JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Zelai Cheng,Yulan Jing,Xi Wang,Feng Qiao,Xiuling Yang,Ying Chen,Mingshan Qu,Hua Su
The escalating demand for miniaturized high-frequency circulators in radar and satellite systems necessitates ferrite materials that concurrently possess a high saturation magnetization (4π M s ), a narrow ferromagnetic resonance linewidth ( ΔH ), and a high dielectric constant ( ε r ). In this study, a defect-engineered Bi 1.4 Ca 0.3 Zr 0.3 Y 1.3 Fe 4.6−x In 0.1 O 12−δ garnet ferrite was synthesized, in which synergistic Zr⁴⁺/In³⁺ dual-site doping and controlled Fe-vacancies improved magnetic performance. At optimal Fe-deficiency (x = 0.1), the material achieved a high 4π M s of around 2001 G, enabling C-X band operation. Simultaneously, it attained narrow ferromagnetic resonance linewidth ( ΔH ≈ 112 Oe) through reduced magnetocrystalline anisotropy (| K 1 |) and an enhanced dielectric constant ( ε r ≈ 26.2) via the “rattling” effect that compensated for vacancy-induced polarization loss. A straight-circuit microstrip circulator based on this ferrite ( r 0 = 2.14 mm, r 1 = 7.76 mm) was operated in the bandwidth from 4.23 to 9.85 GHz. It exhibited insertion loss ( S 21 ) better than −0.5 dB and isolation/return loss ( S 11 / S 12 ) below −20 dB. A curved-microstrip redesign further reduced the substrate area to 28.7% of the original while maintaining operation from 4.34 to 9.36 GHz, demonstrating exceptional potential for compact C-X band circulators.
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高影响因子
RARE METALS
·
2025
·
IF 11
Xiaolei Wu,Ren Huang,Yibing Zhang,Peng Lv,Suhua Chen,Ying Bai
en The polyanionic compound Na 3 V 2 (PO 4 ) 3 (NVP) has emerged as a competitive cathode material for sodium-ion batteries (SIBs), owing to its high-voltage redox activity (3.4 V vs. the Na + /Na reference couple) and NASICON-type framework that enables superior ionic conductivity. However, the electrochemical performance of NVP is hampered by low intrinsic electronic conductivity, particularly under ultra-fast charging and long-term cycling conditions. Herein, a hierarchical micro-nano flower-like Na 3 V 2 (PO 4 ) 3 with a carbon-coating layer (HF-NVP@C) is synthesized by a facile n-propanol-assisted precipitation method. Theoretical analysis and experimental tests reveal that the polar-driven hydrogen bond engineering, manifested in the distinct molecular interaction between n-propanol and ultrapure water (characterized by a shorter O-H bond length of 1.859 Å and higher binding energy of −0.312 eV compared to methanol and ethanol counterparts), underpins the formation of the unique hierarchical micro-nano flower-like architecture. This hierarchical architecture creates an expanded interfacial area, enhances ionic transport pathways, and increases electrochemically active sites. Furthermore, a glucose-derived carbon coating (∼2 nm in thickness) uniformly adheres to the NVP surface, effectively enhancing its electronic conductivity. Thus, the constructed HF-NVP@C exhibits superior rate capability (68.1 mAh g −1 at 150C) and long-term cycling stability (58.7% capacity retention after 5000 cycles at 1C). This work proposes a viable strategy for designing high-performance polyanionic cathodes using hydrogen bond engineering. 摘要 zh 聚阴离子化合物Na 3 V 2 (PO 4 ) 3 @C(NVP)因其具有高电压氧化还原活性(相对于Na + /Na参比电对为3.4 V)以及能实现优异离子电导率的NASICON型骨架结构,已成为一种具有竞争力的钠离子电池(SIBs)正极材料。然而,由于NVP的本征电子电导率较低,导致其在超快充电和长期循环条件下的电化学性能较差。在本文中,通过一种简便的正丙醇辅助沉淀法合成了具有碳包覆层的分级微-纳花状Na 3 V 2 (PO 4 ) 3 @C(HF-NVP@C)。理论分析和实验测试表明,极性驱动的氢键工程体现在正丙醇与超纯水之间独特的分子相互作用上(其O-H键长为1.859 Å,比甲醇和乙醇对应的键长更短,结合能更高-0.312 eV),是形成这种独特分级微-纳花状结构的基础。这种分级结构扩大了活性材料的面积,增强其离子传输通道,并增加电化学活性位点。此外,葡萄糖衍生的碳涂层(约2 nm厚)均匀地附着在NVP表面,有效提高其电子电导率。因此,构建的HF-NVP@C展现出优异的倍率性能(150C下为68.1 mAh g -1 )和长期循环稳定性(1C下循环5000次后容量保持率为58.7%)。这项工作证明氢键工程设计高性能聚阴离子正极材料策略的可行,同时也为开发高性能钠离子电池正极材料提供了研究基础。
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-9
·
IF 5.479
Liu Mingwang,Zhou Ji,He Yu,Cai Zhaoxia,Ge Yili,Zhou Jiangang,Song Gongwu
Titanium carbide quantum dots functionalized with ε-poly-L-lysine (PLL) were synthesized by sonication cutting and hydrothermal synthesis. The deprotonated Ti 3 C 2 MXene quantum dots (Ti 3 C 2 MQDs) exhibit excitation wavelength-dependent blue photoluminescence with typical excitation/emission peaks at 330/415 nm and a quantum yield of 22% due to strong quantum confinement. The fluorescence of ε-poly-L-lysine protected Ti 3 C 2 MQDs (PLL-protected Ti 3 C 2 MQDs) is reduced via an inner filter effect after the addition of cytochrome c (cyt-c). Response to cyt-c is linear in the 0.2 to 40 μM concentration range and the detection limit is 20.5 nM. In the presence of trypsin, cyt-c is hydrolyzed to small peptides, and the Fe 3+ ion in cyt-c probably is reduced to Fe 2+ with the aid of the digestive enzyme. This results in the restoration of the blue fluorescence of the modified MQDs. Fluorescence increases linearly in the 0.5 to 80 μg mL −1 trypsin concentration range with the detection limit of 0.1 μg mL −1 . The method was successfully applied to the determination of cyt-c and trypsin in spiked serum samples.
Schematic of a method for the fluorometric “turn-off-on” determination of cytochrome c and trypsin based on ε-poly-L-lysine (PLL) protect MXene quantum dots (Ti 3 C 2 MQDs).
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DOI
PubMed
高影响因子
CANCER GENE THERAPY
·
2022
·Vol. 30
·期 2
·335-344
·
IF 5.854
Liu Jian,Mai Yumiao,Wang Yingjie,Chen Zhiwei,Wang Fei,Wei Huixia,Yao Qianghua
RAB3D, a small Ras-like GTPase involved in regulating secretory pathway, plays a cancer-promoting role in several solid tumors. However, its role in leukemogenesis remains unknown yet. Acute myeloid leukemia (AML) is a common acute leukemia with a high mortality. Here, we found the higher expression of RAB3D in bone marrow mononuclear cells derived from AML patients ( n = 54) versus healthy participants ( n = 20). The following loss- and gain-of-function experiments demonstrated that RAB3D promoted growth, enhanced colony formation and accelerated G1/S transition of U937, THP-1 and KG-1 AML cells. RAB3D silencing inhibited tumorigenesis of AML cells in vivo and delayed AML cells-induced death of mice. Interestingly, the expression of RAB3D is positively correlated with that of an oncogene mouse double minute 2 (MDM2) in bone marrow mononuclear cells of AML patients ( r = 0.923, p < 0.001). Intracellular MDM2 was conjugated with more ubiquitins and degraded faster when RAB3D was silenced. A commonly therapeutic target of AML, β-catenin signaling, was activated by RAB3D overexpression, but deactivated after MDM2 was silenced. The RAB3D-induced proliferation acceleration and β-catenin activation were abolished by MDM2 knockdown, implying that RAB3D function by stabilizing MDM2. In addition, c-MYC, a β-catenin downstream effector, was recruited directly to the RAB3D gene promoter (-360/-349 and -136/-125 sites) and induced its transcription. Collectively, this study demonstrates that RAB3D may exacerbate the malignant behaviors of AML cells through forming a positive feedback loop with MDM2/β-catenin/c-MYC signaling. RAB3D might be a novel target of clinical AML treatment.
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DOI
PubMed
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Jie Wang,Yaqi Wang,Qiwen Jiang,Jian Zhang,Huanhuan Yin,Ziqi Wang,Jiafeng Gao,Zhixia Wu,Jiazhen Liang,Songlin Zuo
Silicon, with its natural abundance and high gravimetric capacity, holds tremendous potential for practical Li-ion batteries (LIBs). However, the major issue related to silicon is its huge volume change during the charge/discharge processes, leading to structural degradation and instability. We report herein reed plants-derived interconnected hollow Si/C hybrids fabricated by using CO2 (carbon source) in traditional magnesiothermic reduction. Both the CO2 amount and HCl concentration for the extraction of SiO2 play a significant role on the architecture design and rational composition of the Si/C hybrids during this new synthetic system. Significantly, the Si/C composites with 21 wt % carbon content as anodes for LIBs display a large reversible specific capacity of 1548 mAh g–1 at 100 mA g–1 and a superior specific capacity of 650 mAh g–1 at 500 mA g–1 for 200 cycles and of 1025 mAh g–1 at 2000 mA g–1. The outstanding rate property and good cycling performance are ascribed to cooperativity of morphologies and structures of the Si/C composites, possessing a large pore volume and specific area, unique interconnected hollow structure, and high electrical conductivity. Additionally, such biomass-derived Si/C hybrid synthetic route with low cost and large-scale production merits probably accelerates the commercialized application of Si-based anodes for LIBs.
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高影响因子
Nano Research
·
2017
·Vol. 11
·期 2
·831-844
·
IF 7.354
Wang Yunhui,Li He,Zhang Yiyong,Peng Yueying,Zhang Peng,Zhao Jinbao
Owing to their unique structural stability and impressive long-term cycling performance, coated hollow structures are highly attractive for energy storage systems, especially batteries. Many efforts have been devoted and various strategies have been proposed to prepare such materials. In the present work, we propose a self-templating thermolysis strategy, different from traditional wet processing methods, to fabricate cuprous sulfide hollow spheres coated with different shells, by exploiting the thermal decomposition properties of the core (CuS) and the protection provided by the shell. To demonstrate the generality of this synthetic approach, three different coating materials (carbon, TiO 2 , MoS 2 ) have been chosen to prepare Cu 2– x S@C, Cu 2– x S@TiO 2 and Cu 2– x S@MoS 2 hollow spheres. All synthesized composite materials were then assembled as electrodes and tested in lithium batteries, showing excellent cycling stability. In particular, the electrochemical properties of Cu 2– x S@C were thoroughly investigated. The results of this work provide an alternative route to prepare coated metal sulfide hollow spheres for energy storage applications.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Jiaoyu Xiao,Hongdong Liu,Jiamu Huang,Yao Lu,Lei Zhang
Transition metal selenides (TMSs) are potential high-power lithium-ion batteries (LIBs) electrode materials because of its considerable theoretical capacity and high electrical conductivity. However, through the electrochemical conversion reaction, the structure of TMSs may be easily destroyed due to its terrible volume effect, which thereby greatly reducing the electrode’s capacitance and cycle life. In this paper, we have synthesized carbon-encapsulated Cu 1.8 Se decahedron nano-composites (Cu 1.8 Se@C) using a metal–organic framework Cu-BTC as template. When applied in anode for LIBs, due to the synergistic effects of tiny copper selenide, integral porous decahedron and exceptional carbon-encapsulated structure, the Cu 1.8 Se@C nano-composites exhibit improved specific capacity, superior rate capability and exceptional cycling stability. The initial discharge specific capacity of Cu 1.8 Se@C-500 °C is 1186.6 mAh g −1 at a current density of 0.1 A g −1 , and after 200 cycles, the specific capacity drops to 824.4 mAh g −1 . What’s more, at a current density of 1 A g −1 , the Cu 1.8 Se@C-500 °C electrode still possesses a considerable specific capacity of 320.3 mAh g −1 after 1000 cycles. In light of our findings, we propose a metal–organic frameworks (MOFs) templates strategy to synthesize in situ carbon-encapsulated TMSs electrode materials with outstanding electrochemical performance for LIBs.
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高影响因子
Evidence-based Complementary and Alternative Medicine
·
2021
·Vol. 2021
·期 1
·9962007
·
IF 2.63
Zhenzhuo Li,Rui Jiang,Jianzeng Liu,Xiaohao Xu,Liwei Sun,Daqing Zhao
Here, we evaluated the in vivo skin-protective effects of topical applications of Panax ginseng C. A. Meyer extract (PG2) and its phenolic acid- (PA-) based components against UVB-induced skin photoaging. PG2 or PA applied to skin of hairless mice after UVB-irradiation alleviated UVB-induced effects observed in untreated skin, such as increased transepidermal water loss (TEWL), increased epidermal thickness, and decreased stratum corneum water content without affecting body weight. Moreover, PG2 and PA treatments countered reduced mRNA-level expression of genes encoding filaggrin (FLG), transglutaminase-1 (TGM1), and hyaluronan synthases (HAS1, HAS2, and HAS3) caused by UVB exposure and reduced UVB-induced collagen fiber degradation by inhibiting the expression of matrix metalloproteinase genes encoding MMP-1, MMP-2, and MMP-9. Meanwhile, topical treatments reduced cyclooxygenase-2 (COX-2) mRNA-level expression in photodamaged skin, leading to the inhibition of interleukin-1 β (IL-1 β ) and interleukin-6 (IL-6) mRNA-level expression. Thus, ginseng phenolic acid-based preparations have potential value as topical treatments to protect skin against UVB-induced photoaging.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2020
·
IF 4.389
Shanshan Yang,Yichao Wu,Chenchen Qu,Jeremy B. Fein,Yizhuang He,Qiaoyun Huang,Peng Cai
Cyclic diguanylate monophosphate (c-di-GMP) is a ubiquitous intracellular secondary messenger which governs the transition from a bacterial cell’s planktonic state to biofilm formation by stimulating the production of a variety of exopolysaccharide material by the bacterial cell. A range of genes involved in c-di-GMP signaling in the Gram-negative species Comamonas testosteroni have been identified previously, yet the physical-chemical properties of the produced extracellular polymeric substances (EPS) and the bacterial adhesion characteristics regulated by c-di-GMP are not well understood. Here, we modulated the in vivo c-di-GMP levels of Comamonas testosteroni WDL7 through diguanylate cyclase (YedQ) and phosphodiesterase (YhjH) gene editing. The strains and their adhesion properties were characterized by Fourier-transform infrared and two-dimensional correlation spectroscopy analysis (FTIR-2D CoS), contact angle and zeta potential measurements, atomic force microscopy (AFM) and extended-Derjaguin-Landau-Verwey-Overbeek (ExDLVO) analysis. Our results show that high c-di-GMP levels promoted the secretion of long-chain hydrophobic and electroneutral extracellular polysaccharides and proteins. The protein molecules on WDL7/pYedQ2 promoted the bacterial self-aggregation and adhesion onto negatively charged surfaces. In contrast, the reduction of intracellular c-di-GMP concentrations resulted in a nearly 80 % decrease in the adhesion of bacterial cells, although little change in the surface hydrophobicity or surface charge properties were observed for these cells relative to the wild type. These results indicate that the reduced adsorption of WDL7/YhjH that we observed may be caused by the flagellum-accelerated mobility at low c-di-GMP concentrations. Taken together, these results improve our mechanistic understanding of the effects of c-di-GMP in controlling bacterial physical-chemical properties and initial biofilm development.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Peiyuan Mao,Yong Wang,Pandeng Xiao,Wen Zhang,Shun Rao,Zhi Wang
Herein, we demonstrate the reasonable design and preparation of yolk-heteroshell Sn@N-doped C@MoS 2 nanospheres as anode materials in sodium-ion battery. Through an effective multi-step strategy, Sn nanoparticles are encapsulated in N-doped C nanocage surrounded by ultra-thin MoS 2 nanosheets to form Sn@N-doped C@MoS 2 nanospheres. In this novel structure, Sn nanoparticles with high theoretical capacity improve the space utilization inside the heteroshell; the N-doped carbon nanocage as the skeleton not only inhibits the mutual accumulation of Sn and MoS 2 , but also improves conductivity; the outer MoS 2 ultra-thin sheets can consolidate C@MoS 2 heteroshell, provide numerous active sites and favor the fast diffusion of Na + /e - . Notably, the combination of carbon nanocage and MoS 2 sheets in the yolk-heteroshell structure can effectually buffer the volume expansion of Sn nanoyolks and reinforce C@MoS 2 heteroshell while reducing the carbon content. Therefore, the yolk-heteroshell structure plays a crucial role in enhanced reversible capacity and cyclic stability of Sn@N-doped C@MoS 2 nanospheres, which activates their sodium storage potential. The yolk-heteroshell Sn@N-doped C@MoS 2 nanospheres exhibit high reversible capacity of 488.4 mAh g −1 at 0.1 A g −1 after 300 cycles and long-cycle stability of 350.6 mAh g −1 at 0.5 A g −1 after 500 cycles. Moreover, their full cell delivers a stable reversible discharge capacity of about 80.1 mAh g −1 after 30 cycles at 0.5 C. This work provides a feasible yolk-heteroshell strategy for Sn-based composite nanomaterials .
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zeyu Liu,Kefan Song,Bingqian Yang,Handan Qiao,Yawei Yu,Yi Wang,Xiulan Hu
The key to direct methanol fuel cells (DMFCs) is the anode catalyst for methanol oxidation reaction (MOR) which has good catalytic activity and stability. Pt@CoO x @N-C catalysts were synthesized by compounding Pt nanoparticles and CoO x with nitrogen-doped porous carbon (N-C). Pt nanoparticles were prepared by solution plasma technique. CoO x @N-C are derived from zeolitic-imidazolate-framework-67 (ZIF-67) by heat treatment at 700 °C. For MOR, Pt@CoO x @N-C exhibits an outstanding electrocatalytic performance (mass activity of 2400 mA mg Pt −1 ) and stability (70% remained after 300 cycles) under acidic condition, which owing to the synergistic effects among the Pt nanoparticles , CoO x and nitrogen-doped porous carbon. Pt@CoO x @N-C shows such mass activity superior to that of Pt/C (460 mA mg Pt −1 ) due to the fact that CoO can adsorb –OH in the solution and then assist Pt to oxidize the CO-like intermediates to CO 2 which improves the resistance to CO poisoning of Pt nanoparticles . Therefore, solution plasma method assisted with metal-organic frameworks have good development prospects on synthesis of highly efficient electrocatalysts .
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高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Jiawei Ge,Tao Guo,Honglie Shen,Fei Zhou,Yufang Li,Ningyi Yuan,Wangyang Yang,Zehui Wang,Yajun Xu,Jinzhe Zhang,Yimin A. Wu
The charge/ion transfer and structural stability of silicon suboxide (SiO X ) for lithium-ion batteries (LIBs) are plaguing. Titanate oxide (TiO 2 ) shows zero strain and high ion diffusion for lithiation , promising for improving its electrochemical properties . Herein, hybrid TiO X /SiO X @C (local reduction of TiO 2 for TiO X ) was prepared via magnesiothermic reaction and self-assembled as hierarchical microspheres . The embedded TiO X and hierarchical structures buffer the volume-expansion-induced strain of TiO X /SiO X @C for high structural integrity. Oxygen-vacancy sites around Ti and Si atoms for charge transfer tunnel and the heterostructure for fast interfacial charge response improve its electronic conductivity . The introduction of locally reduced Ti atoms alters oxygen structural dispersion, further reducing Li diffusion barriers . Even, the inevitable crack of TiO X /SiO X induces its exposure to the electrolyte, facilitating a compact solid electrolyte interphase layer for stable electrochemical performance. Thus, its open-circuit voltage curve displays a low lithiation platform due to its low polarization for Si-based anodes. These synergetic findings deliver the optimal TiO X /SiO X @C with high cycling stability (951.6 mAh g −1 at 1A g −1 after 1000 cycles with a capacity retention of ∼87.7%) and superb rate capability (516.5 mAh g −1 at 4 A g −1 ). This work provides a deep understanding of charge/ion kinetics for SiO X -based anodes of LIBs.
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高影响因子
危险品化学品经营许可证（带存储）