INTERNATIONAL JOURNAL OF THERMOPHYSICS
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2018
·Vol. 39
·期 5
·1-11
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IF 0.829
Fan Desong,Sun Si,Guo Li
A novel thermal control coating was presented based on the thermochromism of manganite. The pigment of K-doped manganite nanoparticles was dispersed into polymer matrix to prepare the coating with curing below 200 \(^{\circ }\) C. The nanoparticles size mainly distributes around 100–200 nm, and it shows a comparable stoichiometric ratio. The phase transition of the nanoparticles was observed from ferromagnetic metallic to paramagnetic insulator state. With increasing K doping level, the phase transition temperature increases, achieving controllable adjustment. Coating surface with and without pore defect was obtained by different polymer matrix. A sharp emittance variation was observed with increasing temperature in K-doped coating. The variation magnitude of emittance is up to 0.46, which is attractive to space thermal control. It is suggested that the pigment content of 50 wt% is sufficient to realize a large emittance variation.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Lingzong Meng,Xia Wang,Dan Li,Tianlong Deng,Yafei Guo,Lan Yang
The solubilities in the quaternary system NaCl–KCl–SrCl2–H2O and its subsystem KCl–SrCl2–H2O at 288.15 K were investigated with the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for KCl and SrCl2·6H2O, two solubility univariant curves, and one cosaturated point. The dry-salt diagram of the quaternary system consists of three single-salt crystallization fields for NaCl, KCl, and SrCl2·6H2O, three solubility univariant curves, and one invariant point. By combination of the determined solubilities and Pitzer binary parameters obtained in the literature, the lacking Pitzer mixing parameters θNa,Sr, θK,Sr, ΨNa,Sr,Cl, and ΨK,Sr,Cl and the solubility product constants of the solid salts for the systems were fitted on the basis of the Pitzer model. The model was then used to calculate the solubilties of the two systems. The theoretical results calculated using the model coincide with the experimental values.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Xinyi Wang,Dejiang Zhang,Shiyuan Liu,Yifu Chen,Lina Jia,Songgu Wu
The solubility of imatinib mesylate in nine monosolvents and two binary solvents was determined by the shaken flask method followed by UV composition analysis from 278.15 to 318.15 K at atmospheric pressure. The solubility increases with the increasing of temperature in all solvents we chose. Meanwhile, the dissolving capacity of imatinib mesylate ranks as methyl acetate < 2-propanol < acetonitrile < isobutanol < 1-butanol < tetrahydrofuran < 1-propanol < ethanol < methanol. The Apelblat model, λh equation, and nonrandom two-liquid (NRTL) model described the solubility data of imatinib mesylate in monosolvents; simultaneously, the Apelblat model, combined nearly ideal binary solvent/Redlich-Kister model, and NRTL model were employed in binary solvents. The results show a satisfactory correlation with the experimental data. Additionally, mixing thermodynamic properties of imatinib mesylate were calculated based on the NRTL model, which reveals the mixing process is spontaneous and exothermic.
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ADVANCED POWDER TECHNOLOGY
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2014
·
IF 1.642
Renping Cao,Kangbin Chen,Qianglin Hu,Wensheng Li,Hui Ao,Chunyan Cao,Tao Liang
A series of Sr (1 − x − y − z ) MoO 4 : x Eu 3+ , y Bi 3+ , z R + (R + = Li + , Na + , and K + ) phosphors are prepared through solid-state reaction method in air. Eu 3+ doped SrMoO 4 phosphor can show red emission at ∼616 nm under excitation 275 nm and 397 nm light due to the 5 D 0 → 7 F 2 transition of Eu 3+ ion, and its emission intensity can be enhanced after co-doping Bi 3+ owing to energy transfer between Bi 3+ and Eu 3+ ions. The mechanism of energy transfer is discussed by the schematic energy level diagrams of Bi 3+ and Eu 3+ ions. The optimal composition in Eu 3+ and Bi 3+ co-doped SrMoO 4 phosphors is determined to be (Sr 0.92 Eu 0.05 Bi 0.03 )MoO 4 . The emission intensity of SrMoO 4 :Eu 3+ , Bi 3+ phosphor is found to be further improved by using Li + , Na + , and K + ions as charge compensators. These experiment results in the paper are helpful to develop novel and high-efficiency phosphors for white light-emitting diodes.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2014
·
IF 2.045
Lingzong Meng,Dan Li,Tianlong Deng,Yafei Guo,Cunyun Ma,Youcai Zhu
The solubilities and refractive indices of the NaBr–CaBr2–H2O system at 288.15 K were determined using the isothermal equilibrium solution method. The phase diagram and refractive index diagram were drawn for this system at 288.15 K. The system belongs to the hydrate II type. The phase diagram is comprised of two invariant solubility points, three univariant solubility curves, and three areas of crystallization: NaBr·2H2O, NaBr and CaBr2·6H2O. Using the temperature-dependent formulas from the literature, the Pitzer parameters and the solubility product constants (ln Ksp) of NaBr·2H2O and NaBr were determined. Applying the Pitzer and Harvie–Weare (HW) model, the solubility product constant of CaBr2·6H2O was fit with the solubilities in this research work, and then, the mean activity coefficients of sodium bromide and calcium bromide and the solubilities for the ternary system at 288.15 K were demonstrated. Comparisons between the calculated and measured solubilities show that the predicted data have good accordance with the experimental results.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
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IF 2.679
Jiayi Chen,Lingxiao Chen,Yingjie Xu
Densities and viscosities of the pure ionic liquid 1,1,3,3-tetramethylguanidine imidazole ([TMG]IM) and its binary mixtures with methanol, ethanol, 1-propanol, and 1-butanol were measured at temperatures from T = (293.15 to 313.15) K. The thermal expansion coefficient, molecular volume, standard entropy, and lattice energy of [TMG]IM were obtained from the experimental density value. The temperature dependence of the viscosity of [TMG]IM was fitted to the fluidity equation. Excess molar volumes V E and viscosity deviations Δ η of the binary mixtures were calculated and fitted to the Redlich–Kister equation with satisfactory results. The result shows that the V E values of the binary mixtures are negative over the whole composition range, while Δ η values have an S-shape deviation. Temperature has little effect on the V E of the systems, but it has significant effect on the Δ η . Furthermore, the absolute values of V E for {[TMG]IM (1) + alcohol (2)} systems at the same temperature decrease with increasing carbon alkyl chain of the primary alcohol. Other derived properties, such as the apparent molar volumes, partial molar volumes, excess partial molar volumes, Gibbs free energy of activation for viscous flow, and excess Gibbs free energy of activation for viscous flow of the above-mentioned systems were also calculated.
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FLUID PHASE EQUILIBRIA
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2015
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IF 2.2
Yang Feng,Entao Yang,Leping Dang,Hongyuan Wei
Liquid–liquid phase equilibrium data for ternary systems containing formamide (or ethylene glycol (EG), monoethanolamine (MEA) + indole + 2-methylnaphthalene (2-MN) at 308.15 K under atmospheric pressure were measured in this work. The results show that all the three ternary systems are Treyball type 1 systems. The experimental data were correlated well using both the non-random two liquid (NRTL) model and universal quasi-chemical activity coefficient (UNIQUAC) model. In addition, both the distribution coefficient and selectivity coefficient of formamide, EG and MEA were calculated to investigate the feasibility of extracting indole from 2-MN and formamide presented a better selectivity.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Peipei Zhu,Yanxin Chen,Meijing Zhang,Ying Bao,Chuang Xie,Baohong Hou,Junbo Gong,Wei Chen
In this work, the solubility of 1,3-dimethylurea form I (DMUI) in seven solvents including water, 2-butanol, 2-propanol, acetone, acetonitrile, ethyl acetate and butyl acetate were measured by a synthetic method at a temperature range from (288.15 to 328.15) K at atmospheric pressure. For the temperature range investigated, the solubility of DMUI in the selected solvents increased with increasing temperature. Results of these measurements were well-correlated with the modified Apelblat equation, λh equation, van’t Hoff equation and Wilson model. Besides, the thermodynamic data ( i.e. , Gibbs energy, enthalpy, and entropy of mixing) were calculated by using the Wilson model. The chemical potential, solvation free energy and interaction enthalpy of DMU in solution were calculated by COSMO-RS model. This model was also applied to predict DMU solubility which showed good agreement with the experimental values.
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Asia-Pacific Journal of Chemical Engineering
·
2016
·Vol. 11
·期 2
·305-313
·
IF 0.728
Xing Li,Lei Bei,Zhi Sun,Kun Liu,Xu Zhang,Xiaozhao Han
The study aimed at investigating the addition effects of P, K, and micronutrient fertilizers on the permeability of N-nutrient fertilizer urea through a representative polymer membrane, which is of great importance in polymer-coated compound fertilizer. Specifically, the permeability of urea through polystyrene membrane was determined experimentally at the nominal temperature of 298 K using the Ussing chamber method for fertilizer solutions of urea–water, urea–NaH 2 PO 4 –water, urea–Ca(H 2 PO 4 ) 2 –water, urea–KCl–water, and urea–NaCl–water. The experimental data showed that the addition effects of NaH 2 PO 4 , KCl, and NaCl on urea permeability were pronounced and could be promotion or suppression depending on the amounts added. The variation of urea permeability with additive concentration could be explained by the ‘solution–diffusion’ model, suggesting that the specific intermolecular and interionic interactions in the permeation solution were an important factor determining the permeability. Using the saturated urea–water solution as basis, the addition of saturated KCl increased the urea permeability by 2.5 times, while the addition of saturated Ca(H 2 PO 4 ) 2 and NaH 2 PO 4 decreased the permeability by 41% and 76%, respectively. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.
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FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Yemin Yu,Tao Li,Yonghong Hu,Wenge Yang,Yuhao zhang,Renlun Deng,Min Jiang
Research on relevant solid–liquid equilibrium of drug Norfloxacin (NFLX) in different solvents is necessary for an elementary study of industrial implantation. In this work, the solid–liquid equilibrium of NFLX in ethanol, 1-butanol, isopropanol, acetone, acetonitrile , ethyl acetate , N-hexane, N,N-dimethylformamide single pure solvent and in (N,N-dimethylformamide + ethyl acetate) binary solvent mixtures were probed under atmosphere pressure at desired temperatures from 278.15 K to 328.15 K. The Gibbs energy , enthalpy, and entropy of solution were obtained from these solubility data. The modified Apelblat model, the Buchowski–Ksiazaczak λh model, Redich-Kister (CNIBS/R-K) model, Jouyban-Acree model, ideal model and the Van't Hoff analysis were applied to depict and forecast the diversification tendency of solubility. The satisfactory simulation results were obtained. Moreover, the thermodynamic functions for NFLX dissolution from calculation, using the van't Hoff and Gibbs equations, imply that in each studied solvent and in binary solvent mixtures, the process of NFLX dissolution is endothermic. Based on the above analysis, N,N-dimethylformamide is checked as the best solvent and ethyl acetate can be used as an effective anti-solvent in the crystallization process of NFLX.
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ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Lu Li,Yuanyuan Fan,Qingling Li,Renjie Sheng,Haibin Si,Juan Fang,Lili Tong,Bo Tang
Various intracellular metal ions have closely related functional roles in the nervous system. An excess or deficiency of essential metal ions can contribute to neurodegenerative diseases. Thus, the detection of various metal ions in neurons is important for diagnosing and monitoring these diseases. In particular, single-cell analysis of multiple metal ions allows us to not only understand the cellular heterogeneity and differentiation but also determine the actual relationships among multiple metal ions in each individual cell. Aiming at the low efficient single-cell manipulation and interference of complex biological matrices within cells in the existing method for single-cell metal ion detection, in this manuscript, we present a convenient, sensitive, and reliable method to simultaneously identify and quantify multiple metal ions at the single-cell level using a microfluidic system. Using the combination of on-chip electrophoresis separation and multicolor fluorescence detection, we achieved the simultaneous analysis of Na+, K+, Ca2+, and Mg2+ in single PC-12 cells and studied changes in these four metal ions in Aβ25–35-treated PC-12 cells, which is a model of Alzheimer’s disease (AD). The data showed that metal ions imbalances in neuron-like cells may be associated with AD induced by Aβ25–35. This method paves the way for multiple metal ion detection in single neuron-like cells, and the results provide insights regarding synergistic function of multiple metal ions in regulation of neurological diseases at the single-cell level.
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PubMed
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.
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