Nanomaterials
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2022
·Vol. 12
·期 4
·635
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IF 5.719
Mi Zhang,Hui Ren,Qingzhong Cui,Hanjian Li,Yongjin Chen
In order to improve thermal conductivity, energy performance, and combustion performance of the aluminum-containing thermite, nanocarbon materials were added to thermite. Aluminum/molybdenum and trioxide/nanocarbon materials (Al/MoO3/NCM) were fabricated by electrostatic spinning technology. The Al and MoO3particles of the nAl/MoO3/NCM thermite are much smaller than nitrocellulose (NC); thus, the two components can be better attached to NC fibers. Results on thermal conductivity demonstrated that the addition of NCM can improve the thermal conductivity of Al/MoO3, and the addition of reduced graphene oxide (RGO) has a more significant impact on thermal conductivity. Energy performance analysis results indicated that the energy performance of Al/MoO3/NCM thermite spinning is the best when the value of combustion oxygen equivalent ratio (Φ) is 0.90–1.00. The combustion performance results show that the addition of NCM can significantly increase the combustion rate of thermites, and the addition of RGO improves its combustion rate the most, followed by carbon nanotubes (CNT) and nanoflake graphite (NFG) being the lowest. By changing the shape of the Al/MoO3/NCM charge and the internal composition of the charge, the sensitivity of the agent can be adjusted, and the matching performance and use performance of the electric igniter can be improved.Keywords:Al/MoO3/NCM;electrostatic spinning;thermal conductivity;energy performance;combustion performance
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COMBUSTION AND FLAME
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2022
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IF 5.767
Lyu Jie-Yao,Yang Su-Lan,Wu Shixi,Tang Gen,Yang Wenming,Yan Qi-Long
Burning rate modulation is a critical but challenging technology for solid propellants’ design. Great efforts have been made to synthesize and utilize catalysts to modify the pressure exponent ( n ), but poor catalytic efficiency and lower energy level of conventional catalysts limit their further applications. In this research, interfacial control of Al@AP together with precise catalysis of CuO is represented for the purpose of pressure exponent reduction and combustion performance improvement. The core-shell structured Al@AP and Al@AP/CuO composites were prepared and applied into HTPB/Al/AP composite propellants. These prepared propellants have the same formula but different micro-structures of ingredients, leading to varied combustion performance, in terms of the burning rates, combustion wave structures, flame spectra, agglomeration processes of Al particles and condensed combustion products . The investigation results show that by using interfacial control of Al@AP and precise catalysis of CuO, the n of involved propellants over 1–4 MPa can be greatly decreased from 0.42 to 0.21 and the agglomeration of Al could be effectively inhibited. In addition, propellants based on Al@AP and Al@AP/CuO interfacial controls of this research are summarized and compared together with those based on Al@RDX published recently, to present overall characteristics of interfacial control techniques, which could lead to the development of new smart controllable propellants.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yang Yu,Xiaoping Cai,Xinyang Jiao,Chengyi Xu,Jinan Niu,Peizhong Feng
Ni-Al-Cr intermetallic compounds are candidate at extreme environment due to their excellent oxidation resistance at high temperature, and the oxidation resistance of Ni-Al-Cr alloy system has been studied extensively. However, the research on oxidation resistance mechanism of porous Ni-Al-Cr intermetallic compounds is still not deep. In our work, porous Ni-Al-Cr intermetallic compounds were synthesized by thermal explosion, and the oxidation resistance of porous Ni-Al-Cr system was mainly investigated. The results indicate that Cr promotes the formation of highly protective continuous Al 2 O 3 layer, increasing the oxidation resistance at 900 °C of porous Ni-Al-Cr. After oxidation at 900 °C for 120 h, the minimum mass gain of Ni-Al-Cr products is only 6.96%.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Yu Wang,Yunlei Shi,Dazhen Xiong,Zhiyong Li,Huiyong Wang,Xiaopeng Xuan,Jianji Wang
Ammonia (NH 3 ) is produced from nitrogen (N 2 ) and hydrogen (H 2 ) by the Harber-Bosch process at high pressure and high temperature. Due to the reversibility and low conversion efficiency of the reaction, the product contains a large amount of raw gas, which seriously affects the production efficiency of ammonia. Therefore, it is essential to exploit high-performance adsorbents for separating NH 3 from NH 3 /N 2 /H 2 mixtures. Herein, we designed and synthesized a kind of metal–organic framework (MOF) composites by anchoring metal chloride (NiCl 2 , CoCl 2 , or SnCl 2 ) on the bipyridinium groups in the MOF-253(Al) pores. It is found that the optimal composite shows an NH 3 uptake capacity of 18.0 mmol/g at 25.0 °C and 1.0 bar, which is 3.33 times that of the pristine MOF-253(Al), and the composite exhibits a much faster adsorption kinetics of NH 3 than the pristine MOF-253(Al). Significantly, the excellent NH 3 uptake capacity at low pressure allows selective trapping of NH 3 from NH 3 /N 2 /H 2 at 25.0 °C with the selectivity coefficients of 5708 to N 2 and 2320 to H 2 . Spectral measurements reveal that the synergistic action of NH 3 coordination to the metal in the MOF and the hydrogen bonding of NH 3 with both O atoms of the carboxyl groups and Cl − of the guest molecules account for such an excellent capture and selectivity. In general, the strategy developed here is simple and effective for improving the selectivity of NH 3 separation, which opens a new way for the design of high-performance solid adsorbents.
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Defence Technology
·
2023
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IF 5.1
Jian Wang,Jie Chen,Yaofeng Mao,Yongjun Deng,Wei Cao,Fude Nie,Jun Wang
Metal (aluminum and boron) based energetic materials have been wildly applied in various fields including aerospace, explosives and micro-devices due to their high energy density. Unfortunately, the low combustion efficiency and reactivity of metal fuels, especially boron (B), severely limit their practical applications. Herein, multi-component 3D microspheres of HMX/B/Al/PTFE (HBA) have been designed and successfully prepared by emulsion and solvent evaporation method to achieve superior energy and combustion reactivity. The reactivity and energy output of HBA are systematically measured by ignition-burning test, constant-volume explosion vessel system and bomb calorimetry. Due to the increased interfacial contact and reaction area, HBA shows higher flame propagation rate, faster pressurization rate and larger combustion heat of 29.95 cm/s, 1077 kPa/s, and 6164.43 J/g, which is 1.5 times, 3.5 times, and 1.03 times of the physical mixed counterpart (HBA-P). Meanwhile, HBA also shows enhanced energy output and reactivity than 3D microspheres of HMX/B/PTFE (HB) resulting from the high reactivity of Al. The reaction mechanism of 3D microspheres is comprehensively investigated through combustion emission spectral and thermal analysis (TG-DSC-MS). The superior reactivity and energy of HBA originate from the surface etching of fluorine to the inert shell (Al 2 O 3 and B 2 O 3 ) and the initiation effect of Al to B. This work offers a promising approach to design and prepare high-performance energetic materials for the practical applications.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2023
·Vol. 27
·期 9
·2499-2507
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IF 2.5
Wu Jiani,Lu Yan,Wu Huacheng,Luo Qian,Bai Zhe,Li Jun
All solid-state lithium batteries have been widely used in mobile communications and electric vehicles due to their high energy density, wide operating voltage, and long cycle life. However, solid-state electrolytes have shortcomings such as insufficient stability and low conductivity. In this study, the sol–gel method prepared the solid electrolyte Li 6.25 Al 0.25 La 3 Zr 2 Ti 0.25 O 12 co-doped with Al and Ti. The influence of Al and Ti on the structure and conductivity of Li 7 La 3 Zr 2 O 12 was investigated by X-ray diffraction, impedance spectroscopy, scanning electron microscopy, and inductively coupled plasma spectrometer (ICP). With optimal additions of Al and optimal additions of Ti, Li 6.25 Al 0.25 La 3 Zr 1.75 Ti 0.25 O 12 electrolyte calcined at 900 °C for only 6 h showed an ionic conductivity of 1.51 × 10 −4 S/cm at room temperature. Li/Li 6.25 Al 0.25 La 3 Zr 1.75 Ti 0.25 O 12 /LiFePO 4 all solid-state battery was assembled. The initial charge and discharge capacity of the lithium-ion phosphate positive electrode at 10 μA/cm 2 was 165.1 mAh/g and 130.1 mAh/g at room temperature. The initial coulomb efficiency was 78.9%. After 100 cycles, the discharge capacity was 149.1 mAh/g, and the capacity retention rate was 99.8% at room temperature.
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APPLIED CATALYSIS A-GENERAL
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2021
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IF 5.706
Yankai Liu,Ruinian Zhou,Jianyu Qu,Feng Han,Shuai Zhang,Xingliang Xu
Upgrading carbon dioxide (CO 2 ) into valuable products is a highly promising strategy of artificial carbon cycle. In this study, a series of in situ reduced CuMgAl layered double hydroxides (R-CuMgAl-LDHs) composites were synthesized, in which Cu nanoparticles were effectively dispersed and anchored on MgAl-LDHs with formation of Cu + and Cu 0 species. The optimized R-Cu 1.5 Mg 1.5 Al 1 -LDH exhibited excellent catalytic performance for the carboxylative cyclization of 2-methyl-3-butyn-2-ol with CO 2 (turnover number of 243) under mild conditions. The layered structure of LDH stabilized the active Cu species with high dispersion, enhancing the catalytic efficiency of this carboxylative cyclization reaction. Simultaneously, the dual-activation of both CO 2 and propargylic alcohol by Cu 0 /Cu + species generated on the surface of LDH contributed significantly to the catalytic efficiency enhancement. Furthermore, R-Cu 1.5 Mg 1.5 Al 1 -LDH catalyzed the reaction of a wide range of terminal or internal propargyl alcohols with CO 2 , yielding various functionalized α-alkylene cyclic carbonates. Finally, a reasonable reaction mechanism was put forward according to the comprehensive analysis.
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JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Yue Ma,Songqi Cheng,Xiaodong Wu,Tongxi Ma,Liping Liu,Baofang Jin,Minghan Liu,Jianbo Liu,Rui Ran,Zhichun Si,Duan Weng
To improve the hydrothermal durability of Cu-SSZ-13 selective catalytic reduction (SCR) catalyst, a thin Al 2 O 3 modification layer was coated on the external surface of Cu-SSZ-13 by a chemical liquid deposition (CLD) method. The high-temperature SCR activity of the Al-modified Cu-SSZ-13 can be maintained upon 750–800 °C hydrothermal aging, and over-oxidation of NH 3 is largely inhibited. Based on H 2 -TPR and EPR results, it is revealed that CuAl 2 O 4 -like species forms upon Al modification and converts further to CuAlO 2 -like species during aging, while the accumulation of CuO-like species is inhibited. The high affinity of Al-containing species ( i.e. , Al 2 O 3 and CuAl 2 O 4 -like species) with Cu(OH) 2 is suggested by DFT calculations, indicating that Cu(OH) 2 detached from ion-exchange sites are captured by Al to form CuAlO 2 -like species instead of CuO-like species. The passivation of detached Cu species by coated Al leads to somewhat weakened low-temperature SCR activity, but successfully preserves the high-temperature SCR performance upon aging, which can be applied to high-temperature SCR scenarios.
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Energy Storage Materials
·
2023
·
IF 20.4
Tian Xu,Long Yao,Guanglin Xia,Xuebin Yu
Rechargeable Al-ion batteries (AIBs) with high capacity and Earth-abundant metal resources are gaining attention. However, the anode side of AIBs has been overlooked, with most using pure Al foil as the anode. In this study, a simple brush painting technique using eutectic Ga-In (EGaIn) liquid metal (LM) creates a high-performance AIBs anode. The EGaIn@Mo anode allows uniform and reversible plating/stripping of Al for over 10,000 h at 10 mAh cm −2 with 99.6 % average Coulombic efficiency. It enables half-cell operation at an ultrahigh areal capacity of 50 mAh cm −2 for over 1200 h. A full cell with EGaIn@Mo anode and graphite cathode maintains a reversible capacity of 82.8 mAh g −1 after approximately 6000 cycles at a high rate of 2 A g −2 , exhibiting an ultralow capacity fading rate of 0.00064 % per cycle. Moreover, an anode-free cell lasts over 800 cycles with a specific capacity of 75.9 mAh g −1 . This work demonstrates the potential of EGaIn LM coating for high-capacity AIBs and LM anode application.
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APPLIED ORGANOMETALLIC CHEMISTRY
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2023
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IF 3.9
Yongzhao Zhang,Xuzheng Chen,Zhenya Zhu,Luping Lv
5-hydroxymethylfurfural (5-HMF) has been considered as an important biomass-based platform chemical for its wide applications. Currently, the production of 5-HMF from the catalytic dehydration of glucose is preferred, in which the Brønsted and Lewis acids in catalysts play an important role. Here, it was found that MIL-53(Al) modified with tin was an active, selective, and reusable catalyst for the transformation of glucose to 5-HMF in dimethyl sulfoxide (DMSO) solvent. Around 42.3% yield of 5-HMF with 93% glucose conversion was achieved, when the prepared metal-organic frameworks (MOFs) was used as the catalyst, showing superior catalytic performance compared with most of other MOFs. Moreover, the catalyst possessed inert catalytic properties in water with almost no any influence on the conversion of glucose, suggesting a compelling opportunity to act as a support material.
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Arabian Journal of Chemistry
·
2023
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IF 6
Fulong Cheng,Yinian Wang,Yuting Fan,Dan Huang,Jie Pan,Wei Li
Biochar-based adsorbents for phosphate removal from wastewater has gained increasing attention and achieved significant progress. However, there is still much room for the enhancement on adsorption performance in terms of removal rate, adsorption capacity and pH application range. Herein, novel Ca-Al-La modified biochar adsorbents in this study were synthesized for enhancing phosphate adsorption in wastewater. The synthesis parameters of adsorbents were optimized by using the response surface methodology (RSM). The Ca-Al-La modified biochar adsorbent synthesized under the optimal conditions (CAL-MBC) exhibited superior adsorption capability towards phosphate. Specifically, CAL-MBC achieved a rapid removal rate to reach the adsorption equilibrium within 1 h, a maximum phosphate adsorption capacity of 152.9 mg/g, and excellent pH stability within a broad pH range of 3.0–11.0. The adsorption mechanisms involving electrostatic interaction, precipitation and inner-sphere complexation via ligand exchange were responsible for the excellent adsorption performance of phosphate on CAL-MBC. This study verifies CAL-MBC as a promising metal modified biochar adsorbent to enhance phosphate removal from wastewater.
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FOOD CHEMISTRY
·
2023
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IF 8.8
Fangfang Huang,Qingfei Dai,Kewei Zheng,Qingbao Ma,Yu Liu,Shuoqi Jiang,Wei Jiang,Xiaojun Yan
The effective modulation of pancreatic lipase and cholesterol esterase activities proves critical in maintaining circulatory triglycerides and cholesterol levels within physiological boundaries. In this study, peptides derived from KPHs-AL, produced through the enzymatic hydrolysis of skipjack tuna dark muscle using alkaline protease, have a specific inhibitory effect on pancreatic lipase and cholesterol esterase. It is hypothesized that these peptides target and modulate the activities of enzymes by inducing conformational changes within their binding pockets, potentially impacting the catalytic functions of both pancreatic lipase and cholesterol esterase. Results revealed these peptides including AINDPFIDL, FLGM, GLLF and WGPL, were found to nestle into the binding site groove of pancreatic lipase and cholesterol esterase. Among these, GLLF stood out, demonstrating potent inhibition with IC 50 values of 0.1891 mg/mL and 0.2534 mg/mL for pancreatic lipase and cholesterol esterase, respectively. The kinetics studies suggested that GLLF competed effectively with substrates for the enzyme active sites. Spectroscopic analyses, including ultraviolet–visible, fluorescence quenching, and circular dichroism, indicated that GLLF binding induced conformational changes within the enzymes, likely through hydrogen bond formation and hydrophobic interactions, thereby increasing structural flexibility. Molecular docking and molecular dynamics simulations supported these findings, showing GLLF's stable interaction with vital active site residues. These findings position GLLF as a potent inhibitor of key digestive enzymes, offering insights into its role in regulating lipid metabolism and highlighting its potential as functional ingredient.
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