CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2015
·Vol. 31
·期 5
·761-765
·
IF 0.875
Sun Weizhi,Yu Shitao,Xian Mo
To investigate the green trinitration method of aromatic compounds, with Lewis acid/ionic liquid as catalyst and HNO 3 /Ac 2 O as nitration reagent, a Lewis acid/ionic liquid/HNO 3 /Ac 2 O system was established. In various combinations of Lewis acids and ionic liquids, Bi(NO 3 ) 3 ·5H 2 O/[HMIM]ClO 4 proved to be a very efficient catalyst for the trinitration of activated aromatic compounds and reusable for 3 times. Reaction conditions for the trinitration were optimized and yields of the trinitro products were from mild to excellent. This sulfuric acid-free system has the advantages of strong trinitration ability, low environment pollution, low toxicity, low cost and high potential for industrial application.
研究领域:
有机化学
·
环境化学
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Yuming Deng,Jiahui Zhou,Mengjie Si,Gaopeng Wang,Yueman Tang,Zi Rong Zhang,Jiayu Hu,Yan-jie Wang,Jintao Yang,Si Yu Zheng
Polyzwitterionic gels possess a high density of ionic groups and present great potential in ionotronics. However, zwitterionic chains are easy to be highly hydrated, leading to weak interchain interactions and a poor mechanical performance. Although metal ions like Fe3+ show great effectiveness in toughening hydrogels, they usually weaken the zwitterionic gel inversely due to the anti-polyelectrolyte effect. Herein, a special co-ion effect of Fe(ClO4)3 is found, which is adopted to toughen the zwitterionic hydrogel. In contrast to the weak effect of Fe(NO3)3, FeBr3, and FeCl3 salts on gel toughness, Fe(ClO4)3 can toughen the imidazolium-based polyzwitterion (pVBIPS) effectively. The Fe(ClO4)3-treated pVBIPS gel exhibits a high ultimate tensile stress of 1.34 MPa, a Young’s modulus of 1.2 MPa, and tensile work of 2.29 MJ/m3, surpassing many existing pure zwitterionic hydrogels. It is found that the ClO4– ions can effectively bind to the imidazolium moiety of pVBIPS and promote the formation of SO3––Fe3+ interactions; the trivalent Fe3+ ions can then bridge multiple sulfonate groups to impart the strength. This work should offer a new strategy for developing tough zwitterionic hydrogels.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energetic Materials
·
2019
·
IF 1.649
Qi Jia,Xueyuan Bai,Shaoyong Zhu,Xiong Cao,Peng Deng,Lishuang Hu
Nano (H2dabco)[K(ClO4)3] (DAP-2) were successfully prepared via the milling method. The morphology and structure of the as-obtained sample were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The results showed the nano DAP-2 with nearly spherical morphologies have a narrow particle size distribution ranged from 1μm to 2μm. The thermal decomposition properties were investigated by thermogravimetric-differential scanning calorimeter (TG-DSC). The exothermal peak of nano DAP-2 thermal decomposition is 384.5°C decreased by 6.7°C compared with raw DAP-2 (391.2°C). And the apparent activation energy (Ea) of nano DAP-2 was calculated as 173.346 kJ mol−1 by Kissinger equation, which is lower than raw DAP-2 (177.699 kJ·mol−1). Sensitivity study showed that the nano DAP-2 (H50: 60.63 cm) exhibited lower impact sensitivity than raw DAP-2 (H50: 36.79 cm). Therefore, this work provides a simple and effective way to improve the thermal decomposition properties and safety performance of molecular perovskite energetic materials.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2021
·Vol. 30
·期 2
·1567-1576
·
IF 1.819
Ma Jingling,Jia Xingliang,Ma Mingsheng,Zhang Chenfei,Ren Fengzhang,Wang Guangxin
To limit corrosion and retain activity of magnesium anode, magnesium–air batteries with double solutions: 0.5 M Mg(ClO 4 ) 2 - N , N -dimethylformamide (DMF)/0.6 M NaCl-H 2 O, 0.5 M Mg(ClO 4 ) 2 –acetonitrile (AN)/0.6 M NaCl-H 2 O are prepared. Cathodic and anodic reactions proceed in inorganic and organic solutions separately. Discharge performance, discharge morphology, and corrosion behavior of magnesium anode are researched. Results obtained show that organic electrolytes separate anode from the aqueous electrolyte, thus improving anode utilization rate. Due to 0.6 M NaCl solution used in air cathode side, the batteries show higher discharge voltages. A better discharge performance has been observed in double electrolytes at 1 mA·cm −2 discharge. Results of discharge morphology and electrochemical impedance spectroscopy agree well with discharge performance. The discharge mechanism of magnesium anode in different solutions is also discussed.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2026
·Vol. 16
·期 5
·523
·
IF 3.4
Xuanrui Wang,Ke Xu,Yuxing Tan,Xinru Liang,Pindong Tan,Yu Sun,Jinjian Hou,Cheng Niu,Jinze Du
HighlightsWhat are the main findings?[Bmim][ClO4] increased heavy-oil recovery in toluene and xylene systems.[Bmim][ClO4] reduced recovered-oil viscosity and improved flowability.[Bmim][ClO4] lowered contact angle and weakened oil–solid adhesion.What are the implications of the main findings?[Bmim][ClO4] is a promising additive for heavy-oil extraction.Interfacial regulation is key to improving heavy-oil separation efficiency.Preferential interaction with resins/asphaltenes explains enhanced recovery.Separating heavy oil from solid matrices is still difficult, mainly because of the strong adhesion between oil and solids and the intrinsically high viscosity of heavy oil, both of which restrict efficient large-scale recovery. Ionic liquids have recently attracted attention as additives that may improve extraction performance. In this work, [Bmim][ClO4] was introduced into toluene- and xylene-based solvent systems to examine its role in heavy-oil recovery. The extraction performance was evaluated through recovery yield, viscosity, contact angle, oil–solid interaction force, and SARA composition. Molecular dynamics simulation was also carried out to probe how [Bmim][ClO4] interacts with heavy-oil components and how it influences the diffusion of saturates, aromatics, resins, and asphaltenes. The results show that the addition of [Bmim][ClO4] improved heavy-oil recovery in every solvent system tested, with the highest value, 89.31 wt%, obtained in the toluene system. At the same time, the ionic liquid lowered the viscosity, reduced the contact angle, and weakened the adhesion between the oil phase and the solid surface, all of which favored oil–solid separation. SARA analysis further indicated that the extraction of heavier fractions, especially resins and asphaltenes, became more pronounced after adding the ionic liquid. Simulation results suggest that [Bmim][ClO4] interacts more strongly with resins and asphaltenes, disrupts their associated structures, and facilitates mass transfer. Taken together, these results suggest that [Bmim][ClO4] improves heavy-oil extraction by altering interfacial behavior and loosening the aggregated structure of heavy fractions, which may be useful for future process optimization.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Peijun Yang,Zhidan Diao,Hui Jin,Shaohua Shen
Sodium-ion batteries (SIBs) have attracted much attention for their high energy densities and low cost. However, the unstable solid-liquid interphase seriously restricts the development and application of SIBs. Herein, Ca(ClO 4 ) 2 as a new-type electrolyte additive is developed to engineer the solid-liquid interphase of carbon-coated anodes. In the electrolyte with an appropriate concentration of Ca(ClO 4 ) 2 , Ca 2+ can insert into the carbon coating and form a passivation layer during the first cycle, reducing the irreversible sodium-ion capture in the carbon coating and the electrolyte decomposition at the solid-liquid interface. Thus, the carbon-coated anode with a thin and stable solid electrolyte interphase (SEI) layer formed realizes the superior sodium storage performance with enhanced sodium-ion diffusion kinetics. Specifically, after adding 0.015 M Ca(ClO 4 ) 2 into the electrolyte, the reversible capacity of carbon-coated TiO 2 anode could be greatly improved from 271.2 mAh g −1 to 335.1 mAh g −1 at 50 mA g −1 , with the initial coulombic efficiency increasing from 41.2 % to 48.7 %. This study provides an alternative strategy to optimizing the SEI layer of carbon-coated TiO 2 anode for superior sodium storage property, which also can be applied to other carbon-coated anodes for SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Hui Ma,Ronghua Zhang,Qi Kang,Tao Wang,Jianhong Xiao,Xuezhi Li,Li Yu
A facile, low-cost and label-free liquid crystals (LCs) sensing platform laden with Cu(ClO 4 ) 2 was herein established for detection and distinction of sulfhydryl amino acids, namely cysteine (Cys) and homocysteine (Hcy). When introducing Cys or Hcy to the fluid interface with Cu(ClO 4 ) 2 , the optical appearance of LCs exhibited a bright-to-dark transition, which coupled to the interactions between Cu 2+ and the sulphydryl of amino acids. Concomitantly with, the orientation of LCs varied from tilted to homeotropic state. Besides, this sensor system did not respond to other nineteen amino acids that make up human proteins. The detection limit of Cys and Hcy is around 0.01 mg/mL (~82.5 μM) and 0.05 mg/mL (~370.0 μM), respectively. Compared with Cys, the as-prepared LCs sensing platform shows a higher detection limit and longer response time for Hcy, based on which these two sulfhydryl amino acids can be distinguished from each other. This can be attributed to the additional methylene for Hcy, resulting in formation of a five-membered ring Hcy thiolactone which may not chelate with Cu 2+ . The LCs-based analytical platform constructed in this work can provide a convenient and label-free method for detecting and differentiating sulfhydryl amino acids.
研究领域:
分析化学
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生物传感
·
医学检测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2011
·
IF 1.599
Xian-Lan Hong,Hong Li,Cui-Hong Peng
A new Ru(II) complex [Ru(dmb) 2 (pdta)](ClO 4 ) 2 ( 1 ) (dmb = 4,4′-dimethyl-2,2′-bipyridine, pdta = 3-(pyridine-2-yl)-as-triazino [5,6-f]-acenaphthylene) was synthesized and characterized by elemental analysis (EA), ES–MS, 1 H NMR, UV–Vis and CV. The DNA-binding properties of complex 1 were investigated by absorption titration, thermal denaturation , viscosity measurement and photoactivated cleavage. The DNA-binding constant was determined to be 2.37 ± 0.14 × 10 5 M −1 ( s = 1.90 ± 0.04) by electronic absorption titration, indicating that complex 1 interacts with DNA through intercalative mode. The redox peak potentials of this complex in CV were rationally assigned with the frontier molecular orbital stereographs resulting from the density functional theory (DFT) calculation. The photoactivated cleavage and cleavage mechanism of plasmid pBR322 DNA in the presence of complex 1 and various inhibitors were studied. The experiment for detecting the formation of singlet oxygen photo-sensitized by complex 1 was carried out, and the antioxidant activity of the Ru-complex and the ligand pdta against hydroxyl radical was also investigated.
研究领域:
无机化学
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生物化学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
EcoMat
·
2022
·Vol. 4
·期 2
·e12165
·
IF 12.213
Guoshen Yang,Jialei Huang,Xuhao Wan,Binbin Liu,Yachao Zhu,Jiawei Wang,Olivier Fontaine,Shiqiang Luo,Pritesh Hiralal,Yuzheng Guo,Hang Zhou
Rechargeable aqueous zinc-ion batteries (ZIBs) have been considered as a promising candidate for the large-scale energy storage device owing to their low cost and high safety. However, the practical application of aqueous ZIBs at low temperature environment is hindered by the freezing aqueous electrolytes, which leads to a sharp drop in ionic conductivity, and thereby a rapid deterioration of battery performance. Herein, a chaotropic salt electrolyte based on low concentration aqueous Zn(ClO 4 ) 2 with superior ionic conductivity under low temperature (4.23 mS/cm at −50°C) is reported. The anti-freezing methodology introduced here is completely different from conventional freeze-resistant design of using “water-in-salt” electrolyte, cosolvents, or anti-freezing agent additives strategy. Experimental analysis and molecular dynamics simulations reveal that the as-prepared Zn(ClO 4 ) 2 electrolyte possesses faster ionic migration compared with other commonly used Zn-based salts (i.e., Zn(CF 3 SO 3 ) 2 and ZnSO 4 ) electrolyte. It is found that Zn(ClO 4 ) 2 electrolyte can suppress the ice crystal construction by forming more hydrogen bonds between solute ClO 4 − and solvent H 2 O molecules, thus leading to a superior anti-freezing property. The fabricated ZIBs using this aqueous electrolyte exhibits a dramatically enhanced specific capacity, remarkable rate capability, and great cycling stability over a wide temperature range, from −50 to 25°C. The aqueous ZIBs also exhibit an outstanding energy density of 238.4 Wh/kg without compromising the power density (7.9 kW/kg) under −20°C. Moreover, the assembled aqueous ZIBs can also cycle stably over 1000 cycles at an ultra-low −50°C. The high-safety and cost-effective chaotropic salt electrolyte presented here is a promising strategy for low temperature energy storage application.
研究领域:
电化学
·
能量存储
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材料科学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2022
·
IF 12.781
Guoshen Yang,Gangrui Qu,Chi Fang,Jie Deng,Xianqi Xu,Yinghao Xie,Tian Sun,Yachao Zhu,Jiaxin Zheng,Hang Zhou
The recent advances in aqueous magnesium-ion hybrid supercapacitor (MHSC) have attracted great attention as it brings together the benefits of high energy density, high power density, and synchronously addresses cost and safety issues. However, the freeze of aqueous electrolytes discourages aqueous MHSC from operating at low-temperature conditions. Here, a low-concentration aqueous solution of 4 mol L −1 Mg(ClO 4 ) 2 is devised for its low freezing point (−67 °C) and ultra-high ionic conductivity (3.37 mS cm −1 at −50 °C). Both physical characterizations and computational simulations revealed that the Mg(ClO 4 ) 2 can effectively disrupt the original hydrogen bond network among water molecules via transmuting the electrolyte structure, thus yielding a low freezing point. Thus, the Mg(ClO 4 ) 2 electrolytes endue aqueous MHSC with a wider temperature operation range (−50 °C–25 °C) and a higher energy density of 103.9 Wh kg −1 at 3.68 kW kg −1 over commonly used magnesium salts (i.e., MgSO 4 and Mg(NO 3 ) 2 ) electrolytes. Furthermore, a quasi-solid-state MHSC based on polyacrylamide-based hydrogel electrolyte holds superior low-temperature performance, excellent flexibility, and high safety. This work pioneers a convenient, cheap, and eco-friendly tactic to procure low-temperature aqueous magnesium-ion energy storage device.
研究领域:
电化学
·
能源存储
·
材料科学
·
超级电容器
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Huimei Pan,Baiyang Chen
Although UV and/or VUV tandem I – are often proposed as advanced reduction processes (ARPs) to eliminate micropollutants by generating e aq – , the fate of I – and its byproducts formation remain to be explored. Therefore, this study investigated the iodine species evolution during UV/I – and UV/VUV/I – processes under different influencing factors. Results show that UV/VUV oxidized most of I – to IO 3 – whereas UV only oxidized a portion of I – to intermediate reactive iodine species (RISs, including I 2 , HOI, and I 3 – ); meanwhile, substantial H 2 O 2 was generated only in UV/VUV/I – process but not in UV/I – process, proving that UV/VUV owns stronger oxidation ability than UV alone. Spiking I – into water exerted triple-sided effects by consuming •OH, generating e aq – , and shielding light, thus complicating the systems. Holistically, increasing pH or decreasing dissolved oxygen converted oxidizing environment into reducing condition and caused less RISs formation, especially for UV/VUV/I – . For oxyhalides , neither UV/I – nor UV/VUV/I – degraded ClO 4 – . While UV/I – cannot remove ClO 3 – , UV/VUV/I – reduced ClO 3 – to Cl – . Expectedly, both UV/I – and UV/VUV/I – reduced BrO 3 – to Br – more efficiently than UV and UV/VUV, confirming that I – can enhance the reduction capacities of UV/VUV and UV technologies .
研究领域:
环境科学
·
水处理
·
化学工程
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2020
·Vol. 13
·期 9
·2239-2244
·
IF 7.962
Yuwen Luo,Feipeng Zheng,Luojia Liu,Kaixiang Lei,Xuesen Hou,Gang Xu,Hui Meng,Jifu Shi,Fujun Li
Graphical Tunable operating voltage : The anion effect induces a varied redox ability of p-type organic radicals, leading to tunable operating voltage of Zn–organic radical batteries. DFT calculations reveal that the stronger interaction of the anion with the organic radical host, the higher the operating voltage of the Zn–organic radical battery. In contrast to traditional rechargeable rock-chair metal-ion batteries, dual-ion batteries (DIBs) involve redox reactions with anions rather than cations in p-type cathodes. In principle, regulating the electrochemical performance of the DIB by different anion species is highly feasible. Herein, the anion effect on the electrochemical performance of a DIB, the aqueous Zn– organic radical battery (Zn-ORB), consisting of a poly(2,2,6,6tetramethylpiperidinyloxy-4-yl vinyl ether) cathode and a Zn anode, was investigated by DFT calculations. SO 4 2− , CF 3 SO 3 − , and ClO 4 − with different molecular electrostatic potential values were selected as anion models. DFT calculations revealed that a stronger electrostatic interaction of the anion with the organic radical resulted in a higher operating voltage of the Zn-ORB, which was consistent with experimental results. These results bring new insight into the redox chemistry of p-type organic radicals with anions and will promote the development of high-power aqueous Zn-ORBs as well as inspire more investigations into the anion effect towards novel battery designs.
研究领域:
电化学
·
电池技术
·
材料科学
·
计算化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）