CARBON
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2019
·
IF 7.466
Xiangyu Ge,Jinjin Li,Hongdong Wang,Chenhui Zhang,Yuhong Liu,Jianbin Luo
The liquid-superlubricity state has rarely been studied under an average contact pressure exceeding 300 MPa at the macroscale . In this work, a robust macroscale liquid-superlubricity state (μ ≈ 0.005) under an extreme pressure of 600 MPa was reported, which was enabled by the combination of graphene-oxide (GO) nanosheets with an ionic liquid (IL) between the frictional pairs of Si 3 N 4 /sapphire. The analysis indicated that a composite boundary layer (formed by IL) at the interface contributed to the excellent antiwear performance, thereby providing a lubricating condition under extreme pressure. Notably, GO nanosheets were directly observed to adsorb on worn surfaces, thereby proving the transformation of the shear interface from Si 3 N 4 /sapphire into GO/GO nanosheets. The extreme pressure property and extremely low shear stress between the interlayers of GO nanosheets contributed to the achievement of superlubricity. Therefore, the synergistic effect between GO nanosheets and IL played a dominant role in achieving liquid-superlubricity under extreme pressure at the macroscale. This study provided a novel method to achieve liquid-superlubricity under extreme conditions—by the synergistic effect of 2D materials and liquid molecules—accelerating the achievement of liquid-superlubricity in industrial applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Congfei Yao,Yucui Hou,Ying Sun,Weize Wu,Shuhang Ren,Hui Liu
The extraction of aromatics from aliphatics with both high distribution coefficient ( D ) and high selectivity ( S ) is a challenge in the industry. Hydrophobic dicationic ionic liquids (DILs) were demonstrated as efficient extractants with both high D and high S . However, the high viscosity of the DILs may influence their application. In this work, we found that a hydrophobic DIL ([C 5 (MIM) 2 ][NTf 2 ] 2 ) could dissolve a small amount of water with a solubility of 2.24 wt% at 303.15 K. The viscosity and density of the DIL with different contents of water were investigated from 293.15 K to 333.15 K. A small amount of water in the DIL could decrease its viscosity greatly, while had little effect on its density. The effect of water content in the DIL on the extraction performance was studied, and it was found that both D and S remained high when a small amount of water dissolved in the DIL. The highest selectivity and distribution coefficient for toluene were 45.7, 0.86 (water content: 1.10 wt%) and 41.5, 0.75 (water content: 1.59 wt%), respectively. With increasing the carbon chain of aliphatics, both D tol and D ali decreased, but S increased in the presence of water. All the results indicated that the DIL with a small amount of water not only had high D and S simultaneously, but also enhanced the extraction process. Importantly, the use of water in the extraction process accords with the concept of green chemistry.
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Analytical Methods
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2019
·Vol. 12
·期 3
·324-332
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IF 2.378
Ranxi Ni,Jingdong Peng,Miaomiao Wen,Huanjun Peng,Zhongying Zhang,Shiyu Li,Xiang Wang,Jun Chen,Dengying Long,Hong Xian
A novel imidazolium ionic liquid mixed-mode stationary phase (named IBON) was successfully prepared by a controlled thiol-initiated radical polymerization method. The successful preparation of the IBON stationary phase was certified by Fourier transform infrared (FT-IR) spectrometry, elemental analysis, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Meanwhile, the zeta potential showed the surface potential of the IBON stationary phase, while the results of gel permeation chromatography (GPC) demonstrated the successful control of the surface-initiated polymerization. The retention behaviour was investigated by various types of analytes, including acidic compounds, basic compounds and neutral compounds (containing polar nucleosides and bases, non-polar benzene series). Through investigating the influence of the acetonitrile content, pH of the mobile phase, buffer concentration on the retention and by employing the van't Hoff equation and linear solvation energy relationships model, it was found that the various test solutes could undergo multiple interactions with the IBON stationary phase, including hydrophobic, electrostatic, dipole–dipole, hydrogen bonding, ion exchange and π–π interactions. The prepared stationary phase was employed to separate polar solutes, benzene series, and inorganic anions, and it displayed different separation characters when compared to the commercial Acclaim™ Mixed-mode WAX-1 column.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2019
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IF 2.983
Xinqi Zhu,Cheng Chen,Jiaquan Chen,Guangfu Xu,Yingxiang Du,Xiaofei Ma,Xiaodong Sun,Zijie Feng,Zhifeng Huang
In this study, a carboxymethylated-β-cyclodextrin-based chiral ionic liquid (CIL), tetramethylammonium-carboxymethylated-β-cyclodextrin (TMA-CM-β-CD) was successfully designed and synthesized. This cyclodextrin-based ionic liquids (ILs) was used as the sole chiral selector in capillary electrophoresis, and it is very interesting to find that the chiral separation capability can be remarkably improved when a conventional cyclodextrin chiral selector evolved into an IL chiral selector. The ionic liquid showed satisfactory separation performance towards twelve tested drugs. A series of parameters affecting the enantioseparation, such as the type and proportion of organic modifier, buffer pH, chiral selector concentration, as well as applied voltage were systematically investigated. Additionally, the molecular docking program Autodock was applied to further demonstrate the mechanism of chiral recognition and the enhanced enantioselectivity of TMA-CM-β-CD, which kept in agreement with our experimental results.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Yuhan Li,Zongjie Sun,Lei Shi,Shiyao Lu,Zehui Sun,Yuchuan Shi,Hu Wu,Yanfeng Zhang,Shujiang Ding
Solid-state polymer electrolyte with high ionic conductivity and electrochemical stability is desirable for lithium metal batteries. A poly(ionic liquid)-polyethylene oxide semi-interpenetrating polymer network composite solid electrolyte for safe lithium metal batteries is designed to satisfy the demand of ionic conductivity, safety and electrochemical stability. This composite solid electrolyte is fabricated via polymerizing 1-vinyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (ionic liquid monomer) in polyethylene oxide matrix by one-step method. Differential scanning calorimetry results reveal that the crystallinity of composite solid electrolyte reduce to 15.5% comparing with polyethylene oxide solid electrolyte owing to the confinement of poly(ionic liquid) interpenetrating network. The semi-interpenetrating polymer network structure simultaneously endow the composite solid electrolyte with high ionic conductivity (6.12 × 10 −4 S cm −1 at 55 °C) and wide electrochemical window (5.44 V vs. Li/Li + ) and thermal decomposition temperature (280 °C). In order to verify the favorable electrochemical performance of composite solid electrolyte, we assemble the cells with LiFePO 4 /Li using the electrolyte. The reversible capacity of LiFePO 4 is 147 mAh g −1 with high Coulombic efficiency (up to 99%) at the 0.2 C rate and 55 °C.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2019
·
IF 1.911
Yu Ji,Tengda Zhang,Xia Gui,HaiJian Shi,Zhi Yun
The ketalization of glycerol with acetone was conducted over an ionic liquid [P(C 4 H 9 ) 3 C 14 H 29 ][TsO] (TTPT) in a batch reactor. A scheme to obtain the purified product using TTPT as a homogeneous catalyst is proposed and a maximum solketal yield of 86% is achieved at acetone/glycerol molar ratio of 6/1, reaction time of 0.5 h, reaction temperature of 303 K, catalyst amount of 5 wt% of glycerol. TTPT was recycled and reused for ten times without obvious losses in terms of quantity and activity. Furthermore, effects of various experimental parameters (stirring speed, catalyst loadings, temperature and reactant composition) on the reaction kinetics are investigated. In terms of kinetics modeling, K γ is fitted by reactant composition at the temperature range 298 K–323 K, which was a concise strategy that showed good precision in the kinetics fitting. The activation energy for this ketalization reaction was evaluated to be 28.2 kJ·mol −1 . In addition, the kinetics of the reaction at a temperature exceeding the boiling point of acetone were also studied. We believe that all the results are important for further development of a technology for the continuous synthesis of solketal.
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RSC Advances
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2019
·Vol. 9
·期 26
·14974-14981
·
IF 3.049
Zhongliang Zhao,Caihong Zhu,Qianping Guo,Yan Cai,Xuesong Zhu,Bin Li
Molecular imprinting of proteins has evolved into an efficient approach for protein recognition and separation. However, maintaining the structural stability of proteins during the preparation process of molecularly imprinted polymers (MIPs) remains challenging. Ionic liquids (ILs), being capable of maintaining the stability of proteins, might enable effective imprinting and accurate recognition of proteins. In this study, lysozyme (Lyz)-imprinted titanium dioxide (TiO2) nanoparticles, TiO2@Lyz-MIPs, have been successfully prepared for selective recognition and separation of Lyz. This was achieved by the free radical polymerization of hydroxyethyl acrylate (HEA) and poly(ethylene glycol) dimethacrylate (PEGDMA) on polydopamine (PDA)-modified TiO2 nanoparticles using an IL, choline dihydrogen phosphate (chol dhp), as the stabilizer of Lyz. It was found that both PDA modification of TiO2 and the use of chol dhp as stabilizer improved the adsorption capacity of TiO2@Lyz-MIPs toward Lyz. When the concentration of HEA was 7 mg mL−1, the ratio of monomer to crosslinker was 20 : 1, and the concentration of chol dhp was 12.5 mg mL−1, the highest imprinting factor of 4.40 was achieved. TiO2@Lyz-MIPs exhibited relatively high adsorption capacity with the maximum adsorption capacity up to 120 mg g−1, which was more than four times higher than that of the non-imprinted polymers (NIPs) counterpart, TiO2@Lyz-NIPs. The adsorption rate of Lyz by TiO2@Lyz-MIPs was also much higher than that of TiO2@Lyz-NIPs. TiO2@Lyz-MIPs could successfully separate Lyz from diluted egg white, a complex mixture of proteins. Findings from this study indicate that effective recognition cavities toward Lyz were formed on the surface of Lyz-imprinted TiO2 nanoparticles prepared using IL as the template stabilizer. This approach may facilitate the development of MIPs for efficient protein recognition and separation.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Datong Wu,Yin Yu,Jie Zhang,Lili Guo,Yong Kong
Here, a novel fluorescent chiral poly(ionic liquid) (S)-PCIL-4 with nonconjugated backbone is designed and synthesized in the control of micelle through free-radical polymerization, whose fluorescence emission maximum is at λem,max = 430 nm. It is observed that polymers with spatially proximate units (phenyl group and pyridinium cation) have photoluminescence through spatial π–π and ion−π interaction. Then, (S)-PCIL-4 can be served as a fluorescent turn off/on sensor for chiral recognition of phenylalaninol and tryptophan in the presence of Cu(II). For example, when (S)-PCIL-4–Cu(II) is treated with (R/S)-phenylalaninol, it will exhibit different fluorescence responses. Values of the enantiomeric fluorescence difference ratio for phenylalaninol and tryptophan are 1.10 and 1.08, respectively. In brief, we believe that the approach opens up a possible pathway to prepare a variety of fluorescent polymers with nonconjugated backbone and proves to be desirable in further application.
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Journal of Analytical Methods in Chemistry
·
2018
·
IF 1.262
Rui Lv,Shuya Cui,Yangmei Zou,Li Zheng
Two thermoregulated dicationic ionic liquids were synthesized and applied for effective extraction of the common dye malachite green oxalate (MG). The extraction parameters such as amount of ionic liquids, pH of water phase, extraction time, cooling time, and centrifugal time on the extraction efficiency were investigated systematically. It revealed that the dye has been successfully extracted into the ionic liquids, with high extraction efficiency higher than 98%, and recovery of 98.2%–100.8%, respectively. Furthermore, these ionic liquids can be recycled easily after elution. The reusable yields were 87.1% and 88.7%. The extraction of the dye into the thermoregulated ionic liquid provides a method of minimizing pollution of waste water potentially.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Dewei Wang,Lang Xu,Jiawang Nai,Xiaoxia Bai,Tao Sun
Controllable synthesis of nanocarbons with tunable morphologies from sustainable biomass through facile one-step route for ionic liquid based supercapacitors with high energy density and high power characteristics is of great interest but remains an ongoing challenge. Herein, we report the design and synthesis of nanocarbons with tunable morphologies (i.e., honeycomb-like porous carbons, carbon nanosheets and irregular-shaped carbon microparticles) from sustainable pine barks through reliable one-step chemical activation process. We found that the honeycomb-like porous carbons can be produced via direct KOH activation while the uniform carbon nanosheets were obtained by employing magnesium powder as the reactive self-sacrificing template. These three samples have different morphologies and textural properties render them totally disparate electrochemical performance in ionic liquid electrolyte. Benefiting from its distinct structural advantages, the as-obtained porous carbon nanosheets has excellent electrochemical capacitive performance including large specific capacitance (193 F/g at 1 A/g), superior rate capability (superior specific capacitance retention of 69.4% at 40 A/g), good cycling stability (good capacitance retention after 8000 cycles) and integrated high energy density& high power characteristics (excellent energy density of 55.8 Wh/kg even at an ultrahigh power density of 39.375 kW/kg). We believed that this work reported here not only provides a versatile strategy towards nanocarbons with tunable morphologies from sustainable biomass but also sheds some new light to efficiently regulate the morphologies of nanocarbons for electrochemical energy storage applications.
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Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 5
·2172-2183
·
IF 9.931
Qingqing Rao,Ao Li,Jiawen Zhang,Jingxian Jiang,Qinghua Zhang,Xiaoli Zhan,Fengqiu Chen
Stimuli responsive slippery surfaces with controllable wettability have attracted much attention due to their potential application in many fields. However, most of these surfaces only adopted paraffin as the lubricant oil and achieved wettability transformation just by heating. In addition, the self-repairing properties of smart slippery surfaces have rarely been reported. Hence, challenges still remain in fabricating multiple responsive slippery surfaces based on other lubricants possessing self-repairing properties. Here, a smart slippery surface with controllable wettability was fabricated by using solid/liquid fluorinated ionic liquids (FILs) as lubricants and fluoropolymer films as the underlying substrates. The FIL, a thermo-responsive phase-transition material, was synthesized by ionic exchange and the substrate exhibited good self-repairing properties and magnetic-thermal and photo-thermal responses. By tuning the substrate temperature under light irradiation or magnetic field to change the phase state of the FIL, the surface could realize wettability conversion. Besides, the responsive temperature can be adjusted by tuning the melting temperature (Tm) of the FIL. The FIL was first synthesized and there was no report employing FILs as the lubricants to realize the wettability change of slippery surfaces. This work provided a new type of lubricant to prepare intelligent slippery surfaces, thus advancing the application of slippery surfaces in liquid transport devices.
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BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Xianfeng Hou,Zhinan Wang,Jin Sun,Meng Li,Shujie Wang,Kai Chen,Zhenzhong Gao
A novel pretreatment strategy based on combination of microwave and ionic liquid [TBA][OH] was developed for enhancing enzymatic hydrolysis of Eucalyptus sawdust. The sugar yield of pretreated sample achieved 410.67 mg/g in 48 h, which suffered from optimized microwave-assisted [TBA][OH] pretreatment. The work mechanism was illuminated by chemical composition, Fourier transform infrared spectroscopy (FTIR), 13 C cross polarization/magic-angle spinning solid state NMR ( 13 C solid NMR), X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses. The combined effect of microwave and [TBA][OH] leads to the violent deconstruction of lignin, removal of hemicelluloses, destruction of crystalline region and an eroded, pored and irregular micro-morphology. As a green, relatively inexpensive and high efficient pretreatment, microwave-assisted [TBA][OH] pretreatment has great potential in the field of bio-refinery.
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危险品化学品经营许可证（带存储）