Crystals
·
2025
·Vol. 15
·期 6
·563
·
IF 2.4
Jinyi Wang,Bowen Fan,Jincheng Yu,Mengqiong Huang,Jiana Song,Zhaokun Yang,Yuan Ji
Single-phase ternary Mn-Cu-Al alloy ribbons were fabricated by melt-spinning a Mn48Cu28Al24ingot on a rotating copper roller. They were used as dealloying precursor for forming the nanoporous structure in HCl solution. The basic dealloying behavior was examined by controlling the dealloying time from 5 min to 180 min at 50 °C. Due to the active chemical property, Mn and Al elements are easily etched in acid solutions. Meanwhile, Cu elements retained and rearranged. A three-dimensional bicontinous nanoporous structure was fabricated, with a ligament size of 55 nm~100 nm and pore size of 35 nm~85 nm. The porosity evolution of dealloyed MnCuAl alloy was divided into three stages. First, the dissolution of Mn and Al is so significant that formation of pores is dominant. Stage two, the rapid growth of both ligament size and pore size. The ligament/pore ratio is nearly unchanged. The last stage is ligament coarsening. Moreover, the electrocatalytic activity for glucose oxidation of dealloyed samples is examined. The 40 min dealloyed MnCuAl ribbon exhibited the highest sensitivity and relatively maximum current density.
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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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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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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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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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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
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
·
光催化
·
环境功能材料
·
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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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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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
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陶瓷
·
电气工程
·
固体物理
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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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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Bihong Li,Yijie Ding,Weizhong Zheng,Weizhen Sun,Ling Zhao
Zeolites have emerged as the highly potential solid catalysts in isobutane (C4) alkylation due to their adjustable acidity and structural properties. The introduction of rare earth metal or transition metal can effectively regulate the acidic site distribution and strength of beta zeolite. The structural stability, acid properties and catalytic performance of low Si/Al ratio beta zeolites functionalized with various lanthanum and copper loadings are systematically investigated for the C4 alkylation through experimental characterization and catalytic evaluation. It is revealed that the optimal metal loading can impart superior acidic properties to beta zeolites. Lanthanum modification increases the total amount of Brønsted acid sites (BAS), and enhances the population of moderate and strong BAS compared to copper modification. Catalytic evaluation demonstrated that copper-modified beta zeolites achieve a higher research octane number (RON) up to 93 for alkylate, but exhibit a shorter catalyst lifetime. Lanthanide-modified counterparts exhibit a catalytic lifetime of 320 min and 65 wt% trimethylpentane (TMPs) selectivity with relatively stable RON of 90 during a prolonged stable operation, and meanwhile, the optimal lanthanide-modified HB-1 zeolites (0.35 wt% La@HB-1) demonstrate high level of catalytic lifetime and TMPs selectivity after three cycle experiment. The information obtained from this work will contribute to a better understanding of the metal-modified low-Si/Al-ratio beta zeolites for catalyzing the C4 alkylation.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Junhao Cao,Zekun Wang,Xinyu Ma,Xiaohong Liu,Guilin Feng,Wei Xiang
O3-type NaNi 2/9 Fe 1/3 Cu 1/9 Mn 1/3 O 2 is considered a promising layered oxide cathode for sodium-ion batteries, owing to its high operating voltage and cost-effective elemental composition. However, its practical application is hindered by irreversible phase transitions at high voltages, which severely compromise structural integrity and cycling stability during prolonged operation. To address these challenges, elemental doping has emerged as an effective strategy to modulate crystal lattice parameters and suppress detrimental phase evolution. In this study, we propose a multi-element (Li/Mn/Al) doping approach, synthesized via a hydroxide-precursor-assisted sodiation process, to enhance the structural robustness and electrochemical performance of O3-type NaNi 2/9 Fe 1/3 Cu 1/9 Mn 1/3 O 2 . Specifically, Aluminum doping serves as a structural pillar to stabilize the transition metal-oxygen (TM-O) framework, effectively mitigating layer gliding. Meanwhile, Li doping activates the Fe 3+ /Fe 4+ redox couple, enabling charge compensation and enhancing reversible capacity. Benefiting from the synergistic effects of Li/Mn/Al co-doping, the resulting Na(Ni 2/9 Fe 1/3 Cu 1/9 Mn 1/3 ) 0.96 Mn 0.02 Al 0.01 Li 0.01 O 2 cathode demonstrates suppressed Jahn-Teller distortion, improved air stability, and superior cycling performance. Notably, a reduced interlayer distance ratio ( d (O Na-O) / d (O-TM-O) ) correlates with delayed O3-to-P3 phase transformation and enhanced lattice stability, as confirmed by crystallographic analyses. The synergistic effects of Li/Mn/Al co-doping not only stabilize the host structure but also unlock cationic redox reversibility, offering a pathway to balance energy density and longevity in sodium-based cathodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Zeng Chen,Shengjun Li,Wei Li,Yumin Wang,Chunli Diao,Xiyang Jia,Qingqing Pei,Sihan Wang,Dawei Zhang,Weifeng Zhang
The preparation of suitable SiC fiber (SiC f )/Al precursors is crucial for the fabrication of SiC f -strengthened Al alloys . In this work, a SiC f /Al precursor was prepared by pulse current deposition in a molten LiCl–KCl–AlCl 3 melt. The electrochemical deposition of Al 3+ was separately investigated on the Mo wire, Cu wire, SiC f , and Cu-coated SiC f electrodes. The intermediate Cu layer can eliminate the Li generated by the underpotential deposition on the carbon layer outside SiC f . In addition, open circuit chronopotentiometry was performed to confirm the reduction processes of Al 3+ on the Cu wire and Cu-coated SiC f , and the results indicate that Al 3+ exhibits similar reduction processes on the two electrodes. The deposited Al layer possibly formed Al–Cu alloys with the intermediate Cu layer on SiC f , which was beneficial to the connection between the Al layer and SiC f substrate. Scanning electron microscopy was employed to investigate the morphology and microstructure of the prepared SiC f /Al fiber. After the pulse current was optimized, a compact and even layer of Al was deposited on SiC f .
研究领域:
材料科学
·
金属基复合材料
·
电化学
·
冶金工程
·
纳米材料制备
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高影响因子
危险品化学品经营许可证（带存储）