JOURNAL OF CHEMICAL THERMODYNAMICS
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2014
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IF 2.423
Da-Shun Zhang,Zhi-Cheng Tan,Bei-Ping Liu,Xiao-Bing Huang
Neodymium complex with glycine, Nd(Gly) 2 Cl 3 ·3H 2 O, was synthesized and characterized by IR spectra. The thermal stability of the complex was tested through TG and DTG and a possible mechanism of thermal decomposition was proposed. The heat capacities of the complex were measured by using an automated adiabatic calorimeter over the temperature range from T = (80 to 380) K, the thermodynamic functions, [ H T − H 298.15 ] and [ S T − S 298.15 ], were calculated based on the heat capacity measurements. Two (solid + solid) phase transitions in the ranges of T = (170 to 247) K were observed with the peak temperatures of 184.896 K and 231.217, respectively. The standard molar enthalpy of formation of [Nd(Gly) 2 Cl 3 ·3H 2 O] was determined to be (−3081.3 ± 1.1) kJ · mol −1 in terms of an isoperibol solution-reaction calorimeter.
研究领域:
物理化学
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无机化学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
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IF 3.012
Xueliang Li,Luyao Zhang,Zhongqiang Ding,Yang He
The carbon aerogel (CA) uniformly doped neodymium oxide (Nd 2 O 3 ) nanoparticle was synthesized by an effective in-situ method via acid catalyzing and used as the cathode matrix for lithium-sulfur batteries . The doped materials with interconnected pore structure of CA and evenly dispersed Nd 2 O 3 offer crucial confinement role to anchor sulfur and suppress the loss of polysulfide ions for interrelate function of S/polysulfides by Nd 2 O 3 . The composited sulfur electrodes present high electrochemical performances and initial discharge capacities, especially, the Nd2-CA/S sample gains initial discharge capacity of 1327 mAh g − 1 at 0.2 C and remains at 1082 mAh g − 1 after 100 cycles. Meanwhile, it still remains capacity of about 907 mAh g − 1 at 0.5 C after 300 cycles. The enhanced electrochemical performances can be ascribed to the crosslink mesoporous CA materials and well distributed neodymium oxide. Furthermore, the metal additive also takes promoting effect on redox reactions of the Li/S batteries presenting higher discharge voltages.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
Nanoscale
·
2014
·Vol. 6
·期 11
·5634-5638
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IF 6.739
Weikuan Duan,Yanyan Zhang,Zhongyue Wang,Jingyi Jiang,Chen Liang,Wei Wei
K5NdLi2F10 nanocrystals were synthesized by a novel synthetic route in the liquid phase, which could improve the morphology and reduce the size effectively, for the first time. The luminescence intensities of the K5NdLi2F10 nanocrystals and their dispersion in polyethylene glycol 400 (PEG-400) approximate to that of neodymium doped phosphate glass (3 mol%), while the lifetimes of the nanocrystals alone and when dispersed with Nd3+ ions (1 × 1020 cm−3) are 303.4 μs and 174.6 μs respectively. Based on the Judd–Ofelt analysis, the emission quantum yield of the dispersion reaches 39.57%. In all, the K5NdLi2F10 nanocrystals and their dispersion have promising applications as liquid laser materials and biological fluorescent markers.
研究领域:
材料科学
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光学
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生物标记物
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DOI
PubMed
高影响因子
JOM
·
2021
·Vol. 73
·期 12
·4376-4386
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IF 2.474
Zou Qi,Le Qichi,Chen Xingrui,Ban Chunyan,Jia Yonghui,Guo Ruizhen,Wang An
This work investigated the corrosion resistance of AZ80 (Mg-8Al-0.5Zn alloy) with different Nd contents in alkaline solution by the mass loss test, electrochemical test, scanning electron microscope, energy spectrum analysis, and x-ray diffraction. To remove the influence of the Mg 17 Al 12 phase, alloys were heat treated at 410°C for 10 h. Results revealed that Al 2 Nd and AlMnNd phases mainly exist in the alloy. The corrosion rate of the alloy increased when the Nd content was < 0.4 wt.% because the Al 2 Nd phase formed galvanic corrosion with the Mg matrix. With the increase of Nd content, AlMnNd phase appeared in the alloys, which decomposed during the corrosion process and formed a good protective film to reduce the corrosion rate.
研究领域:
材料科学
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腐蚀工程
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DOI
高影响因子
Journal of Materials Chemistry A
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2023
·Vol. 12
·期 3
·1753-1763
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IF 11.9
Yan Zhao,Yan Zhang,Qianqian Xu,Hanyu Gong,Mingyang Yan,Kaiyu Feng,Xiang Zhou,Xuefan Zhou,Dou Zhang
Hydrothermally synthesized Nd-doped bismuth titanate (Bi3.15Nd0.85Ti3O12, BIT-Nd) hierarchical microspheres with assembled nanosheets were developed for water splitting and wastewater purification utilizing the piezo-phototronic effect for the first time. Undoped Bi4Ti3O12 (BIT) microspheres were simultaneously studied for comparison to reveal the role of Nd doping. Under the combined light and ultrasound excitation, the degradation efficiency of RhB (C0 = 10 mg L−1) solution reached 97.5% in 8 minutes in the presence of the BIT-Nd microspheres, leading to an ultrahigh first-order rate constant k of 0.407 min−1, which was 4.9 times higher than that of the BIT microspheres. More impressively, superior piezo-photocatalytic activity in water splitting compared to that of other reported piezo-photocatalysts was achieved in the BIT-Nd microspheres, which showed a H2 evolution rate of 1330.3 μmol g−1 h−1 without any cocatalyst or scavenger. To understand the origins of the excellent piezo-photocatalytic performance, microstructure analysis and piezoelectric and photoelectric characterization, as well as density functional theory calculations were carried out. After Nd doping, the atomic framework of the Ti–O octahedron underwent an apparent distortion, resulting in a stronger ferroelectric polarization, and thus a larger piezoelectric potential output under pressure. Moreover, the thinner nanosheets in the BIT-Nd microspheres were more susceptible to deformation under the ultrasonic effect, which was also beneficial to generate a higher piezoelectric field that inhibited the charge carrier recombination. Additionally, the presence of Nd 4f orbitals in BIT-Nd effectively reduced the band gap and promoted the spectral absorption and production of photogenerated carriers. These merits enabled the BIT-Nd microspheres to exhibit strong piezo-photocatalytic activity.
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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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2023
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IF 6.4
Qi Zou,Qichi Le,Liang Ren,Chunyan Ban,Chenglu Hu,Yunchang Xin,Qing Liu,Wenyi Hu,Songhua Chen,Andrej Atrens
The corrosion behaviour of Nd alloyed magnesium alloy AZ80 in three simulated concrete pore solutions (SCPs) was studied using corrosion immersion tests and electrochemical tests. The study investigated the effects of the composition and pH of the SCPs on the corrosion properties of AZ80 and AZ80-1.0Nd using aluminum alloy AA6061 as a reference. The SCP1, SCP2, and SCP3 solutions were the simulated concrete pore solutions with different carbonation stages at pH 13.5, 12.5, and 9.7 respectively. The corrosion mainly in the form of localized corrosion, developed significantly along the transverse direction, and less in the vertical direction. AZ80 and AZ80-1.0Nd exhibited the best corrosion resistance in the SCP2 solution, which was attributed to the formation of a dense protective film on the surface. The corrosion in the high alkalinity SCP1 solution was first enhanced within 12 h and then somewhat decreased within 72 h attributed to the destruction and re-formation of the surface film. AA6061 corroded severely in the SCP1 solution and suffered significantly less corrosion in the SCP2 and SCP3 solutions. Nd alloying contributed to the reduced corrosion rates of AZ80 in the simulated concrete pore solutions, attributed to changes in the microstructure and electrochemical properties.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2023
·
IF 4.1
Mingxia Tian,Guyu Zhang,Xinlei Zhao,Yumin Yan,Jianbo Zhao,Hui Bai,Jianhui Jiang
Herein, Nd-ZnO/g-C 3 N 4 (NZCN) composites were obtained by doping rare-earth element Nd with ZnO using a hydrothermal method , coupled with g-C 3 N 4 (CN) electrostatic ultrasonic self-assembly. The NZCN composite exhibited an impressive methylene blue (MB) removal rate of 94.88 %, with a degradation rate of 0.02637 min −1 after 105 min exposure to 500 W xenon lamp irradiations. Comparatively, the degradation rate of MB by the NZCN composite was five and twice times higher than ZnO and CN samples, respectively. This significant improvement can be attributed to the synergistic effect of Nd, ZnO, and CN, which not only widened the light absorption range but also enhanced the density, separation, and transport of photogenerated electrons (e − ) and holes (h + ), thus improving the photocatalytic performance of the NZCN composites. An in-depth investigation into the photocatalytic reaction process was carried out using free-radical active-species capture experiments, confirming the critical role of h + . Furthermore, the reproducibility and stability of the NZCN composites were assessed over five experimental cycles, demonstrating consistent and stable MB degradation rates of 90.1 % while retaining the crystal structure unchanged. Overall, the construction of rare-earth-metal-doped ZnO and Z-type heterojunctions synergistically improves photocatalytic activity and provides a green and environmentally friendly approach for the removal of organics from wastewater.
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
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2023
·Vol. 99
·期 1
·109-119
·
IF 3.4
Qianmin Cong,Xiaoyu Wang,Chenxu Feng,Zizhan Sun,Chenxi Cai,Chuangang Fan,Lizhai Pei
BACKGROUND Cadmium ions may be discarded to the environment with living organisms from fossil fuel combustion, phosphate fertilizer and battery industries. It is urgent and essential to develop a sensitive and rapid method for monitoring Cd 2+ level in aquatic environments and biological systems. Neodymium vanadate possesses good catalytic performance for the electrocatalysis of heavy metal ions. Single crystalline Nd vanadate nanoribbons were obtained by a facile approach and used as electrode materials for electrochemical detection of Cd 2+ . RESULTS The Nd nanoribbons with tetragonal NdVO 4 phase possess length, width and thickness of longer than 10 μm, 200 nm to 1.5 μm and 50 nm, respectively. Nd vanadate nanoribbons can serve as a good electron transfer interface. An anodic peak is located at +0.56 V at the Nd vanadate nanoribbon-modified electrode in 0.1 mol L −1 KCl electrolyte containing 1 mmol L −1 Cd 2+ by square wave voltammetry technique. The Nd vanadate nanoribbon-modified electrode exhibits a linear range of 0.01–1000 μmol L −1 and a detection limit of 0.29 nmol L −1 , with good stability, reproducibility and selectivity for Cd 2+ detection. CONCLUSION The optimal measurement conditions including the pH value of the KCl solution, deposition time, deposition potential and standing time, which are pH 1, 180 s, −1.0 V and 60 s, respectively. The Nd vanadate nanoribbon-modified electrode shows great application potential for detecting heavy metal ions in liquid environments. © 2023 Society of Chemical Industry.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
高影响因子
Small Structures
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2024
·
IF 13.9
Kaina Wang,Jipeng Fu,Hongliang Dong,Bingyu Huang,Jinru Liu,Long Tian,Jing Feng,Chunzhen Yang,Chenjie Lou,Ligang Xu,Tianyi Sun,Huajie Luo,Shiqing Xu,Guowei Yin,Hongjie Zhang,Mingxue Tang
Near-infrared (NIR) phosphors have been widely used in biomedical applications based on their deep tissue penetration. However, the lack of blue-pumped NIR phosphors with emission ranges beyond 1000 nm has greatly limited the development of NIR phosphor-converted light-emitting diodes (pc-LEDs). Herein, a facile way to boost the luminescence efficiency and thermal stability by introducing the promoters of Ce 3+ and Na + into Nd 3+ -doped SrS NIR phosphor is demonstrated, thus achieving light emitting at 850–1500 nm with a peak wavelength of ≈1070 nm. Through sensitization by the allowed 4 f → 5 d transition of Ce 3+ , the SrS: Nd 3+ phosphors are excitable by using a commercial blue LED, attributing to the effective energy transfer between Nd 3+ and Ce 3+ . Besides, the structural analysis and density functional theory calculations reveal the lattice distortion mechanism and geometry of doping ions contributed to the weakened thermal quenching effect and the increasing of internal quantum efficiency. The optimized NIR phosphor luminescence intensity remains at 91.8% of the initial intensity at 393 K, and the internal quantum efficiency increases to 42.8% from 31.7% of the sample without Na + doping. The present exploration of Nd 3+ -doped NIR phosphors will provide a reference for designing NIR pc-LEDs with enhanced properties.
研究领域:
材料科学
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生物医学工程
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DOI
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
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shize Chen,Liming Luo,Hongjuan Sun,Tongjiang Peng,Jie Lei,Jin Yang,Zijun Xian
Industrial solid waste poses serious risks to the human living environment and health owing to its diversity and complexity. In this work, asbestos tailings and coal fly ash were used as raw materials, and the trivalent actinide nuclide was simulated using Nd 2 O 3 . The silicate glass-ceramics nuclide solidified body was successfully prepared through melting, water quenching, and sintering methods. The properties of the solidified body and the solidification mechanism of the nuclide were studied via X-ray diffraction, Scanning electron microscope-energy dispersive spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and Atomic pair distribution function analysis. The results showed that the solidified body prepared via the molten water quenching–sintering method exhibited a unique microcrystalline structure, with properties that were significantly superior to those of traditional glass solidified bodies. Increasing the amount of Nd 2 O 3 further enhanced the stability of the solidified body. However, when the amount of Nd 2 O 3 exceeded 22 wt%, both the compressive strength and bulk density of the sample decreased. Therefore, the optimal package capacity of the solidified body for the nuclide Nd was 22 wt%. The leaching experiment demonstrated that the normalised leaching rate of Nd stabilised after 14 d and reached the order of 10 −5 g m −2 d −1 after 42 d, which indicated that the solidified body had excellent curing ability for nuclides. Analysis of the glass network structure revealed that Nd elements formed short-range ordered structures with Al, Si, Mg, O, and other elements through non-bridging oxygen bonds, thus becoming fixed in the amorphous phase of the solidified body. When the amount of Nd 2 O 3 exceeded 20 wt%, some short-range ordered structures containing Nd transitioned to form long-range ordered structures, which were stabilised in the crystal phase through lattice solidification. Overall, this study provides an experimental and theoretical basis for the solidification of highly radioactive nuclides using industrial solid waste.
研究领域:
材料科学
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环境科学
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核废料处理
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Hao Wu,Guoxiang Wang,Xinxin Zhang,Qingwang Min,Jiacheng Wang,Dazhi Wang,Longsheng Cao
Water electrolysis is one of the most promising green hydrogen production technologies. However, using precious metal materials as electrodes for these electrolyzers incurs high costs. To address these challenges and simultaneously retain the catalytic activity of precious metals, we synthesize a low-iridium catalyst, Nd–IrO 2 . At 10 and -10 mA/cm 2 , this catalyst exhibits 233 and 36 mV overpotentials. Nd – IrO 2 maintains stability over prolonged operation in acidic environments, as evidenced by its consistent overpotential. Advanced calculations using density functional theory (DFT) have demonstrated that incorporating Nd and an ample amount of oxygen vacancies can modulate the d-band center of Ir and reduce the adsorption energy of electrochemical reaction intermediates. In summary, we present the synthesis of a low-iridium catalyst, which provides valuable insights for the design and development of catalysts with improved electrocatalytic performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）