COMBUSTION AND FLAME
·
2022
·
IF 5.767
Qianqian He,Jun Wang,Yaofeng Mao,Wei Cao,Jie Chen,Fude Nie
To improve and adjust the combustion and energy output of HMX/Al, graphite fluoride (CF) as oxidizer was introduced in HMX/Al and gradient structured HMX/Al/CF was prepared by additive manufacturing technology . For HMX/Al added with CF, a significantly exothermic peak is observed ranging from 860 to 950 °C due to the reaction of Al and fluorine derived from CF decomposition, and the heat release increases by 106.63% compared to that of HMX/Al. The fourth exothermic heat increases from 161.48 to 955.25 J/g with the increased Al content from 10 to 30 wt%. Moreover, the combustion rate and pressure output of HMX/Al have been improved by introducing CF. For HMX/Al added with CF, the combustion time decreases from 10.3 to 2.5 s, which is dependent on the Al content from 10 to 30 wt%. And the highest peak pressure is 1712.2 kPa when Al content is 20 wt% in HMX/Al/CF composites. Furthermore, gradient structured HMX/Al/CF consisting of three layers with Al content of 10, 20 and 30 wt% was prepared to improve combustion and pressure output. The combustion rate and peak pressure of gradient structured HMX/Al/CF are higher than those of single structured HMX/Al/CF. The highest peak pressure (∼2.24 MPa) is obtained when the Al content of the middle layer and outer layer is 30 wt% and 20 wt% in the gradient structured HMX/Al/CF cylinder, respectively. Finally, the reaction intermediates and combustion reaction products were fully characterized to understand the enhanced effect of CF in HMX/Al. This work provides a promoting way to improve and regulate the combustion reaction performance and pressure output of HMX/Al.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiangya Ma,Rui Zhang,Wei Xia,Yanli Kong,Yong Nie,Yahua Zhou,Chi Zhang
A novel covalently bonded composite coagulant CAFM was synthesized by using inorganic PAFC and organic CPAM through UV initiation. The algae and turbidity removal efficiency were investigated by using CAFM in algae-laden water coagulation process. The Al/Fe residual and algae flocs size were also examined. Results showed that 96% chlorophyll a and 87% turbidity were removed by using CAFM at dosage of 40 mg/L. The removal efficiency was larger than that by using PAFC or CPAM at their optimal dosage. The minimum Al residual of 12.47 μg/L, Fe residual of 9.64 μg/L together with the most compact algae flocs were achieved by using CAFM 0.6 , which was great favorable and essential for drinking water treatment . Finally, the charge neutralization of PAFC and bridging of CPAM synergetic contributed to algae harvesting.
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Nanomaterials
·
2021
·Vol. 11
·期 12
·3366
·
IF 5.076
Xiaohang Ma,Wanjun Zhao,Wei Le,Jianxin Li,Pengwan Chen,Qingjie Jiao
In this study, we studied the synergetic effect of potassium oxysalts on combustion and ignition of nano aluminum (Al) and nano copper oxide (CuO) composites. Potassium periodate (KIO4) and potassium perchlorate (KClO4) are good oxidizers with high oxygen content and strong oxidizability. Different contents of KIO4and KClO4were added to nano Al/CuO and the composites were assembled by sonication. When the peak pressure of nano Al/CuO was increased ~5–13 times, the pressurization rate was improved by ~1–3 orders of magnitude, the ignition delay time was shortened by ~0.08 ms–0.52 ms and the reaction completeness was adjustable when 30–70% KIO4and KClO4were added into the composites. The reaction of Al/KIO4and Al/KClO4at a lower temperature was helpful to ignite the ternary composite. Meanwhile, CuO significantly reduced the peak temperature of oxygen released from the decomposition of KIO4and KClO4. The synergetic effect of binary oxidizers made the combustion performance of the ternary composites better than that of the binary composites. The present work indicates that KIO4and KClO4are promising additives for nano Al/CuO to tune and promote the combustion performance. The ternary composites have potential application in energy devices and combustion apparatus.Keywords:potassium oxysalts;synergetic effect;combustion performance;copper oxide;reactivity;ignition
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Xin Yu,Jielin Huang,Jiawei Zhao,Chao Zhou,Changhui Xin,Quanhui Guo
Poriferous monocrystal-like nanostructures are contributing to fabricate long-distance charge transfer pathways and rapid diffusions of the degraded products, and attracts wide attentions. In this work, layered and poriferous (Al,C)–Ta 2 O 5 mesocrystals were fabricated by topotactic transformation strategy with Ta 4 AlC 3 MAX as starting materials for visible-light photocatalytic antibiotic degradation. The prepared sample exhibited enhanced visible-light absorption and visible-light photocatalytic performance, far superior to those of commercial Ta 2 O 5 and Ta 4 AlC 3 MAX, which was mainly because of the elemental doping in the samples. The experimental results also indicated that continuous attacks of the photo-generated holes and ·O 2 − species efficiently induced efficient visible-light photodegradation of tetracycline . Current work also indicates a new and potential tantalum-based semiconductors for high-performance environmental photocatalysis .
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PubMed
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Small Methods
·
2021
·Vol. 5
·期 9
·2100491
·
IF 14.188
Wending Pan,Jianjun Mao,Yifei Wang,Xiaolong Zhao,Kee Wah Leong,Shijing Luo,Yue Chen,Dennis Y. C. Leung
Aqueous Al–ion battery (AAIB) is regarded as a promising candidate for large-scale energy storage systems due to its high capacity, high safety, and low cost, with MnO 2 proved to be a high-performance cathode. However, the potential commercial application of this type of battery is plagued by the frequent structural collapse of MnO 2 . Herein, an in situ, electrochemically reformed, urchin-like Al x MnO 2 cathode is developed for water-in-salt electrolyte-based AAIBs. Benefiting from its unique α-MnO 2 coated Mn 2 AlO 4 structure, a high Al ion storage capacity is achieved together with a high discharge voltage plateau of 1.9 V by reversible MnO 2 electrolysis. Consequently, the battery exhibits a high specific capacity of 285 mAh g –1 and a high energy density of 370 Wh kg –1 at a high current density of 500 mA g –1 . Improved stability with record capacity retention is also obtained at an ultrahigh current density of 5 A g –1 after 500 cycles. Such a high-capacity and high-stability Al x MnO 2 cathode would pave the way for in situ electrochemical transformation of cathode design and thus boost the practical application of AAIBs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Jinrui Guo,Jing Tian,Jinhua Deng,Xinyu Yang,Binghui Duan,Yong Liu
Electrochemical reduction and photocatalytic reduction of CO 2 have attracted more and more attention, but they also face the problem of low utilization efficiency of electricity and solar energy. In this study, a new strategy of applying a novel Al–Sn-CNTs composite in electrochemical corrosion process was proposed to reduce CO 2 without additional electricity and light. In the Al–Sn-CNTs/CO 2 system, micro galvanic cell with Al as anode and Sn or CNTs as cathode was formed, and CO 2 was reduced to formic acid on the cathode surface . The cumulative formic acid concentration of the Al–Sn-CNTs/CO 2 system achieved 21.18 mg/L within 60 min under the conditions of initial pH 9.0, Cl − concentration 10 mmol/L, and Al–Sn-CNTs composite dosage 2 g/L. Based on the morphology, crystal structure and electrochemical test results of the Al–Sn-CNTs composite, a possible mechanism of CO 2 reduction to formic acid in the Al–Sn-CNTs/CO 2 system was proposed.
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ACS Omega
·
2021
·
IF 3.512
Mingyu Zhang,Chaoyong Wang,Junkai Zhang,Gang Li,Li Gu
LiNi0.8Co0.1Mn0.1O2 (NCM811) became a research hot point because of its low cost, environmental friendliness, and excellent electrochemical performance. However, Li+/Ni2+ intermixing is an essential factor affecting its applicability. Doping could be an important method to improve the electrochemical performance of NCM811-based cathode materials. In this work, La and Al co-doped NCM811 was prepared by a solid-state method. Results from X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) and electrochemical performance were discussed in depth. These showed that when La and Al doping concentrations were 1 and 0.5%, the samples showed the best performance. The as-improved performances were mainly attributed to the reduced Li+/Ni2+ intermixing, suppressed phase transition, and decreased potential polarization and impedance.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 14
·3473-3481
·
IF 6.569
Mili Liu,Hui Liu,Kang Chen,Jiangyong Sun,Hui Wang,Jiangwen Liu,Liuzhang Ouyang
The potential of a multiphase Al–Li alloy with the unreported Al1.08Li1.92 phase for use as a hydrolytic material to produce hydrogen was studied. This alloy enabled rapid hydrogen release in a wide temperature range with robust hydrogen yield. It could produce 1496 ml H2 per g within merely 0.5 min at 299 K and release 1076 ml H2 per g in 0.5 min even at a subzero temperature of 243 K. The hydrogen production kinetics were confirmed with a chemical step and could be well controlled by tailoring the solution components of water/ethanol mixtures. Furthermore, the alloy showed good air-resistance ability, indicating its suitability for safe handling and transport in practical applications. Our results confirmed the excellent hydrogen production achieved using this Al-based generation system. It might shed light on the progress of hydrogen production technologies for commercial use.
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ADVANCED ENGINEERING MATERIALS
·
2021
·Vol. 23
·期 5
·2001252
·
IF 3.862
Dawei Zheng,Tianwei Huang,Bing Xu,Xu Zhou,Yaofeng Mao,Lin Zhong,Bing Gao,Dunju Wang
The development of 3D printing technology provides a new idea for the application of energy-containing materials as functional reactive materials, which helps Al–F high-energy materials to achieve customized performance and structure, so that energy transmit can be targeted. A high fuel-load ink (up to 90 wt%) based on Al-polytetrafluoroethylene (PTFE) is designed and fabricated using fluororubber (FR) as a binder. The content of FR is directly related to the mechanical properties of ink, and the customized structure from the uniform and stable deposition can be obtained by adjusting the content of FR (10–20 wt%). Under the display of high-speed photography, the ink shows a strong stability in combustion performance, which is conducive to realize the performance customization of the ink in the application. To better understand the combustion mechanism, the thermal properties and combustion process are analyzed in brief through thermal analysis and the combustion snapshots.
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RSC Advances
·
2021
·Vol. 11
·期 4
·2397-2404
·
IF 3.361
Jing Chen,Yali Xu,Shuying Li,Fanghong Xu,Qian Zhang
Tetracycline detection has been a great concern because of its overuse and difficulty in degrading. Here, a detection method with ratio fluorescence was developed by synthesizing Eu3+ doped nanocomposites with NH2-MIL-53(Al) nanosheets. After adding tetracycline, the fluorescence intensity at 616 nm characteristic emission peak of Eu3+ was sensitized by the antenna effect generated from coordinating Eu3+ with tetracycline, but the fluorescence of NH2-MIL-53(Al) at 433 nm was quenched by the fluorescence resonance energy transfer between the Eu3+-tetracycline composition and NH2-MIL-53(Al). Therefore, the efficient detection of tetracycline was achieved based on this change of ratio fluorescence signal. The experimental results show that Eu3+/NH2-MIL-53(Al) has excellent selectivity, a wider linear range and a lower detection limit for detecting tetracycline. This method can afford favorable ideas for developing advanced chemical and biological sensors.
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SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Zhibin Zhang,Fengxin Xue,Wenxia Bai,Xueting Shi,Yanhua Liu,Libang Feng
In order to improve the durability and stability of artificial superhydrophobic materials, the superhydrophobic surface with excellent self-healing performance on aluminum alloy is prepared by an environment-friendly method with boiling water treatment and PDA@HDTMS nanocapsule deposition. The as-prepared superhydrophobic aluminum alloy surfaces exhibit outstanding durability and stability when subjected to a variety of circumstances. Meanwhile, the superhydrophobic aluminum alloy is endowed with excellent self-cleaning performance and corrosion resistance . The robust durability and stability as well as outstanding self-cleaning and corrosion resistance are quite favourable to the practical application. More importantly, the as-prepared superhydrophobic surfaces take on superior self-healing performance, and it provides a novel idea to improve the durability of superhydrophobic materials from another vision.
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ANALYTICAL LETTERS
·
2020
·
IF 1.467
Meijuan Ren,Huan Wang,Yuanyuan Liu,Qin Ma,Wenjing Jia,Mingzhu Liu,Huiju Wang,Yongchang Lu
Amino-MIL-53(Al) nanosheets were synthesized by a hydrothermal reaction and were employed as a fluorescent probe because of their high quantum yield and excellent stability. The amino-MIL-53(Al) nanosheets have a maximum fluorescence emission peak at 435 nm using an excitation wavelength of 335 nm. The fluorescent intensity of luminophor at 435 nm was linearly quenched when mercury (II) (Hg2+) was added, which occurred due to the adsorption of Hg2+ onto the luminophor surface. Under these conditions, the fluorescent signal of the system is in the “turn-off” state. Following the addition of glutathione (GSH) into the system, the quenched fluorescence intensity may be partially restored based on the reaction between glutathione and Hg2+. In this condition, the fluorescent signal of the amino-MIL-53(Al)-Hg2+ system is in the “turn-on” state. Therefore, the amino-MIL-53(Al) nanosheets were successfully used as a “turn-off-on” fluorescent sensing system to determine the concentrations of Hg2+ in Tibetan medicine and glutathione in rabbit serum. A good correlation coefficient was obtained between the quenching of the fluorescence intensity of luminophor and the concentration of Hg2+ using the optimized conditions. A linear range was acquired from 1.96 nM to 38.27 μM with a detection limit of 0.23 nM of Hg2+ based upon a signal-to-noise ratio of three. For glutathione, the linear dynamic range was from 210 nM to 15.25 μM with a detection limit equal to 8.11 nM based upon a signal-to-noise ratio of three. This developed sensor system has the advantages of high selectivity, favorable sensitivity and simple operation for the determination of Hg2+ and glutathione in real samples.
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