JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 1
·118754
·
IF 6.3
Junyao Wu,Sai Liu,Shenxiang Luo,Jinwei Guo,Haonan Shi,Fan Zhang,Wang Zhu
High-entropy A 6 B 2 O 17 (A = Hf, Zr; B = Ta, Nb)/8YSZ double-layer ceramic coatings with three compositions are fabricated by atmospheric plasma spraying (APS). Thermal cycling tests are performed at 1150 °C with a 5 min heating hold followed by 5 min air cooling, while isothermal oxidation tests are performed at 1150 °C. Among the three coatings, H 3 Z 1 T 2 N 1 coating exhibits the longest thermal cycling lifetime (1823 ± 153 cycles), followed by the H 1 Z 1 T 2 N 1 coating (1123 ± 136 cycles) and H 1 Z 3 T 2 N 1 coating (826 ± 114 cycles). After 180 h oxidation, the thermally grown oxide (TGO) thicknesses are 5 μm, 5.6 μm, and 6.6 μm, respectively. The H 3 Z 1 T 2 N 1 coating possesses the lowest oxidation rate constant ( k p = 0.1263 μm 2 ·h −1 ). This superior performance is attributed to dense vertical cracks induced by higher thermal expansion, which relieve thermal stress, suppress oxygen ingress, and delay interfacial failure.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2021
·Vol. 8
·期 22
·2102207
·
IF 16.806
Sin-Yi Pang,Weng-Fu Io,Jianhua Hao
Supported metallic nanoparticles render highly tunable physical and chemical properties to mixed-dimensionality materials in electrocatalysts. However, some supports are susceptible to being dissolved in acidic solution or are unstable in ambient air. The development of high-performance catalysts has been facing the major hurdles of the sluggish activity in alkaline solution and requesting high energy to stabilize the nanoparticles on their supports, challenging the pH-universality and the applicability of the supported metallic nanoparticles. Here, a one-step strategy is proposed to modulate the growth of Pt quantum dots (QDs) on HF-free MXene under atomic-level by a low-temperature metal–support interaction reaction. By controllable tailoring in the morphology and strain induced by terminations, Pt (111) QDs with a sub-nanoscale size of 1.15 nm are grown as 0D/1D heterostructure to overcome the restrictions of employing reduction gas and high annealing temperature. The catalyst exhibits a low overpotential of 33.3 mV for acidic solution, while 65.1 mV for alkaline solution at a specific current density of 10 mA cm −2 . This study not only paves a scalable pathway to developing cost-efficient catalysts in moderate conditions, but also demonstrates an effective surface modulation strategy for 0D/1D heterostructures.
研究领域:
材料科学
·
电催化
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Liang Xu,Lei Su,Hongjie Wang,Hongfei Gao,Pengfei Guo,Min Niu,Kang Peng,Lei Zhuang,Zhiwei Dai
Materials with ultralow thermal conductivity and good thermal stability are of great interest in numerous applications such as energy storage and conversion devices, and thermal insulation components. In this work, a family of high-entropy Sm 2 B 2 O 7 (B=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) oxides with highly disordered cations on the B-site has been synthesized by introducing large atomic-size mismatch, mass and charge disorder. Through tuning the composition, the high-entropy Sm 2 B 2 O 7 oxides can be engineered from pyrochlore to fluorite structure, accompanied with an order-disorder transition. The pyrochlore Sm 2 (Nb 0.2 Sn 0.2 Ti 0.2 Y 0.2 Zr 0.2 ) 2 O 7 and fluorite Sm 2 (Nb 0.2 Ta 0.2 Y 0.2 Yb 0.2 Zr 0.2 ) 2 O 7 exhibit low thermal conductivities of 1.35 W·m −1 ·K −1 and 1.23 W·m −1 ·K −1 , respectively, indicating their good thermal insulation. In addition, the high-entropy fluorite Sm 2 (Nb 0.2 Ta 0.2 Y 0.2 Yb 0.2 Zr 0.2 ) 2 O 7 also shows average thermal expansion coefficient of 10.2 × 10 −6 °C −1 and high-temperature stability even after thermal exposure at 1600 °C in air for 30 h. These results indicate that the high-entropy Sm 2 B 2 O 7 (B=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) can be promising candidates for thermal barrier coatings and thermally insulators.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 2
·1018-1026
·
IF 3.094
Xuefang Luo,Ziyang Hou,Tianliang Zhou,Rong-Jun Xie
Mn 4+ -activated fluoride red-emitting narrow-band phosphors have been successfully used in wide color-gamut white LEDs for liquid crystal display (LCD) backlights. However, highly concentrated and toxic HF is usually used in their synthesis, causing environment and safety issues. In this work, we proposed a HF-free green method, that is, using NH 4 F/HCl instead of HF, to synthesize a series of A 2 X F 6 :Mn 4+ ( A = K, Na, Rb, Cs; X = Si, Ge, Ti) phosphors. The microstructure, photoluminescence (PL) properties, thermal quenching, and applications of the synthesized phosphors were investigated. Using the proposed approach, the phosphors generally showed a pure phase, a particle size ranging from 5 to 45 μm, and some characteristic sharp emission lines of Mn 4+ in the red spectral range. The internal quantum efficiency was varied in a broad range of 69%-94% under the 460 nm excitation, depending on the composition of the fluoride host. Among these compositions, K 2 X F 6 :Mn 4+ ( X = Ge and Ti) phosphors even had a similar external quantum efficiency (>60%) with commercial ones. By combining K 2 GeF 6 :Mn 4+ (narrow-band red) and β -sialon:Eu 2+ (narrow-band green) with a blue LED, a white light-emitting diode (wLED) backlight with a color gamut of 87.7% National Television System Committee Standard, color temperature of 8423 K, and a luminous efficacy of 110.8 lm/W was demonstrated. These results indicate that the synthetic method proposed in this work is universal for preparing highly efficient fluoride phosphors used in wLEDs.
研究领域:
材料科学
·
光电技术
·
光子学
·
照明技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhizhou Liu,Le Ma,Xueyan Nan,Xiang Zhao,Liang He,Tong Wang,Pengli Bai
Non-specific binding was a critical bottleneck in biosensing field and hindered the implementation of biosensors in bioassays. Thus, various approaches were developed to minimize the non-specific binding of biosensors. However, the rational utilization of non-specific binding will also produce generous returns. Herein, the first universal cell surface barcoding strategy for mass cytometry independent on particular cell surface molecules was developed based on nano-sized UIO-66 typed metal organic framework (MOF). Profiting from the 9 abundant stable isotopes of Zr and Hf, up to 84 mass barcode combinations can be achieved theoretically through the non-specific binding between positively charged UIO-66 and negatively charged cells. Clearly distinguished individual population sets were obtained when the cell samples were barcoded with UIO-66(Zr), UIO-66(Hf), and UIO-66(Zr/Hf) mixture. UIO-66 can also be used for flow cytometry barcoding and imaging after the modification with a fluorescent dye. Furthermore, the UIO-66 barcoding showed high compatibility with metal chelated polymer (MCP) mass tags in single-cell multiplexing and 16-fold higher sensitivity than MCP based barcoding agents. This work opens new opportunities for MOFs in mass cytometry applications and will also prompt people to evaluate the nasty non-specific binding in another perspective.
研究领域:
生物传感
·
分析化学
·
医学检测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ximing Duan,Jiale Zheng,Pengfei He,Shujun Hu,Chuan Sun,Zhenfeng Hu,Fengchun Jiang,Zenghua Liu,Xiubing Liang
Enhancing the ablation resistance of ultra-high temperature ceramics based on the solid-liquid theory has become a research hotspot in the field of thermal protection. In this study, HfC-TaC micron composite powders were prepared using spray granulation, and a solid-solution (Hf, Ta)C coating was deposited on the Ta10W substrate through the dual solid-solution effect of radio frequency inductively coupled plasma spheroidization and supersonic atmospheric plasma spraying. The phase composition, microstructure, ablation resistance, and underlying mechanisms of the coating were investigated. The results indicate that after ablation for 200 s at 2200 °C and 2300 °C, the high melting point solid-phase products, HfO 2 and Hf 6 Ta 2 O 17 , serve as structural skeletons, while the liquid-phase Ta 2 O 5 acts as a filler, collectively protecting the Ta10W substrate from oxidation and ablation.
研究领域:
材料科学
·
陶瓷
·
热防护系统
·
等离子喷涂
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2022
·
IF 6.556
Heng Yan,Xuemei Liu,Fan Zhang,Kaiqiang Ma,Xuepeng Shao,Fengcheng Wu,Jun Han,Wenting Bu,Chuting Yang,Liangbin Li,Sheng Hu
U, Sr, Pb, Nd, and Hf isotope ratios can provide basic and important information of nuclear materials. We established a simple and efficient column chemistry method using nano-NaBiO 3, as both oxidizer and adsorbent, to completely separate Ce from rare earth elements (REEs). This new method exhibited a high decontamination (Ce/Nd < 10 −5 ) ability and was easy to conducted, thereby providing clear advantages compared to traditional liquid–liquid and solid phase micro-extraction techniques. Additionally, a rapid four-column separation procedure, based on Sr, TUR, Ln resins and nano-NaBiO 3 , was developed to isolate U, Sr, Pb, Nd, and Hf in ore samples. The entire procedure could be completed in 4–5 hrs. The robustness of the proposed method was demonstrated by analyzing the 235 U/ 238 U, 87 Sr/ 86 Sr, 206 Pb/ 204 Pb, 207 Pb/ 204 Pb, 208 Pb/ 204 Pb, 142 Nd/ 144 Nd, 143 Nd/ 144 Nd, and 176 Hf/ 177 Hf isotopic ratios of two certified reference materials (CRMs). The analytical results obtained using this method showed good agreement with previously published data. The feasibility of this method was extended to the determination of isotope ratios in uranium ores . The results obtained from the two samples with different regions indicated that they have different isotopic ratios information. These findings indicate the potential for the use of this new method in nuclear forensic science.
研究领域:
化学
·
核科学
·
地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2014
·
IF 3.583
Shengling Sun,Jie Li
A method has been developed for the determination of zirconium (Zr), hafnium (Hf), niobium (Nb), tantalum (Ta), molybdenum (Mo), tungsten (W), and tin (Sn) in seawater by quadrupole inductively coupled plasma-mass spectrometry (Q-ICP-MS). The method is based on separation of the seven elements by extraction chromatography using N-benzoyl-N-phenylhydroxylamine (BPHA) supported on a microporous acrylic ester polymeric resin. The optimized procedure indicates that the BPHA resin has high selective adsorption for Zr, Nb, Mo, Sn, Hf, Ta, and W (known as fluoride soluble elements), whereas other interference and matrix elements are minimally adsorbed. The optimized eluent mixture with their molarity gives satisfactory recoveries for all analytes. The recovery can be achieved 99% for Zr, 97% for Nb, 97% for Mo, 99% for Sn, 99% for Hf, 95% for Ta, and 98% for W, respectively, by eluting with 6 mL of 6 mol L − 1 HF/1 mol L − 1 HCl. Furthermore, the technique for separation and enrichment of these elements provides a low total method blank. The detection limits for this method are 0.5 ppt for Zr, 0.2 ppt for Nb, 1.7 ppt for Mo, 1.0 ppt for Sn, 0.1 ppt for Hf, 0.1 ppt for Ta, and 0.3 ppt for W, respectively. The validity of the method is evaluated by replicate analyses of seawater reference materials; the precision of the results is better than 3% (RSD, n = 4), and the results are in good agreement with certified values. The established procedure has proved to be both practical and effective for seawater sample analyses.
研究领域:
分析化学
·
海洋化学
·
环境地球化学
·
痕量元素检测
·
质谱分析
✓ 已验证
DOI
高影响因子
PHARMACEUTICAL BIOLOGY
·
2022
·
IF 3.889
Shuhua Shen,Kungen Wang,Yihui Zhi,Yue Dong
Context Non-alcoholic fatty liver disease (NAFLD), the most common chronic liver disease, can develop into metabolic associated fatty liver disease (MAFLD). Gypenosides (GP), the main phytochemical component of Gynostemma pentaphylla (Thunb.) Makino (Cucurbitaceae), have been applied for treatment of metabolic diseases.Objective We investigate how GP modulate MAFLD-related hepatic steatosis and intestinal barrier injury.Materials and methods In cell experiments, Caco-2 cells were treated with GP (150 or 200 μmol/L, 24 h), following lipopolysaccharide (LPS) exposure (10 μg/mL, 24 h) to mimic MAFLD in vitro. In in vivo experiments, control, model and model + GP groups were set. High fructose diet/high fat (HFD/HF)-fed (12 weeks) MAFLD rats received GP treatment (300 mg/kg, 6 weeks), followed by intra-peritoneal glucose tolerance test and histopathological examination of rat liver and intestinal mucosa using haematoxylin–eosin staining.Results GP at 200 μM significantly reversed LPS-induced decreases in transepithelial electrical resistance (TER) value (25%), protein expression of occludin (two fold) and ZO-1 (four fold), and the ratio of p-AMPK to AMPK (five fold), while partially repressing LPS-induced leakage of FD4 (50%) and LPS-induced increases in the Toll-like receptor 4 (TLR4) level (50%) and the ratio of p-p65 to p65 (55%). Compared with the model rats, rats with GP treatment presented a reduction in gain of weight and glucose tolerance. In addition, GP alleviated HFD/HF-induced histopathological abnormalities in rat liver and intestinal mucosa.Conclusions GP attenuates hepatic steatosis and intestinal barrier injury in MAFLD rats via the AMPK and TLR4/nuclear factor kappa B (NF-κB) pathways, providing a potential treatment for MAFLD patients.
研究领域:
药理学
·
肝病学
·
营养学
·
细胞生物学
·
病理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2023
·
IF 15
Changjiang Hu,Liwei Cheng,Liheng Zhou,Zhiwen Jiang,Pingping Gan,Shuiyan Cao,Qiuhao Li,Chong Chen,Yunlong Wang,Mehran Mostafavi,Shuao Wang,Jun Ma
High-energy radiation that is compatible with renewable energy sources enables direct H2 production from water for fuels; however, the challenge is to convert it as efficiently as possible, and the existing strategies have limited success. Herein, we report the use of Zr/Hf-based nanoscale UiO-66 metal–organic frameworks as highly effective and stable radiation sensitizers for purified and natural water splitting under γ-ray irradiation. Scavenging and pulse radiolysis experiments with Monte Carlo simulations show that the combination of 3D arrays of ultrasmall metal-oxo clusters and high porosity affords unprecedented effective scattering between secondary electrons and confined water, generating increased precursors of solvated electrons and excited states of water, which are the main species responsible for H2 production enhancement. The use of a small quantity (<80 mmol/L) of UiO-66-Hf-OH can achieve a γ-rays-to-hydrogen conversion efficiency exceeding 10% that significantly outperforms Zr-/Hf-oxide nanoparticles and the existing radiolytic H2 promoters. Our work highlights the feasibility and merit of MOF-assisted radiolytic water splitting and promises a competitive method for creating a green H2 economy.
研究领域:
材料科学
·
化学工程
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yingquan Chen,Rui Li,Yan Zhang,Yanping Long,Na Liu,Haijun Xia,Xiong Luo,Bin Meng
A series of lead-free perovskite-structured high-entropy dielectric ceramics with a composition of (La 0.25 Sr 0.25 Ba 0.25 Na 0.25 )(Ti 0.5 Me 0.5 )O 3 (Me = Sn, Zr, Hf) were designed by doping at both the A and B sites. Specifically, these ceramics were prepared via a solid-state reaction method combined with conventional sintering at 1500 ° C for 10 h. All high-entropy ceramics were consisted of a perovskite-structured single solid solution with an average grain size of 2.78–3.85 μm. Of the three samples, (La 0.25 Sr 0.25 Ba 0.25 Na 0.25 )(Ti 0.5 Sn 0.5 )O 3 exhibited the highest dielectric constant, which remained stable from in 25–312 ° C. All three groups of high-entropy ceramics showed typical relaxor behaviour. The discharge energy density ( W d = 0.31 J/cm 3 ), energy storage efficiency ( η = 90.88%) and breakdown strength ( BDS = 300 kV/cm) of (La 0.25 Sr 0.25 Ba 0.25 Na 0.25 )(Ti 0.5 Sn 0.5 )O 3 were much higher than those of BaTiO 3 ( W d = 0.08 J/cm 3 , η = 46.09%, BDS = 30 kV/cm) and other reported lead-free dielectric ceramics. These results demonstrate that high-entropy (La 0.25 Sr 0.25 Ba 0.25 Na 0.25 )(Ti 0.5 Me 0.5 )O 3 ceramics are promising new candidates for high-performance, lead-free dielectric ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Corrosion Communications
·
2021
·
IF 0
Shuaihang Qiu,Huimin Xiang,Fu-Zhi Dai,Hailong Wang,Yanchun Zhou
The protecting materials of reference electrode with good corrosion resistance to molten salts play vital roles in realizing smelting of refractory and rare earth metals through fused salts electrolysis. BaZrO 3 has been considered as a candidate protecting material of reference electrode for its good chemical stability and high-temperature corrosion resistance. However, the unsatisfactory corrosion resistance to molten salts hinders its practical application. In order to enhance the corrosion resistance to molten salts, three perovskite structured high-entropy oxides HE (Ca,Sr,Ba) TM O 3 including (Ca,Sr,Ba)(Zr,Hf)O 3 , (Ca,Sr,Ba)(Zr,Ta)O 3 and (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 , were designed and prepared in this work. The as-prepared HE (Ca,Sr,Ba)(Zr,Hf)O 3 and (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 ceramics are single-phase, while the as-prepared HE (Ca,Sr,Ba)(Zr,Ta)O 3 ceramic contains 11.6 vol.% of (Ca,Sr,Ba) 2 Ta 2 O 7 . These HE (Ca,Sr,Ba) TM O 3 ceramics possess better corrosion resistance to molten NaCl-KCl salts than BaZrO 3 , among which (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 shows the best corrosion resistance to molten NaCl-KCl salts. The mass loss per unite area of HE (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 after corrosion by molten NaCl-KCl salts at 800 °C for 8 h is mere 2.6×10 −6 g/mm 2 which is ca . 1/60 of that of BaZrO 3 (∼1.7×10 −4 g/mm 2 ), and its surface after corrosion is plain and smooth without any new phase detectable after corrosion. It also exhibits better corrosion resistance to molten NaF-KF salts than BaZrO 3 . The mass loss per unite area after corrosion by molten NaF-KF salts at 800 °C for 8 h is only 2.9×10 −5 g/mm 2 which is smaller than that of BaZrO 3 (3.6×10 −5 g/mm 2 ), the corrosion caused by molten NaF-KF salts only occurs on the surface and the thickness of the corrosion layer is mere ∼8 µm, being less than 1/10 of that of BaZrO 3 (∼100 µm). These results indicate that the three HE (Ca,Sr,Ba) TM O 3 , especially (Ca,Sr,Ba)(Zr,Hf,Ta)O 3 , are promising as protecting materials of reference electrode for the smelting of refractory and rare earth metals through fused salts electrolysis.
研究领域:
材料科学
·
冶金工程
·
电化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）