JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 2
·1089-1101
·
IF 4.186
Kui Liu,Huaiwu Zhang,Cheng Liu,Liang Shi,Xueying Wang,Jie Li,Yulong Liao,Dainan Zhang
The relationship among the sintering behavior, crystal structure, chemical bonding properties, and dielectric properties of wolframite-type ZnZr(Nb 1− x Ta x ) 2 O 8 (0.0 ≤ x ≤ 1.0) ceramics was investigated with the progressive replacement of Nb 5+ by Ta 5+ . The optimum sintering temperature increases from 1225 to 1375°C with increasing Ta 5+ content. The ε r value falls from 27.34 to 22.34 due to a gradual decrease in bond ionicity and a shift in the Raman vibration modes toward higher wave numbers. The Q × f increases from 63 604 GHz (@6.71 GHz) to 115 631 GHz (@7.89 GHz), which is since the increase in the total lattice of chemical bonds. Moreover, the reduction in grain boundary area and the gradual lowering of the full width at half maximum of the Raman vibration modes contribute to the reduction in dielectric losses. First-principles calculations illustrate that the growth in bandgap and electron cloud density in the internal space of the [Zn/ZrO 6 ] octahedron leads to a reduction in dielectric loss. Furthermore, the reduced degree of oxygen octahedral distortion causes a change in τ f from −46.56 to −37.40 ppm/°C.
研究领域:
材料科学
·
无机化学
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 1
·549-555
·
IF 1.556
Huo Jiansheng,Wang Qianming
A group of LnM
v
O4 (M = Nb, Ta):RE3+ (RE = Eu3+, Tb3+) phosphors have been synthesized by pretreatments with a special reactor (supersonic microwave co-assistance (SMC) machine). Powder characteristics were studied by X-ray
Diffraction, photoluminescence, fluorescence microscope and scanning electronic microscope. Results showed the samples can exhibit green or red emissions upon the ultra-violet excitations. The influence of SMC method on the physical properties has been investigated in detail.
研究领域:
材料科学
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发光材料
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纳米技术
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固态化学
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高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2016
·Vol. 32
·期 8
·2052-2058
·
IF 0.844
JIAN Yuan,MU Wan-Jun,LIU Ning,PENG Shu-Ming
The adsorption of Sr2+ ions onto Ta-doped hex-WO3 nanomaterials was studied by measuring the zeta potentials of the powder nanoparticles and by determining the adsorption isotherm and adsorption mechanism. Five important results were obtained: (1) the zeta potential
values of the Ta-doped hex-WO3 suspensions in different electrolyte solutions, within the studied pH ranges, increased with an increase in electrolyte valence; and (2) the zeta potential of the Ta-doped hex-WO3 suspensions increased with an increase in ionic strength.
(3) Sr2+ ion adsorption increased with a decrease in temperature and ionic strength. (4) The adsorption enthalpy was calculated as 47 kJ·mol-1, and the interaction between the Ta-doped hex-WO3 surface and Sr2+ ions was concluded to be chemical
in nature. (5) The adsorption of Sr2+ ions onto the Ta-doped hex-WO3 was attributed to surface chemical adsorption and ion exchange (in tunnels).
研究领域:
环境化学
·
材料科学
·
吸附技术
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纳米材料
·
放射性废物处理
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DOI
高影响因子
ACS Nano
·
2026
·
IF 16
Xuan Zhao,Ruilong Shao,Yiruo Yu,Zhiwen Hu,Yiting Jiang,Yilan Zhou,Zibiao Zhong,Jinping Zhou
Sepsis is a life-threatening inflammatory syndrome caused by bacterial infections, with limited therapeutic options in critical care. Lipopolysaccharide (LPS) from Gram-negative bacteria triggers sepsis by activating toll-like receptor 4 (TLR4) through myeloid differentiation protein-2 (MD-2) binding. The phosphate groups in LPS serve as key recognition elements for this interaction. This study developed a zirconium/cerium (Zr/Ce) dual-metal nanozyme with phosphatase activity that catalyzes LPS dephosphorylation, disrupting LPS–TLR4 binding to inhibit NF-κB signaling and reduce inflammation. The nanozyme incorporated l-arginine and tannic acid (TA) to enhance the LPS binding capacity, while TA modification improved the antioxidant capability, constructing a multifunctional TA-Zr/Ce nanozyme. Results show that the nanozyme effectively catalyzes LPS dephosphorylation and suppresses inflammatory cytokine release from macrophages. In septic mice, TA-Zr/Ce treatment improved organ function, reduced systemic inflammation, and increased survival rates while promoting anti-inflammatory M2 macrophage polarization. Furthermore, this study constructed a regenerated cellulose microsphere (RCM)-based hemoperfusion system for loading nanozymes and efficiently removing LPS from blood, demonstrating strong clinical translation potential. Therefore, this research provides additional approaches and tools for the clinical management of sepsis.
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DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Tan Hao,Zhou Peng,Gu Yu,Liu Youxing,Chen Wenxing,Guo Hongyu,Lin Fangxu,Luo Heng,Cao Xiaoqing,Zeng Lingyou,Luo Mingchuan,Guo Shaojun
Solar-driven artificial photosynthesis of hydrogen peroxide and high-value chemicals from oxygen and biomass is promising but is hindered by poor light absorption, sluggish kinetics of biomass dehydrogenation, and low oxygen reduction selectivity. Herein, we develop a resorcinol-formaldehyde resin/carbon-supported Ta-N 2 O 2 single-atom catalyst (RF/C-TaSA) that enables broad-spectrum light harvesting (> 932 nm) and selective biomass conversion in a solid-organic-aqueous three-phase system. RF/C-TaSA achieves a high 3.0% quantum yield at 635 nm, with Ta-N 2 O 2 sites stabilizing intermediates and reducing the energy barrier for biomass conversion. We further demonstrate that RF/C-TaSA enables efficient artificial photosynthesis of H 2 O 2 and value-added chemicals from more available thatch, pine needles and wastepaper. Combining catalyst innovation and system engineering, we build a solar-powered RF/C-TaSA-based photocatalytic device for directly producing commercially viable H 2 O 2 at a high concentration of 3 wt% and high-value-added chemical without requiring energy-intensive separation processes for 70-day operation. Furthermore, the produced crude concentrated H 2 O 2 can also be readily converted to solid H 2 O 2 powder (Na 2 CO 3 ∙ 1.5 H 2 O 2 ) for ease of storage and transport with high sterilization activities even after 6 months.
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PubMed
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Kristina Maliutina,Jiajia Huang,Tong Su,Jianglong Yu,Liangdong Fan
This work introduces nanostructured carbon-based composite with enriched CNTs and microstructural defects from pomelo peel biomass precursors through successive chemical pretreatment, heteroatom N, S dual-doping and transition metal oxide loading (Ta 2 O y ) and its application for electrochemical oxygen reduction reaction (ORR) at room temperature. During the microwave pyrolysis process, volatile N, S-containing species from trithiocyanuric acid reactant were trapped and doped into carbonaceous biomass precursor to achieving the rich-defect porous nanotubes and abundant cavity structure. The effect of biomass pretreatment on the textural and structural properties of biochar and formed CNTs were systematically investigated. The impacts of single doping (N) using melamine and dual-doping (N, S) with trithiocyanuric acid on the structural and electrochemical characteristics of biochar were evaluated. An optimized PP-NS-600-Ta-900 electrocatalyst displayed remarkable ORR activity with a half-wave potential of 0.82 V (vs. RHE), a limiting current density of −5.75 mA cm −2 and an electron transfer number of 3.85. The results offer a useful archetypical template to design and construct reliable CNTs enriched biomass-derived biochar for possible electrochemical energy and storage application, illustrating its viability for utilization as ORR electrocatalyst in potential applications, like fuel cells and metal-air batteries.
研究领域:
材料科学
·
环境科学
·
能源化学
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DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Yang Yue,Zhang Zheng,Ma Tianhui,Jia Shaoting,Huang Chao
To achieve high density and high Li-ion conductivity in the garnet LLZO (Li 7 La 3 Zr 2 O 12 ), an effective strategy is to dope it with high-valence elements to stabilize the cubic phase and to lower the sintering temperature. As well known, flash sintering (FS) is characterized by short sintering times and low furnace temperature. Herein, the doping modification of Ta-LLZO by flash sintering at 700 °C for the higher conductivity of LLZO was investigated in the present study. The results indicate that the addition of an appropriate amount of Ta 5+ can enhance the ionic conductivity. The relative density of the sintered cubic Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 is 94.72%, with a corresponding total ion conductivity of 9.8 × 10 –4 S cm −1 , demonstrating good electrical performance. A solid-state lithium metal battery with Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 electrolyte was assembled, and its electrical performance was tested at 50 °C. The results showed that an initial discharge specific capacity of 126.5 mAh g −1 at a 0.1C rate could be reached.
研究领域:
材料科学
·
能源技术
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Engineering
·
2019
·
IF 4.568
Lin Chen,Jing Feng
Ferroelastic AB O 4 type RETaO 4 and RENbO 4 ceramics (where RE stands for rare earth) are being investigated as promising thermal barrier coatings (TBCs), and the mechanical properties of RETaO 4 have been found to be better than those of RENbO 4 . In this work, B -site substitution of tantalum (Ta) is used to optimize the thermal and mechanical properties of EuNbO 4 fabricated through a solid-state reaction (SSR). The crystal structure is clarified by means of X-ray diffraction (XRD) and Raman spectroscopy; and the surface microstructure is surveyed via scanning electronic microscope (SEM). The Young’s modulus and the thermal expansion coefficient (TEC) of EuNbO 4 are effectively increased; with respective maximum values of 169 GPa and 11.2 × 10 −6 K −1 (at 1200 °C). The thermal conductivity is reduced to 1.52 W·K −1 ·m −1 (at 700 °C), and the thermal radiation resistance is improved. The relationship between the phonon thermal diffusivity and temperature was established in order to determine the intrinsic phonon thermal conductivity by eliminating the thermal radiation effects. The results indicate that the thermal and mechanical properties of EuNbO 4 can be effectually optimized via the B -site substitution of Ta, and that this proposed material can be applied as a high-temperature structural ceramic in future.
研究领域:
材料科学
·
固态物理
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Guoxu He,Menghui Wan,Zhihua Wang,Yanbao Zhao,Lei Sun
Due to its minute droplet size and stability, separation of the emulsion is a non-negligible challenge. In this paper, polyvinylidene fluoride (PVDF) nanofibrous membranes were prepared via the electrospinning method. The nanofibrous membranes were subsequently surface-modified by ZnO nanoparticles , tannic acid (TA), and n-dodecyl mercaptan (DT), in order to reduce the nanofiber membranes' surface energy while increasing their surface roughness . Thus, superhydrophobic and antibacterial nanofibrous membranes have been fabricated for oil-water emulsion separation. The as-fabricated nanofibrous membranes have a water contact angle of 156.5°. The product has a porosity of up to 73.3% due to the high porosity of the electrospinning nanofibrous membranes. In addition, the tensile strength of the PVDF@ZnO@TA@DT nanofibrous membrane is up to 69.25 MPa. Due to these properties, oil droplets can pass through the membrane during the oil-water separation, while the water phase is blocked by the membrane. This results in a good selective permeability of the membrane. As a result, the separation efficiency of the PVDF@ZnO@TA@DT nanofibrous membranes reaches more than 99%, and the flow flux is 1008.88 L·m −2 ·h −1 . At the same time, antimicrobial testing demonstrates that the nanofibrous membranes have a bacteriostatic rate of over 98%. Combined with these properties, PVDF@ZnO@TA@DT electrospun nanofibrous membranes have great potential for efficient emulsion separation and deep purification of wastewater.
研究领域:
材料科学
·
环境工程
·
化学工程
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhangyi Huang,Zhengwei Zhu,Mingyu Su,Yang Shi,Mao Deng,Ruichong Chen,Zhijun Wang,Zhi Zhou,Jianqi Qi,Haomin Wang
This study investigated the high-temperature oxidation behaviors of TMC ceramics. The results indicate that the high-temperature oxidation curves of the four TMC ceramics follow a parabolic law, suggesting a diffusion-controlled process. The activation energies for the oxidation of TaC, NbC, TiC, and ZrC ceramics are 105.4, 124.3, 169.3, and 78.7 kJ/mol, respectively, with oxidation rate constants at 1000 °C of 16.84, 40.45, 0.18, and 14.43 mg 2 /cm 4 ·h for each ceramic, respectively. The temperatures at which the ceramics disintegrate into fragments in high-temperature air are 800, 800, >1000, and 600 °C, respectively. The anti-oxidation performance of the four TMC ceramics ranks as follows: TiC > TaC > NbC > ZrC. In comparison to the reported high-entropy carbide ceramics, the TiC ceramic in this study demonstrates superior anti-oxidation performance due to dense TiO 2 layer formation, characterized by significantly low oxidation rates and excellent structural stability.
研究领域:
材料科学
·
化学工程
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高影响因子
Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
Ji Cheng,Zhang Chengcheng,Xu Zeya,Chen Yan,Gan Yanming,Zhou Minghui,Li Lan,Duan Qinying,Huang Tingting,Lin Jinxin
Bacterial infection is a major challenge that could threaten the patient’s life in repairing bone defects with implant materials. Developing functional scaffolds with an intelligent antibacterial function that can be used for bone repair is very important. We constructed a drug delivery (HA@TA-CS/SA) scaffold with curcumin-loaded dendritic mesoporous organic silica nanoparticles (DMON@Cur) via 3D printing for antibacterial bone repair. Inspired by the adhesion mechanism of mussels, the HA@TA-CS/SA scaffold of hydroxyapatite (HA) and chitosan (CS) is bridged by tannic acid (TA), which in turn binds sodium alginate (SA) using electrostatic interactions. The results showed that the HA@TA-CS/SA composite scaffold had better mechanical properties compared with recent literature data, reaching 68.09 MPa. It displayed excellent degradation and mineralization capabilities with strong biocompatibility in vitro. Furthermore, the antibacterial test results indicated that the curcumin-loaded scaffold inhibited S.aureus and E.coli with 99.99% and 96.56% effectiveness, respectively. These findings show that 3D printed curcumin-loaded HA@TA-CS/SA scaffold has considerable promise for bone tissue engineering.
研究领域:
材料科学
·
生物医学工程
·
组织工程
·
抗菌材料
·
骨再生
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DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2024
·
IF 6
Qin Liu,Xia Zhao,Yuan Lin,Zhaohui Su
Vaccines are essential to prevent infectious diseases, but their thermal instability leads to their heavy reliance on cold-chain. Physical encapsulation is the simplest and most effective strategy to increase the thermostability of vaccines. However, traditional mineralized coatings are strictly dependent on the properties of substrate surface and synthesis conditions. Considering the instability and low surface charge density of vaccines, we developed a facile and robust approach for the protection of a single viral vaccine, tobacco mosaic virus (TMV), through tannic (TA) and FeIII metal-polyphenol networks, which significantly improved the thermostability of viral vaccine by strengthening its conformational rigidity. We found that the formed TA-FeIII nanoshell drastically enhanced the thermostability of the viral vaccine at high temperature of 100 °C and long-term storage at 37 °C. Additionally, the TA-FeIII nanoshell did not destroy the viral RNA, had excellent biocompatibility and was easily synthesized on the vaccine surface within seconds. This ease, low cost and substrate-independent approach makes TA-FeIII nanoshell as a potential candidate for vaccine applications.
研究领域:
病毒学
·
纳米技术
·
药学
·
生物医学工程
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危险品化学品经营许可证（带存储）