MATERIALS RESEARCH INNOVATIONS
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2023
·
IF 0
Qiong Yao,Shouwu Yu
A triazine long chain charring agent (TCA) was synthesised using cyanuric chloride, morpholine and anhydrous piperazine. The synthesised TCA was compounded with ammonium polyphosphate (APP) to obtain an intumescent flame retardant (IFR). When the TCA content in the IFR was 35 wt% to 45 wt%, the IFR had good expansion properties. Then, different proportions of IFR were incorporated into polypropylene (PP) to prepare flame retardant PP composites, and the flame retardancy, thermal degradation behaviour and flammability behaviour for PP composites were investigated by limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter test. When 20 wt% of IFR (With TCA 35 wt%) were added into the PP matrix, the composite achieved a V-0 rating for the UL-94 test and its LOI value was increased to 28.8%. Compared with neat PP, peak heat release rate (PHRR) and total heat release (THR) decreased from 827.30(KW·m−2) and 120.48(MJ·m−2) to 210.50(KW·m−2) and 75.08(MJ·m−2).
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 89
·期 2
·492-499
·
IF 1.745
Wang Li,Li Jing,Wang Meiri,Liu Yuanyuan,Cui Hongtao
Abstract 2D nanostructured Co 2+ -doped β-Ni(OH) 2 as electrode material for application in redox-type supercapacitors was synthesized by a strategy of nickel complex template. The 2D Co 2+ -doped β-Ni(OH) 2 was produced by the in situ reaction of 2D Co 2+ -doped template in strong alkaline electrolyte solution during electrochemical measurement. Due to the large interface and the promoted conductivity induced by Co 2+ doping, the Co 2+ -doped β-Ni(OH) 2 exhibited high electrochemical performance. It had high specific capacitance of about 2100 F g –1 at low current density of ~2 A g −1 . It also exhibited excellent high rate performance (1259 F g –1 at high current density of 41.7 A g −1 ), much higher than the undoped sample. The results in this work indicated that the Co 2+ -doped β-Ni(OH) 2 could be used as an effective electrode material in redox supercapacitors.
2D nanostructured Co 2+ -doped β-Ni(OH) 2 as electrode material for application in redox-type supercapacitors was in situ synthesized by a strategy of nickel complex template. Due to the large interface and the promoted conductivity induced by Co 2+ doping, the as-synthesized material exhibited excellent high rate electrochemical performance.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yanhong Li,Jing Li,Meiri Wang,Yuanyuan Liu,Hongtao Cui
In this work, a “Co 2+ doping” new strategy is proposed to promote the high rate performance and extend the cycling life of nickel-based sulfides. The Co 2+ doped Ni 3 S 4 nanosheets are prepared at mild conditions by a scalable method of solid-state reaction. The preparation of doped sulfide includes two steps: 1) formation of amorphous Co 2+ doped nickel sulfide nanosheets by grinding the mixture of raw materials at room temperature in a mortar; 2) crystallization to Co 2+ doped Ni 3 S 4 nanosheets at 150 °C for 5 h. Due to the doped Co 2+ ions, the as-prepared sulfide presents promoted high rate performance and prolonged cycling life. It should be pointed out that the “Co 2+ doping” strategy for the electrochemical stabilization of nickel-based sulfides could be easily scaled up due to the large-scale preparation characteristics and high performance of produced material.
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高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2019
·Vol. 32
·期 2
·259-266
·
IF 0.791
Song Wen-tao,Hu Yong-jun,Jin Shan,Li Yu-jian
The radiation damage of biomolecules, in particular with aliphatic compound, has been extensively studied. Morpholine is a typical six-membered aliphatic heterocyclic compound. In the present work, photoionization and dissociation of the morpholine monomer and subsequent fragmentations have been investigated by synchrotron vacuum ultraviolet photoionization mass spectrometry and theoretical calculations. The vertical ionization energy of morpholine monomer is 8.37±0.05 eV, which agrees reasonably well with a theo-retical value 8.41 eV of morpholine. Experimentally observed fragmentation of morpholine ( m/z =87 amu) gives rise to m/z =86 amu, m/z =57 amu, and m/z =29 amu. Based on experimental and theoretical results, it is found that the m/z =86 amu is produced by losing H atom, the m/z =57 amu is formed by the elimination of CH 2 O with a ring-opening process, the m/z =29 amu is generated by further dissociation of the fragment m/z =57 amu (C 3 H 7 N) + by the elimination of C 2 H 4 . This finding would provide valuable insight into the photo-damage of aliphatic compounds, which may be related to living cells and other biological system.
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Journal of Analytical Methods in Chemistry
·
2018
·
IF 1.262
Mengsi Cao,Pingping Zhang,Yanru Feng,Huayin Zhang,Huaijiao Zhu,Kaoqi Lian,Weijun Kang
A reliable derivatization method has been developed to detect and quantify morpholine in apple juices and ibuprofen with gas chromatography-mass spectrometry. Morpholine can react with sodium nitrite under acidic condition to produce stable and volatile N-nitrosomorpholine derivative. In this experiment, various factors affecting the derivatization and extraction process were optimized, including volume and concentration of hydrochloric acid, quantity of sodium nitrite, derivatization temperature, derivatization time, extraction reagents, and extraction time. The derivative was extracted with dichloromethane and determined by gas chromatography-mass spectrometry. The linearity range of morpholine was 10–500 g·L−1 with good correlation, and limits of detection (LOD) and limits of quantification (LOQ) were 7.3 g·L−1 and 24.4 g·L−1, respectively. Low, medium, and high concentrations of morpholine were added in apple juices and ibuprofen samples to evaluate standard recovery rate and relative standard deviation. The spiked recovery rate ranged from 94.3% to 109.0%, and the intraday repeatability and interday reproducibility were 2.0%–4.4% and 3.3%–7.0%, respectively. The developed method has good accuracy and precision. This quantitative method for morpholine is simple, sensitive, rapid, and low cost and can successfully be applied to analyze the residual morpholine in apple juices and drug samples.
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PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2018
·Vol. 26
·期 3
·793-802
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IF 1.858
Wu Hong,Wang Xianshu,Liu Fei,Cao Jianxin
The SAPO-34/ZSM-5 composite catalyst (SZ-TS) was successfully fabricated using a two-step in situ crystallization method. X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, N 2 adsorption–desorption, and ammonia temperature-programmed desorption measurements were used to characterize the synthesized catalysts and evaluate their catalytic performances on methanol-to-olefin (MTO) reaction. The synthesis mechanism of two-step in situ crystallization was further investigated. Results showed that the SZ-TS synthesized by two-step in situ crystallization featured an intimately bonded composite structure owing to the synergistic effects of the interface. However, the physical mixture of SAPO-34 and ZSM-5 (SZ-PM) presented two discrete phase structures. By using the composite catalyst in MTO reaction, the SZ-TS exhibited the longest life of 1400 min, which was much higher than that of SZ-PM (720 min). Methanol conversion reached 97.3%, and the selectivity for light olefins totalled 93.0%. The excellent catalytic performance of SZ-TS was attributed to the hierarchical pore structure and suitably weak acid site distribution. Via pre-crystallization, alkalinity can be adjusted in the adjacent ranges of SAPO-34 and ZSM-5. By adding the pre-crystallized alkaline SAPO-34 slurry into the strong alkaline system of the parent ZSM-5 slurry, phase dissolution of SAPO-34 in the secondary crystallization solution was avoided. The external surface of SAPO-34 was etched in the alkaline environment of the secondary crystallization solution, resulting in hierarchical pore distribution, which benefited the MTO reaction. This in situ synthesis method features the advantages of simplicity, low time consumption, and low cost. Therefore, this approach possesses the potential to satisfy the demands of the MTO market.
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ACS Catalysis
·
2024
·
IF 11.3
Yiwei Sun,Xiaoli Wei,Wei Zhang,Zhen Wang,Jianhai Jiang,Fangcao Liu,Bing Liu,Wenfeng Han
Conversion of potent greenhouse gases, hydrofluorocarbons (HFCs), to value-added hydrofluoroolefins (HFOs) is of great importance. AlF3 catalysts play a major role in this process. Formation and maintenance under coordinated Al are the key to prepare efficient catalysts. Herein, carbon interacted AlF3 nanoclusters catalyst (AlF3–SAPO-5) was effectively achieved with SAPO-5 molecular sieves as precursors via pyrolysis followed by in situ fluorination. This process results in a strong interaction between the carbonaceous material and active aluminum (Al) species. The results show that AlF3–SAPO-5 possesses both high activity and thermal stability. For 1,1-difluoroethane (HFC-152a) dehydrofluorination, the conversion can reach up to 95% at a reaction temperature of 350 °C. The reaction rate is almost 4 times higher than that of AlF3 prepared by traditional pyrolysis (AlF3-py). It implies that the confinement effect contributes to the formation of AlF3 nanoclusters with abundant 4- and 5-coordinated Al species stabilized by the F–Al–O–C structure. In addition, the carbon-interacted AlF3 nanoclusters exhibit superb sintering resistance. Given its fantastic activity and thermal stability, the carbon-interacted AlF3 nanoclusters show great potential for the catalytic dehydrofluorination of fluorinated alkanes.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2015
·
IF 2.999
Hongtao Cui,Junying Xue,Wanzhong Ren,Minmin Wang
SnO 2 quantum dots are prepared at an ultra-large scale by a productive synthetic procedure without using any organic ligand. The grinding of solid mixture of SnCl 2 ⋅2H 2 O and ammonium persulphate with morpholine in a mortar at room temperature produces 1.2 nm SnO 2 quantum dots within 5 min. The formation of SnO 2 is initiated by the reaction between tin ions and hydroxyl groups generated from hydrolysis of morpholine in the released hydrate water from SnCl 2 ⋅2H 2 O. It is considered that as water is rapidly consumed by the hydrolysis reaction of morpholine, the growth process of particles is self-terminated immediately after their transitory period of nucleation and growth. As a result of simple procedure and high toleration to scaling up of preparation, at least 50 g of SnO 2 quantum dots can be produced in one batch in our laboratory. The as prepared quantum dots present high electrochemical performance due to the effective faradaic reaction and the alternative trapping of electrons and holes.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Yapeng Hu,Xiangmei Wang,Juan Li
An exfoliated montmorillonite (E-MMT) was prepared by introducing Ni2+ and melamine formaldehyde into layers of MMT. The E-MMT was applied to regulate the flame retardant properties of polypropylene (PP)/intumescent flame retardant (IFR) composites. The IFR used consists of ammonium polyphosphate (APP) and a charring agent, 1,3,5-triazine-2,4,6-trimorpholinyl (TTM). The results revealed that the E-MMT has good synergistic effect on flame retardancy of PP/IFR composites. The PP composites with 16 wt % IFR and 3 wt % E-MMT can pass the UL94 V-0 test. Moreover, the E-MMT not only improves the char residues of IFR and PP/IFR blend but also changes the micromorphology of char, turning the compact surface char produced by PP/IFR into microporous char. This microporous char is so good for isolating heat and mass between PP and the outside that a better flame retardant property is obtained.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 2
·326-332
·
IF 1.473
Ma Wenle,Feng Yongmei,Wang Li,Xue Junying,Cui Hongtao
Abstract Mn 3 O 4 nanoparticles were prepared at 60 °C in ethanol solution by a facile precipitation method. It was found that the particle size of the as-prepared Mn 3 O 4 depended on the alkalinity of precipitants. Nanoparticles with average size of 6 nm were obtained by using morpholine as precipitant which had low alkalinity, while 10 nm particles were produced by using NaOH as precipitant. The former particles presented higher degree electrochemical double-layer capacitor-like behavior and higher electrochemical performance than the latter. This could be attributed to the effective faradaic reactions of particles, which originated from the low equivalent series resistance resulting from their smaller particle size. Graphical Abstract Mn 3 O 4 nanoparticles were prepared in ethanol by a facile precipitation method using precipitants with different alkalinity. It was found that smaller particles (a) were generated by using precipitant with low alkalinity as compared with the one with higher alkalinity (b). As a result, the Mn 3 O 4 nanoparticles presented a high-degree electrochemical double-layer capacitor-like behavior due to their low equivalent series resistance.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 11
·6179-6186
·
IF 3.108
Huaqi Zhan,Yongjun Hu,Pengchao Wang,Jiaxin Chen
Morpholine (NH(CH2CH2)2O) is a typical six-membered aliphatic heterocyclic compound. Herein, infrared plus vacuum ultraviolet (IR/VUV) single photon “soft” ionization spectroscopy was employed to study the structures of neutral morpholine and its monohydrated clusters. Theoretical calculations revealed that the structures containing equatorial-chair and axial-chair conformations were the most stable conformers in the gas phase, and this was confirmed by IR spectral analysis. Analysis of the observed and calculated spectra of the monohydrated clusters suggested that multiple conformers may co-exist in the molecular beam, and that the water molecule acts as a hydrogen donor. In the most stable structure, the hydrogen atom of the water molecule is bound to the NH group of the equatorial-chair conformer of morpholine. Moreover, the water molecules simultaneously serve as hydrogen bond donors for the NH group and interact with the CH group weakly. It is suggested that the weak intermolecular CH⋯O interaction is also responsible for the molecular stability.
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高影响因子
ADVANCED POWDER TECHNOLOGY
·
2014
·
IF 1.642
Hongtao Cui,Junyin Xue,Minmin Wang
α-Ni(OH) 2 nanosheets were prepared at room temperature on ultra large scale through a solvent-free reaction. The nanosheets were obtained by grinding the mixture of nickel nitrate hexahydrate and morpholine in a mortar for 5 min. The maximum capacity of production in single batch was only limited by volume of the vessels used in preparation. The as-prepared nanosheets exhibited the highest specific capacitance of 2080.8 F g −1 at discharge current density of 0.6 A g −1 in a 6 mol l −1 KOH aqueous solution. The nanosheets also presented other high electrochemical performances such as nearly 100% coulombic efficiency, excellent rate capacity and high stability. These results indicated that the α-Ni(OH) 2 nanosheets can be used as a high performance electrochemical material for application in supercapacitor .
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