COLLOID AND POLYMER SCIENCE
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2019
·Vol. 297
·期 4
·571-586
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IF 1.906
Sun Yu,Xu Xiaoqing,Qin Mengyi,Pang Nanjiong,Wang Guowei,Zhuang Linghua
Four dodecyl sulfate-based anionic surface-active ionic liquids were synthesized. Physicochemical parameters of surface-active ionic liquids (SAILs) or SAIL/gelatin aqueous solutions were demonstrated. Critical micelle concentration (cmc) values of [Emim][C 12 H 25 SO 4 ], [Amim][C 12 H 25 SO 4 ], [Bmim][C 12 H 25 SO 4 ], and [Etmim][C 12 H 25 SO 4 ] were 2.10 mmol/L, 1.95 mmol/L, 0.95 mmol/L, and 0.86 mmol/L at 298.15 K, respectively. cmc values of four SAILs followed the decreasing trend: [Emim][C 12 H 25 SO 4 ] ≈ [Amim][C 12 H 25 SO 4 ] > [Bmim][C 12 H 25 SO 4 ] ≈ [Etmim][C 12 H 25 SO 4 ]. The alkyl chain length (ethyl to butyl group) and electron absorption effect (carboxylate ester or allyl group) of substituent in cationic imidazolium groups played important role in micelle formation of SAILs. cmc values of SAIL/gelatin aqueous solutions were lower than those of SAILs. Micelle formation (SAIL or SAIL/gelatin) was spontaneous, exothermic, and entropy-driven. From DFT calculation, typical hydrogen bonds were found between active hydrogen atom of imidazole ring and oxygen, sulfur atoms of sulfate anion group. The information obtained would provide guide for design and synthesis of novel SAILs for wide gelatin application.
Graphical abstract
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Yuanchao Pei,Qiuping Lu,Yajuan Niu,Yang Zhao,Yuling Zhao,Zhiyong Li,Huiyong Wang,Jianji Wang
Aggregation of surfactants in ionic liquids (ILs) is poorly understood in spite of their great potential for applications in many fields. In this paper, the aggregation behavior of pyrrolidinium IL surfactants [Cnmpyr]Br (n = 10, 12, 14, and 16) in −OH-functionalized protic ionic liquids (PILs), including ethanolammonium nitrate (EOAN), ethanolammonium formate (EOAF), and 3-amino-1-propanol nitrate (POAN), has been studied by surface tension and 1H NMR methods. The effect of the structure of PILs on the aggregation behavior of the IL surfactants is investigated and compared with that in ethylammonium nitrate (EAN) and water solvents. It is found that adding an −OH group in PIL cations significantly reduces the critical micelle concentration (cmc), while increasing the alkyl chain length of the PILs cations leads to an increase in the cmc values. However, the effect of anion type of the PILs on the aggregation is not pronounced for the investigated ILs. Thermodynamic analysis reveals that the aggregation behavior in EOAN is driven by enthalpy and entropy contributions. In addition, the change in the chemical shift of various protons in the IL surfactants and EOAN has been used to analyze the conformational changes of the IL surfactants in the aggregation process. The results reveal the importance of −OH-functionalized PILs in the development of designer IL-based colloidal systems for chemical reactions and materials synthesis.
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JOURNAL OF SEPARATION SCIENCE
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2019
·Vol. 42
·期 9
·1757-1767
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IF 2.516
Xiaoyong Zhao,Ge Ma,Datong Wu,Pengfei Cai,Yuanjiang Pan
In the present work, three hydrophilic ionic liquids based on the combination between imidazolium cations attached with ethylene glycol polymers of various lengths and hexafluorophosphate anion were designed and synthesized for the separation of polysaccharides. By employing dextran 100 kDa as model compound, the effects of ionic liquid content, solvent/anti-solvent volume, and temperature on its recovery efficiency were investigated systematically. The ability of these ionic liquids to precipitate dextran 100 kDa, increases with the elongation of ethylene glycol polymer chain. The established ionic liquid-based precipitation system was successfully applied to selectively precipitate polysaccharides from water extracts of three traditional Chinese medicines and the precipitation could be achieved in about 15 min. In addition, the different precipitation responses of acidic, neutral, and basic polysaccharides in the ionic liquid-based precipitation system and theoretical calculations both suggested that the selective precipitation of polysaccharides was probably mediated by interaction between ionic liquids and polysaccharides. The proposed strategy facilitated the isolation and purification of polysaccharides and may trigger a novel application of ionic liquids in carbohydrate research.
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Advanced Composites and Hybrid Materials
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2019
·Vol. 2
·期 2
·279-288
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IF 0
Li Shihua,Yang Chunying,Sarwar Shatila,Nautiyal Amit,Zhang Pengfei,Du Haishun,Liu Na,Yin Jialin,Deng Kuilin,Zhang Xinyu
As one of the most investigated conducting polymers, polyaniline (PANI) is considered to be of practical use in many applications. In this study, two new ionic liquids, 1-methylimidazolium hydrogen sulfate ([Hmim]HSO 4 ) and 1-methyl-3- n -butylimidazopersulfate ([C 4 mim] 2 S 2 O 8 ), which were synthesized from 1-methylimidazole ([Hmim]), were used as solvent and dopant, oxidizer, respectively, for in situ polymerization of aniline. Because of the application of the unique structure of ionic liquid, we obtained the ionic liquid–doped polyaniline (IL-PANI) with high solubility (25 mg mL −1 in dimethyl sulfoxide (DMSO)). And by adjusting the ratio of [C 4 mim] 2 S 2 O 8 to aniline monomer, the preferred PANI nanofibers could be controlled to form a three-dimensional porous structure. It was found that the ion/electron transport channels could be formed inside the 3D structure. Thus, the redox reactions could occur both at the surface and inside the PANI electrode. Electrochemical characterization showed that the fabricated PANI electrode exhibited a specific capacitance of 489 F g −1 at a current density of 0.5 A g −1 . Also, the capacity retention rate reached up to 81% after 4000 cycles investigated at 2 A g −1 . In addition, a high-energy density of 80.2 Wh kg −1 was measured when [Hmim]HSO 4 was used as an electrolyte. Thus, the present work suggested a new strategy for fabricating high-performance PANI electrode for supercapacitor applications.
Ionic-liquid templated assembly of conducting polymer nanostructures for energy applications.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 20
·7725-7732
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IF 3.069
Yun Hao,Ying-juan Hao,Jie Ren,Biao Wu,Xiao-jing Wang,Dishun Zhao,Fa-tang Li
In this work, N-methyl-2-pyrrolidonium (NMP) was acidized using hydrochloric acid to obtain [Hnmp]Cl first, which was then reacted with FeCl3 to prepare a series of inexpensive tunable [Hnmp]Cl·xFeCl3 (x = 0.2–2.0) ionic liquids (ILs) for the extractive and oxidative desulfurization of model oils. The Lewis acidities of these ILs were tested by the Fourier transform infrared (FT-IR) method, which indicated that when the x value of [Hnmp]Cl·xFeCl3 was above 1.0, the ILs exhibited Lewis acidity. The extraction results showed that the acidification of NMP reduced its dissolubility ability toward dibenzothiophene (DBT) and its Lewis acidity played a determining role in extractive desulfurization. In the catalytic oxidation removal process of the DBT model oil in the presence of H2O2, electron paramagnetic resonance (EPR) and scavenger experiments showed that the hydroxyl radical (˙OH) plays a key role and the superoxide anion radical (O2˙−) has a minor function. [Hnmp]Cl·1.5FeCl3 IL showed excellent recycling performance, which was due to its high dissolving capacity (23 700 ppm) for dibenzothiophene-sulfone (DBTO2).
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DALTON TRANSACTIONS
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2019
·Vol. 48
·期 45
·17106-17116
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IF 4.052
Yingjie Xie,Qian Zhao,Guofang Gao,Tingshun Jiang
There is special significance to composite catalysts using SBA-16 nano-cages as carriers in the acid catalysis field. A method for embedding boron atoms onto SBA-16 to increase acidic sites and enhance the acidity of the nano-cages was described. The tungstosilicic acid type ionic liquid (SWIL) was encaged into B-SBA-16 acidic nano-cages to obtain various composite catalysts. The acidic nano-cages and composite catalysts were characterized by FT-IR, TG/DSC, SAXD, BET, SEM, TEM, XPS and 1H NMR analyses. Research confirmed that boron was embedded onto the SBA-16 nano-cages in varying proportions and the obtained B-SBA-16 acidic nano-cages still maintained a high degree of pore ordering. The SWIL was successfully encapsulated into the acidic nano-cages via the immersion method. The cage-encapsulated tungstosilicic acid type ionic liquid catalysts SWIL/B(n)-SBA-16 were applied to catalyze the ketal reaction of cyclohexanone (CYC) with ethylene glycol (EG). The results showed that the conversion of CYC could reach 92.01% along with the yield of cyclohexanone ethylene glycol ketal (CGK) of 83.87% under ideal conditions. The CYC conversion was still nearly 86.86% and the CGK yield was 69.50% even after 8 times of continuous reuse.
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DALTON TRANSACTIONS
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2019
·Vol. 48
·期 7
·2300-2307
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IF 4.052
Xiao-Yan Luo,Xiao-Yan Chen,Rong-Xing Qiu,Bao-You Pei,Yi Wei,Min Hu,Jin-Qing Lin,Jing-Yang Zhang,Geng-Geng Luo
In this work, an efficient strategy for improving CO2 capture based on anion-functionalized ionic liquids (ILs) by reducing cation–anion interactions in ILs was reported. The influence of the cationic species on CO2 absorption was investigated using 2-hydroxyl pyridium anions ([2-Op]) as a probe. CO2 capture experiments indicated that the CO2 absorption capacity in [2-Op] anion-based ILs varied from 0.94 to 1.69 mol CO2 per mol IL at 30 °C and 1 atm. Spectroscopic analysis and quantum chemical calculations suggested that the increase of the CO2 absorption capacity may be ascribed to the reduction of the strength of cation–anion interactions in ILs, and stronger cation–anion interactions would make one CO2 site in the [2-Op] anion inactive. Furthermore, the effect of the cation unit on the anion was evidenced by FT-IR spectra, implying that strong interactions between ions may lead to the decrease of the IR absorption wavenumber of hydroxy pyridium and work against CO2 capture. Following this strategy, it was finally found that [Ph-C8eim][2-Op] (Ph-C8eim = 1-N-ethyl-3-N-octyl-2-phenylimidazolium) with weaker cation–anion interactions exhibited a significant increase in the CO2 uptake capacity, and extremely high capacities of 1.69 and 1.83 mol CO2 per mol IL could be achieved at 30 and 20 °C, respectively. The study presented here would be helpful for further designing novel and effective ILs for advancing CO2 capturing performance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Jiahao Ren,Lan Zheng,Yuqi Wang,Xiyu Zang,Jinqiao Wu,Yijun Yue,Xiaolong Han,Le Wu
To improve the diesel conductivity and avoid the electrostatic spark explosion/fire accidents, a series of room temperature ionic liquids (ILs) were synthetized by four kinds of long-chain alkyl quaternary ammonium salt (DTAC, TTAC, HTAC and STAC) and n-butyl naphthenate sulfonic acid using ultrasound method, which were added into the diesel as antistatic agents . Nuclear magnetic resonance spectrum (NMR), Fourier transform infrared spectrometer (FT-IR), thermogravimetric analysis (TGA) and element analysis (EA) were employed to characterize the structures and properties of the ILs, confirming the successful synthesis of the ILs. Experimental results indicated that the prepared ILs can significantly improve the diesel antistatic ability even at ppm level, while the ILs showed an acceptable effect on the diesel combustion performance. The mechanisms of action were also clarified and discussed based on the reverse micelles (RM) microstructures and physicochemical properties of the synthesized ILs. It should be noted that the new diesel antistatic agents have a few features such as high efficiency, lasting effects, mild reaction conditions and low cost, which is bound to have broad application prospect for diesel antistatic accordingly.
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JOURNAL OF MOLECULAR LIQUIDS
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2012
·
IF 1.58
Mengyin Hou,Yingjie Xu,Yajuan Han,Bin Chen,Wenxia Zhang,Qinghua Ye,Jinzhi Sun
Densities ( ρ ), refractive indices ( n D ) and electrical conductivities ( κ ) of ethylammonium acetate (N2Ac) protic ionic liquid + water and propylammonium acetate (N3Ac) protic ionic liquid + water binary mixtures over the entire composition range were measured at 298.15 K under atmospheric pressure. The excess molar volumes ( V E ), apparent molar volumes ( V ϕi ), partial molar volumes ( V ¯ m , i ) and excess partial molar volumes ( V ¯ m , i E ) of the binary mixtures were calculated from the density data. The refractive index deviations (Δ n D ) of the binary mixtures were determined using the refractive index data. The excess molar volumes and refractive index deviations were correlated with the Redlich–Kister equation. The excess molar volumes of the above-mentioned systems are negative over the whole composition range, while the refractive index deviations are positive. The concentration dependence of electrical conductivity was fitted according to the empirical Casteel–Amis equation. The intermolecular interactions and structural effects were analyzed on the basis of the measured and the derived properties.
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International Journal of Greenhouse Gas Control
·
2014
·
IF 3.821
Hui Hu,Fang Li,Qi Xia,Xiaodan Li,Li Liao,Maohong Fan
Ionic liquids (ILs) are varieties of green solvents that can capture CO 2 effectively. In this research, five synthesized amino ILs were evaluated for their CO 2 absorption performance. Experimental results showed that more amino groups in ILs led to higher CO 2 absorption capacities. For factors such as temperature, gas flow rate, and water content, water content had the most significant impact on the capacity to absorb CO 2 . A CO 2 absorption capacity of 0.96 mol-CO 2 /mol-IL was achieved with [TETAH] + [BF 4 ] − , with the IL containing 0% water and a gas flow rate of 100 ml/min at 293 K. However, when the water content of [TETAH] + [BF 4 ] − reached 40%, CO 2 absorption capacity increased to as high as 2.04 mol-CO 2 /mol-IL. Also, the CO 2 absorption capacity of [TETAH] + [BF 4 ] − increased rapidly with temperature in the range of 283–333 K, but decreased at temperatures greater than 333 K. According to the absorption–desorption recycling experiment of IL 3#, the regeneration rates of ILs increase with water content from 0% to 40%, while raising temperature does not improve regeneration rates. The FT-IR, 13 CNMR, pH and conductivity characterization results indicate that CO 2 reacted with NH 2 and NH in [TETAH] + [BF 4 ] − and formed carbamate. Simultaneously, CO 2 reacted with H 2 O and released H + , thus enhancing the absorption of CO 2 . This has important implications for various projects.
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JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
·
2014
·Vol. 27
·期 6
·498-503
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IF 1.245
Yimei Tang,Xiaoling Hu,Ping Guan,Xiangping Lin,Xiaoqian Li
Using microwave-assisted synthesis method, a series of paramagnetic ionic liquids comprising 1-vinyl-3-alkylimidazolium VRIM + cation and tetrahalogenidoferrate (III) FeCl m Br 4 − m − anion were designed and synthesized. The structure was analyzed using 1 H NMR and Raman spectroscopy. Ultraviolet–visible absorption spectra, thermal stability, magnetic susceptibility, viscosity, ionic conductivity, and solubility were characterized. Results show that elongation of the alkyl chain leads to replacement of bromides with a small amount of chlorides in the anion, shifting of UV maximum absorption peaks to shorter wavelengths, reduction of ionic conductivity, and solubility in polar solvents, as well as increase in fluidity, magnetic susceptibility, and solubility in nonpolar solvents. Copyright © 2014 John Wiley & Sons, Ltd.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Weiwei Lu,Kaisheng Yao,Jianji Wang,Jiongliang Yuan
As a class of green and designable solvents, ionic liquids (ILs) have been used extensively in inorganic synthesis. In those schemes, ILs were usually used as reaction media to replace water and organic solvents, and/or used as stabilizer and capping agents to act like an amphiphilic molecule or polymer. However, the unique properties of ILs were not fully utilized in the area of material preparation. In this study, a new protocol of “ILs–water interfacial synthesis” was developed and used for the preparation of Ag nanomaterials. Taking the advantage of tunable property of ILs–water interface, Ag nanomaterials with different morphology such as triangular nanoplates, polygonal nanoplates, and nanoparticles could be facilely obtained. Growth mechanism of the triangular Ag nanoplates has been investigated from structural characterization and molecular dynamics (MD) simulation. It was shown that growth of the nanoplates was under kinetic control mainly due to high viscosity and ionicity of the ILs. Furthermore, the antimicrobial performance of these Ag samples was tested to study the influence of shape of the Ag nanomaterials on the antimicrobial activity and the related antimicrobial mechanism. The results suggested that the efficient antimicrobial activity of the triangular Ag nanoplates was ascribed to their sharp corners and edges and large areas of active (1 1 1) crystal plane, which leads to the higher amount of leaching Ag + ion.
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危险品化学品经营许可证（带存储）