Chinese Physics B
·
2025
·
IF 1.5
Wenxia Zhang,Weixia Shen,Chao Fang,Ye Wang,Yuewen Zhang,Liangchao Chen,Qianqian Wang,Kenan Li,Biao Wan,Zhuangfei Zhang
Improving the thermal conductivity of diamond-metal composites has always been a significant challenge in the field of thermal management. In this paper, diamond/Al composites were systematically studied, and the influence of holding time (10-120 min) on interface structure and thermal conductivity was discussed. The research results shows that the long-term thermal diffusion sintering can effectively the dense interfacial bonding of diamond/Al composites and enhance the thermal conductivity. The diamond/Al composites with 50 vol% 900 μm diamond attained the highest value of 888.73 W/mK under the sintering conditions of 650 ℃, 50 MPa, and 120 min, nearly 92% of the theoretical value predicted by the Maxwell model. This study establishes that high thermal conductivity can be achieved through long-term thermal diffusion alone, without the complex diamond surface coating and substrate alloying.
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Plasma Processes and Polymers
·
2024
·
IF 2.9
Rongzhao Jia,Shenli Jia,Jiajian Zhang,Yongpeng Mo,Zongqian Shi
A method for in situ fabrication of Al@C nanocomposite energetic additives through pulsed discharge in liquid cyclohexane has been proposed. The obtained Al@C nanocomposites consist of large aluminum nanoparticles (over 100 nm) enveloped by fullerenes and a carbon matrix with smaller aluminum particles (under 100 nm) embedded within. DSC–TGA curves indicate that the heat release of Al@C is higher than that of micron-sized and nano-sized aluminum particles. Al@C nanocomposites effectively reduce the ignition delay for liquid fuels. The energy efficiency of this method is much higher than that of continuous arc ablation, with a yield of up to 2.5 mg/min. This method allows for the simple, convenient, and safe fabrication of energetic additives, presenting a promising prospect for large-scale industrial production.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jingxian He,Zhen Jiang,Yuan Liu,Zhenfeng Jing,Shuhui Sun,Haixia Zhang,Fengqing Zhang
This study successfully synthesized bismuth ferrite (BFO) thin films co-doped with europium (Eu) and aluminum (Al) using the sol-gel method, while comprehensively investigating their performance characteristics. By systematically adjusting the Al doping ratio in Bi 0.98 Eu 0.02 Fe1 -x Al x O 3 (with x = 0, 0.01, 0.03, 0.05, 0.07), significant changes in the material properties were observed. XRD and Raman spectroscopy validated the presence of R 3 c and Pnma phases in the synthesized BFO thin films, which demonstrated excellent crystallinity. Microstructural and compositional assessments, performed using SEM and XPS, indicated that the BEFAO5 sample possessed high crystallinity and a relatively low oxygen vacancy content. These characteristics enhanced the exceptional current-voltage (J-V) properties and ferroelectric behavior of BEFAO5. Additionally, the influence of vacancy defects on the ferroelectric efficiency and durability of BFO ferrite thin films was examined. The results indicated that the co-doping approach significantly improved the material's resistance to aging. In summary, the combined doping of Eu and Al not only substantially modified the crystalline structure and physical attributes of BFO thin films but also markedly enhanced their potential for applications in energy storage and spintronic technologies.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Songlin Wang,Yu Guo,Qi Liu,Peng Yang,Huabo Li,Lei Liang,Hongying Niu,Qiying Zhang,Yanyan Liu,Jianji Wang
The synthesis of carbonates by using nontoxic feedstocks and ecofriendly heterogeneous catalysts has received great attention but remains a significant challenge. Herein, a series of Mg/Al-codoped porous carbons (MgAl@CM) were developed and applied for transesterification to synthesize methyl phenyl carbonate (MPC). The results showed that MgAl@CM possessed abundant mesopores, large amounts of N/O-containing groups, and dispersed Mg/Al species. And 1Mg5Al@CM-700 exhibited the highest catalytic activity with a diphenyl carbonate conversion of 80.2% and MPC selectivity of 99.6% due to its unique structure and acidic–basic properties, indicating a highly efficient acid–base synergistic catalysis process. Moreover, the catalyst presented good stability and reusability for six recycles without a substantial activity loss. The mechanism based on the synergistic catalysis was investigated. This work provides a novel perspective for the design of heteroatom-doped carbon catalysts to accomplish an efficient MPC synthesis.
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Defence Technology
·
2025
·
IF 5.9
Ting Liu,Jian Wang,Jie Chen,Cui Nie,Yaofeng Mao,Jun Wang,Ruolei Zhong,Wei Cao,Fude Nie
Aluminum (Al) powder is widely applied in thermobaric explosives due to its high energy density and favorable reaction kinetics. However, the inert oxide layer (Al 2 O 3 ) on Al particles limits combustion reactivity and energy efficiency. Fluoride-based surface modification has been developed as an effective approach to address this issue. Here, four classical fluoropolymers (F11, F14, PVDF, PTFE) are employed as coatings to prepare core-shell Al/Fluoropolymer. The combustion experimental results demonstrate that the core-shell Al/PTFE exhibits the highest flame propagation rate (52.88 mm·ms -1 ) and pressure output (109.02 kPa) performance. Consequently, core-shell Al/PTFE is selected as a high-energy fuel to prepare RDX/Al/PTFE microspheres via the emulsion and solvent evaporation method, which can enhance the energy performance of RDX. The effects of the core-shell Al/PTFE ratio and RDX content on the combustion heat and pressure output are systematically investigated. The peak pressure reaches a maximum of 187.8 kPa when the mass ratio of RDX, Al, and PTFE is 60: 25: 10. Additionally, RDX/Al/PTFE microspheres exhibit significantly higher laser-induced air shock velocities, detonation heat, and detonation pressure than those of pure RDX and RDX/Al. The mechanism underlying the enhanced reactivity and energetic performance is attributed to the ability of PTFE to etch the inert Al 2 O 3 shell on the surface of Al particles, thereby improving post-combustion reactions and significantly increasing the overall energy output of RDX explosives. This work offers a novel design strategy for high-energy structural thermobaric explosives for the practical applications.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Ying Wang,Tengfei He,Jingguo Cao,Ke Li,Chengqian Wang,Qun Liu,Yu Zhang
This study demonstrates a sustainable strategy for synthesizing MIL-53(Al) and ZSM-5 zeolite through dual-waste synergy using coal fly ash (CFA) and waste polyethylene terephthalate (PET). A sequential alkaline fusion-acid leaching protocol selectively fractionated CFA into aluminum-rich solutions and silica residues, while alkaline hydrolysis of PET liberated terephthalic acid (PTA) as organic ligands. The Al 3+ -PTA coordination under solvothermal conditions produced MIL-53(Al)(CFA-PET) exhibiting well-defined 1D rhombic channels with a high BET surface area (1303 m 2 ·g −1 ), whereas hydrothermal crystallization of silica residues yielded ZSM-5(CFA), which formed spherical aggregates composed of 100 nm nanosheets with 89.9 % yield and a surface area of 311 m 2 ·g −1 . Structural advantages were evidenced by exceptional adsorption performance: MIL-53(Al)(CFA-PET) achieved 96.24 % methylene blue removal at pH 7 (250 mg·L −1 ), outperforming rhodamine B (30.8 %) and methyl orange (66.4 %), as well as reagent-synthesized MIL-53(Al) Che (91.99 %). Both materials demonstrated exceptional CO 2 capture capacities (4.23 mmol·g −1 for MIL-53(Al)(CFA-PET) vs. 2.37 mmol·g −1 for ZSM-5(CFA) at 273 K/1 bar), attributable to MIL-53′s flexible framework enabling dynamic pore adjustment and ZSM-5′s rigid microporous channels favoring molecular sieving. This work establishes a closed-loop strategy for converting industrial and plastic wastes into functionally differentiated porous materials through element-targeted process design.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Ne Ni,Xiuzhi Gao,Enhui Xing,Yuan Zhu,Jianqiang Liu,Mudi Xin,Ying Ouyang,Yibin Luo,Xingtian Shu
The promotional effects of phosphorous modification on ZSM-5 zeolites by phosphorus oxyacids (H 4 P 2 O 7 , H 3 PO 4 , H 3 PO 3 , and H 3 PO 2 ) with different molecular sizes were investigated with catalytic cracking of n -tetradecane as the probe reaction. It was verified that the diffusion of P precursor molecules into ZSM-5 channels was important to prevent aggregation of P species for better stabilization on tetra-coordinated framework aluminum . Meanwhile, the P–Al interaction was proposed based on results of 27 Al, 31 P, and 29 Si MAS NMR. With H 3 PO 2 as the P precursor, easy diffusion into ZSM-5 channels contributed to less formation of polyphosphates, homogeneous distribution of P species, better reserved crystallinity, microporous area and acidic sites for improving cracking performance of n -tetradecane.
研究领域:
化学工程
·
催化
·
材料科学
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FUEL
·
2025
·
IF 7.5
Xinrui Zhang,Zhiyue Han,Zerui Li,Ziming Yu
Explosion accidents involving high-energy fuel present substantial hazards, underscoring the urgent need for effective safety protection methods. This study employed a hydrothermal method to synthesize nanoscale MgAl-LDHs and innovatively investigated their potential for explosion suppression in the high-energy system composed of RDX/Al. The performance of explosion suppression was evaluated using two novel testing methods capable of controlling the delay time for suppressant release. Experimental results indicate that MgAl-LDHs significantly surpass traditional suppressants, such as NH 4 H 2 PO 4 and NaHCO 3 , in their ability to reduce explosion overpressure and mitigate flames. Furthermore, it was found that reduce the suppressant release delay time is more critical than merely increasing the quantity of the suppressant used. By combining SEM, XPS, GC, and other characterization techniques with quantum chemical theoretical calculations, this study innovatively reveals the explosion suppression mechanism of MgAl-LDHs, elucidating the early decomposition mechanism of RDX and the suppression process of OH in MgAl-LDHs laminates. This research serves as a brand-new example of the application of LDHs materials in explosion suppression, providing novel ideas for future applications in the field.
研究领域:
材料科学
·
安全工程
·
物理化学
·
纳米材料
·
燃烧与爆炸
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2013
·Vol. 13
·期 1
·409-416
·
IF 1.149
Zhang Wei-De,Zheng Yun-Min,Xu Yang-Sen,Yu Yu-Xiang,Shi Qing-Shan,Liu Lihong,Peng Hong,Ouyang Yousheng
In this work, a novel environmental-friendly waterborne polyurethane/ZnAl-layered double hydroxides/ZnO nanoparticles composite (WPU/ZnAl-LDHs/ZnO) was synthesized via in-situ polymerization. ZnAl-LDHs and ZnAl-LDHs/ZnO were synthesized by refluxing in an oil bath. In order to
disperse ZnAl-LDHs/ZnO homogeneously into WPU matrix, ZnAl-LDHs/ZnO was firstly functionalized by isophorone diisocyanate. The incorporated content of ZnAl-LDHs/ZnO in the composite has profound effect on such physical properties as mechanical strength, thermal stability and water swelling.
It is demonstrated that appropriate amount of ZnAl-LDHs/ZnO with good dispersion in the WPU matrix significantly improves the physical performance of the composites. Finally, the antibacterial activity of the composite was tested against G(−) Escherichia coli and G(+) Staphylococcus
aureus. The results indicate that WPU incorporated with ZnAl-LDHs/ZnO shows strong antibacterial activity upon contact.
研究领域:
材料科学
·
生物学
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DOI
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高影响因子
Frontiers of Materials Science
·
2015
·Vol. 9
·期 4
·366-372
·
IF 1
Xia Yu,Ma Liang,Lu Hui,Wang Xian-Ping,Gao Yun-Xia,Liu Wang,Zhuang Zong,Guo Li-Jun,Fang Qian-Feng
Garnet-like Li 6.8 La 3 Zr 1.8 Bi 0.2 O 12 (LLZBO) + x mol.% Al 2 O 3 ( x = 0, 1.25, 2.50) lithium ionic electrolytes were prepared by conventional solid state reaction method under two different sintering temperatures of 1000°C and 1100°C. XPS, induced coupled plasma optical emission spectrometer (ICP-OES), XRD and AC impedance spectroscopy were applied to investigate the bismuth valance, lithium concentration, phase structure and lithium ionic conductivity, respectively. Electrical measurement demonstrated that ionic conductivity of Al-added LLZBO compounds could be obviously improved when the sample sintering temperature increased from 1000°C to 1100°C. The highest ionic conductivity 6.3×10 -5 S/cm was obtained in the LLZBO-1.25%Al sample sintered at 1100°C, in consistent with the lowest activation energy 0.45 eV for the lithium ion migration. The mechanism related with good ionic conductivity in the Al-added LLZBO sample was attributed to the lattice distortion induced by the partial Al substitution at Zr sites, which is helpful to improve the migration ability of Li ions in lattice.
研究领域:
材料科学
·
电化学
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Nanoscale
·
2012
·Vol. 5
·期 4
·1552-1556
·
IF 5.914
Lihua Zhi,Jian Liu,Yuan Wang,Wei Zhang,Baodui Wang,Zhuguo Xu,Zhengyin Yang,Xing Huo,Guangming Li
Fe3O4 nanoparticles (NPs) decorated with rhodamine 6G Schiff base, which exhibit high selectivity and sensitivity toward Al3+ over other common metal ions in aqueous media under a physiological pH window via a 1 : 1 binding mode, have been synthesized and characterized. The resulting conjugate 1c renders the rhodamine 6G Schiff base unit more water soluble, and the detection limit reaches 0.3 ppb in water. Moreover, 1c can detect Al3+ in a wide pH span (5.0–11.0) and enrich/remove excess Al3+ in water via an external magnetic field, which indicates that it has more potential and further practical applications for biology and toxicology. Furthermore, 1c provides good fluorescent imaging of Al3+ in living cells.
研究领域:
分析化学
·
环境科学
·
生物医学工程
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haitao Wang,Chuangyu Guo,Yiruo Ren,Sitong Shen,Zexun Cui,Haozhe Ma,Dandan Han,Hongyan Yao
Metallic Al is an attractive anode material in lithium-ion batteries (LIBs) owing to its relatively high theoretical capacity, low cost, and natural abundance. However, the practical application of Al-based anodes is impeded by issues such as significant volume change, low Coulombic efficiency, growth of dendrites, and sluggish lithium-ion transport during cycling. Herein, we design the inorganic–organic hybrid materials composed of poly(ethylene oxide) (PEO) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) with controllable morphologies and porosity to construct a 3D transport channel and gradient multisite adsorption for Li+ on the Al anode surface. Benefiting from the uniform porous structure and stronger adsorption effect of the PEO–LiTFSI, Li+ is first adsorbed onto PEO–LiTFSI, redistributing Li-ion flux. Second, the adsorbed Li+ and Li+ in LiTFSI undergo an alloying reaction with the Al anode. The two reaction processes redistribute Li-ion flux and ensure more homogeneous transport properties compared to the direct alloying reaction with Al. As a result, the NCM||Al–PEO–LiTFSI cell delivered stable cycling behavior over 500 cycles under a high 1 C cycling rate, achieving a capacity retention rate of 92.8%. The excellent rate performance was also achieved at 222.4 mA h/g at 5 C, indicating the superior practical application prospect of Al-based batteries. The proposed surface modification strategy furnishes a practicable pathway for the construction of highly stable Al anodes, thereby enabling their potential for practical applications.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
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