Small Methods
·
2024
·
IF 10.7
Ruizhe Hu,Xue He,Yuqi Luo,Chongbo Liu,Shiyu Liu,Xintong Lv,Jinxi Yan,Yuhui Peng,Mingyue Yuan,Renchao Che
Structural design and interface regulation are useful strategies for achieving strong electromagnetic wave absorption (EMWA) and broad effective absorption bandwidth ( EAB ). Herein, a monomer-mediated strategy is employed to control the growth of covalent organic framework (COF) wrapping flower-shaped Gd-doped FeNi 3 (GFN), and a novel raspberry-like absorbent based on biomimetic design is fabricated by thermal catalysis. Further, a unique dielectric-magnetic synergistic system is constructed by utilizing the COF-derived nitrogen-doped porous carbon (NPC) as the shell and anisotropic GFN as the core. The electromagnetic parameters of the GFN@NPC composites can be tuned by adjusting the proportions of GFN and NPC. Off-axis electron holography results further clarify the interface polarization and microscale magnetic interactions affecting the EMW loss mechanism. As a result, the GFN@NPC samples exhibit broad EMWA performance. The EAB values of all GFN@NPC composites reach up to 6.0 GHz, with the GFN@NPC-2 sample showing a minimum reflection loss ( RL min ) of −69.6 dB at 1.68 mm. In addition, GFN@NPC-2 achieves a maximum radar cross–section (RCS) reduction of 29.75 dB·m 2 . A multi-layer gradient structure is also constructed using metamaterial simulation to achieve an ultra-wide EAB of 12.24 GHz. Overall, this work provides a novel bio-inspired design strategy to develop high-performance EMWA materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Keyu Cui,Baihui Gao,Meng Tai,Bin Su
Rapid development of rare earth industry has led to an increasing demand for highly purified rare earth elements (REEs). The combination of ion-imprinted technique (IIT) and membrane separation technique (MST) is recently regarded as a promising strategy for selectively separating specific ions from multiple REEs. In this work, a facile bionic strategy for preparation of Gd (III)-imprinted membranes (GIMs) were developed via interlaced stacking of one-dimensional Gd (III)-imprinted carbon nanotubes (GICNTs) and two-dimensional polydopamine-modified graphene oxide (pDA@GO). Polydopamine was synthesized on graphene oxide to large enhance the interfacial adhesion, and ion-imprinting polymerization is implemented on carbon nanotubes (CNTs) by direct cross-link of linear polymers. The obtained materials are characterized in detail by FTIR, SEM, TEM and AFM to explorer the evolution of chemical composition and morphology. Selectivity towards Gd (III) is obtained by isothermal adsorption, kinetic adsorption and time-depended permeation. Isothermal and kinetic models are fitted with adsorption data to obtain the mechanism of selective separation on GIMs. The as-synthesized GIMs with high permeation selectivity (2.91 and 2.49) towards Gd (III) and stable permeation regeneration would potentially be applied to separation and purification of specific ions form multiple REEs.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Ritao Huang,Jin Zhou,Yi Yang,Qingyuan Zeng,Jingxin Li,Langsheng Ling,Wei Tong,Zhaoming Tian
Two-dimensional rare earth (RE)-based honeycomb lattice magnets provide a fertile platform for exploring exotic magnetic ground states in view of reduced spatial dimensionality and anisotropic exchange interactions, while the reported 2D honeycomb lattice materials are quite limited. Herein, we report a family of quasi-two-dimensional layered RE-based honeycomb lattice magnets RE2Te4O11 (RE = Gd–Er and Yb), where the magnetic honeycomb layers are well separated by nonmagnetic TeO4 polyhedra with large interlayer distances of 8.353–8.452 Å. Magnetic susceptibility characterizations reveal that all synthesized RE2Te4O11 (RE = Gd–Er and Yb) compounds exhibit dominant antiferromagnetic (AFM) interactions; three RE2Te4O11 (RE = Gd, Tb, and Dy) family members show magnetic transitions with Néel temperatures (TN) of 1.97, 3.61, and 2.52 K, respectively. For Tb2Te4O11, a field-induced spin-flop transition is observed below TN = 3.61 K in the isothermal magnetization M(B) curves. Based on the analysis of the magnetocaloric effect (MCE), a crossover behavior is observed from the inverse MCE at low fields (ΔB < 1.8 T) to conventional MCE at high fields (ΔB > 1.8 T) below the TN in Tb2Te4O11; this is in contrast to the conventional MCE in all measured field regions in other RE2Te4O11 compounds.
研究领域:
凝聚态物理
·
磁性材料
·
低维量子系统
·
固态化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2017
·Vol. 101
·期 3
·1266-1278
·
IF 2.841
Lin Chen,YeHua Jiang,XiaoYu Chong,Jing Feng
Thermal barrier coatings (TBCs) are one of the most important materials in gas turbine to protect the high temperature components. RETa 3 O 9 compounds have a defect-perovskite structure, indicating that they have low thermal conductivity, which is the critical property of TBCs. Herein, dense RETa 3 O 9 bulk ceramics were fabricated via solid-state reaction. The crystal structure was characterized by X-ray diffraction (XRD) and Raman Spectroscope. Scanning electron microscope (SEM) was used to observe the microstructure. The thermophysical properties of RETa 3 O 9 were studied systematically, including specific heat, thermal diffusivity, thermal conductivity, thermal expansion coefficients, and high-temperature phase stability. The thermal conductivities of RETa 3 O 9 are very low (1.33-2.37 W/m·K, 373-1073 K), which are much lower than YSZ and La 2 Zr 2 O 7 ; and the thermal expansion coefficients range from 4.0 × 10 −6 K −1 to 10.2×10 −6 K −1 (1273 K), which is close to La 2 Zr 2 O 7 and YSZ. According to the differential scanning calorimetry (DSC) curve there is not phase transition at the test temperature. Due to the high melting point and excellent high-temperature phase stability with these oxides, RETa 3 O 9 ceramics were promising candidate materials for TBCs.
研究领域:
材料科学
·
热物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 4
·2727-2740
·
IF 3.094
Fushuo Wu,Peng Wu,Yunxuan Zhou,Xiaoyu Chong,Jing Feng
In this work, RENbO 4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics with low density, low Young's modulus, low thermal conductivity, and high thermal expansion have been systematically investigated, the excellent thermo-mechanical properties indicate that RENbO 4 ceramics possess the potential as the new generation of thermal barrier coatings (TBCs) materials. X-ray diffraction and Raman spectroscopy phase structure identification reveal that all dense bulk specimens obtained by high-temperature solid-state reaction belonged to the monoclinic (m) phase with C12/c1 space group. The ferroelastic domains are detected in the specimens, revealing the ferroelastic transformation between tetragonal (t) and monoclinic (m) phases of RENbO 4 ceramics. The Young's modulus and hardness of the RENbO 4 ceramics measured by the NanoBlitz 3D nanoindentation method are discussed in details, and the lower Young's modulus (60-170 GPa) and higher hardness (the maximum value reaches 11.48 GPa) indicating that higher resistance of RENbO 4 ceramics to failure and damage. Lower thermal conductivity (1.42-2.21 W [m k] −1 at 500°C-900°C) and lower density (5.330-7.400 g/cm 3 ) than other typical TBCs materials give RENbO 4 ceramics the unique advantage of being new TBCs materials. Meanwhile, the thermal expansion coefficients of RENbO 4 ceramics reach 9.8-11.6 × 10 −6 k −1 and are comparable or higher than other typical TBCs materials. According to the first-order derivative of the thermal expansion rate, the temperature of the ferroelastic transformation of RENbO 4 ceramics can be observed.
研究领域:
材料科学
·
固体力学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·
IF 13.3
Ya-Xiang Han,Chun-Li Hu,Jiang-Gao Mao
The first examples of thioborate-thiosilicates, namely Ca 2 Ln(BS 3 )(SiS 4 ) (Ln = La, Ce, and Gd), are synthesized by rationally designed high-temperature solid-state reactions. They crystalize in the polar space group P 6 3 mc and feature a novel three-dimensional crystal structure in which the discrete [BS 3 ] 3− and [SiS 4 ] 4− anionic groups are linked by Ca 2+ and Ln 3+ cations occupying the same atomic site. Remarkably, all three compounds show comprehensive properties required as promising infrared nonlinear optical materials, including phase-matchable strong second harmonic generation (SHG) responses at 2.05 µm (1.1–1.2 times that of AgGaS 2 ), high laser-induced damage thresholds (7–10 times that of AgGaS 2 ), wide light transmission range (0.45–11 µm), high thermal stabilities (>800 °C), and large calculated birefringence (0.126–0.149 @1064 nm), which justify the material design strategy of combining [BS 3 ] 3− and [SiS 4 ] 4− active units. Theoretical calculations suggest that their large SHG effects originate mainly from the synergy effects of the LnS 6 , BS 3 , and SiS 4 groups. This work not only broadens the scope of research on metal chalcogenides but also provides a new synthetic route for mixed anionic thioborates.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Girma Sisay Wolde,Dong-Hau Kuo,Merga Hailemariam Urgesa,Tadele Negash Gemeda
Simultaneous oxidation of benzyl alcohol (BA) and reduction of p-dinitrobenzene (p-DNB) over Gd-doped TiO 2 nanorods decorated with poly(o-phenylenediamine, PoPD) nanowires was reported in this work. The doping of TiO 2 with Gd induced surface defects, i.e., oxygen vacancy (OV) and the Ti 3+ –on-Ti 4+ site, while incorporating PoPD highly enhanced the light absorption capability and electron conductivity of TiO 2 nanorods , as confirmed by UV–vis diffuse reflectance spectroscopy (DRS) and electrochemical measurements, respectively. BA was selectively oxidized by photogenerated h + to form benzaldehyde with a yield of 70.5% in water and 90.6% in acetonitrile solvent. Conversely, p-DNB was selectively reduced to p-nitroaniline (p-NA) with a yield of 89.1% in acetonitrile and to p-phenylenediamine (p-PDA) of 85.0% yield in water. This work demonstrates a vital strategy to utilize the full economic potential of photogenerated charge carriers and the decisive role of solvent for product selectivity in the course of selective organic transformations.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 9
·4457-4468
·
IF 6.7
Chao Cai,Feng Tian,Junping Ma,Zipei Yu,Mo Yang,Changqing Yi
Precision medicine urges the development of theranostics which can efficiently integrate precise diagnosis and effective therapy. In this study, a facile synthesis of Ir/Gd bimetallic oxide nanotheranostics (termed BSA@Gd2O3/IrO2 NPs) with good biocompatibility was demonstrated using a biomineralization method where bovine serum albumin (BSA) served as a versatile template. BSA@Gd2O3/IrO2 NPs exhibited high longitudinal relaxivity (5.2 mM−1 s−1) and X-ray absorption capability (14.5 Hu mM−1), illustrating them to be a good contrast agent for magnetic resonance (MR) and computed tomography (CT) dual-modal imaging. Moreover, BSA@Gd2O3/IrO2 NPs can act as not only a photothermal conversion agent with ultrahigh efficiency (66.7%) as well as a good photosensitizer, but also an effective catalase to decompose endogenous H2O2 to produce O2, thus relieving hypoxia and enhancing the phototherapeutic effect. Both in vitro and in vivo experiments demonstrated the high effectiveness of BSA@Gd2O3/IrO2 NPs in MR/CT dual-modal imaging and photothermal and photodynamic synergistic tumor treatments. This work sheds new light on the development of versatile nanotheranostic systems using mild and robust biomineralization methods.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CORROSION SCIENCE
·
2022
·
IF 7.72
Yanan Cui,Zhice Yang,Tao Zhang,Fuhui Wang
The inhibition mechanism of four inhibitors with different charge on Mg-Gd-Y alloy was investigated experimentally and theoretically. The different charge of inhibitor evoked the preferential adsorption behavior, changing the susceptibility of Mg-Gd-Y alloy to micro-galvanic corrosion. Moreover, the adsorption of inhibitor changed the surface energy of embryos of corrosion product, and strongly suppressed the nucleation rate of corrosion product, leading to poor protective performance. Thus, the inhibitor with anion, exhibiting satisfactory inhibition efficiency for AZ/AM series alloys, showed worse inhibition for the Mg-Gd-Y alloy. Finally, the strategy to select and/or synthesize inhibitors for Mg-RE alloys was presented.
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shuopan Dun,Siqi Zhang,Xugeng Guo,Jinglai Zhang
Introducing upconversion nanoparticles (UCNPs) onto photoanode films is an effective way to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). In this contribution, the β -NaYGdF 4 :Yb, Er UCNPs and β -NaYGdF 4 :Yb,Er@SiO 2 nanoparticles (NPs) were prepared by tuning the dopant contents of the Gd ions and the β -NaYGdF 4 :Yb,Er@SiO 2 NPs were applied as an upconverting layer in DSSCs. Upconversion photoluminescence indicates that the UCNPs doped with 5% Gd ions exhibit the strongest green and red fluorescence emissions . Moreover, the DSSCs device incorporating the NPs with 5% Gd ion dopant can achieve an optimal photovoltaic efficiency of 5.89%, which is 20.20% enhancement in comparison to the device without NPs and 16.17% increasement with respect to the device containing β -NaYF 4 :Yb,Er@SiO 2 nanocrystals , thus highlighting the effect of the doping of the Gd ions in nanoparticles on their upconversion photoluminescence and photoelectric performance. Accordingly, the current results offer a feasible strategy for further regulating the photoluminescence property of UCNPs and optimizing the photovoltaic performance of UCNPs-based DSSCs devices.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL DAIRY JOURNAL
·
2022
·
IF 3.572
Xianglin Yue,Junru Sun,Ru Zhao,Jinsheng Zhang
Rapid screening and early warning of pathogenic bacteria in food is the key to prevent and control the spread of foodborne diseases . Biotin–streptavidin system and membrane filtration technology were combined to develop a novel nuclear magnetic resonance (NMR) immunosensor based on biomacromolecule O-carboxymethyl chitosan (O-CMCS) target gadolinium (Gd) probe for rapid detection of Salmonella anatum in milk. Under optimal experimental parameters, the proposed NMR immunosensor could detect Salmonella in milk with a limit of detection of 1.8 × 10 4 cfu mL −1 within 2 h. Furthermore, the immunosensor exhibited good specificity, sensitivity and reproducibility, which could achieve the direct determination of biological samples with complex composition. Hence, the developed assay might have great application potential for the rapid detection of Salmonella in food.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Yongxiang Wang,Guocan Shen,Ting Tang,Jinming Zeng,Rizwan Ur Rehman Sagar,Xiaopeng Qi,Tongxiang Liang
Electrochromic capacitors are attracting a huge attention due to their dual functions in energy-saving and energy storage. Electrochromic and energy storage performance of the films could be effectively improved through regulating their physical phase and morphology. In the present work, the physical phase and morphology of the WO 3 nanofilms were regulated by doping RE ions (RE = Ce, Eu, Sm, Gd) using one-step hydrothermal technology. The three-dimensional (3D) urchin-like crystal WO 3 nanofilm would transfer into the 3D nest-like WO 3 (WO 3 -RE) nanofilms that consisted of crystal and amorphous phase by doping RE ions. Compared with the pure WO 3 nanofilm, the WO 3 -RE nanofilms exhibited higher optical contrast, faster switching speed, longer cyclic stability, and larger areal capacitance owing to faster ions transfer rate and more stable film structure. The optical contrast of WO 3 -Eu and WO 3 -Sm nanofilms were 76.3% and 73.8% at 633 nm, 75.5% and 74.6% at 900 nm wavelength, respectively. Notably, the WO 3 -Eu and WO 3 -Sm nanofilms could retain 99.6% and 99.1% of their original optical contrasts after 1000 cycles, respectively. Additionally, the areal capacitance of ECDs based on the WO 3 /PB, WO 3 -Ce/PB, WO 3 -Eu/PB, WO 3 -Sm/PB, and WO 3 -Gd/PB were 26.15, 49.27, 58.23, 71.46, and 79.52 mF/cm 2 at 0.3 mA/cm 2 , respectively. ECDs based on the WO 3 -RE/PB are promising for energy-saving and energy storage dual functional smart windows.
✓ 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）