ACS Applied Polymer Materials
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2021
·
IF 4.089
Jiancheng Wang,Han Sun,Zhiyao Yang,Yudong Wang,Xiaopeng Zhao,Jianbo Yin
Electrorheological (ER) polishing is an electric field-assisted polishing technology, but its application is limited by the insufficient performance of ER polishing fluids. This insufficient performance is mainly because the present ER polishing fluids are prepared by simply mixing abrasive particles into ER fluids, and the phase separation is easy to occur under simultaneous action of the electric field and shear field due to the difference in the ER effect between ER particles and abrasive particles. To solve this problem, we here reported a kind of composite ER polishing particles composed of poly(ionic liquid) (PIL) ER active particles covalently attached with commercial Al2O3 nanoabrasives. The composite particles could be facilely prepared by the polymerization of a Pickering emulsion with vinyl ionic liquid as the oil phase and silane-modified Al2O3 nanoparticle abrasives as the solid surfactant. Under simultaneous action of the electric field and shear field, the PIL/Al2O3 composite particles well overcome the phase separation problem of abrasive and ER active particles and exhibit a significantly better ER effect and polishing property compared to the simple mixture of the Al2O3 abrasive and PIL ER particles. This paper provides a way to solve the phase separation problem of traditional ER polishing fluids by integrating the ER effect and polishing property into a particle system.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Hui Xu,Yingxiang Du,Zijie Feng,Xiaodong Sun,Jie Liu
Recently, in separation science, ionic liquids (ILs) have been commonly used as modifiers for buffer solutions, dynamic coating solutions, or coating solutions on carriers in capillary electrophoresis. However, only several papers have reported the use of chiral ILs as the sole chiral selector. In this paper, a chiral ionic liquid, cholinium-clindamycin phosphate (Ch-CP), was synthesized and employed as a sole chiral selector in capillary electrophoresis (CE). A series of parameters affecting the separation were optimized, including chiral selector concentration, buffer pH, proportion of organic modifier, as well as the applied voltage. Under the optimal conditions, compared to clindamycin phosphate (CP), the IL selector showed better enantioseparation capability and improved peak shapes for five racemic drugs. In addition, Molecular docking program Autodock was employed to elucidate the chiral recognition mechanism of Ch-CP, the computing results conformed to the experimental results.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2019
·
IF 5.04
Liting Guo,Changdong Gu,Jie Feng,Yongbin Guo,Yuan Jin,Jiangping Tu
A hydrophobic epoxy resin coating with an environmental-friendly deep eutectic solvent (DES)-based conversion pretreatment was proposed to enhance the corrosion resistance of magnesium alloys . The hydrophobic epoxy resin coatings on the AZ31B magnesium alloy with and without the DES-based conversion pretreatment were thoroughly compared. It is found that the DES-based conversion film on the AZ31B magnesium alloy is mainly composed of MgH 2 , MgO and MgCO 3 . Furthermore, the conversion film possesses porous structure, which provides more anchor points for the following epoxy resin coating. However, without the DES-conversion pretreatment, the epoxy resin is difficult to be attached on the substrate during the dip-coating process. The double layered hybrid coating system promotes the corrosion resistance of the magnesium alloys significantly, which can be ascribed to the unique architecture and component including the hydrophobicity of the surface layer, the dense and interlocked epoxy resin, and the corrosion resistant DES-based conversion pretreatment.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 39
·15700-15705
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IF 3.069
Yan Lei,Limei Yu,Maochang Shen,Shikang Luo,Zhanxian Gao
A series of ionic liquids (ILs) were synthesized and their Hammett acidities (H0) were determined using 4-nitroaniline as the indicator. The relationship among IL's structure, the acid strength, and the catalytic performance in the condensation reaction of 9-fluorenone with phenol was discussed. The effective H0 range of ionic liquids that can catalyse the condensation reaction was obtained. Moreover, the catalysis of the mercapto compound co-catalyst was also systematically studied. According to the analysis of how the structure of the sulfydryl co-catalyst affects the percent conversion of 9-fluorenone and the selectivity of BHPF, a mechanism for the reaction in the IL–thiol cooperative catalytic system was proposed. The present work gave a clear clue to design novel IL catalysts for the synthesis of BHPF.
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CELLULOSE
·
2019
·Vol. 26
·期 17
·9163-9178
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IF 3.917
Li Bo,Pan Yuanfeng,Zhang Qi,Huang Zhihong,Liu Jie,Xiao Huining
Modified porous cellulose beads (MCBs) with typical sizes ranging from 2 to 3 mm were successfully fabricated via acidic precipitation from the cellulose dissolved in ionic liquid, followed by surface-grafting with aminoguanidine hydrochloride using glutaric anhydride as a coupling agent. The nano-sized calcium carbonate (30% wt on dry cellulose) was added to cellulose solution prior to the precipitation in acidic medium in an attempt to promote the formation of the pore structure of cellulose beads. Modified cellulose powders (MCPs) (size 150 μm) were prepared by precipitating the solution of the cellulose which reacted with glutaric anhydride homogeneously in ionic liquid, followed by grafting with aminoguanidine hydrochloride. The pseudo-second-order kinetic model and the Langmuir isotherm model described the adsorption process well. The maximum adsorption capacities of MCBs towards Hg(II) and Cu(II) were 581.4 and 94.88 mg/g; whereas the maximum adsorption capacities of MCPs for Hg(II) and Cu(II) were 625 and 98.52 mg/g, respectively. The results demonstrated that both MCBs and MCPs are highly effective and promising as green-based adsorbents for the removal of heavy metal ions in aqueous systems, Hg 2+ in particular.
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ACS Sustainable Chemistry & Engineering
·
2020
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IF 7.632
Xiaohui Di,Yu Zhang,Junying Fu,Qiang Yu,Zhongming Wang,Zhenhong Yuan
Dimethyl itaconate (DI), a promising biomass-derived intermediate, cannot be synthesized from itaconic acid (IA) in organisms due to the lack of metabolic pathways. It is necessary to develop a green and high-efficiency method to synthesis DI from IA. In this study, DI was, for the first time, produced from IA in an aqueous medium by an ionic liquid-strengthened enzymatic method. We found that when pretreated by the ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), the pH tolerance range of the lipase shrunk and the hydrolysis activity of it was greatly inhibited, while its esterification activity was not. Moreover, when the [bmim][PF6]-treated immobilized Rhizomucor miehei lipase (RML, 50 mg/mL) was employed in a reaction containing IA/methanol at a molar ratio of 1:30 and methanol/water in a volume ratio of 1:10 at 30 °C after 24 h, a 64.3% yield and 73.2% selectivity of DI was obtained. The results of HPLC and GC–MS revealed that in addition to the main product DI, other side products including acetic acid, propionic acid, and itaconic acid cyclolactone were also generated, which indicates that the RML-catalyzed esterification of IA and methanol has various side reactions, such as lactonization and self-decomposition of IA.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Xiaofeng Ma,Xiaoyu Lan,Linlin Wu,Lei Wang,Qun Gu,Yijun Shi,Xiaoli Gu,Zhenyang Luo
A series of well-defined random copolymers comprising butyl acrylate (BA) and 4-phenylazophenylmethacrylate (AzoMA) (P(AzoMA- r -BA)) are prepared successfully by reversible addition fragmentation chain transfer (RAFT) polymerization. P(AzoMA- r -BA)s show LCST-type phase transition in 1-butyl-3-methylimidazolium bis(trifluoromethanesulfone)amide ([C 4 mim][NTf 2 ]). LCST depends on the photoisomerization state of azobenzene, as well as on the AzoMA composition in the random copolymers. LCST of (P( cis -AzoMA- r -BA) is significantly higher than that of P( trans -AzoMA- r -BA), because cis -AzoMA and trans -AzoMA behave as solvato-philic and solvato-phobic comonomer, respectively. At a bistable temperature, photo-induced phase separation is completely reversible. Secondly, based on this phenomenon, a thermo-/photo- responsive ion gel (BA-AzoMA ion gel) can be prepared by free radical polymerization of BA and AzoMA using ethylene glycol dimethacrylate (EGDMA) as crosslinker in [C 4 mim][NTf 2 ]. BA-AzoMA ion gel shows high temperature contraction and low temperature expansion behavior, due to LCST-type phase behavior of polymer system consisting of AzoMA and BA. Contraction temperature of BA-AzoMA ion gel depends on photoisomerization state of the azobenzene group in polymers. At a bistable temperature, photo-induced expansion-contraction is reversible. Finally, a Photo-induced actuator can be realized using BA-AzoMA ion gel at suitable temperatures, featuring reversible bending by alternate irradiating with visible and UV light. The bending behavior is also demonstrated.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jingjiao Cao,Wanjian Shan,Qian Wang,Xingchen Ling,Guoqing Li,Yinong Lyu,Yu Zhou,Jun Wang
Porous poly(ionic liquid)s (PPILs) combine the features of porous materials, polymers, and ionic liquids (ILs) or their derivatives, but they are normally of amorphous structure with disordered pores. Here, we report the facile synthesis of ordered porous poly(ionic liquid) crystallines (OPICs, specialized as a kind of PPIL analogues) with diverse and adjustable framework IL moieties through the Schiff base condensation of IL-derived ionic salts and neutral monomers. Ternary monomer mixtures are employed to artistically control the chemical composition and pore configurations. Compact atomic packing was achieved to give spacing confined ionic surface with strong CO2 affinity. Through monomer control, OPICs exhibit high CO2 uptakes with excellent CO2/N2(CH4) selectivities and efficiently implement CO2 fixation through catalyzing epoxides cycloaddition under down to ambient conditions.
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PubMed
高影响因子
FUEL
·
2019
·
IF 5.128
Shuang Yue,Pingping Wang,Xueying Hao
The bifunctional imidazolium ionic liquids ([HEMim][Glu], [HEMim][Asp], [HEBim][Asp], [HEBim][Ala], [HEBim][His]) were successfully synthesized and characterized by 1 H NMR, 13 C NMR, COSY, HSQC and FT-IR spectroscopy. The ionic liquids performed as bifunctional catalysts and exhibited high catalytic activity for the cyclic carbonate synthesis from CO 2 and epoxides under mild conditions with excellent yields in the absence of any solvents or co-catalysts. The reaction time, reaction temperature, CO 2 pressure and the amount of ionic liquid were systematically investigated. The catalyst can be reused for at least four cycles without any significant drop in the catalyst activity and hence represents a reasonably environmentally benign chemical process for CO 2 fixation.
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高影响因子
IONICS
·
2019
·Vol. 25
·期 9
·4351-4360
·
IF 2.289
Yu Zhongliang,Zhang Jiahe,Xing Chunxian,Hu Lei,Wang Lili,Ding Ming,Zhang Haitao
Boron-nitrogen co-doped graphene nanoarchitectures were synthesized by annealing a freeze-dried precursor containing exfoliated graphene oxide (GO) nanosheets, ammonium borate, and polyvinyl alcohol (PVA). The microstructures and composition of nanocomposites were optimized and characterized systemically. Effects of a doping element on the electrochemical performances and interface compatibility were evaluated. The restacking of exfoliated graphene nanosheets was hindered effectively by the ultra-fine carbon clusters formed via the thermal decomposition of PVA. Such a three-dimensional structure favors the fast mobility of electrolyte ions. In addition, the co-doping of N and B elements not only increases interface compatibility between ionic liquid electrolyte and graphene but also supplies extra pseudocapacitance. Benefiting from the integrated merits, the optimized nanocomposites could deliver a specific capacitance of 35.4 F g −1 at 1 A g −1 and present a maximum energy density of 78.7 Wh kg −1 with a power density of 2043 W kg −1 . Due to the formation of more decoupled ions in ionic liquid electrolyte at elevated temperature, the symmetric supercapacitors based on the as-formed nanocomposite exhibit a maximum energy density of 134.6 Wh kg −1 at 60 °C.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Guifen Zhu,Guohao Cheng,Tong Lu,Zhiguo Cao,Lifang Wang,Qianjin Li,Jing Fan
An ionic liquid functionalized polymer (IL-P) was prepared feasibly and simply by grafting1-butyl-3-vinylimidazolium bromide onto the silica surface. The IL-P was fully characterized, and the results showed that IL-P has a rough surface with a lower specific surface area (205.49 m 2 g −1 ), and the involvement of ionic liquid significantly improved the adsorption performance of IL-P. The pH, initial concentration, adsorption time and temperature were investigated to discuss the adsorption behaviors of IL-P in aqueous solution. The adsorption process of 2,4-dichlorophenol (2,4-DCP), bisphenol A (BPA) and 2,4-dinitrophenol (2,4-DNP) onto IL-P better fitted the pseudo-second-order model, while that of 2-isonaphthol (2-NP) followed the pseudo-first-order model. The adsorption behaviors of IL-P towards 2,4-DCP and 2,4-DNP fitted well with Liu isotherm model, and that of BPA and 2-NP can be described by Langmuir model. The maximum adsorption capacities of 2,4-DCP, BPA, 2,4-DNP and 2-NP bound on IL-P was 239.7, 68.39, 56.86 and 64.28 mg g -1 , respectively, and the adsorption of IL-P is a spontaneous physical process. Comparing with other adsorbent, the as-prepared IL-P showed excellent recognition ability towards the phenolic compounds and can be applied to adsorb and remove trace 2,4-DCP, 2-NP, 2,4-DNP and BPA simultaneously in complicated wastewater and soil samples.
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PubMed
高影响因子
FOOD CONTROL
·
2019
·
IF 4.248
Na Li,Xiaoying Liu,Jihe Zhu,Bijing Zhou,Junxian Jing,Aibing Wang,Rui Xu,Zhou Wen,Xingbo Shi,Shiyin Guo
A simple and sensitive electrochemical biosensor for acrylamide (AA) detection based on hemoglobin (Hb) entrapped in ionic liquid-carbon paste was constructed. The Hb-carbon ionic liquid paste electrode (Hb/CILPE) was studied and characterized by scanning electron microscopy (SEM) and electrochemical method. The surface passivation of the Hb/CILPE could be achieved by the addition of acrylamide molecule, which caused the lower current response value owing to the adduct formed by acrylamide and Hb as a result of the reaction between the α-NH2 group and the N-terminal valine of Hb. The experimental conditions such as pH value of supporting electrolyte, pulse increment and concentrated time of AA was examined. Under the optimum conditions, the differential pulse voltammetry (DPV) responses of Hb/CILPE toward AA was evaluated in a good linear range from 1.0 × 10 −11 to 1.0 × 10 −5 M, with a detection limit of 5.0 × 10 −12 M at S/N = 3. This biosensor can be successfully applied to the determination of AA in a real sample without complex pretreatment. Compared with other electrochemical methods for detecting AA, the prepared electrochemical biosensor exhibited advantages of simple preparation, easy surface renewal, better reproducibility and satisfactory stability.
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