JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yi Li,Songwei Zhang,Qi Ding,Baofeng Qin,Litian Hu
Ionic liquids (ILs) are extensively used in many fields owing to their attractive characteristics. Good structure designability provides ILs an opportunity to integrate multiple functions into their structures, which could promote their industrial applications as versatile materials. In this study, three 4, 6-dimethyl-2-mercaptopyrimidine (DMMP) based phosphonium ILs were firstly synthesized. The corrosion inhibition behaviors of these ILs for mild steel in 0.5 M H 2 SO 4 aqueous solutions were investigated by electrochemical tests. Results indicated that all of the three ILs exhibited surprising inhibition efficiencies as high as 99%, even at an ultralow concentration of 0.1 mM. The ILs' adsorption behavior on surface obeys Langmuir isotherm, indicating that the ILs inhibit corrosion of mild steel by monolayer adsorption on the mild steel surface. Moreover, due to the superior adsorption capacity on steel surface, DMMP based ILs are expected have great application potentials as high-performance lubricating materials. As expected, DMMP based ILs showed excellent lubrication performances both at 30 °C and 100 °C as compared to PAO and 1-butyl-3-methylimidazolium tetrafluoroborate (LB104). Surface analyses indicated that tribofilms consist of ILs adsorption layer and tribochemical products, such as FeS, Fe 2 O 3 and organic compounds containing C O bonds, are responsible for the predominant lubrication performances. Therefore, versatile ILs designed in this paper have gathered two significant abilities for industrial applications, which are high corrosion inhibiting properties and excellent lubrication performances. This work is believed to be instructive for designing multifunctional ILs and promoting the ILs' application in industry in the future.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 21
·e202300754
·
IF 8.4
Jing Guo,Feng Li,Yuting Chu,Peng Zou,Chuang Li
Graphical The 10 % Ni@CeOx catalyst exhibits excellent catalytic efficiency in the reduction amination of levulinic acid to prepare 1,5-dimethyl-2-pyrrolidone. 1,5-dimethyl-2-pyrrolidone (MNMP), as a highly efficient green solvent, can be obtained from biomass-derived levulinic acid and its esters with 100 % conversion and 96.8 % yield over a 10 % Ni@CeOx catalyst at 140 °C, 2 MPa H 2 , 8 h, and with water as the solvent. Structure-property correlation investigations were performed with diverse characterization methods, including BET, XRD, XPS, TEM, HAADF-STEM, H 2 -TPR, NH 3 -TPD, CO 2 -TPD and FT-IR, and the results revealed that the excellent catalytic performance of the 10 % Ni@CeOx catalyst was mainly resulted from the strong interaction between Ni and CeOx, which formed more catalytic active sites and contributed to higher reductive amination efficiency. Besides, the 10 % Ni@CeOx catalyst had a chemisorption effect on LA. This was also the key to the excellent catalytic activity of the 10 % Ni@CeOx catalyst. The 10 % Ni@CeOx catalyst exhibited great stability throughout 6 reaction runs and excellent catalytic efficiency in the kilogram scale preparation of MNMP. This work provides a low-cost, efficient, and environmentally friendly heterogeneous catalytic system for the production of MNMP.
研究领域:
催化化学
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绿色化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
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
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
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
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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
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化工工程
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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
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
·
IF 2.369
Yang Li,Yang Zhang,Xue Zhong Wang
The solubility of dimethyl 2,2′-azobis(2-methylpropionate) (AIBME) was determined in 15 pure solvents, including cyclohexane, dichloromethane, diethyl ether, acetone, tetrahydrofuran, ethyl acetate, tetrachloromethane, acetonitrile, methylbenzene, methanol, ethanol, n-propyl alcohol, isopropanol, n-butyl alcohol, and iso-butyl alcohol, and in a binary solvent system (methanol + water) at the temperature range from 253.15 to 293.15 K at atmospheric pressure. Between 278.15 and 293.15 K, the solubility of AIBME is more sensitive to temperature in alcohol solvents than in other solvents. However, the solubility of AIBME in nonalcoholic solvents decreased more rapidly than in alcohol solvents below 278.15 K. The AIBME solubility in the binary solvent system (methanol + water) is positive to temperature and the initial mole fraction of methanol. The measured solubility data of AIBME in pure solvents were correlated by the modified Apelblat equation, the λh equation, the nonrandom two-liquid (NRTL) model, and the Wilson model. The measured solubility data of AIBME in binary solvent systems were correlated by the modified Apelblat equation, the nonrandom two-liquid (NRTL) model, and the Wilson model. Among the four models, the NRTL model is the best model to fit the solubility of AIBME, especially in alcohol solvents. In addition, the mixing properties of AIBME in 15 pure solvents, including standard mixing Gibbs energy, mixing enthalpy, and mixing entropy, were calculated and discussed. The results provide useful information for practical optimization of AIBME crystallization processes.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
COMBUSTION AND FLAME
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2023
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IF 4.4
Jinhu Liang,Ruining He,Shashank S. Nagaraja,A. Abd El-Sabor Mohamed,Haitao Lu,Yousef M. Almarzooq,Xiaorui Dong,Olivier Mathieu,William H. Green,Eric L. Petersen,S. Mani Sarathy,Henry J. Curran
2,3-Dimethyl-2-butene (TME) is a potential fuel additive with high research octane number (RON) and octane sensitivity ( S ), which can improve internal combustion engine performance and efficiency. However, the combustion characteristics of TME have not been comprehensively investigated. Thus, it is essential to study the combustion characteristics of TME and construct a detailed chemical kinetic model to describe its combustion. In this paper, two high-pressure shock tubes and a constant-volume reactor are used to measure ignition delay times and laminar flame speeds of TME oxidation . The ignition delay times were measured at equivalence ratios of 0.5, 1.0, and 2.0 in “air”, at pressures of 5 and 10 bar, in the temperature range of 950 – 1500 K. Flame speeds of the TME/ “air” mixtures were measured at atmospheric pressure, at a temperature of 325 K, for equivalence ratios ranging from 0.78 to 1.31. Two detailed kinetic mechanisms were constructed independently using different methodologies; the KAUST TME mechanism was constructed based on NUIGMech1.1, and the MIT TME mechanism was built using the Reaction Mechanism Generator (RMG). Both mechanisms were used to simulate the experimental results using Chemkin Pro. In the present work, reaction flux and sensitivity analyses were performed using the KAUST mechanism to determine the critical reactions controlling TME oxidation at the conditions studied.
研究领域:
燃料化学
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燃烧科学
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DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2025
·Vol. 98
·期 13
·3009-3016
·
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
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热力学
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产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 4
·674-679
·
IF 1.071
Shen Xizhou,Song Hao,Fang Liuya,Deng Hang,Gan Feng,Shen Zhi
Since the content of thiophene in coking crude benzene is high, it is necessary to remove it from coking crude benzene for efficient utilization. In this study, an important intermediate, N, N -dimethyl-2-thiophenecar-boxamide, was synthesized from thiophene and dimethylcarbamyl chloride. The influences of the dosages of dimethylcarbamyl chloride and ZnCl 2 catalyst, reaction temperature and time on the removal rate were further explored based on the reaction kinetics. The structure of the target product was characterized by means of MS, 1 H NMR and 13 C NMR. The removal rate of thiophene was 98.14% after the reaction for 2 h and thiophene was almost removed after the reaction for 3 h under the optimal reaction conditions[a molar ratio of n (thiophene): n (dimethylcarbamyl chloride): n (ZnCl 2 )=1:12:10, 300 r/min, 318 K and 101.325 kPa]. The acylation of thiophene with dimethylcarbamyl chloride was approximately in accord with the first order kinetic equation at 303–323 K. The activation energy was 53.9850 kJ/mol and the pre-exponential factor was 1.4521×10 9 h −1 .
研究领域:
化学工程
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有机化学
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催化
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石油炼制
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
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
·
光伏技术
·
纳米技术
·
能量转换
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薄膜技术
·
太阳能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Linghui Meng,Jie Jiang,Xuesong Peng,Lin Zhu,Ruopeng Li,Yaqiang Li,Maozhong An
Developing a cyanide-free gold electrodeposition system is significant for replacing the cyanide electroplating gold plating system, which is highly harmful to the environment and toxic to human health. In our study, a cyanide-free system for electrodepositing gold (Au) coatings was proposed with AuCl as the main salt and 5,5-dimethyl hydantoin (DMH) as the Au (I) complexing agent. Through theoretical calculations and electrochemical test screening, 4,6-dimethyl-2-mercaptopyrimidine (DMP) is suitable for DMH-based gold electrodeposition and was selected as an electroplating additive. The role of DMP in gold electrodeposition was further studied. In particular, the adsorption–coordination mechanism was proposed to elucidate the role of DMP, based on calculations of the Bader charge density difference for DMP adsorbed on the gold surface and the interaction between DMP and Au+. Electrochemical tests such as cyclic voltammetry and chronoamperometry were utilized to study the impact of varying DMP concentrations on gold electrodeposition behavior. Chronoamperometric analysis indicates that Au electrodeposition obeys a 3D diffusion-controlled progressive nucleation process, independent of DMP concentration and applied potential, while the presence of DMP markedly suppresses grain growth. The addition of DMP significantly improved the surface morphology and brightness of the gold coating, resulting in a smooth and dense layer with a golden-yellow appearance. XRD results showed that the addition of DMP reduced the grain size of the Au coating from 22.1 to 15.7 nm, with the gold coating primarily growing along the Au (111) plane. The XPS test results show that the purity of the gold plating layer is high, and there is no inclusion of additives in the coating.
研究领域:
电化学
·
材料科学
·
表面工程
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理论化学
·
环境科学
✓ 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）