FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Xuehong Zhao,Shu’ni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
This article deals with the mean activity coefficients of LiCl in amide–water mixtures with both ɛ -increasing co-solvent (urea–water, N -methylformamide–water), and ɛ -decreasing co-solvent ( N , N -dimethylformamide–water, N , N -dimethylacetamide–water) systems at 298.15 K by potentiometric method. Meanwhile, thermodynamic properties including the osmotic coefficients, the excess Gibbs free energy, the standard solubility product, the primary LiCl hydration number and the standard free energy of transference from water to the mixtures were also calculated. The nonideal behavior of these systems has been discussed in terms of the Pitzer, the Modified Pitzer and the extended Debye–Hückel equations parameters.
研究领域:
物理化学
·
溶液化学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2022
·Vol. 121
·期 20
·
IF 3.971
Guan Xiaoli,Li Hongjiang,Yu Zhiyuan,Yu Xiaohan,Jin Shuaizhao,Gu Xin,Liu Xiang
A series of La 0.7 K 0.3− x Sr x MnO 3 (0.00 ≤ x ≤ 0.3) films were fabricated on LaAlO 3 substrates using a sol-gel spin-coating technique. The relationship between electrical transport properties and a microstructure was explained via the Jahn–Teller effect, a phenomenological percolation model, and a double-exchange mechanism. The results revealed the strong impact of K and Sr co-occupying A-sites on the formation of Mn 3+ /Mn 4+ pairs, crystal structure, conductivity, surface morphology, and in-plane and out-of-plane strains. The as-fabricated La 0.7 K 0.25 Sr 0.05 MnO 3 films showed a peak temperature coefficient of resistivity of 16.63% K −1 at 298.3 K.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2017
·Vol. 46
·期 9
·1767-1777
·
IF 1.342
Guo Lijiang,Wang Yaxiao,Tu Lanying,Li Jianqiang
Water activities for the MgCl 2 –RbCl–H 2 O ternary system and its sub-binary MgCl 2 –H 2 O and RbCl–H 2 O systems at 298.15 K have been measured using the isopiestic method. The measured results for the binary systems agree well with literature data. The measured equal water activity lines for the MgCl 2 –RbCl–H 2 O ternary system deviate from Zdanovskii’s rule. The solubilities for the MgCl 2 –RbCl–H 2 O ternary system also have been measured using a isothermal visual first/last crystal method, and the results are consistent with one reported set of solubility data. Pitzer’s model was selected to correlate the measured water activity and solubility data and the parameters reported in the literature are re-examined by comparing the model-calculated equal water activity lines and solubilities with experimental values measured in this work. New and reasonable parameters are obtained by fitting the water activity and solubility data measured in this work and those reported in the literature. The water activities and solubilities were simulated with the new parameters and the results show that the Pitzer model can successfully represent the thermodynamic properties and be used to calculate the solubility isotherms.
研究领域:
化学热力学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2013
·Vol. 42
·期 9
·1782-1793
·
IF 1.128
Lu Jia,Li Shu’ni,Zhai Quanguo,Jiang Yucheng,Hu Mancheng
The mean activity coefficients for CsCl in N -methylformamide or urea ( w ) + H 2 O (1 − w ) systems were determined in this work by potentiometry, using ion-selective electrodes at 298.15 K. The value of mass fraction w was varied between 0.00 and 0.40 in five unit-steps and the molality of CsCl was between 0.0020 and 1.4009 mol·kg −1 . The experimental data have been correlated with the Pitzer, modified Pitzer and the extended Debye–Hückel equations. The resulting values of the mean activity coefficients, the osmotic coefficients and the standard Gibbs energy of transfer, together with the Pitzer ion-interaction parameters ( β
(0) , β
(1) and C
φ ), extended Debye–Hückel parameters ( a , c and d ), and modified Pitzer parameters ( b , B
MX , C
MX ) are reported for the investigated systems.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 30
·9203-9210
·
IF 6.641
Y. Y. Zhou,E. H. Song,M. G. Brik,Y. J. Wang,T. Hu,Z. G. Xia,Q. Y. Zhang
Mn4+-doped fluoride red-emitting phosphors have been developed for backlighting white light-emitting diodes (WLEDs). However, the long fluorescence lifetime (τ > 5 ms) leads to the image-retention phenomenon for the human eye when Mn4+ is doped into equivalent X sites in A2XF6 (A = Na, K, Rb, Cs; X = Si, Ge, Ti, Zr). Herein, we report on novel red-emitting A2NaScF6:Mn4+ (A = K, Rb, Cs) (ANSF) phosphors with short fluorescence lifetimes (τ < 4 ms) and characteristic zero phonon line (ZPL) emission, which can be realized via non-equivalent doping of Mn4+ into Sc3+ sites. Density functional theory (DFT) calculations verified the formation of a slightly distorted environment of Mn4+ and an Na+ vacancy to balance the charge with Mn4+ non-equivalent doping. The WLED backlight using ANSF as a red-light component can reach a wide color gamut above 105% of the National Television Standards Committee (NTSC) standard, and the image-retention on the backlighted screen can be effectively avoided compared to the backlight obtained using commercial K2SiF6:Mn4+. Such a Mn4+ non-equivalent doping strategy opens a new perspective for the modification of local symmetry and enhancement of the luminescence properties of Mn4+-doped red-emitting fluoride phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yuli Shi,Haojian Zhang,Xiaodong Wang
N,N-Dimethylformamide (DMF) as the main solvent with strong dissolving power was blended with four secondary solvents (ethanol, n-propanol, isopropanol, and propylene glycol) with relatively weak dissolving power to form many new solvents. The dispersion index (inosine (form β) mole fraction) in five organic solvents such as DMF and in the newly formed solvent was also obtained one by one with the static method commonly used in solid–liquid equilibrium. The temperature environment includes the high temperature set at 323.15 K, the low temperature set at 278.15 K, and an interval between each temperature of 5 K. The pressure environment was the atmospheric pressure in the natural state, and the usual value was 101.0 kPa. In a mixed system, temperature was a non-negligible influencing factor from beginning to end, and its increase often led the solute to the trend of high solubility. In addition, the proportion of the main solvent also dominated the solubilization trend of the inosine (form β); the larger the proportion of DMF, the easier the dissolution process. When both of the above factors were fixed at a certain point, the dispersing ability of the dispersing liquid composed of DMF and ethanol was undoubtedly the first. Three models (Jouyban–Acree model, van’t Hoff–Jouyban–Acree model, and modified Apelblat–Jouyban–Acree model) were used to correlate the solubility data. The largest relative average deviation and root-mean-square deviation values were 4.66 × 10–2 and 7.27 × 10–4, respectively. The dispersion data of inosine (form β) obtained through this experimental process and related thermodynamic parameters obtained through thermodynamic calculations have important application significance for its industrial production and further purification.
研究领域:
药学
·
化学工程
·
生物化学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Rongrong Li,Guobo Huang,Huanan Hu,Chenghong Li,Wenping Jia
In this work, solid–liquid equilibria (SLE) data for ternary sodium 1-naphthalenesulfonate + sodium 2-naphthalenesulfonate + water system was measured at (283.15, 303.15 and 323.15) K respectively. The diagrams for solid liquid phase of the ternary system were well-established by the measured solubility data. The solid phases formed in the studied system were determined by the method of Schreinemaker’s wet residue. Moreover, the density of equilibrium liquid phase was gained in the process. At each temperature, there are two pure solids forming. They are sodium 1-naphthalenesulfonate and sodium 2-naphthalenesulfonate in the ternary system. The solubility data for the ternary system were calculated and regressed by NRTL model, giving acceptable results for the investigated systems.
研究领域:
化学热力学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Ningning Tian,Changyou Yu,Shichao Du,Bo Lin,Ye Gao,Zhenguo Gao
The solid–liquid equilibrium solubility of isatoic anhydride in 12 pure solvents (methanol, ethanol, 1-propanol, isopropyl alcohol, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, acetone, 2-butanone, acetonitrile, and 1,4-dioxane) at T = 288.15 to 328.15 K was measured by the gravimetric method under atmospheric pressure. Experimental results demonstrate that the mole fraction solubility of isatoic anhydride in these selected solvents increased with the increase of temperature, and the dissolution behavior is affected by multiple factors like polarity, H-bond interaction, cohesive energy density, etc. The modified Apelblat model, the van’t Hoff model, the nonrandom two-liquid model, and the λh model were used to correlate the experimental solubility data. The maximum values of the relative average deviation and root-mean-square deviation were no more than 4.23 × 10–2 and 5.31 × 10–4, respectively. Furthermore, the thermodynamic properties including the mixing Gibbs energy, mixing enthalpy, and mixing entropy were calculated, which indicates that the dissolution of isatoic anhydride was a spontaneous and entropy-favorable process.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 44
·25268-25273
·
IF 10.733
Jun Han,Kunjie Zhu,Pei Liu,Yuchang Si,Yujun Chai,Lifang Jiao
Herein, the preparation of CoSb nanoparticles embedded in carbon nanofibers with a raised surface (N-doped CoSb@C nanofibers) via the electrospinning method is reported for the first time. The distinct structure facilitates the pseudocapacitive behaviors, which is the key to obtain fast kinetics and long cyclability. N and Co elements can not only optimize the electronic configuration but also buffer the volume changes of the material during cycling. For potassium-ion batteries, the capacity maintains 250 mA h g−1 after 500 cycles at 1 A g−1, and for sodium-ion batteries, the capacity keeps 413 mA h g−1 after 1000 cycles at 1 A g−1. Thus, this work makes a great contribution towards exploring high-capacity anodes for practical potassium-ion batteries and sodium-ion batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF CARDIOVASCULAR PHARMACOLOGY
·
2022
·Vol. 80
·期 5
·679-689
·
IF 3.271
Wang Na,Yang Yang,Wen Jing,Fan Xin-Rong,Li Jian,Xiong Bing,Zhang Jin,Zeng Bo,Shen Jian-Wu,Chen Gui-Lan
Tolterodine is a first-line antimuscarinic drug used to treat overactive bladder. Adverse cardiac effects including tachycardia and palpitations have been observed, presumably because of its inhibition of the Human Ether-à-go-go-Related gene (hERG) K+ channel.
However, the molecular mechanism of hERG channel inhibition by tolterodine is largely unclear. In this study, we performed molecular docking to identify potential binding sites of tolterodine in hERG channel, and two-microelectrode voltage-clamp to record the currents of hERG and its mutants
expressed in Xenopus oocytes. The results of computational modeling demonstrated that phenylalanine at position 656 (F656) and tyrosine at position 652 (Y652) on the S6 helix of hERG channel are the most favorable binding residues of tolterodine, which was validated by electrophysiological
recordings on Y652A and F656A hERG mutants. The Y652A and F656A mutations decreased inhibitory potency of tolterodine 345-fold and 126-fold, respectively. The Y652A mutation significantly altered the voltage dependence of channel inhibition by tolterodine. For both the wild-type and the mutant
channels, tolterodine reduced the currents in a time-dependent manner, and the blockade occurred with the channel activated. Tolterodine did not interfere with hERG channel deactivation, whereas channel inactivation greatly impaired its blocking effect. The inhibition of hERG channel by tolterodine
is independent of its action on muscarinic acetylcholine receptors. In conclusion, tolterodine is an open-state blocker of hERG K+ channel with nanomolar potency. Y652 and F656, 2 aromatic residues on the inner S6 helix, are responsible for the high-affinity binding of tolterodine
to hERG channel.
研究领域:
药理学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2025
·Vol. 55
·期 3
·366-381
·
IF 1.3
Zhou Jinpeng,Du Yanping,Xie Peijing,Liu Bin,Xue Ning,Hou Haiyun,Wang Ning,Zheng Lina
The thermodynamic properties of electrolyte solutions elucidate the mechanisms of ionic interactions in solution. This study investigates the thermodynamic properties of the ternary systems containing cesium bromide (CsBr), water, and either 1,2-butanediol (1,2-BDO) or 1,4-butanediol (1,4-BDO) at 298.2 K utilizing potentiometric techniques. CsBr molalities were in the approximate range of 0.01 to 1 mol·kg −1 , and the mass fraction of 1,2-BDO/1,4-BDO in 1,2-BDO/1,4-BDO+H 2 O binary mixed solvents were 0, 0.10, 0.20, and 0.30. The Debye-Hückel model, the Pitzer model, along with the Nernst equation were explored to determine the thermodynamic parameters, which included the mean ionic activity coefficients ( γ ± ), osmotic coefficients ( φ ), excess Gibbs free energy ( G E ), standard Gibbs free energy of transference (Δ G
0 t
), and primary hydration number ( n hydr ). The results reveal that the γ ± of CsBr decreases with increasing the molality of CsBr and with increasing the mass fraction of 1,2-BDO and 1,4-BDO in the binary mixture. A positive value for the Δ G
0 t
signifies that the transfer of CsBr from pure water to the mixed solvent system is thermodynamically unfavorable and thus non-spontaneous. These findings can provide thermodynamic data to support potential industrial processes.
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·
IF 2.4
Hengli Ning,Hanyu Zheng,Yuqi Wang,Sisi Zhang,Long Li,Tong Pan,Yafei Guo,Tianlong Deng
Salt lakes are rich in boron, magnesium, potassium, lithium, and other elements of considerable industrial significance. Boron serves as a crucial tracer for investigating geological processes due to its high incompatibility and solubility. However, boron tends to form complex borates with other elements in salt lakes such as magnesium borates. The excessive accumulation of boron in brine, coupled with the phase transition of magnesium borate that releases boron, complicates the study of the boron cycle and contributes to environmental pollution. Therefore, investigating the phase transitions of borates and identifying stable solid phases at various temperatures are crucial for enhancing our understanding of the boron cycle and mitigating pollution in salt lakes. This paper investigated Mg2B6O11–H2O (308.15, 323.15 K) and Mg2B6O11–MgSO4 (5, 10, 20 and 30%)–H2O (308.15 K) systems via isothermal dissolution equilibrium, thermogravimetry, and X-ray diffraction. At 308.15 K, Mg2B6O11–H2O began converting to pinnoite at 237 h, reaching equilibrium at 1000 h; at 323.15 K, conversion started at 33.5 h and finished within 170 h. In MgSO4 solutions (5–30%), inderite remained stable for 68–94 days without transformation.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）