JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
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IF 2.679
Yujuan Chen,Kelei Zhuo,Jing Chen,Guangyue Bai
Apparent molar volumes V Φ ,DIL and viscosity B -coefficients of the dicationic ionic liquids (DILs) in {glucose (Glc) + water} solutions were determined from density and viscosity measurements at T = 298.15 K. Limiting apparent molar volumes V Φ ,DIL 0 of the DILs, volumetric interaction parameters, and activation energies Δ μ DIL 0 ≠ were also obtained, together with the contributions of the solvent property B 1 and the dicationic ionic liquid – solvent interaction B 2 to the B -coefficient. A linear relation was observed between V Φ ,DIL 0 and the number of methylene groups n (CH 2 ) in the alkyl linkage chain of DILs. Volumetric interaction parameters and B 2 values are positive and increase with increasing the length of alkyl linkage chain of the dication. The DIL – glucose interactions were discussed in terms of the size and solvation of the DILs and glucose.
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FLUID PHASE EQUILIBRIA
·
2013
·
IF 2.379
Yumei Kai,Yonghong Hu,Yan Liu,Mengmeng Liang,Wenge Yang,Yu Xi
The solubilities of mercaptosuccinic acid in binary solvent mixtures consisting of water + methanol; water + ethanol; and water + acetone were determined by a dynamic method over the temperature from 278.15 to 333.15 K. The solubility data were correlated with the modified Apelblat equation and the semi-empirical Buchowski–Ksiazczak λh equation. The Buchowski–Ksiazczak λh equation can regress the solubility data much better than Apelblat equation. The calculated values are in good agreement with the experimental values. This study provides valuable data for the mercaptosuccinic acid purification by the preferential crystallization procedure.
研究领域:
物理化学
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化学工程
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热力学
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分离过程
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溶液化学
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 21
·215202
·
IF 3.874
Guandong Wang,Daiming Liu,Shuangqing Fan,Zhaoyang Li,Jie Su
In this work, high-dielectric-constant (high-k) erbium oxide（Er2O3）film is fabricated using the spin coating method, and annealed at a series of temperatures (from 400 °C to 700 °C). The effect of annealing temperature on the microstructural and electrical properties of Er2O3 nanofilm is investigated. To demonstrate the applicability of the Er2O3 film, the indium oxide (In2O3) thin film transistor (TFT)-based amorphous Er2O3 dielectric film is fabricated at different temperatures. The TFT-based EO-600 shows a low-operating voltage and good electrical properties. The inverter demonstrates that the Er2O3 nanofilm synthesized by the sol-gel method could be a promising candidate as the dielectric layer in a low-voltage electronic device.
研究领域:
材料科学
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电子工程
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
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IF 2.4
Jia Xu,Xun Wang,Jiazheng Qin,Ziwei Hu,Ruyi Lin,Yong Ma,Dan Li,Lingzong Meng
The solid–liquid phase equilibria of the quaternary system Na+, Cs+//Cl–, CO32––H2O and its subsystem Na2CO3–Cs2CO3–H2O at 308.15 K were studied by the isothermal dissolution method. The phase diagram of the system Na2CO3–Cs2CO3–H2O is composed of two single-salt crystallization fields of Na2CO3·H2O and Cs2CO3·H2O, two solubility univariant curves, and one invariant point. The dry-salt phase diagram of the quaternary system consists of three invariant points, seven univariant curves, and five crystallization regions corresponding to Na2CO3·H2O, NaCl, solid solution [Cs1–x(Na·H2O)x]Cl, Cs2CO3·H2O, and double salt CsCl·2NaCl·2H2O. The areas of crystallization zones decrease according to the above order. The Jan̈ecke index of H2O, pH, and refractive index of the liquid phase in the quaternary system change regularly with the Jan̈ecke index of Cs+. These results on the phase diagram of the quaternary system can supply theoretical references for cesium salt separation from carbonate-type brine.
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APPLIED CATALYSIS A-GENERAL
·
2026
·
IF 4.8
Jue Wang,Huitao Liu,Siyu Zeng,Jinyi Yang,Zaihui Fu,Youji Li,Senpei Tang,Anqun Su
Merely 1.2 wt% KCCN elevates cyclohexane conversion to 64.47%, 2.5-fold that of pure QA-DT. • QA-DT performs HAT cleavage, while KCCN activate O 2 , enabling an efficient catalytic cycle. • The system achieves high ketone/alcohol selectivity (K/A ratio ∼5) and total selectivity > 95%. • The nanosheet-cluster interface boosts visible light absorption and stabilizes the catalyst. The selective oxidation of cyclohexane to KA oil holds significant importance in both fundamental research and industrial applications, with the formation of cyclohexyl hydroperoxide serving as a crucial rate-determining step. In this study, a hybrid material designated as QA-DT@KCCN was constructed through the in-situ composition of potassium/cyano-comodified carbon nitride nanosheets (KCCN) and quaternary ammonium-decatungstate (QA-DT), aiming to enhance the mass transfer efficiency of O 2 and improve the utilization efficiency of hydrogen atom transfer products. The results demonstrate that a minimal KCCN doping of 1.2 wt% significantly enhanced the photocatalytic oxidation performance. Under light irradiation in acetonitrile for 2 h, a cyclohexane conversion rate of 64.47% was achieved (compared to 25.18% with pure QA-DT), with a ketone/alcohol ratio of 5.02 and overall selectivity exceeding 95%. Radical quenching and trapping experiments confirmed that superoxide anion radicals (•O 2 - ) and holes (h + ) are the key active species in this photocatalytic system. The unique nanosheet-cluster interfacial coupling effect in the hybrid material not only facilitates directional electron transfer but also enhances visible light absorption and stabilizes the ionic structure of decatungstate. This study provides a novel strategy for designing high-efficiency decatungstate catalysts, offering valuable insights to advance the technology of selective inert hydrocarbon oxidation. Download: Download high-res image (208KB) Download: Download full-size image
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ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Riyang Shu,Haozhe Huang,Bin Hu,Long Xie,Xintong Chen,Zhipeng Tian,Chao Wang,Jingtao Zhang,Sheng Yang,Xianglong Luo,Ying Chen
Methanol steam reforming is a popular technology for hydrogen production, but it usually suffers from the methanation side reaction and low hydrogen yield. Herein, a novel K-doped Ru/CeO2 catalyst was proposed to suppress methanation and enhance hydrogen production. The Ru-5K/CeO2 catalyst doped with 5 wt % K achieves 100% methanol conversion, a 0.578 mol·g–1·h–1 hydrogen production rate, and 66.4% hydrogen selectivity at 450 °C, with only 3.6% CH4, which is much better than other Ru–K/CeO2 catalysts. Under the same conditions, Ru/CeO2 and Ru-10K/CeO2 only achieve 0.268 mol·g–1·h–1 and 0.224 mol·g–1·h–1 hydrogen production rates, 64.1% and 64.5% hydrogen selectivity, respectively. The promotion effect and mechanism of K doping on the methanation suppression of Ru/CeO2 catalysts in the methanol steam reforming process were investigated in detail. Characterization and experimental results show that suitable K doping in the Ru/CeO2 catalyst enhances the metal–carrier interactions and induces the formation of abundant oxygen vacancies at the same time. And the hydrogen atom dissociation and water–gas shift reactions on the catalyst surface are promoted significantly. Additionally, in situ DRIFTS characterization presents that the Ru-5K/CeO2 catalyst dominates the formation of the bridged carbonyl (Ru-CO-K) intermediate. This inhibits methane formation due to the interaction between Ru and K, and strengthens the connection of CO generated by methanol decomposition. The increase in K leads to the formation of abundant oxygen vacancies in CeO2, which promotes the dissociation of water to form hydroxyl groups and hydrogen and facilitates the water–gas shift reaction. The conversion of bridged carbonyl groups to CO2 and H2 is also accelerated, and methane formation through this dual regulatory mechanism is thus inhibited. This work offers fresh perspectives and a useful reference for hydrogen production, contributing to the ongoing discussion on the role of alkali metals in promoting methanol steam reforming.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Wenzhuo Chen,Jian Yang,Jiazheng Hao,Feiran Shen,Lunhua He,Xia Deng,Jiasheng Lv,Jing Fang,Laijun Liu,Jungu Xu
The undoped K2ZnV2O7 material has a melilite-like structure, with the K+ ions distributed orderly on two distinguishable crystallographic sites, which is the main difference with the case in a typical A2B3O7 melilite material where the A site cations occupy only one crystallographic position. Herein, we report that substitution of Ga for Zn in K2ZnV2O7 would induce the K+ ions’ order-to-disorder transition and transform the K2ZnV2O7 from the melilite-like structure to a typical melilite phase, coupled with significantly enhanced oxide ion conductivity, e.g. ∼1.01 × 10–1 S/cm at 600 °C for the K2Zn0.7Ga0.3V2O7.15 sample, which is about 2 orders of magnitude higher than the parent material. The powder neutron diffraction data analysis results revealed two sites for the interstitial oxygen defects that are introduced by the donor-doping. The introduction of interstitial oxygen into the K layer strongly correlated with the K ions’ order-to-disorder transition, while the interstitial oxygens within the 5-fold (Zn/Ga/V)O4 tetrahedral rings are responsible for the enhanced oxide ion conductivity. These findings provided a comprehensive understanding of the melilite-like and typical melilite materials for the mechanism of the stabilization and migration of interstitial oxygen defects.
研究领域:
材料科学
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固体化学
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电化学
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晶体学
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无机化学
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PubMed
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Shiqiang Zhong,Jingwei Liu,Yongcong Huang,Yulin Cao,Feng Wu,Xuhui Li,Dawei Luo,Zhouguang Lu,Hua Cheng
Spinel LiMn2O4 (LMO) is a promising fast-charging cathode material because its unique three-dimensional Li-ion diffusion channels offer favorable ionic diffusivity. However, LMO encounters rapid structural degradation at high current densities. To tackle this issue, we introduce K+ ions into the interstitial 16c sites to stabilize LMO, thereby achieving excellent fast-charging capability. The K-LMO retains 75% of its theoretical capacity at an ultrahigh current density of 1.48 A g–1 (10 C, corresponding to a charging time of 5 min). Comprehensive characterizations demonstrate that the incorporation of K+ into LMO expands the LiO4 space, strengthens the Mn–O bonds and suppresses the Jahn–Teller effect, leading to improved Li-ion mobility and enhanced stability of the diffusion channels. Additionally, the volume variation induced by cycling under a high charge state is efficiently suppressed through a solid-solution transition, thus preventing structural degradation against long-term cycling. Given this, this study presents an attractive candidate material for the cathode of fast-charging lithium-ion batteries.
研究领域:
材料科学
·
电化学
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Xiangyu Sun,Dongmei Zhang,Yixiao Yang,Xia Jiang,Yimin Zhu,Xiaoyun Sun,Guan Wang
The molar fraction solubility of Nifuratel in 12 monosolvents, including water, methanol, ethanol, isopropanol, acetonitrile, tetrahydrofuran, ethyl acetate, N,N-dimethylformamide, dimethyl sulfoxide, acetic acid, acetone, and dichloromethane, was measured using the gravimetric method from 293.15 to 333.15 K under 101.3 kPa. In all selected solvents, solubility increases with temperature throughout the experimental temperature range. Dimethyl sulfoxide exhibits the highest solubility, with a value 1000 times greater than that of water, which exhibits the lowest solubility. Five thermodynamic models (the modified Apelblat model, Yaws model, λh model, Wilson model, and NRTL model) were selected to correlate the solubility data. All models demonstrate excellent fitting performance, with the empirical models showing particularly superior results. The calculated Hansen Solubility Parameter results suggest that, in most solvents, dispersion forces play a dominant role in the mixing process, except for water, where hydrogen bonding is the primary factor. Additionally, the thermodynamic mixing properties were incorporated into the Wilson model. The calculated results suggest that the mixing process is spontaneous and predominantly entropy-driven.
研究领域:
药学
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物理化学
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Jingxuan Qiu,Rui Zhang,Chaoqun Zhang,Jing Lin,Cong Liu,Yunchun Guo,Huiliang Wang,Yingxin Xie,Ke Xiao
In this work, the solubility of phenprobamate in water, acetone, 2-butanone, methyl acetate, ethyl acetate, methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, and 1-pentanol was determined by a static gravimetric method at temperatures ranging from 283.15 to 323.15 K under atmospheric pressure. The solubility magnitudes increase monotonously with the increase of temperature in each solvent. The solubility is roughly ranked as propanone > methyl ethyl ketone > acetic acid methyl ester > ethyl acetate > water in non-alcohol solvents and methanol > 1-pentanol > sec-butanol > ethanol > n-butanol > n-propanol > isopropanol in alcohols. The solubility of phenprobamate could be ultimately determined by the combined influence of solvent polarity, hydrogen bond acceptor propensities, solvent–solvent intermolecular interactions, and spatial steric hindrance. In addition, the solubility data were correlated by the Apelblat model and the Yaws model. The outcomes show that the two models could both satisfactorily fit the experimental data, in which the Yaws model is more appropriate to correlate the solubility of phenprobamate compared with the Apelblat model. The data reported in this work contribute to the further crystallization and separation process of phenprobamate.
研究领域:
化学工程
·
药物化学
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ACS Catalysis
·
2026
·
IF 13.1
Wendong Wang,Xingwen Cha,Longmei Shang,Kang Sun,Fangsong Guo,Jianchun Jiang,Guowu Zhan
This work demonstrates a strategic shift from dynamic electrolyte modulation to static, intrinsic promotion of the CO2 reduction reaction by stably integrating alkali metal cations as a solid-state component within a heterogeneous catalyst. To address the persistent challenge of alkali metal ion leaching due to high aqueous solubility, we immobilize K+ cations into a carbon nitride framework (Ni@K–C3N4) hosting atomically dispersed Ni–N3 sites via an ionothermal strategy. Structural confinement through coordination with nitrogen sites in the C3N4 matrix effectively suppresses K+ leaching, enabling sustained electronic regulation of the Ni centers. Combined experimental and theoretical analyses reveal that K+ incorporation attenuates d-π conjugation, promotes electron localization around Ni sites, and stabilizes low-valent Niδ+ species. This electronic reconfiguration enhances CO2 adsorption and activation while suppressing competitive hydrogen evolution reaction. The optimized Ni@K–C3N4 catalyst achieves a CO Faradaic efficiency of 95% at −0.74 V vs RHE, a current density of ∼20 mA·cm–2, and stable operation over 50 h. Notably, it maintains >80% CO selectivity under a diluted CO2 atmosphere (40%), highlighting its practicality for real low-concentration streams. This work establishes a polymer-functionalization strategy for precise electronic tuning of single-atom catalysis, advancing the design of efficient CO2 utilization systems.
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Small
·
2021
·Vol. 17
·期 45
·2104557
·
IF 13.281
Guolong Wang,Yaling Wang,Boyuan Guan,Jiamei Liu,Yan Zhang,Xiaowei Shi,Cheng Tang,Guohong Li,Yingbo Li,Xiao Wang,Lei Li
MnO 2 -based material is one of the most promising cathode candidates of aqueous zinc-ion batteries (ZIBs), but its commercialization is hindered by the sluggish reaction kinetics and poor structural stability. Herein, a hierarchical framework consisting of core–shell structured carbon nanotubes@K-birnessite-MnO 2 enwrapped by graphene/carbon black bicomponent networks (CNT@KMO@GC) via a simple method for ZIBs is designed and developed. The hierarchical framework characterized with favorable K + preintercalation, δ-phase, and vertically aligned nanoflake arrays of KMO and 3D electrically conductive network shows the enhanced electronic/ionic conductivity and improved wettability with electrolyte, resulting in the fast charge/mass transport and stable structural stability of CNT@KMO@GC. When used as cathode in ZIBs, CNT@KMO@GC exhibits exciting electrochemical performance with remarkable capacity (405.5 mAh g −1 at 0.30 A g −1 ), high rate performance (166.6 mAh g −1 up to 10.0 A g −1 ), and impressive cycling stability (almost no capacity decay after 2000 cycles and 77.3% retention after 10 000 cycles at 10.0 A g −1 ). The energy storage mechanism of CNT@KMO@GC is clarified as H + /Zn 2+ coinsertion/extraction via electrochemical analysis and ex situ characterization. This study offers an innovative paradigm for the advance of ZIBs.
研究领域:
材料科学
·
电化学
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