MOLECULES
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2015
·Vol. 20
·期 10
·19393-19405
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IF 2.416
Yongkang Gai,Zhongping Hu,Zhao Rong,Xiang Ma,Guangya Xiang
The preparation of triazamacrocyclic hydroxypyridinonate (HOPO-TACN) derivatives as potential chelators for metals in biomedical applications was reported. The synthesis is based on a convergent synthetic approach, in which the key intermediate di-tert-butyl-2,2′-(1,4,7-triazonane-1,4-diyl) diacetate was coupled with a hydroxypyridinonate pendant arm. The method is suitable for rapid syntheses of metal chelator HOPO-TACNs of biomedical interest.Keywords:1,4,7-triazonane;hydroxypyridinonate;metal chelator
研究领域:
生物化学
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医学化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
·
IF 2.694
Hao Wang,Nianzu Zhang,Xiaopo Wang
Densities and viscosities for the binary mixtures of n-nonane/1-heptanol, n-nonane/1-octanol, n-nonane/1-nonanol, and n-nonane/1-decanol were presented in this work. The measurements were carried out using an Anton Paar digital vibrating U-tube densimeter and an Ubbelohde capillary viscometer, and the entire composition range was investigated from 303.15 to 333.15 K at atmospheric pressure. In addition, the excess molar volumes and viscosity deviations of the mixtures were calculated and discussed. The Redlich–Kister equation was used to correlate the two derived properties. Furthermore, the viscosities of the studied mixtures were fitted to Eyring-type models.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
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2023
·
IF 2.6
Shuo Yuan,Yi Liu,Jingwei Cui,Xiong Zheng
Hydrocarbons have wide applications in various industrial processes, and the knowledge of thermophysical properties is the foundation for their utilization. As an important thermophysical property, the thermal conductivity of fluids is vital in the evaluation of energy conversion quality, like heat transfer enhancement , thermodynamic cycle efficiency evaluation, etc. Therefore, obtaining accurate experimental data is of great importance for the utilization of hydrocarbons. Here, the thermal conductivities of liquid n-nonane and n-undecane were investigated using the transient hot-wire method (combined expanded uncertainty is 2.0 %) with a wide temperature and pressure range from 293.15 to 523.15 K and 0.1 to 15.0 MPa. For the convenience of engineering applications, a polynomial as a function of temperature and pressure was proposed to correlate the experimental data, the average absolute deviations between experimental data and fitted data are 0.29 % for n-nonane and 0.35 % for n-undecane, which indicates that the polynomial describes the experimental data well in the measured region. Meanwhile, the available literary data were collected and compared with our results, and good agreement was found between literary data and our results. This work is not only helpful for the industrial applications of hydrocarbons but also helps to understand the internal mechanism of the thermal conductivity of hydrocarbons.
研究领域:
化学工程
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热物理
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产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
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2022
·
IF 6.888
Jianfeng Li,Jinjin Li
Oxidized black phosphorus (BP) has been demonstrated as a promising oil-based nanoadditive because of its superior friction-reducing capability. However, the synergistic lubrication effect between oxidized BP and oil at the molecular level dominating the friction properties remains unclear. In this Letter, the synergistic lubrication effect between oxidized BP and two typical oil molecules (nonane and nonanoic acid) was explored with an atomic force microscope. The superlubricity of oxidized BP with an ultralow friction coefficient of 0.006 was achieved in the nonanoic acid environment, exhibiting a 96% reduction compared with that in the nonane environment. There was a confined nonanoic acid layer in the contact zone with a tilt angle of 35° because of the hydrogen bonding interaction, contributing to the superlubricity. This observation sheds light on the exploration of the lubrication mechanism of oxidized BP as a nanoadditive in oil, which reveals the considerable implications for the design of high-performance lubrication system.
研究领域:
纳米技术
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材料科学
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摩擦学
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表面科学
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化学物理
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
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2014
·
IF 2.216
Jian-Xiong Li,Lei Liu,An-Hua Liu
N-substituted diazabicyclononanes with different benzylic substituents were synthesized by hydrogenating diazabicyclononene with LiAlH 4 and alkylating secondary amine with halobenzyl derivatives. The synthesized diazabicyclononanes were identified with NMR spectrometry ; the UV absorption and fluorescence emission of the diazabicyclononanes were examined with spectroscopes; the reactivity of the diazabicyclononane as radical photoinitiator and photolatent base were evaluated with DSC , FTIR spectroscope and gel fraction determination; the effects of substituents on the photoactivities of the diazabicyclononanes were investigated. Electron conjugation in the substituents played a prominent role on the photoactivity. As the conjugation extended, the extinction coefficient increased and fluorescence decreased; meanwhile, the UV absorption expanded towards low frequency. For diazabicyclononane N-substituted with 4-methylene benzophenone, the maximum absorption appeared around 256 nm with extinction coefficient 1.78×10 4− mol −1 L cm −1 . It could work as radical photoinitiator and photolatent base simultaneously. With this diazabicyclononane, epoxy acrylate could be UV cured within seconds and the activation temperature of epoxy/anhydride could be reduced 50 °C after UV excitation. The gel fraction of acrylate/epoxy hybrid resins could be about 90% after UV-thermal dual curing.
研究领域:
有机化学
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材料科学
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光化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2016
·
IF 2.74
Junzhi Li,Junqiang Wang,Wei Zhao,Xiaoliang Li
Isobaric vapor-liquid equilibrium (VLE) data for the four systems n -heptane + 2-methylthiophene, 2,2,4-trimethylpentane + 2-methylthiophene, n -nonane + 2-methylthiophene, n -decane + 2-methylthiophene were measured at 90.00 kPa with a modified Rose-Williams still. Gas chromatography equipped with a flame ionization detector was used to analyze composition of the samples from the vapor-liquid equilibrium systems. All the VLE measurements passed the thermodynamic consistent test using the Herington method and the Van Ness test. The azeotropic behavior was found in the 2,2,4-trimethylpentane + 2-methylthiophene system. The experimental data were correlated by the Wilson and NRTL activity coefficient models and also compared with the original UNIFAC predictive model. The corresponding parameters for the three models were obtained. The results exhibited that the measured data got agree well with the calculated values using the Wilson, NRTL and original UNIFAC models.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
·
IF 2.323
Shenfeng Yuan,Jiafeng Liu,Hong Yin,Zhirong Chen
Liquid–liquid equilibrium (LLE) data for the quaternary systems of ethanol + butanol + octane + water and ethanol + butanol + nonane + water were obtained at 298.15 K under atmospheric pressure in this article. The nonrandom two-liquid (NRTL) equation was used to correlate the LLE data, and the two quaternary systems were used to regress the interaction parameters of the model. The obtained interaction parameters of NRTL model were used to predict the LLE of the quinary system ethanol + butanol + octane + nonane + water and was compared with the experimental values. The results showed that the calculated values coincided with the experimental data well, an indication that the NRTL model and the interaction parameters obtained from quaternary systems could be used to predict the LLE data of quinary system. The LLE data of the quinary system were also characterized by the distribution coefficient and the selectivity, and the results showed that the ethanol aqueous solution which contained about 40 wt % ethanol was suitable for separating butanol from the butanol–octane–nonane mixture.
研究领域:
化学工程
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热力学
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物理化学
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产品关联
DOI
高影响因子
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