CERAMICS INTERNATIONAL
·
2026
·
IF 6
Mengwen Zhang,Fanyu Meng,Xiaoyu Chen,Na Cao,Lei Fan,Shoulei Yang
High-performance ceramic cutting tools require superior hardness and toughness under extreme temperatures; yet conventional sintering methods for Al 2 O 3 -Ti(C,N) composites often suffer from incomplete densification and grain coarsening. In this study, dynamic sinter forging (DSF) with oscillatory pressure amplitudes of 40 ± 40 MPa at 1600 °C is employed to regulate the densification behaviour and microstructural evolution of Al 2 O 3 -Ti(C,N) composites. The composite achieves a relative density above 99.9%, flexural strength of 1111 MPa, and hardness of 24.5 GPa at 15 Hz. A maximum fracture toughness of 5.44 MPa m 1/2 is obtained at 10 Hz. Microstructural observations reveal that moderate-frequency oscillation activate interfacial diffusion and stress-assisted plastic flow, promoting grain-boundary sliding and compact bonding to form a fine-grained and homogeneous structure. These results confirm that frequency-controlled DSF facilitates simultaneous enhancement of strength and toughness, providing a valid route for fabricating high-performance Al 2 O 3 -based cutting ceramics with optimized microstructural designs.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 3
·118934
·
IF 6.3
Kai Ge,Xihai Jin,Zhenzhong Xing,Huiying Ouyang,Subo Zhang,Xiao You,Yusheng Ding,Shaoming Dong
This work explores SiC morphology regulation for structure-function integration in porous oxide/oxide ceramic matrix composites (CMCs). Alumina-mullite fiber reinforced Al 2 O 3 -based composites containing SiC particles were heat-treated at 1150 °C and modified by subsequent chemical vapor infiltration (CVI) at 1100 °C to introduce SiC nanowires (SiCnws) or spheroidal SiC deposits. The composite with a moderate nanowire content combined a flexural strength of 208.9 ± 6.3 MPa with the widest effective absorption bandwidth (EAB) of 6.19 GHz at 2.0 mm, while retaining non-brittle fracture behavior. The increased flexural strength is associated with SiCnw reinforcement and further matrix consolidation during CVI, and the wide EAB is attributed to a favorable balance between dielectric attenuation and impedance matching. Further SiCnw growth yielded a minimum reflection loss of −55.9 dB at 1.6 mm but was accompanied by lower flexural strength and a narrower EAB. By comparison, the particulate reference exhibited insufficient attenuation, whereas the composite containing compact aggregates of spheroidal deposits showed stronger attenuation but poorer impedance matching, limiting its bandwidth. Tailoring SiC morphology and content therefore offers a route to integrating broadband electromagnetic wave absorption with load-bearing performance in porous CMCs.
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高影响因子
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
·
2026
·
IF 6.2
Song-Song Wu,Shi-Wei Liu,Pei Huang,Zhe-Ling Li,Yuan-Qing Li,Shao-Yun Fu
A flexible graphene-based composite with both high in-plane and out-of-plane thermal conductivities has been proposed. • The in-plane and out-of-plane FOM of the composites far exceeds that of prior ones with the same graphene content. • The underlying mechanism responsible for the enhanced thermal conductivity of the composite films has been elucidated. Thermal management films are required to have high thermal conductivity in both in-plane and out-of-plane directions. Graphene has an exceptional in-plane thermal conductivity; however, developing graphene-based composite films with high thermal conductivity in both in-plane and out-of-plane directions remains challenging. In this work, flexible graphene-based composite films with high in-plane and out-of-plane thermal conductivities were fabricated by simply intercalating Al 2 O 3 particles into a graphene nanoplatelet (GNP)/polyvinyl alcohol (PVA) system. The reorientation of GNPs induced by 5 μm Al₂O₃ particles results in a composite film with an optimal composition, which exhibits a peak out-of-plane thermal conductivity of 2.85 W/(m·K) while maintaining a robust in-plane value of 13.11 W/(m·K), surpassing previously reported counterparts with similar GNP loadings. The excellent thermal performance was further verified through heat dissipation experiments using a smartphone and a direct current motor. Owing to its simplicity and cost-effectiveness, this study offers a promising strategy for fabricating high-performance thermally conductive graphene-based composites suitable for electronic devices, wearable electronics, and other related applications. Download: Download high-res image (193KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhichao Sun,Songyin Yu,Yuhang Gong,Changhai Liang,Chuang Li
Different from the dehydration of ethanol, the catalytic dehydration of long-chain fatty alcohols to linear α-olefins with the low selectivity arises from a complex reaction network, particularly the secondary isomerization to internal olefins. This study aimed to elucidate the fundamental mechanisms governing selectivity in the catalytic dehydration of n-octanol to 1-octene over conventional γ-Al 2 O 3 catalysts. The combination of kinetic analysis, in situ infrared spectroscopy, and density functional theory (DFT) calculations, we demonstrated that the reaction primarily proceeded via a dioctyl ether intermediate, which rapidly decomposed into olefin and alcohol. In contrast, the isomerization of 1-octene followed a water-assisted re-adsorption and hydration pathway: 1-octene re-adsorbed onto surface acid sites, hydrated to form 2-octanol, and subsequently underwent secondary dehydration, preferentially yielding internal olefins in accordance with Saytzeff's rule. Based on these mechanistic insights, an integrated reaction-separation process was designed using Aspen Plus simulation. Employing a dual-column distillation scheme with heat integration, the process achieved a 1-octene product purity exceeding 98% with ~5.9% lower overall energy consumption. This work provided systematic insights and a feasible strategy, that bridges molecular-scale mechanisms with process engineering, facilitating the highly selective production of α-olefins from biomass-derived long-chain alcohols.
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高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Zhiqian Lin,Huaiqing An,Liyuan Qian,Yun Wang,Haibin Lin,Xiaofei Wang,Guojun Zou,Jinlong Zhu,Songbai Han
Propane dehydrogenation (PDH) is a key process for propylene production, but conventional catalysts are often constrained by high cost, environmental impact, and limited stability under harsh reaction conditions. Fe-based catalysts offer a cost-effective and sustainable alternative due to their intrinsic ability to activate C–H bonds in alkanes. However, precise control over the oxidation state and coordination environment of Fe species to balance PDH activity and stability remains challenging. Herein, we develop a molten-salt-assisted synthesis strategy integrated with CeO2–x-mediated interfacial engineering to finely tune the structural and electronic properties of Fe species supported on Al2O3. The molten salt medium enables uniform dispersion and controlled crystallization of Fe3O4, effectively mitigating its over-reduction during high-temperature H2 treatment. The subsequent incorporation of CeO2–x modulates the local electronic structure of Fe3O4, inducing a controlled partial reduction to metallic Fe0 and forming a well-defined Fe0–Fe3O4 dual-interface architecture. This interfacial electronic reconstruction enriches the electron density of low-valent Fe sites, facilitating efficient charge transfer during propane activation and promoting rapid propylene desorption. As a result, the optimized catalyst demonstrates accelerated PDH kinetics, high propylene selectivity, and enhanced resistance to coking. This work establishes a scalable route for constructing dual-interface active sites, providing a general design principle for low-cost, high-performance PDH catalysts.
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Wei Deng,Mingxiu Jiang,Lingxin Meng,Jiawei Feng,Jiashuo Zhang
Polymer dielectrics play an indispensable role in electrostatic energy storage due to their merits of high voltage resistance, lightweight, excellent flexibility, and easy processability. However, the deterioration in dielectric reliability and energy loss at high temperatures limit their versatility for broader applications. Herein, Ni@Al2O3 NFs are fabricated by encapsulating different content of nickel (Ni) nanoparticles into alumina nanofibers (Al2O3 NFs) via the electrospinning technique and employed to simultaneously improve the dielectric constant and breakdown strength of poly(ether imide) (PEI). This is realized by the coupling action of the increased interfacial polarization, Coulomb blockade effect of Ni nanoparticles, and wide bandgap of Al2O3 NFs. Notably, the PEI nanocomposite films containing 0.50 vol % Ni@Al2O3 NFs exhibit an excellent discharge energy density (Ud) of 5.8 J/cm3 at 150 °C, 262% higher than that of pristine PEI (Ud = 1.6 J/cm3), accompanied by a high efficiency of 81.3%. This work provides a promising strategy to improve the high-temperature energy storage performance of polymer-based dielectrics by exerting the synergistic effect of fillers at ultralow content.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Sai Chen,Shuangjie Chu,Bo Mao
Understanding reaction-driven ceramic formation in metallic melts is essential for designing ceramic-reinforced metal matrix composites with stable interfaces and reliable mechanical performance. In this study, in-situ Al 2 O 3 -reinforced iron-based metal matrix composites (IMMCs) were fabricated via reactive casting in an Fe-Al-CuO system. The effects of precursor composition and melting temperature on Al 2 O 3 formation, microstructure evolution, and mechanical properties were systematically investigated. The results show that melting temperature regulates a nucleation-growth competition mechanism governing Al 2 O 3 evolution. At 1550 °C, the reaction proceeds in a nucleation-dominated regime, producing fine and uniformly distributed Al 2 O 3 particles, whereas increasing the temperature to 1600 °C promotes particle coarsening and interconnection. Transmission electron microscopy analysis demonstrates the formation of a reaction-induced graded Al 2 O 3 /matrix interface with strong metallurgical bonding. The optimally processed composite ( IMMC 1550 °C 60 % ) exhibits an average Al 2 O 3 particle diameter of approximately 1.97 μm, with an area fraction of approximately 17.68%. It also achieves a Young's modulus of 203 GPa, an ultimate tensile strength of 672 MPa, and an elongation of 6.2%, corresponding to increases of 31% and 36% in stiffness and strength, respectively, compared with the unreinforced material. Thermodynamic calculations combined with ab initio molecular dynamics simulations confirm that the oxygen released from CuO preferentially bonds with Al in the Fe-Al-CuO melt, providing atomic-scale mechanistic evidence for in-situ Al 2 O 3 formation.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Siyi Li,Pinyi Wang,Jianyun Hu,Guangcan Yang,Youjun Lu,Zhenxia Yuan,Xiao Zhang,Sen Liang
γ-AlOOH nanopowder synthesized using hydrothermal-assisted freeze-drying was employed as a precursor, with AlF₃ as a sintering aid, to explore the preparation of α-Al₂O₃ with a high specific surface area at elevated temperatures. The γ-AlOOH nanopowder produced in this study exhibited superior dispersion, achieving a specific surface area of 198.06 m 2 /g and a zeta potential of 45.8 mV. At a calcination temperature of 1200 °C, the resulting α-Al₂O₃, synthesized from γ-AlOOH and AlF₃, maintained a specific surface area of 27.72 m 2 /g, significantly higher than the typical values reported in the literature (generally below 10 m 2 /g). The α-phase purity exceeded 99 %, and the [AlO₆] proportion was 95.07 %. Furthermore, at a calcination temperature of 1150 °C, the specific surface area of the α-Al₂O₃ reached 50.48 m 2 /g. Using this α-Al₂O₃ as a carrier, a composite TiO₂ catalyst was prepared via a sol-gel and hydrothermal method. This catalyst demonstrated a photocatalytic degradation rate of over 98 % for rhodamine B (10 mg/L) within 30 min of irradiation, under the illumination of a 300 W mercury lamp in proximity to the light source.
研究领域:
材料科学
·
环境科学
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高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Qinghua Yang,Benxue Jiang,Shuilin Chen,Yiguang Jiang,Pande Zhang,Jun Wang,Shiqing Xu,Long Zhang
Al 2 O 3 : Er 3+ /Yb 3+ transparent ceramics codoped with Zn 2+ ions with intense upconversion and near infrared emission were prepared by conventional solid-state reaction and vacuum and hot isostatic pressing sintering. The effects of Zn 2+ incorporation to the structure, transparent, upconversion and NIR luminescence were discussed in detail. The as prepared Al 2 O 3 ceramics exhibited a total transmittance of ~ 75% in infrared regions (800–3300 nm) and ~ 50% in visible regions (500–800 nm). Under the excitation of a 980 nm laser diode , the as prepared Al 2 O 3 ceramics displayed two tense upconversion emission peaks of a green one centered at 550 nm and a red one centered at 660 nm and a tense near infrared emission peak centered at 1.532 µm, characteristic of Er 3+ emission. Compared with Er 3+ /Yb 3+ doped only, Zn 2+ codoped Al 2 O 3 :Er 3+ /Yb 3+ transparent ceramics showed higher upconversion and near infrared emission of ~ 11 times and ~ 4 times, respectively. The enhancement mechanism due to incorporation of Zn 2+ ions was also discussed in detail.
研究领域:
材料科学
·
光学材料
·
无机非金属材料
·
发光材料
·
陶瓷工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qunwei Guo,Xiaokun He,Jiaqi Geng,Jiawen Pan,Yuan Xue,Nan Xu,Bo Chi,Jian Pu
In this work, Ru is incorporated into Ni/Co to synthesize novel Al 2 O 3 -supported Ni-Ru/Co-Ru bimetallic catalysts. Tests verify their enhanced catalytic capability and durability and also reveal how each catalyst is deactivated. SEM and EDS results indicate that nanoparticle agglomeration on Ni-based surface triggers deactivation, and TG and XPS results suggest carbon deposition is fatal to Co-based catalysts. Implementing Ru effectively enhances catalytic activity and durability. To gain insight into the promoting effect of Ru, quantum mechanical methods are utilized to investigate the shifts in activation energies (E a ) in CH x * dehydrogenation processes on (1 1 1) surfaces. For the Ni catalyst, DFT calculations indicate that adding Ru decreases E a yet does not change the determining step. In contrast, adding Ru on the Co surface changes the major intermediates from CH* to CH 2 *, which inhibits further dehydrogenation , and hence mitigates carbon deposition to preserve the catalytic activity of the surface.
研究领域:
催化化学
·
材料科学
·
化学工程
·
量子化学
·
能量转换
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·Vol. 43
·期 16
·7973-7981
·
IF 4.229
Shaowei Yang,Hui Xie,Hongwei Zhu,Lijuan Zhang,Yunshan Zhou,Huixian Zhang,Zipeng Zhao
In this work, metal-organic framework compound CPL-1 of a formula {[Cu 2 (pzdc) 2 (pyz)]⋅2H 2 O} n (pzdc = pyrazine-2,3-dicarboxylate, pyz = pyrazine) possessing kinetic quantum sieving effect on H 2 /D 2 separation was selected to prepare two new chromatography stationary phase materials CPL-1@γ-Al 2 O 3 and MnCl 2 @CPL-1@γ-Al 2 O 3 by loading CPL-1 on γ-Al 2 O 3 particles with size 80–100 mesh through repeating in situ crystallization process , and afterwards by loading MnCl 2 on CPL-1@γ-Al 2 O 3 via impregnation approach. The two optimized materials were thoroughly characterized by IR, XRD , SEM, EDS and TG/DTA method. The experimental results showed that, under liquid nitrogen temperature by using just 1-m chromatographic column and cheap He gas as carrier gas, the MnCl 2 @CPL-1@γ-Al 2 O 3 can solve the problem of long separation time and trailing phenomenon existing in the CPL-1@γ-Al 2 O 3 column, can realize highly effective hydrogen isotope H 2 /D 2 separation with good separation resolution (R = 1.62) and approximate Gauss distribution of chromatographic peak, can be used for both qualitative and quantitative analysis of hydrogen isotope H 2 /D 2 with short separation time of 6.5 min.
研究领域:
分离科学
·
材料化学
·
物理化学
·
核化学
·
色谱学
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Wenting Kong,Yunlu Pan,Bharat Bhushan,Xuezeng Zhao
The separation of oil–water emulsion using superliquiphobic/philic porous coated materials has attracted considerable attention for dealing with environmental pollution and resource recycling issues. The coatings used may lack adequate surface mechanical and chemical durability. This paper proposes a simple method without other modifications for separating the oil–water emulsion. A porous layer was fabricated by superhydrophilic Al2O3 particles, which could separate oil–water emulsions. The particle layer has the property of underwater superoleophobicity after prewetting. For the oil-in-water (O/W) emulsion separation, a 0.3 μm Al2O3 particle layer was used. This layer had a pore size less than about 1 μm to minimize oil flow and to obtain a purity of oil recovery greater than 99 wt %. For the water-in-oil (W/O) emulsion separation, a 40 μm Al2O3 superhydrophilic particle layer was used. Larger particles were used to provide a more porous surface to facilitate oil flow through the layer, resulting in a purity of water recovery purity greater than 99 wt %.
研究领域:
环境科学
·
材料科学
·
分离技术
·
表面化学
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高影响因子
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