CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yanghao Zhu,Zifeng Yang,Bin Li,Le Zhao,Shihui Yu
Silver nanowire (Ag NW) networks are promising candidates for next-generation transparent conductive electrodes (TCEs), but their practical applications are restricted by rapid oxidation and sulfidation under ambient conditions. In this work, a simple solution-phase strategy is developed to stabilize Ag NW networks through the spontaneous interfacial growth of an ultrathin Al 2 O 3 nanoshell on the nanowire surface. By introducing trace amounts of Al 3+ ions, a conformal ∼1 nm Al 2 O 3 coating is formed under ambient conditions without the need for vacuum deposition. The Al 2 O 3 @Ag NW networks retain excellent optoelectronic performance, exhibiting a transmittance of 89.5% and a sheet resistance of 13 Ω/sq, while showing markedly improved resistance to chemical corrosion, sulfidation, and ultraviolet-ozone oxidation. The ultrathin oxide layer has little influence on the electrical conductivity and mechanical flexibility of the nanowire network. In addition, transparent heaters based on the Al 2 O 3 @Ag NW electrodes exhibit rapid thermal response and stable electrothermal behavior. This paper provides a simple and scalable surface-engineering strategy for improving the stability of metal nanowire networks for transparent conductive applications.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Xiaofu Li,Tingfeng Xue,Junliang Ma,Zhibo Liu,Zejia Song,Bingyan Zhu,Liwei Pan,Jing Zhang
A bimetallic Mn-Co@γ-Al 2 O 3 catalyst was prepared • The catalyst effectively activates PMS for the mineralization of CIP • The catalyst enhances PMS activation via electronic, structural and active-site synergy • 1 O 2 is synergistically generated by LAS, oxygen vacancies and bimetallic redox cycles Ciprofloxacin (CIP) is recalcitrant to complete degradation by conventional treatment methods, and persulfate-based advanced oxidation processes often suffer low activation efficiency. In this study, a bimetallic Mn-Co@γ-Al 2 O 3 catalyst was developed to activate peroxymonosulfate (PMS) for the efficient mineralization of CIP. Under optimal conditions (1 mmol·L -1 PMS, pH=9), CIP was completely mineralized within 60 min. The catalytic activity of the bimetallic catalyst surpassed that of the single-metal Mn@γ-Al 2 O 3 and Co@γ-Al 2 O 3 , with a synergistic factor ( SF =1.12, >1) confirming a strong Mn-Co synergy. This synergistic effect results from coupled redox cycles, the inhibition of manganese oxide aggregation, and the presence of abundant Lewis acid sites and oxygen vacancies. The PMS system, primarily governed by singlet oxygen ( 1 O 2 ), effectively reduced the biotoxicity of CIP wastewater, increasing the germination rate of fescue seeds from 80% to 92%. A total of 14 degradation intermediates were identified. The excellent mineralization performance is closely associated with the unique CIP degradation pathway driven by 1 O 2 .
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CATALYSIS LETTERS
·
2026
·Vol. 156
·期 10
·275
·
IF 2.5
Hu Zhoulin,Li Jianwei,Zhang Chuanqi,Guo Wenzhi,Dai Bin,Zhang Chuancai
This study prepared and evaluated hollow spherical (B-Al 2 O 3 ) and needle-like (N-Al 2 O 3 ) alumina catalysts in a fixed-bed reactor for the transesterification of dimethyl oxalate (DMO) with ethanol (EtOH) to produce diethyl oxalate (DEO), using commercial alumina (C-Al 2 O 3 ) as a reference. Experimental results indicated that catalytic activity followed the order B-Al 2 O 3 > N-Al 2 O 3 > C-Al 2 O 3 . At 140 °C and a space velocity of 0.2 h –1 , B-Al 2 O 3 achieved a DMO conversion of 100%, with a DEO selectivity of 84.9% and an ethyl methyl oxalate (EMO) selectivity of 15.1%. The superior performance of B‑Al 2 O 3 originated from its largest specific surface area (202.52 m 2 /g), abundant weak acid‑base sites, and high oxygen vacancies that served as Lewis acid sites, providing more accessible active sites and promoting reactant activation. In situ DRIFTS results suggested a possible nucleophilic substitution pathway for the reaction, involving the replacement of CH 3 O − in DMO by C 2 H 5 O− from EtOH to form DEO. Deactivation studies revealed that coke deposition primarily caused catalyst deactivation; however, catalytic activity could be fully restored after regeneration. This study highlighted the morphological advantages of hollow spherical alumina and elucidated its structure–activity relationship, offering a design strategy for developing efficient catalysts for the green synthesis of DEO. Graphical
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shengyuan Chen,Kailei Lu,Xiaolan Zhou,Zehua Zhouchen,Xu Huang,Jianqi Qi,Tiecheng Lu
In this work, a simple, safe, and low-cost two-step route for preparing spherical AlN powders was developed. Specifically, pure AlN spherical powder can be obtained by using water as the solvent, ammonium polyacrylate as the dispersant, carbon powder and alumina powder as the raw materials, spraying and granulating into a spherical precursor, and then sintering at high temperature under a nitrogen atmosphere. The results demonstrate that the average size and the associated distribution of the precursor can be adjusted by regulating the solid or dispersant content of the slurry, which is beneficial for governing the size of the AlN powder. The average particle size of the sintered spherical AlN powders is approximately 33.5 μm, presenting high sphericity (greater than 0.9) and excellent flowability. This approach developed for preparing spherical AlN powder is of great significance for promoting the widespread application of AlN powder in the field of high-performance fillers.
研究领域:
材料科学
·
无机化学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Peibo Li,Guoqiang Luo,Guinan Zhao,Huawu Liu,Yi Sun,Qiang Shen
Al powder is prone to oxidation, which can introduce impurities in powder metallurgy. In this study, Al 2 O 3 nanonetworks were obtained by destroying the oxide layer through Paulse Activated Sintering (PAS). The network and the nano-precipitation enhance the mechanical properties of Al-Cu-O composites. TEM analysis revealed the formation of CuAl 2 and an Al 2 O 3 network at the grain boundaries. The current facilitated the modulation of the intermetallic compound size and the fragmentation of the oxide layer. The current-induced discharge at the particle interfaces generated localized heating. Higher temperature effectively disrupts the oxide layer. The Al 2 O 3 network improved the fracture toughness of the Al-Cu-O composites by passivating crack propagation. Simultaneously, the current reduced the nucleation barrier for precipitation by promoting directional atomic migration. Uniformly dispersed nano-precipitates are conducive to the improvement of strength. This study provides new insights into oxidation-related challenges in Al powder.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Chaokai Xu,Shengdong Tan,Yaxin Tang,Shibo Xi,Bingqing Yao,Austin Wade,Binbin Zhao,Shangchen Lu,Yankun Du,Mingjiao Tian,Chi He,Lu Ma,Xingjie Fu,Jiwei Shi,Jiong Lu,Alexander G.R. Howe,Sheng Dai,Guangfu Luo,Qian He
We investigated the industrially important PtSn/Al 2 O 3 catalysts prepared with uniform particle sizes (∼ 1 nm) and varied compositions using molecular complexes of Pt(II) and Sn(II). Our best catalyst, with a Sn:Pt ratio of around 2, exhibited a high initial propylene productivity of about 1.1 mol C 3 H 6 (g catalyst) −1 h −1 . Elaborate electron microscopy studies revealed significant compositional variations in the catalyst, highlighting the practical challenges in achieving or confirming the theoretically predicted optimum Sn:Pt ratio. It is also found that the catalytic activities correlate well with the Pt dispersion, suggesting the structure-insensitive nature of the dehydrogenation reaction applies to these ultrasmall Pt-Sn nanoparticles . The presence of Pt-rich particles in the catalysts did not produce noticeable degradations in the reaction selectivity, indicating a wide composition range for Pt-Sn nanoparticles to be effective at the 1 nm size range. These findings emphasize the importance of detailed analysis of compositional distributions for understanding and optimizing nanoalloys.
研究领域:
催化化学
·
材料科学
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Long Chen,Sijie Su,Peijing Tian,Jian Yuan,Weihong Zheng
Rare earth elements have attracted significant attention due to their unique electronic structure. By doping rare earth ions into oxides, they can be used as spectral conversion materials in fields such as photovoltaic power generation and biological probes. In this paper, the performance of Eu 3+ doped Al 2 O 3 hollow microspheres by sol-gel method was analyzed by SEM, XRD, IR, TG-DSC, and fluorescence spectrometer. Using aluminum isopropoxide (Al(OC 3 H 7 ) 3 ) as raw material, PMMA with a particle size of 150 nm as the template, PMMA/boehmite particles with core-shell structure can be prepared by sol gel method and template method. After adding Eu 3+ and heat treatment, a transition occurred from γ-AlOOH(85 °C)→γ-Al 2 O 3 (600 °C)→θ-Al 2 O 3 (1000 °C)→α-Al 2 O 3 (1200 °C) as the temperature increased, and EuAlO 3 was generated at 1200 °C. Eu 3+ occupied the sites without inversion centers inside the host lattice, and the alumina was an effective matrix for the fluorescent properties of Eu 3+ . Its excitation was caused by the 7 F 0 → 5 L 6 transition, and its luminescence was controlled by the 5 D 0 → 7 F 2 transition, which can convert ultraviolet light into red and orange light. The fluorescence intensity increases with the increase of Eu 3+ content, and no quenching was observed at a doping concentration of 10mol% Eu 3+ .
研究领域:
材料科学
·
光学
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chao Chang,Yang Liu,Wei-Ming Guo,Ying Long,Xiao-Ming Duan,De-Chang Jia,Hua-Tay Lin
In the present work, SiC ceramic samples with Al 2 O 3 and CeO 2 sintering additives were prepared by spark plasma sintering (SPS). The effects of Al 2 O 3 to CeO 2 molar ratio from 6.25:3.75 to 5:5, 4:6 and 3:7 on sintering behavior, microstructure, Vickers hardness , and fracture toughness of the SiC ceramic samples were investigated and compared. The results showed that, the relative density of SiC ceramic samples increased from 97.8% to 99.2%, and the Vickers hardness increased from 19.72 ± 0.41 GPa to 21.18 ± 0.92 GPa as the CeO 2 molar ratio increased. The increase in CeO 2 molar ratio effectively improved the densification and hardness of SiC ceramics.
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Materials Today Sustainability
·
2023
·
IF 7.8
Tian Zhao,Yalin Zhao,Zhicong Miao,Zhen Geng,Zhengrong Zhou,Tao Wang,Rongjin Huang,Laifeng Li
The non-degradability of epoxy present environmental and economic challenges. This study synthesized a degradable epoxy resin with ester bonds using a novel method. The synthesized resin was mixed with KH560-modified micro-sized spherical α-Al 2 O 3 particles at different concentrations to produce the A-TPHE. The cured A-TPHE exhibited excellent mechanical properties , including high tensile and shear strength (∼100 MPa), as well as outstanding impact resistance. Furthermore, DMA , DSC , and TGA analyses revealed that the composites had a high glass transition temperature (>100 °C) and good thermal stability . Notably, the A-TPHE 80 % filler achieved a favorable thermal conductivity of 1.2 W/mK at 77 K. A-TPHE also demonstrated good insulation properties . The degradation of the resins was assessed at 30 wt% NaOH, and the recovered filtrate facilitated closed-loop recycling of the composite material with a consistent recovery rate exceeding 70 %. In conclusion, this study establishes a foundation for the application of degradable thermosetting materials in cryogenic environments.
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Catalysts
·
2023
·Vol. 13
·期 5
·807
·
IF 3.9
Zhiping Zhao,Zhixia Wang,Yanbing Tong,Jinru Sun,Ming Ke,Weiyu Song
The search for inexpensive, environmentally friendly, and highly effective catalysts to activate C-H bonds in propane dehydrogenation (PDH) reactions is still a major challenge. Co-based catalysts have gained significant attention in recent years due to their excellent ability to activate C-H bonds and their high selectivity towards olefins, despite being a non-noble and environmentally unfriendly metal. However, further improvements are necessary for practical utilization, particularly in terms of activity and anti-carbon deposition capacity. In this study, we synthesized Al2O3nanorods with abundant pentacoordinated Al3+(Al3+penta) sites. The supported Co on the Al2O3nanorod (Co/Al2O3-NR) exhibited higher selectivity (>96% propylene selectivity) and stability (deactivation rate 0.15 h−1) compared to Co supported on an Al2O3nanosheet with fewer pentacoordinated Al3+sites. Various characterizations confirmed that Co(II) mainly exists as CoAl2O4rather than Co3O4in the form of Co/Al2O3-NR, which inhibits the reduction of Co(II) to Co0and accordingly improves catalyst stability.Keywords:propane dehydrogenation;metal oxide;alumina;spinel
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Xiang Li,Taijun He,Qian Yin,Yitian Qin,Siyuan Sun,Jie Yang,Peng Wang,Kun Fan,Xiangyang Liu
Polyimide (PI) films with excellent corona-resistant performance are vital in multitudinous electrical equipment. Here we employ a largely unexplored strategy to effectively restrain phase separation behavior of siloxane modified PI through chain extension copolymerization (PI-e-Si), thereby generating dense SiO 2 -like storage space under corona that shows powerful ability of encircling and restraining electron/ion, which restricts their direct and persistent attack for PI segment. Therefore, PI-e-Si film owns obviously longer corona-resistant lifetime (30.8 min) than that of pristine PI film (6.4 min) based on accelerated corona-aged test. Furthermore, fluorinated Al 2 O 3 (F-Al 2 O 3 ) with strong corona-resistant ability is applied to construct a solid barrier for dense SiO 2 -like storage space, which synergistically strengthens restraint effect for electron/ion, and it also optimizes heat-conducting and dielectric properties of PI film. Finally, fabricated composite film (PI-e-Si/F-Al 2 O 3 ) further improves corona-resistant lifetime up to 66.8 min, superior to that of Kapton 100 CR film (a famous corona-resistant PI film).
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 28
·72354-72367
·
IF 5.8
Zhou Tao,Lu Linghong,Tao Suwan,Ma Yi
In this work, we synthesized activated alumina biochar composites (γ-Al 2 O 3 /BC) by sol–gel method, which improved the problem that the surface charge of γ-Al 2 O 3 was not conducive to the removal of heavy metal cation in a neutral solution, and then explored the feasibility of removing Pb(II) by γ-Al 2 O 3 /BC as well as reusing Pb-laden waste sludge to remove phosphorus (P) and its micro-adsorption mechanisms. The results show that the maximum adsorption capacity of γ-Al 2 O 3 /BC for Pb(II) is 182.48 mg/g, and the removing capacity of recycled Pb-laden slag for P also reaches 87.13 mg/g. It was found that the presence of Pb in the slag makes P removal more effective. In addition, in the process of P removal, the Pb in the slag will not be released, which will not cause secondary pollution to the water. The micro-adsorption mechanism of Pb(II) and P on the composites was investigated by XPS, XRD, and FTIR. It demonstrates that special functional groups such as hydroxy-aluminum, hydroxyl, and carboxyl groups can remove Pb(II) through strong surface complexation and electrostatic attraction. Furthermore, the removal mechanism of P from Pb-laden sludge includes chemisorption and complexation, and the precipitation of P and Pb on the adsorbent surface is the main reason for the removal of P. Therefore, it is feasible to further effectively remove P by using the waste biochar containing Pb. The idea of this paper provides a potential method for the reuse of waste adsorbent.
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