TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2021
·
IF 2.917
Ai-min LIU,Meng-xia GUO,Zhong-ning SHI,Yu-bao LIU,Feng-guo LIU,Xian-wei HU,You-jian YANG,Wen-ju TAO,Zhao-wen WANG
Zinc chloride (ZnCl 2 ) was dissolved in the 1,3-dimethyl-2-imidazolinone (DMI) solvent, and the metallic zinc coatings were obtained by electrodeposition in room-temperature ambient air. The conductivity ( σ ), viscosity ( η ), and density ( ρ ) of the DMI−ZnCl 2 solvated ionic liquid at various temperatures ( T ) were measured and fitted. Furthermore, cyclic voltammetry was used to study the electrochemical behavior of Zn(II) in the DMI−ZnCl 2 solvated ionic liquid, indicating that the reduction of Zn(II) on the tungsten electrode was a one-step two-electron transfer irreversible process. XRD and SEM−EDS analysis of the cathode product confirmed that the deposited coating was metallic zinc. Finally, the effects of deposition potential, temperature and duration on the morphology of zinc coatings were investigated. The results showed that a dense and uniform zinc coating was obtained by potentiostatic electro- deposition at −2 V (vs Pt) and 353 K for 1 h.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Zhendong Dai,Runchen Lai,Qingqing Zhang,Youqi Li,Zhaohua Li,Yu Huang,Facai Wei,Feng Shao
The introduction of additives is a widely recognized and easily implementable strategy to regulate interfacial polymerization for preparing polyamide (PA) membranes in desalination applications. There is growing interest in minimizing potential health and environmental risks associated with conventional additives. In this study, we employed an environmentally friendly polar aprotic solvent, 1,3-dimethyl-2-imidazolidinone (DMI), as an aqueous-phase additive, to fabricate PA membranes with enhanced permeability and selectivity. Structural characterization and spectroscopic analysis consistently show that the resulting membranes are thin and dense, with ridge-and-valley features exhibiting a 37 % increase in surface roughness compared to the pristine membrane prepared without DMI. Solubility parameter calculations, physicochemical measurements, and molecular dynamics simulations reveal that DMI reduces the interfacial tension between the aqueous and organic phases, enlarges the miscible region, and facilitates amine monomer diffusion. With the addition of 3 wt% DMI, the resulting membranes achieved a water permeability of 3.73 L m −2 h −1 ·bar −1 , which is over 50 % higher than that of the control membrane, while maintaining a NaCl rejection of 98.36 % and excellent long-term operational stability. This study demonstrates the potential of DMI as a sustainable additive to enhance both performance and environmental compatibility in the fabrication of reverse osmosis membranes.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Zhangyi Gao,Yue Tian,Ping Liu,Linjing Jiang,Lili Gao,Le Du,Jiqin Zhu
3,3-Dimethyl-2-butyl ketone (pinacolone) has received attention for its important role in organic synthesis. However, existing techniques to synthesize pinacolone come with low yields, which are detrimental to the subsequent purification and economic benefits of enterprises. In this study, a scale-up method based on mixing enhancement was developed to improve the synthesis of pinacolone from isoamylene without significant scaling-up effects. Reaction conditions such as temperature, reaction time, and molar ratios were systematically investigated in a microchannel reactor and a batch reactor. A maximum yield of 91% was obtained under batch conditions. On the basis of the proposed scale-up method, an 87% yield was achieved after a 50-fold volume scale-up. A simplified kinetic model (0.56 order with respect to 2-chloro-2-methylbutane) was also established.
研究领域:
有机化学
·
化工工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Guoli Zhang,Taotao Guan,Juncheng Wu,Jianlong Wang,Ning Wang,Kaixi Li
Oxidation stabilization is an extremely important step for maintaining microstructure as well as boosting performance of pitch-based carbon fibers, carbon/carbon composites, etc . However, the low reactivity of pitch molecules with oxygen and the sluggish diffusion kinetics of oxygen seriously hinder the oxidation process, leading to tremendous consumption on energy and time thereby. To overcome the problem, a novel free-radical-induced oxidation strategy is proposed through the modification of raw pitch with 2,3-Dimethyl-2,3-diphenylbutane (DMDPB). The strategy allows oxidation stabilization of pitch not relying solely on oxygen diffusion and self-reactivity of pitch molecules, but also on the substantial free radicals generated from thermolabile covalent bonds of DMDPB. Particularly, the free radical concentration of the modified pitch with 10 wt.% DMDPB reaches almost 2.2 times than that of raw pitch. Consequently, the crosslinking reactions between pitch molecules are homogeneously promoted and their average molecular weight, softening point, and carbon yields are also elevated significantly. The induced reaction mechanism of DMDPB and its synergistic reaction mechanism with oxygen have also been investigated explicitly. The rapid homogeneous stabilization approach has been applied in the preparation of carbon fiber (with a diameter of ~ 18 μm) and spherical activated carbon (with a diameter of ~ 600 μm), offering an attractive perspective on low-cost preparation of pitch-based carbon materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2025
·Vol. 98
·期 13
·3009-3016
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IF 0.8
Zhe Wang,Li Junzhi,Zhao Wei,Li Xiao Liang
The isobaric vapor-liquid equilibrium data for the four systems consisting of 1-octene + 2-methyl-thiophene, cyclohexene + 2-methylthiophene, 2,3-dimethyl-1-butene + 2-methylthiophene, and 2,3-dimethyl-2-butene + 2-methylthiophene were determined by using a modified Rose-Williams equilibrium still at 90.00 kPa. All the vapor-liquid equilibrium data measurements passed the thermodynamic consistent test by employing the Herington method. The azeotropic behavior was observed in the 1-octene + 2-methyl-thiophene system. Additionally, the experimental data were correlated by the Wilson model, and they were also compared with the original UNIFAC and UNIFAC Dortmund predictive models. All the results indicated that the measured data were in good agreement with the calculated values obtained from the Wilson. Meanwhile, the UNIFAC Dortmund model can provide better prediction result than the original UNIFAC model.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
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IF 26.8
Yifan Li,Xinmin Zhao,Ni Meng,Shuo Dong,Shan Yan,Man Yang,Changjiu Sun,Zhiqiang Li,Shaopeng Yang,Mingjian Yuan,Tingwei He
Mixed-halogen wide-bandgap (WBG) perovskite materials are employed in tandem solar cells (TSCs) due to their continuous tunability of bandgap. However, inhomogeneous halogen phases are often observed in bromine-rich perovskite films, which restricts the performance of WBG perovskite solar cells (PSCs) and TSCs. Here, homogeneous halogen-phase perovskite is proposed to form film by a synchronous halogen-phase transformation strategy. 1,3-Dimethyl-2-imidazolidinone (DMI) is introduced into the perovskite precursor solution, due to its stronger binding energy with lead halide (PbX 2 ). The homogeneous DMI-PbX 2 adducted intermediate phase is stable in precursor solution and at spin-coating stage. And it then synchronously transforms into a homogeneous halide-phase perovskite film at the annealing stage. Benefited from efficient carrier extraction and suppressed carrier recombination, the resulting 1.76 eV-bandgap PSC achieves a record power conversion efficiency (PCE) of 21.42% (certified 21.18%) among devices with a bandgap wider than 1.74 eV. Based on the high transmittance of semitransparent-WBG PSC, a 4-terminal all-perovskite TSC achieves a PCE of 29.66%.
研究领域:
材料科学
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光伏技术
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纳米技术
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能量转换
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薄膜技术
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太阳能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Chenkai Jiang,Han Chen,Junliang Wang,Yao Shen,Jiexu Ye,Shihan Zhang,Lidong Wang,Jianmeng Chen
A biphasic solvent features high absorption capacity and low heat duty for CO2 capture. Phase separation behavior is essential to cut down energy penalty. Four phase splitting agents with different hydrophobicities, such as 1,3-dimethyl-2-imidazolidinone (DMI), 1-methyl-2-pyrrolidinone (NMP), N,N-dimethylformamide, and sulfolane, were dosed to biphasic solvents, triethylenetetramine and 2-(diethylamino)ethanol. Experimental results revealed that they can tune the phase separation behavior during CO2 absorption. Generally, under the same CO2 loading, the volume ratio of the rich phase increased with their hydrophobicity (log P), which accounts for over 50%. Moreover, their influences on absorption capacity, kinetics, and thermodynamics were also investigated. After dosing NMP, the heat duty was decreased by 22%. Furthermore, a phase splitting agent with a positive log P was more conducive to reducing the heat duty, and one with a negative log P enhanced the absorption rate. With DMI, the absorption rate was 114% higher than that of MEA at rich loading. The 13C NMR analysis showed that the agents were not involved in CO2 absorption and did not affect the reaction mechanism. Furthermore, quantum calculation was used to verify the reaction mechanism, confirming that the phase splitting agent increases the reaction equilibrium constant and makes it proceed more thoroughly.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）