PHYSICS AND CHEMISTRY OF LIQUIDS
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2019
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IF 1.526
Mengsha Cai,Zhaoshan Liu,Haiyun Sun,Yongsheng Guo,Wenjun Fang
Densities (ρ) and viscosities (η) of a ternary system cyclopropanemethanol (1) + 2,2,4-trimethylpentane (2) + decalin (3) and three corresponding binary systems were measured at temperatures from 293.15 K to 323.15 K and atmospheric pressure. Densities were obtained by using a vibrating-tube densimeter. Viscosities were determined by an automatic microviscometer based on the rolling ball principle. The excess molar volumes (VmE) and viscosity deviations (Δη) of the ternary system were derived from the experimental data and then were fitted to Clibuka, Nagata–Tamura and Redlich–Kister equation, respectively. The binary subsystems were correlated by Redlich–Kister equation. The values of VmE and Δη were used to discuss the nature of mixing behaviours between mixture components.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2018
·Vol. 135
·期 6
·3363-3373
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IF 2.209
Zhang Shijie,Zhang Jiaoqiang,Kou Kaichang,Jia Qian,Xu Yunlong,Zerraza Sofiane,Liu Ning,Hu Rongzu
2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexazisowurtzitane (HNIW)·1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) co-crystal in a 2:1 molar ratio was prepared by a solvent/non-solvent method, and the co-crystal has been characterized by several methods. The enthalpies of dissolution of 2HNIW·HMX co-crystal in N,N -dimethylformamide at different temperatures were measured by a DC08-1 Calvet microcalorimeter under standard atmospheric pressure, and it is indicated that the dissolutions are exothermic process. The empirical formulae for the calculation of the molar enthalpy ( \(\Delta_{\text{diss}} H\) ) of dissolution, relative partial molar enthalpy ( \(\Delta_{\text{diss}} H_{\text{partial}}\) ), relative apparent molar enthalpy ( \(\Delta_{\text{diss}} H_{\text{apparent}}\) ), and enthalpy of dilution ( \(\Delta_{\text{dil}} H_{1,2}\) ) at 298.15 K are obtained. The differential enthalpies ( \(\Delta_{\text{dif}} H\) ) and kinetic equations describing the dissolution process at different temperatures are deduced. Furthermore, the apparent activation energy E = 10.54 ± 0.22 kJ mol -1 and pre-exponential constant A = 0.34 ± 0.03 s −1 of 2HNIW·HMX co-crystal are obtained. The standard molar Gibbs free energy of activation ( \(\Delta G_{ \ne }^{\theta }\) ) at different temperatures is 86.44 ± 0.02 kJ mol −1 (298.15 K), 88.02 ± 0.03 kJ mol −1 (303.15 K), 89.61 ± 0.01 kJ mol −1 (308.15 K), 91.18 ± 0.01 kJ mol −1 (313.15 K), and 92.75 ± 0.02 kJ mol −1 (318.15 K), respectively. The standard molar entropy of activation ( \(\Delta S_{ \ne }^{\theta }\) ) and standard molar enthalpy of activation ( \(\Delta H_{ \ne }^{\theta }\) ) are − 262.55 ± 0.72 J mol −1 K −1 and 7.98 ± 0.22 kJ mol −1 , respectively.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2013
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IF 2.004
Xiaopo Wang,Kai Kang,Wei Wang,Yuansi Tian
Experimental density data of the binary mixtures of 3-(methylamino)propylamine with water, N-methyldiethanolamine, N,N-dimethylethanolamine and N,N-diethylethanolamine were reported at atmospheric pressure over the entire composition range at temperatures from (283.15 to 363.15) K. The densities were measured using an Anton Paar digital vibrating U-tube densimeter. Excess molar volumes of the mixture were calculated from the experimental densities and correlated as the Redlich–Kister equation. The optimized sets of parameters of the equation were obtained by the least-squares method at each temperature. Infinite dilution partial molar volumes and the corresponding excess partial molar volumes at infinite dilution were calculated and discussed. Thermal expansivities for the binary mixtures were presented.
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FLUID PHASE EQUILIBRIA
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2015
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IF 2.2
Yang Yang,Qi Zhang,Yonghong Hu,Yonglan Li,Wenge Yang,Cuicui Cao,Limin Cheng
Data on corresponding solid–liquid equilibrium of mercaptosuccinic acid is essential for a preliminary study of industrial applications. In this paper, we focused on solubility and solution thermodynamics of mercaptosuccinic acid. By gravimetric method, the solid–liquid equilibrium of mercaptosuccinic acid was measured in (methanol + ethyl acetate) binary solvent mixtures from 278.15 K to 333.15 K under atmosphere pressure. The solubility data were then modeled using modified Apelblat equation, a variant of the combined nearly ideal binary solvent/Redich–Kister (CNIBS/R–K) model and Jouyban–Acree model. Computational results showed that the modified Apelblat equation and CNIBS/R–K model have the low MD (mean deviation). In addition, the thermodynamic properties of the solution process, including the Gibbs energy, enthalpy, and entropy were calculated by the van’t Hoff analysis.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2013
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IF 2.004
Zhicheng Xu,Shujuan Wang,Changhe Chen
Densities of and N2O solubilities in aqueous solutions of 1,4-butanediamine (BDA), 2-(diethylamino)-ethanol (DEEA), and their aqueous mixtures were measured at (298.15, 313.15, and 333.15) K, and viscosities were measured at (298.15, 303.15, 313.15, 323.15, and 333.15) K. The experiments cover the mole fraction ranges (1.95–14.3 mol %) BDA, (2.01–19.3 mol %) DEEA, and (3.63–16.7 mol %) BDA + (2.62–22.2 mol %) DEEA in the blended solutions. The results were compared with available data in the literature. The experimental density and viscosity data were correlated using two semi empirical correlations in the literature as functions of temperature and concentration of BDA and DEEA.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
·
IF 1.835
Xiaohong Han,Zhangzhang Yang,Zanjun Gao,Wenjie Guan,Guangming Chen
Fluoroethane (HFC-161) is one of the most promising alternative refrigerants because of its excellent environmental and thermodynamic properties. It was considered as one of the most promising absorption working fluids in the absorption refrigeration. To make a better application of the refrigerant in absorption refrigeration systems, suitable absorbents should be selected for matching HFC-161. Vapor–liquid equilibrium (VLE) data is the key of the chemical engineering simulation and the refrigeration cycle calculation. On the basis of these, the vapor–liquid equilibrium data for the mixture of HFC-161 + dimethyl ether triethylene glycol were obtained at temperatures from 293.15 to 353.15 K by using a recirculation apparatus. The VLE data were then correlated by the Peng−Robinson (PR) equation of state combined with the modified Huron-Vidal first order (MHV1) mixing rule and nonrandom two liquid (NRTL) model. The experimental results had a good consistency with calculated values. Phase behaviors of HFC-161 combined with different absorbents were compared in this paper.
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 45
·10654-10663
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IF 5.066
Longhui Zheng,Guozheng Liang,Aijuan Gu,Li Yuan,Qingbao Guan
High loading of ceramics has been the biggest shortcoming of fabricating high-k ceramic/polymer composites. Herein, unique pure barium titanate (BT) foams with three-dimensional interconnecting foam channels, coded as BTFs, were synthesized using a polymer foam replication method, and the BT content of foams is adjustable. In addition, various loadings of BTF were embodied into cyanate ester (CE) resin to develop a new kind of high-k composite. The spatial structure and content of BTF on the thermal and dielectric properties of BTF/CE composites were systematically researched, and compared with those of traditional composites based on commercial BT powders and ground BTF powders (BTFp), respectively. The results show that BTF/CE composites exhibit a much higher dielectric constant at very low concentrations of BTF than those of BT/CE and BTFp/CE composites. Typically, when the BTF content is as low as 33.5 vol%, the dielectric constant of the resultant BTF6(1200)/CE composite reaches 141.3 (100 Hz), about 8.4 and 14.1 times of those of traditional BT/CE and BTFp/CE composites, respectively; in fact, the BTF6(1200)/CE composite has the highest dielectric constant among non-semiconductive ceramic/polymer composites reported to date; meanwhile the dielectric loss of BTF6(1200)/CE is only about 0.276. The nature behind the excellent dielectric properties of BTF/CE composites was intensively discussed and proven to be attributed to the unique three-dimensional foam structure of BTF in CE resin. This study establishes a new method of preparing novel foam ceramics with three-dimensional interconnecting foam channels and a pure high-k ceramic skeleton as well as high-k ceramic/polymer composites with good processing characteristics at a very low loading of ceramics.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
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IF 1.835
Ying Zhang,Xiong Zheng,Maogang He,Yutian Chen
Ethers are usually used as gasoline additives, and now 2-methoxy-2-methylpropane (MTBE) is the most widely used fuel additive. The speed of sound in MTBE with a specified mass purity higher than 0.990 (GC) was measured by the Brillouin light scattering method in the temperature range of 293.15–673.15 K and for pressures up to 10 MPa, including saturated liquid/vapor, liquid, and supercritical fluid. The correlations for the speed of sound in saturated liquid/vapor and liquid were proposed by employing the experimental results. Comparing the calculated results with the experimental data, the average absolute deviations are 0.50% for saturated liquid, 0.20% for saturated vapor, and 0.24% for liquid. The tendency of speed of sound to temperature and pressure was also analyzed.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Zhao-Lei Huo,Jia-Yu Qiao,Le-Xi Zhang,Yao-Wen Yue,Qi-Da Qiu,Zhi-Jiang Hou,Jing Yin,Li-Jian Bie
Nowadays, attractive progress has been made on flexible humidity sensors for multifunctional applications, yet most of them still suffer from intrinsic instability due to the device structure based on flexible substrates. Herein, high-performance flexible humidity sensors were constructed using alkali metal halide doped polyvinylpyrrolidone (PVP)/polyvinylidene fluoride (PVDF) freestanding films. These films are prepared via a versatile thermally induced phase separation procedure with a network-like porous structure. After doping with metal salts of MCl (M = Li, Na, K), the humidity sensing performance is highly improved, among which the LiCl@PVP/PVDF film is the optimized one. In the relative humidity range of 11–97% at room temperature, the LiCl@PVP/PVDF sensor exhibits high response (2.3 × 103), fast response (10 s), small hysteresis (0.41%), and excellent repeatability. Notably, the LiCl@PVP/PVDF film is featured as fully self-supporting without the assistance of any substrate, readily tailorable that can be cut into different shapes, as well as highly flexible that can be bent to certain angles, and meanwhile almost maintains its response without significant decrease. Furthermore, the excellent performance enables the LiCl@PVP/PVDF sensor to demonstrate great potential in real-time noncontact diaper and finger detection. This contribution provides a practical humidity sensing candidate for moisture monitoring and gives insights into the fields of humidity sensors and flexible electronics.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Bin Ou,Lemei Huang,Shi Su,Yanyan Huang,Zhijia Wang,Xiaobing Liu,Kui Wu
In this work, the solid–liquid equilibrium solubility and the impact of different solvents on 2-aminopyrimidine were explored across 17 distinct single-solvent systems, including methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, ethyl acetate, butanone, 2-pentanone, acetone, acetonitrile, ethyl formate, methyl acetate, cyclopentanone, and cyclohexanone, at atmospheric pressure and temperatures ranging from 272.65 to 323.35 K. It was observed that in all these solvents, solubility increases as the temperature rises. At 298.15 K, the molar solubility sequence in the solvents is as follows: cyclopentanone > cyclohexanone > ethyl formate > methanol > ethyl acetate > butanone > methyl acetate > acetone > n-propanol > ethanol > 2-pentanone > n-butanol > isobutanol > isopropanol > isopentanol > n-pentanol > acetonitrile. The solubility data obtained from experiments were fitted using four models: the modified Apelblat model, the Buchowski–Ksiazaczak λh model, the NRTL model, and the Wilson model, all of which demonstrated a good fit. The modified Apelblat model yielded the most accurate correlations, as indicated by the lowest average ARD and RMSD values. Furthermore, using the Wilson model, the thermodynamic properties of the mixing process of 2-aminopyrimidine in the chosen solvents were calculated, revealing that the mixing was spontaneous and primarily driven by entropy. The results of this study provide valuable insights for the purification, crystallization, and industrial application of 2-aminopyrimidine and similar compounds.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2025
·
IF 2.1
Jiyuan Zhang,Guojun Ji,Rui Cao,Bo Zhang,Qiang Li,Jianbin Zhang
Density and viscosity properties of 2-propoxyethanol (2-PE) + 3-diethylamino propylamine (DEAPA) mixed solutions were investigated at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K and P = 100.5 kPa. After that, density was fitted well by the least-squares method, and viscosity was fitted well by the Arrhenius equation. According to basic data of density and viscosity, the excess properties and thermodynamic quantities of the mixed solutions were calculated, which indicated that an intermolecular interaction between 2-PE and DEAPA existed. Furthermore, computational chemistry and spectral analyses are used to explore the types of intermolecular interaction forces. Through computational chemistry, the most stable configurations of two organic single molecules and (2-PE + 2-PE, DEAPA + DEAPA, and 2-PE + DEAPA) bimolecules were optimized, and the hydrogen bond (HB) between the molecules was inferred. Through spectral analyses, Raman and 1H NMR spectra were respectively used to characterize the (2-PE + DEAPA) mixed solutions. The hydrogen bonding mechanism was further found to be consistent with computational chemistry. Subsequently, based on the molar ratio of the strong intermolecular interactions, the (2-PE + DEAPA) mixed solutions presented a strong absorption capability of 0.6382 mol of CO2/mol of DEAPA for CO2 fixation at 150 min.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Hao Li,Fengyi Zhang,Qianlong Zhang,Hongjuan Li,Zhiying Wang,Chunli Li,Jing Fang
For some strongly non-ideal solution systems, there are often errors in predicting the phase equilibrium relationship of a multi-component system using the interaction parameters obtained by the regression of the phase equilibrium data of the binary system. The interaction parameters between the components obtained by directly determining the phase equilibrium of the multivariate system will bring the calculated values closer to the experimental values. Liquid–liquid equilibrium (LLE) data were determined for the system of n-butanol + n-pentanol + n-hexanol + water at 313.15, 323.15, and 333.15K under atmospheric pressure. LLE compositions were determined by gas chromatography. LLE data were correlated by the UNIQUAC model and the non-random two-liquid (NRTL) model. Both models were appropriate for describing the LLE of this quaternary equilibrium system. They provided accurate thermodynamic parameters for the phase equilibrium of C4–6 mixed alcohols in Fischer–Tropsch synthesis water.
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