INDUSTRIAL LUBRICATION AND TRIBOLOGY
·
2023
·Vol. 75
·期 10
·1161-1169
·
IF 1.6
Huimin Yang,Chunlin Ye,Yi Li,Songwei Zhang
Purpose This study aims to probe the applicability of 2-mercaptobenzothiazole (MBT) functionalized ionic liquids (ILs) as additives in lithium complex grease (LCG) by researching the corrosion inhibiting, rheological and tribological performances. Design/methodology/approach Electrochemical tests such as electrochemical impedance spectroscopy and potentiodynamic polarization curves were used on Gamry electrochemical workstation to research the corrosion inhibition properties of ILs in 1.0 M HCl corrosive solution. The rheological properties of different grease samples were tested on a rheometer. The tribological properties were investigated on SRV-V oscillating reciprocating friction and wear tester. Scanning electron microscope, X-ray spectrometer and X-ray photoelectron spectrometer were used to characterize the lubricating mechanism. Findings The 2-MBT functionalized ILs have excellent corrosion inhibition properties. When used as additives in LCG, they both exhibited enhancing effects on thermostability, colloid stability and structural recoverability, and furthermore, outstanding friction-reducing and antiwear properties were also obtained. Surface analysis indicated that the superior lubricating performances of 2-MBT functionalized ILs were mainly ascribed to the formation of tribochemical products on wear tracks, including organic compounds with C–O bond, Fe 2 O 3 and FeS 2 . Originality/value The 2-MBT-based ILs synthesized in this study were multifunctional additives with excellent corrosion inhibiting and tribological properties, which would have a very broad application prospect in lubricating grease industry.
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高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 6
·1625-1634
·
IF 2.936
Guang Binxiong,Zhang Wei,Wu Yuefeng,Xiao Yahui,Su Miaojun,Liu Yong
Dual sulfonic acid functionalized heteropolyacid-based ionic liquids were synthesized, characterized and used as novel solid acid catalysts for selective esterification of glycerol with acetic acid toward fuel-additive triacetylglycerol (TAG). The results indicated that the as-prepared [BS 2 TMEDA]HPW 12 O 40 catalyst had the highest catalytic activity and selectivity to TAG compared with commercial H 3 PW 12 O 40 , H 2 SO 4 and Amberlyst-15 catalysts, which was attribute to its medium acidity of dual-SO 3 H groups and carbon chain length. The effects of reaction temperature, catalyst amount, acetic acid to glycerol mole ratio and reaction time on glycerol conversion and selectivity to TAG were also investigated. Under the optimized reaction condition, the glycerol conversion and selectivity to TAG reach 100% and 70.9%, respectively. Moreover, no significant loss in glycerol conversion and selectivity to TAG were observed after reused four recycles, showing favorable catalytic reusability and stability. Graphical Abstract
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Jiaming Zhu,Feihu Li,Xiwei Hu,Qunsheng Li,Hongkang Zhao
This study investigates the phase equilibrium behavior of the isopropyl acetate (IAC)-isopropanol (IPA) azeotrope system at 101.3 kPa in the presence of three different imidazolium-based ionic liquids (ILs) as entrainers, 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][NTf2]), and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][NTf2]). First, according to the measured vapor–liquid equilibrium (VLE) data of the binary system IAC(1)-IPA(2) and the ternary system IAC(1)-IPA(2)-ILs(3), [BMIM][Ac] in the ternary system produces a strong salting-in effect on IPA, while [BMIM][NTf2] and [HMIM][NTf2] produces a salting-in effect on IAC, and the effect of [BMIM][Ac] is much stronger than [BMIM][NTf2] and [HMIM][NTf2]. This work uses the nonrandom (local) two-liquid equation to correlate the VLE data. The mole fractions of [BMIM][Ac], [BMIM][NTf2], and [HMIM][NTf2] required to exactly eliminate the azeotropic point of the IAC-IPA system are 0.035, 0.144, and 0.206, respectively.
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NANO
·
2024
·
IF 1
Kai Su,Peng Chen,Hao Gao,Yuan Zhai,Youbei Qiao,Chaoli Wang,Feng Yang
Tumor microenvironment severely restricts the delivery of chemotherapy drugs. The microenvironment responsive nanoparticles often have complex designs with hampered clinical translatability. Here, we show a kind of ionic liquids (ILs) with soybean lecithin (SL) as cation, folic acid (FA) as anion, in particular, it could formulate nanoliposome by film evaporation method to deliver cis-Diamineplatinum (II) dichloride (cisplatin, Cis) and doxorubicin hydrochloride (DOX). These special ILs liposome could target tumor cells via folate receptor-mediated endocytosis by enhancing the cellular uptake, and significantly improve the deep permeability by actively infiltrating throughout the tumor tissue owing to the special noncovalent bond between SL–FA ILs with cell membrane. Moreover, ILs liposomes improve delivery efficiency of Cis and DOX and enhance the combined chemotherapeutic effect. The simple preparation process of the ILs nanoliposome should facilitate the clinical transformation of nanodrugs.
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高影响因子
TALANTA
·
2019
·
IF 4.916
Lijun Song,Haijuan Zhang,Jia Chen,Zhan Li,Ming Guan,Hongdeng Qiu
In this study, imidazolium ionic liquids-derived carbon dots (ImCDs) were successfully synthesized and bonded on the surface of spherical porous silica as a new stationary phase (Sil-ImCDs) for hydrophilic interaction chromatography (HILIC). First, the ImCDs were synthesized by the reaction of amino ionic liquids with citric acid , and then they were grafted onto the surface of aminopropyl-modified silica. A series of characterizations including infrared spectra, elemental analysis and laser confocal microscope proved that the preparation was successful. It was found that the Sil-ImCDs had good separation efficiency in the separation of bases, nucleosides , amino acids , saccharides and ginsenosides . It is interesting that we found that Sil-ImCDs has better hydrophilic chromatographic performance compared with methylimidazole-modified silica and aminopropyl-modified silica. It may be due to the rich functional group which is available after the formation of carbon dots from imidazolium ionic liquids and citric acid.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Hongbo Suo,Lili Xu,Yu Xue,Xiang Qiu,He Huang,Yi Hu
In this work, ionic liquids-modified magnetic carboxymethyl cellulose nanoparticles (IL-MCMC) were prepared and used as supports for enzyme immobilization. The specific activity of immobilized lipase PPL-IL-MCMC was 1.43 and 2.81 folds higher than that of free PPL and PPL-MCMC, respectively. Water contact angle analysis indicated that the introduction of ionic liquids increased the hydrophobicity of supports, which in tune induced the lid-opening of lipase, allowing its active sites to become more accessible. In addition, the affinity between lipase and substrate immobilized on the prepared supports was enhanced. The same method was also applied to analyze immobilize penicillin G acylase (PGA) to further investigate the general applicability of the method. The results showed that the immobilized PGA exhibited higher stability than many other reported PGAs. The developed composites may be utilized as excellent supports for enzyme immobilization in industrial application.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2017
·
IF 2.813
Wei Sun,Fei Xu,Weiguo Cheng,Jian Sun,Guoqing Ning,Suojiang Zhang
A series of quaternary ammonium ionic liquids (ILs) were synthesized and employed as catalysts for the production of poly(isosorbide carbonate) (PIC) from diphenyl carbonate and isosorbide via a melt polycondensation process. The relationship between the anions of the ILs and the catalytic activities was investigated, and the readily-prepared IL tetraethylammonium imidazolate (TEAI) was found to exhibit the highest catalytic activity. After optimizing the reaction conditions, a PIC with a weight-average molecular weight ( M w ) of 25600 g/mol was obtained, in conjunction with an isosorbide conversion of 92%. As a means of modifying the molecular flexibility and thermal properties of the PIC, poly(aliphatic diol-co-isosorbide carbonate)s (PAIC)s were successfully synthesized, again using TEAI, and polymers with M w values ranging from 29000 to 112000 g/mol were obtained. 13 C NMR analyses determined that the PAIC specimens had random microstructures, while differential scanning calorimetry demonstrated that each of the PAICs were amorphous and had glass transition temperatures ranging from 50 to 115 °C. Thermogravimetric analyses found T d-5% values ranging from 316 to 332 °C for these polymers. Based on these data, it is evident that the incorporation of linear or cyclohexane-based diol repeating units changed the thermal properties of the PIC.
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高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Zhenning Lou,Mengnan Huang,Junshuo Cui,Shuyao Wu,Shanshan Xing,Peng Zhou,Weijun Shan,Ying Xiong
Technetium ( 99 Tc), a radionuclide generated from uranium fission in nuclear reactors, has posed a major threat to humans due to its long half-life and radioactivity. Therefore, it is urgent to develop a strategy of selectively and efficiently capturing of 99 Tc. In this work, a series of solid copolymers (denoted as DVB-[C x ClVim][Cl]) were synthesized for efficient adsorption of perrhenate (ReO 4 − , a surrogate for TcO 4 − ) from mixed ions solution. The adsorbents with vinylimidazolium-based ionic liquid as functional group and divinylbenzene (DVB) as the basic framework exhibited stable structure and good ReO 4 − adsorption performance. The influences of the linear n-alkyl chain length on the morphology and adsorption property of the copolymers were discussed in detail. The maximum uptake of Re(VII) on DVB-[C 4 ClVim][Cl] was 517.61 mg·g −1 . Rhenium could be separated from molybdenum in the presence of co-anions and co-cations by DVB-[C 6 ClVim][Cl], which demonstrated its good adsorption selectivity . The kinetic studies showed that pseudo-second-order model was more suitable for describing the behavior of Re(VII) adsorption. The adsorption mechanism was ion-exchange between Cl − and ReO 4 − confirmed by FI-IR, IC and XPS analysis. Additionally, DVB-[C x ClVim][Cl] remained effective Re(VII) capture ability after eight adsorption/elution cycles, demonstrating their good reusability.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2020
·
IF 2.463
Mengyi Qin,Fei Zhong,Yu Sun,Xiaoyan Tan,Kehui Hu,Huiwen Zhang,Mengke Kong,Guowei Wang,Linghua Zhuang
Two anionic surface active ionic liquids (SAILs), 3-methyl-1-ethoxycarbonylimidazolium decanesulfonate ([Etmim][C 10 H 21 SO 3 ]) and 3-methyl-1-ethoxycarbonylimidazolium dodecanesulfonate ([Etmim][C 12 H 25 SO 3 ]) were synthesized and studied. The surface properties, aggregation properties and thermodynamic parameters of [Etmim][C 10 H 21 SO 3 ] and [Etmim][C 12 H 25 SO 3 ] aqueous solutions were determined using surface tension and electrical conductivity . Micelle formation of [Etmim][C 10 H 21 SO 3 ] and [Etmim][C 12 H 25 SO 3 ] was spontaneous and entropy-driven. Density functional theory (DFT) calculation was used to optimize the configuration of the anions (C 10 H 21 SO 3 , and C 12 H 25 SO 3 ), imidazolium cation ([Etmim] + ), and SAILs ([Etmim][C 10 H 21 SO 3 ] or [Etmim][C 12 H 25 SO 3 ]) with different number of water molecules (1–3) using Gaussian 16 at B3LYP/6-31G(d,p) level. Typical hydrogen bonds , bond length changes, bond angle changes, and charge changes of typical atoms in hydrated complexes were analyzed. For imidazolium cation hydrates, H 2 O formed two types of hydrogen bonds with cation ([Etmim]+). For sulfonate anion hydrates, H 2 O formed two types of hydrogen bonds with anions ([C 10 H 21 SO 3 ]- or [C 12 H 25 SO 3 ]-). Hydrogen atoms in H 2 O formed hydrogen bonds with oxygen atoms of polar sulfonate anions in three ways: 1:1, 2:1, and 2:1. The typical electron withdrawing atoms (N and O) in imidazolium cation was beneficial for the micelles formation. The electrostatic repulsion and electrostatic attractive interaction between polar groups of SAILs affected the CMC values of [Etmim][C 10 H 21 SO 3 ] or [Etmim][C 12 H 25 SO 3 ] aqueous solutions. Binding energy (D 0 ), difference of binding energy (ΔD 0 ) of sulfonate ion hydrates and SAIL hydrates confirmed the tendency of [Etmim][C 12 H 25 SO 3 ] micelle formation was higher than that of [Etmim][C 10 H 21 SO 3 ].
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Imran Khan Swati,Qazi Sohaib,Hayat Khan,Mohammad Younas,Afshin Hosseini Monjezi,Jianxin Li,Mashallah Rezakazemi
Post-combustion carbon-capturing (PCC) is one of the technologies that has been expanded in recent years, to control greenhouse gas emissions. This work aims to explore the potential applications of polymeric hydrophobic membranes and green ionic liquids (ILs). Experiments were conducted on lab-scale flat sheet (FS) membrane contactors (MCs) where CO 2 was captured from a continuous feed mixture (CO 2 + N 2 ) with a recirculated-based aqueous solution of IL at a constant temperature of 298 K and with no pressure driving force. The effects of contact angle, liquid entry pressure (LEP), initial CO 2 concentration, and type of solvents and membrane material on the CO 2 capture efficiency and membrane wetting in the PCC process have been experimentally investigated and evaluated. Polytetrafluoroethylene (PTFE) has shown the most hydrophobic property with 6–17 O loss in the contact angle. Furthermore, 1-Methyl-3-octyl-imidazolium-tetrafluoroborate ([OMIM][BF 4 ]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF 6 ]) have exhibited only 5–8 % loss in LEP using PTFE membrane support. The CO 2 capture efficiency has been achieved as 80.8–99.8 % in different combinations of ILs and membrane support keeping all other variables constant. While increasing CO 2 concentration from 15 to 45 % vol., an increase of nearly three folds in the CO 2 mass transfer flux was observed. Combination of [OMIM][BF 4 ] and PTFE membrane witnessed good long-term stability with only 20 % loss in CO 2 capture efficiency in 480 min of continuous operation.
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ACS Catalysis
·
2013
·
IF 5.265
Ru Jia,Yi Hu,Luo Liu,Ling Jiang,Bin Zou,He Huang
Various functional ionic liquids (ILs) composed of different cations and anions were activated with carbonyldiimidazole and then covalently linked onto porcine pancreatic lipase (PPL) through lysine coupling. Catalytic performances, such as activity, thermostability, and enantioselectivity were improved successfully, as was investigated in p-nitrophenyl palmitate (pNPP) hydrolysis and racemic 1-phenethyl acetate hydrolysis reaction. The correlation between catalytic performance and modification of IL was studied by catalytic and spectroscopic data, which showed improvement of catalytic performances to a different extent. Hydrolytic activity was enhanced by ILs with chaotropic cations and kosmotropic anions (e.g., more than 4-fold with [choline][H2PO4]). Modifications by ILs bearing kosmotropic cations and chaotropic anions contribute to lipase thermostability and enantioselectivity (e.g., modification with [HOOCBMIm][Cl] showed a 12-fold thermostability increase at 60 °C and more than 7-fold enantioselectivity enhancement than native enzyme). The Matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry experiments suggest that ILs bind with lipase protein. Conformation changes were confirmed by fluorescence spectroscopy, and circular dichroism spectroscopy.
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Polymer Chemistry
·
2025
·
IF 3.9
Chunman Li,Mingzhe Zhao,Zenian Gou,Tengda Zhao,Huimin Han,Kongying Zhu,Xiaoyan Yuan,Li-Xia Ren
Magnetic polymers show great potential in biomedical, electronic devices and magnetic responsive materials. The structure and property relationship are very important in design of organic magnetic polymers. In this work, core-shell magnetic bottlebrush polymers (PS-b-QPDMA[FeCl4]) with polystyrene as core block and magnetic poly(ionic liquid)s (QPDMA[FeCl4]) as shell block is prepared by ring-opening metathesis polymerization and post-modification. The self-assembly of core-shell PS-b-QPDMA[FeCl4] is studied in core and shell selecting solvent, respectively. It self-assembles into single macromolecular core-shell nanorod in shell selecting solvent while it self-assembles into core-shell nanoparticles in core selecting solvent. The magnetic property of PS-b-QPDMA[FeCl4] are studied in different morphologies via magnetic field and temperature dependent magnetization, respectively. Compared with the paramagnetic linear block copolymer, the bottlebrush polymer without self-assembly shows ferromagnetic interaction at low temperature with the bifurcation temperature (Tb) of the zero field cooling and field cooling curves of 3.2 K. The nanoparticle self-assemblies show the similar Tb at 3.8 K, while the single macromolecular nanorod self-assemblies show a high Tb of 9.8 K, demonstrating the much stronger ferromagnetic interaction for the nanorod self-assemblies. The increasing of Tb is probably due to the confinement of glassy PS core in the nanorod self-assemblies, which decreases the Fe(III)-Fe(III) distance to enhanced the ferromagnetic interaction of FeCl4- units.
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