CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Jianing Qi,Boyu Qian,Xingxing Li,Xin Tan,Chenghao Duan,Yingying Cao,Yuan Yao,Hao Yang
High-energy fuels are widely used in the aerospace industry, and cyclopropane-based high-energy fuels have attracted to their high intramolecular energy and density. However, the precise synthesis of these compounds remains a significant challenge due to the low reactivity of carbene intermediates. Herein, ionic liquids (ILs) are proposed to catalyze alkene cyclopropanation. Among the catalytic performance of 14 ILs, N-butylmethylbenzimidazole trifluoroacetate ([BMBIm][TFA]) achieves excellent conversion (99.9%) and selectivity (97.5%). This catalyst also exhibits good substrate versatility (11 alkenes). Experimental and theoretical results confirm the synergistic catalysis of IL cations and anions: (1) The cation interacts with dicyclopentadiene through π-π interactions, effectively enhancing alkene adsorption. (2) The anion forms a highly reactive carbene intermediate, enhancing the electrophilicity of the Zn carbene to facilitate cyclopropanation. This work enables highly selective, efficient, and safe alkene cyclopropanation, offering a promising route for the industrial production of cyclopropane-based high-energy fuels.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2026
·
IF 16.8
Xinrui Li,Xiaoqiang Fan,Yihan Zhang,Minhao Zhu
An interfacial energetic hierarchy governs IL-Ti 3 C 2 T x boundary lubrication. • Termination-driven energetic inversion decouples anchoring and retention. • Retention is governed by Ti 3 C 2 T x -metal coupling rather than cation anchoring. • IL-Ti 3 C 2 T x reduces wear by 61% at 0.05wt.% via a stable tribofilm. The effectiveness of two-dimensional additives in boundary lubrication is often limited by poor dispersion stability and unstable low-shear interfaces in polar lubricants. Here, we report an ionic liquid (IL)-enabled interfacial-engineering strategy that couples surface anchoring with shear regulation at Ti 3 C 2 T x MXene interfaces. Density functional theory (DFT) calculations suggest that the imidazolium cation acts as the primary anchoring motif, showing strong, termination-sensitive binding to Ti 3 C 2 T x surface terminations, while the alkyl chain extends toward the counterface and may provide a molecular basis for an organic shear-accommodating overlayer. First-principles calculations further indicate a termination-dependent interfacial interaction trend, in which the calculated stability of the composite layer on steel is more closely associated with Ti 3 C 2 T x -Fe electronic coupling than with cation-Ti 3 C 2 T x anchoring. This trend provides a possible mechanistic basis for reconciling interfacial persistence with low shear resistance. Accordingly, IL-modified Ti 3 C 2 T x reduces wear by up to 61% at an ultralow concentration of 0.05wt.%. Tribochemical and cross-sectional TEM analyses support the formation of an 8.5 nm continuous composite tribofilm enriched with IL- and Ti 3 C 2 T x -derived species, consistent with reduced direct steel exposure during sliding. These findings offer design concepts for two-dimensional additives in polar lubricants. Download: Download high-res image (244KB) Download: Download full-size image
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高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 7
·
IF 2.515
Yifang Li,Dandan Yan,Yanhui Wu
Because of the preferential butanol selectivity of some ionic liquids (ILs), an increasing amount of research has appeared regarding their application in butanol separation. In this research, two ionic liquids, namely, 1-ethyl-3-vinylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([EVIM][Tf2N], IL1) and N-octyl-pyridinium bis[(trifluoromethyl)sulfonyl]imide ([OMPY][Tf2N], IL2), were applied to modify a mesoporous molecular sieve MCM-41. The IL-modified MCM-41 samples were characterized by XPS, BET, XRD, SEM and TEM. The ionic liquid-modified MCM-41 was incorporated into the polymer PEBA to prepare mixed matrix membranes to study the influences of the filling of IL-modified MCM-41 and operating conditions on the performance of the mixed matrix membrane for butanol pervaporation. The results indicated that the pervaporation performance of the PEBA membrane was enhanced by the incorporation of IL-modified MCM-41. When the temperature of the feeding liquid was 35°C and the mass fraction of butanol was 2.5 wt%, the 5% MCM-41-IL2-PEBA membrane showed a permeation flux of 421.7 g m−2 h−1 and a separation factor of 25.4. The permeation flux and the separation factor of the membrane increased as the temperature of the feeding liquid increased. The results of the long-period experiment suggested that the 5% MCM-41-IL2-PEBA membrane exhibited high stability within 100 h of operation.
研究领域:
化学工程
·
材料科学
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 4
·1579-1596
·
IF 2.578
Yongliang Guo,Xiaodong Chen,Jinfeng Cui,Junhong Guo,Haojun Zhang,Baoping Yang
Flame retardants (FRs) improve the intrinsic flammability of epoxy resins (EPs). However, the fundamental properties of EPs are inevitably compromised with the improvement of flame retardancy due to addition of FRs. Here, an ionic liquid (IL) octyltriphenylphosphonium-chelated orthoborate ([OTP][BScB]) has been synthesized and used as a flame-retarding additive for EP (hereafter (EP/[OTP][BScB])). Themogravimetry analysis (TGA) result indicated that the addition of [OTP][BScB] improved the residue yield during thermal degradation. Flammability and combustion tests showed the superior flame-retarding efficiency of the IL. More specifically, the addition of 3 wt% IL made EP/[OTP][BScB] pass the V-0 grade in the vertical burning test (UL-94) and achieve 32.5% value in the limited oxygen index (LOI) test. Cone calorimeter (CC) test showed that, compared with neat EP, EP/10[OTP][BScB] showed a reduction in the peak heat release rate (PHRR) and total heat release (THR) of by 39.7% and 21.8%, respectively, during combustion. Accordingly, the flame-retarding mechanisms in the gas and condensed phases were investigated in detail. In addition, tensile tests showed that the incorporation of the IL enhanced the mechanical property of EP/[OTP][BScB] to some extent. Moreover, UV–vis spectroscopy showed that the transparency of EP was basically maintained on the addition of [OTP][BScB]. Therefore, the IL [OTP][BScB] is a promising flame retardant to improve the properties of EP comprehensively.
研究领域:
材料科学
·
化学工程
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高影响因子
LANGMUIR
·
2026
·
IF 3.9
Liyuan Cai,Jingchun Wu,Miaoxin Zhang,Yangyang Hou,Xin Yu,Bo Li,Zhao Yang,Shi Fang,Chunlong Zhang
The development of efficient, environmentally benign surfactants for stabilizing microemulsions in supercritical carbon dioxide (scCO2) remains a significant challenge for enhanced oil recovery (EOR), owing to the historical reliance on fluorinated compounds and the poor stability of conventional surfactants. Herein, we report a fluorine-free supramolecular surfactant system based on a β-cyclodextrin (β-CD) and polyethylene glycol (PEG) conjugate (denoted β-CD-PEG). This conjugate is further functionalized to enable dynamic covalent cross-linking at the interface. The surfactant system leverages host–guest chemistry to anchor the ionic liquid [Bmim][Pro] via inclusion complexation, while the PEG chain ensures scCO2 solubility. The optimized microemulsion achieves an ultralow interfacial tension of 1.8 mN/m and forms a rigid, elastic interfacial film (G′ = 15.3 mN/m) through dynamic covalent cross-linking, ensuring long-term stability (>30 days). Core-flooding experiments demonstrate a reduction in the minimum miscibility pressure by 2.50 MPa and a 17.2% incremental oil recovery. The β-CD-PEG surfactant system also exhibits enhanced selectivity for extracting heavy oil components, leading to a viscosity reduction of up to 45.1% for heavy crude. This work establishes a paradigm for stabilizing complex fluid interfaces in scCO2 using supramolecular, dynamic, and fluorine-free surfactants, with significant implications for green and efficient chemical EOR processes.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Shengxi Meng,Hao Ruan,Qiannan Yu,Qiang Zhao,Caihong Wang,Yong Wu,Shuai Tan
Ionic liquids are promising to rival traditional organic solvent to develop safe electrolytes for Li-ion batteries. However, the ionic liquid-based electrolytes still suffered from issues of inferior performance and potential leakage. Here, non-ionic surfactant Brij58 was introduced into ionic liquid electrolytes (BMPTFSI/LiTFSI) consisting of 1-butyl-1-methylpyrrolidinium bistriflimide (BMPTFSI) and LiTFSI salt to construct solid-state lyotropic liquid crystals (LLCs). Self-assembly of Brij58 in ionic liquid electrolytes constructed lamellar nanostructures, which confined the ionic liquid electrolytes to form layered conducting channels. The nanoscale layered conducting channels in solid-state LLC electrolytes endowed liquid-like ion conductivity and significantly improved Li-ion transfer. Although the LLC electrolytes only consumed 50 wt % BMPTFSI/LiTFSI, the discharge capacities and rate performance of the Li-ion batteries based on LLC electrolytes was much improved comparing to that containing pristine BMPTFSI/LiTFSI. Also, the flame-retardant feature retained within the lamellar LLC electrolytes. The work paved new way for optimizing the conducting performance of IL electrolytes by constructing lamellar lyotropic LLC nanostructures.
研究领域:
材料科学
·
能源技术
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高影响因子
Journal of Energy Chemistry
·
2018
·
IF 3.886
Shichao Feng,Yuanyuan Wu,Jianquan Luo,Yinhua Wan
In this paper, AgBF 4 /[emim][BF 4 ] supported ionic liquid membranes (SILMs) were prepared successfully for CO/N 2 separation using nitrogen pressure immobilization procedures. The incorporation of AgBF 4 could decrease membrane weight loss, improve the pressure-resistant ability, and keep the critical pressure (0.45 MPa) of the SILMs. The high viscosity and undissolved AgBF 4 solids in membrane liquid would disturb gas molecular transport through membrane and give rise to the gas transport resistance. Therefore, the gas permeability decreased remarkably with increasing AgBF 4 carrier content in the membrane. When the molar ratio of AgBF 4 to [emim][BF 4 ] increased from 0:1 to 0.3:1, the CO/N 2 selectivity of the SILMs showed a great increase from ∼1 to ∼9 at 20 °C and 0.4 MPa, suggesting that AgBF 4 was an effective carrier for CO facilitated transport. The permeabilities of N 2 and CO increased at higher transmembrane pressure, indicating that molecular transport would dominate the transport process at high pressure. The temperature-dependent gas permeability followed the Arrhenius equation. Moreover, the differences between the activation energies of CO and N 2 became larger after introducing AgBF 4 , resulting in more obvious decrease in the CO/N 2 selectivity at higher operating temperature.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Lulu Deng,Yao Meng,Zhonghao Chen,Xinrui Li,Lei Wang
Plastics are essential to modern society, yet the imbalance between their massive production and inefficient end-of-life management results in severe energy loss and environmental burden. In this work, a green and functionally tunable protic ionic liquid ([TBD][Mea]) was designed through a hydrogen-bond acceptor strategy by neutralizing 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) with methoxyacetic acid (Mea). The introduction of the ether moiety enhances the hydrogen-bond accepting ability, thereby activating ethylene glycol (EG) and promoting ester bond cleavage during sustainable PET glycolysis. As a result, [TBD][Mea] catalyzed complete depolymerization of PET under mild conditions ([TBD][Mea]:PET:EG = 0.2:1:10 weight ratio, 180 °C, 1 h), affording bis(2-hydroxyethyl) terephthalate (BHET) with a high yield of 87.5%. Kinetic studies revealed a first-order reaction with an activation energy of 79.02 kJ mol −1 , consistent with DFT results showing that synergistic hydrogen–bond interactions among the ionic liquid, EG, and PET accelerate nucleophilic attack on the carbonyl carbon. This study demonstrates a metal-free, functionally tunable ionic liquid catalyst that integrates the activity of organocatalysts with the robustness of metal catalysts, offering a sustainable, solvent-based strategy for closed–loop PET recycling.
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高影响因子
ENERGY
·
2026
·
IF 9.4
Mingzhao Yang,Jipeng Luo,Peixia Qi,Hanqing Liu,Hongya Li,Jialin Deng,Yan Kou,Yawei Xu,Lunxiang Zhang,Jiafei Zhao,Yongchen Song,Quan Shi
Passive cooling technology based on the water sorption/desorption principle is a promising strategy to realize high-performance thermal management of electronic devices. Nevertheless, the practical application of this technique is severely restricted by some inherent shortcomings of sorbents, including limited water capacity, low heat storage density, and poor shape stability. Herein, a facile method is proposed to develop a novel water sorbent, in which an ionic liquid (1-ethyl-3-methylimidazole acetate, EA) is dispersed in the pores of fumed silica (SiO 2 ) by physical mixing and vacuum impregnation. The results exhibited that the fumed SiO 2 matrix successfully loaded EA, providing outstanding shape stability for the composite sorbent. Remarkably, the 55%EA@SiO 2 composite not only has an enhanced water sorption capacity up to twice that of conventional silica gel (0.6 g/g at 25 °C and 80% relative humidity), but also has a high desorption enthalpy of 1524 J/g. In addition, the 55%EA@SiO 2 can desorb moisture to absorb exterior thermal energy, reducing the surface temperature of the 3W electronic device from 75°C by 23%. Therefore, the proposed shape-stabilized ionic liquid composites show great potential for high-performance thermal management of electronic devices.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 10
·5778-5787
·
IF 2.599
Zhang Zhenlin,Zhang Zhigang,Hao Bo Nan,Zhang Hongyang,Wang Meng,Liu Ying Dan
Imidazolium-based poly(ionic liquid) (PIL) microspheres of poly(1-butyl-3-vinylimidazolium tetrafluoroborate) (P[C 4 VIm][BF 4 ]) were synthesized through a dispersion polymerization process, which was confirmed by 1 H NMR, FT-IR and SEM. Rheological measurement at different electric field strengths indicated that the P[C 4 VIm][BF 4 ] microspheres in dimethyl silicone oil (15 wt%) showed typical electrorheological (ER) performances including steady flow curves over the entire shear rate range. The ER fluid performed like a Newtonian fluid with very low shear viscosity at zero electric field, which implied the good affinity of the PIL particles with silicone oil. From the ER result, it is worth remarking that the good ER activity of the P[C 4 VIm][BF 4 ]-based ER fluid is due to the high-density ion parts which can induce strong interfacial polarization.
研究领域:
材料科学
·
高分子化学
·
智能材料
·
流变学
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Yingjie Ma,Zhike Li,Huaiyuan Wang,Haiyan Li
Polyurethane (PU) microcapsules containing [BMIm]PF 6 as a lubricant have been fabricated by interfacial polymerization. The stabilizing effect of 10 kinds of emulsifiers towards [BMIm]PF 6 ionic liquid have been delineated. A Pickering emulsion stabilized by lignin showed the best emulsification effect on highly viscous [BMIm]PF 6 . The types and reactivities of monomers have an important influence on the formation of microcapsules. Three kinds of isocyanate (IPDI, MDI, TDI) were reacted with diamines or diols to prepare the PU microcapsules in this work. The optiaml [BMIm]PF 6 @PU microcapsules were obtained when using IPDI and TETA as monomers , under conditions of 5,000 rpm emulsifying rate, 0.5 wt% concentration of lignin Pickering emulsion , and a 3:1 mass ratio of [BMIm]PF 6 /IPDI. The synthesized microcapsules have a regular and compact spherical structure, smooth outer, and inner surfaces with a mean diameter of 43 ± 15 µm, and a thickness of 3.8 µm. The core content of [BMIm]PF 6 @PU microcapsules was determined as >70%, and the initial decomposition temperature was 300 °C. The [BMIm]PF 6 ionic liquid shown excellent lubricating property, ultralow friction coefficient (decreased by 72.7%) and wear rate (decreased by 160 times) were obtained by embedding 30 wt% microcapsules into epoxy compared with pure epoxy.
研究领域:
材料科学
·
化学工程
·
高分子化学
·
润滑技术
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Haonan Qu,Yanmei Zhou,Yiming Ma,Peng Zhao,Bin Gao,Meixia Guo,Caixia Feng
Natural amino acids were chosen as excellent precursors for the synthesis amino acid protic ionic liquids (AAPILs) and they can be easily converted to cations and properties of functionalities incorporate into ionic liquid. Herein, we reported the study to catalyze hydrolysis of cellulose in 1-butyl-3-methylimidazolium chloride solvent by using different structure of AAPILs, which were synthesized via a one-step acid-base neutralization reaction. In addition, amino, hydroxyl and carboxyl functional groups on the AAPILs serving as catalytic domain and binding domain can promote cellulose hydrolysis. Moreover, a remarkable total reducing sugar yield of 67.1% was achieved by lysine derived ionic liquid within 1.5 h at 130 °C while the cellulose conversion was nearly 100%, which was attributed to its more catalytic sites. On the whole, AAPILs are promising catalysts for the differential conversion of inedible cellulose owing to its low cost, sustainable renewable and potential biodegradable.
研究领域:
生物化学
·
催化化学
·
可再生资源利用
·
绿色化学
·
生物质转化
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高影响因子
危险品化学品经营许可证（带存储）