JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Wei Wang,Jian Bao,Changhao Wang,Guoqiang He,Xin Wang,Diming Xu,Biaobing Jin,Zhongqi Shi,Moustafa Adel Darwish,Yawei Chen,Qixin Liang,Meirong Zhang,Di Zhou
The advancement of millimeter-wave communication desires the ceramic substrate with low permittivity ( ԑ r ) to meet the requirements of high transmission rates, low latency and wide bandwidth. However, the thermal conductivity of most low- ԑ r ceramics is too low to deal with heat dissipation in millimeter-wave applications. In this paper, we reported novel dielectric ceramics Li M SiO 4 ( M = Ga, Sc and Y) with excellent performances of low ԑ r (< 10) and high thermal conductivity (> 6 W mK −1 ). Their dielectric properties in both microwave and THz were investigated, where the LiGaSiO 4 ceramic achieved the lowest ԑ r of ∼5.2, the LiScSiO 4 ceramic presented extremely low loss ( Q × f ∼ 96,700 GHz, Q = 1/dielectric loss, f is resonant frequency), and the LiYSiO 4 ceramic showed a positive temperature coefficient of f (TCF ∼ +32 ppm °C −1 ). The distinct dielectric behavior was subsequently studied by structure-performance relationship in terms of M -site cations and bond parameters using bond valence theory, Phillips–Van Vechten–Levine chemical bond theory and so on. Moreover, a 36 GHz microstrip array antenna was designed and simulated using the LiGaSiO 4 ceramic substrate, obtaining high realized gain, high radiation efficiency and low sidelobe. The result demonstrated the great potential of LiMSiO 4 -type dielectric ceramics in millimeter-wave communications.
研究领域:
材料科学
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电子工程
·
通信技术
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2026
·
IF 6.3
Guangda Guo,Xiao Cheng,Fang Ye,Laifei Cheng
SiC f /SiC composites are attractive for hot-section components in next-generation aircraft engines but suffer rapid degradation in water-oxygen environments. To address this, we propose a matrix modification strategy that introduces yttrium via a gel-assisted precursor infiltration and pyrolysis, combined with reactive melt infiltration. This approach enables precise control of yttrium incorporation and distribution within the matrix, effectively avoiding residual stresses induced by the introduction of water-vapor-resistant elements that could otherwise compromise the mechanical properties and density of the composites. The water-oxygen corrosion behavior of the resulting Y-modified SiC f /SiC composites was investigated at 1350 °C. Yttrium near the surface reacts with H 2 O and O 2 to form dendritic Y 2 Si 2 O 7 , which reinforces the surface oxide layer and mitigates vapor-induced damage. The internal microstructure remains stable, and the composites retain 96.66% of their flexural strength after 50 h of exposure. These results demonstrate that gel-enabled rare-earth modification effectively enhances corrosion resistance, offering a promising pathway for extending the durability of SiC f /SiC composites in harsh aero-engine environments.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Xuewei Ba,Xinyu Han,Wenping Huang,Yuhong Ge,Qiran Wen,Yan Yu,Deqing Zhang,Li Li
Sr 2 (Y, La)NbO 6 :Dy blue-white phosphors were prepared by high-temperature solid-state method. The effects of substitution on the crystal structure, photoluminescence properties, and thermal stability were investigated by XRD, SEM, EDS, XPS, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Phase analysis indicates that the crystal structure of the host materials is not altered by the introduction of Dy 3+ ion, but transfers from monoclinic to cubic system by substituting Y 3+ ions with La 3+ ions. Morphological analysis reveals that the phosphors exhibit irregular shapes with the particle diameters ranging from 10 μm to 20 μm. The blue shift appears in the charge transfer band with the increase of La 3+ ion dosage. Sr 2 (Y, La)NbO 6 :Dy phosphors can be excited by near-ultraviolet and blue light. The emission spectra exhibit two characteristic peaks at 488 nm and 580 nm, corresponding to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 optical transitions of Dy 3+ ions, respectively. The emission intensity and the fluorescence lifetime are enhanced by the replacement of Y 3+ ions with La 3+ ions. The Sr 2 LaNbO 6 :Dy phosphor possesses excellent thermal stability. The luminescent intensity at 423 K retains 83% of the value at room temperature. The result indicates that Sr 2 (Y, La)NbO 6 :Dy phosphors have good prospects in solid state lighting.
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MATERIALS LETTERS
·
2026
·
IF 2.6
Hanlu Zhang,Tianqi Li,Yagang Feng,Shichang Cai,Xuexia Chen
CaZnOS is regarded as an excellent phosphor host with relatively favorable doping sites. However, CaZnOS-based long-persistent luminescence (LPL) materials still encounter challenges such as a narrow emission color range and short persistent luminescence lifetime. In this work, we modulated the emission band and LPL properties of a series of Ca 1-x Sr x ZnOS:0.1%Cu,1%Y phosphors through crystal field engineering by controlling the Sr/Ca ratio. The emission peak of the phosphor series was successfully tuned over 524–681 nm (from blue-green to orange-yellow), accompanied by a remarkable enhancement in both emission intensity and afterglow duration as x increases from 0 to 0.9. Moreover, the anomalous luminescence behavior of the SrZnOS:0.1%Cu,1%Y sample implies the crucial role of the Sr/Ca substitution-induced lattice distortion for tailoring the luminescence properties. Thermoluminescence (TL) spectra reveal that the persistent luminescence properties of these phosphors are closely correlated with their trap depth controlled by the Sr substitution ratio. This work provides an important reference for the composition design and development of high-performance LPL phosphors.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2026
·
IF 4.7
Song Zeng,Jiuming Yu,Wenfu Chen,Chang Jiang,Youxing He,Yiyou Wu,Lei Lu,Linwei Zhang
This study elucidates the chemical mechanism for synthesizing Y-doped tungsten-based precursors using a wet chemical method and investigates its impact on WC-Co cemented carbides. It is found that the acidity (H + concentration) critically determines the precursor phase, morphology, and Y doping efficiency. At moderate acidity, amorphous white tungstic acid nanoparticles rich in W–OH bonds are formed, enabling efficient Y doping (0.34 wt%) through coordination. The resulting Y-doped WC-Co sintered body exhibits a refined microstructure: the average WC grain size decreases from 0.468 μm to 0.388 μm, the WC phase increases from 89.47% to 92.45%, and the brittle Co₃W₃C phase decreases from 9.46% to 6.64%. Y₂₈O₇₂Co₀.₁₅-type precipitates, identified at grain boundaries, contribute to grain refinement via Zener pinning and likely help stabilize the phase composition. This work clarifies the complete pathway from precursor design to microstructure optimization in WC-Co alloys.
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高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Yujie Li,Yixing Wang,Zhenying Liu,Luyao Jiang,Hu Yang,Zhenliang Xu
Molecular separation of dye mixtures containing the same charge remains a challenge. In the present study, we prepared a composite membrane that could efficiently separate anionic dye mixtures. Briefly, Al-Metal-organic framework (Al-MOF) nanoparticles synthesized by the ion-exchange method were used as fillers during the in-situ synthesis of ethanolamine (ETA) grafted polyacrylonitrile (PAN) membrane. The optimized composite membrane showed a high rejection of congo red (CR) from a single solution (96% rejection) and the CR/methyl orange (MO) mixture (93%/18%) solution. The flux of dye mixture solution reached 180 L m −2 h −1 , higher than many reports in the literature. The further modification on pore size (heat treatment) or surface charge (hydrolysis treatment) improved the membrane performance to separate smaller dye mixture of methyl blue (MB)/MO. Both modified membranes showed a good MB rejection (93%) and flux of 70–85 L m −2 h −1 . While for the separation of the MB/MO mixture, the heat-treated membrane showed the lowest flux and a middling rejection. The surface hydrolyzed membrane showed a better selectivity (96% MB/32% MO) and a higher flux (127 L m −2 h −1 ) than that of the entirety hydrolyzed membrane (93% MB/58% MO and flux of 78 L m −2 h −1 ), which was attributed to their different charge distribution.
研究领域:
材料科学
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环境工程
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yuqian Wang,Honghong Lei,Peng Jiang,Lin Liu,Kunyang Cui,Wenbin Cao
Mn-doped Ba 7 Al 2- x Mn x O 10+ y (0 ≤ x ≤ 0.7) samples with intense blue colors are successfully prepared by solid state reactions. With the increase of Mn content, the colors of compounds are tuned from cyan to ocean blue. FT-IR absorption spectrum and 27 Al NMR spectrum indicate that the structure contains a dominating portion of Al–O tetrahedral sites while a small number of Al–O octahedral sites may also exist. The oxidation state of Mn is proved to be +5. Based on all the analysis, the intense blue shades of the samples are proposed as the d-d transition of Mn 5+ ions in [AlO 4 ] tetrahedral sites.
研究领域:
材料科学
·
化学
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NANOTECHNOLOGY
·
2022
·Vol. 33
·期 13
·135503
·
IF 3.953
Shuyang Hu,Qiuyan Shuai,Yulong Lin,Yan Fu,Meng Li
L-3,4-dihydroxy-phenylalanine (L-dopa) is the most widely used drug in Parkinson's disease treatment. However, development of cost-effective and high-throughput sensors to accurate enantioselective discrimination of L-dopa and D-dopa remains challenging to date. Herein, on the basis of the peroxidase-mimic activity of chiral FexCuySe nanoparticles, we demonstrated a novel colorimetric sensor for determination of chiral dopa. The surface chiral ligand, L/D-histidine (L/D-His), endowed the nanozymes with enantioselectivity in catalyzing the oxidation of dopa enantiomers. According to the values of kcat/Km, the efficiency of L-His modified nanoparticles (L-FexCuySe NPs) towards L-dopa was 1.56 times higher than that of D-dopa. While, D-His can facilely reverse the preference of the nanozyme to D-dopa. On the basis of high catalytic activity and enantioselectivity of L-FexCuySe NPs in oxidation of L-dopa, the L-FexCuySe NPs-based system can be utilized for detection of L-dopa. The linear ranges for L-dopa determination were 5 μM–0.125 mM and 0.125 mM–1 mM with a detection limit of 1.02 μM. Critically, the developed sensor has been successfully applied in the quality control of clinical used L-dopa tablets. Our work sheds light on developing simple and sensitive chiral nanomaterials-based sensors for drug analysis.
研究领域:
生物化学
·
医学诊断
·
纳米技术
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Siyu Pan,Jun Yan,Xu Peng,Zhou Xu,Qi Zeng,Zhonghui Wang,Minzhong Zhao,Yi Chen
In the poly(vinyl chloride) (PVC) industry, waste cooking oil (WCO)-derived epoxidized fatty acid methyl esters (EFAMEs) represent a promising bio-alternative to conventional ortho-phthalate plasticizers that are being phased out due to their toxicity and nonrenewable nature. However, to improve the leaching resistance of EFAMEs, the WCO feedstock has to go through multistage distillation at particularly high temperatures under vacuum conditions for saturated component removal, resulting in intensive energy consumption, a significant waste of the feedstock, and a final bioplasticizer with a still faster leaching rate than those of ortho-phthalates. Here, we report a strategy that can Y-shape all components in WCO-derived EFAMEs with another short, polar ester chain via a nucleophilic substitution reaction of the feedstock mixture with dimethyl carbonate. This strategy entails no utilization of an energy-intensive procedure and, importantly, converts all components in the WCO feedstock into the final bioplasticizer. Relative to ordinary EFAMEs, the Y-shaped epoxidized fatty acid methyl diester exhibits a significantly suppressed leaching rate. Under certain scenarios, it even leaches at a rate equivalent to or slower than that of di-(2-ethylhexyl) phthalate (DEHP), the most ubiquitously applied member of the ortho-phthalate family. With this strategy in hand, the renewable WCO may be converted into a high-performance bioplasticizer in an energy-efficient and atom-economic manner to support the phase-out of ortho-phthalates in the PVC industry.
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高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2020
·
IF 2.485
Yi Ding,Zhengdi Jiang,Tianheng Xiong,Zimei Bai,Dandan Zhao,Hui Dan,Tao Duan
Zircon is important ceramic used widely due to its excellent properties, in particular for nuclear waste immobilization . However, it is difficult to obtain mono-phase zircon with high yield, usually result in double-phase ZrO 2 /ZrSiO 4 ceramics. Herein, Ce-doped double-phase 0.2Zr 1- x Ce x O 2 /Zr 1- y Ce y SiO 4 (0 ≤ x + y ≤ 1) ceramics were fabricated and their phase and microstructure evolution were studied. The results demonstrated that Ce content has great influence on the phase composition and microstructure. The ceramics with 0 ≤ x + y < 0.1 are tetragonal-ZrSiO 4 , monoclinic-ZrO 2 and tetragonal-ZrO 2 phases, with 0.1 ≤ x + y ≤ 0.3 are tetragonal-ZrSiO 4 , monoclinic-ZrO 2 , tetragonal-ZrO 2 and cubic-ZrO 2 phases, with 0.3 < x + y ≤ 0.6 are tetragonal-ZrSiO 4 , tetragonal-ZrO 2 and cubic-ZrO 2 phases, and with 0.6 < x + y ≤ 1 are cubic-ZrO 2 and Ce 2 Si 2 O 7 phases. With increasing Ce-doping content, the ZrSiO 4 retained the tetragonal phase, while ZrO 2 transformed from monoclinic to stable cubic phase. Furthermore, lattice parameters , grain size and compactness increased with increasing Ce content.
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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.
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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.
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