JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 6
·e70904
·
IF 4.2
Xinzi Zhong,Quanneng Zhang,Ji Zou,Keyu Gong,Zhipeng Zhang,Jingjing Liu,Huayue Liang,Shuaihang Qiu,Weimin Wang,Zhengyi Fu
Multicomponent oxide ceramics yield great promises in next-generation thermal protection systems according to their high potential for thermal stability and ablation resistance, but their protective mechanisms remain unclear. In this study, the five multicomponent A 6 B 2 O 17 (A = Zr, Hf; B = Nb, Ta) oxide ceramics with different atomic concentrations, respectively, at A- and B-sites, were prepared via a solid-state reaction with a rapid cooling process. Their phase, structural evolutions, and the properties under high-temperature treatment and dynamic ablations were investigated to reveal thermal stability and anti-ablation mechanisms. Only the (Hf 1/2 Zr 1/2 ) 6 (Ta 1/2 Nb 1/2 ) 2 O 17 with equal molar ratio both at A- and B-sites maintained the A 6 B 2 O 17 phase after heat treatment at 1773 K for 25 h; the other samples underwent phase separation behaviors. In addition, the (Hf 3/4 Zr 1/4 ) 6 (Ta 2/3 Nb 1/3 ) 2 O 17 ceramic showed excellent ablation resistance (∼2500 K, 100 s) with the thinnest oxide layer. This property is attributed to the formation of “skeleton-filler phase” protective composite layer, as the (Zr, Hf)O 2 “skeleton” owns high melting point and low volatility to resist thermal gas erosion, and the A n B 2 O 2n+5 family fills defects and hinders the penetrations of O 2 . This study expects to offer design for advanced thermal barriers suitable for the next-generation hypersonic vehicles and reusable spacecraft.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Qiaolin Li,Tiantian Cao,Gang Chen,Hongtao Guan,Chengjun Dong,Zongyou Yin
Reliable detection of volatile organic compounds (VOCs), such as acetone, is essential for environmental monitoring and non-invasive disease diagnosis. However, conventional In 2 O 3 -based gas sensors suffer from high operating temperatures, humidity interference, and limited selectivity. Herein, we report one-dimensional (1D) hollow In 2 O 3 @Fe 2 O 3 core-shell heterojunction tubes fabricated via a tannic acid (TA)-assisted transformation of MIL-68(In). TA plays dual roles in etching the MIL-68(In) template and coordinating with Fe 3 + ions to form a mesoporous tubular structure with an enhanced specific surface area of 89.57 m 2 g −1 for In 2 O 3 @Fe 2 O 3 -0.75. Benefiting from the synergistic n-n heterojunction effect and abundant active sites, the optimized In 2 O 3 @Fe 2 O 3 -0.75 sensor exhibits a markedly improved response of 263.6 towards 100 ppm acetone at 200 °C, approximately 3.6 times that of pristine In 2 O 3 , and enables detection down to 100 ppb with a response of 1.87. Furthermore, the sensor demonstrates rapid response/recovery (8/9 s), excellent long-term stability over 30 days, and remarkable humidity tolerance across 29–82% RH at 25 °C. This work provides an effective MOF-derived strategy for constructing hollow metal-oxide core-shell heterojunctions toward high-performance and humidity-tolerant gas sensing applications.
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RSC Advances
·
2024
·Vol. 14
·期 18
·12954-12965
·
IF 3.9
Thi Viet Ha Luu,Hong Yen Xuan Nguyen,Quoc Thang Nguyen,Quang Bac Nguyen,Thi Ha Chi Nguyen,Ngoc Chuc Pham,Xuan Dung Nguyen,Trung Kien Nguyen,Ngoc Nhiem Dao
This study attempted to improve the photocatalytic activity of zinc oxide (ZnO) semiconductors in the visible light region by introducing the co-doping of carbon (C) and tantalum (Ta) to ZnO (ZTC) using a simple hydrothermal method with the respective precursors. The obtained uniform ZTC nanoparticles with an average crystal size of 29.30 nm (according to Scherrer's equation) revealed a redshift with a decrease in bandgap (Eg) from 3.04 eV to 2.88 eV, allowing the obtained photocatalyst to absorb the energy of the visible light for photocatalysis. Furthermore, the Zn 2p and Ta 4f core level spectra confirmed the presence of Zn2+ and Ta5+ in the ZTC sample. In addition, the infrared spectra identified hydrogen-related defects (HRDs), while the O 1s spectra indicated the existence of oxygen vacancies (VO). Electrochemical tests revealed improvement in the electron conductivity and charge separation of the obtained materials. To follow, the photocatalytic performance assessment was conducted by varying the C/Zn2+ ratios (5, 10, and 15 mol%) in ZTC samples, the initial RhB concentration (7, 15, and 30 ppm), and the pH of the RhB solution (3.0–10.0). The photodegradation on ZTC samples showed the most effectiveness for a 7 ppm RhB solution with a C/Zn2+ ratio of 10 mol% in the slightly alkaline medium (pH 9.0). Additionally, ZTC also exhibited commendable durability after being reused several times. The nature of RhB photodegradation was proposed and discussed via a mechanism at the end of this work.
研究领域:
材料科学
·
环境科学
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiangping Feng,Lei Zhang,Chao Li,Ming Shen,Runguo Zheng,Zhiyuan Wang,Hongyu Sun,Yanguo Liu
Cubic phase Li 7 La 3 Zr 2 O 12 (LLZO) is a promising electrolyte material for all-solid-state rechargeable lithium-ion batteries. The homogeneous densification of the garnet solid electrolyte ceramic material is crucial for enhancing its ionic conductivity performance. Herein, an Al/Ta co-doped strategy is employed to stabilize the cubic phase structure of LLZO and is combined with a two-step sintering method to enhance densification, in order to investigate its effect on microstructure, ionic conductivity, and electrochemical properties . During the formation process, amorphous Li 2 O reacts with doped Al 2 O 3 to create a Li–Al–O liquid phase at the grain boundaries. Combined with two-step sintering to ensure that the desired material transformation is achieved, resulting in a dense microstructure and better mechanical properties. The solid electrolyte Li 6.4 Al 0.1 La 3 Zr 1.7 Ta 0.3 O 12 under two-step sintering (LLZATO-2) is successfully synthesized, delivering an ionic conductivity up to 7.33 × 10 −4 S cm −1 at room temperature and an activation energy of 0.22 eV. This work also highlights the critical role of co-doping combined with two-step sintering in preparing well-performing solid-state electrolytes and all-solid-state lithium-ion batteries.
研究领域:
材料科学
·
电化学
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Advanced Materials Technologies
·
2024
·
IF 6.4
Xiujie Guo,Wenjing Qin,Changshun Gu,Xinxin Li,Mengyao Chen,Hanlin Zhai,Xiangchuan Zhao,Hengchao Liu,Boxin Zhao,Yan Zhang,Yanli Wang,Shougen Yin
Conductive hydrogel is considered a promising wearable sensor material. Developing flexible conductive hydrogel sensors with stretchability, adhesion, and stability remains challenging. In this study, a transparent, self-adhesive, antifreeze, anti-UV, stretchable, conductive, and reusable hydrogel with polyacrylamide/glycerol/gelatin/tannic acid/Fe 3+ (PGGT-Fe 3+ ) structure is successfully constructed through a simple one-pot polymerization method. The PGGT-Fe 3+ hydrogel is composed of dual networks of polyacrylamide and gelatin for organic cross-linking, using water/glycerol as the dispersion medium, and incorporates a viscous substance: tannic acid, and a conductive substance: metal ions (Fe 3+ ). Due to the introduction of the abundant amino, carboxylic acid, and hydroxyl functional groups on gelatin and tannic acid, the PGGT-Fe 3+ hydrogel exhibits excellent and repeatable adhesion capabilities on various surfaces (including glass, metal, plastic, and pigskin) with maximum adhesion strength of 98 kPa when attached to pigskin. Furthermore, based on the stable conductive network and high conductivity, the hydrogel not only exhibits strain sensitivity, fast response, and stability but also can stably collect epidermal bio signals. In conclusion, this work provides a new approach to the design and development of next-generation multifunctional conductive hydrogels and opens up vast possibilities for their applications in the flexible electronics field.
研究领域:
材料科学
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生物医学工程
·
传感器技术
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高影响因子
FOOD HYDROCOLLOIDS
·
2026
·
IF 13.8
Shiqi Yang,Donglei Luan,Yahui Wen,Bin Zhao,Tianxi Yang,Juan Yan
Ready-to-eat cooked meat products contain high levels of moisture and nutrients, making them highly vulnerable to microbial contamination and subsequent quality degradation during storage. Therefore, the development of green packaging materials that integrate active preservation functions with freshness indication is of great significance. In this work, a carboxymethyl chitosan (CMCS)/tannic acid (TA)-Fe 3+ coordination hydrogel (CMCS/TA-Fe) film with favorable biocompatibility and degradability was fabricated through a facile coordination-driven self-assembly strategy, leveraging the multiple interactions among CMCS, TA, and ferric ions (Fe 3+ ). The introduction of the TA-Fe 3+ metal-polyphenol markedly enhanced the mechanical performance of the film, increasing its storage modulus (G′) to approximately 2.4 × 10 4 Pa, and endowed it with efficient photothermal conversion capability. Under near-infrared irradiation at 808 nm, the film surface temperature rapidly increased to 103 °C within 15 min, enabling complete inactivation of Escherichia coli and Staphylococcus aureus . In addition, the dynamic coordination structure of TA-Fe 3+ exhibited pH-responsive chromatic behavior in a model system, resulting in distinct and reversible color changes under different pH conditions. These color variations suggest the potential of the CMCS/TA-Fe film as a visual indicator for freshness-related pH changes. When applied to the refrigerated preservation of cooked chicken breast, the CMCS/TA-Fe film combined with near-infrared irradiation effectively inhibited microbial proliferation, delayed pH increase, reduced moisture loss, and preserved textural and sensory quality. Overall, this study demonstrates a multifunctional and environmentally friendly hydrogel film that integrates photothermal antibacterial activity with a pH-responsive color indication function, offering a promising strategy for intelligent food packaging applications.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yanhua Zhang,Jiadong Deng,Dongwei Hu,Fei Chen,Qiang Shen,Lianmeng Zhang,Shijie Dong
The Li + concentration and Li + transport channel size of garnet-type solid electrolyte Li 7 La 3 Zr 2 O 12 are the two key factors associated with the improvement of Li ionic conductivity . Through precise control of the Li + concentration and the Li + transport channel size by Ta-doping (Li 7-X La 3 Zr 2-X Ta X O 12 , X = 0.2–1.0), synergistic regulation of the two factors is achieved. Results show that the optimum Li + concentration seems to be at about 6.31 where the Li + occupancy in LiO 6 is high and the Li + arrangement in LiO 4 is disordering. With the Li + concentration higher than 6.31, the occupancy in LiO 4 sites remains constant but the Li + arrangement in LiO 4 becomes more and more ordering. At higher Li + concentration of 6.52, Li + arrangement becomes certain of ordering which should have reduced the grain conductivity, however, the grain conductivity is still as high as 9.84 × 10 −4 S cm −1 . This indicates that LLZO with this Li + concentration have favorable Li + transport channel size. The optimum Li + transport channel size is about 12.95 ± 0.01 Å. At Li + concentration of 6.31, the proper Li + concentration is the main factor for the high grain ionic conductivity of 10.1 × 10 −4 S cm −1 . While at Li + concentration of 6.52, the suitable Li + transport channel size is the main factor for the high grain ionic conductivity. In conclusion, the high grain ionic conductivity at Li + concentration of 6.31–6.52 is due to the synergistic regulation of Li + concentration and Li + transport channel size.
研究领域:
材料科学
·
电化学
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高影响因子
MATERIALS LETTERS
·
2026
·
IF 2.6
Fei Sheng,Xiaomei Liu,Yi Liu,Botao Zhang,Hua Li
Titanium alloy implants face persistent risks of bacterial infection and insufficient early osseointegration. In this work, a hierarchical micro/nano-structured hydroxyapatite (HA)-ε-polylysine (PL)-tannic acid (TA) composite coating was fabricated on sandblasted titanium alloy via a controlled drop-casting strategy. Surface roughness increased with deposition cycles and was tuned from 1.91 to 5.01 μm after eight cycles. The HA-PL/TA 8 coating exhibited excellent antibacterial activity (> 99.99%) against both Staphylococcus aureus and Escherichia coli , mainly attributed to the intrinsic antibacterial properties of PL and TA. The coating maintained structural integrity and antibacterial performance after 7-day PBS immersion. Meanwhile, the bioactivity of HA and hierarchical structure promoted MC3T3-E1 osteoblast adhesion and proliferation. This multifunctional coating provides a simple strategy for constructing antibacterial and cytocompatible interfaces on titanium implants.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jiping Zhao,Youlong Xu,Xiangdong Ding
Although tantalum (Ta) has been studied experimentally for many years as an important anti-corrosion material, it remains a challenge to accurately predict its corrosion anisotropy theoretically. In this work, we proposed an ab initio model considering the solvation effect to investigate crystal orientation-dependent corrosion behavior of Ta. The changes in electron transfer number and energy of a tantalum atom during its dissolution from the surface in vacuum and explicit methanol molecules were studied, respectively. Based on the anodic dissolution activation energy considering solvation effect, the corrosion current densities of (200), (110) and (211) surfaces were calculated to be 3.39 × 10 −8 A/cm 2 , 2.24 × 10 −11 A/cm 2 and 2.95 × 10 −11 A/cm 2 , respectively. The results are consistent with the variation trend of peak intensity in the XRD pattern. More importantly, the corrosion current density we predicted based on the percentage of these crystalline surfaces in the polycrystalline tantalum foil is 10 −7.25 A/cm 2 , which is very close to the experimental value (8.70 × 10 −8 A/cm 2 ). Therefore, this result is capable of providing a theoretical basis for the electrochemical machining of Ta and a new idea for studying the anodic dissolution behavior of other metals or alloys in solution.
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Nanomaterials
·
2018
·Vol. 8
·期 12
·983
·
IF 3.504
Shiman He,Yuying Meng,Yangfei Cao,Senchuan Huang,Jingling Yang,Shengfu Tong,Mingmei Wu
TiO2is one of the most attractive semiconductors for use as a photoanode for photoelectrochemical (PEC) water oxidation. However, the large-scale application of TiO2photoanodes is restricted due to a short hole diffusion length and low electron mobility, which can be addressed by metal doping and surface decorating. In this paper we report the successful synthesis of hierarchical Ta doped TiO2nanorod arrays, with nanoparticles on the top (Ta:TiO2), on F-doped tin oxide (FTO) glass by a hydrothermal method, and its application as photoanodes for photoelectrochemical water oxidation. It has been found that the incorporation of Ta5+in the TiO2lattice can decrease the diameter of surface TiO2nanoparticles. Ta:TiO2-140, obtained with a moderate Ta concentration, yields a photocurrent of ∼1.36 mA cm−2at 1.23 V vs. a reversible hydrogen electrode (RHE) under FTO side illumination. The large photocurrent is attributed to the large interface area of the surface TiO2nanoparticles and the good electron conductivity due to Ta doping. Besides, the electron trap-free model illustrates that Ta:TiO2affords higher transport speed and lower electron resistance when under FTO side illumination.Keywords:hierarchical TiO2;Ta doping;charge separation;photoelectrochemical water oxidation
研究领域:
材料科学
·
能源科学
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Zhenxing Wang,Mingcai Han,Jin Zhang,Fang He,Shaoqin Peng,Yuexiang Li
Tannic acid(TA)-aminopropyltriethoxysilane(APTES) coating possesses hierarchical structure and superhydrophilicity, and can be facilely coated on various porous membranes for oil-water separation. However, the TA-APTES coating will lose its superhydrophilicity and underwater superoleophobicity after being exposed to the air for more than one month. Besides, TA-APTES coating on membrane surface decomposes when the coating is immersed in acidic solution (pH ≤ 3) or alkaline solution (pH ≥ 12). In this study, the reasons for the instability of TA-APTES coating have been studied, and an effective strategy for significantly improving the stability of the coating has been developed via simple treatment with ferric ions. The coordination effect between ferric ions and the TA-APTES coating can not only restrain the oxidation of the phenolic hydroxyl groups, but also decrease the electrostatic repulsion and enhance the interactions between the chain segments. The resultant (TA-APTES)-Fe(III) coating possesses long-term superhydrophilicity and excellent acid-base resistance property, while the distinct and hierarchical structure of the TA-APTES coating can be reserved. Thanks to the outstanding stability of (TA-APTES)-Fe(III) coating, the PVDF-(TA-APTES)-Fe(III) membrane can maintain its outstanding anti-oil-fouling property and good oil/water separation performance even it is being exposed in air for one month or being immersed in strong acidic or alkaline solutions for 48 h, which is much better than the pristine PVDF-(TA-APTES) membrane. This study will accelerate the practical application of TA-APTES coating.
研究领域:
材料科学
·
环境工程
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Meng He,Honghong Sun,Haixiang Sun,Xiujie Yang,Peng Li,Q. Jason Niu
Conventional nanofiltration membrane fabrication generally includes the usage of toxic organic solvent that poses threats to the environment and public health. Herein, we explored preparing nanofiltration membrane through a non-organic solvent method utilizing the highly reactive natural product, tannic acid (TA), along with cyclohexane-1,4-diamine (CHD). Fabrication process was carried out through sequential immersion of a polyethersulfone (PES) support in two aqueous monomer phases. The absence of a solvent interface facilitated the diffusion and mixing of the two monomers, and the highly reactive quinone derivative of TA enabled the rapid film formation via Michael addition and Schiff base formation. Membrane performance was optimized through investigation of fabrication parameters. The TA-CHD membrane exhibited a negatively charged surface, with a molecular weight cut-off (MWCO) of 600 Da. The membrane prepared at optimal conditions showed approximate 97% and 50.7% rejections towards Na 2 SO 4 and NaCl, with a water flux at approximate 35 L m −2 h −1 (10 bar). Fouling behaviour of the TA-CHD membrane was studied and a chemical cleaning test under two extreme pH was performed to demonstrate the chemical stability. The proposed non-organic solvent method here provides an eco-friendly way to utilize the potential of polyphenol natural products in water purification membrane preparation.
研究领域:
环境科学
·
材料科学
·
水处理
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高影响因子
危险品化学品经营许可证（带存储）