JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Chao Guo,Yangtong Tan,Yu Qian,Siyu Yang
Experimental liquid–liquid equilibria (LLE) data for ternary (methyl propyl ketone + hydroquinone + water) and (methyl propyl ketone + resorcinol + water) systems were determined under atmospheric pressure at T = 298.15, 318.15, and 333.15 K. Distribution coefficients and separation factors were calculated to evaluate extraction effectiveness. Hand, Bachman, and Othmer–Tobias equations were utilized to confirm consistency of experimental LLE data. Thermodynamic NRTL and UNIQUAC models were used to correlate experimental LLE data, and corresponding binary interaction parameters were obtained. The estimated data from the two models agree well with experimental LLE data. The NRTL model gives a better agreement than the UNIQUAC model for ternary (methyl propyl ketone + hydroquinone or resorcinol + water) systems.
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高影响因子
ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Chuan Wang,Wu Tang,Zeyi Yao,Yongzhen Chen,Jingfang Pei,Cong Fan
Terephthalic acid (H 2 TP) is initially unveiled to be the first example of organic anodes exhibiting the universal Li-ion, Na-ion and K-ion storage capabilities. In Li-ion half cells, H 2 TP can deliver the average capacities of ∼235 mAh g −1 for 500 cycles; In Na-ion half cells, H 2 TP is reported to deliver the average capacities of ∼200 mAh g −1 for 50 cycles; and in K-ion half cells, H 2 TP can exhibit the average capacities of ∼240 mAh g −1 for 150 cycles. At the same time, the chemical structure and crystal structure of H 2 TP could be transformed into its related metal salts on the anode side due to the low reduction potential. This work indicates that organic electrode materials should own the universal metal-ion-storage (e.g., Li + , Na + , K + , etc.) capability for their large void room of organic solid/crystal state.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Yangtong Tan,Chao Guo,Yu Qian,Siyu Yang
Liquid–liquid equilibrium (LLE) data for the ternary system of (2-pentanone + catechol + water) and (mesityl oxide + catechol + water) was measured under atmospheric pressure at T = (298.2, 318.2 and 333.2) K. The distribution coefficients and separation factors were employed to assess the efficiency of extracting catechol from water. The nonrandom two liquid and universal quasichemical models were applied to correlate the LLE data, and the corresponding binary interaction parameters were obtained. The topological analysis of LLE correlation was used to confirm that the parameters satisfy the Gibbs stability criteria.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jiangping Jing,Zhuoyuan Chen,Chang Feng
Graphitic carbon nitride (g-C 3 N 4 ) usually shows amphoteric property in a neutral solution. In this work, a K&I co-doped g-C 3 N 4 is prepared by simply sintering the mixture of dicyandiamine, KI and I 2 . The K&I co-doping modulates the band structure of g-C 3 N 4 with pulling the Fermi level toward its conduction band minimum. The obtained K&I co-doped g-C 3 N 4 (K&I-C 3 N 4 ) generates positive photocurrents over the whole investigated potential range, exhibiting a typical n-type semiconductor characteristic. Therefore, the K&I co-doping transforms the g-C 3 N 4 from amphoteric to n-type semiconductor. Also, the prepared K&I-C 3 N 4 shows widened light absorption range and enhanced separation efficiency of the photogenerated charge carriers, which results in the dramatically enhanced photoelectrochemical performance.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Kelei Zhuo,Hao Ren,Yujing Wei,Yujuan Chen,Jingjing Ma
Activity coefficients of the 1-alkyl-3-methylimidazolium bromide [Cnmim]Br (n = 3 to 8) ionic liquids (ILs) in fructose + water mixed solvents at 298.15 K were determined by cell potential measurements. The molalities of [Cnmim]Br ranged from (0.005 to 0.1) mol·kg–1 and those of fructose from (0.2 to 0.8) mol·kg–1. Gibbs free energy interaction parameters were also obtained together with salt constants. The interactions between [Cnmim]Br and fructose are mainly controlled by electrostatic interactions. Gibbs free energy interaction parameters (gES) and salting constants (kS) are negative for the ILs (n = 3 to 6), indicating fructose are salted-in by the ILs in water, whereas fructose are salted-out by the ILs (n = 7 and 8).
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2015
·
IF 2.979
Hui Liu,Yong-Sheng Wang,Xian Tang,Hui-Xian Yang,Si-Han Chen,Hui Zhao,Shan-Du Liu,Yu-Feng Zhu,Xiao-Feng Wang,Yan-Qin Huang
A sensitive, lable-free and low cost fluorescence aptasensor was developed for detecting 8-hydroxy-2′-deoxyguanosine (8-OHdG) by using 8-OHdG aptamer (Apt) as a recognition probe and N-methyl mesoporphyrin IX (NMM) as a reporter. The method is based on the conformational switching of a K + -stabilized G-quadruplex to a 8-OHdG-stabilized one. NMM can selectively bind to K + -stabilized G-quadruplex instead of 8-OHdG-stabilized one. The addition of 8-OHdG in the solution of Apt - K + ions leads to a sharp change in fluorescence intensity, which showed a good linear response toward 8-OHdG concentration ranging from 3.96 nM to 211 nM with a detection limit of 1.19 nM. The relative standard deviation and the recovery were 1.23–3.26% ( n = 11) and 94.8–106.7%, respectively. The proposed aptasensor consists of only an aptamer probe and a specific dye NMM, avoiding the complex and expensive labeling procedure. Thus it is much cheaper and more applicable.
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PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2015
·
IF 2.133
Yunsheng Liu,Dajiang Mei,Jingli Xu,Yuandong Wu
New alkali metal zinc selenites, A 2 Zn 3 (SeO 3 ) 4 · X H 2 O (A=Li, Na, K; X =2 or 0) were prepared through hydrothermal reactions . Li 2 Zn 3 (SeO 3 ) 4 ·2H 2 O ( 1 ) crystallizes in the monoclinic space group P 2 1 / c with lattice parameters a =8.123(4), b =9.139(4), c =7.938(3) Å, β =112.838(9)°. Na 2 Zn 3 (SeO 3 ) 4 ·2H 2 O ( 2 ) crystallizes in the monoclinic space group C2/c with lattice parameters a =15.7940(18), b =6.5744(8), c =14.6787(17) Å, β =107.396(3)°. K 2 Zn 3 (SeO 3 ) 4 ( 3 ) crystallizes in the monoclinic space group C2/c with lattice parameters a =11.3584(12), b =8.6091(9), c =13.6816(14) Å, β =93.456(2)°. The anionic structures are composed of [Zn 3 O 12 ] 18− sheets, chains, and “isolated” units in compound 1, 2, 3, respectively, and trigonal pyramids SeO 3 2− . The compounds were characterized by the solid state UV–vis–NIR diffuse reflectance spectroscopy , infrared spectra and thermogravimetric analysis .
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ANALYTICAL CHEMISTRY
·
2015
·
IF 5.636
Lu Li,Ping Li,Juan Fang,Qingling Li,Haibin Xiao,Hui Zhou,Bo Tang
Considering the important functions of cellular Na+ and K+ together with their cooperative efforts on various biological processes, it is significant to simultaneously detect Na+ and K+ at a single-cell level. Here, we present a novel method to discriminate and quantify simultaneously Na+ and K+ in single cells using a new near-infrared fluorescent probe associated with microchip electrophoresis. The fluorescent probe selectively responds to both Na+ and K+. The microchip electrophoresis allows accurate single-cell manipulation and effective distinction of Na+ and K+. Based on the method, the concentration of Na+ and K+ in single normal and cancer cells was compared, and the variation of Na+ and K+ in single cancer cells during the early stage of apoptotic volume decrease was monitored, which would help us to better understand the critical roles of Na+ and K+ in malignant cells and apoptosis. This method has paved a new way for the research of the synergistic function of Na+ and K+ in the regulation of various biological processes at a single-cell level.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Renping Cao,Qingqiang Xiong,Wenjie Luo,Donglan Wu,Xiao Fen,Xiaoguang Yu
A series of SrAl [4−(4 x )/3] O 7 : x Mn 4+ (0≤ x ≤1.4 mol%) and Sr (1−0.06/2) Al [4−(4×0.008)/3] O 7 :0.008Mn 4+ ,0.06R + (R + =Li + , Na + , and K + ) phosphors are synthesized by a conventional solid-state reaction method in air. The PLE bands peaking at~325, 395, and 470 nm and the strongest PL band peaking at~660 nm are assigned to the 4 A 2 → 4 T 1 transition of Mn 4+ ion and O 2− –Mn 4+ change transfer band, 4 A 2 → 2 T 1 , 4 A 2 → 4 T 2 , and 2 E → 4 A 2 transitions, respectively. The optimum Mn 4+ doping concentration is about 0.8 mol%. Li + , Na + , and K + ions used as charge compensator can improve observably the PL intensity of SrAl 4 O 7 :Mn 4+ phosphor with excitation 325 nm. The fluorescence lifetimes of SrAl [4−(4×0.008)/3] O 7 :0.008Mn 4+ and Sr [1−0.06/2] Al [4−(4×0.008)/3] O 7 :0.008Mn 4+ ,0.06 R + (R + =Li + , Na + , and K + ) are 0.958, 0.97, 1.113 and 0.965 ms, respectively. The luminous mechanism is explained by schematic energy level diagram of Mn 4+ ion. These experiment results indicate that SrAl 4 O 7 :Mn 4+ ,R + (R + =Li + , Na + , and K + ) phosphors can be used as red emitting phosphor candidate for white LEDs based on a UV (~325 nm) and near UV (~395 nm) bands of LEDs chip.
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JOURNAL OF SOLUTION CHEMISTRY
·
2013
·Vol. 42
·期 10
·1879-1887
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IF 1.128
Guo Song,Yang Wenge,Hu Yonghong,Wang Kai,Luan Yuanyuan
The solubility of N -acetylglycine was measured in methanol, ethanol, propanol, isopropanol, n -butanol and ethyl formate in the temperature range between 278.15 and 319.15 K under atmospheric pressure by a gravimetric method. The solubility of N -acetylglycine in those selected solvents increases with increasing temperature. The solubility data were correlated with the van’t Hoff equation, the modified Apelblat equation and the λh equation to obtain the corresponding model parameters. The experimental results could be useful for optimizing the industrial process of purification of N -acetylglycine.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Shidong Tian,Shuhang Ren,Yucui Hou,Weize Wu,Wei Peng
Densities and viscosities of 1,1,3,3-tetramethylguanidium lactate ([TMG]L) (1) + H2O (2) with different compositions were determined at temperatures from (303.15 to 328.15) K. Densities of [TMG]L (1) + H2O (2) decrease with the increase of temperature. However, when the mole fraction of water is lower than 0.5, the water content does not have an obvious influence on the density of [TMG]L. When the mole fraction of water is greater than 0.5, the densities of [TMG]L (1) + H2O (2) decrease obviously with further increasing the mole fraction of water. Viscosity of [TMG]L decrease dramatically with the increase of temperature and the water content. Excess molar volumes (VE) and viscosity deviations (Δη) of the binary mixtures were calculated by the experimental data and fitted to the Redlich–Kister equation with four parameters. The result shows that the values of VE and Δη for the binary mixtures are negative over the whole composition range and temperatures from (303.15 to 328.15) K. The negative of the excess properties indicates a strong interaction between the ionic liquid and water. The partial molar volumes (V̅i), excess partial molar volumes (V̅iE), Gibbs energy of activation for viscous flow (ΔG*), and excess Gibbs energy of activation for viscous flow (ΔG*E) of the binary mixtures were also calculated based on the densities and viscosities data. Besides, the Jouyban–Acree model was used to correlate the densities and viscosities of the binary mixtures with respect to the mixture composition and temperature simultaneously.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Yunxue Gao,Shuni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
The (solid + liquid) phase equilibrium of the ternary system (NaCl + RbCl + H 2 O) at T = (288.15, 298.15 and 308.15) K was studied by the method of isothermal solution saturation. Moreover, the density and refractive index of the solution was also determined. The solid phase was studied by the Schreinemaker’s wet residue method and verified by X-ray diffraction. The results show that each of the phase diagrams contains one invariant point, two univariant curves, and three crystallization regions. The crystallization region of NaCl increased obviously with the temperature increasing, while the crystallization regions of RbCl and the mixed crystallization region of (NaCl + RbCl) decreased a little. Furthermore, there are break points at the invariant points for density and refractive index curves.
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