JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Hongling Fang,Yi Li,Songwei Zhang,Qi Ding,Litian Hu,Kuan Lu
Hypothesis Ionic liquids (ILs), as lubricant additives , can greatly improve the lubricating behavior of the frictional interfaces. However, it is urgent to explore ILs with good oil solubility in nonpolar oils, and it is necessary to further study and verify the lubrication mechanism of ILs from the perspective of alkyl chain length. Experiments Five protic ILs (PILs) with varying alkyl chain lengths were synthesized by proton transfer method. As additives in PAO oil, their tribological properties were investigated on SRV-V tester. Through molecular dynamics simulation , the adsorption behavior of PILs at the frictional interface was illustrated. Findings The tribological properties of base oil could be significantly improved by adding PIL additives, but interestingly, PILs with short-chain anions showed better lubricating performance, which contradicted most of the early findings. Further analyses revealed that PILs achieved effective lubrication by the tribochemical interaction between anions and frictional interface, and the formation of cationic protective layer. However, PILs with shorter-chain anions form a denser protective layer that can better support the interfacial anions to participate in tribochemical reactions and thus abnormally exhibit superior lubricating performance than those with longer-chain anions.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2015
·Vol. 145
·期 4
·1080-1088
·
IF 2.307
Liu Wentao,Wang Yanfang,Li Wei,Yang Yan,Wang Ningning,Song Zhanxin,Xia Xiao-Feng,Wang Haijun
Abstract A variety of polyethylene glycol-400-functionalized dicationic acidic ionic liquids (ILs) (PEG 400 -DAILs) were synthesized and tested in the dehydration of fructose. Among these catalysts, hydrogen sulfate anion-based ILs showed the higher catalytic performance in the conversion of fructose. The highest HMF yield of 96.5 % with 100 % consumption of fructose were obtained after 60 min at 110 °C. The effects of catalyst concentration, reaction time, reaction temperature, and solvents were systematically investigated. In addition, the generality of the catalysts was examined by processing inulin and sucrose to HMF with yield of 71.9 and 52.1 % under certain conditions, respectively. PEG 400 -DAILs possess modified physicochemical properties such as low viscosity, strong hydrophilicity and hydrogen bonding with sugars so as to improve activity for the dehydration of fructose into HMF. The used IL catalyst could be separated and recycled repeatedly without significant loss of catalytic activity. The research emphasizes preparation of the novel catalysts combining polymers with functionalized ILs for conversion of renewable biomass. Graphical abstract
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高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 11
·2764-2771
·
IF 2.799
Liu Yang,Mao Guijie,Zhao Hongyan,Song Jinyi,Han Huatao,Li Zhuofei,Chu Wenyi,Sun Zhizhong
Abstract A series of DBU-based (DBU = 1, 8-diazabicyclo [5.4.0] undec-7-ene) dicationic ionic liquids with different anions were successfully synthesized by the reaction of DBU and 1, 6-dichlorohexane. Therein, the dicationic ionic liquid 1, 1′-(hexane-1, 6-diyl)bis(1, 8-diazabicyclo [5.4.0]undec-7-enium) dichlorine ( IL-1 ) was successfully employed as an efficient catalyst in esterification reaction of carboxylic acids with primary chloroalkanes under mild conditions without any additional basic reagents. Moreover, the optimum catalyst could be efficiently reused for five times without any significant change on the catalytic effect. The improved protocol is not only efficient, but also green and pollution-free. Graphical Abstract
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高影响因子
IONICS
·
2022
·Vol. 28
·期 7
·3525-3536
·
IF 2.961
Lu Jingling,Xu Cunying,Li Jianru,Wang Shuxian,Xiang Qinqin,Chen Xiao,Hua Yixin,Li Yan
The effects of nicotinic acid (NA) on the electrodeposition of Al-Mn alloy have been investigated in aluminum chloride-1-butyl-3-methylimidazolium ionic liquids (AlCl 3 -BMIC) containing 0.15 mol·L −1 MnCl 2 (AlCl 3 -BMIC-MnCl 2 ). The electrochemical behaviors of the AlCl 3 -BMIC-MnCl 2 electrolyte have been studied here using cyclic voltammetry and potentiodynamic polarization. The addition of NA obviously increased the nucleation overpotential of Al-Mn alloy and inhibited the reduction reaction of Al(III) and Mn(II). The resultant surface morphologies, composition, and roughness of the Al-Mn alloy coating were revealed by scanning electron microscopy (SEM), transmission electron microscope (TEM), and atomic force microscopy (AFM). It was found that these additives strongly affect the morphology, composition, roughness, and crystal structure of the Al-Mn alloy coating. With the addition of NA, the content of Mn decreased, and Al-Mn alloy coatings became more uniform and smoother. The crystal structure of Al-Mn coatings was also examined by X-ray diffraction (XRD), where it was found that the phase composition of the deposits depends on the quantities of additives. For electrolyte containing little or no NA additives, the resulting alloy is amorphous structure. With NA additives up to 6·mmol L −1 , the Al-Mn coating changed into a mixture phase of amorphous and crystalline structure.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 9
·4167-4178
·
IF 3.925
Mingyu Cui,Dingkai Wang,Yanjun Li,Wei Zhao,Chong Liang,Xutang Liu,Shuiyuan Fu,Luyao Wang,Xianyong Wei
Lignin, the most abundant renewable resource of aromatics in nature, is recognized as an alternative for fossil-based fuels and chemicals. Herein, we propose an efficient method to obtain aromatic monomers by lignin depolymerization using magnetic silica supported Brønsted acidic ionic liquid (BAIL–Fe3O4@SiO2), which has higher catalytic activity and easier separate property compared with the traditional lignin depolymerization in ionic liquids. The prepared BAIL (30 wt%)–Fe3O4@SiO2 catalyst is magnetic, mesoporous, thermostable, and core–shell structured, with a diameter of 500–600 nm, BET surface area of 185.7 m2 g−1, and pore size of 4.362 nm. The results showed that in the presence of 40 wt% of BAIL (30 wt%)–Fe3O4@SiO2 at 160 °C for 3 h, the conversion of lignin increased markedly to 54.0% and 33.0% yield of aromatic monomers were acquired. Among the ethanol-soluble liquid products from lignin depolymerization over BAIL (30 wt%)–Fe3O4@SiO2, the aryl aldehyde is predominant and has a yield of 19.2%. Furthermore, other products were also detected, for which the molecular mass was less than 250 Da, the double bond equivalent value varied from 4 to 7, and the carbon number was within the range of 6–15. The reusability experiment showed that the conversion of lignin and the yield of aromatic monomers can still achieve 90.4% and 91.2% of that catalyzed by fresh catalyst after the 3rd cycle.
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高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2020
·Vol. 55
·期 9
·3182-3189
·
IF 2.773
Zhang Ye,Xing-He Tan,Zhi-Wei Liu,Rana Muhammad Aadil,Yi-Cheng Tan,Muhammad Inam-ur-Raheem
Summary The robust cell wall structure of Haematococcus pluvialis ( H. pluvialis ) consists of polysaccharides and tough non-hydrolysable sporopollenins, which makes it difficult to extract superpotent antioxidant, astaxanthin from these cells. Therefore, breakdown of cell wall is a key step in the overall process of astaxanthin recovery. In this study, the mechanism of three well-established chemical techniques for cell disruption of H. pluvialis cysts [ionic liquids (IL), hydrochloric acid (HCl) and multiple enzymes (multi-enzyme, ME)] on deconstruction of the cyst cell wall of H. pluvialis was explored and characterised by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), nuclear magnetic resonance (NMR) and gas chromatography–mass spectrometry (GC-MS) analyses. The results demonstrated that the three cell wall breakdown techniques exhibited high extraction efficacies for the recovery of astaxanthin from H. pluvialis [IL (86.71 ± 2.06%), HCl (80.52 ± 2.28%) and ME (71.08 ± 2.49%)]. However, their performances on disrupting the trilayered cell walls of H. pluvialis were significantly different, which were confirmed by distinct morphologies of the treated cell walls visualised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Meanwhile, the results of FTIR confirmed that, to some extent, cellulose, hemicellulose and lignin in the cell walls were hydrolysed by HCl, IL and ME treatments. However, ME exhibited a less hydrolytic effect on lignin than HCl and IL. Moreover, XRD and NMR analyses implied that the amorphous region of cell wall was susceptible to hydrolysis/breakdown by the three techniques.
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高影响因子
Science Advances
·
2025
·Vol. 11
·期 46
·
IF 12.5
Jin Li,Junjie Chen,Xiaosa Xu,Zhenyu Wang,Zixiao Guo,Pengzhu Lin,Jing Sun,Baoling Huang,Tianshou Zhao
Quasi–solid-state lithium metal batteries (QSSLMBs) are hindered by interfacial instability at high-voltage cathodes and uncontrolled lithium dendrite growth at the anode, limiting their cycling life and energy density. To overcome these challenges, we have developed a piperidine-based ionic liquid (IL) additive featuring a methylthiolation cationic segment that stabilizes the interphase of layered oxide cathodes and lithium anodes under fast charging and high-voltage conditions. These ILs preferentially oxidize to form a robust cathode-electrolyte interphase with LiF and sulfide species, which effectively suppresses dissolution of transition metal and enhances interfacial ion transport. Simultaneously, the IL-derived diverse inorganic species composite interphase at the anode improves mechanical strength and inhibits lithium dendrite growth. The resulting quasi–solid-state electrolyte demonstrates stable operation at a high voltage of 4.5 V, high mass loading of 21.6 mg cm −2 , high–energy density of 407 Wh kg −1 , and broad temperature range from −20° to 60°C, advancing the practical application of QSSLMBs.
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wei Liu,Bo Wang,Haifeng Dong,Mengyu Ren,Zongxu Wang,Dan Li,Yi Nie,Xiangping Zhang
Efficient CO₂/CH₄ separation is crucial for the value-added utilization of natural gas, shale gas, and biomethane. This work developed a series of tetramethylammonium-based ionic liquids (ILs) containing ethylene glycol (EG) as high-performance absorbents. Among them, the [N₁₁₁₁][1,2,4-Tz]/EG (1:1) system exhibited a high CO₂ capacity of 0.205 g/g at 40 °C and 100 kPa, together with exceptional CO₂/CH₄ selectivity (574). The separation performance was finely tuned by varying the EG content, which regulated the hydrogen-bond network within the hybrid system, leading to a remarkably low regeneration energy of 1.13 GJ·t −1 CO₂, superior to conventional ILs and amine solvents. Mechanistic studies unveiled that the hydrogen bonds between EG and IL anions not only promoted CO₂ activation but also directed the reaction pathway toward the formation of thermodynamically stable carbonate species (RCO₃ − ) rather than carbamates, thus facilitating the low-energy regeneration process. This study demonstrates that hydrogen bond modulation in EG-IL systems provides a sustainable and efficient strategy for CO₂ capture.
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Yu Deng,Yigang Ding,Zhong Huang,Ying Yu,Jun He,Yi Zhang
Two novel carboxylic acid based ionic liquids (ILs), benzyltributylammonium myristic acetate ([N 444Bn ][MA]) and benzyltributylammonium dodecanedioic acetate ([N 444Bn ] 2 [DDA]), have been rationally designed and successfully synthesized for the extraction of yttrium (denoted as Y(III)) from a chloride aqueous solution and for the separation of mixed rare earth elements (REEs). Comparison studies of the extraction performances of [N 444Bn ][MA] and [N 444Bn ] 2 [DDA] were carefully investigated under different conditions (e.g., equilibrium time, solution acidity, salting-out agent concentration, and REEs concentration). The results indicated that the extraction efficiency of Y(III) reached 87.18% after 2 min using [N 444Bn ] 2 [DDA], whereas it required 10 min to reach an extraction efficiency of 47.37% using [N 444Bn ][MA], mainly due to the larger electronegativity of the incorporated dicarboxylates in the anions of [N 444Bn ] 2 [DDA], which enhanced its coordination with Y(III) compared to [N 444Bn ][MA]. However, [N 444Bn ][MA] illustrated better selective separation behavior than [N 444Bn ] 2 [DDA] in mixed REEs solutions (including La, Nd, Eu, Ho, Yb and Y), and the selective factors of Yb and La were 16.21 and 3.30, respectively. Furthermore, the ion association mechanism, evolved from the slope analysis and FT-IR results, contributed to avoiding the saponification procedures and resultant saponification wastewater during the extraction process. In addition, the back-extraction experiments indicated that ~97% Y(III) can be stripped from [N 444Bn ] 2 [DDA] and [N 444Bn ][MA] using 1.0 M and 0.4 M HCl, respectively, demonstrating that these ILs can be further used in large-scale applications for the separation and recovery of REEs.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2017
·
IF 2.726
Dong Fu,Xue Feng,Pan Zhang
Amino acid ionic liquids (AAILs) including 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), 1-butyl-3-methylimidazolium L -lysinate ([Bmim][Lys]) and tetramethylammonium glycinate ([N 1111 ][Gly]) were used to enhance the absorption of CO 2 in N -methyldiethanolamine (MDEA) aqueous solutions. The mole fractions of CO 2 in N 2 + CO 2 gas mixtures ranged from 0.2 to 1.0. The mass fractions of MDEA and AAILs respectively ranged from 0.300 to 0.400 and 0.050 to 0.100. The absorption capacity and absorption rate under series of conditions were presented and the influences of CO 2 partial pressure and the types of AAILs on the absorption performance were demonstrated.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiangyu Ge,Jinjin Li,Chenhui Zhang,Yuhong Liu,Jianbin Luo
Several ionic liquids (ILs) are formed in situ with monovalent metal salts and ethylene glycol (EG). The macroscale superlubricity and antiwear properties of the ILs were studied between ceramic materials. Superlow coefficients of friction of less than 0.01 could be obtained for all ILs at silicon nitride (Si3N4) interfaces induced by tribochemical reactions. Notably, the IL ([Li(EG)]PF6) formed with LiPF6 and EG exhibited the greatest superlubricity and antiwear properties. The results of film thickness calculations and surface analysis showed that the lubrication regime during the superlubricity period was the mixed lubrication, and a composite tribochemical layer (composed of phosphates, fluorides, silica (SiO2), and ammonia-containing compounds), hydration layer, and fluid film contributed to superlubricity and wear protection. It was found that the small size of metal cations was beneficial for alleviating wear, and PF6– anions exhibited the smallest friction and best antiwear performance at Si3N4 interfaces. This work studied the lubricity and antiwear properties of ILs with different cations and anions, enriching the range of alternative ILs for macroscale superlubricity and low wear, and is of importance to engineering applications.
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高影响因子
Green Chemical Engineering
·
2020
·
IF 0
Zhengqing Zhang,Xuemeng Jia,Yuxiu Sun,Xiangyu Guo,Hongliang Huang,Chongli Zhong
CO 2 separation performance of polymer membranes can be significantly enhanced by selecting porous fillers with high CO 2 affinity. Ionic liquids incorporation has been recognized as an effective strategy for improving the separation ability of pristine porous fillers. However, the influence of the specific functional groups of ILs in IL@MOF composites on separation performance of MMMs still remains unclear. Herein, we designed three microenvironment-tuned IL@ZIF-8 composites in which the three ILs contain different functional groups (-CH 3, –SO 3 H, and –NH 2 ). Molecular simulation results showed that the NH 2 -IL@ZIF-8 has a commendable CO 2 adsorption capacity and CO 2 /CH 4 adsorptive selectivity, and the results were well confirmed by the following experimental data. More importantly, the prepared NH 2 -IL@ZIF-8 based MMMs also exhibit superior CO 2 separation performance among the three IL@ZIF-8 based MMMs owning to its high CO 2 affinity. Thus, this work can provide guidance for designing IL@MOF composites for MMMs fabrication towards gas separation, and the research mode combining molecular simulation prediction and experimental verification can afford valuable reference for material development in membrane separation field.
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