ENERGY & FUELS
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2018
·
IF 3.024
Xiaocai Meng,Jianying Wang,Pengtao Xie,Haichao Jiang,Yongqi Hu,Tao Chang
A new series of functionalized ionic liquids (ILs) with 1,1,3,3-tetramethylguanidine ([TMG]+) cations as well as dicarboxylic acid anions {[−OOC–(CH2–CH2)n–COO–], where n = 1, 3, and 5} was synthesized, and their SO2 absorption properties were investigated. A high SO2 absorption capacity of the prepared ILs was achieved. The molar ratios of SO2 to [TMG][succinic acid] {([TMG][SUC]) (n = 1)}, [TMG][suberic acid] {([TMG][SUB]) (n = 3)}, and [TMG][dodecanedioic acid] {([TMG][DOD]) (n = 5)} were 4.76, 5.96, and 5.96, respectively. The evidence of spectroscopic measurements and quantum chemical calculations confirmed that SO2 could interact with the carboxyl and adjacent methylene groups on the anion as well as the amino group on the cation. The SO2 absorption capacity of these ILs was strongly influenced by their asymmetry and space resistance. The high symmetry and large steric hindrance could reduce the SO2 absorption capacity of ILs.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Yaotai Jiang,Xiaobang Liu,Dongshun Deng
Carboxylate ionic liquid (IL) and polyethylene glycol 200 (PEG200) mixtures are suitable for the absorption of acidic SO2 because of their unique properties. In the present work, tetraethylammonium furoate ([N2222][FA]) and choline furoate ([Ch][FA]) were blended with PEG200 to form 40 wt % ILs/PEG200 mixtures as SO2 absorbents. The solubilities of SO2 in these two ILs/PEG200 mixtures were measured at T = (303.15, 313.15, 323.15, and 333.15) K and pressure up to 1.2 bar. [N2222][FA]/PEG200 demonstrated the high SO2 absorption capacity of 7.224 mol per kg absorbent at 303.15 K and 1.0 bar. The chemisorption mechanism of SO2 by mixture was studied by Fourier transform infrared and nuclear magnetic resonance spectra, and the influence of cations on the SO2 absorption capacity was analyzed. Furthermore, the reaction equilibrium thermodynamic model was used to correlate the experimental data, and Henry’s law constant (H), reaction equilibrium constant (K0), and thermodynamic properties (ΔrGm0, ΔrHm0, and ΔrSm0) were derived. The absorption enthalpies of the two binary mixtures are −46.39 and −23.07 kJ·mol–1 for the two mixtures, respectively. Considering the low cost, biodegradability of the materials, high capacity, and low absorption enthalpy, the [N2222][FA]/PEG200 mixture was regarded to be an attractive and promising alternative to pure ILs and ordinary solvent as a desulfurizer.
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CHEMISTRY-A EUROPEAN JOURNAL
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2018
·Vol. 24
·期 18
·4620-4627
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IF 5.16
Yunhe Jin,Binshen Wang,Wenquan Zhang,Shi Huang,Kangcai Wang,Xiujuan Qi,Qinghua Zhang
Graphical Alternative bipropellants : A series of triaminocyclopropenium cation based hypergolic ionic liquids were designed and synthesized. These ionic liquids demonstrate promise as potential alternatives to toxic hydrazine derivatives in liquid bipropellant formulations (see figure). A novel family of hydrophobic triaminocyclopropenium cation based ionic liquids have been synthesized, and their structures and physicochemical properties characterized by NMR and IR spectroscopy, elemental analysis, differential scanning calorimetry, and hypergolic tests. The experimental results showed that all of these ionic liquids exhibited the expected hypergolic reactivity with the oxidizer white fuming nitric acid. Among them, the hypergolic ionic liquid based on the cyanoimidazolylborohydride anion showed excellent integrated properties, including high decomposition temperature (194 °C), high density (0.95 g cm −3 ), moderate viscosity (44 MPa s), ultrafast ignition delay time (6 ms), and high specific impulse (301.9 s); this demonstrates its potential as an environmentally friendly alternative to toxic hydrazine derivatives.
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PubMed
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 3.7
Yumiao Lu,Weilu Ding,Kun Li,Yanlei Wang,Bobo Cao,Ruirui He,Hongyan He
Ionic liquids (ILs) are an emerging class of media of fundamental importance for chemical engineering, especially due to their interaction with solid surfaces. Here, we explore the growth phenomenon of surface-confined ILs and reveal a peculiar structural transition behavior from order to disorder above a threshold thickness. This behavior can be explained by the variation of interfacial forces with increasing distance from the solid surface. Direct structural observation of different ILs highlights the influence of the ionic structure on the growth process. Notably, the length of the alkyl chain in the cation is found to be a determining factor for the ordering trend. Also, the thermal stability of surface-confined ILs is investigated in depth by controlling annealing treatments. It is found that the ordered monolayer ILs exhibit high robustness against high temperatures. Our findings provide new perspectives on the properties of surface-confined ILs and open up potential avenues for manipulating the structures of nanometer-thick IL films for various applications.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2025
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IF 2.8
Jingshi Liang,Bo Liu,Ye Wang,Delai Jiao,Xiaolin Shi,Zhiming Pan,Chunling Zhang
Ionic liquids have aroused considerable attention in the fields of polymer and materials science due to their designability and distinctive qualities. Epoxy resin (EP) with antimicrobial and stain-resistant properties is important for the service life of the material and for eliminating potential health hazards. In this study, a series of main-chain polyimidazolium ionic liquids (PIMILs) differing in the alkyl chain length of cation sizes (propyl, butyl, hexyl, octyl, decyl, dodecyl, 3,6-dioxaoctyl, and 4,7,10-trioxatridecyl) were synthesized by the Debus–Radziszewski reaction, and used as curing agents for EPs. The results of the curing conditions of their corresponding EPs revealed the regularity in the curing conditions dependent mainly on alkyl chain length. Meanwhile, the influence of the chloride anion and cation size on thermal stability, the glass transition temperature ( T g ), and thermomechanical properties of the epoxy composites were discussed, Finally, the water contact angles of thermosets ranged from 78.1° to 104.5°, and the thermosets could effectively kill multiple strains of bacteria and remove the biofilm.
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JOURNAL OF SOLID STATE CHEMISTRY
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2012
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IF 2.159
Kaisheng Yao,Weiwei Lu,Xinying Li,Jianji Wang
A novel method was proposed for successful fabrication of CuS nanostructures with various morphologies. At the ionic liquids (ILs)-modulated CHCl 3 –H 2 O interface, copper cupferronate [Cu(cup) 2 ] in CHCl 3 reacted with thiourea in water to generate CuS nanostructures via a solvothermal reaction process. The effects of alkyl chain length of imidazolium cations and nature of anions of the ILs, molar ratio of Cu(cup) 2 to thiourea, the reaction temperature and time on the morphology of the products were studied systematically. It was shown that by changing alkyl chain length of imidazolium cations and nature of anions of the ILs, CuS nanostructures with various morphologies, including flowers, urchins, large nanodisks and nanoparticles , could be obtained at the liquid–liquid interface, and the ILs played important template roles in directing the formation of CuS nanostructures. Furthermore, the as-prepared CuS samples exhibited high catalytic activity for photodegradation of methyl orange and thermal decomposition of ammonium perchlorate .
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JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Maida Akhlaq,Maliha Uroos
Phosphonium-based ionic liquids are considered superior over others imidazolium- and pyridinium-based ionic liquids (ILs) due to their stability, availability and low cost. Among phosphonium ILs, tetrabutylphosphonium (TBP)-based ILs exhibit exciting properties which make them potential candidate for academic and industrial applications. The most influential characteristics of TBP-based ILs are excellent thermal and chemical stability, affordability, faster rate, high polarity and viscosity. Their misibility with water make them even more attractive as solvents for dissolution of recalcitrant structures, enzymatic hydrolysis and extraction of biomolecules. In electrochemistry, high conductivities and wide electrochemical window make them credible electrolyte material in supercapacitor batteries. Additionally, they are slowly gaining the ground of conventional organic solvents and catalysts as greener alternatives. The most significant application of TBP-based ILs is CO 2 absorption, the proton-donating capacity of TBP cation allows the stable ylide formation and facilitates the CO 2 sorption. All in all, the outstanding physiochemical properties and applications of TBP-based ILs provide fundamental understanding of these ILs with future rational design to explore them further in many different industrial, chemical and biological fields.
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高影响因子
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
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2017
·Vol. 96
·期 5
·1647-1653
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IF 2.209
Zhan W.,Tu J. S.,Qian X. Z.,Li J.,Liu J.
Ionic liquid used in Friedel-Crafts reaction catalytic of dialkyl diphenylamine is a green environmental method. In this paper, butyl-octyl-diphenylamine (BODPA) was synthesized by the series of 1-butyl-3-methylimidazolium chloroaluminate (BMIM-AlCl 3 ) ionic liquids catalysts. Pressure differential scanning calorimetry (PDSC) was used to test antioxidant properties of BODPA in lubricating oil. The influences of various reaction parameters such as dosage of catalysts, molar ratio of diphenylamine to chloralkane, reaction temperature, and time on the alkylation catalyzed by BMIM-AlCl 3 have been studied. The molecular structure and content of alkyl diphenylamine were also characterized by FT-IR/GC-MS.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Liying Xu,Zhenlei Wang,Saidi Wang,Yanrong Liu,Xingmei Lu,Bing Yang,Ke Wang,Lijun Han,Jiayu Xin,Suojiang Zhang
The electrochemical dimerization of acrylonitrile (AN) to adiponitrile (ADN) is an essential process for nylon-66 production, but this process still faces many challenges such as low energy conversion efficiency and poor selectivity. Herein, various ionic liquids (ILs) were used as electrolyte additives to evaluate their effects on the electrochemical dimerization of AN. The addition of IL significantly enhanced the performance of the electrolytic reaction and inhibited the hydrogen evolution reaction (HER). The electrolyte containing Tetrabutylphosphonium bromide (TBPB) showed the highest faraday efficiency of adiponitrile (FEADN) of 84.5% and excellent stability at an optimal current density of 200 mA cm–2. Molecular dynamics (MD) simulations revealed that TBPB was uniformly dispersed in the electrolyte and formed a “long brush” hydrophobic layer with appropriate wettability on the electrodes. Moreover, it was observed that ILs with a more symmetrical cationic structure exhibited a better hydrophobic layer effect, favoring the dimerization of AN to ADN.
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Surfaces and Interfaces
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2025
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IF 6.3
Fenhong Song,Jiaming Ma,Gang Wang,Fukang Wang,Jing Fan
Ionic liquids (ILs) are considered to be promising electrolytes due to their excellent physicochemical properties. The wettability of the electrolyte in the electrode plays a crucial role in determining the energy storage performance of supercapacitors. Here, molecular dynamics simulations were performed to explore the wetting characteristics of aqueous IL droplets on graphene surfaces. The results show that as the water content increased to 7.41 mol/L, the contact angles of the aqueous IL droplets wetting on the graphene surface decreased by 55.3° and 47.6° for the hydrophilic and hydrophobic IL systems, respectively. To elucidate the mechanism through which water enhances the wetting behavior, the hydrogen bonds formed among molecules were analyzed. It was observed that hydrophilic groups have a higher propensity for establishing hydrogen bonds with water molecules, whereas hydrogen bonds predominantly form among water molecules in hydrophobic IL systems. Additionally, the diffusion coefficients of the ions increased as the water content rose, resulting in the formation of a denser ionic layer near the wall, ultimately enhancing the wettability of the IL droplets on the graphene surface. The findings of this study offer important insights into the design of electrode materials and the control of the electrolyte wetting performance for supercapacitors.
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LANGMUIR
·
2024
·
IF 3.7
Xiangyue Ye,Ruotong Zhang,Jiemei Zhou,Shoutian Qiu,Yong Wang
The remarkable flexibility in structural tunability and designability of poly(ionic liquids) (PILs) has garnered significant attention. Integration of PILs with membranes, novel properties, and functionalities is anticipated for applications in the fields of membrane separation. Here, we develop a facile method to prepare PIL-functionalized membranes in a one-step process by combining selective swelling-induced pore generation and ionic liquid functionalization. The block copolymer of poly(2-dimethylaminoethyl methacrylate)-block-polystyrene (PDMAEMA-b-PS, abbreviated as SDMA) films is immersed in a mixture of ethanol and bromopropane. In addition to the formation of nanoporous structures, an interfacial quaternization reaction between the PDMAEMA blocks and bromopropane occurs to generate poly(methacrylatoethyl propyl dimethylammonium bromide), resulting in the PIL-Br-functionalized membrane (SIL-Br) during the swelling process. It is noteworthy that bromopropane acting as a reactant also promotes the process of selective swelling. The water permeability of the resulting SIL-Br membrane is several times higher than that of the SDMA membrane, which is attributed to the increased pore size and significantly higher hydrophilicity of the SIL-Br membrane. In addition, the anion exchange of SIL-Br with l-proline (l-Pro) readily forms SIL-Pro-functionalized membranes (SIL-Pro), which exhibit exceptional electrical neutrality. Antifouling tests demonstrate that both SIL-Br and SIL-Pro have excellent resistance to proteins compared to the non-PIL-functionalization SDMA membrane, implying their great potential as antifouling membranes for water treatment.
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高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Yunchang Fan,Xing Dong,Lingling Yan,Dandan Li,Shaofeng Hua,Chaobing Hu,Chengcheng Pan
The toxicity of ionic liquids (ILs) was evaluated by using trypsin as biomarker. Experimental results indicated that the trypsin activity was inhibited by ILs and the degree of inhibition highly depended on the chemical structures of ILs. Primary analysis illustrated that hydrophobicity of ILs was one of the driven forces ruling the ILs-trypsin interaction. Thermodynamic parameters, Gibbs free energy change (Δ G ), enthalpy change (Δ H ) and entropy change (Δ S ) were obtained by analyzing the fluorescence behavior of trypsin in the presence of ILs. Both negative Δ H and Δ S suggested hydrogen bonding was the major driven force underlying the IL-trypsin interaction. To assess the toxicity of ILs, it should be considered the combination of the hydrogen bonding ability and hydrophobicity of ILs. A regression based model was established to correlate the relationship of the inhibitory ability, hydrophobicity and hydrogen bonding ability of ILs.
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高影响因子
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