JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
·
IF 2.6
Yan Feng,Shi-Hua Sang,Kuang-Yi Zhu,Chun-Tao Hu,Xiao-Feng Guo,Xiao-Tian Tan
The studies of mean activity coefficients of the NaBr–SrBr2–H2O solutions are of great significance for the development of underground brines in the Sichuan Basin of China. In this article, the mean activity coefficients of NaBr in the NaBr–SrBr2–H2O solutions have been studied by the cell potential method. The range of the determined ionic strength fraction yb of SrBr2 is 0.0, 0.2, 0.4, 0.6, and 0.8, and the total ionic strength I ranges from 0.0100 to 1.0000 mol·kg–1. First, the cell potentials of NaBr in NaBr–H2O solutions and NaBr–SrBr2–H2O solutions are measured by composite ion-selective electrodes. Then, the mean activity coefficients of NaBr in mixed solutions were calculated by using the measured cell potential data and the Nernst equation. Consequently, the mixed ion interaction parameters θNa+,Sr2+ and φNa+,Sr2+,Br– of the Pitzer model at 308.2 K were fitted by a multiple linear regression method. Finally, the above parameters and the Pitzer model were used to calculate the mean activity coefficients of SrBr2 and relevant thermodynamic properties (osmotic coefficient Φ, water activity aw, and excess Gibbs free energy GE) in NaBr–SrBr2–H2O solutions. In addition, the solubilities of NaBr and SrBr2 in mixed solutions were predicted using the Pitzer model. The predicted theoretical values are in good agreement with the experimental values. The fitted mixed ion interaction parameters have good applicability for solubility prediction.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2020
·Vol. 51
·期 4
·1339-1343
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IF 2.035
Ren Guoxing,Xiao Songwen,Liao Caibin,Xia Longgong,Liu Zhihong
The activity coefficient of CoO in SiO 2 -saturated MnO-SiO 2 slag was measured using metal-slag-gas equilibrium experiments under controlled oxygen potentials (10 −12 to 10 −10 atm) at 1623 K. The solubility of CoO in the slag increased with increasing oxygen potential and cobalt content in the alloy. The activity coefficient of cobalt oxide, γ CoO , referred to solid CoO, can be described as: γ CoO = 1.65 − 0.14 (wt pct CoO), where (wt pct CoO) represents the mass percent of CoO in the slag.
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FUEL PROCESSING TECHNOLOGY
·
2020
·
IF 4.982
Tiankai Zhang,Yongfa Zhang,Qi Wang,Xuemei Lv,Yunhuan Luo
In this paper, the changes in solid-phase carbon structure and the formation of carbon nanotubes in the process of K-catalyzed pyrolysis of bituminous coal were investigated. The results showed that the content of carbon nanotubes in K-catalyzed coal pyrolysis products increased with the extension of residence time. When the residence times were 0, 30 and 90 min, the yields of carbon nanotubes in the coal pyrolysis products were 1.98 wt%, 6.85 wt% and 10.16 wt%, respectively. It was found that the aromatic carbon C C, C H and ether carbon C-O-C structures in coal were the main carbon sources for the growth of carbon nanotubes. The probable growth mechanism of carbon nanotubes in the process of K-catalyzed coal pyrolysis was proposed to be as follows: aromatic C C and C H structures in coal convert K components such as K 2 CO 3 and K 2 O into metal K, and then metal K converts carbon atoms in the ether bond C-O-C structure into carbon atoms or clusters, which generate carbon nanotubes under the action of Fe catalyst particles in coal. This method provides a new strategy for the simultaneous high-value utilization of coal resources and macroscopic, low-cost preparation of carbon nanotubes.
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ChemNanoMat
·
2020
·Vol. 6
·期 5
·797-805
·
IF 3.384
Yu Hao,Shumin Zhang,Peng Tao,Tong Shen,Zijie Huang,Jingkai Yan,Yu Chen
Graphical A controllable amount of K + has been intercalated into V 2 O 5 layers to form stable K−O bonds between the V 2 O 5 layers, which works as the “pillar” to greatly enhance its structural stability. The“pillar effect”of the K−O bond can effectively inhibit the dissolution of vanadium-based oxides in the aqueous electrolyte, being crucial to the electrochemical performance of aqueous ZIBs. Aqueous zinc-ion batteries (ZIBs) have attracted widespread attention due to their advantages in safety and environmental benignity. However, achieving a cathode material with stable electrochemical performance for such a system remains an ongoing challenge. Herein, a K 0.5 V 2 O 5 cathode has been designed and synthesized by intercalating of K + into V 2 O 5 , thus constructing a stable crystal structure by forming chemical bonds between V 2 O 5 layers. The successful intercalation of K + has been confirmed by a series of experimental tests and Vienna Ab-initio Simulation Package simulation. These layer-interlinking chemical bonds act as “pillars” to strongly hold the V 2 O 5 layers together and protect them from dissolution. Furthermore, the K 0.5 V 2 O 5 electrode also exhibits excellent durability (about 150 mA h g −1 at 5 A g −1 after 3000 cycles). More impressively, even after standing for three days in the solution of 3 M ZnSO 4 electrolyte, the K 0.5 V 2 O 5 electrode still maintains a high capacity of 92.2 mA h g −1 after 150 cycles, demonstrating its outstanding stability and tolerance in such aqueous electrolyte.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Guangyu Xu,Fanyuan Zhang,Zhenghui Li
As a common solvent, water cannot dissolve flufenoxuron in this study well; therefore, methanol was added to the water to form a liquid mixture of different compositions. At first, the ratio of methanol mass was 90%, and then, it decreased by 10% until the methanol content was 10%. According to the above method, n-propanol, propylene glycol, and N,N-dimethyl formamide were made into corresponding mixed solvents. Under a pressure of 101.2 kPa, the temperatures of flufenoxuron and the solvent were kept at 278.15 K. Based on the basic principle of the static gravimetric method, the amount of solute diffusion in the above four mixed solvents was obtained. Other conditions remained unchanged, the temperature was increased by 5 K, and the above steps were repeated until the temperature was 323.15 K. There were two variables in the experiment; the temperature changes to a higher level and more flufenoxuron can be detected in the solution. Regardless of the change in temperature variables, the larger the mass of the organic solvent, the more solutes in the solution. Three models were employed to calculate the solubility of flufenoxuron. The maximum results of relative average deviation and the root-mean-square deviation were 0.43% and 4.24 × 10–4.
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Journal of Physical Chemistry C
·
2018
·
IF 4.484
Yingke Zhu,Hao Yao,Pingkai Jiang,Jiandong Wu,Xi Zhu,Xingyi Huang
Flexible dielectric materials with high electrical energy densities are of crucial importance in advanced electronics and electric power systems. The conventional methods for fabricating flexible dielectric materials with high electrical energy densities are introducing zero-, one-, and three-dimensional high-k inorganic nanofiller into a dielectric polymer matrix while less two-dimensional high-k nanofillers were included. Herein, two-dimensional (2D) high-k titanium dioxide nanosheets prepared by a one-step hydrothermal reaction were utilized to boost the energy storage performance of dielectric polymer nanocomposites. It was found that compared with the polymer matrix the nanocomposites not only exhibit an enhanced dielectric constant but also show suppressed dielectric loss, which is desirable for energy storage applications. The nanocomposite with 5 wt % 2D nanosheets exhibits a superhigh discharged energy density of 13.0 J/cm3 at 570 MV/m, which is nearly four times greater than that of commercialized biaxially oriented polypropylene (BOPP) (3.6 J/cm3 at 600 MV/m). In addition, nanocomposites with 5 wt % zero- and one-dimensional (0D and 1D) nanofiller are also fabricated for comparison. Results reveal that discharged energy densities of nanocomposites with 5 wt % 2D nanosheets are 236% and 382% higher than those of nanocomposites with 5 wt % 1D (5.5 J/cm3 at 400 MV/m) and 0D (3.4 J/cm3 at 300 MV/m) nanofiller, respectively. Finite element simulation was conducted to study the electric field distribution in nanocomposites with different shapes of nanofillers. Furthermore, the comparison of the current nanocomposites and previous reported nanocomposites with 0D, 1D, and 3D nanofillers shows that the 2D high-k nanofiller exhibited superior potential in advancing the energy storage nature of polymer nanocomposites. This remarkable exhibition of energy storage capability provides new insights into the development of high performance dielectric materials.
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SOLID STATE PHENOMENA
·
2018
·
IF 0
Li Qian Cheng,Mei Feng,Kai Chen
Single crystalline lead-free (K, Na)NbO3 (KNN) nanostructures have attracted much attention for the high piezoelectricity and environmental compatibility. Especially, the plate-like KNN structures are supposed to be utilized in the synthesis of textured KNN-based ceramics. The KNN plate-like templates were prepared by a two-step molten salt reaction. The layered-perovskite Bi2.5Na3.5Nb5O18 (BNN5) was first prepared by using Bi2O3, Nb2O5, Na2CO3, NaCl as raw materials. The BNN5 precursors possess high aspect ratio with an average size of 15 - 20 μm in width and 0.5 - 1 μm in thickness. Then Bi element in the BNN5 was replaced by Na/K through topochemical reaction, and KNN plate-like products which have anisotropic crystal structure were fabricated. It should be emphasized that piezoresponse force microscopy (PFM) was used to confirm three-dimensional (3-D) morphology, while piezoelectric properties of single crystalline KNN platelets were acquired simultaneously. The as-synthesized KNN structures are expected to play an important role in the study of textured KNN ceramics. Meanwhile, the methodology investigated in this paper can also be applied for further fundamental studies on KNN system as well as other lead-free piezoelectric materials.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2013
·
IF 3.328
Xinzhou Wu,Zheng Chen,Zheng Cui
Albumen and BaTiO 3 nanoparticles are employed to make solution processable nanocomposite for high permittivity films. The nanoparticles are modified with poly(acrylic acid) molecules to achieve homogeneous dispersion in albumen aqueous solution and made into films by drop casting. The dielectric constant and loss tangent of albumen–BaTiO 3 nanocomposites are investigated as the function of volume fraction of BaTiO 3 . The nanocomposites exhibit maximum relative permittivity of 52 and good dielectric stability over a wide range of frequency, while the loss tangent is below 0.05 even at high BaTiO 3 loading of 80 vol%. The dielectric constants of nanocomposites with lower volume fractions (<41 vol%) are in good agreement with the Lichtenecker-Logarithmic model.
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NAUNYN-SCHMIEDEBERGS ARCHIVES OF PHARMACOLOGY
·
2014
·Vol. 387
·期 11
·1079-1089
·
IF 2.36
Zhao Xin,Zhang Kai-ping,Huang Ting,Yan Cai-Chuan,Liu Li-Rong,Zhu Qi-Lei,Guo Feng-Feng,Liu Chen,Li Bao-Xin
Arsenic trioxide (As 2 O 3 ) is used to treat acute promyelocytic leukemia. However, the cardiotoxicity of long QT syndrome restricts its clinical application. Previous studies showed that As 2 O 3 can damage the human ether-a-go-go-related gene (hERG) current via disturbing its trafficking to cellular membrane. This study aimed to investigate whether the As 2 O 3 -insulted hERG channel can be rescued by resveratrol, a recognized cardioprotective agent. The whole-cell patch clamp technique was used to record the hERG current and action potential duration. Co-immunoprecipitation and Western blot assay were applied to determine the function of hERG-Hsp70/Hsp90 chaperone complexes and the expression alteration of protein-folding-related proteins, respectively. Compared with treatment of As 2 O 3 alone, co-treatment with resveratrol successfully restored the current and surface expression of hERG and obviously shortened action potential duration in guinea pig ventricular myocytes. Further experiments demonstrate that resveratrol relieved As 2 O 3 -caused endoplasmic reticulum (ER) stress by restoring the function of hERG-Hsp70/Hsp90 chaperone complexes and downregulating the protein expression of ER chaperone proteins (calnexin and calreticulin) and activating transcription factor 6. In conclusion, resveratrol was able to rescue the trafficking deficiency and relieve the ER stress (ERS). Our findings suggest that resveratrol has a potential effect to alleviate the adverse effect of As 2 O 3 on cardiotoxicity.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Guanyao Wang,Xingyi Huang,Pingkai Jiang
High dielectric constant (k) polymer nanocomposites have shown great potential in dielectric and energy storage applications in the past few decades. The introduction of high-k nanomaterials into ferroelectric polymers has proven to be a promising strategy for the fabrication of high-k nanocomposites. One-dimensional large-aspect-ratio nanowires exhibit superiority in enhancing k values and energy density of polymer nanocomposites in comparison to their spherical counterparts. However, the impact of their intrinsic properties on the dielectric properties of polymer nanocomposites has been seldom investigated. Herein, four kinds of nanowires (Na2Ti3O7, TiO2, BaTiO3, and SrTiO3) with different inherent characteristics are elaborately selected to fabricate high-k ferroelectric polymer nanocomposites. Dopamine functionalization facilitates the excellent dispersion of these nanowires in the ferroelectric polymer matrix because of the strong polymer/nanowire interfacial adhesion. A thorough comparative study on the dielectric properties and energy storage capability of the nanowires-based nanocomposites has been presented. The results reveal that, among the four types of nanowires, BaTiO3 NWs show the best potential in improving the energy storage capability of the proposed nanocomposites, resulting from the most signficant increase of k while retaining the rather low dielectric loss and leakage current.
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PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Chunying Zhu,Xiaofen Ren,Youguang Ma
Densities (ρ) and viscosities (η) of aqueous xylitol solutions with glycine, l-alanine, l-valine, l-threonine, or l-arginine were measured at T = (293.15 to 323.15) K under atmospheric pressure. The density values were utilized to further calculate the apparent molar volume (Vφ), the limiting partial molar volumes of amino acids (Vφ0), the limiting partial molar volumes of transfer (ΔtrVφ0) and the interaction coefficients Vab, Vabb, Vabbb. The viscosity data were used to obtain viscosity B-coefficient, the free energies of activation per mole of solvent (Δμ10≠) and solute (Δμ20≠). The limiting partial molar volumes of transfer and the free energies of activation per mole of both solvent (Δμ10≠) and solute (Δμ20≠) were analyzed based on the cosphere overlap model and transition state theory, respectively. The hydration number of amino acid was determined using the obtained limiting partial molar volume and viscosity B-coefficient.
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Russian Journal of Physical Chemistry A
·
2017
·Vol. 91
·期 8
·1432-1438
·
IF 0.581
Wang Long,Zhang Fang,Gao Xiaoqiang,Luo Tingliang,Xu Li,Liu Guoji
The solubility of phthalic anhydride was measured at 283–313 K under atmospheric pressure in ethyl acetate, n -propyl acetate, methyl acetate, acetone, 1,4-dioxane, n -hexane, n -butyl acetate, cyclohexane, and dichloromethane. The solubility of phthalic anhydride in all solvents increased with the increasing temperature. The Van’t Hoff equation, modified Apelblat equation, λ h equation, and Wilson model were used to correlate the experimental solubility data. The standard dissolution enthalpy, the standard entropy, and the standard Gibbs energy were evaluated based on the Van’t Hoff analysis. The experimental data and model parameters would be useful for optimizing of the separation processes involving phthalic anhydride.
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危险品化学品经营许可证（带存储）