COMBUSTION AND FLAME
·
2025
·
IF 6.2
Biao He,Saichao Song,Zhiwei Han,Yuanlin Fan,Jingyan Wang,Yaning Li,Jian Li
Aluminum/polytetrafluoroethylene (Al/PTFE) exhibits significant application potential as a high-energy additive in energetic materials. However, its utilization is limited by the native aluminum oxide shell on aluminum surfaces and inefficient mass/heat transfer between Al and PTFE, which substantially impair combustion kinetics and energy release efficiency. To address this, we employed electrostatic spray technology with Nitrocellulose (NC) as a binder to fabricate composite microspheres featuring self-reactive 3D thermal-conductive networks. These microspheres demonstrate enhanced energy release and combustion reactivity. Systematic characterization of Al/PTFE/NC composites through open- and closed-space combustion tests revealed superior energy output characteristics attributed to their internal 3D networks. Compared to physically mixed counterparts, the composites exhibit significantly improved combustion pressure (3.64 ×), pressurization rate (5.91 ×), and combustion velocity (1.61 ×). Furthermore, parametric studies established that 5 wt% NC content and an Al/F ratio of 4:6 yield optimal combustion performance. This work demonstrates that energetic-fiber-constructed 3D networks enhance intra-particle mass/heat transfer, enabling efficient combustion of Al/PTFE composites and providing strategic guidance for their advanced applications.
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DOI
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Yousheng Zhou,Chuanlei Liu,Peicheng Li,Yifan Wang,Qiyue Zhao,Hao Jiang,Qiumin Wu,Benxian Shen,Hui Sun,Xuejiao Han
Olefin oligomerization plays a pivotal role in producing value-added chemicals and functional materials, driving the development of the chemical industry. Acid catalysts are widely utilized in olefin oligomerization, yet precisely controlling acidity remains a significant challenge due to the considerable difficulties in regulating the complex coordination of the active components with the supports. In this study, a series of Al-modified dendritic fibrous nanosilica catalysts (Al-DFNS) were synthesized and applied in the oligomerization of 1-decene to polyalphaolefins (PAOs). Multiple characterizations elucidate that the hydrogen-replaced Al-DFNS (H-Al-DFNS) featured a unique three-dimensional center-radial channel with hierarchical pores, while pulsed-field gradient nuclear magnetic resonance (PFG-NMR) further indicates that the high density of accessible acidic sites and diffusion-limited pore properties lead to much higher catalytic efficiency than diverse siliceous catalysts. Acid distribution measurement and product analysis together reveal that H-Al-DFNS has a well-balanced ratio of Brønsted acid sites (BAS) to Lewis acid sites (LAS). Specifically, high acid strength enhances hydrogen transfer and contributes to high selectivity of trimer and reduced dimer production. Density functional theory (DFT) calculation highlights the crucial role of the stability of carbocation intermediates on acid sites in the oligomerization reaction. The present work provides a reliable strategy for accurately regulated acidity for tunable oligomerization product distribution and initiates the applications of a kind of promising catalytic material in olefin oligomerization.
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Fuping Song,Juping Zhang,Dongfang Li,Tao Zhu,Xing Zhu,Hua Wang
Oxidative dehydrogenation (ODH) of ethylbenzene is a promising process for styrene production. However, its application is limited by product overoxidation and purification requirements due to the co-feeding of mild oxidants. Herein, we report a facile manganese-based catalyst (K/Mn 3 O 4 -Al 2 O 3 ) and achieve competitive styrene selectivity of 88 % and ethylbenzene conversion of 95 % at 450 ℃ (84 % yield vs. ∼ 60 % yield in commercial dehydrogenation process at 600 ℃) under a cyclic redox ODH scheme. The introduction of Al 2 O 3 into MnO x restructures composite oxides and depresses bulk lattice-oxygen migration for the partial oxidation of ethylbenzene. The surface modification using potassium creates reactive sites and regulates surface properties, achieving ethylbenzene activation and high conversions. Highly active lattice oxygen in catalysts after bulk and surface modifications selectively converts ethylbenzene to styrene and water. This study provides an understanding of roles of manganese-based catalysts in styrene generation and offers a strategy to modulate lattice oxygen on catalysts.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Meng Qingling,Hu Xianwei,Kang Hongguang,Lin Ming,Yu Jiangyu,Liu Aimin,Shi Zhongning,Wang Zhaowen
Aluminum coating was expected to be used for corrosion protection of 300M steel. Al coating was prepared using the galvanostatic electrodeposition from AlCl 3 /acetamide (1.3:1) system for the corrosion protection of 300M steel. This process was conducted at varying current density (2–8 mA·cm −2 ) and electrodeposition time (1 and 2 h). The chronopotentiometry revealed that the size of Al nucleus was proportional to the inverse of overpotential. Thus, the morphology of Al coating was characterized by scanning electron microscope and optical surface profiler. The results indicated a decrease in Al grain sizes and the roughness fluctuation with increasing current density. Moreover, the corrosion resistance of Al coatings was evaluated in a 3.5 wt% NaCl solution using the potentiodynamic polarization and electrochemical impedance spectroscopy test. It was illustrated that corrosion current density decreased by 57.8 % at 6 mA·cm −2 with the electrodeposition time increasing from 1 to 2 h, while the value decreased by 75.9 % with the current density raising from 5 to 6 mA·cm −2 for 2 h. Al coating electrodeposited at 6 mA cm −2 for 2 h represented the highest corrosion resistance with the charge transfer resistance of 5695 Ω·cm 2 , while the value of 300M steel was 914 Ω·cm 2 . Finally, X-ray diffraction pattern suggested that corroded coatings compositions included Al 2 O 3 , AlO(OH) and AlCl 3 ·6H 2 O. The study was considered to provide a promising method using AlCl 3 /acetamide to electrodeposit Al coatings for protecting 300M steel from corrosion.
研究领域:
材料科学
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腐蚀工程
·
电化学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 72
·67677-67684
·
IF 3.289
Fuchen Zhang,Hongjun Kang,Yongping Bai,Bo Jiang,Yudong Huang,Li Liu
In this paper, the hydrolysis process of aluminum subacetate (AlSA) was studied by Fourier transform infrared (FT-IR), 27Al nuclear magnetic resonance (NMR), X-ray diffraction (XRD), and particle size distribution analysis, and poly(ethylene terephthalate-co-isophthalate) (PETI) was synthesized by using a compound catalyst made of its hydrolysate, γ-AlOOH, and ethylene glycol stibium (EGSb). Meanwhile, the effects of the γ-AlOOH addition stage on the catalytic effect and the relative properties of the polyester were investigated. The results showed that the Sb and Al compound catalyst had obvious synergistic effects on the process of the polyester polycondensation. With the same dosage of catalyst, the usage of EGSb and the polycondensation time were reduced by 60% and 18.6%, respectively, and the diethylene glycol content in the polyester also decreased by using the compound catalyst, compared with that obtained when only using the EGSb catalyst. The use of γ-AlOOH could play a catalytic role and also shows a unique crosslinking center, which could improve the melting point and glass transition temperature.
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Yaning Li,Jian Li,Boliang Wang,Han Ma,Zhiwei Han
Highly reactive aluminum-fluorine composites with novel structures have attracted much attention in the past decades. However, there is not a specific mechanism to explain the combustion-supporting or inducing effect of F-polymer on aluminum powders . Herein, we present a systematic study of the induced reaction mechanism and propose a new elaboration. Two types of Nano-aluminum/Poly(vinylidene fluoride) (n-Al/PVDF) composites are fabricated via electrospray and mechanical mixing method, respectively. The electrospray sample excites a Pre-Ignition Reaction (PIR) between fluorine and the Al 2 O 3 shell at a low temperature, and simultaneously the specific surface area , surface element state and alumina shell structure of aluminum powders change to some extent. However, the surface structure of the physical mixture does not change significantly in the same temperature range. On this basis, we studied the relationship between the change of surface structure and the enhanced combustion performance of aluminum in electrospray sample. The results show that the combustion-supporting effect of PVDF on aluminum powder should be attributed to the corrosion of the alumina shell and the loose structure of the PIR product.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yuxing Sun,Lei Zhao,Juan Yang,Xiang Wang,Huanjun Peng,Jingdong Peng
Light absorption range, recycling stability and charge transfer efficiency are key to the performance of photocatalytic material. Based on these targets, a Al doped TiO 2 catalyst was synthesized by the evaporation-induced process, after processed by NaBH 4 reduction, the black TiO 2 doped with Al was finally prepared. Uv-vis DRS, EPR and XPS analyses confirm the expanded light absorption window (300 nm - 1000 nm) and the introduction of abundant oxygen vacancy after the reduction process. The final product BTiO 2 /Al-0.5 has a degradation rate of about 84 % over the tetracycline hydrochloride within 60 minutes, the reaction rate constant (k) is 10.6 times higher than the unreduced sample. The dramatic change of photocatalytic ability can be assigned to the broadened visible light absorption , increased charge separation efficiency, narrowed band gap and defect-enriched oxygen vacancy . This work offers insights into the fabrication of TiO 2 catalyst and the introduction of oxygen defect.
研究领域:
材料科学
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光催化
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环境功能材料
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纳米材料
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表面化学
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半导体催化
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 103
·84937-84946
·
IF 3.84
Weiya Huang,Xiang Yu,Dan Li
In this paper, flower-like microspheres of Ni/Al mixed oxide (Ni/Al-CLDH-H), which consist of a hollow core and mesoporous shell, were prepared with the aid of sulfonated polystyrene beads. Thanks to the unique structure, the adsorption performance of the sample toward Congo red (CR) was higher than that of the sample Ni/Al-CLDH-S consisting of a solid core and mesoporous shell, which was prepared in the absence of sulfonated polystyrene beads. The Langmuir, Freundlich, Temkin, Dubinin–Radushkevich, Redlich–Peterson and Sips isotherm models were utilized to describe the adsorption process of Ni/Al-CLDH-H; the Sips model was found to best fit the adsorption data. The adsorption kinetics of CR onto Ni/Al-CLDH-H followed the pseudo-second-order model best, compared with the use of the pseudo-first-order and Elovich models. The thermodynamic study showed that the adsorption process was endothermic and spontaneous in nature. Our newly developed material retained a superior adsorption capacity without a significant loss after a number of adsorption–desorption cycles; indicating its potential as a reusable adsorbent for efficient removal of CR in water.
研究领域:
环境科学
·
材料化学
·
水处理
·
吸附技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Chao Xu,Xuetong Zhao,Lulu Ren,Jianjie Sun,Lijun Yang,Jing Guo,Ruijin Liao
Highly dense CaCu 3 Ti 4 O 12 (CCTO) ceramics co-doped by ZnO and Al 2 O 3 were synthesized by spark plasma sintering (SPS) at 750 °C for 10 min, and then annealed at 1000 °C for 3 h. The homogeneous microstructures were achieved, and the grain size was suppressed to around 2 μm. Dramatically enhanced electrical properties of CCTO ceramics were obtained when 1 mol% ZnO and Al 2 O 3 were co-doped. The breakdown field was improved to 12.13 kV/cm and the nonlinear coefficient was increased to 6.59, accompanying with a low dielectric loss of 0.02 at around 1 kHz, which were ascribed to the elevation of Schottky barrier height from 0.54 eV to 0.80 eV. Comparing with the pure CCTO sample, the activation energy of grain boundary obtained from the impedance spectra increases from 0.64 eV to 0.92 eV. Additionally, the grain and grain boundary resistance were also discussed based on the Cole-Cole plot, from which the grain boundary resistance was found to be increased significantly from 3.8 × 10 5 Ω to 4.0 × 10 6 Ω after co-doping.
研究领域:
材料科学
·
陶瓷
·
电气工程
·
固体物理
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Yongqian Shen,Xineng Zhu,Pengfei Song,Guibin Zhang,Fulong Yang,Pingbo Wang,Fupeng Zhi,Weicheng Ta,Xueyan Du
The rapid advancement of communication technology has heightened concerns over electromagnetic pollution. Developing absorptive materials with dual-loss mechanisms through dielectric and magnetic loss integration offers an effective solution for impedance matching and interference reduction. Herein, Al-based FeCoNiAl multi-principal element solid-solution alloy-decorated carbon nanofibers (FeCoNiAl/CNFs) were synthesized via electrospinning and carbothermal reduction. This system, with a designed molar ratio of 1:1:1:10 (Fe:Co:Ni:Al), strategically leverages the high aluminum content to tailor electromagnetic functionality. The Al matrix actively down-regulates conductivity to optimize impedance matching, while the FeCoNi combination ensures strong and tunable magnetic loss. This design achieves a unique synergy of lightweight character, strong attenuation, and enhanced stability, all underpinned by the formation of a single solid-solution phase, as confirmed by XRD analysis showing three strong diffraction peaks without impurities. At an optimal reduction temperature of 1000 °C, the FeCoNiAl/CNFs composite exhibits a minimum reflection loss (RL min ) of –25.0 dB at 6.08 GHz and an effective absorption bandwidth (EAB) of 2.16 GHz (5.04–7.20 GHz) at a matching thickness of 3.0 mm. The superior performance originates from synergistic dielectric polarization, magnetic resonance, and optimized impedance matching enabled by the tunable Al-based solid-solution alloy. This work provides a novel and rational strategy for designing lightweight, stable, and high-performance microwave absorbers with industrial applicability.
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产品关联
DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Weibin Chen,Yuzhen Wang,Gaochao Liu,Yongsheng Sun,Zhiguo Xia
Laser phosphor display technology plays an important role in advanced display projection; however, it is a challenge in maintaining excellent color accuracy under high brightness due to the lack of red spectrum. Here, red-emitting Mg 2 Al 4 Si 5 O 18 :Eu 2+ ceramics as the phosphor wheel have been optimized in chemical compositions and texture orientation. The textured Mg 2 Al 4 Si 5 O 18 :Eu 2+ ceramics have high transparency and spot limiting ability, accordingly, the ceramic wheel outputs 1184 l m of ultra-bright red light under 50W·mm −2 laser power density. Moreover, the red spectral utilization (＞600 nm) of textured Mg 2 Al 4 Si 5 O 18 :Eu 2+ ceramics is 2.17 times that of traditional Y 3 Al 5 O 12 :Ce 3+ phosphor wheel. The red-emitting textured Mg 2 Al 4 Si 5 O 18 :Eu 2+ cordierite ceramic herein enables an improved light-color saturation experience, and it is potential in the next-generation laser phosphor display applications.
研究领域:
材料科学
·
光电技术
·
显示技术
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DOI
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Pengfei Sun,Juntong Chen,Yuanlin Huang,Jing-Hua Tian,Sha Li,Gulian Wang,Qiaobao Zhang,Zhaowu Tian,Li Zhang
Al-air batteries (AABs) are a great option for outdoor wearable electronics due to their high theoretical energy density (8100 Wh kg −1 ), huge industrial reserves and easy recyclability of Al, but suffer from severe self-corrosion, low Al utilization and harmful liquid leakage. Herein, we first devise a high-strength agarose gel electrolyte (AGE) that combines high toughness and super solution carrying capacity, for the construction of wearable AABs with high energy density, safety, easy assembly and greatly suppressed self-corrosion. The rigid AGEs convert the traditional Al/liquid interface into an Al/quasi-solid interface, thus leading to the formation of a Sn-dominated passivation layer that drastically inhibits the self-corrosion of Al. The in-depth failure mechanism study of AGE-based AAB coin cells demonstrates that three most critical factors affecting the discharge behavior of Al anodes are in order: H 2 accumulation, working current density and OH − replenishment. On this basis, the optimized large-area soft-package AAB (10 cm 2 ) shows a 20.1-hour discharge duration and a specific capacity of 2148.5 mAh g −1 (2766.9 Wh kg −1 ), outperforming those of the state-of-the-art AABs based on other gel electrolytes. More impressively, a practically useful wearable AAB pack is further prepared to drive the LED array and a smart phone.
研究领域:
材料科学
·
能源技术
·
电化学
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DOI
高影响因子
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