CERAMICS INTERNATIONAL
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2025
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IF 5.6
Nannan Zhu,Jingyu Wang,Lijuan Zhang,Guangwu Wen
In this paper, a low-shrinkage, high mechanical properties vat photopolymerization 3D-printed alumina ceramic preparation process without alone debinding was investigated for the first time through the optimization of photosensitive resin formulations. The low-viscosity alumina ceramic slurry with a solid content of 65 vol% could be 3D-printed into a green body. When the sintering temperature was 1620 °C, the bending strength and Vickers hardness of the Al 2 O 3 ceramics reached a maximum value of 482.5 MPa and 13.5 GPa. At this point, the shrinkage of the samples in different directions (X, Y, and Z axis) was 8.7 %, 9.2 %, and 9.4 %, respectively. Moreover, mullite was generated in situ during the sintering process with the formation mechanism analyzed. The research findings indicate that the introduction of silicon-containing polymers into the slurry can significantly hold promise for breakthroughs in industrial applications of large-sized and complex-structured alumina ceramics.
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高影响因子
Journal of Composites Science
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2025
·Vol. 9
·期 5
·252
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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.
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Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 5
·1-14
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IF 6.048
Li Yuchen,Chen Zhen,Zhang Xiangyu,Yang Kun,Wang Lidong,Li Junhua
As a promising option to provide gaseous NH 3 for SCR system, catalytic urea hydrolysis has aroused great attention, and improving surface area and activity of catalysis are the crucial issues to be solved for efficient urea hydrolysis. Therefore, a composite metal oxide (TiO 2 @Al 2 O 3 ) catalyst was prepared by a simple hydrothermal method, with mesoporous alumina (γ-Al 2 O 3 ) as substrate. The results verify the mesoporous structure and submicron cluster of TiO 2 @Al 2 O 3 , with exposed crystal faces of (101) and (400) for TiO 2 and γ-Al 2 O 3 , respectively. The electronegativity difference of Ti 4+ and Al 3+ changes the charge distribution scheme around the interface, which provides abundant acid/base sites to boost the urea hydrolysis. Consequently, for an optimal proportioning with nano TiO 2 content at 10 wt.%, the hydrolysis efficiency can reach up to 35.2 % at 100 °C in 2 h, increasing by ∼7.1 % than that of the blank experiment. 13 C NMR spectrum measurements provide the impossible intermediate species during urea hydrolysis. Theoretical calculations are performed to clarify the efficient H 2 O decomposition at the interface of TiO 2 @Al 2 O 3 . The result offers a favorable technology for energy-efficiency urea hydrolysis.
研究领域:
环境科学
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催化化学
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Wenyao Duan,Siwei Liu,Chunhao Wang,Guangmei Cao,Chunyun Hu,Xia Jiang
Green hydrogen production from biomass via gasification process is an emerging and widely concerned technology. However, tar as a byproduct of the gasification process can clog and corrode gasification equipment, thereby reducing gasification efficiency. While steam reforming technology can efficiently convert tar into H 2 , the catalyst deactivation remains a significant challenge. This research synthesized novel NiAl catalysts by one-pot evaporation-induced self-assembly (EISA) method for converting tar into H 2 . The results revealed that the 2.4-NiAl-7 catalyst was the most active, achieving a toluene conversion rate of 99.9 %, a hydrogen yield of 181.2 mmol/g toluene at 750 °C, and demonstrating excellent resistance to carbon deposition and long-term stability with a steam/carbon(S/C) ratio of 3. A series of characterizations confirmed that moderate metal-support interaction was crucial because of the confinement effect (embedding Ni nanoparticles into the mesopore) and the unique NiAl spinel structure. Additionally, the SRT performance (gas yields) was found to be positively correlated with the degree of Ni dispersion. This research reveals new insights in designing a catalyst for long-term practical applications in the conversion of tar into H 2 during steam reforming.
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Journal of Science-Advanced Materials and Devices
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2025
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IF 6.8
Shuting Zhang,Yuhan Dou,Dan Liao,Xu Long,Qi Lin,Shusen Wei,Chen Jin,Xuan Wu,Hong Dong,Yanjiang Song,Zhirong Qu,Chuan Wu
This study tackles thermal management challenges in high-power electronics by developing trimethoxy-terminated polydimethylsiloxane (PDMS) with tailored branched architectures (TTMOS series) as surface treatment agents (STAs) for AlN/Al 2 O 3 hybrid fillers. We systematically optimized filler size distribution, STA structure, and matrix viscosity to enhance thermal interface material (TIM) performance. Critical findings reveal that a hybrid filler mass ratio of 120 μm AlN: 3 μm Al 2 O 3 : 0.5 μm Al 2 O 3 = 8:4:2 (87 vol% loading) delivers exceptional thermal conductivity ( λ = 9.74 W m −1 K −1 ), low thermal resistance ( θ = 2.86 K cm 2 W −1 ), balanced penetrability (54.6/0.1 mm), and oil resistance ( R 16h = 1.50). Branched STAs, such as TTMOS-T1, significantly outperform linear analogues by enhancing interfacial compatibility, suppressing particle agglomeration (validated via SEM/XPS), and reducing oil seepage ( R 16h = 1.45 vs. 1.77 for TTMOS-I), while maintaining a high thermal conductivity ( λ = 9.79 W m −1 K −1 ). A 100 mPa s Me-PDMS matrix further ensures post-thermal cycling stability, with λ increasing from 9.13 to 9.26 W m −1 K −1 . Practical validation demonstrates that TTMOS-T1-modified grease reduces the surface temperature of a 30 W HB-LED chip by 10 °C versus commercial TIMs, highlighting its real-world efficacy.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Minghui Sun,Xiangqian Quan,Xi Ma,Hetuo Chen,Xianpeng Qin,Guohong Zhou
The effects of TiO 2 content and sintering temperature on the electrical and mechanical properties of the alumina ceramics prepared via vacuum sintering were investigated. The sample comprises the phases of Al 2 O 3 , MgAl 2 O 4 , and Al 2 TiO 5 . Under vacuum sintering conditions, oxygen atoms in TiO 2 detach from the crystal lattice, forming quasi-free electrons, oxygen vacancies and Ti 3+ , thereby reducing the volume resistivity of alumina ceramics. XPS (X-ray photoelectron spectroscopy) analysis revealed that the increasing TiO 2 content facilitates the transformation of Ti 4+ to Ti 3+ , while elevated sintering temperatures further enhance Ti 3+ concentration, attributed to the enhanced lattice activity of TiO 2 . The increasing TiO 2 generated more Al 2 TiO 5 with Al 2 O 3 , which accumulated at grain boundaries, inhibiting grain growth through a pinning effect and forming more uniform and smaller grains, thereby enhancing mechanical property. Optimal comprehensive properties were achieved at a sintering temperature of 1500°C with 6 % TiO 2 content, demonstrating a density of 3.88 g/cm 3 , volume resistivity of 1.2×10 11 Ω·cm, dielectric strength of 3.6×10 6 V/m, hardness of 14.4 GPa, and thermal conductivity of 17 W/(m·K). The series of outstanding performances confirm that Al 2 O 3 ceramic with TiO 2 doping is an excellent candidate material in advanced semiconductor processing.
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OZONE-SCIENCE & ENGINEERING
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2025
·
IF 1.4
Zhibo Liu,Jing Zhang,Jingcheng Wei,Bingyan Zhu,Tingfeng Xue,Xiaofu Li,Liwei Pan
To address the challenges posed by highly toxic and recalcitrant compounds in phenol-containing wastewater, a novel CoAl2O4/γ-Al2O3 catalyst was synthesized via an impregnation-calcination method and applied for catalytic ozonation of phenolic wastewater. The catalyst was thoroughly characterized using X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma (ICP) analysis. The catalyst’s abundant Lewis acid sites act as active centers, promoting the decomposition of ozone into reactive oxygen species. This study elucidates the pathways by which the CoAl2O4/γ-Al2O3 catalyst synergistically activates O3 to generate O2·−, ·OH, and 1O2, revealing that phenol mineralization primarily proceeds through ·OH and 1O2-mediated oxidation. Compared to ozonation alone, the CoAl2O4/γ-Al2O3 catalyst demonstrates superior O3 activation capability, significantly enhancing the phenol mineralization efficiency from 13.5% to 56.5% while improving ozone utilization (mgTOCremoved/mgO3consumed) from 0.02 to 0.08. Remarkably, the catalyst maintains excellent stability over multiple reaction cycles. Toxicity evaluation confirms substantial reduction in biotoxicity of the treated wastewater. These findings collectively demonstrate that CoAl2O4/γ-Al2O3-based catalytic ozonation represents an efficient and promising technology for phenolic wastewater treatment.
研究领域:
环境科学
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催化化学
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水处理技术
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高级氧化工艺
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材料化学
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高影响因子
Surfaces and Interfaces
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2025
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IF 6.3
Kai Yang,Junhao Wang,Dian Yu,Pengqiuyue Pu,Hang Li,Zihao Chen,Yangyang Tang,Zhao Fang
As mineral resources are developed and exploited, the proportion of low-grade zinc ore increases. The concentrations of F - exceeding the optimal range may pose a risk to zinc hydrometallurgy . In the present research, Al 2 O 3 -ZnO microspheres (AZO) characterized by a substantial specific surface area were synthesized through a hydrothermal-roasting technique and applied in industrial zinc sulphate fluoride removal. The optimal adsorption conditions for AZO and the underlying adsorption mechanism were investigated. The results indicated that the adsorption at 12 g·L -1 dosage, original pH=5.32 of the solution and 323 K for 75 min, when the fluoride concentration was reduced to below 50 mg·L -1 , the fluoride removal percentage reached 73.32 %, and the adsorption capacity was 8.55 mg·g -1 . Kinetic studies revealed that AZO exhibited surface inhomogeneity, functioning as a heterogeneous adsorbent, with the fluoride adsorption process being predominantly chemical in nature. The isotherm model suggested that the removal process was characterized by homogeneous adsorption of a monomolecular layer, with a theoretical maximum adsorption capacity of AZO estimated at 9.479 mg·g -1 . FT-IR and XPS analyses demonstrated that the defluorination process occurs through ion exchange between F - and -OH, as well as the formation of Zn/Al-F complexes. Consequently, AZO present a novel approach for developing an effective adsorbent for defluorination in industrial ZnSO 4 solutions.
研究领域:
环境化学
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湿法冶金
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材料科学
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吸附技术
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废水处理
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高影响因子
Catalysts
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2025
·Vol. 15
·期 11
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IF 4
Juan Du,Wanting Qiu,Sunbal Ayaz,Jian Long,Wenze Guo,Ling Zhao,Zhenhao Xi
2,5-furandicarboxylic acid (FDCA), a high-value biomass-derived monomer, serves as a crucial building block for sustainable polymers including polyesters, polyamides, and polyurethanes. This study systematically investigated the catalytic oxidation of 5-hydroxymethylfurfural (HMF) to FDCA over Pt/Al2O3and Pt–Bi/Al2O3catalysts. The 5Pt/Al2O3catalyst yielded 60.6% FDCA after 12 h under optimized conditions (80 °C, 0.1 MPa O2, 1 equiv. Na2CO3). Remarkably, Bi-modified 5Pt–1Bi/Al2O3catalyst dramatically enhanced catalytic performance, achieving 94.1% FDCA yield within 6 h under optimized conditions (80 °C, 1.5 MPa O2, 2 equiv. Na2CO3). Comprehensive characterization revealed that the exceptional activity originates from Bi–O–Pt interactions that modulate the electronic structure and oxidation state of Pt active sites, which facilitates the oxidation of intermediate 5-formyl-2-furancarboxylic acid (FFCA) to FDCA, the rate-limiting step of HMF oxidation. This work demonstrates an efficient Bi-promoted Pt catalytic system for FDCA production with significant potential for industrial application.
研究领域:
催化化学
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可再生能源
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绿色化学
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生物质利用
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可持续聚合物
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INTERNATIONAL JOURNAL OF THERMOPHYSICS
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2025
·Vol. 47
·期 1
·7
·
IF 2.9
Zhang Qiang,Han Yongliang,Ren Jiayao,Wu Fangli,Zhang Rixin,Yang Yuxin,Bi Shengshan
The dispersion stability and thermophysical properties of ternary composite nanofluids (NF) containing graphene oxide (GO), aluminum oxide (Al 2 O 3 ), and silica (SiO 2 ) at different concentrations and ratios, with water-based ethylene glycol and 1,2-butanediol added as antifreeze agents, were investigated. First, the ternary nanofluid was prepared using a two-step method, and the prepared nanoparticles were characterized using field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The influence of surfactant addition on the stability of the nanofluid was analyzed. The density and thermal conductivity (TC) of NF were measured at different volume concentrations (0.2–0.6 vol%) and temperature ranges (298.15–333.15 K and 293.15–363.15 K, respectively). As the GO concentration increased, the proportion of thermal conductivity improvement showed a stepwise increase with concentration changes. When the GO concentration reached 80 % in the three types of nanoparticles, the thermal conductivity of NF at 363.15 K was 58 % higher than that of the base fluid. For the two different base fluids, under the same ratio, concentration, and temperature conditions, the base fluid containing 1,2-butanediol showed a more significant effect in enhancing thermal conductivity.
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POWDER TECHNOLOGY
·
2015
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IF 2.349
Ping Liu,Yongwei Zhu,Shangwen Zhang
When hydrophobic particles are employed to prepare self-lubricating electroless composite coatings , they usually require surface modification to improve their wettability . The study focuses on the resultant change in wettability of the MoS 2 particles with an inorganic coating . Al 2 O 3 -coated MoS 2 particles were prepared by using a heterogeneous nucleation process. Then, particle surface morphology and structure were examined by using SEM, EDS and XRD . Contact angle measurements were conducted by using a thin layer wicking technique and a sessile drop method in order to determine the surface free energy components of the bare and the coated MoS 2 particles. Our results showed the MoS 2 particles were successfully coated with an Al 2 O 3 layer, which is an amorphous structure. The decreased water contact angle indicates an enhanced hydrophilicity for the coated particles. This decrease depends more strongly on a significant decrease of a new parameter ratio, γ + /γ − , than on a slight increase in total surface free energy. The surface energy component of the bare MoS 2 is very consistent with that of Talc, and that of the Al 2 O 3 -coated one is very similar to that of alumina , apart from the base component.
研究领域:
材料科学
·
表面化学
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Qingguo Chi,Xubin Wang,Changhai Zhang,Qingguo Chen,Minghua Chen,Tiandong Zhang,Liang Gao,Yue Zhang,Yang Cui,Xuan Wang,Qingquan Lei
In this paper, the one-dimensional (1D) Al2O3 nanofibers (Al2O3 NFs), CaCu3Ti4O12 nanofibers (CCTO NFs), and core–shell CaCu3Ti4O12@Al2O3 nanofibers (CCTO@Al2O3 NFs) were prepared via electrospinning technique. The surface modification with dopamine (PDA) was employed for the above three kinds of nanofibers before being filled the PVDF matrix, which can improve their dispersion and compatibility with the matrix. The microstructure, dielectric properties, leakage current density, breakdown strength, and energy storage performance of composites with three kinds of filler, CCTO NFs/PVDF, Al2O3 NFs/PVDF, and CCTO@Al2O3 NFs/PVDF, were systematically investigated. By comparing the three composites, it can be found that energy storage density of CCTO@Al2O3 NFs/PVDF were enhanced compared to that of pure PVDF, which can be attributed to improvement of polarization and electric breakdown strength. The energy density of 8.46 J/cm3 at 340 kV/mm was obtained for 4 vol % CCTO@Al2O3 NFs/PVDF nanocomposites, which is 230% larger than that of PVDF (3.68 J/cm3 at 330 kV/mm). This study provides a method for preparing high energy storage PVDF-based composite film which can be used for the next generation of dielectric capacitors.
研究领域:
材料科学
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能源存储
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高影响因子
危险品化学品经营许可证（带存储）