JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Zewei Liu,Fuhang Huo,Liping Zhang,Yong Liu,Xianglong Li,Lei Zhang,Huarui Zhang,Zixian Pang,Linhua Jiang,Bin Li
A composite material synthesized from HCl-treated red mud and γ-Al 2 O 3 (Al 1 HRM 2 ), was developed to enhance CF 4 decomposition in our previous study. However, its catalytic performance requires improvement, as it suffers from poor stability. In this study, the low-cost and anti-HF-corrosive CaO was utilized to further boost the material's CF 4 decomposition efficiency and stability. Specifically, decomposition efficiency and stability increased by 30% and 2.25 times than that of Al 1 HRM 2 , respectively. At the microscopic level, it was observed that after CaO uniformly distributed across the catalyst surface, it enhanced the Al-O (Al-O-Al) stretching vibration, increased the number of oxygen vacancies, and simultaneously prevented the phase transition from γ to α. Additionally, CaO intensifies the characteristic peaks of strong L-acid sites, enhancing their CF 4 adsorption capacity and strength. Specifically, Al Ⅲ sites facilitate C-F bond cleavage to form AlF 3 , which undergoes fluorine-oxygen exchange with CaO to produce CaF 2 . This process effectively inhibits F + occupation of γ-Al 2 O 3 active sites, thereby promoting CF 4 decomposition. This study utilizes RM as a high-performance material for CF 4 pollution control, achieving the goal of treating waste with waste across the aluminum industry supply chain. It provides a new technological foundation for purifying difficult-to-treat Perfluorocarbons greenhouse gases.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Maoping Lyu,Hebo Shi,Qian Zhang,Yingchun Liu,Hui Zhang
Developing thermally conductive and dielectric polymeric composites is one of the critical drivers in upgrading integrated electronic devices. Herein, polydopamine and silver nanoparticles functionalized Al 2 O 3 ( f -Al 2 O 3 ) with a bionic “ Hoya carnosa flower” structure were prepared, and bifunctional nanocomposites were fabricated by using the f -Al 2 O 3 and soybean oil-based epoxy with a solvent-free method. Morphology and microstructure analyses of the nanocomposites suggested that not only the dispersion of fillers was promoted, but also the fillers/matrix interface compatibility was optimized significantly. In addition to the role as the “bridge” for enhancing thermal conduction and reducing interfacial thermal resistance, silver nanoparticles also inhibit electron migration and suppress the interfacial space charge accumulation. As-prepared nanocomposites thus exhibited a high TC of 0.73 W m −1 K −1 , superior dielectric properties (dielectric constant and dielectric loss are ∼3.9 and 0.03, respectively), and outstanding tensile strength (8.45 ± 0.63 MPa) and elongation at break (∼40 %). Furthermore, interfacial adhesion experiments and theoretical simulation results demonstrated that as-prepared nanocomposites presented great potential in advanced thermal interface packaging. This work offers a versatile approach and provides a new paradigm for the design and fabrication of thermally conductive and dielectric polymer composites derived from vegetable oils.
研究领域:
材料科学
·
纳米复合材料
·
热管理
·
高分子工程
·
电子封装
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Yi Lu,Fengjian Zhu,Chenglong Li,Zhiying Du,Liwei Niu,Hong Chi,Qiang Chang,Dan Xu,Xingwu Liu,Zunqi Liu,Jianbin Chen
Constructing thermally durable single-atom catalysts resembling mononuclear homogeneous catalysts for the hydrosilylation industry is usually challenging. Herein, a stable single-atom catalyst with Pt single atoms anchored on a nonreducible and industrially fundamental γ-Al2O3 support (Pt1/γ-Al2O3) was fabricated using atomic layer deposition technology. The catalyst enabled anti-Markovnikov hydrosilylation under room-temperature and solvent-free conditions and exhibited activity exceeding that of the homogeneous Karstedt’s catalyst. The Pt1/γ-Al2O3 catalyst not only afforded a broad substrate scope in high yields, encompassing various alkenes and alkynes, but also exhibited robust stability and recyclability. Extended X-ray absorption fine structure and X-ray absorption near-edge structure analyses confirmed that the Pt atoms were stabilized by bonding with oxo ligands, forming a PtO4 moiety embedded in γ-Al2O3 lattices with coordination geometries resembling those of mononuclear homogeneous catalysts. Density functional theory calculations revealed that the unexpected catalytic performance could be attributed to the partially positively charged and atomically dispersed Pt atoms in the Pt1/γ-Al2O3 catalyst, which arose from metal–support interaction through oxo ligands, resulting in an elevated d-orbital energy and an upshift in the d-band center away from the Fermi level. This electronic effect facilitated the easier dissociation of phenylethyl and promoted its coupling with the dimethylphenylsilyl group on the catalyst surface, ultimately leading to the desired product.
✓ 已验证
DOI
高影响因子
Journal of Composites Science
·
2025
·Vol. 9
·期 5
·252
·
IF 3.7
Ting Zhang,Xujiang Chao,Junhao Liang,Bin Wang,Mengmeng Sun
This study investigates the mechanical performance of epoxy resin composites reinforced with silane coupling agent-modified Al2O3nanoparticles (m-Nano-Al2O3/epoxy). Three silane coupling agents (KH550, KH560, and KH570) were employed to functionalize the Al2O3nanoparticles, and their chemical structures were confirmed via Fourier transform infrared spectroscopy (FTIR). The microstructure and elemental distribution of the composites were characterized using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Mechanical properties, including tensile strength and hardness, were evaluated using a universal testing machine and a Rockwell hardness tester, respectively. The incorporation of m-Nano-Al2O3significantly enhances the mechanical properties of the epoxy matrix. Compared to pure epoxy, the KH570-modified composites demonstrate a remarkable 49.1% improvement in tensile strength and an 8.8% increase in hardness. These findings highlight the potential of surface-modified Al2O3nanoparticles as effective reinforcements for high-performance epoxy composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2026
·
IF 9.9
Yaofei Lin,Guangheng Wang,Xingxing Meng,Jiahuan Zhao,Hongju Wu,Wenying Zhou
Against the backdrop of the booming sophisticated electronics industry, polymer composites integrating superior dielectric permittivity ( ε ), low loss (tan δ ) and excellent breakdown strength ( E b ) have become a persistent pursuit in the research community. To simultaneously bolster the ε and E b in alumina (Al)/polyvinylidene fluoride (PVDF), in this study the neat Al particles were first surface-oxidized to thicken the alumina (Al 2 O 3 ) thickness and then encapsulated with a titanium dioxide (TiO 2 ) layer, followed by an investigation into the dielectric properties of the resulting Al@Al 2 O 3 @TiO 2 /PVDF composites. The results indicate that the Al@Al 2 O 3 @TiO 2 /PVDF exhibits a higher ε and E b but lower tan δ relative to pristine Al/PVDF. The elevated ε stems from the synergistic regulation of high-frequency fast intra-particle and low-frequency slow inter-particle polarizations in Al@Al 2 O 3 @TiO 2 /PVDF. The Al 2 O 3 @TiO 2 double-shell not only prevents direct contact between conductive Al but also induces deep traps immobilizing charges and lifts the energy barrier for captured charges de-trapping, thus restraining the tan δ and leakage current. Moreover, the double-shell effectively strengthens interfacial interactions and alleviates strong dielectric mismatch between the two components, leading to much reduced electric tree growth and improved E b . Theoretical simulation further reveals a profound understanding of the inherent multiple polarization mechanisms and the charge migration modulation induced by the double-shell structure. So, this work provides unique insights for realizing simultaneously high ε , superior E b and minimal tan δ via core@double-shell structure in percolating composites, which cannot be achieved in traditional composites, offering considerable application potential in power equipment and electric devices.
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 3
·175-187
·
IF 2.4
Meng Rui,Liu Liqin,Guo Weihong
A novel Al 2 O 3 –PDA–MoS 2 nanohybrid was synthesized by depositing Al 2 O 3 nanoparticles on the surface of molybdenum disulfide (MoS 2 ) sheets covered with polydopamine (PDA). Many characterizations demonstrated that the Al 2 O 3 was successfully deposited on the surface of MoS 2 . It was found that when the mass ratio of PDA–MoS 2 to Al 2 O 3 was 1.5:1, the nano-hybrid filler showed good dispersion performance. Then, the composite coating samples were prepared by adding Al 2 O 3 –PDA–MoS 2 (1.5:1) hybrid to waterborne epoxy resin. The effects of Al 2 O 3 , MoS 2 , and PDA–MoS 2 on the corrosion resistance of epoxy coating were also investigated. The potentiodynamic polarization test demonstrated that Al 2 O 3 –PDA–MoS 2 nanohybrids had excellent corrosion inhibition properties. The results of electrochemical impedance spectroscopy also revealed that the impedance modulus of Al 2 O 3 –PDA–MoS 2 /EP composite coating was nearly two orders of magnitude higher than that of pure epoxy resin after immersion in saline for 21 days. This study confirmed that Al 2 O 3 –PDA–MoS 2 nanosheets had better barrier properties and corrosion inhibition properties, and provided a new idea for the wide application of nanofillers in the field of anticorrosion.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 49
·期 3
·4331-4341
·
IF 5.532
Zhou Yi,Shiyu Cui
α-Al 2 O 3 was coated on the powder surface using the precipitation method to improve the pre-oxidation resistance of molybdenum disilicide in thermal barrier coatings (TBCs). The coating effects of four different aluminum sources (Al(NO 3 ) 3 ·9H 2 O) to MoSi 2 mass ratios were evaluated by viscosity and micro-morphology. The shell-forming effects on the powder size and post-treatment were thoroughly analyzed to meet the requirements for practical application in TBCs. The results showed that the precipitation method was superior to the sol-gel process in terms of the shell thickness obtained. Optimal shell-forming was generated at 1200 °C in an inert atmosphere . A bonding layer (Al 6 Si 2 O 13 ) would be formed at the core-shell interface, further preventing oxidation penetration. The self-healing particles MoSi 2 @α-Al 2 O 3 can effectively seal micro-cracks (width below 300 nm) because of the fluidity of SiO 2 at working temperatures.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Yi-Si Feng,Cui Liu,Yu-Mei Kang,Xue-Mei Zhou,Liang-Liang Liu,Jin Deng,Hua-Jian Xu,Yao Fu
Biomass glycerol is an important raw material for many available chemicals, such as 1,2-propanediol (1,2-PDO). Hydrogenolysis of glycerol to 1,2-PDO is considered as a sustainable process with renewable potential application. In this paper, a series of bimetallic PdCu-KF/γ-Al 2 O 3 were prepared and the structures of catalysts were characterized by XRD, XPS, TEM and CO 2 -TPD. By measuring the activity of the catalyst, we found that PdCu-KF/γ-Al 2 O 3 (Pd:Cu:KF = 0.05:1:0.5) can be used as an efficient catalyst for hydrogenolysis of glycerol to 1,2-PDO, with 98.3% selectivity and nearly 100% conversion (200 °C, 2.5 MPa initial H 2 pressure, 20 h).
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
S. Huang,J.P. Tu,X.M. Jian,Y. Lu,S.J. Shi,X.Y. Zhao,T.Q. Wang,X.L. Wang,C.D. Gu
Surface modified-LiV 3 O 8 cathode materials with Al 2 O 3 are successfully synthesized via a facile thermolysis process. The 0.5 wt.% Al 2 O 3 -coated LiV 3 O 8 exhibits an enhanced cyclic stability at various charge–discharge current densities. At a current density of 100 mA g −1 , it delivers an initial specific discharge capacity of 283.1 mAh g −1 between 2.0 and 4.0 V. Moreover, high capacities of 139.4 and 118.5 mAh g −1 are obtained at the 100th cycle at current densities of 2000 and 3000 mA g −1 , respectively. The improved electrochemical performance is attributed to the Al 2 O 3 coating, which can hinder the irreversible phase transformation and act as a protective layer to prevent the active material from direct contact with electrolyte. Furthermore, the formation of a Li–V–Al–O solid solution at the LiV 3 O 8 /Al 2 O 3 interface provides a fast Li + diffusion path which is of benefit to the electrochemical behaviors.
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 14
·期 10
·9695-9703
·
IF 1.5
Weijie Lan,Dongliang Lu,Ruirui Zhao,Hongyu Chen
Al2O3 crucible is commonly used during the sintering process of Li7La3Zr2O12 pellets, which always introduces unintentional Al-containing impurities to the final product. Rare investigations are focused on the mechanism of this crucible contamination up to now. Based on the study in this work, it is found that the extra Li2CO3 in the Li7La3Zr2O12 powder is a crucial factor in forming this kind of Al-containing impurities in the obtained pellets. The pyrolytic Li2O from Li2CO3 will react with Al2O3 at high temperature, forming liquid Li-Al-O eutectic and further promoting the dissolution of aluminum oxide crucible. Besides, the extra Li2CO3 can also affect the compactness and the distribution of Al element in the pellets, resulting in crystal structure transformation.
研究领域:
材料科学
·
固态化学
·
能源材料
·
陶瓷
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 34
·13259-13264
·
IF 8.262
Zhongbin Pan,Lingmin Yao,Jiwei Zhai,Bo Shen,Shaohui Liu,Haitao Wang,Jinhua Liu
Inorganic/polymer nanocomposites, using one-dimensional (1D) core–shell structure BaTiO3@Al2O3 nanofibers (BT@Al2O3 nfs) as fillers and poly(vinylidene fluoride) (PVDF) as the polymer matrix, have been prepared. The core–shell structure BT@Al2O3 nfs have been synthesized via coaxial electrospinning. The breakdown strength (Eb) and discharged energy density of the nanocomposites can be significantly improved by creating an insulating Al2O3 shell layer with moderate dielectric constant on the surfaces of BT nanofibers to form a moderate interfacial area. The Al2O3 shell layer could effectively confine the mobility of charge carriers, which reduces energy loss by reducing the Maxwell–Wagner–Sillars (MWS) interfacial polarization and space charge polarization between the fillers and the polymer matrix. As a result, the nanocomposite films filled with 5 vol% BT@Al2O3 nfs exhibit a excellent discharge energy density of 12.18 J cm−3 at 400 MV m−1, which is ≈254% over bare PVDF (4.8 J cm−3 at 350 MV m−1) and ≈1015% greater than the biaxially oriented polypropylenes (BOPP) (≈1.2 J cm−3 at 640 MV m−1). The work here indicates that this promising state-of-the-art method of preparing high energy density nanocomposites can be used in the next generation of dielectric capacitors.
研究领域:
材料科学
·
纳米复合材料
·
介电材料
·
能量存储
·
聚合物物理
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Chen Zhou,Chenfang Yuan,Yaqiong Zhu,Jürgen Caro,Aisheng Huang
A seeding-free synthesis strategy was developed for the preparation of dense and phase-pure zeolite FAU membranes through mussel-inspired polydopamine (PDA) modification of porous Al 2 O 3 tubes. Zeolite FAU nutrients can be attracted and bound to the support surface via the formation of strong non-covalent and covalent chemical bonds, thus promoting the nucleation and growth of uniform, well-intergrown and phase-pure zeolite FAU membranes. The SEM and XRD characterizations demonstrate that a relative thin but dense and pure-phase zeolite FAU membrane with a thickness of about 2.3 µm can be obtained on the PDA-modified Al 2 O 3 tube after crystallization at 75 °C for 24 h, and no visible cracks, pinholes or other defects are observed on the membrane layer. The zeolite FAU membrane prepared at 75 °C for 24 h was evaluated in single gas permeation and mixed gas separation. For binary mixtures at 50 °C and 1 bar, the mixture separation factors of H 2 /CH 4 and H 2 /C 3 H 8 are 9.9 and 127.7, respectively, which are much higher than the corresponding Knudsen coefficients. And relative high H 2 permeance of about 1.9×10 −7 mol m −2 s −1 Pa −1 can be obtained through the FAU membrane due to the thin layer and the relative wide pore size of 0.74 nm, demonstrating a viable direction for promising application of FAU membranes in hydrogen purification and separation.
研究领域:
材料科学
·
膜技术
·
化学工程
·
分离科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）