Russian Journal of Physical Chemistry A
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2022
·Vol. 96
·期 5
·1077-1084
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IF 0.791
Huang Feng-Yu,Wang Zhe,Yi Fa-Cheng,Liu Yan,Wu Ya-Dong,Luo Ying,Jia Wen-Jing
Abstract A local bentonite from Gaomiaozi county (Inner Mongolia province, China) was purified, and the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscope (SEM) were used for the characterization of the purified sample to determine its chemical constituents and microstructures. The sorption behavior of Nd(III) on bentonite was performed by batch technique, and the effects of contact time, clay dosage, pH, ionic strength and temperature were investigated. The results indicated that sorption of Nd(III) on bentonite was strongly dependent on pH values, suggesting that surface complexation was the main sorption mechanism in the sorption process. The sorption isotherm fitted well by Langmuir models. The thermodynamic parameters, such as, enthalpy (∆ H °), entropy (Δ S °), and Gibbs free energy (Δ G °) were calculated from the temperature dependent sorption data, and the results indicated that the sorption of Nd(III) on bentonite was a spontaneous process, and the sorption was endothermic.
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OPTICAL MATERIALS
·
2016
·
IF 2.183
Pande Zhang,Benxue Jiang,Jintai Fan,Xiaojian Mao,Long Zhang
Cr and Nd co-doped laser ceramics, as the potential gain materials in inertial confinement fusion (ICF), have been widely investigated. And the study on valence states of chromium ions is important. The effects of sintering additives and annealing atmosphere on the valence state of chromium were studied in detail, and the results shown that the Cr valence states were demonstrated to be Cr 2+ and Cr 3+ ions in HIP-sintered Cr(0.2 at.%), Nd(0.8 at.%): LuAG laser ceramics. And the intensity of the near-infrared absorption band caused by Cr 2+ ions was attenuated with the decreasing SiO 2 concentration and increasing MgO amount. The near-infrared absorption could be eliminated by annealing in air. And the transformation of valence states of Cr ions in the Cr,Nd:LuAG ceramics were also confirmed by electron paramagnetic resonance and X-ray photoelectron spectroscopy.
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Nature Communications
·
2025
·Vol. 16
·期 1
·10998
·
IF 15.7
Feng Yong,Wang Jianhua,Feng Kun,Xu Bai,Xu Jiabin,Li Shuo,Lu Cheng,Fan Xing,Lin Haiping,Zhong Jun
Proton-exchange membrane water electrolysis in acidic solutions holds great promise for advancing the green-hydrogen economy but limited by using precious-metal catalysts. Here, we develop a low-cost Co 3 O 4 -based catalyst with oxygen vacancies and Nd-insertion (Nd-CoO x ). This catalyst achieves a low overpotential of 317 mV at 10 mA cm −2 for acidic oxygen evolution reaction and remains stable over 800 h. The oxygen vacancies in Nd-CoO x enhance its catalytic activity, while Nd enables the long-term stability through a flexible “breathing mode” during oxygen evolution reaction, as revealed by in-situ methods such as X-ray absorption spectroscopy and Raman spectroscopy. The presence of Nd also improves the catalytic activity with the oxide path mechanism. This favorable strategy can be extended to other lanthanides. When used as the anode, Nd-CoO x delivers good performance in water electrolysis to achieve 200 mA cm −2 at a low cell voltage of 1.69 V with low degradation over 100 h, and can reach 1 and 2 A cm −2 at 1.93 V and 2.12 V, respectively.
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JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Ruoming Wang,Yanbei Liu,Yuzheng Lu,Sining Yun
Limited catalytic activity and inefficient ionic transport are major obstacles that compromise the overall performance of low-temperature fuel cells. To address this, we present a novel dual-regulation strategy that synergistically enhances electrolyte ion transport and electrode charge transfer. This approach achieves pre-reconstructed interfacial engineering through in situ phase reconstruction of the electrolyte during heat pretreatment, rather than through real-time interfacial evolution under operating conditions. By tuning the Ti:Ce ratio in the precursor composites, the Na 2 CO 3 -triggered reconstruction converted TiO 2 into oxygen vacancies Na 2 Ti 6 O 13 and formed Na 2 Ti 6 O 13 -CeO 2 (Nd) heterostructure electrolytes. Assembled with LiNi 0.8 Co 0.15 Al 0.05 O 2 electrodes, the optimized Ti:Ce-6%(PS) fuel cell achieves a superior power density of 1011 mW cm −2 at 550 °C. Its excellent structural stability enables stable cell operation for over 45 h at 100 mA cm −2 . This study provides a synergistic and scalable material design strategy for high-efficiency fuel cells.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Yuran Li,Yu Zhang,Yuting Lin,Guangyan Xu,Ruixiang Xu,Wei Su,Tingyu Zhu
A K-Nd/Al 2 O 3 catalyst achieves a COS capacity of 1.46 g/g under H 2 S/O 2 co-feeding. • K modulates Nd Lewis acidity and facilitates the dissociative activation of H 2 O. • Synergistic K and Nd sites enable the formation of key *HOCOS and *HSCOO intermediates. • Adaptive Nd-O x sites, enhanced by K-induced effects, promote H 2 S desorption. The development of efficient alumina-based catalysts for carbonyl sulfide (COS) hydrolysis remains a significant challenge, as their application in real blast furnace gas is largely hindered by insufficient activity and poor long-term durability. Here, K-Nd/Al 2 O 3 maintains nearly complete COS conversion for 20 h at 120 °C and achieves a cumulative COS conversion capacity of 1.46 g/g under a simplified H 2 S/O 2 -containing atmosphere. Comprehensive characterization reveals that K-Nd co-modulation tailors acid-base site distribution, preserving active sites. Aberration-corrected HAADF-STEM and XAFS analyses confirm that Nd is predominantly atomically dispersed, existing as isolated, low-coordinated Nd-O x single-sites. During reaction, the Nd-O coordination number increases from 4.2 to 8.0 without aggregation, demonstrating reaction-induced reconstruction of the first coordination shell. Surface characterization, in-situ DRIFTS, and DFT calculations further show that K enhances surface electron density and fine-tunes Nd Lewis acidity, promoting H 2 O dissociation and nucleophilic *OH attack on COS, stabilizing *HOCOS and *HSCOO intermediates while facilitating H 2 S desorption. The synergy between Nd-O x centers and K-induced electronic regulation reconcile durable COS hydrolysis under harsh conditions. Download: Download high-res image (225KB) Download: Download full-size image
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MATERIALS & DESIGN
·
2026
·
IF 8.2
Jiawei Li,Gaiyuan Chen,Min Chen,Zhengxin Wu,Yong Liu
Uranium tailings are directly upcycled into composite ceramics waste forms via microwave sintering. • A dual-phase SrZP/monazite structure enables simultaneous immobilization of Sr 2+ and Nd 3+ . • Rapid microwave sintering achieves high densification (4.24 g·cm −3 ) within 50 min at 1200 °C. • The composite ceramics exhibit enhanced mechanical strength up to 714.1 HV 1 . • Ultra-low leaching rates of Sr (10 –4 ) and Nd (10 –7 g·m −2 ·d –1 ) ensure long-term stability. As a primary byproduct of uranium mining and processing, Uranium tailings result in significant hazards for environment and human health owing to the presence of multivalent radioactive nuclides, especially for 226 Ra(II), 144 Nd(III), and 237 Np (III). Herein, we proposed a microwave one–step sintering of the uranium tailings to fabricate novel composite ceramics as (1– x )SrZP– x NdPO 4 ( x = 0, 0.2, 0.4, 0.6, 0.8, 1), suggesting the dual purposes of treating uranium tailings and immobilizing divalent fission products (FPs) and trivalent simulated nuclide. The phase evolution, microstructure, density, and chemical stability were systematically investigated for the sintered samples with different Sr/Nd ratios. As presented, the ceramics exhibit high densification without elemental enrichment via sintering at 1200 °C with a 50–min soak . As x increases in the crystalline phase, the content of monazite synchronously increases, leading to a maximum density of 4.24 g·cm −3 and a maximum Vickers hardness of 714.1 HV1 in final SrZP–NdPO 4 composite ceramics. More importantly, the SrZP–NdPO 4 composite ceramics demonstrate an excellent leaching resistance, correponding to the leaching rates of Sr and Nd as low as 10 –4 g·m −2 ·d –1 and 10 –7 g·m −2 ·d –1 over a 42–day period, respectively. This study offers a promising strategy for the long-term stabilization and safe disposal of the divalent FPs and trivalent radionuclides in uranium tailings via a ceramic solid-solution approach. A novel (1– x )SrZP– x NdPO 4 composite ceramic was designed to simultaneously enable uranium tailings utilization and the immobilization of divalent fission products (Sr) and trivalent surrogate nuclides (Nd). Download: Download high-res image (264KB) Download: Download full-size image
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 9
·6807-6813
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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
·
凝聚态物理
·
纳米材料
·
功能材料
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MATERIALS & DESIGN
·
2023
·
IF 8.4
Yanbang Lian,Congcong Wang,Yu Meng,Junqiang Dong,Jianbin Zhang,Gongxun Bai,Jianbo Gao
Rational design and preparation of multifunctional low dimensional nanomaterials are of great importance for in vivo imaging and safety therapy. Meanwhile, nanomaterials with good bio-compatible and effectively photothermal conversion are still demanded to be fabricated in biomedicine. In this work, we have developed two-dimensional bismuth selenide nanosheets as the imaging and photothermal nanoagents. Through doping engineering, the near infrared photothermal conversion of Nd doped nanosheets was boosted by 52 %, which is higher than many previous works. Besides, the prepared nanomaterials can realize infrared and in vivo computed X-ray tomography bioimaging, due to the rich optical-magnetic properties of Nd atoms. The in vitro and vivo experiments with mice display that the Nd doped nanosheets have low toxicity and high biocompatibility. More importantly, the nanomaterials can efficiently achieve photothermal tumor ablation. It is suggested that designed and developed nanosheets have promising applications for biomedicine.
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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.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chongguang Lyu,Chang Liu,Huihua Min,Xinyu Shi,Ran Jiang,Zhikang Ao,Xu Zhang,Chunli Wang,Huifang Ma,Lin Wang
Lead-free double perovskites have been an excellent candidate for resistive memories due to their mixed electronic-ionic properties, remarkable ambient stability and nontoxicity. However, the studies on resistive memories of rare-earth ion doping lead-free double perovskite are scarce to date. Here, we report the lead-free double perovskite Cs 2 AgBiBr 6 films with tuning rare earth Nd 3+ content by the vacuum sublimation and solution processing. The X-ray diffraction (XRD) pattern and scanning electron microscopy (SEM) confirm that Nd-doped Cs 2 AgBiBr 6 films show high crystallinity and phase purity. We also systematically investigate the resistive memory properties of the resulted Cs 2 AgBiBr 6 films doped by different content Nd 3+ . The resistive memory devices demonstrate a typical write-once-read-many-times (WORM) behavior with low on-set voltage and long retention time. Particularly, the ON/OFF ratio of Nd-doped Cs 2 AgBiBr 6 film is 1000 times higher than that of the undoped Cs 2 AgBiBr 6 film. This study exhibits that Nd-doped Cs 2 AgBiBr 6 film provide a new material platform for lead-free perovskite-based application in future electronics and optoelectronics .
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 11
·1-10
·
IF 2.132
Yang Yunjiang,Zhu Xiaowei,Bao Jinrong,Bai He,Wu Anping,Qiao Yan,Bian Yulong,Zhao Xin,Li Wenxian,Liu Ying
In this study, the core/shell/shell-structured SiO 2 /YPO 4 :Nd/SiO 2 composite microspheres with near-infrared luminescence property were prepared by sol-gel method. The morphology and structure of the as-prepared microspheres were observed by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and infrared spectroscopy (IR). These tests show that the composite microspheres have a sandwich structure. The diameter of the core SiO 2 microspheres is ~ 220 nm, the intermediate layer thickness of rare-earth phosphate is ~ 5 nm, and the outer SiO 2 layer is ~ 20 nm thick. The core/shell/shell microspheres are emitted at 1063 nm in the near-infrared region, which attributes to optical transparent windows of biological tissues. Meanwhile, the interaction between the composite microspheres and bovine serum albumin (BSA) was investigated. The results showed that the composite microspheres could quench the emission intensity of BSA by binding the tryptophan residues in BSA. The synthesized core/shell/shell composite microspheres may be used as near-infrared luminescence probes in the field of biological tissue imaging.
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Science Advances
·
2020
·Vol. 6
·期 32
·
IF 13.117
Lingling Ma,Yanling Zhou,Zhaowenbin Zhang,Yaqin Liu,Dong Zhai,Hui Zhuang,Qin Li,Jianding Yuye,Chengtie Wu,Jiang Chang
Photothermal therapy (PTT), an emerging tumor treatment technology, has attracted tremendous interest, but excessive heat will cause damage to surrounding healthy tissues. Therefore, in situ temperature monitoring during PTT is of great importance to determine optimal treatment temperature and repair heat-damaged normal tissues. Here, we report the preparation of multifunctional Nd-Ca-Si silicate glasses and glass/alginate composite hydrogels that not only have photothermal property but also emit fluorescence under 808-nm laser irradiation, and its fluorescence intensity is linearly correlated with in situ temperature. With this feature, optimal PTT temperature for effective tumor treatment with minimal normal tissue damage can be obtained. In addition, because of the bioactive silicate components, the composite hydrogel has bioactivity to repair heat damage caused by PTT. This implantable multifunctional material with unique temperature monitoring, photothermal function, and wound healing bioactivity can be used for localized thermal therapy.
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