CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Xin Wu,Xue Yang,Le Yu,Xiao Chun Chen
Aqueous zinc (Zn)-iodine (I 2 ) batteries (ZIBs) are promising large-scale energy storage systems with high safety and low cost. However, the practical application of ZIBs is hindered by the dissolution of I 3 - ions, which leads to the shuttle effect and the loss of active iodine. Herein, we adopt an electrolyte modification strategy using two imidazolium-based ionic liquids (1-butyl-3-methylimidazolium iodide ([BMIM]I) and 1-ethyl-3-methylimidazolium iodide ([EMIM]I)) as electrolyte additives to restrain the dissolution of I 3 - ions and enhance the performance of ZIBs. To be specific, the imidazole rings in [BMIM] + and [EMIM] + can be used as the proton sources, promoting the conversion of imine to protonated amines –NH + = in the polyaniline and subsequent adsorption of I 3 - ions. Therefore, the dissolution of I 3 - ions and shuttle effect are prevented, facilitating the reaction kinetics of cathode. As a proof of concept, the ZIB using [BMIM]I and [EMIM]I as electrolyte additives demonstrates remarkable cycling performance (72.2 % capacity retention after 1000 cycles) at a high current density of 20 mA cm −2 .
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Qiong Tang,Zhiping Zhao,Jun Han,Yuqi Shen,Leizhen Ge,Ting Li,Jinxiang Dong,Lei Liu
Lewis acidic ionic liquids as catalysts for alkylation reactions exhibited the potential for industrial application. Herein, the catalytic behavior of AlCl 3 -based ionic liquids with four organic ammonium salts was studied in the alkylation of naphthalene with n-octene for production of lubricating base oil, with special focus on the deactivation and recovery of ionic liquid. The Et 3 NHCl-AlCl 3 ionic liquid exhibited better catalytic performance than others due to its stronger interaction with naphthalene, as evidenced by the adsorption test of naphthalene over ionic liquids. To understand the deactivation mechanism, the deactivated catalysts were extensively characterized by FT-IR and UV–vis. The protonation effect of ionic liquids on polyalkylation products in the presence of HCl was found to aggravate the deactivation of ionic liquid. The negative effect is easily reversed by the decompression treatment on the reaction system before catalyst recovery, this method markedly enhanced the cycling durability of ionic liquids for industrial application.
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POLYMER
·
2024
·
IF 4.1
Beibei Li,Zhiwei Liu,Ying Dan Liu,Yongri Liang
Polyvinyl chloride (PVC) gels, as electroactive polymers , have various applications in the fields of soft actuators and sensors. The relationship between the structure and electromechanical properties of PVC gels, however, has not been fully understood so far. In this work, the effect of different alkyl chain length of 1-allyl- imidazolium cations of tetrafluoroborate (BF 4 )-based ionic liquid (IL) on structure, mechanical and dielectric properties , bending actuation, sensing and electroadhesion properties of plasticized polyvinyl chloride/dibutyl adipate (PVC/DBA) gel were investigated. The interaction between DBA and ILs in PVC/DBA/IL gels leads to the disruption of interactions between inter-DBA molecules and subsequent formation of DBA-rich phases with DBA/IL complexes. The number of DBA-rich phases in PVC/DBA/IL gels increases as the alkyl chain length of the cation in IL increases, due to an enhanced interaction between DBA and ILs with an increase in the alkyl chain length of the cation in IL. The Young's modulus of the PVC/DBA gel was slightly reduced, while the dielectric constant significantly increased when IL was added. Additionally, the bending actuation properties and capacitance pressure sensing sensitivity of the PVC/DBA/IL gel increased with an increase in the alkyl chain length of the cation of IL. However, there was an opposite trend observed for electroadhesion peel strength . Among the studied PVC/DBA/IL gels, the bending displacement, pressure sensing sensitivity, and electroadhesion peel strength of PVC/DBA/IL gel with 3.2 wt% of 1-allyl-3-butylimidazolium tetrafluoroborate ([ABIM]BF 4 ) increased by 2.6 times, 7.5 times, and 1.7 times compared to PVC/DBA gel, respectively. These results provide new insights into understanding the relationship between structure and electromechanical properties of PVC gels for their application in actuation, sensing, and electroadhesion integrated soft grippers.
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CHEMISTRY LETTERS
·
2025
·Vol. 54
·期 2
·
IF 1.1
Cao Yudi,Chen Qingshan,Wang Lei,Yang Mingqing,Zhang Shiyu,Niu Chunhui,Lv Yong
In this study, we develop a simple method for efficiently preparing poly(2,2′-bithiophene) flexible electrochromic devices. The poly(2,2′-bithiophene) films are fabricated in the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate. The poly(2,2′-bithiophene) films are characterized by Fourier transform infrared spectroscopy, scanning electron microscope, and ultraviolet-visible absorbance spectroscopy. The poly(2,2′-bithiophene) films exhibit electrochromic behavior, transitioning from an orange-red color in its reduced state to a dark green upon oxidation, particularly pronounced in the near-infrared region. Further studies demonstrate that poly(2,2′-bithiophene) films exhibits flexibility, allowing it to be bent and folded. This method for fabricating poly(2,2′-bithiophene) films shows promising potential for future applications.
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Sustainable Materials and Technologies
·
2024
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IF 8.6
Rui Cai,Guangjin Hu,Yujie Chenyang,Zhixing Huang,Xiaohang Wang,Benyong Han
Five new amino-acid-functionalized methanesulfonate ionic liquids ([AAH][CH 3 SO 3 ]-ILs) were prepared using methanesulfonic acid and amino acids (AAs). The catalytic performances of the five synthesized [AAH][CH 3 SO 3 ]-ILs were evaluated for biodiesel synthesis via the esterification of oleic acid with methanol. Among them, IL [GluH][CH 3 SO 3 ] exhibited the optimal catalytic activity in the oleic acid esterification. An experimental design based on the RSM-BBD was used to optimize the reaction conditions. A conversion rate of 96.8 % was attained using the [GluH][CH 3 SO 3 ] catalyst for the oleic acid esterification at a catalyst load of 12 wt%, a molar ratio of 19.6:1, a reaction time of 3.5 h and a temperature of 103 °C. The [GluH][CH 3 SO 3 ]-catalyzed oleic acid esterification followed first-order kinetics with the activation energy and frequency factor of 9.86 kJ·moL −1 and 0.47 min −1 , respectively. The catalytic activity of the [GluH][CH 3 SO 3 ] catalyst did not considerably change during ten consecutive cycles of the esterification reaction. Operational simplicity, high conversion rate along with good reusability makes the IL [GluH][CH 3 SO 3 ] a promising catalyst for replacing traditional catalysts for the biodiesel preparation via the fatty acids esterification.
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Sustainable Energy & Fuels
·
2024
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IF 5
Yu Cao,Kejie Jiang,Dongshun Deng
Ammonia (NH3) is one of the most important industrial chemicals and also shows potential application as hydrogen energy vector. The separation and storage of NH3 play key role for its safe transportation and effective utilization. In present study, five thiocyanate-based pseudo ionic liquids (PILs) with ultra-high NH3 absorption capacity were proposed as innovative NH3 absorbents. The effects of the cation species, temperature, and pressure on their NH3 absorption performance were experimentally evaluated. PILs involved progressive liquefaction from solid to liquid state upon integration with NH3. The outstanding NH4SCN demonstrated robust and reversible absorption capacity of 0.402 g NH3/g PIL at 303.15 K and 0.1 MPa, markedly higher than the majority of ionic liquids (ILs) and deep eutectic solvents (DESs) reported to date. Furthermore, the NH3 absorption mechanism and liquefaction process were comprehensively elucidated using NMR and FTIR spectroscopy, quantum chemical calculation, and molecular dynamics simulations. Results showed that absorption process involved six consecutive steps of NH3 adsorption, NH4+ formation via proton transfer, NH4+ diffusion, solid surface area expansion, ion migration, and final liquefaction. The binding enthalpy of NH3 was correlated with the molar capacities for PILs and exhibited moderate -58.13 kJ/mol for NH4SCN.
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高影响因子
ANALYST
·
2011
·Vol. 136
·期 11
·2294-2305
·
IF 3.913
Ya Yuan,Yuzhi Wang,Ran Xu,Meidong Huang,Huan Zeng
A micelle-mediated extraction technique, i.e. ionic liquid-based microwave-assisted extraction (ILs-MAE) technique has been developed for the effective extraction of podophyllotoxin from three Chinese medicinal plants. Several operating parameters were successively optimized by single-factor and L9 (34) orthogonal array experiments. 1-Butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]), 1-decyl-3-methylimidazolium tetrafluoroborate ([demim][BF4]) and 1-allyl-3-methylimidazolium tetrafluoroborate ([amim][BF4]) were selected as the optimal surfactants for Dysosma versipellis, Sinopodophyllum hexandrum and Diphylleia sinensis, respectively. Compared with other extraction techniques, such as ionic liquids-based maceration extraction (ILs-ME), heat extraction (ILs-HE) and ultrasound-assisted extraction (ILs-UAE), the ILs-MAE technique not only took a shorter time but also afforded a higher extraction rate of podophyllotoxin from the herbs. Reversed phase high performance liquid chromatography was employed for the analysis of podophyllotoxin. The results showed that the linearity for analyzing podophyllotoxin in all three herbs was in the concentration range of 0.005–0.4 mg mL−1 with the correlation coefficient between 0.9993 and 0.9996. LODs were 2.05–2.58 μg mL−1 and RSDs of inter-day stability were less than 5.8%. Repeatability and intermediate precision were separately lower than 3.3% and 6.3%. The recoveries for podophyllotoxin extracted with the ILs-MAE technique were in the range of 97.1–102% and all RSDs were lower than 3.0%. Furthermore, the mechanism of ILs-MAE was preliminarily studied by means of kinetic mechanism, surface structures and chemical compositions of samples before and after different extraction techniques. On the basis of the destruction of herb surface microstructures and high solubility of ILs, the ILs-MAE technique eventually got the maximum yield value.
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PubMed
高影响因子
CARBON
·
2025
·
IF 11.6
Zhaozhao Yang,Pengyang Li,Xiaoli Li,Guoqing Chen,Haohao Ren,Bo Wang,Ruiyuan Zhang,Hang Guo,Yang Zhang
Using amino acid ionic liquids (Ser–TEA) as surface modifiers and citric acid (CA) the carbon source, ionised carbon quantum dots (Ser–CA/CQDs) of uniform size were successfully prepared in this study. They exhibited excellent dispersion stability and tribological performance in an ethylene glycol aqueous solution (EGaq), as revealed using a one-step pyrolysis method. Macroscopic experimental results show that adding 2.0 wt % Ser–CA/CQDs reduces the friction coefficient of EGaq from 0.16 to 0.128, and the wear scar volume decreases by 51.97 %, which is attributed to the formation of a hydration layer and tribofilm. Furthermore, molecular dynamics simulations at the microscopic level revealed that the weak interaction energy between Ser–CA/CQDs and the friction pair surface, combined with the "ball-bearing effect", significantly reduced frictional resistance. Further, the lubrication performance of EGaq improved with the formation of a carbon film and an interface with low shear strength. This process offers a novel atomic-level perspective for understanding and optimising the applications of nanolubricant additives.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2025
·
IF 3.7
Pengcheng Hu,Aonan Lai,Shufeng Zhou
The composite membrane of microcrystalline cellulose (MCC) with polyvinyl alcohol (PVA) was effectively synthesized using ionic liquids (ILs) as the solvent and dimethyl sulfone (DMSO) as the co-solvent through the phase conversion method. The effects of IL structure and the IL/DMSO mass ratio on the solubility of MCC were investigated. The findings indicated that the composite solvent functioned as a non-derivative solvent for MCC dissolution. The inclusion of DMSO decreased the viscosity of ILs and enhanced the rate of MCC dissolution. The solubility of MCC reached 14.5% (mass) when the mass ratio of [Bmim]Cl to DMSO was 1:1. The fabricated MCC membrane exhibited a smooth surface and a dense structure. PVA@MCC demonstrated exceptional mechanical properties and a uniform structure at a mass ratio of 2:1, with an elongation at break of 76% and a tensile strength of 14.6 MPa. The effects of antibacterial agents on the morphology, transmittance, mechanical properties, and antibacterial efficiency of PVA@MCC were investigated. The findings revealed that PVA@MCC fortified with clove oil showcased a flat and smooth surface, devoid of stratification or aggregation, and demonstrated superior mechanical properties compared to its counterparts with chitosan and ZnO additions. The elongation at break of PVA@MCC with clove oil increased to 137.6%, while its tensile strength decreased to 10.4 MPa. PVA@MCC with clove oil exhibited an antibacterial efficiency exceeding 68% against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa, thereby extending the shelf life of cherry tomatoes by an additional four days at ambient temperature.
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TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Kun Cui,Fan Xu,Bingyu Tian,Mengyao Liu,Yingying Yao,Haolin Li,Ping Wen,Rui Dong,Mingjin Fan
The poor wear resistance of titanium alloy makes it challenging to develop high-performance lubricating materials. For the characteristic of highly designable structure, ionic liquids (ILs) are the potential lubricants with excellent physicochemical properties and lubricating performance. Herein, three protic phosphorus-based ionic liquids (PPILs) were designed and synthesized with the exploration of their interfacial lubrication behavior and interaction mechanism on the titanium substrate. The as-synthesized IL lubricants exhibit optimal tribological properties on steel-titanium friction pairs even at high load and temperature. The surface analysis showed that IL can form the lubricating protective film on the titanium-based metal surface, effectively reducing the adhesive wear . Combined with surface analysis techniques (SEM, XPS , FIB-TEM and TOF-SIMS), the lubrication mechanism was discussed systematically.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2025
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IF 4
Shang Yu-Jie,Guo Bian-Bian,Li Hao-Nan,Li Yong-Jin,Yang Jing
The recovery of ionic liquids (ILs) has attracted growing attention as an indispensable process in “green” industrial applications. Forward osmosis (FO) has proven to be a sustainable method for concentrating the very dilute aqueous solutions of ILs at ambient temperature, in which semi-permeable membranes play a vital role in determining the recovery efficiency. Herein, we use interfacial polymerization method to prepare thin-film composite membranes consisting of polyamide skin layer and electrospun nanofibrous substrate with tunable water permeability and IL selectivity for osmotic enrichment of imidazolium ILs from their dilute aqueous solutions through FO process. The resulting FO membrane shows a compact polyamide layer with a thickness of 30–200 nm, guranteeing a high selectivity to ILs and water. Meanwhile, the nanofibrous substrate with large and interconnect pores as well as low tortuosity, providing mechanical and permeable support for the composite membranes. IL structure influences the osmotic pressure difference as well as the interactions with polyamide layer of the membrane and thus determines the whole concentration process. First, the alkyl chain growth augments the osmosis pressure difference between the ILs solution and draw solution, resulting in an enhancement in driving force of water osmosis and IL enrichment. Moreover, alkyl length aggravates external concentration polarization caused by the enhanced adsorption of ILs onto the skin layer via electrostatic and alkyl- π interactions. Meanwhile, such adsorbed ILs further enhance the IL retention but decrease the reverse salt diffusion. Therefore, imidazolium ILs with varied alkyl lengths are ultimately enriched with a 100-fold increase in concentration from their dilute aqueous solutions with high IL/NaCl rejection and low IL loss. Remarkably, the final concentration of IL with longest alkyl length reaches the highest (6.4 mol·L −1 ). This work provides the insights in respect to material preparation and process amelioration for IL recovery with high scalability at mild conditions.
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CHEMICAL PHYSICS
·
2024
·
IF 2
Xinyuan Zhang,Xinyao Tang,Zhenhai Zhong,Xinyi Ge,Qingguo Zhang
The hydroxylammonium ionic liquids (ILs) falling within the category of protic ionic liquids (PILs) have garnered attention from researchers, owing to their outstanding solubility properties. A one-step method was employed to synthesize a series of ethanolamine ILs. The thermodynamic properties of the ILs, including surface tension, density, and electrical conductivity, were measured across varying temperatures. Essential parameters such as thermal expansion coefficient, molecular volume, surface entropy, and surface energy were estimated using empirical equations. In order to elucidate the intermolecular interactions within the ethanolamine carboxylate ILs, the sigma profiles of ILs were determined using COSMO-RS. It was observed that the ethanolamine cation has a strong potential as a H-bond donor, while the carboxylate anion demonstrates significant capability as a hydrogen bond acceptor. By DFT calculations, it was observed that the N H in the ethanolamine cation can form H-bonds with the oxygen atom in the carboxylate anion.
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危险品化学品经营许可证（带存储）