MATERIALS CHEMISTRY AND PHYSICS
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2024
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IF 4.3
Hao Tian,Jie Ma,Bai Yang,Ran Li,Ronghai Yu
It is necessary to broaden absorption bandwidth, regulate applied frequency, reduce the weight and maintain strong absorption for magnetic microwave absorbing materials by constructing suitable material structures to satisfy the requirements for wide applications in various electromagnetic devices. In this work, well-structured amorphous-Co@Nd(BO 2 ) 3 /rGO nanocomposites have been fabricated using a selective chemical reduction in a mixed aqueous solution containing Co 2+ and Nd 3+ ions along with GO sheets reduced by NaBH 4 as the reductant, in which only Co 2+ and GO but no Nd 3+ ions were reduced. Very low coercivity of 0.4 Oe is achieved in amorphous-Co@Nd(BO 2 ) 3 /rGO nanocomposites due to amorphous Co@Nd(BO 2 ) 3 core-shell nanoparticles uniformly anchored on rGO sheets. These soft magnetic rGO-based nanocomposites exhibit high-frequency microwave absorption performance including a minimum reflection loss ( RL min ) value of −84.09 dB at 15.38 GHz for a 2.1 mm thickness at an applied frequency range (12.31–18 GHz) covering almost the entire Ku band. Moreover, a much wider absorption band of 7.24 GHz (10.67–17.89 GHz, RL ≤ −10 dB) with a 2.3 mm thickness along with a RL min value of −35.92 dB is also achieved. These rGO-based magnetic composites also show good structural stability , low density and easily controlled material compositions along with facile chemical fabrication suitable for mass production, which promises their latent use in high-performance microwave absorbing devices. Crystallization behavior of a new amorphous Nd(BO 2 ) 3 phase was also investigated.
研究领域:
材料科学
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电磁工程
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纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yuezhou Wei,Khalid A.M. Salih,Kamal Rabie,Khalid Z. Elwakeel,Yasser E. Zayed,Mohammed F. Hamza,Eric Guibal
Alginate-PEI beads are functionalized by phosphorylation and applied for the sorption of Nd(III) and Mo(VI). The successful grafting of phosphoryl groups (as tributyl phosphate derivative) is characterized by FTIR and XPS analysis, elemental analysis, titration (pH PZC ), TGA, BET and SEM-EDX analyses. The multi-functional characteristics of the sorbent (i.e., carboxylic, hydroxyl, amine and phosphate groups) contribute in the binding of metal ions having different physicochemical behaviors. The sorption of Nd(III) is strongly increased by phosphorylation, while for Mo(VI) the enhancement is rather limited. Optimum sorption occurs at pH 3–4: maximum sorption capacity reaches up to 1.46 mmol Nd(III) g −1 and 2.09 mmol Mo(VI) g −1 ; sorption isotherms are fitted by the Langmuir equation. The equilibrium is reached within 30–40 min and the kinetic profiles are simulated by the pseudo-first order rate equation. The coefficients of the effective diffusivity are close to the self-diffusivity of Nd(III) and Mo(VI) in water; as a confirmation of the limited impact of resistance to intraparticle diffusion in the kinetic control. The sorbent is selective for Nd(III) over Mo(VI) and other alkali-earth or base metals (at pH close to 2.5–3). Metals can be readily desorbed using 0.2 M HCl/0.5 M CaCl 2 as the eluent. The loss in sorption does not exceed 5% at the fifth cycle, while desorption remains complete. A series of treatments (including acidic leachate, cementation, precipitation, sorption and elution) is successfully applied for the recovery of rare earths from Egyptian ore; with enrichment in the oxalate precipitate of Nd(III), Gd(III), Sm(III) and Eu(III).
研究领域:
环境科学
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材料科学
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化学工程
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分析化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
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2021
·
IF 4.126
Baoguo Zhang,Li Wang,Kefeng Pan,Weimin Zhang,Yubao Liu,Yongjian Zhang,Lipeng Zhang,Zhongning Shi
Inexpensive electrolyte systems and readily available rare-earth (RE) precursors are necessary for the facile recovery of RE metals at the lowest temperature, which will allow the sustainable development of RE metal-based industries. Inspired by previous reports on Nd electrodeposition in various expensive and specialized ionic liquids (ILs), herein, we developed a practical, green, and cost-effective Nd-containing solvate IL composed of an organic solvent [(1,3-dimethyl-2-imidazolidinone)] and Nd (CF3SO3)3; the IL is well suited for Nd electrodeposition using LiNO3. The electrolyte structure and electrochemical mechanism of the IL were elucidated through physicochemical analyses and cyclic voltammetry. The role of nitrate was investigated in detail. Nd was successfully electrodeposited using the proposed method, as confirmed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction analyses. Thus, this work provides a firm theoretical basis and a practical strategy for the cost-effective bulk electrochemical extraction of RE metals at relatively low temperatures.
研究领域:
材料科学
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电化学
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2012
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IF 5.602
Huan Guo,Cui Ye,Hanchang He,Zhiwu Chen,Jianqiang Hu,Guanqi Hu,Aiqing Li
Neodymium (Nd) substituted bismuth titanate (Bi 4− x Nd x Ti 3 O 12 , BNTO- x ) nanoplates inlaid one another were prepared by sol–gel hydrothermal method, which was explored for protein immobilization and biosensor fabrication. Comparative experiments witnessed that Bi 3+ ions in bismuth titanate (Bi 4 Ti 3 O 12 , BTO) were successfully substituted with Nd 3+ ions, and the electrochemical properties of the Hb–Chi–BNTO biosensors closely depended on the Nd 3+ ion content. With increasing the Nd 3+ doping content, the electrochemical performance of the Hb–Chi–BNTO- x biosensors showed regularly variable. Moreover, compared with the Hb–Chi–BTO and other Hb–Chi–BNTO- x biosensors, the Hb–Chi–BNTO-0.85 biosensor had more excellent electrochemical and electrocatalytic properties such as stronger redox peak currents (approximately three-fold), smaller peak-to-peak separation (50 mV), larger heterogeneous electron transfer rate (14.1 ± 3.8 s −1 ), higher surface concentration of electroactive redox protein (about 8.16 × 10 −11 mol/cm 2 ), and better reproducibility and stability. The Nd-depended electrochemical properties of the Hb–Chi–BNTO biosensors may open up a new idea for designing third-generation electrochemical biosensors, and the BNTO-0.85-based biosensor is also expected to find potential applications in many areas such as biomedical, food, and environmental detection.
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DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2017
·Vol. 48
·期 5
·2535-2542
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IF 1.642
Zhang Zhong-Lin,Zhou Lin-Zong,Ji De-Bin,Yan Yong-De,Hong Wei,Liu Yu-Hui,Wang Pu,Yin Tai-Qi,Zheng Jia-Ning,Xue Yun,Ye Yuan-Feng
Electrochemical behavior of Nd was studied in NaCl-KCl melt on W and Cu electrodes via cyclic voltammetry and chronopotentiometry. Generally, the reduction of Nd 3+ takes place in two consecutive steps in molten chlorides, such as LiCl-CaCl 2 , LiCl-BaCl 2 , CaCl 2 -NaCl, LiCl-KCl melts. However, the reduction of Nd 3+ ions was found to be through a one-step process: Nd 3+ + 3e − → Nd. The co-reduction behavior of Nd 3+ and Cu 2+ ions and the mechanisms of alloy formation were investigated in NaCl-KCl melt on W electrodes at 988 K (715 °C). Four potential plateaus corresponding to four different kinds of Cu-Nd intermetallic compounds were detected. Cu-Nd alloys were prepared on Cu electrodes at 988 K (715 °C) and 1143 K (870 °C). At 988 K (715 °C), Cu 5 Nd phase was identified by X-ray diffraction. The morphology and micro-zone chemical analysis of the alloys were characterized by scanning electron microscopy equipped with energy-dispersive spectrometry. The alloy film was observed on the Cu electrodes. Moreover, at 1143 K (870 °C), a globate bulk Cu-Nd alloy with Cu 5 Nd, Cu 4 Nd, Cu 2 Nd, CuNd, and Cu phases, as liquid in the melt, was obtained at the bottom of the crucible.
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
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2023
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IF 4.3
Dong Wu,Huihui Ming,Wei Wu,Wenjie Yu,Gaowei Zhang,Jinzhu Gu,Meng Cui,Xueyong Huang,Fangjian Ning,Liping Luo
Light quality affects plant leaf growth and its metabolism of amino acids and polyphenols. Anoectochilus roxburghii has been used for food , medicine, and ornamental purposes. To obtain the optimal light quality for improved accumulation of metabolites in A. roxburghii in vitro . The seedings were cultured under the white light (W), blue light (B), red light (R), red: blue light = 1:2 (R1B2), red: blue light = 1:1 (R1B1), red: blue light = 2:1 (R2B1). Twenty compounds in raw leaves were in situ rapidly identified within 20 s by neutral desorption-extractive electrospray ionization mass spectrometry (ND-EESI-MS) without any sample pretreatment, including eight amino acids , eleven polyphenols, and kinsenoside. Meanwhile, leaf area and the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were evaluated. Our results showed that leaf area and antioxidant enzyme activities of the R2B1 were significantly higher than B or R group. The red-blue light increased the content of isoleucine , histidine , serine , arginine, and promoted the accumulation of caffeic acid , ferulic acid , quercetin , myricetin , kaempferol , and rutin in phenylpropane metabolism, especially in the R2B1, which could be used as the optimal light quality. ND-EESI-MS could enhance our understanding of the effect of light quality on the accumulation of amino acids and polyphenols in A. roxburghii .
研究领域:
植物学
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代谢组学
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药用植物研究
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
P. Velusamy,M. Sathiya,Yunpeng Liu,Shanhu Liu,R. Ramesh Babu,Mohamed Aly Saad Aly,E. Elangovan,Haibo Chang,Liqun Mao,Ruimin Xing
A two-step thermal poly-condensation and hydrothermal method is used to prepare noble metal-free nano-heterostructure of neodymium (Nd)-doped graphitic carbon nitride (g-C 3 N 4 ) and bismuth oxyiodide (BiOI). The synthesised Nd- doped g-C 3 N 4 /BiOI heterostructure shows high electron-hole separation. Moreover, a fast charge transport at the heterojunction is noted and further leads to low charge recombination rate. Consequently, the synthesised heterostructure overcomes the high charge recombination rate of g-C 3 N 4 . This work reports the effect of Nd- doping and the formed heterojunction on the structural, optical, electrical conductivity and photoelectrochemical (PEC) properties of the heterostructure. Moreover, introducing Nd dopant into g-C 3 N 4 enhances visible light absorption of g-C 3 N 4 . The optimal hetero-nanostructure (5.0 wt% Nd doped g-C 3 N 4 /BiOI) shows high photocurrent density (15.50 mA/cm 2 ) and hydrogen evolution rate (288 μmol h −1 cm −2 ) under visible light (λ ≥ 420 nm) illumination when compared to other wt.% of Nd doped g-C 3 N 4 and heterostructure. Additionally, the low emission features obtained from the photoluminescence studies and the heterojunction visually observed by HRTEM strongly emphasise that the formation of heterostructure leads to low recombination of charge carriers. Doping and forming heterostructure is shown to be an effective, controllable and an optimal approach to improve the PEC water splitting performance of g-C 3 N 4 .
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2014
·Vol. 406
·期 29
·7705-7714
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IF 3.578
Huang X. Y.,Fang X. W.,Zhang X.,Dai X. M.,Guo X. L.,Chen H. W.,Luo L. P.
Herein, we constructed a platform of neutral desorption-extractive electrospray ionization mass spectrometry (ND-EESI-MS) for direct and rapid detection of chloramphenicol (CAP) in honey samples diluted with methanol. Under the optimized working conditions, the quantitative information of CAP residues was acquired effectively by EESI-Ion Trap MS n . Using heated methanol-N 2 as spray reagent, we reduced the limit of determination (LOD) from 73.3 ng/mL to 0.3 ng/mL, and the CAP detection is linear in the range of 1–5000 ng/mL ( R = 0.9947). For the honey samples with CAP of 10, 100, and 1000 ng/mL, the recoveries were 133.0, 80.6, and 101.1 %, and the relative standard deviations were 5.96, 8.82, and 8.71 %, respectively. The reproducibility assays showed the stability of this method. Therefore, this ND-EESI-MS method is powerful for direct, rapid, and quantitative CAP analysis in honey samples with high sensitivity, precision, and specificity.
In the current neutral desorption-extractive electrospray ionization mass spectrometry (ND-EESI-MS) method, N 2 is inlet into samples to desorb chloramphenicol (CAP). We tried to use some organic solvents as the spray reagent to dissolve CAP, and then the best neutral desorption efficiency was obtained when using methanol. We applied this modified ND-EESI-MS method to detect CAP in honey samples only with sample dilution. The limit of CAP detection was then reduced from 73.3 to 0.3 ng/mL, reaching the current EU standard. Therefore, this is a powerful method for direct, rapid, and quantitative CAP analysis in honey samples.
研究领域:
分析化学
·
食品安全
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DOI
PubMed
高影响因子
ChemistrySelect
·
2026
·Vol. 11
·期 25
·e73736
·
IF 2.3
Qianqian Zhang,Gala Sa,Aiju Xu
Conventional water treatment processes are unable to effectively degrade metronidazole (MNZ), leading to its accumulation in wastewater and posing a serious threat to aquatic environments and human health. Photocatalysis offers an environmentally friendly and stable method for removing organic pollutants. However, zinc oxide (ZnO) has a large bandgap, limiting its light absorption to the ultraviolet region. To overcome this limitation, this study synthesized a series of Nd-ZnO catalysts with different neodymium molar ratios (0.2%, 0.5%, 0.7%, and 1.0%) via a one-step hydrothermal method. UV–vis spectroscopy confirmed that the bandgap decreased from 3.22 to 3.18 eV after Nd doping, while the photocurrent response was enhanced and the e − –h + recombination rate was reduced. When the catalyst dosage was 10 mg and the initial MNZ concentration was 10 mg·L −1 , the degradation efficiency of 0.5 mol% Nd-ZnO reached 94.3% after 180 min of irradiation with a 400 W metal halide lamp. First-order reaction kinetics fitting yielded a reaction rate constant of 0.013 min −1 , which is 1.7 times that of pure ZnO; after five cycles, the degradation efficiency remained as high as 87.7%. It provides an effective photocatalyst for the treatment of antibiotic wastewater and offers important insights into the performance of rare-earth-modified ZnO. Graphical Nd-ZnO catalyst was synthesized via a one-step hydrothermal method. The incorporation of Nd introduces an unfilled 4f electronic structure, which can capture electrons, thereby suppressing the recombination of e − /h + pairs and effectively inhibiting photogenerated electron–hole recombination, thus enhancing the photocatalytic efficiency. The 0.5 mol% Nd-ZnO achieved a degradation efficiency of 94.3% for metronidazole within 180 min and retained 87.7% activity after five cycles.
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Daqian Wu,Fengxian Zhou,Kai Feng,Jun Wang,Qixuan Lu,Xiaowu Wang,Zijun Zhan,Weiwei Chen,Zhengzheng Liu,Zeyu Zhang,Zhiping Hu,Juan Du
Lead halide perovskite quantum dots (QDs) have garnered significant attention due to their tunable band gaps, unique quantum confinement effects, and high photoluminescence quantum yields (PLQYs). Among them, Organic-inorganic QDs make them promising candidates for optoelectronic devices such as quantum dot light-emitting diodes (QLEDs), solar cells, lasers, and photodetectors. However, the toxicity of lead (Pb) has raised environmental and health concerns, hindering their industrial application. To alleviate concerns about heavy metals Pb, extensive research has been conducted on B-site doping and the development of lead-free perovskites. Herein, we firstly developed B-site doping strategy on organic-inorganic hybrid perovskite QDs via rare-earth elements. Neodymium (III) (Nd 3+ ) doped FAPbBr 3 QDs were prepared through the ligand-assisted reprecipitation method at room temperature. The B-site doping strategy could alleviate the heavy metal problem of Pb and modulate the band gap of FAPbBr 3 QDs facilely. The results demonstrated that increasing the concentration of Nd³⁺ can change the emission of FAPbBr₃ QDs from pure green to deep blue. Specifically, we achieved highly pure blue emission (∼438 nm) with a full width at half maximum (FWHM) of 13 nm for Nd³⁺-doped FAPbBr₃ QDs. Time-resolved photoluminescence (TRPL) spectroscopy revealed a decrease in the lifetime of FAPbBr₃ QDs from 22.86 to 15.46 ns as the doping concentration increased. Additionally, we fabricated a white LED (WLED) utilizing blue-emitting Nd³⁺-doped FAPbBr₃, green-emitting FAPbBr₃ QDs, and red QDs, achieving a white emission color coordinate of (0.33, 0.36). This study pioneers the application of B-site rare-earth doping in organic-inorganic hybrid perovskite QDs, demonstrating that B-site composition engineering is a reliable strategy to further exploit the perovskite family for wider optoelectronic applications.
研究领域:
材料科学
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光学工程
·
电子工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
·
IF 5.8
Yongzhi Luo,Bin Wang,Shengquan Yu,Zhongben Pan,Bin Kang,Jianguo Deng,Xiaoqiang Li
Highly transparent (Nd 0.01 Y 0.99- x Sc x ) 2 O 3 ceramics with varying Sc 3+ content were successfully fabricated by vacuum sintering at 1750 °C followed by hot isostatic pressing at 1650 °C with 1 mol% ZrO 2 as sintering additive. The effect of Sc 3+ substitution on the crystal structure, microscopic morphology, optical transmittance and spectroscopic properties was investigated systematically. By increasing the Sc 3+ content, the lattice shrinked and the mean grain size increased. The optical transmittances of 5-mm-thick samples with x = 0, 0.03 and 0.09 were above 80 % at 650 nm and 82 % at 1100 nm. With the increasing of Sc 3+ , the main emission peaks of Nd 3+ near 1080 nm shift toward longer wavelength. Continuous wave (CW) laser operation for transparent (Nd 0.01 Y 0.99 ) 2 O 3 and (Nd 0.01 Y 0.90 Sc 0.09 ) 2 O 3 ceramics were end-pumped for laser diode at 808 nm. The maximum output power of 1.79 W with an optical-to-optical conversion efficiency of 17.6 % was obtained in (Nd 0.01 Y 0.90 Sc 0.09 ) 2 O 3 ceramics for the first time.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Huining Huang,Huiliang Li,Zeyan Wang,Peng Wang,Zhaoke Zheng,Yuanyuan Liu,Ying Dai,Yingjie Li,Baibiao Huang
In this work, we fabricated NaYF 4 :Yb 3+ ,Tm 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @TiO 2 (Tm@Nd@TiO 2 ) core@shell nanoparticles and investigated their near-infrared (NIR) photocatalytic activities. Comparing to traditional TiO 2 based upconversion (UC) photocatalysts (i.e., NaYF 4 :Yb 3+ ,Tm 3+ @TiO 2 , named Tm@TiO 2 ), Tm@Nd@TiO 2 exhibits enhanced photocatalytic activity under NIR light irradiation. The photocatalytic activity of Tm@Nd@TiO 2 under 980, 808, and 980 + 808 nm laser irradiation is 4.40, 5.84, and 9.83 times as high as that of Tm@TiO 2 under only 980 nm irradiation, respectively. The ethylene degradation rate of Tm@Nd@TiO 2 under 980 + 808 nm laser irradiation is 6.4 times as that of Tm@TiO 2 . The photocatalytic activity of Tm@Nd@TiO 2 under visible + NIR irradiation is even comparable with (∼2/3) that under UV light irradiation during Rhodamine B (RhB) degradation. The enhanced photocatalytic activity of Tm@Nd@TiO 2 can be attributed to the stronger light absorption in NIR region ascribed to Nd 3+ , lower water absorption and the enhanced UC emission of Tm@Nd with unique core@shell nanostructures. This work can provide a possible route to improve the NIR photocatalytic activity and stimulate the applications in many other fields.
研究领域:
材料科学
·
光催化技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）