Kai,Wang Ningdan,Zhao Wenyu,Xia Cong,Lian Hui,Rosas Ivan,Yu Guoying
Background Matrix metalloproteinases (MMPs) play important roles in remodeling the extracellular matrix and in the pathogenesis of idiopathic pulmonary fibrosis (IPF). MMP19, which is an MMP, was significantly upregulated in hyperplastic alveolar epithelial cells in IPF lung tissues and promoted epithelial-mesenchymal transition (EMT). Recent studies have demonstrated that endothelial-to-mesenchymal transition (E(nd)MT) contributes to pulmonary fibrosis. However, the role of MMP19 in pulmonary vascular injury and repair and E(nd)MT remains unclear. Methods To determine the role of MMP19 in E(nd)MT and pulmonary fibrosis. MMP19 expressions were determined in the lung endothelial cells of IPF patients and bleomycin (BLM)-induced mice. The roles of MMP19 in E(nd)MT and endothelial barrier permeability were studied in the MMP19 cDNA-transfected primary human pulmonary microvascular endothelial cells (HPMECs) and MMP19 adenoassociated virus (MMP19-AAV)-infected mice. The regulatory mechanism of MMP19 in pulmonary fibrosis was elucidated by blocking its interacting proteins SDF1 and ET1 with AMD3100 and Bosentan, respectively. Results In this study, we found that MMP19 expression was significantly increased in the lung endothelial cells of IPF patients and BLM-induced mice compared to the control groups. MMP19 promoted E(nd)MT and the migration and permeability of HPMECs in vitro, stimulated monocyte infiltration into the alveolus, and aggravated BLM-induced pulmonary fibrosis in vivo. SDF1 and Endothelin-1 (ET1) were physically associated with MMP19 in HPMECs and colocalized with MMP19 in endothelial cells in IPF patient lung tissues. AMD3100 and bosentan alleviated the fibrosis induced by MMP19 in the BLM mouse model. Conclusion MMP19 promoted E(nd)MT by interacting with ET1 and stimulated monocyte infiltration into lung tissues via the SDF1/CXCR4 axis, thus aggravating BLM-induced pulmonary fibrosis. Vascular integrity regulated by MMP19 could be a promising therapeutic target for suppressing pulmonary fibrosis.
Video abstract
研究领域:
呼吸病学
·
细胞生物学
·
分子生物学
·
病理学
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产品关联
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2023
·Vol. 54
·期 4
·1675-1686
·
IF 3
Fu Yingzheng,Zhang Zhimin,Lu Xuchen,Yan Yan,Pan Binfeng
To increase the reaction driving force and prepare Mg–Nd master alloys, the synergistic interaction between NdCl 3 and NdF 3 was used in the magnesiothermic reduction process in NdCl 3 –NdF 3 -containing molten salt. Thermomechanical analysis was used to investigate the possibility of the synergistic interaction in molten salt. Then the verification of synergistic interaction was conducted by analyzing the composition of the molten salt and the alloys obtained in the magnesiothermic reduction process. After that, the factors affecting synergistic interaction were investigated. At last, the mechanism of the synergistic interaction between NdCl 3 and NdF 3 in molten salt was proposed and discussed. The coupling reaction formed in the magnesiothermic reduction process and the existence of three reaction mechanisms increased the reaction driving force. Mg–RE master alloys with the content of Nd being 25 to 30 wt pct were prepared under the optimum conditions and the conversion rate of NdF 3 was greater than 70.94 pct. The content of Nd and the content of various impurities in the alloys obtained both met the requirements of the commercial Mg–Nd master alloys.
研究领域:
材料科学
·
冶金学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2012
·
IF 1.693
Xiao-Ming Peng,Yu-Feng Hu,Jin-Zhu Zhang,Zhi-Xin Wang,Zhe-Yu Li,Chao Miao
Viscosities were measured for the ternary systems Y(NO3)3 + Ce(NO3)3 + H2O, Y(NO3)3 + Nd(NO3)3 + H2O, and Ce(NO3)3 + Nd(NO3)3 + H2O and their binary subsystems Y(NO3)3 + H2O, Ce(NO3)3 + H2O, and Nd(NO3)3 + H2O at (293.15, 298.15, and 308.15) K and atmospheric pressure. The results were used to test the applicability of simple equations for the viscosity of mixed solutions. The predictions agree well with measured values, implying that the viscosities of the examined electrolyte solutions can be related to those of their constituent binary solutions using these simple equations.
研究领域:
化学
·
物理化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qing Liu,Huifang Xing,Yan Zhang,Yunze Zhao,Meng Rong,Huizhou Liu,Liangrong Yang
The metatitanic acid H 2 TiO 3 (HTO) with high selectivity shows potential in lithium extraction from salt lake brine. Nevertheless, the sluggish adsorption kinetics and unsatisfying actual adsorption capacity hinder H 2 TiO 3 industrial application. Herein, a rare earth element Nd-doped H 2 TiO 3 (Nd-HTO-1 %) was synthesized. The crystallinity, morphology, hydrophilicity, adsorption property and mechanism of Nd-HTO-1 % were systematically characterized by a series of techniques. Interestingly, Nd-doping promotes the generation of oxygen vacancies, thereby increasing the density of surface hydroxyl groups and making the surface high-hydrophilic and particle size decreased. After 1 % Nd-doping, high-hydrophilic HTO was obtained with a contact angle of 16.5°. The adsorption capacity of Nd-HTO-1 % increased by 12.5 % compared with HTO, and the equilibrium time of adsorption reduced by half to 4 h. After eight cycles, Nd-HTO-1 % still showed a considerable adsorption capacity of 39.69 mg·g −1 . In the meantime, the dissolution loss of titanium is merely 0.14 %, showing excellent cycling stability. Combined with the considerable selectivity exhibiting in Qarhan salt lake brine, it demonstrates potential in utilization of Nd-doped H 2 TiO 3 for lithium extraction from salt lake brine.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 4
·3274-3280
·
IF 2.22
Du Kang,Zou Zheng-Yu,Song Xiao-Qiang,Fan Jun,Lu Wen-Zhong,Lei Wen
Novel Ca RE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) microwave dielectric ceramics were prepared using solid-state reaction sintered at 1350–1400 °C for 5 h. CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) possessed an apatite structure with the P 6 3 /m space group. The lattice parameters a , b and c ; theoretical density and unit cell volumes of CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) gradually decreased when RE changed from La to Er, and a pure phase was formed at all compositions. The ε r , Q × f , and τ f values of the CaRE 4 Si 3 O 13 (RE = La, Nd, Sm, and Er) ceramics were related to the total ionic polarizability, packing fraction, and polyhedral distortion of RE/Ca(2)O 7 , respectively. The optimal microwave dielectric properties of the CaRE 4 Si 3 O 13 ceramics ( ε r = 13.37, Q × f = 18,600 GHz, and τ f = − 17.8 ppm/°C) were obtained at RE = Er.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Small
·
2026
·
IF 11.8
Guangyue Liu,Lifang Chen,Zhenyu Liu,Jingchao Chen,Ruimin Ding,Xi Yin
Proton-exchange-membrane water electrolysis (PEMWE) demands high-performance anodes with minimal iridium content, yet conventional Ir-based catalysts suffer from an inherent activity-stability trade-off. We address this challenge by designing neodymium-doped amorphous IrO x catalysts (Nd-IrO x ) that enable precise control over short-range structure to activate the oxide path mechanism (OPM). Incorporating Nd 3+ into an amorphous IrO x matrix dominated by edge-sharing [IrO 6 ] octahedra optimizes the prerequisites for the OPM: lattice distortion tailors Ir-Ir distances to enable direct *O-O* coupling, while electronic modulation stabilizes OH ligands within the local coordination environment, facilitating *O formation. The optimized Nd-IrO x catalyst delivers an ultralow acidic OER overpotential of 254 mV at 10 mA cm −2 with 520 h of stability. Remarkably, PEMWE employing an ultralow Ir-loading anode (0.5 mg Ir cm −2 ) achieves a DOE-relevant current density (4 A cm −2 at 1.9 V) and remarkable 1000-h stability at 1 A cm −2 . This work pioneers short-range engineering in Ir-based oxides, offering fundamental insights for catalyst design and OER pathway control toward efficient hydrogen production.
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DOI
PubMed
高影响因子
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