Materials
·
2021
·Vol. 14
·期 16
·4712
·
IF 3.623
Fan Hu,Jun Gao,Biao Zhang,Fugang Qi,Nie Zhao,Xiaoping Ouyang
In this work, a new composite material with excellent dynamic impact resistance and outstanding quasi-static mechanical properties was synthesized. The composite material is composed of a polyurethane elastomer and a novel nano-polymer. The nano-polymer was composed of silane coupling agent-modified alumina microspheres and functionalized ionic liquids by double bond polymerization. The universal testing machine and split Hopkinson pressure bar were used to characterize the compression behavior, strength and energy absorption of the composite materials under static and dynamic conditions. Additionally, the comprehensive mechanical properties of polyurethane elastomer with different nano-polymer loadings (0.5–2.5 wt.%) were studied. The results show that whether it was static compression or dynamic impact, the polyurethane elastomer with 1% nano-polymer had the best performance. For the composite material with the best properties, its compressive yield strength under the static compression was about 61.13% higher than that of the pure polyurethane elastomer, and its energy absorption of dynamic impacts was also increased by about 15.53%. Moreover, the shape memory effect was very good (shape recovery is approximately 95%), and the microscopic damage degree was relatively small. This shows that the composite material with the best properties can withstand high compression loads and high-speed impacts. The developed composite material is a promising one for materials science and engineering, especially for protection against compression and impacts.Keywords:impact resistance;ionic liquid;nano-Al2O3;polyurethane elastomer
研究领域:
材料科学
·
工程力学
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DOI
PubMed
高影响因子
Applied Materials Today
·
2025
·
IF 6.9
An Huang,Kai Tan,Xiulan He,Miao Wang,Mingyue Zhou
Porous ZrO 2 /Al 2 O 3 (ZTA) ceramic has shown great potential for fluoride removal from contaminated water owing to its tunable structure, high strength, and excellent chemical stability. The porosity, compressive strength, and fluoride adsorption rate of porous ZTA ceramics prepared by the direct foaming method were systematically studied. A machine learning framework integrating transfer learning, Bayesian optimization, and continuous model refinement was developed to predict and optimize performances of porous ceramics under small-sample conditions. It leverages prior knowledge and limited experimental data to simulate variable-performance relationships. Based on this model, it searches for optimal processing configurations and iteratively improves prediction accuracy. Under the optimal process parameters suggested by the model, the predicted performance (porosity of 91.51 %, compressive strength of 1.58 MPa, and fluoride adsorption rate of 71.71 %) shows strong agreement with experimental results (92.42 %, 1.49 MPa, and 72.49 %), confirming the predictive accuracy achieved through Bayesian optimization. Continuous learning further reduces the mean absolute percentage error of the three performances metrics from 1.02 %∼6.15 % to 0.87 %∼2.74 %, realizing more efficient and reliable material design under data-scarce conditions.
研究领域:
材料科学
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环境工程
·
化学工程
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计算材料学
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水处理技术
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DOI
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Qianyuan Zhang,Qihui Wang,Chunli Li,Pinggui Tang,Yongjun Feng
Addressing the challenges of simultaneously extracting Pd and Ag components from spent acetylene hydrogenation catalysts, severe structural damage to the Al 2 O 3 supports, and high wastewater discharge, here, we propose a “hydrochloric acid–ammonium chloride–ammonia” (HCl–NH 4 Cl–NH 3 ) complexation system that enables efficient extraction of PdAg leaching alongside recovery of the Al 2 O 3 supports. The leaching rates of Pd and Ag exhibit an increasing trend with rising concentrations of HCl, NH 4 Cl, and NH 3 , the increase of reaction temperature, and the extension of reaction time. Nevertheless, excessively high HCl concentration, overly elevated reaction temperature, and unduly prolonged reaction time caused some damage to the structure of the alumina support and reduce its mechanical strength. Under optimized conditions (0.2 M HCl, 1.0 M NH 4 Cl, 120 °C, 6 h, 5 wt% ammonia), the PdAg components were efficiently leached while effectively preserving the crystal phase and pore structure of the Al 2 O 3 beads. The leaching rates of Pd and Ag reached 95.6 % and 94.4 %, respectively; and the recovered Al 2 O 3 beads have a pore diameter of 30.8 nm, a specific pore volume of 0.244 mL g −1 , a specific surface area of 29.2 m 2 /g, and a crushing strength of 53.2 N, corresponding to retention rates of 95.2 %, 96.0 %, 100.2 %, and 98.6 %, respectively. The HCl–NH 4 Cl–NH 3 complexation system, combined with cyclic washing, shows advantages of low cost, mild extraction conditions, and reduced wastewater discharge, which keeps to the principles of green development.
研究领域:
环境化学
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资源循环利用
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工业催化
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材料回收
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绿色化学
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DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Shijun Huang,Yu Song,Shansi Zhong,Panpan Chang,Jinshi Dong,Jiaqiang Yang
Ni based catalysts are widely used in dry reforming of methane (DRM) but still face the issue of deactivation caused by sintering and carbon deposition. Pt doped Ni-Al 2 O 3 catalyst was found of great durability which kept 100 % conversion of CO 2 over 300 h without detectable loss in activity at 700 °C, while Ni-Al 2 O 3 catalyst only maintained ∼10 h at the same condition. It is revealed that Pt and Ni are separately dispersed on Al 2 O 3 with the structure of small Pt particles distributing around Ni like satellites. Kinetic experiments, temperature-programmed surface reactions (TPSR) and DFT calculations indicated that CH 4 prefers to dissociatively adsorb on Pt surface but is hard to deeply crack to carbon because of the high energy barriers. As a result, the respective adsorption of CO 2 on Ni and CH x on Pt surface largely reduced the bear of competitive adsorption and activation of both reactants on individual Ni and thus brought enhanced activity. Additionally, surrounding Pt effectively suppresses the sintering of Ni during reaction.
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高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Lin Zhou,Zikang Hou,Xiangze Kong,Shuangjiang Pan,Bingcheng Liu,Tao Zhao,Xiaoya Jiang,Zhiqiang Shi,Jing Wang
Cellulose-based separators offer sustainability and renewability, yet their poor mechanical strength and large pore size often result in insufficient cycling stability and safety risks in sodium-ion batteries (SIBs). In this work, a sandwich-structured separator (LF-ALO), consisting of a cellulose-based paper (LF) core coated on both sides with electrospun polyacrylonitrile (PAN)/aluminum oxide (Al 2 O 3 ) layers. Compared with LF, LF-ALO exhibits elevated mechanical strength (19.7 MPa), and markedly improved electrolyte wettability (316 %) owing to the robust interconnected fibrous network constructed by PAN and Al 2 O 3 , which facilitate uniform Na + transport and reduce short-circuit risks by optimizing the pore structure of LF. LF-ALO also achieves a high Na + transference number (t Na+ = 0.85), reducing internal resistance and enhancing charge-discharge efficiency. A half-cell with NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM) cathode delivers 130 mAh g −1 at 0.1C, retains 95.86 mAh g −1 after 100 cycles, and demonstrates superior rate capability. The high mechanical strength, uniform pore structure, and efficient Na + transport of LF-ALO enhance long-term cycling and contribute to safe operation, highlighting cellulose-based composites for next-generation SIBs.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Junjie Wang,Kai Wang,Yuanfeng Chen,Yu Xue,Xinlei Wang,Weiguang Lan,Shengqiong Fang,Rong Fan
This study addresses deficiencies in the anti-fouling properties and long-term operational stability of ceramic membranes exhibiting excellent oil-water separation performance. Using a combined deposition and low-temperature reduction approach, hydrophilic polydopamine (PDA) and transition metal single-atom cobalt (Co 1 ) were immobilized onto alumina ceramic membrane surfaces to fabricate a superhydrophilic anti-fouling Al 2 O 3 ceramic membrane. The separation performance of this membrane for oil/water emulsions was subsequently systematically investigated. The doping of PDA endows the membrane with remarkably high oil/water separation efficiency (above 99 %) and flux (705.6 ± 34.1 L m −2 ·h −1 ). In the Ammonium persulfate (APS) system, Co 1 , through valence state cycling (Co 2+ /Co 3+ ), generate ·OH and SO 4 · - radicals, which promote the free radical chain reaction and endow the membrane with self-cleaning ability. The synergistic molecular interactions within the composite architecture bestow exceptional structural integrity during continuous multiphase separation operations, while establishing innovation in membrane longevity enhancement through energy-barrier elevation against interfacial fouling degradation mechanisms. This work provides a novel strategy for developing anti-fouling membranes with high efficiency in oil-water separation.
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PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Yuezhan Feng,Chengen He,Yingfeng Wen,Xingping Zhou,Xiaolin Xie,Yunsheng Ye,Yiu-Wing Mai
Interfacial tailoring is always the key to preparing high-performance polymer-based thermal conductive composites (PTCs). Herein, we reported a multi-functional interface tailoring approach to simultaneously improve the thermal conductivity , flame retardancy, thermal and mechanical properties of PTCs, by forming a core-shell structured graphene oxide coating Al 2 O 3 hybrid (Al 2 O 3 @HGO). Simultaneously a flame retardant bridging agent was introduced to improve the coating amount and flame retardant efficiency of the hybrid. The morphology analysis revealed the significant reinforcement of interfacial interaction of Al 2 O 3 in epoxy (EP) by HGO coating. As a result, such the interfacial tailoring induced both the significant decrease in interfacial thermal resistance and the formation of additional thermal conductive paths by the graphene coating layer , resulting in the significant improvement in thermal conductivity of EP/Al 2 O 3 @HGO composites. The flame retardant parameters, peak heat release rate , total heat release and total smoke production, showed a 49.3%, 40.9% and 71.2% reduction, respectively, comparing to neat EP, which was ascribed to the strong interface with GO coating layer and the flame retardant bridging agent catalyzed charring to form an intact and compact char protective layer with Al 2 O 3 . Moreover, the strong interfacial interaction also restricted the segment movement, increasing the storage modulus and T g .
研究领域:
材料科学
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热管理技术
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阻燃材料
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 8
·1439
·
IF 2.468
Yue Teng,Ke Yao,Wenbin Song,Yongjun Sun,Haoliang Liu,Zhiying Liu,Yanhua Xu
Cu-Mn-Ce@γ-Al2O3was prepared by incipient wetness impregnation and used to catalyze ozonation in a coal chemical wastewater-biotreated effluent. The preparation factors that considerably affected the catalytic performance of Cu-Mn-Ce@γ-Al2O3, specifically metal oxide loading percentage, calcination temperature, and calcination time, were examined. The catalyst was characterized by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, and Brunauer-Emmett-Teller analysis. The optimal catalytic ozonation operating parameters, such as ozone dosage, catalyst dosage, pH, and reaction time, were also investigated. Results showed that an optimized catalyst consisted of 17.0% CuO, 3.0% MnO2, and 2.0% CeO2(wt.%). The optimal calcination temperature and calcination time were 600 °C and 5 h. The optimal catalytic ozonation operating parameters, including ozone dosage, catalyst dosage, pH, and reaction time, were 7, 80.0 mg/L, 20.0 mg/L, 7 and 50 min, respectively. The COD removal of biotreated effluent increased to 61% under these optimal operating conditions. Meanwhile, ozonation alone resulted in only 20% removal. This work proposes the use of easily available Cu-Mn-Ce@γ-Al2O3catalyst and might drive the advancement of catalytic ozonation for chemical wastewater purification.Keywords:catalyst;catalytic ozonation;coal chemical wastewater;advanced treatment
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70416
·
IF 3.8
Junjie Shi,Sheng Li,Chenglin Kang,Futong Li,Min Chen,Shizhuo Yin,Jianzhong Li
This study presents the first systematic experimental determination of phase equilibria in the Er 2 O 3 –Al 2 O 3 –SiO 2 system at 1600°C in air, employing the high-temperature isothermal equilibration method followed by rapid drop-quenching to preserve high-temperature phase assemblages. The mineralogy and chemical compositions of the equilibrated samples were analyzed by x-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe x-ray microanalysis (EPMA). One single liquid equilibria, five two-phase equilibria (liquid–SiO 2 , liquid–Er 2 Si 2 O 7 , liquid–Er 3 Al 5 O 12 , liquid–Al 2 O 3 , and liquid–mullite) and seven three-phase equilibria (liquid–SiO 2 –Er 2 Si 2 O 7 , liquid–Er 2 Si 2 O 7 –Er 2 SiO 5 , liquid–Er 2 SiO 5 –Er 3 Al 5 O 12 , liquid–Er 3 Al 5 O 12 –Al 2 O 3 , liquid–Al 2 O 3 –mullite, Er 2 O 3 –Er 2 SiO 5 –Er 4 Al 2 O 9 , Er 3 Al 5 O 12 –Er 2 SiO 5 –Er 4 Al 2 O 9 ) were observed in the equilibrium ternary system. The 1600°C isothermal section of the Er 2 O 3 –Al 2 O 3 –SiO 2 phase diagram in air ( p O 2 = 0.21 atm) was constructed based on the present experimentally determined equilibrium phase compositions. The liquid area and the primary fields of SiO 2 , Er 2 Si 2 O 7 , Er 3 Al 5 O 12 , Al 2 O 3 , and mullite were constructed. The comparison of the present experimental results deviate significantly from the modelling by FactSage (version 8.3) using its “ FactPS ” and “ FToxid ” databases, suggesting that FactSage underestimated the stability of the liquid phase under the present experimental conductions.
研究领域:
材料科学
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陶瓷
·
相图
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高温材料
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腐蚀科学
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热力学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Sheng Li,Chaoqi Zhao,Rui Zhang,Junjie Shi,Yuyan Wu,Xiao Zhang,Chuan Wang,Shizhuo Yin,Yandong Li,Jianzhong Li
The Ho 2 O 3 -Al 2 O 3 -SiO 2 system exhibits great application potential for advanced environmental barrier coatings and multifunctional materials, whereas critical high-temperature phase equilibrium data remain scarce. In this work, the 1600 °C isothermal section of the ternary system was systematically constructed using equilibration and quenching experiments, combined with X-ray diffractometry (XRD), scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and differential scanning calorimetry (DSC). Crucially, the thermodynamic stability of the Ho 2 Si 2 O 7 phase at 1600 °C and above is confirmed, refining the previously reported Ho 2 O 3 -SiO 2 binary phase diagram. At 1600 °C, the Ho 2 O 3 -Al 2 O 3 -SiO 2 system comprises one liquid-phase region, eleven two-phase regions, and nine three-phase regions. The eutectic temperature of the system was measured to be 1359 °C, corresponding to the reaction L ⇋ SiO 2 + Ho 2 Si 3 O 9 + mullite. The solid-solution mechanisms were determined for the two phases Ho 9.33+2 x (Si 1- x Al x O 4 ) 6 O 2 ( x = 0-0.09) and Ho 4 Al 2(1- x ) Si 2 x O 9+ x ( x = 0-0.33). Comparison with FactSage 8.3 calculations reveals that current commercial databases exhibit significant deficiencies for the Ho 2 O 3 -SiO 2 binary system. This study further improves the thermodynamic database of rare-earth oxides. The findings not only provide key data for optimizing CALPHAD thermodynamic models, but also offer an important basis for the composition design and phase regulation of environmental barrier coatings intended for extreme environments.
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DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2026
·
IF 8.2
Zhaoxu Sun,Guangping Song,Hongming Zhang,Yusen Xie,Zhiyao Lu,Jinze Zhang,Xiaodong He,Yuelei Bai
Continuous alumina fiber-reinforced oxide composites (Al 2 O 3f /Oxide) are considered highly promising electromagnetic protection carrier materials for aerospace applications due to their excellent thermal stability, high strength, thermal insulation capability, and porous loadable structure. In this work, Al 2 O 3 -3YSZ@SiOC- n C ceramic spheres with a core–shell structure were prepared via a polymer-derived ceramic route. Subsequently, a continuous aluminosilicate fiber (AF18)/Al 2 O 3 -3YSZ@SiOC- n C composites were successfully fabricated by integrating the ceramic spheres with AF18 fibers through a hot-pressing process. Their microstructure, phase composition, thermal properties, and electromagnetic protection performance and mechanisms were systematically investigated. Benefiting from the synergistic effects of multiple components, the AF18/Al 2 O 3 -3YSZ@SiOC-1C composites exhibit excellent electromagnetic wave absorption (EWA) performance, with a minimum reflection loss of −43.07 dB at 9.5 GHz and a thickness of 2.6 mm, accompanied by an effective absorption bandwidth of 3.5 GHz. By adjusting the carbon content, the composites successfully surpassed the percolation threshold, enabling the functional transition from EWA to electromagnetic interference shielding. Therefore, this work provides an effective strategy for the design and fabrication of Al 2 O 3f /Oxide-based composites with tunable electromagnetic protection functions.
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高影响因子
JOM
·
2026
·
IF 2.3
Deng Chuheng,Qin Yufeng,Shen Yi,Rao Longshi,Wang Shuangxi
Metallized ceramic substrates are essential for power electronics, offering superior thermal and electrical conductivity. However, traditional metallization techniques, such as thick printed copper (TPC), face significant challenges, including weak bonding strength, high sintering temperatures, and complications associated with glass frit, which ultimately compromise device reliability and performance. To address these issues, this study presents an efficient method for fabricating high-performance copper (Cu) films on Al 2 O 3 ceramic substrates using low-temperature, pressureless sintering. By incorporating a magnetron-sputtered copper interlayer combined with printed copper paste, we eliminate the need for glass frit, a conventional component that often introduces defects. Through careful optimization of copper powder synthesis and paste formulation, we achieved dense, low-porosity Cu films sintered at just 300°C, which demonstrate exceptional electrical conductivity (1.7 × 10 7 S m −1 ) and shear strength (31.5 MPa). The sputtered copper interlayer significantly enhances the adhesion between the copper film and the ceramic substrate, minimizing delamination and improving mechanical integrity when compared to traditional sintering methods. This approach addresses key challenges in power device packaging, providing a cost-effective, reliable solution for low-temperature, high-performance interconnections. The results have wide-reaching implications for advancing electronic packaging, especially in power electronics, by enabling durable, efficient, and scalable manufacturing processes.
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高影响因子
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