JOURNAL OF SOLUTION CHEMISTRY
·
2019
·Vol. 48
·期 4
·546-563
·
IF 1.039
Li Dan,Wang Zhiyong,Guo Meng,Wang Huiqin,Chen Xiaoyan
Densities, viscosity and bubble-point vapor pressures for binary mixtures of dimethoxy methane and a hydrocarbon fuel ( exo -tetrahydrodicyclopentadiene) were measured over the whole composition range. The excess molar volumes ( \( V_{\text{m}}^{\text{E}} \) ) and viscosity deviations (Δ η ) for the binary systems were calculated from the density and viscosity data. The Antoine equation was fitted with the experimental vapor pressures, and the corresponding parameters were calculated. Positive values of excess molar volumes, negative viscosity deviations and positive deviations from Raoult’s law for the vapor pressures are observed. The three physical properties and the corresponding calculation results provide valuable information on the application and study of mixed liquid hydrocarbon fuels.
研究领域:
化学工程
·
热力学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2019
·
IF 2.251
Wenting Xu,Qiang Song,Guochang Song,Qiang Yao
The vapor pressure data of Se and SeO 2 in low temperature range are essential for the study of emission and migration of selenium from stationary sources. The vapor pressure of SeO 2 at 353.2–473.2 K was measured by thermogravimetric analysis, and the corresponding pressure was 0.026–319.2 Pa. The vapor pressure of Se at 423.2–573.2 K was measured, and the corresponding pressure was 0.007–80.9 Pa. The triple point temperature and pressure of Se determined in this experiment were 491.2 ± 1 K and 2.16 ± 0.27 Pa. The extended uncertainty of temperature measurement ( k = 2) was 1.86 K, and the extended relative uncertainty of pressure measurement ( k = 2) was 0.128 p . The vapor pressures of Se and SeO 2 were fitted to Antonie equation, respectively, and compared with the available literature data.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2018
·
IF 2.631
Ting Zheng,Jiaojiao Fang,Qinglong Xie,Zhenyu Wu,Meizhen Lu,Fan Xia,Dongshun Deng,Yong Nie,Jianbing Ji
Fatty acid 2-ethylhexyl esters are used for the eco-friendly production of biolubricant. There are several reports on their synthesis, but thermodynamics and transport data of these compounds are lacking. Herein, density and viscosity of palmitic acid 2-ethylhexyl ester, stearic acid 2-ethylhexyl ester and soya oil 2-ethylhexyl esters in the temperature range of T = (298.18–368.15) K at atmospheric pressure were measured and the vapor pressure in the temperature range of T = (476.95–500.85, 477.05–498.05, 477.75–500.05) K was determined. The obtained experimental data were correlated using temperature-dependence correlation equations, and the correlation coefficients of all the equations were over 0.999. In order to examine the reliability of the data, the GCVOL group method was used to evaluate densities for these fatty acid 2-ethylhexyl esters with the maximum relative deviation of −1.34%. The experimental viscosity data of synthesized 2-ethylhexyl esters were compared with those of lauric acid 2-ethylhexyl ester, palmitic acid n-octyl ester and oleic acid 2-ethylhexyl ester from previous studies. In addition, the molar enthalpy of vaporization at the mean temperature of the experimental range was calculated for the first time using the Clausius-Clapeyron equation.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Zhixian Huang,Haiming Jiang,Ling Li,Hongxing Wang,Ting Qiu
The properties of ethyl trifluoroacetate (CF 3 COOCH 2 CH 3 ) were measured as a function of temperature: density (278.08 to 322.50) K, viscosity (293.45 to 334.32) K, saturated vapor pressure (293.35 to 335.65) K. The density data were fitted to a quadratic polynomial equation, and the viscosity data were regressed to the Andrade equation. The correlation coefficient ( R 2 ) of equations for density and viscosity are 0.9997 and 0.9999, respectively. The correlation between saturated vapor pressures and temperatures was achieved with a maximum absolute relative deviation of 0.142%. In addition, the molar evaporation enthalpy in the range of T = (293.35 to 335.65) K was estimated by the Clausius–Clapeyron equation.
研究领域:
化学
·
热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Linmao Tang,Yuan Guo,Zuoxiang Zeng,Weilan Xue
The density and liquid heat capacity of propyl cinnamate were measured in the temperature range from 290.15 to 503.15 K by a pycnometer and automatic adiabatic calorimeter and correlated with temperature by the linear equation and quadratic polynomial, respectively. Vapor pressure data of propyl cinnamate were determined by the ebulliometric method at 419.15–559.15 K, and they are in accordance with the Antoine equation. The vaporization enthalpy ΔvapH (Tb) of propyl cinnamate at normal boiling point was attained based on the Clausius–Clapeyron equation. The standard enthalpy of vaporization ΔvapH (298.15 K) was calculated by the Othmer method and verified by the Watson relation.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Jumei Xu,Yu Qi,Zuoxiang Zeng,Weilan Xue
The density and the heat capacity of (E,E)-methyl sorbate (MS) were measured from 286.35 to 433.25 K using a pycnometer and an adiabatic calorimeter, respectively. The saturated vapor pressure of MS was determined by the ebulliometric method from 344.95 to 455.15 K and correlated by the Antoine equation with an average relative deviation of 1.68%. The enthalpy of vaporization of MS at the normal boiling point was figured out to be 44.29 kJ mol–1 according to the Clausius–Clapeyron equation. Based on the Othmer method, the standard enthalpy of vaporization of MS was obtained using three substances as a reference, and the calculated results were further verified by the Watson relation and the Clarke–Glew equation.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Wang Xiangnan,Liu Tao,Yu Jingkun
(4YSZ) 0.93 (Fe 2 O 3 ) 0.07 and 9 mol% Y 2 O 3 stabilized ZrO 2 (9YSZ) were synthesized by co-precipitation method and their crystalline structure, microstructure, electronic conductivity, total conductivity were characterized. A limiting current oxygen sensor was assembled with (4YSZ) 0.93 (Fe 2 O 3 ) 0.07 dense diffusion barrier and 9YSZ solid electrolyte by Pt sintered-paste method. Influences of temperature ( T ), oxygen concentration ( x (O 2 )) and water vapor pressure ( p (H 2 O)) on sensing characteristics of the limiting current oxygen sensor were investigated. The crystalline structure of (4YSZ) 0.93 (Fe 2 O 3 ) 0.07 and 9YSZ belong to cubic structure with \({\bf{Fm}}\overline{{\bf{3}}}{\bf{m}}\) . The total conductivity of (4YSZ) 0.93 (Fe 2 O 3 ) 0.07 is higher than that of 9YSZ and the electronic and total conductivities of the samples meet the linear relationship with 1000/ T . The limiting current oxygen sensor exhibits excellent sensing characteristics under test conditions. The effects of T , x (O 2 ) and p (H 2 O) are as follows: Log( I L · T ) depends linearly on 1000/ T , I L depends linearly on x (O 2 ) and I L is not significantly dependent on p (H 2 O).
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2023
·
IF 3.5
Ningrui Zhao,Jumei Xu,Zuoxiang Zeng,Weilan Xue
The density of (E)-isobutyl cinnamate at 297.95–535.20 K was measured using a capillary pycnometer and linearly related to temperature. The vapor pressure of (E)-isobutyl cinnamate at 420.15–570.05 K was measured by the ebulliometric method, and correlated by Antoine equation with an average relative deviation of 1.11 %. The vaporization enthalpy Δ vap H (T b ) of (E)-isobutyl cinnamate at normal boiling point was obtained based on the Clausius-Clapeyron equation. The standard vaporization enthalpy Δ vap H (298.15 K) was calculated to be 73.67±0.5 kJ·mol −1 by Othmer's method and verified by the Corresponding State Group Contribution (CSGC) method. The heat capacities at saturation vapor pressure ( C SL ) of (E)-isobutyl cinnamate were measured at 298.15–533.15 K by an automatic calorimeter and correlated by a quadratic polynomial.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2018
·Vol. 47
·期 3
·544-559
·
IF 1.401
Li Dan,Wu Qian,Liu Li,Guo Meng,Wang Huiqin
Measurements of density, viscosity and vapor pressure for binary mixtures of exo -tetrahydrodicyclopentadiene (JP-10) with isopropyl ether are reported at temperatures of (293.15, 298.15, 303.15, 308.15, and 313.15) K over the entire composition range. The excess molar volumes, viscosity deviation and excess Gibbs energies of activation for the binary systems were calculated from the experimental values and fitted with the Redlich–Kister equation. Isopropyl ether was added to enhance the vapor pressure of JP-10. Experimental vapor pressure data were correlated by the Antoine equation. Several semi-empirical equations were used to correlate the viscosity data. The McAllister equation gives relatively satisfactory results for the correlation. The experimental and correlated data could be used in the development of models for mixtures of hydrocarbons with oxygenates.
研究领域:
物理化学
·
流体性质
·
燃料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 108
·106625-106630
·
IF 3.289
Yonggang Liu,Weikun Wang,Anbang Wang,Zhaoqing Jin,Hailei Zhao,Yusheng Yang
Sulfurized polyacrylonitrile (S@pPAN) composites have been synthesized in a high pressure reactor under certain vapor pressure. According to elemental analysis, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS), the hydrogen content and the degree of graphitization in S@pPAN composites decreases with increasing synthesis vapor pressure, indicating that a suitably high vapor pressure is helpful in promoting the reaction between polyacrylonitrile and elemental sulfur and finally making the conductive molecular structure of sulfurized polyacrylonitrile more complete. The results show that the sulfurized polyacrylonitrile composite prepared under 5 MPa vapor pressure (S@pPAN-5) delivers a high initial discharge specific capacity of 1821 mA h g−1 and the capacity remains at 1357 mA h g−1 (616.8 mA h gcomposite−1) after 100 cycles with a retention rate of 88% calculated from the 2nd discharge capacity.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Xueyan Yang,Siman Ren,Yuwei Wang,Gan Yang,Yueyang Li,Chuang Li,Lihong Wang,Lei Yao,Lin Wang
Evaluating the volatility of organic compounds based solely on their molecular formulas would avoid tough demands in deriving molecular structures. Here, we deployed an iodide-adduct Long Time-of-Flight Chemical Ionization Mass Spectrometry (LToF-CIMS) combined with a Filter Inlet for Gases and AEROsols (FIGAERO) to investigate molecular formulas and thermograms of organic compounds on ambient particulate samples collected in the summer of 2021 in a suburban site of Shanghai and to estimate saturation vapor pressures of low- and semivolatile components of ambient organic aerosols. Then, a hierarchical cluster analysis and a subsequent classification of obtained clusters by similarity calculation were applied to the measured data set of molecular formulas and saturation vapor pressures of organic aerosols with at least a 2/3 appearance frequency, together with a similar data set collected at a rural site in the Beijing–Tianjin–Hebei region during the winter of 2018 (Ren et al., 2018), to classify all compounds into multiple groups. For each group of compounds, parametrizations between volatility and elemental composition were derived, and then relationships between each group of parameters and the mean O:C were established to achieve a volatility-molecular formula parametrization with the O:C as a key input. Statistical comparison of estimated volatilities of low-volatile organic compounds shows a much better performance of our parametrization than previous molecular formula-based ones.
研究领域:
环境科学
·
大气化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Jinyi Chen,Hongxing Wang
Density and viscosity data of pure 3-chloro-4-fluoronitrobenzene and 3-chloro-2-fluoronitrobenzene were obtained in temperature range from 318.15 K to 348.15 K at the local atmospheric pressure of 99.7 kPa. The value of corresponding saturated vapour pressure of two isomers were determined in the temperature range of 409 K to 517 K. The relationship between temperature and density can be well correlated by the linear equation. The viscosity data was well described by the Litovitz, Ghatee, VFT, and Andrade equations, and the calculated value by the VFT equation is consistent with the measured data. Both the Antoine and Riedel equations can accurately describe the relationship between saturated vapour pressure and temperature of 3-chloro-4-fluoronitrobenzene and 3-chloro-2-fluoronitrobenzene, which can meet the requirements for chemical design. In addition, the thermal expansion coefficient was determined based on the density data, and the molar vaporisation enthalpy of two isomers was evaluated using the Clausius-Clapeyron equation.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）