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
MATERIALS TECHNOLOGY
·
2020
·
IF 1.738
Huan Yang,Renxin Xu,Yaohui Zhao,Jian Cai
Mg0.2Mn0.8NdxFe2-xO4 (x = 0.000, 0.025, 0.050, 0.075 and 0.010) nano crystalline is synthesized via hydrothermal technique. Single cubic spinel phase is confirmed by XRD and the formation of Mg0.2Mn0.8NdxFe2-xO4 is verified by EDS. The average size of the nanoferrites is examined by TEM image. Nd3+ substituted Mg-Mn nanoferrites exhibit the low saturation magnetization (Ms) and high coercivity (Hc). The ferrite composites present that the resistivity and the magnetic loss are less than 2.8×107 Ω·cm and 0.75 in the range of 2-18 GHz, respectively. The optimized Mg0.2Mn0.8NdxFe2-xO4 (x=0.050) showed the minimum reflection loss of -39.80 dB at 1.4 GHz and effective absorption bandwidth (lower than -10 dB) of 7.58 GHz with a thickness of only 3 mm. The high coercivity, resistivity and excellent wave absorption performance indicate that the addition of Nd3+ contributes to the synthesis of the excellent soft magnetic materials and wave absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2022
·Vol. 648
·期 16
·e202200090
·
IF 1.414
Cong Cao,Shiwen Li,Jinsong Wang,Yu Li,Guangshen Li
Nanothermometers that can reflect temperature in real-time are crucial for photothermal therapy. Near-infrared (NIR) fluorescent probes that conform to Boltzmann distribution will play an important role if they have the above characteristics. Here, the LiLuF 4 : Nd 3+ /Yb 3+ nanocrystals were designed and synthesized by control, exhibiting multiple bright near-infrared emission peaks at 925–1080 nm region at 280–360 K under the excitation of an 808 nm laser. The feasibility of being used as a nanothermometer was confirmed by testing the spectral variation with temperature and analysis.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chang Du,Shuai Ma,Meiying Xie,Fan Yang,Zhigang Zhao,Yun Chen,Ying Ma
This paper proposes a new integrated method for recycling permanent magnet waste by betaine hydrochloride ([Hbet]Cl) solution extraction. The orthogonal experiment method was used to analyze four factors in the leaching process to explore the primary and secondary factors influencing the leaching results. The following optimum leaching conditions were obtained: leaching temperature of 200 ℃, leaching time of 8 h, lixiviant [Hbet]Cl concentration of 0.2 mol/L, and solid–liquid ratio of 1:150 g/ml. These conditions yielded the optimum leaching results of 99.81 % Pr, 97.05 % Nd, 95.51 % Gd, 56.24 % Ce and 0.20 % Fe, and almost all iron oxide remained in the residue. Compared with the results for common lixiviants, the proposed method showed a better leaching rate and selectivity, and the leaching sequence was in line with established chemical properties. The method is characterized by a high recovery rate, strong selectivity, environmental friendliness and low cost. The leaching mechanism was analyzed, and the crystal lattice energy U values of ionic crystal decomposition were calculated to explain the dissolution sequence and solubility difference of metal oxides, laying a foundation for the recovery process.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2023
·
IF 1.8
Yong Hua,Dong Wang,Zhenjie Cui,Jianwei Guo,Jianwei Cao,Zhi Wang
In this paper, neodymium hydroxycarbonate (NdOHCO 3 ) was synthesized by carbon dioxide carbonatation. The effects of reaction temperature and aeration time of carbon dioxide (CO 2 ) on the morphology and phase of the carbonized products were studied. In addition, the carbonized process was analyzed to understand the evolution law of the crystalline phase. It was found that the relatively low supersaturation of bicarbonate ion was beneficial to the stable formation of NdOHCO 3 . While the supersaturation was relatively high, the NdOHCO 3 would continue to react with carbonic acid to form neodymium carbonate. The optical properties of NdOHCO 3 synthesized by this method were also studied, and the sample showed a strong broadband emission centered at 440 nm, which shows the potential applications in optical devices. NdOHCO 3 with uniform morphology and fine particle size was prepared by controlling the carbonatation process.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Ziqi Zhang,Yan Zhang,Kaida Yao,Weimin Huang,Tiejun Wang
Traditional bone implants are prone to postoperative infection due to their poor corrosion and antimicrobial resistance. Thus in this work, based on the original titanium base, we modified and synthesized a novel amorphous spherical metal-organic framework analogue nanoparticles with neodymium ions doped into them. This new rare earth element doped metal-organic framework and hydroxyapatite were co-deposited on titanium dioxide nanotube arrays by electrochemical method which can save a lot of time and energy compared to the traditional coating process. Most importantly, new coating can not only improve the corrosion resistance of the coating by increasing the resistance of the titanium sheet in SBF but also improve the antibacterial ability of Ti base without damaging the good biocompatibility of the titanium.
研究领域:
材料科学
·
生物医学工程
·
表面改性技术
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Solomon Tiruneh Dibaba,Yao Xie,Wensong Xi,Artur Bednarkiewicz,Wei Ren,Lining Sun
Combining treatment and diagnosis, called theranostics, which is achieved within single nanoparticle is an ultimate goal of many studies. Herein, we developed a new nanotheranostic agent − Nd 3+ -sensitized upconversion nanoparticles core for dual modal imaging (i.e., upconversion luminescence imaging and magnetic resonance imaging) and antimony nanoshell for photothermal therapy (PTT). The core-shell-shell upconversion nanoparticles (NaYF 4 :Yb,Er@NaYF 4 :Yb,Nd@NaGdF 4 :Nd, named as UCNP) were firstly synthesized using thermal decomposition method and then were coated by antimony shell over the surface of UCNP using simple cost and time effective new method. Furthermore, the surface of UCNP@Sb nanostructures was modified with DSPE-PEG in order to enhance the water solubility and biocompatibility. The final nanotheranostic agent, named as UCNP@Sb-PEG, exhibits very low toxicity, good biocompatibility, very good photothermal therapeutic effect, and efficient upconversion luminescence (UCL) imaging of HeLa cells under only one laser (808 nm) irradiation. The antimony shell is quenching the upconversion emission in pristine nanotheranostic agent, but interestingly, the UCL intensity of the agent recovers progressively under 808 nm laser irradiation due to light induced degradability of antimony shell. Besides, high longitudinal relaxivity ( r 1 ) obtained from the experiment approves excellent potential of the nanotheranostic agent for T 1 -weighted magnetic resonance imaging application.
研究领域:
纳米医学
·
生物材料
·
肿瘤学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 36
·30384-30394
·
IF 3.289
Peng Zhang,Yaling Wang,Dongxiang Zhang,Han Bai,Valeri V. Tarasov
Calixarene-functionalized graphene oxide (GO) composites were synthesized via esterification and polymerization of calix[n]arenes (n = 4, 6, 8) onto graphene oxide surfaces for the first time. The GO composites were used to adsorb Nd ions from the aqueous phase due to their quite high BET surface areas. In this work, the GO composites (GO-C4, GO-C6, and GO-C8) showed high adsorption capacities (232.56, 219.78, and 311.53 mg g−1, respectively) compared to GO (110.99 mg g−1) during the removal process and excellent efficiency in removing a high concentration of neodymium ions (1150 mg L−1) from water. The results indicate that the adsorption ability for Nd ions was in the order of GO-C8 > GO-C4 > GO-C6 > GO. The adsorption processes of GO-C4 and GO-C8 were completed within 185 min, whereas that of GO-C6 was achieved within 230 min. Furthermore, controlling the pH value of an aqueous solution in the range of 6, the GO composites exhibited the highest adsorption capacity toward Nd ions. For our process of removing Nd ions, the adsorption data of experiments mostly fit the pseudo-second-order model better than two other models. Four adsorption isotherm models were compared to study the details of the adsorption process, and the results indicated that the Freundlich model is the most suitable for describing the adsorption process of the GO composites. The adsorption mechanisms to remove Nd ions were the electrostatic attraction of Nd ions with hydroxyl functional groups and the complexation process of Nd ions with functional groups on the surface of the GO composite. Moreover, thermodynamic studies indicated that the adsorption behavior of the GO composites towards Nd ions was an endothermic and spontaneous natural process. In general, GO composites could potentially be applied to metal ion removal.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Xu Changji,He Wenbin,Xie Zhuojia,Zou Zhengguang
In this study, La 0.63 Sr 0.2 Nd 0.17 MnO 3 was synthesized by the sol-gel method, and its structural, morphological, magnetic, and magnetocaloric effects were investigated. The structural properties were analyzed by x-ray diffraction (XRD), and scanning electron microscopy (SEM) was used to characterize the morphology. An integrated magnetic measurement system was used to determine the magnetic properties. La 0.63 Sr 0.2 Nd 0.17 MnO 3 crystallized in a hexagonal crystal system with space group R -3 c . This was also confirmed by Rietveld refinement of the x-ray data from La 0.63 Sr 0.2 Nd 0.17 MnO 3 . With the doping of Nd 3+ , the cell volume decreases, which can be explained by the angles and bond lengths of the bonds between the Mn and O ions and the distortion of the lattice. Near the Curie temperature, La 0.63 Sr 0.2 Nd 0.17 MnO 3 exhibits significant magnetocaloric effects. The magnetic study of La 0.63 Sr 0.2 Nd 0.17 MnO 3 suggests that the transition from the paramagnetic to ferromagnetic phase can occur near the Curie temperature. The maximum magnetic entropy change and relative cooling power (RCP) of La 0.63 Sr 0.2 Nd 0.17 MnO 3 (298 K, 3 T) are 2.70 J/(kg K) and 135 (J/kg), respectively. The effect of f -orbitals on the magnetic properties of La 0.8 Sr 0.2 MnO 3 was investigated by first-principles calculations in density functional theory. Thus, it can be concluded that the magnetocaloric effects of the material after doping with f -orbital ions (Nd 3+ ) is enhanced compared to La 0.8 Sr 0.2 MnO 3 .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Zhen Shi,Chenxi Fang,Jiaqian Li,Sateesh Bandaru,Muwen Liu,Lizhong Zhao,Xuefeng Zhang
In spite of superior magnetic properties, neodymium–iron–boron (Nd-Fe-B) applications in harsh environments have been greatly hindered by their susceptibility to corrosion, humidity, mechanical, and temperature attacks. Herein, a construction strategy of robust slippery liquid-infused porous surfaces (SLIPS) coatings is proposed via the multi-dimensional design of surface, bulk coating, and interface. The manipulation of colloidal states of silica particles by chemical hydrophobization allows for building a dense polymer network, enhancing interfacial adhesion and locking lubricant film effectively. The resulting coating is demonstrated to be extremely stable, endowing the magnet with excellent liquid repellency, anti-corrosion, and anti-icing properties. Strikingly, no trace of corrosion is detected after 136-day immersion in 3.5 wt.% NaCl solution and the impedance modulus at 0.1 Hz can be maintained as the initial of 3.31 × 10 8 Ω·cm 2 even after 132-day immersion, which is far superior to that of commercial Ni-Cu-Ni, Zn, and EP coatings. Additionally, anti-icing performance at low temperatures is evidenced by the delayed icing time and decreased ice adhesion strength. Importantly, the self-healing property offers the surface intensified durability even after mechanical damage. This work demonstrates a construction strategy of robust SLIPS coatings with a multi-dimensional design, enabling the practical applications of Nd-Fe-B magnets in extreme environments like offshore wind turbines.
研究领域:
材料科学
·
表面工程
·
腐蚀防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Advances
·
2025
·
IF 4.7
Li-Ping Wang,Lu-Lu Jiang,Zong-Ze Cui,Zheng-Hui Hu,Le-Ping Miao,Jian-Rong Li,Heng-Yun Ye,Chao Shi
Hybrid perovskites are highly desirable for potential applicationsin optoelectronics. Although luminescent hybrid perovskites have a variety of technically important applications, achieving dielectric transition and near-infrared (NIR) luminescence properties simultaneously is still challenging. Herein, utilizing the NIR-luminescent properties of rare-earth ions, an Nd3+-containing nitrate-bridged hybrid bimetal dielectric, (MQ)5[K2Nd2(NO3)13] (1; MQ = N-methylquinuclidinium cation), was successfully constructed. It exhibited a switchable dielectric constant (ε′) between low- and high-dielectric states along with NIR-luminescent property. The contrast was strikingly reached 1.88, and the was 1.18 times higher than that of silicon nitride. Furthermore, the reversibility of the switchable dielectric constant between the and at 1 MHz was observed after many ε′-switching cycles with no obvious weakening, which endowed this material with the desirable thermodynamic stability. Notably, 1 exhibited NIR photoluminescence at 1068 nm with a fluorescence lifetime of 1.920 μs, and the Nd3+ ion acted as an activator of the NIR luminescence. This finding represents a significant step toward advanced NIR-emissive responsive dielectrics for optoelectronic applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Ting Wang,Ting Xu,Shang Gao,S.-H. Song
BiFeO 3 , BiFe 0.95 Nb 0.05 O 3 and Bi 1− x Nd x Fe 0.95 Nb 0.05 O 3 ( x =0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles are successfully synthesized via a tartaric acid-assisted sol-gel technique for the first time. The effect of Nd and Nb co-doping on the structure, morphology, and magnetic and optical properties is investigated. X-ray diffraction (XRD) and Raman measurements demonstrate that Nd 3+ ions and Nb 5+ ions co-doping at A and B-sites of BiFeO 3 can result in a structural transformation (from single rhombohedral phase ( R 3 c ) to two coexisting phases ( R 3 c and Pbam)). The morphology of the nanoparticles seems to be approximately cubic, and by the co-doping, the size of the nanoparticles decreases from ~132 to ~35 nm. Notable improvement in the remanent magnetization of the sample with x =0.15 is observed with a value of 0.285 emu/g, being 20 times higher than that of the undoped sample (BiFeO 3 ). A decrease in the optical band gap is also observed in the Nd and Nb co-doped nanoparticles, indicating their favorable potential in photocatalytic applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）