CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jinming Huang,Yihua Yue,Xukang Zhang,Ju Zhou,Wenlei Jia,Wenhan Qi,Mingwei Li,Shiqi Li,Jiao Han,Yiming Zeng
This study investigates the synergistic enhancement of tantalum (Ta) doping and nitrogen (N 2 ) annealing on the dielectric properties of Sr 0.985 Lu 0.01 Ti 1-x Ta x O 3 (x = 0, 0.01, 0.015, and 0.02) ceramics. X-ray diffraction (XRD) confirmed the presence of the primary SrTiO 3 phase along with a minor secondary phase of Lu 2 Ti 2 O 7 . XPS, Raman, and UV-vis spectroscopy analyses revealed the formation of defect dipoles including [Ti 3+ - , [ - ], and [Ti 3+ - - Ti 3+ ], induced by Ta doping and N 2 annealing. The combined effects of electron-pinned defect dipole (EPDD, obtained from defect dipoles), along with interface polarization (induced by phase boundaries), resulting in ultra-low dielectric loss and excellent thermal stability. Notably, the Sr 0.985 Lu 0.01 Ti 0.985 Ta 0.015 O 3 ceramic, which was sintered in air and subsequently annealed in N 2 at 1325 o C, exhibited a high permittivity (εᵣ ∼ 162,000), ultra-low dielectric loss (tanδ ∼ 0.013), and excellent thermal stability (-55 o C to 125 o C, Δε′ / ε′ 25 °C ≤ ± 15%) at 1 kHz. This study can provide a way to improve the properties of colossal permittivity materials.
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高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 14
·1888-1895
·
IF 3.474
Chao Cai,Tang Zhu,Dongdong Li,Yun Ran,Haixia Dong,Ning Zhao,Jian Xu
In this paper, tannic acid (TA) was used to assist the fabrication of spherically aggregated Cu2O–TA hybrid sub-microparticles with good chemical stability and controllable sizes. TA exhibited multiple functions in the synthesis: the reductant for the formation of Cu2O crystal seeds, the stabilizer of the primary Cu2O crystals and the protector against the oxidation of Cu2O. A probable mechanism was presumed, including 1) seed formation and TA encapsulation, 2) primary crystal nucleation and growth, and 3) aggregation into spheres. We found that pH played a key role in determining the final morphology of the product while the precursor concentration strongly influenced the size of the particles. At a suitable pH, hierarchically structured Cu2O–TA sub-microspheres with nanocrystals as building blocks were produced. The size of the spheres can be tuned from 130 to 670 nm by adjusting the precursor concentration. Cu2O–TA hybrids exhibited excellent chemical stability against water and oxygen. The method reported here possessed many advantages like cost-effectiveness, facility of preparation, environmental friendliness, chemical stability and excellent adjustability. The properties of the prepared Cu2O particles might facilitate their applications in marine antifouling paints, adsorption materials and antibacterial agents.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Qin Wang,Jiamian Huang,Chenyang Wang,Pengfei Luo,Zhili Li,Rongtao Liu,Qunaying Ma,Jun Luo
NbCoSn-based half-Heusler alloys are promising n-type high-temperature thermoelectric materials, but their relatively high thermal conductivities prevent the further improvement in thermoelectric properties. In this work, an effective way to reduce the lattice thermal conductivity without degradation of electrical transport properties via the isoelectronic substitution of Ta for Nb in NbCoSn-based alloys has been demonstrated. The synthesis and thermoelectric properties of Nb1–xTaxCoSn0.9Sb0.1 (x = 0, 0.05, 0.1, 0.15, 0.2, and 0.25) solid solutions are reported. The large mass fluctuation and chemical bond softening caused by Ta alloying significantly suppress the lattice thermal conductivity. Meanwhile, the Ta content has little effect on the carrier mobility due to the close atomic size and similar chemical nature between Ta and Nb. Benefiting from the significant reduction of lattice thermal conductivity and preservation of electrical transport performance after Ta alloying, a ZT value of ∼0.7 is achieved in Nb0.75Ta0.25CoSn0.9Sb0.1 at 973 K, which is about 32% higher than that of a NbCoSn0.9Sb0.1 matrix. This work demonstrates a valid approach to enhance the thermoelectric performances of half-Heusler alloys.
研究领域:
材料科学
·
热电学
·
固态化学
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高影响因子
International Journal of Chemical Engineering
·
2017
·Vol. 2017
·期 1
·9136528
·
IF 0
Fei Chang,Rui Wang,Quan Zhou,Hu Pan,Heng Zhang
Mesoporous solid acids Ta 3 W 7 and Nb 3 W 7 were prepared from TaCl 5 and NbCl 5 with WCl 6 in the presence of stearic acid (SA) via a sol-gel method, respectively. For comparison, mesoporous Ta 3 W 7 -P123 mixed oxides and mesoporous Nb 3 W 7 -P123 mixed oxides were synthesized in the same way. The catalysts were characterized through TGA, XRD, SEM, TEM, BET, and NH 3 -TPD. Experimental results showed that Ta 3 W 7 -SA and Nb 3 W 7 -SA exhibited several advantages such as higher activity, shorter preparation period, lower cost, stronger acid sites, and higher surface area, which had potential to be used as mesoporous heterogeneous catalysts in biodiesel production.
研究领域:
材料化学
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催化化学
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能源化学
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表面科学
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多相催化
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DOI
COLLOIDS AND SURFACES B-BIOINTERFACES
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2025
·
IF 5.6
Rui Huang,Hangyu Luo,Zhenbang Meng,Weirui Chen,Ri Chen,Qi He,Yuxi Guo,Lihua Zhou,Wenxia Wang,Qiaoshan Chen
The escalating threat of antibiotic-resistant bacterial infections necessitates innovative antimicrobial strategies beyond conventional approaches. Micro/nanomotors, leveraging self-propulsion and intrinsic antibacterial capabilities, offer a promising alternative. However, existing bactericidal micromotors face a fundamental trade-off between motility and bacterial capture capacity. To address this challenge, we synthesized rough-surfaced, virus-like Cu 7 S 4 /vSiO 2 /TA micromotors for localized bacterial capture and synergistic photothermal therapy. This multifunctional platform integrates: i ) Cu 7 S 4 nanoparticles as a high-efficiency NIR photothermal core (λ = 1064 nm), ii ) virus-like silica (vSiO 2 ) shells engineered with nanospike structures to mimic viral morphology, enabling multivalent, affinity-driven bacterial capture, iii ) Tannic acid (TA) coatings providing robust adhesion functionality and enhanced biocompatibility. Attributed to these intriguing properties, the micromotors exploit NIR-II light-fueled self-propulsion to actively seek and accumulate at infection sites. The vSiO 2 /TA surface facilitates targeted bacterial adhesion through synergistic physicochemical interactions, effectively "trapping" pathogens locally. Subsequent NIR irradiation triggers the Cu 7 S 4 core to generate rapid, localized hyperthermia (>50 °C), achieving synergistic bacterial eradication while minimizing off-target damage. We demonstrate the micromotors’ efficacy against diverse bacterial targets (e.g., Gram-positive/Gram-negative strains), highlighting their potential as a targeted, antibiotic-free strategy for treating localized bacterial infections. We believe that this work pioneers the convergence of biomimetic capture (virus-like topology), autonomous motion, and photothermal conversion within a single platform.
研究领域:
纳米医学
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抗菌治疗
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生物医学工程
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光热治疗
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微纳机器人
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DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 35
·2302847
·
IF 29.4
Ju Bai,Wen Gu,Yuanyuan Bai,Yue Li,Lin Yang,Lei Fu,Shengzhao Li,Tie Li,Ting Zhang
Multifunctional selectivity and mechanical properties are always a focus of attention in the field of flexible sensors. In particular, the construction of biomimetic architecture for sensing materials can endow the fabricated sensors with intrinsic response features and extra-derived functions. Here, inspired by the asymmetric structural features of human skin, a novel tannic acid (TA)-modified MXene-polyurethane film with a bionic Janus architecture is proposed, which is prepared by gravity-driven self-assembly for the gradient dispersion of 2D TA@MXene nanosheets into a PU network. This obtained film reveals strong mechanical properties of a superior elongation at a break of 2056.67% and an ultimate tensile strength of 50.78 MPa with self-healing performance. Moreover, the Janus architecture can lead to a selective multifunctional response of flexible sensors to directional bending, pressure, and stretching. Combined with a machine learning module, the sensor is endowed with high recognition rates for force detection (96.1%). Meanwhile, direction identification in rescue operations and human movement monitoring can be realized by this sensor. This work offers essential research value and practical significance for the material structures, mechanical properties, and application platforms of flexible sensors.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 4
·3768-3773
·
IF 1.798
Shen Zhengbo,Wang Xiaohui,Li Longtu
Ta-doped 0.90BaTiO 3 –0.10(Bi 0.5 Na 0.5 )TiO 3 ceramics were successfully prepared by conventional solid-state reaction method and studied to satisfy super-broad temperature stability. The effects of Ta 2 O 5 doping on the dielectric properties and microstructures were thoroughly investigated. Ta plays an important role in the formation of core–shell structure because of chemical inhomogeneity, which gives rise to the weak temperature dependence of dielectric properties. The samples with the additon of 1.5 mol% Ta 2 O 5 satisfy the X9R specification, exhibiting an optimum dielectric behavior of ε
r
~ 2100, tanδ ~ 1.6% at room temperature, which is a promising candidate material for X9R MLCC applications.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2019
·Vol. 34
·期 24
·4045-4055
·
IF 1.982
Bo-Qiong Li,Xin-Cheng Li,Xing Lu
In recent years, there has been a significant thrust toward the development of novel implant alloys based on β-Ti with low Young’s modulus to prevent stress shielding. In this study, porous Ti–Nb–Ta–Zr alloys with porosity of <55% and macro-pore size of 100–400 μm for biomedical applications were successfully fabricated by a space-holder method. The microstructure and compressive behavior were studied. The results show that the micro-pore size of porous Ti–Nb–Ta–Zr alloys decreases with an increase in the amount of the process control agent (PCA), which has no obvious effect on the porosity and the macro-pore size formed by the space holder. Porous Ti–Nb–Ta–Zr alloys fail mainly because of the cleavage and ductile fracture with some dimples in compression. The compressive modulus increases from 0.6 to 6.5 GPa with the increase in the PCA and decrease of the space holder. The influence mechanism has been analyzed by the finite element calculation and the Gibson–Ashby model.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Jin-Bo Cheng,Hai-Bo Zhao,Ai-Ning Zhang,Yan-Qin Wang,Yu-Zhong Wang
Nowadays, a large amount of waste fabrics has brought huge environmental and resource problems, while the traditional recycling routes are downcycling with low efficiency and complex separation processes. Herein, we demonstrate a green and facile route to up-recycle waste fabrics (cotton-polyester blending or cotton fabrics) into a high-performance microwave absorber. In this design, an assistant coating was deposited onto the fiber surface of the waste fabric through the assembly of tannic acid-Fe 2+ (TA-Fe 2+ ), which effectively catalyzed the polymer fiber into highly graphitized porous carbon fiber at high temperatures. Meanwhile, the Fe nanoparticles from the reduction of Fe 2+ ions were evenly embedded on the surface of porous carbon fibers. Consequently, the resultant porous carbon/Fe composites with hierarchical microstructures displayed excellent microwave absorption performances. Typically, the microwave absorber from waste polyester-cotton blended fabric could reach a minimum reflection loss ( RL ) of -50.5 dB at a thin coating thickness of 1.7 mm, and the minimum RL from waste cotton fabric absorber reached -47.1 dB at a thickness of 2.5 mm. This work provides a new idea to convert waste fabrics into high value-added microwave absorbing materials in a simple and environmentally friendly way, which will help reuse resources and protect the environment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Hongyu Xu,Jingjing Zhang,Xue Lv
Due to their biocompatibility and tissue-like properties, hydrogels have garnered considerable interest in bioelectronics field. Nevertheless, their practical implementation is limited by factors such as inadequate mechanical strength, weak interface adhesion, and the lack of antimicrobial properties. To address these challenges, a novel conductive hydrogel was synthesized through free radical polymerization, incorporating laponite (LA), tannic acid (TA), polyacrylic acid (PAA), and polyacrylamide (pAAm). An innovative approach was employed to enhance LA's dispersion through ionic liquid (IL) in water through electrostatic interactions. The integration of TA, PAA, and PAAm with LA sheets via multiple hydrogen bonds resulted in excellent mechanical properties. The resulting P(AAm-AA)/IL-LA/TA hydrogel exhibits impressive characteristics, including a fracture stress of 0.44 MPa, a strain of 1800%. Notably, the hydrogel's TA component exhibits strong antibacterial activity against Staphylococcus aureus and Escherichia coli . This advanced hydrogel sensor effectively monitors human movements, displaying a gauge factor of 12.7. Furthermore, its versatile and conductive nature facilitates adhesion to a wide range of substrates, making it a promising candidate for applications in human activity monitoring, electronic devices, and medical health surveillance.
研究领域:
生物医学工程
·
材料科学
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Shuaijun Yang,Mei Wang,Yetong Lv,Huilin Sheng,Yexia Qin
Oxidation resistance is crucial to the potential applications of high-entropy carbides (HECs) at elevated temperatures. Here, we realize the exploration of (Hf, Ta, Zr, Cr)C high-entropy carbides (HEC-TM, TM = Hf, Zr, Ta, and Cr) with good oxidation resistance by optimizing their compositions. To be specific, 21 kinds of HEC- x TM ( x = 0–25 mol%) samples are fabricated by a high-throughput ultrafast high-temperature sintering technique, followed by oxidation testing at 1673 K for 30 min. Among all the HEC samples, the as-fabricated HEC-0Zr samples are proved to possess the best oxidation resistance with an oxidation depth of only 53 µm. Further study on isothermal oxidation kinetics demonstrates that the as-fabricated HEC-0Zr samples follow a linear oxidation law. The good oxidation resistance of the as-fabricated HEC-0Zr samples is believed to result from the (Ta, Me) 2 O 5 phase with a low melting point, which can promote the densification of the oxide layer. This research opens up a new way for efficiently discovering new HECs for extreme applications.
研究领域:
材料科学
·
高温材料
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DOI
高影响因子
Frontiers in Materials
·
2021
·
IF 3.515
Zhao Fujian,Ji Xiongfa,Yan Yang,Yang Zhen,Chen Xiaofeng,Ma Limin
The repair of bone defects in load-bearing positions still faces great challenges. Tantalum (Ta) has attempted to repair bone defects based on the excellent mechanical properties. However, the osseointegration of Ta needs to be improved due to the lack of osteoinduction. Herein, tantalum–gelatin–methacryloyl–bioactive glass (Ta–GelMA–BG) scaffolds were successfully fabricated by loading BG in 3D-printed Ta scaffolds through a chemical crosslinking method. The results showed that the composite scaffolds have the ability to promote cell adhesion and proliferation. The incorporation of BG resulted in a significant increase in apatite-forming and osteogenesis differentiation abilities. In vivo results indicated that the Ta–GelMA–BG scaffolds significantly enhanced the osteointegration at the early stage after implantation. Overall, the Ta–GelMA–BG scaffolds are a promising platform for the load bearing bone regeneration field.
研究领域:
生物材料
·
组织工程
·
生物医学工程
·
骨科
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DOI
高影响因子
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