JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Rongrong Li,Anguo Ying,Guobo Huang,Chenghong Li,Dan Chen,Jia Zhao
The solubility of sodium 3-sulfobenzoate in binary (sodium chloride + water), (sodium sulfate + water), and (ethanol + water) solvent mixtures was measured at elevated temperatures from (278.15 to 323.15) K by a steady-state method. The results of these experiments were correlated by a modified Apelblat equation. The dissolution enthalpy and entropy of sodium 3-sulfobenzoate in aqueous solutions of different mole fraction were obtained.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Xiong Zheng,Ying Zhang,Maogang He,Lili Liang,Xinxin He
Fatty acid ethyl esters (FAEEs) are the main components in some biodiesels, which are important alternatives of fossil fuels. In this paper, we carry out the measurements of the speed of sound in two FAEEs at the temperatures from (293.15 to 473.15) K and at the pressures up to 10 MPa, including saturated liquid and compressed liquid. The relative expanded uncertainty in the speed of sound is estimated to be less than 1.0% with coverage factor of k to be 2. The data in saturated liquid and compressed liquid are fitted into polynomials. For saturated liquid, the D AAD is 0.16% for ethyl hexanoate and 0.09% for ethyl octanoate. For compressed liquid, the D AAD is 0.31% for ethyl hexanoate and 0.16% for ethyl octanoate. The data were also used to assess the predictive ability of Wada’s model.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 15
·3175-3184
·
IF 5.066
Chunxi Xu,Li Yuan,Guozheng Liang,Aijuan Gu
Sustainability urgently asks for low dielectric loss and a low percolation threshold (fc) while developing high dielectric constant (Hi-k) conductor/polymer composites. In this work, a novel hybridized graphene (PIL–TrGO) was first reported using a two-step process, including the decoration of an epoxy functionalized ionic liquid (IL) on the surface of thermally reduced graphene oxide (TrGO) through πcation–π interaction, followed by in situ polymerization of the IL. The DC conductivity of the PIL–TrGO hybrid is as good as that of TrGO. Then, different loadings of PIL–TrGO were added into cyanate ester (CE) to prepare a series of composites; the TrGO/CE composites were also prepared for comparison. Different from TrGO, the PIL has a large amount of epoxy groups, which guarantees good dispersion of the hybridized graphene in CE matrix, and thus provides the base for transferring the outstanding electrical properties of graphene to the composites. When the loading of fillers approaches the percolation threshold (fc), the dielectric constant and loss at 100 Hz of PIL–TrGO/CE composites are about 13 and 0.57 times that of TrGO/CE composites, respectively, while the fc of PIL–TrGO/CE composites is still as low as 0.94 wt%. The dielectric mechanism was studied by discussing and simulating impedance spectra, and the results show that PIL–TrGO/CE composites possess more micro-capacitor structures than TrGO/CE composites; moreover, the cation–anion charge layers on TrGO surfaces enhance the Maxwell–Wagner–Sillars polarization between PIL–TrGO hybrid and the CE matrix, and then markedly increase the dielectric constant of composites. PILs coated on graphene surfaces act as electron insulative layers and thus decrease dielectric loss induced by the leakage current between conductive carbon layers.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHARMACY AND PHARMACOLOGY
·
2016
·Vol. 68
·期 9
·1109-1118
·
IF 2.363
Yang Lei,Xin Jin,Zhang Zhenhai,Yan Hongmei,Wang Jing,Sun E,Hou Jian,Jia Xiaobin,Lv Huixia
ObjectiveThis work aimed at preparing ginsenoside compound K (GCK)-loaded liposomes modified with TPGS (GCKT-liposomes) to enhance solubility and targeting capability of GCK, as well as inhibit the efflux of GCK from tumour cells.MethodsGCKT-liposomes were prepared by the thin-film hydration method and characterized by particle size, polydispersity, zeta potential and drug encapsulation efficiency. A549 cells were used as antitumour cell model to access the cellular uptake of the GCK and perform its antitumour function. The enhancement of in vivo antitumour efficacy of GCKT-liposomes was evaluated by nude mice bearing tumour model.Key findingsThe results showed that GCKT-liposomes achieved a comparatively high drug loading efficiency and reasonable particle size at the ratio of 7 : 3 (phospholipid: TPGS). The in vitro release demonstrated that the dissolution of GCK was remarkably improved by entrapping it into liposomes. In addition, GCKT-liposomes exhibited a great hypersensitizing effect on A549 cells, and the cellular uptake was enhanced. Compared with free GCK, the IC50 of GCKT-liposomes was significantly reduced (16.3 ± 0.8 vs 24.9 ± 1.0 μg/ml). In vivo antitumour assay also indicated that GCKT-liposomes achieved higher antitumour efficacy (67.5 ± 0.5 vs 40.8 ± 0.7%).ConclusionThe novel GCKT-liposomes significantly improved the antitumour efficacy of GCK.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 55
·50173-50179
·
IF 3.289
Song Li,Song Ye,Tianhua Liu,Zhuang Guo,Huiyun Wang,Deping Wang
ZnO quantum dots (QDs) with tunable size and photoluminescence can be achieved simply by controlling their growth during the sol–gel synthesis process. However, the role of alkali metal hydroxide MOH (M = Li, Na or K) as the reactant in the growth of ZnO QDs is still controversial. In this work, we carried out a comprehensive study on the growth of ZnO QDs by using different types of MOH as the reactant under different reaction temperatures and in different solvents. The results reveal that the growth of ZnO QDs is considerably governed by MOH through the co-effect of OH− and M+ ions, which can facilitate and hinder the growth, respectively. Further investigations suggest that the hindering effect caused by M+ cations is strongly dependent on the amount of OH− anions around the ZnO QD surface and follows the trend of Li+ > Na+ > K+. Moreover, the dual role of the reactant MOH can also be confirmed when altering reaction temperature and solvent. The photoluminescence of ZnO QDs shows size-dependence and can be easily tuned over a wide range from purple to yellow via adjusting the reaction parameters. This research establishes a fundamental understanding on the growth of ZnO QDs from the role of the reactant MOH point of view, which may benefit the controllable growth of ZnO QDs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Hongyue Guo,Botao Yu,Xiaofei Wang,Qingsong Li
To separate the azeotropic system of 2-methyl-2-butanol and water, the liquid–liquid equilibrium (LLE) data of water + 2-methyl-2-butanol + solvents (methyl tert-butyl ether (MTBE), isopropyl ether, isooctyl alcohol, methyl acetate, mesityl oxide, and 4-methyl-2-pentanol (MIBC)) were measured at 308.2 K under 101.3 kPa. All systems conform to Treybal’s type II ternary phase behavior, with water + solvents and water + 2-methyl-2-butanol being partially miscible binary mixtures, while 2-methyl-2-butanol + solvents are miscible binary mixture. The distribution coefficient (D) and selectivity coefficient (S) were employed to evaluate solvent performance for extracting 2-methyl-2-butanol from water. Intermolecular interactions between 2-methyl-2-butanol and both solvents and water were investigated by using the DMol3 module. The nonrandom two-liquid (NRTL) and universal quasi-chemical (UNIQUAC) models were applied to correlate LLE data, obtaining binary interaction parameters with root-mean-square deviations (RMSDs) < 0.60%. The consistency of regression parameters for both models was validated using the GUI-MATLAB tool.
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Kai Kang,Xiaopo Wang,Fuxin Yang,John M. Prausnitz
Experimental density data are reported for diethylene glycol monobutyl ether, diethylene glycol dibutyl ether, and ethylene glycol monobutyl ether from (283.15 to 363.15) K at pressures up to 60 MPa using a vibrating-tube densimeter. Relative uncertainties of density measurements are 0.001 with confidence level 0.95. The experimental data were fitted with a Tait-like equation; average relative deviations were 0.017% for diethylene glycol monobutyl ether, 0.015% for diethylene glycol dibutyl ether, and 0.019% for ethylene glycol monobutyl ether. The isobaric thermal expansivity and the isothermal compressibility were derived from the Tait-like equation.
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2012
·
IF 1.805
Yang Lu,Juan Han,Chengzhuo Sheng,Ping Yu,Zhenjiang Tan,Yongsheng Yan
The phase diagrams for the systems containing polyoxyethylene (10) lauryl ether (POELE10) and three salts (KOH, K 2 CO 3 and K 3 PO 4 ) have been determined experimentally. Three experiential equations were used to correlate the binodal data. The liquid–liquid equilibrium data of these systems were obtained by experimental method and calculated method using lever rule. The tie-line data were correlated by using Othmer-Tobias and Bancroft and simple Setschenow-type equations. Furthermore, the effect of salt on the binodal curve for the studied systems has been discussed by means of salting-out coefficient, effective excluded volume (EEV) and Gibbs free energy of hydration of the ions (Δ G hyd ). It was found that the salts composed of anion with a higher valence are better salting-out agents than those with a lower valence. The order of salting-out abilities of salts is K 3 PO 4 > K 2 CO 4 > KOH for the investigated systems. Finally, the phase-separation ability of POELE10 is more powerful compared with that of other polymers and two-phase can easily form at the lower concentration, which indicates that lower cost is a remarkable advantage of POELE10–salt ATPSs.
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2015
·
IF 2.2
Qi Zhang,Yonghong Hu,Yang Yang,Cuicui Cao,Limin Cheng,Ying Shi,Wenge Yang
In this paper, we focused on solubility and solution thermodynamics of dibenzothiophene . By gravimetric method , the solubility of dibenzothiophene was measured in (formic acid + butan-1-ol) binary solvent mixtures from 278.15 K to 333.15 K under atmosphere pressure. The solubility data were fitted 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 was superior to the other two equations. In addition, the thermodynamic properties of the solution process, including the Gibbs energy , enthalpy, and entropy were calculated by the van't Hoff analysis. The experimental results showed that formic acid could be used as effective anti-solvents in the crystallization process .
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Rongrong Li,Hao Chen,Huayue Zhu,Ru Jiang,Stephen Louis Romano,Xiaoying Chen,Deman Han
The equilibrium solubility of sodium 2-naphthalenesulfonate in binary (sodium chloride + water), (sodium sulfate + water), and (ethanol + water) solvent mixtures was measured at elevated temperatures from (278.15 to 323.15) K using a steady-state method. With increasing temperatures, the solubility increases in aqueous solvent mixtures. The results of these results were regressed by a modified Apelblat equation. The dissolution entropy and enthalpy determined using the method of the least-squares and the change of Gibbs free energy calculated with the values of Δ diff S o and Δ diff H o at T = 278.15 K.
✓ 已验证
DOI
高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2018
·
IF 1.144
Miao Shiding,He Shuai,Xue Yuli,Nian Hongen,Wang Jian,Zhang Peng,Zhu Fujie,Wen Wanglin
Food grade (K2CO3 wt.%>99.0%, GB/T 25588-2010) potassium carbonate (K2CO3) has been extracted from low concentration [K+] solutions of K2CO3-Na2CO3-H2O,
which refers to a subsystem of brine water in the Lop Nor Lake in West China. Procedures of the isothermal evaporation, crystallization, CO2 acidification, filtration, and calcination were employed to prepare the K2CO3. This research focuses on the phase study
of metastable equilibria between K2CO3-Na2CO3-H2O and KHCO3-NaHCO3-H2O. The solubility, density, conductivity, and pH values were determined. Phase diagrams were plotted at temperatures of 298.2 and 313.2
K. At 298.2 K the ternary system of K2CO3-Na2CO3-H2O was found to have double salts in form of solid solutions Na2CO3·K2CO3·(6–12)H2O, which would hinder the process
of getting pure K2CO3 by the means of isothermal evaporation. In this protocol the high-pressure CO2 was charged to the ternary carbonate solution, and the K2CO3-Na2CO3-H2O was moved to bicarbonate system
KHCO3-NaHCO3-H2O. This quaternary system is of a simple co-saturation type of diagram, in which a solid solution (KHCO3·NaHCO3) was found to be greatly affected by temperatures. This finding affords efficient separation of KHCO3
from the KHCO3-NaHCO3-H2O solutions.
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2024
·
IF 2.2
Yufeng Tang,Qichao Yang,Zhanping Qiao
The phase equilibrium of ternary systems RbX/CsX + CuX 2 + H 2 O (X = Cl, Br) at T = 298.15 K were investigated by the isothermal dissolution equilibrium method, in which the composition of equilibrium solid phases was determined by the Schreinemaker’s wet residue method. In the system RbCl + CuCl 2 + H 2 O, there were three crystallization regions corresponding to RbCl, Rb 2 CuCl 4 ·2H 2 O and CuCl 2 ·2H 2 O, respectively. Five crystallization fields corresponding to CsCl, CsCuCl 3 , Cs 3 Cu 2 Cl 7 ·2H 2 O, Cs 2 CuCl 4 and CuCl 2 ·2H 2 O were formed in the system CsCl + CuCl 2 + H 2 O. The ternary system RbBr + CuBr 2 + H 2 O had three crystalline regions corresponding to RbBr, Rb 2 CuBr 4 ·2H 2 O and CuBr 2 . In the system CsBr + CuBr 2 + H 2 O, the solid-phases of CsCuBr 3 , Cs 2 CuBr 4 , besides CsBr and CuBr 2 , were discovered. The results were compared with available literature data for cesium bromide/copper bromide salt-water system. The seven new solid phase were characterized using the X-ray diffraction method and thermogravimetric/differential analysis. The dissolution enthalpies of Rb 2 CuCl 4 ·2H 2 O, Rb 2 CuBr 4 ·2H 2 O, CsCuCl 3 , Cs 3 Cu 2 Cl 7 ·2H 2 O, Cs 2 CuCl 4 , CsCuBr 3 and Cs 2 CuBr 4 at T = 298.15 K were measured. Their standard enthalpies of formation were obtained, and the results were in order with −(1714.4 ± 3.2) kJ·mol −1 , −(1533.6 ± 3.3) kJ·mol −1 , −(697.8 ± 3.1) kJ·mol −1 , −(2418.9 ± 6.1) kJ·mol −1 , −(1134.8 ± 3.2) kJ·mol −1 , −(563.5 ± 3.2) kJ·mol −1 and −(966.2 ± 3.3) kJ·mol −1 , respectively.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）