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.
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高影响因子
RSC Advances
·
2013
·Vol. 3
·期 48
·26367-26375
·
IF 2.562
Lining Sun,Yannan Qiu,Tao Liu,Hongshang Peng,Wei Deng,Zhijuan Wang,Liyi Shi
The homogeneously transparent hybrid gels (Ln–N–P-gel, Ln = Sm, Yb, Nd, Er, Pr, Ho, Tm) containing lanthanide complexes (by using dinaphthoylmethane (dnm) as the primary ligand and 1,10-phenanthroline (phen) as the synergic ligand) via the in situ approach have been prepared. The dnm ligand was synthesized and adopted with the aim to sensitize the lanthanide ions with visible light. The properties of Ln–N–P-gels were investigated by Fourier-transform infrared (FT-IR), diffuse reflectance (DR), scanning electron micrographs (SEM), fluorescence spectra and thermogravimetric analyses. The results reveal that the lanthanide complexes are successfully in situ synthesized in the corresponding Ln–N–P-gels. Under the excitation of visible-light, the Ln–N–P-gels showed the respective visible (Sm3+) and near-infrared (Sm3+, Yb3+, Nd3+, Er3+, Pr3+, Ho3+, Tm3+) luminescence. The near-infrared (NIR) luminescence of Sm3+, Pr3+, Ho3+, and Tm3+ complexes sensitized by visible-light had been rarely reported previously, which is highly desired for biomedical and photonics applications. Based on the relevant energy levels, a model was proposed to explain the visible-NIR luminescence of the Ln–N–P-gels based on the visible-light excitation.
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高影响因子
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).
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PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 10
·102505
·
IF 4.316
Chenteng Sun,Qian Xu,Yongxiang Yang,Xingli Zou,Hongwei Cheng,Xionggang Lu
The electrochemical behaviors of Li+ and Nd3+ were investigated on W, liquid Sn pool and Sn film electrodes in LiCl-KCl-NdCl3 melt at 673 K. Various electrochemical techniques, such as cyclic voltammogram, square wave voltammogram, and open circuit chronopotentiometry, were conducted to evaluate the electrochemical behaviors of Li+ and Nd3+. The reduction of Nd3+ was found to be a two-step process in the W electrode and a one-step process in the liquid Sn electrode. During the formation of the Nd-Sn intermetallic compounds, only the NdSn3 would be formed without the reduction of the Li+ in the liquid Sn electrode. When the reduction potential moves over −2.77 V vs Cl2/Cl−, the Li+ in the electrolyte would inevitable be reduced into the liquid Sn electrode. The Nd-Sn intermetallic compounds were deposited on the liquid Sn pool electrode at −2.74 V vs Cl2/Cl− in the LiCl-KCl-NdCl3 melts for 5 h. The products were characterized by SEM-EDS and XRD. The loose product on the surface of the deposition displayed the existence of NdSn3 in Nd-Sn intermetallic compounds. The high content of Nd inclusion formed by segregation was detected in the solidified Sn electrode.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jie Cheng,Shuo Huang,Yang Li,Tongqing Wang,Lile Xie,Xinchun Lu
Ce 3+ in CeO 2 , rather than Ce 4+ , is believed to provide assistance to the breaking up of Si O bond during chemical mechanical polishing (CMP) of silica. In the paper, lanthanide metals (La, Nd and Yb) doped CeO 2 nanoparticles were synthesized by modified incipient impregnation method in order to improve the content of Ce 3+ in CeO 2 as polishing. X-ray photoelectron spectroscopy (XPS) experiments and density function theory (DFT) calculation demonstrate this approach could achieve surface doping of CeO 2 nanoparticles, and facilitates the formation of oxygen vacancy and Ce 3+ content. CMP experiments show that the polishing rate and the surface quality of silica wafer are obviously improved by using the doped CeO 2 as abrasive particles. Especially for Nd/CeO 2 , content of Ce 3+ increases from 0.146 to 0.235, the polishing rate of silica is accelerated by 29.6% in alkaline slurries, and a better surface quality (Sa = 9.6 Å) is obtained.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Jinlong Li,Boxin Li,Guozhe Sui,Lijuan Du,Yan Zhuang,Yulin Zhang,Yuanfang Zou
Volatile organic compounds (VOCs) with toxicity properties discharged from industrial emissions and combustion engines threaten human health and cause environmental problems. Therefore, it is important to develop technologies to remove VOCs from air. In this study, the performance of Nd (neodymium) -TiO 2 nanoparticles embedded in a supported ionic liquid membrane (SILM) for removal of VOCs from air was investigated. Aiming at functionalizing the ionic liquid membrane with photocatalytic capability, we developed a facile and effective approach for the removal of VOCs by coupling highly efficient photocatalysts with the SILM. Nd-TiO 2 nanoparticles , which are ultraviolet-visible (UV–Vis) light-driven photocatalysts, were prepared by sol-gel and immersed in the SILM for use as a photocatalytic membrane-based reactor. The gaseous VOCs tested were toluene, acetone, chloroform, benzene, and xylene. We confirmed that at a loading of 50 wt% Nd-TiO 2 nanoparticles (1 wt% Nd content) and 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMI m ]PF 6 ) as SILM ([HMI m ]PF 6 /Nd-TiO 2 SILM), the as-prepared photocatalytic membrane-based reactor exhibited higher removal efficiency of VOCs from air (60~80% removal after 10 h) under UV–Vis light illumination than individual SILM or photocatalytic systems. Effluent gas analysis revealed that 25–55% of VOCs was decomposed and mineralized in the photocatalytic membrane reactor, which exhibited higher VOCs removal efficiency than membrane separation. These results indicate that the photocatalytic membrane-based reactor containing Nd-TiO 2 nanoparticles and SILM designed in this study is highly active and stable. This study on [HMIm]PF 6 /Nd-TiO 2 SILM was initiated to couple membrane separation with photocatalytic degradation of gaseous VOCs and can serve as a promising way for eliminating harmful VOCs with low concentration from air.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Shuai Hu,Xiaoxuan Zhu,Yan Zhu,Chenliang Zhou,Gewen Yu,Yanming Wang,Cong Wang,Zhenfeng Wang,Jian Ding,Yuqing Wang,Xiaohui Guo
To enhance the activity and selectivity of Cu-based catalysts in the CO 2 hydrogenation reaction, this study systematically investigated the regulation effect of Nd-doping on the structure and surface properties of different oxide support (MgO, Al 2 O 3 , ZrO 2 , and CeO 2 ), and further explored its influence on the state of Cu species as well as the catalytic performance in CO 2 hydrogenation to methanol. The results show that the introduction of Nd 3 + can effectively induce lattice distortion of the support which promotes the generation of oxygen vacancies and the formation of surface basic sites, thereby enhancing the interfacial electronic interaction between Cu and support and improving the stability of Cu + active centers. Among them, the Cu catalyst supported on Nd-doped ZrO 2 exhibited the best catalytic performance such as the high CO 2 conversion and selectivity to methanol. Various characterization (XRD, SEM, in-situ XPS, H 2 -TPR, CO 2 -TPD, and H 2 -TPD) results confirmed the key role of Nd-doping in regulating the oxygen defects, electronic structure, and Cu species distribution over support. This study reveals the structural regulation mechanism of Nd in constructing efficient Cu-based catalysts for CO 2 hydrogenation from the perspective of support engineering, providing theoretical basis and practical guidance for the design of new high-performance catalytic materials.
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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.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yaozu Guo,Junhua You,Wenli Pei,Yingdong Qu,Dong Zhao,Zhengwen Yang
This paper reports a novel chemical method to synthesize Nd-Fe-B magnetic nanoparticles . The fabrication mechanism of the particles have been studied through understanding formation of the corresponding intermediate phases as well as their microstructures after annealing and reduction-diffusion processes as function of the (C 2 H 5 ) 3 NBH 3 content. Nd-Fe-B intermediate phases were composed of small Fe 3 O 4 particles and Nd and Fe microcrystals encapsulated with nitriles . Fe 3 O 4 was reduced by BH 3 − into α-Fe as the (C 2 H 5 ) 3 NBH 3 content increased. After annealing, Nd-Fe-B oxide particles gradually agglomerated as the (C 2 H 5 ) 3 NBH 3 content increased, which affected the particle sizes after the reduction-diffusion step. Mixture of Nd 2 Fe 14 B and H 5 Nd 2 was obtained from precursors synthesized with 1.5 and 2.5 mmol of (C 2 H 5 ) 3 NBH 3 . Magnetic properties of these mixtures demonstrated soft magnetic phase characteristics. Relatively pure Nd 2 Fe 14 B nanoparticles with a coercivity of 5.09 kOe and magnetic energy product (BH max ) of 2.862 MGOe were obtained when (C 2 H 5 ) 3 NBH 3 initial content was 3.5 mmol. Exchange coupling nanoparticles of Nd 2 Fe 14 B, Fe 3 B and Fe 2 B were obtained with the coercivity of 3.787 kOe and (BH) max equal to 4.871 MGOe at (C 2 H 5 ) 3 NBH 3 content of 4.5 mmol.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.9
Han Yu,Ying Wang,Zhen Shi,Chenxi Fang,Hang Zeng,Junting Sun,Vilko Mandić,Xuefeng Zhang
Although superhydrophobic coatings have been widely employed for corrosion protection due to their low surface energy, their low surface energy characteristic also results in weak interfacial adhesion and the influence of interfacial adhesion on the overall anti-corrosion performance remains poorly understood. Herein, we explored the corrosion resistance of superhydrophobic coatings on sintered Nd-Fe-B magnets from the perspective of work of adhesion (Wₐ), which represented the interfacial stability and bonding strength. By precisely controlling the PDA shell thickness and the degree of hydrophobization, the work of adhesion can be regulated correspondingly. The results revealed that the overall anti-corrosion performance of superhydrophobic coatings was directly proportional to the work of adhesion. At an optimized Wₐ of 49.44 mN·m -1 , the coated magnet exhibited a low corrosion current density of 1.09 × 10 −8 A/cm 2 , which was three orders of magnitude lower than that of 3.27 × 10 −5 A/cm 2 for bare Nd-Fe-B magnet. Moreover, outstanding protection durability was also demonstrated in both acidic and alkaline environments with robust interfacial contact. In contrast, weak adhesion induced the formation of interfacial gaps, which served as preferred penetration pathways for the corrosive medium. This study evidenced the importance of interfacial structural integrity, revealing the critical role of adhesion layer design in enabling robust and durable anti-corrosion performance of superhydrophobic coatings.
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高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Kaung Khant Kyaw,Tao Jiang,Heng Cao,Zhaoyang Leng,Hajra Baig,Waris Ghani,Youqi Zhu,Chuanbao Cao,Meishuai Zou
Lattice contraction increases defect oxygen species and modifies surface transition-metal redox states. • HEP-Nd-0.3 achieves a bifunctional potential gap ΔE = 0.77 V with OER overpotential of 290 mV and ORR half-wave potential of 0.75 V. • Zn-air battery delivers 115 mW cm⁻² peak power density and stable operation for over 340 h. • A-site lattice modulation alone enhances intrinsic OER/ORR activity without aliovalent doping. Rechargeable zinc–air batteries require bifunctional air-cathode catalysts capable of efficiently catalyzing both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, La 1-x Nd x (Cr 0.2 Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 ) O 3 (x = 0, 0.1, 0.2, and 0.3) high-entropy perovskites (HEP) were synthesized to examine the influence of isovalent Nd³⁺ substitution at the A site on bifunctional oxygen electrocatalysis. Replacement of La³⁺ with smaller Nd³⁺ preserves the nominal A-site charge while inducing lattice contraction and modifying the surface chemical environment of the multication perovskite. Among the investigated compositions, HEP-Nd-0.3 exhibits the best bifunctional activity, delivering an OER overpotential of 290 mV at 10 mA cm −2 , an ORR half-wave potential of 0.75 V versus RHE, and a bifunctional potential gap of 0.77 V. When used as the air-cathode catalyst in a rechargeable zinc–air battery, HEP-Nd-0.3 achieves a peak power density of 115 mW cm −2 and stable charge–discharge operation for >340 h. The enhanced performance is associated with Nd-content-dependent variations in lattice structure, surface oxygen chemistry, electrochemically accessible surface area, and charge-transfer characteristics. These results identify isovalent rare-earth A-site substitution as a practical strategy for tuning high-entropy perovskite oxygen electrocatalysts. Download: Download high-res image (313KB) Download: Download full-size image
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高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Wenjie Zhang,Yunpeng Du,Xiong Tong,Xian Xie,Dongxia Feng,Qiang Song
As the most important method for the separation and purification of rare earth elements, solvent extraction is widely used in industry. HDEHP (Di(2-ethylhexyl) phosphoric acid) has become the most commonly used organic extractant because of its high separation factor for rare earth elements and large processing capacity. However, the large amount of ammonia nitrogen wastewater generated during the extraction process creates huge pressure on the environment. The tartaric acid complexing agent has been added to the aqueous phase to improve the extraction performance of HDEHP without saponification. This can effectively avoid the generation of ammonia nitrogen wastewater, which is more in line with the concept of green production. In this study, the effect of tartaric acid on the separation of Pr and Nd by HDEHP in hydrochloric acid and the corresponding mechanism are investigated. This study showed that the addition of tartaric acid could significantly increase the separation coefficient of HDEHP for Pr and Nd. When the tartaric acid concentration was 0.4 mol/L and the solution pH was 2.5, the separation coefficient reached β Nd/Pr = 1.85, which was higher than the separation coefficient of HDEHP for Pr and Nd in the saponification system. Combining Fourier-transform infrared spectroscopy, nuclear magnetic spectroscopy other analysis and detection methods, and in-depth exploration of the extraction mechanism, the final extraction of the compound structures was determined.
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高影响因子
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