RSC Advances
·
2021
·Vol. 11
·期 45
·27969-27977
·
IF 3.361
Yaoyang Liu,Sheng Liu,Zhibin Liu,Chuang Zhao,Chunhui Li,Yu Zhou,Caishan Jiao,Yang Gao,Hui He,Shaowen Zhang
A novel asymmetric diglycolamide N,N-dimethyl-N′,N′-dioctyl diglycolamide (LII) was synthesized. The Nd(III) extraction behavior from HNO3 and loading capability of the solution of LII in 40/60 (v/v)% n-octanol/kerosene were studied. Analyses by the slope method, ESI-MS, and FT-IR indicated that, similar to the previously studied isomer ligand N,N′-dimethyl-N,N′-dioctyl diglycolamide (LI), 1 : 3 Nd(III)/LII complexes formed. Under the same experimental conditions, the distribution ratio and limiting organic concentration of LII towards Nd(III) were smaller than those of LI, but the critical aqueous concentration of LII was larger, which implies that LII exhibited poorer extraction and loading capabilities towards Nd(III) than LI, and LII has a tendency to be less likely to form the third phase. The quasi-relativistic density functional theory (DFT) calculation was performed to provide some explanations for the differences in their extraction behaviors. The electrostatic potential of the ligands indicated that the electron-donating ability of the amide O atoms in LII displayed certain differences compared with LI. This inhomogeneity in LII affected the interaction between LII and Nd(III), as supported by QTAIM and bonding nature analysis, and it seemed to reflect in the extraction performance towards Nd(III).
研究领域:
化学
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材料科学
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DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Shuaida Zhu,Xiong Cao,Xiaoqing Cao,Yuqi Feng,Xinbing Lin,Kehua Han,Xiaoxia Li,Peng Deng
In this paper, we studied the effect of M-doped graphitic carbon nitride (M-g-C 3 N 4 , M = Fe, Nd, Ce, Zr, U) as a catalyst for the thermal decomposition of ammonium perchlorate-based molecular perovskite DAP-4. DAP-4 was synthesized by a molecular assembly strategy. G-C 3 N 4 and M-g-C 3 N 4 composite samples were prepared by pyrolytic and co-sintering methods. X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy-energy dispersion X-ray spectrometry, and X-ray photoelectron spectroscopy were used to characterize the morphology, structure, element distribution, and element chemical states of the catalysts. Differential scanning calorimetry was used to elevate the thermal catalytic decomposition effect of g-C 3 N 4 and M-g-C 3 N 4 on DAP-4. The results showed that g-C 3 N 4 and M-g-C 3 N 4 have catalytic activity for the thermal decomposition of DAP-4. Among the tested catalysts, Fe-g-C 3 N 4 had the best catalytic activity for the thermal decomposition of DAP-4, as well as advantages over pure g-C 3 N 4 and other M-g-C 3 N 4 catalysts. Especially, Fe-g-C 3 N 4 reduced the peak temperature of DAP-4 by 75.3 °C, increased heat release by 464 J g −1 , and decreased activation energy by 55.5 kJ mol −1 . Moreover, a possible catalytic mechanism is proposed. This work may offer a new way to promote the application of DAP-4 in the field of solid rocket propellants.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Changchao Su,Yuheng Sun,Hongqun Tang,Youbin Wang,Fuxu Tao,Zhengbin Xu,Chunhua Wei,Zezuo Jiang,Shiqiang Wei
Rare-earth metal neodymium is an important raw material for NdFeB permanent magnets, and its demand has significantly increased in recent years. Molten salt electrolysis is the main method for the production of metal neodymium, so the study of the electrodeposition process of neodymium ions in molten salt at the cathode is of great significance for the production of metal neodymium. In this paper, the electrochemical deposition process of neodymium ions on a tungsten working electrode was studied in a LiF-NdF 3 -Nd 2 O 3 molten salt system using electrochemical methods such as cyclic voltammetry and open circuit potential. Additionally, the influence of LiF content in the molten salt on the electrodeposition process was analyzed. The experimental results indicate that the reduction of neodymium ions in the LiF-NdF 3 -Nd 2 O 3 molten salt system consists of two stepwise quasi-reversible redox reactions: Nd(III) → Nd(II) and Nd(II) → Nd(0). The corresponding reduction peak potentials are −0.78 V and −1.19 V, respectively. The Nd(III) → Nd(II) reaction is solely diffusion-controlled, while the Nd(II) → Nd(0) reaction is governed by both surface control and diffusion control in the electrochemical process. The increase in LiF content in the molten salt leads to a shift of the cathodic overpotential in the positive direction. When the LiF content is high, the reduction of neodymium ions on the electrode becomes unstable, making it unfavorable for the deposition of metal neodymium on the tungsten electrode.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 10
·106108
·
IF 1.449
Wenli Pei,Xiaohan Zhang,Qinyu Meng,Jifeng Zhou,Yaozu Guo,Junhua You,Dong Zhao,Xiaoyang Wang
Nd-Fe-B nanoparticles have been successfully prepared by using an optimized low-energy chemical method. The effects of reduction-diffusion time on the microstructure and properties of Nd-Fe-B nanoparticles were investigated by using TEM, XRD, SEM, VSM and Rietveld calculations. The results showed that when the reduction-diffusion time was short, the reaction was not sufficient, which resulted in a residual H5Nd2 phase. When the reduction-diffusion time was prolonged, the H5Nd2 phase gradually decreased and the relative crystallinity of Nd2Fe14B phase gradually increased. Moreover, the grain size grew and the rich Nd phase appeared gradually around the grains. Furthermore, as the reduction-diffusion time was prolonged, the coercive force of Nd-Fe-B nanoparticles increased first and then decreased. When the holding time was extended to 180 min, the coercive force reached a maximum of about 4.85 kOe and the magnetic energy product was about 2.5 MGOe.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Mengqiu Tang,Jixu Cheng,Xiaoyu Liang,Yuqing Luo,Qilin Wu
Flexible wearable pressure sensors exhibit great potential in human activity tracking. Designing visual sensors that integrate active luminescence and motion monitoring is a current research focus. This study proposed a novel five-layer mechanoluminescent piezoelectric sensor (MPS) that synergistically combined the piezoelectricity of Nd-ZnO NRs loaded carbonized silk fabric (CSF) with the luminescent capability of ZnS:Cu/PDMS. A low-temperature hydrothermal method was utilized to incorporate Nd 3 + into the ZnO lattice, while loading the ZnO NRs onto CSF. Nd 3+ was used as a p-type dopant to regulate the piezoelectricity of ZnO, yielding a highly sensitive piezoelectric layer. The resulting MPS exhibited high pressure sensitivity ( S = 27.48 mV/kPa, 0–100 kPa), excellent pressure response (Response time = 150 ms), and outstanding stability (>2400 cycles). Experiments demonstrated that MPS can effectively monitor human joint movement. Due to the introduction of ZnS:Cu, MPS emitted pulsed light which intensity was linearly correlated with the applied stress (R 2 = 0.98). During the nighttime running test, MPS emitted electrical and optical signals corresponding to the bending angles and frequencies of human joints. MPS features visual and electrical dual-mode sensing capabilities, enabling simultaneous monitoring of pressure and strain stimuli to achieve stress visualization. This study provides a feasible approach to developing intelligent sensing systems with active luminescence.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Mengfan Xu,Huangzhong Liang,Hao Zhou,Yongchun Bao,Jingzhi He,Linxia Bu,Rui Wang,Limei Duan,Quan Zhuang,Jinghai Liu,Yin Wang
This work regulates electronic structure and oxygen vacancies of Fe 2 O 3 via Nd-O-Fe 4f-2p-3d orbital coupling, promoting OER mechanism from AEM to LOM and clarifying the intrinsic catalytic origin. • The as-prepared Nd-Fe 2 O 3 @C shows low overpotential and favorable OER activity, with stable operation over 300 h at 10 mA cm -2 , presenting remarkably improved stability. • In-situ IR, in-situ Raman combined with DFT calculations demonstrate that Nd doping upshifts the Fe d-band center and reduces the Fe spin state, significantly lowing the adsorption energy of Fe 2 O 3 toward *OH and *O species. The development of highly active and stable non-precious metal-based catalysts for the oxygen evolution reaction (OER) is crucial for achieving efficient and low-cost hydrogen production through electrolysis. Herein, the temperature-programmed calcination approach is employed to synthesize the target catalyst of Nd-doped Fe 2 O 3 on graphitic carbon (Nd-Fe 2 O 3 @C). This Nd-Fe 2 O 3 @C presents excellent OER performance with a low overpotential of 359 mV at 10 mA cm −2 , a small Tafel slope of 70.31 mV/dec, and long-term stability (over 300 h). Tetramethylammonium hydroxide (TMAOH) measurements coupled with in-situ characterizations capture the dynamic evolution of key oxygen intermediates, verifying that Nd doping creates oxygen vacancies and thereby triggers the lattice oxygen oxidation mechanism (LOM). Density functional theory (DFT) calculations revealed that Nd doping increases antibonding orbital occupancy, which leading to weaker adsorption of oxygen intermediates and facilitate *OH and *O desorption during the OER. This work establishes oxygen vacancy engineering as effective strategy for robust water oxidation through LOM pathway. The Nd-Fe 2 O 3 @C with 4f–2p–3d gradient orbital coupling catalyst exhibits a low overpotential (η 10 = 359 mV), a small Tafel slope (70.31 mV dec -1 ) and outstanding long-term catalytic stability (300 h). DFT calculations demonstrate that Nd doping upshifts the Fe d-band center and reduces the Fe spin state, significantly lowing the adsorption energy of Fe 2 O 3 toward *OH and *O species. Download: Download high-res image (293KB) Download: Download full-size image
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wenbin Zhang,Gongxun Bai,Jiawen Wang,Ruyue Zhang,Wensong Jiang,Yang Zhang,Shiqing Xu,Liang Chen
Rare earth-doped nanomaterials can achieve diverse upconversion luminescence by changing doping ions, presenting them as promising candidates for rapid temperature measurement. However, most upconversion luminescent phosphors have a thermal quenching effect, which greatly weakens the luminous intensity of the material and impairs thermometry performances. Here, we studied the synthesis of Bi 4 Ti 3 O 12 nanosheets tridoped with Er 3+ , Yb 3+ , and Nd 3+ ions using molten salt method. Notably, this luminescent material demonstrates both thermal quenching and thermal enhancement effects. The unusual phenomenon results in a high sensitivity of the optical temperature sensor based on the inter-ion energy level between Er 3+ and Nd 3+ . At 523 K, this sensitivity reaches 5.94×10 −2 K −1 , surpassing that of sensors relying on the thermal coupling of only Er 3+ ions by nearly ninefold. Our findings suggest a promising strategy to augment the temperature sensing sensitivity of luminescent materials, paving the way for potential applications in precise temperature monitoring.
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jin Zhou,Andi Liu,Fangyuan Song,Langsheng Ling,Jingxin Li,Wei Tong,Zhengcai Xia,Gaoshang Gong,Yongqiang Wang,Jinkui Zhao,Hanjie Guo,Zhaoming Tian
Compared with the intensive investigation on 3d transition metal (TM)-based spin ladder compounds, less attention has been paid to the ones constructed by rare earth (RE) ions. Herein, we report a family of RE-based spin ladder compounds Ba2RE2Ge4O13 (RE = Pr, Nd, Gd–Ho) crystallized into a monoclinic structure with the space group C2/c. The RE ions are arranged on a two-leg spin ladder motif along the b-axis, where the rung and leg exchange interactions are bridged via RE–O–RE pathways and RE–O–Ge–O–RE routes, respectively. Moreover, the much shorter rung distance in RE2O12 dimer units than the leg distance suggests that Ba2RE2Ge4O13 compounds are strong-rung spin ladder systems. All of the synthesized Ba2RE2Ge4O13 (RE = Pr, Nd, Gd–Ho) compounds exhibit dominant antiferromagnetic (AFM) interactions and the absence of magnetic order down to 1.8 K. Among the family members, Ba2Dy2Ge4O13 can be described by Jeff = 1/2 Kramers doublet states, and the low-temperature specific heat indicates the coexistence of the spin-dimerized state with a broad maximum at ∼2.4 K and long-range AFM order with TN = 0.81 K. This family of Ba2RE2Ge4O13 compounds thereby provides a rare platform to investigate the novel spin ladder physics constructed by 4f electrons.
研究领域:
凝聚态物理
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磁学
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无机化学
·
量子材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Xin Wang,Yujie Ren,Wenge Fan,Qingqing Zhu,Peilin Yuan,Peng Jin,Xiaodong Wei,Chufeng Sun
Yttria-stabilized zirconia (YSZ) ceramic-based flow passage components are highly susceptible to cavitation erosion. To counter this limitation, rare-earth oxide (REO, RE=La, Ce, Nd, Gd) doped YSZ with superior cavitation erosion resistance was successfully prepared using spark plasma sintering technology. The microstructures, phase compositions, mechanical properties, and cavitation erosion resistance of YSZ and REYSZ were investigated. The results indicate that REO doping promoted the generation of t'- and c-phases, leading to a denser structure and grain refinement. Moreover, the presence of a larger concentration of the t'-phase resulted in a higher microhardness and elastic modulus. Owing to its superior mechanical properties, fine grains and high density, REYSZ exhibited improved cavitation erosion resistance. Particularly, NdYSZ exhibited 12.4 times higher cavitation-erosion resistance than that of YSZ. Furthermore, the grain boundaries of YSZ contain special m-phase bands, which are also responsible for the quicker exfoliation of grains during cavitation erosion. The segregation of rare earth elements at the grain boundaries inhibited the generation of m-phase bands, resulting in a longer cavitation erosion incubation period for REYSZ.
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高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Xianghua He,Ben Dai,Yafang Zhang,Dan Zhao,Dihui Zhang,Ruping Liang,Chao Chen
Efficient and applicable catalysts are highly desirable for advanced biomass transformation industry, here, we fabricated a series of Nd-Co-P catalysts for hydrogenation of furfural (FAL) to furfuryl alcohol (FOH). By comprehensive characterizations, it is demonstrated that the prepared Nd-Co-P samples are structured as (NdPO 4 ) m /Co 2 P nanocomposites with molar ratio ( m ) in range of 0.24–1.1; by manipulating m , the outstanding catalytic efficiency comparable with the performance of precious metal catalysts , such as turnover frequency (TOF) up to 0.50 s −1 (being ten-fold higher than Co 2 P) and FOH yield up to 97%, is achieved on the reusable (NdPO 4 ) m /Co 2 P composites. Temperature programmed desorption (TPD), in-situ infrared spectroscopy (IR) and kinetic-mechanism studies further disclose that Co 2 P is decisive for activating FAL, instead, NdPO 4 possesses unique capability of activating hydrogen which readily facilitate the selective hydrogenation of FAL to FOH through a rapid Langmuir–Hinshelwood process over (NdPO 4 ) m /Co 2 P catalyst. These results indicate that rare-earth phosphates like NdPO 4 can act as the promising and reliable catalytic component to activate hydrogen, which can be of interest not only for innovating novel and applicable non-metallic catalysts for sustainable biomass transformation analogous to hydrogenation of FAL, but also for expanding material base for other green mass transformation techniques involving hydrogen.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2022
·Vol. 134
·期 3
·1-11
·
IF 2.15
LIU XIAOJUAN,LI MINGMING,YANG SHUMING,YANG YAYA,NIE JIANG,XUE YUBING,OUYANG YINGGEN,XIAO SONGTAO
The increasing demand for neodymium (III) and samarium (III) due to their extensive high-tech applications has drawn much attention to their recovery. In this work, the copper-based metal-organic framework HKUST-1 was prepared and used for the adsorption of neodymium (III) and samarium (III) in the media of an aqueous solution. The maximum adsorption capacity of the material for neodymium (III) and samarium (III) was 284.11 and 503.45 mg g −1 at a pH of 5.5, respectively. The adsorption removal rate could achieve nearly 100% at the solid-to-liquid ratio of 1.0 g L −1 , which is relatively excellent among such adsorbents used for rare earth elements uptake. The mechanism and reversibility of neodymium (III) and samarium (III) adsorption were systematically investigated by X-ray diffraction, Fourier transforms infrared spectroscopy, Raman spectra, and X-ray photoelectron spectroscopy, suggesting that the mechanism for the adsorption was ion exchange and complexation between trivalent rare-earth ions and the oxygen atom in the hydroxyl group. The reason behind the material displaying a more robust affinity for samarium (III) may be caused by the energy difference between f n and f n+1 states of samarium (III) was larger than that of neodymium (III), thus forming stronger covalent bonding. Graphical abstract HKUST-1 exhibited high adsorption capacity towards Nd (III) and Sm (III). The reason behind the material displaying a more robust affinity for Sm(III) was caused by that the energy difference between f n and f n+1 states of Sm(III) was larger than that of Nd(III), thus forming stronger covalent bonding.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Lu Xing,Xifei Ma,Kaibo Hu,Hanmeng Yuan,Jia Wei,Hongshuai Gao,Yi Nie
Since neodymium (Nd) has similar physicochemical properties to lanthanum (La), cerium (Ce) and praseodymium (Pr), their efficient separation and purification is very difficult. Three new phosphate-based ionic liquids (ILs): N,N-dimethyloctylamine bis(2-ethylhexyl)phosphate ([N 1,1,8,H ][DEHP]), N,N-dimethyldecylamine bis(2-ethylhexyl)phosphate ([N 1,1,10,H ][DEHP]), N,N-dimethyldodecylamine bis(2-ethylhexyl)phosphate ([N 1,1,12,H ][DEHP]) were synthesized and evaluated for selective separation of Nd(III) from aqueous solution. The influences concentration of Nd(III), phase volume ratio (O/A), cation chain length of ILs, extraction time, extraction temperature, salt concentration, solution acidity have on the performance of ILs for extraction separation of Nd(III) from aqueous solution were systematically investigated. It was found that the extraction efficiency ( E ) of Nd(III) using [N 1,1,8,H ][DEHP] was close to 100% at pH of 4, and that it only required 10 min to reach extraction equilibrium at 303 K. Meanwhile, the separation factors ( β ) values of β Nd/La , β Nd/Ce , β Nd/pr using [N 1,1,8,H ][DEHP] were all higher than 3. The density functional theory (DFT) results indicated that the interaction between [N 1,1,8,H ][DEHP] and Nd were stronger than that between La , Ce and Pr . In addition, almost 100% of Nd(III) could be recycled from the loaded [N 1,1,8,H ][DEHP] phase using 0.16 mol·L −1 hydrochloric acid via one step, and the E of Nd(III) by regenerated [N 1,1,8,H ][DEHP] remained about 97% after eight cycles. Moreover, the extraction mechanism of Nd(III) using [N 1,1,8,H ][DEHP] was complexation mechanism based on infrared spectroscopy and slope analysis. This work furnishes a strategy for selective separation of Nd(III) using phosphate-based ILs without diluent.
研究领域:
化学
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材料科学
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环境科学
·
理论化学
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高影响因子
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