MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-10
·
IF 5.479
Sun Yuanling,Dai Yuxue,Zhu Xiaodong,Han Rui,Wang Xueying,Luo Chuannan
A nanocomposite was prepared from a bifunctionalized ionic liquid, chitosan on magnetic nanoparticle-modified graphene oxide (IL/Chit@MGO). It was used in a chemiluminescencc (CL) assay for tetracycline. The materials were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray powder diffraction, nitrogen adsorption-desorption isotherm, vibrating sample magnetometry and zeta potentials. Subsequently, a tetracycline-binding aptamer (TC-Apt) acting as a recognition element, and G-quadruplex DNAzyme (G-DNAzyme) acting as a signal amplification component were modified on IL/Chit@MGO. So, the bifunctional G-DNAzyme/TC-Apt/IL/Chit@MGO was prepared. The IL/Chit@MGO is found to possess excellent loading capability for TC-Apt. This is attributed to the large specific surface and abundant charge on the surface of IL/Chit@MGO. The composite was used to construct a CL assay for tetracycline. Tetracycline binds to TC-Apt and causes the release of the G-DNAzyme. The latter catalyzes the CL of luminol-H 2 O 2 CL system at pH 7.4. Under optimized conditions, the blue CL at the emission wavelength of 425 nm increases linearly in the 0.16 pM to 2.0 nM concentration range, and the detection limit is 21 fM (at 3σ). The assay is selective, reproducible and stable. The assay was applied to tetracycline detection in practical samples. The apparent recoveries are 98.0% to 101.3% for the milk sample and 97.0% to 102.2% for the water sample.
G-quadruplex DNAzyme (G-DNAzyme) and tetracycline aptamer (TC-Apt) bifunctionalized ionic liquid/chitosan@magnetic graphene oxide (IL/Chit@MGO) was prepared. The nanocomposite was used to construct a chemiluminescence (CL) assay for tetracycline.
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高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Kexin Hou,Meili Bao,Lu Wang,Hua Zhang,Lei Yang,Haitian Zhao,Zhenyu Wang
In this study, in order to simultaneously extract procyanidins and essential oil from pinecones of Pinus koraiensis , aqueous enzymatic pretreatment ionic liquid–lithium salt based microwave–assisted extraction (AEILLME) with a modified hydrodistillation concatenated Soxhlet extraction apparatus was proposed. 1-Butyl-3-methylimidazolium bromide solution was selected as extraction solvent , while LiCl and mixture of cellulase and pectinase (1:1, w/w) as additives by single factor experiment. Other parameters that affect the yield of target components were investigated and optimized by Plackett–Burman design and Box–Behnken design. The obtained optimal conditions were: microwave irradiation power 581.49 W, microwave irradiation time 15.95 min and liquid–solid ratio 11.91 mL/g. Under the optimized conditions, the predicted yields of oligomeric procyanidins, polymeric procyanidins and essential oil were 13.02, 32.19 and 7.76 mg/g, respectively. Analysis of chemical constituents in the essential oil was performed on gas chromatography–mass spectrometry and there was no significant difference on the components of essential oil obtained by proposed method and traditional methods. Ionic liquids were successfully recycled and reused, which could lower the process cost and being beneficial to industrial production. This study provides an approach with good prospects for the application in extracting active components from natural plant material.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 14
·10135-10146
·
IF 2.993
Xiao Fei,Wu Kun,Luo Fubin,Yao Sa,Lv Maoping,Zou Haimei,Lu Mangeng
A new multifunctional ionic liquid-based metal–organic hybrid (PMAIL) was synthesized by anion exchange between as-synthesized phosphonate-based ionic liquid and phosphomolybdic acid and applied to epoxy resin (EP) as an efficient flame retardant. As expected, with only 1 wt% addition of PMAIL, the char yield of EP-PMAIL1 composite at 700 °C was significantly improved by 108.3% from 12.0% for neat epoxy resin to 25.0%, demonstrating the outstanding catalytic charring effect of PMAIL. Meanwhile, EP-PMAIL6 composite (6 wt% addition) can reach V-0 rating in the UL-94 vertical burning tests easily, and its peak heat release rate and total smoke production of EP-PMAIL6 were dropped by 31.0 and 15.4%, respectively, compared with neat EP. Moreover, the results from cone calorimetry tests showed that the char yield of EP-PMAIL6 was enhanced by 162% from 9.5 to 24.9% compared with neat EP, resulting in a strong intumescent char layer structure with outstanding fire retardance and mechanical properties. The thermo-oxidative stable protective layer retarded the transfer of heat and flammable volatiles during combustion and protected the epoxy matrix from further degradation. In conclusion, our results might provide a new perspective for producing composites with excellent flame retardancy and smoke suppression properties using ionic liquid-based metal–organic hybrid.
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FOOD CHEMISTRY
·
2018
·
IF 4.946
Hua Zhang,Xingqiang Wu,Yanan Yuan,Dandan Han,Fengxia Qiao,Hongyuan Yan
A new ionic liquid functionalized graphene-pipette-tip solid-phase extraction method coupled with high-performance liquid chromatography was established for the simultaneous extraction and determination of three auxins in soybean sprouts. The graphene adsorbent, with multiple adsorption mechanisms, was first synthesized by functional modification of pentafluorobenzyl imidazolium bromide ionic liquid through thiol-ene click chemistry. The ionic liquid was applied to prevent the aggregation of graphene; it also imbued graphene with the ability for π-π interactions, ionic exchange, electrostatic interactions, as well as hydrogen bonding (which is stronger than the interaction between water and analytes), by augmenting the adsorption mechanisms between the adsorbent and analytes. Under optimized conditions, linearity was achieved in the ranges 0.03–5.00 µg/g for indole-3-acetic acid and 1-naphthaleneacetic acid and 0.09–5.00 µg/g for 2,4-dichlorophenoxyacetic acid, with a detection limit of 0.004–0.026 µg/g; this adsorbent has been successfully applied for the determination of auxins in soybean sprouts.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 11
·1-10
·
IF 2.127
Wei Qiuxi,Wu Kangbing,Wang Zhengguo,Ye Xiaoxue,Li Chunya,Wang Yanying,Gan Tian
1-Vinyl-3-butyl-imidazolium hexafluorophosphate (VBimPF 6 ) was used as a functional monomer to fabricate an imprinted film onto a glassy carbon electrode modified with gold nanoparticle under the conditions applying 4,4′-dibromobiphenyl (DiBB) as a template, ethylene glycol dimethacrylate (EGDMA) as a cross-linker, and ammonium persulfate and N,N,N′,N′ -tetramethylethylenediamine as initiators at room temperature. After the fabrication process, the embedded DiBB template was removed to obtain a new electrochemical sensor with high specific recognition sites toward DiBB. The morphology of the electrode surface was characterized with scanning electron microscope and atomic force microscope. Electrochemical impedance spectroscopy was used to test the sensing performances of this newly developed electrode. The imprinted film exhibited high selectivity and sensitivity in the determination of DiBB. Under optimized conditions, the charge transfer resistance attributed to the interaction of DiBB with the electrode was found linearly related to the logarithm of DiBB concentration in the range from 0.005 to 10.0 μM. The estimated detection limit is 0.001 μM (S/ N = 3). Therefore, this electrode shows great application potential for the determination of trace DiBB contents in soil samples.
4,4′-Dibromobiphenyl imprinted polymerized ionic liquid integrated with gold nanoparticle-modified glassy carbon electrode was fabricated. Electrochemical impedance response was used for sensing performance investigation.
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JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Yujuan Chen,Zhaoen Liu,Li Sun,Zhiwei Lu,Kelei Zhuo
Nitrogen and sulfur co-doped graphene aerogel (NS-GA) is prepared by one-pot process. The as-prepared materials are investigated as supercapacitors electrodes in an ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate, EMIMBF 4 ) electrolyte. The NS-GA is characterized using X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy scanning electron microscopy. The results show that the NS-GA has hierarchical porous structure . Electrochemical performance is investigated by cycle voltammetry and galvanostatic charge-discharge. Notably, the supercapacitor based on the NS-GA-5 possesses a maximum energy density of 100.7 Wh kg −1 at power density of 0.94 kW kg −1 . The electrode materials also offer a large specific capacitance of 203.2 F g −1 at a current density of 1 A g −1 and the capacitance retention of NS-GA-5 is 90% after 3000 cycles at a scan rate of 2 A g −1 . The NS-GA-5 with numerous advantages including low cost and remarkable electrochemical behaviors can be a promising electrode material for the application of supercapacitors.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 11
·1-10
·
IF 2.127
Duan Wanyi,Li Aoqi,Chen Yujuan,Zhuo Kelei,Liu Jianming,Wang Jianji
In this work, a facile one-pot solvothermal method is developed for fabricating hollow spherical PtCu alloy nanoparticles (with the size of 124 ± 16 nm) supported on reduced graphene oxide (PtCu/rGO), with the assistance of 1-decyl-3-methylimidazolium bromide ([C 10 MIm]Br) as the structure-directing agent and capping agent. The influence of various experimental parameters on the morphology and structure of prepared PtCu/rGO hybrids is researched. Compared with the commercial Pt/C (10 wt%) and Pt/rGO, the as-prepared PtCu/rGO hybrid exhibits a larger electrochemical active surface area, higher electrocatalytic activity, and better tolerance for methanol oxidation in acidic media. We believe that the hollow spherical PtCu alloy supported on rGO will have great potential applications for direct methanol fuel cells.
Hollow spherical PtCu alloy supported on rGO hybrid is successfully synthesized by a facile one-pot solvothermal method with the assistance of 1-decyl-3-methylimidazolium bromide. 1-Decyl-3-methylimidazolium bromide acts as both shape-controlled agent and capping agent for synthesizing PtCu/rGO. The as-prepared PtCu/rGO exhibits high electrocatalytic activity and good poisoning-resistant ability for methanol oxidation in acidic media.
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POLYMER BULLETIN
·
2018
·Vol. 76
·期 8
·3971-3987
·
IF 1.589
Chen Xiuqiong,Yan Huiqiong,Sun Wei,Shi Zaifeng,Zhang Wei,Lei Mengyuan,Zhang Pan,Lin Qiang
Since the direct electron transfer of myoglobin (Mb) is hardly realized on the bare electrode, the electrodeposition of the mixture of novel MnO 2 –C composite microsphere, sodium alginate (SA) and Mb on the surface of the carbon ionic liquid electrode (CILE) was conducted to fabricate the modified electrode, denoted as Nafion/Mb–SA–MnO 2 –C/CILE. The biological activity of Mb in the Mb–SA–MnO 2 –C composite was confirmed by FTIR and UV–Vis absorption spectra. The fabricated Nafion/Mb–SA–MnO 2 –C/CILE exhibited a fast electron transfer process with a pair of well-defined redox peaks attributed to the excellent electrochemical property of MnO 2 –C composite microsphere and good biocompatibility of SA that could provide Mb suitable microenvironment to keep its biological activity and facilitate the electron transfer. Additionally, the modified electrode also exhibited a wider linear range and a low detection limit toward the electrocatalytic reduction in trichloroacetic acid with good stability, reproducibility and accurate detection for the real samples.
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JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Zhenkun Mao,Tao Bao,Zhentao Li,Zilin Chen
A novel ionic liquid (1-allyl-methylimidazolium chloride, AlMeIm + Cl − ) polymer monolith poly(ionic liquid- co -ethylene dimethacrylate) incorporated with zeolitic imidazolate framework-8 (ZIF-8-poly(IL- co -EDMA)) was firstly synthesized as stationary phases of monolithic column for capillary electrochromatography by one-step copolymerization. Incorporation of ZIF-8 into ionic liquid polymer monolith evidently enhanced the separation selectivity for four alkylbenzenes in reversed phase capillary electrochromatography (CEC), due to the synergistic effect derived from the same imidazole ring structure of ionic liquid and organic ligands of ZIF-8. Meanwhile, electroosmotic flow (EOF) was generated by ionic liquid in a wide range of pH values from 2.0 to 12.0. The resultant monolithic columns were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR). The results indicated that the prepared monolithic columns had good permeability and mechanism stability. The resultant monolithic columns were applied for the separation of neutral compounds, anilines and phenols. The highest column efficiency was 2.07 × 10 5 plates m −1 (theoretical plates, N) for toluene. Under optimal conditions, reproducibility was obtained with relative standard deviations (RSDs) of the retention time for run-to-run, day-to-day, column-to-column and batch-to-batch were in the range of 1.58 − 3.19%, 1.92 − 3.87%, 3.84 − 4.96% and 2.63 − 4.33%, respectively. Incorporation ZIF-8 into ionic liquid polymer monolith was a promising way for the application of new materials in the fabrication of novel monolithic columns.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2012
·
IF 2.422
Yingjie Xu,Bin Chen,Wu Qian,Haoran Li
Values of the density and viscosity of the pure ionic liquid n -butylammonium nitrate (N4NO 3 ) and its binary mixtures with methanol, ethanol, 1-propanol, and 1-butanol were measured at temperature ranging from T = (293.15 to 313.15) K. The thermal expansion coefficient, molecular volume, standard entropy, and lattice energy of N4NO 3 were deduced from the experimental density results. The temperature dependence of the viscosity of N4NO 3 was fitted to the fluidity equation. Excess molar volumes V E and viscosity deviations Δ η for the binary mixtures were calculated and fitted to the Redlich–Kister equation with satisfactory results. Both excess molar volumes and viscosity deviations show negative deviations for (N4NO 3 + alcohol) mixtures. The effect of the temperature and the size of the alcohol on the excess molar volumes and viscosity deviations are discussed and analysed. Other derived properties, such as the apparent molar volume, partial molar volume, excess partial molar volume, thermal expansion coefficient, and excess thermal expansion coefficient of the above-mentioned systems were also calculated.
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ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Mingtao Li,Lu Wang,Bolun Yang,Tingting Du,Ying Zhang
The polymer electrolytes based on a novel poly((4-vinylbenzyl)trimethylammonium bis(trifluoromethanesulfonylimide)) polymeric ionic liquid (PIL) as polymer host and containing DEME-TFSI ionic liquid, LiTFSI salt and nano silica are prepared. The polymer electrolyte is chemically stable even at a higher temperature of 60 °C in contact with lithium anode. Particularly, the electrolyte exhibits high lithium ion conductivity, wide electrochemical stability window and good lithium stripping/plating performance. When the IL content reaches 60% (the weight ratio of DEME-TFSI/PIL), the PIL electrolyte presents a higher ionic conductivity, and it is 7.58 × 10 −4 S cm −1 at 60 °C. Preliminary battery tests show that Li/LiFePO 4 cells with the PIL electrolytes are capable to deliver above 130 mAh g −1 at 60 °C with very good capacity retention.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 127
·104884-104890
·
IF 3.84
Yuan Cai,Huihui Huang,Lei Wang,Xiaojun Zhang,Yuewei Yuan,Rui Li,Hui Wan,Guofeng Guan
Mesoporous γ-AlOOH and γ-Al2O3 with fibrous morphology were successfully synthesized by an ionic liquid ([OMim]Br) assisted low temperature precipitation method using aluminum nitrate and ammonia as aluminum source and precipitant, respectively. The samples were characterized by XRD, TG, FT-IR, TEM, and N2 adsorption–desorption technique. The results showed that the concentration of [OMim]Br had a significant effect on the phase, porous structure, and morphology of γ-Al2O3 due to the strong interactions between [OMim]Br and γ-AlOOH. High purity γ-AlOOH was synthesized at 0.2 M [OMim]Br and γ-Al2O3 with a specific surface area of 243.53 m2 g−1, pore volume of 0.68 cm3 g−1, and average pore size of 11.10 nm was obtained after calcination. Furthermore, the recyclability of [OMim]Br was investigated. The recovery rate of [OMim]Br could reach 95.0 wt%, and the recycled [OMim]Br still had effects on the synthesis of γ-AlOOH and γ-Al2O3.
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危险品化学品经营许可证（带存储）