JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Aili Wang,Li Chen,Fan Xu,Zongcheng Yan
Castor oil-based ionic liquid microemulsions are promising alternatives for petroleum-based biolubricant basestocks. This study presents the phase behavior of castor oil-based ionic liquid microemulsions through phase manifestation, and the areas of the single-phase domain (SME) were calculated accordingly to further illustrate the phase-forming capacities of the designed microemulsions. The results indicated that the phase-forming capacities of castor oil-based ionic liquid microemulsions depended largely on the ionic liquid ions, surfactant types, and cosurfactant chain lengths. The SME of different anion-based ionic liquid microemulsions showed the following sequences: [BMIM][Tf2N]-based > [BMIM][PF6]-based > [BMIM][BF4]-based. The longer carbon chain of ionic liquid cations in single surfactant-based systems and the larger percentage of ionic liquid-based surfactant in mixed surfactants-based systems both gave rise to the phase-forming capacities of castor oil-based ionic liquid microemulsions. Given the presence of ionic liquid–castor oil amphiphilic balance in the designed systems, the castor oil–surfactant micelles achieved maximum solubilization capacity for [BMIM][BF4] when the ethoxylated groups’ number of surfactant was about eight in single surfactant microemulsion. In addition, n-hexanol donated a higher phase-forming capacity than n-butanol, while n-octanol brought about a different phase behavior due to the spontaneous curvature effect and oil nature of long-chain alcohols (C ≥ 7) in the castor-oil based ionic liquid microemulsions. Thus, this study presented useful information for formulating optimum castor oil-based ionic liquid microemulsion biolubricants based on different ionic liquids, surfactants, and cosurfactants, which were not evaluated in previous research.
✓ 已验证
DOI
高影响因子
MOLECULES
·
2015
·Vol. 20
·期 9
·17378-17392
·
IF 2.416
Jing Zhang,Jingjiang Liu,Yong Zuo,Rongmin Wang,Yubing Xiong
In this study, thermo-responsive polymeric nanogels were facilely prepared via one-step cross-linking copolymerization of ethylene glycol dimethacrylate/divinylbenzene and ionic liquid (IL)-based monomers, 1,n-dialkyl-3,3′-bis-1-vinyl imidazolium bromides ([CnVIm]Br;n= 6, 8, 12) in selective solvents. The results revealed that stable and blue opalescent biimidazolium (BIm)-based nanogel solutions could be obtained without any precipitation when the copolymerizations were conducted in methanol. Most importantly, these novel nanogels were thermo-response, and could reversibly transform to precipitation in methanol with temperature changes. Turbidity analysis and dynamic light scatting (DLS) measurement illustrated that PIL-based nanogel solutions presented the phase transform with upper critical solution temperature (UCST) in the range of 5–25 °C. The nanogels were characterized using Fourier transform infrared (FTIR), thermogravimetric analyses (TGA), and scanning electron microscopy (SEM). In addition, BIm-based nanogels could also be used as highly active catalysts in the cycloaddition reaction of CO2and epoxides. As a result, our attributes build a robust platform suitable for the preparation of polymeric nanomaterials, as well as CO2conversion.Keywords:ionic liquids;thermo-response;nanogels;cross-linking polymerization;UCST;CO2conversion
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL LETTERS
·
2014
·
IF 1.019
Ou Sha,Xiashi Zhu
A new simplified extraction of gold(III) using a room-temperature ionic liquid prior to determination by flame atomic absorption spectrometry has been developed. The extraction method uses 1-butyl-3-methylimidazolium hexafluorophosphate without a chelating agent. The parameters of the extraction system were investigated in detail. Under the optimized conditions, a linear range of 0.19 to 38.20 µg · mL−1, a limit of detection of 0.072 µg · mL−1, an enrichment factor of 10.0, and an extraction capacity of 6.6 mg · g−1 were obtained. The extraction mechanism and the selectivity of 1-butyl-3-methylimidazolium hexafluorophosphate for gold(III) were also investigated. The method was applied for the determination of gold(III) in water samples with satisfactory results.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2014
·
IF 3.511
Xiaofeng Wang,Zheng You,Hailiang Sha,Yong Cheng,Huanhuan Zhu,Wei Sun
A DNA and graphene (GR) bi-layer modified carbon ionic liquid electrode (CILE) was fabricated by an electrodeposition method. GR nanosheets were electrodeposited on the surface of CILE at the potential of −1.3 V and then DNA was further deposited at the potential of +0.5 V on GR modified CILE. Electrochemical performances of the fabricated DNA/GR/CILE were carefully investigated. Then electrochemical behaviors of dopamine (DA) on the modified electrode were studied with the calculated electrochemical parameters. Under the optimized conditions, a linear relationship between the oxidation peak current and the concentration of DA was obtained in the range from 0.1 μmol/L to 1.0 mmol/L with a detection limit of 0.027 μmol/L (3 σ ). The modified electrode exhibited excellent reproducibility, repeatability, stability, validation and robustness for the electrochemical detection of DA. The proposed method was further applied to the DA injection solution and human urine samples determination with satisfactory results.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Mingjun Dong,Zhihan Nan,Panpan Liu,Yanjun Zhang,Zhonghua Xue,Xiaoquan Lu,Xiuhui Liu
A novel scheme for fabrication of hydrophobic ionic liquid-capped gold nanoparticles (IL-capped AuNPs) modified electrode is presented and its application potential for cholesterol biosensor is investigated. Highly stable gold nanoparticles were characterized by UV–vis absorption spectroscopy and transmission electron microscopy (TEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) indicated that IL-capped AuNPs nanocomposites showed excellent electrical conductivity. Furthermore, cholesterol oxidase (ChOx) was directly immobilized on the IL-capped AuNPs nanocomposite, and then the direct electrochemistry of ChOx on the modified glass carbon electrode (GCE) was obtained. As a new platform in cholesterol analysis, ChOx-IL-capped AuNPs/GCE exhibited a linear response to cholesterol in the range of 0.1–50 μM with a detection limit of 0.033 μM. Therefore, hydrophobic ionic liquid-capped gold nanoparticles would serve as a good candidate material to construct the related enzyme biosensors.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2013
·Vol. 405
·期 29
·9563-9570
·
IF 3.659
Liu Haiqing,Zhang Lina,Chen Jiangmin,Zhai Yunyun,Zeng Yanbo,Li Lei
Novel imidazole fluorescent ionic liquids with anthracene groups (ImS-FILA) were synthesized for the first time to act as fluorescent probes. They were developed for the determination of superoxide anion radicals (O 2
•- ) in an aqueous system. O 2
•- was produced by pyrogallol autoxidation. The fluorescence of ImS-FILA was quenched by superoxide anion radicals. The π-bond structure of the fluorescent molecules was oxidized and damaged. This method is very simple and sensitive. The linear range of sensitivity was 1–70 μM ImS-FILA, and the detection limit for reactive oxygen species was 0.1 μM. This method was used to detect superoxide radicals in papaya and garlic, with satisfactory results. Further work is needed to demonstrate the utility of this method in detecting reactive oxygen species in a biological aqueous system.
Reaction of fluorescent probes with O 2
•- and the fluorescence change
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Mingtao Li,Bolun Yang,Lu Wang,Ying Zhang,Zhan Zhang,Shaohua Fang,Zhengxi Zhang
New polymerized ionic liquids (PILs) based on tetraalkylammonium cations with N(CF 3 SO 2 ) 2 − (TFSI − ) anions are synthesized by homopolymerization and anion exchange reaction. Furthermore, a gel polymer electrolyte membrane based on the PILs as polymer host is prepared incorporating a tetraalkylammonium ionic liquid, LiTFSI salt and nano-size SiO 2 . The gel polymer electrolyte membranes show exceptional thermal and electrochemical properties . They are found to be thermally stable up to 336 °C. With the increase of the IL, T g of the PIL-based electrolyte samples decreases obviously. When the IL concentration is 25 wt%, the ionic conductivity of the electrolytes reaches 4.9×10 −4 S cm −1 at 60 °C. After 130 cycles, the Li/LiFePO 4 battery with the gel polymer electrolyte membranes at 60 °C has discharge capacity of 122 mA h g −1 at 0.1 current rates.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 15
·5886-5890
·
IF 1.938
Wenzhi Tang,Jiazheng Zhou,Qunqing Yang,Qiqi Zheng,Jian Wu
A novel electrode made of carbon nanotube and ionic liquid (n-octylpyridinium hexafluorophosphate) was developed for the solid-phase extraction and detection of methyl parathion (MP). The electrode effectively accumulated MP and increased the cathodic peak current. Cyclic voltammetry was used to characterize the fabricated electrode and the electrochemical properties of MP on it. Linear sweep voltammetry was used for the quantitative detection of MP. A self-correcting algorithm was exploited to isolate the small peak of MP from the large background current, obtaining a remarkable peak for MP along with a flat baseline. With a preconcentration time of 3 minutes, the peak current was linear for MP concentrations in the range from 0.1 to 2.5 μg mL−1 with a detection limit of 0.008 μg mL−1 (S/N = 3). The electrode was applied to detect MP in soil and food samples. These results indicated that the proposed method was capable of monitoring MP, providing a simple approach for routine analysis.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2014
·Vol. 32
·期 5
·434-442
·
IF 1.04
Changhua Song,Hui Liu,Yuan Li,Shuai Ge,Hongwei Wang,Wenshuai Zhu,Yonghui Chang,Changri Han,Huaming Li
A series of metal-Al 2 O 3 catalysts were prepared simply by the conventional impregnation with Al 2 O 3 and metal chlorides, which were applied to the dehydration of fructose to 5-hydroxymethylfurfural (HMF). An agreeable HMF yield of 93.1% was achieved from fructose at mild conditions (100°C and 40 min) when employing Cr(III)-Al 2 O 3 as catalyst in 1-butyl-3-methylimidazolium chloride ([Bmim]Cl). The Cr(III)-Al 2 O 3 catalyst was characterized via XRD, DRS and Raman spectra and the results clarified the interaction between the Cr(III) and the alumina support. Meanwhile, the reaction solvents ([Bmim]Cl) collected after 1 st reaction run and 5 th reaction run were analyzed by ICP-OES and LC-ITMS and the results confirmed that no Cr(III) ion was dropped off from the alumina support during the fructose dehydration. Notably, Cr(III)-Al 2 O 3 catalyst had an excellent catalytic performance for glucose and sucrose and the HMF yields were reached to 73.7% and 84.1% at 120°C for 60 min, respectively. Furthermore, the system of Cr(III)-Al 2 O 3 and [Bmim]Cl exhibited a constant stability and activity at 100°C for 40 min and a favorable HMF yield was maintained after ten recycles.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 47
·41404-41409
·
IF 3.289
Wei-Hong Zhang,Shan-Shan Liu,Ping Liu,Jie Xu,Bing Xue,Xian-Yong Wei,Yong-Xin Li
Chitosan immobilized with an acidic ionic liquid (CS–VImPS–PW) was fabricated via a radical addition reaction of N-vinylimidazoliumpropane sulfonate and chitosan, followed by acidification with a heteropolyacid. It was characterized by a Fourier transform infrared spectrometer, solid-state 13C nuclear magnetic resonance spectrometer, thermogravimetric analyzer, elemental analyzer, and Hammett indicator. Some acetalization reactions were investigated to evaluate the catalytic activity of CS–VImPS–PW. The results show that CS–VImPS–PW is highly active for the acetalization reactions in high acetal yields ranging from 83.2 to 96.2% and can be reused 8 times without noticeable loss of activity.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2017
·Vol. 9
·期 10
·526
·
IF 3.364
Hui Zhang,Yaoguang Xu,Yuqi Li,Zexiang Lu,Shilin Cao,Mizi Fan,Liulian Huang,Lihui Chen
A facile cellulose solvent 1,3-diallyl-2-ethylimidazolium acetate ([AAeim][OAc]) with high electrical conductivity has been designed and synthesized for the first time, via a quaternization reaction and ion exchange method. The dissolution characteristics of cellulose in this solvent were studied in detail. Meanwhile, the co-solvent system was designed by adding an aprotic polar solvent dimethyl sulfoxide (DMSO) in [AAeim][OAc]. The effects of temperature and the mass ratio of DMSO to [AAeim][OAc] on the solubility of cellulose were studied. Furthermore, the effects of regeneration on the molecular structure and thermal stability of cellulose were determined by Fourier transform infrared spectroscopy (FT-IR), thermal gravity analysis (TGA) and X-ray diffraction (XRD). The findings revealed that the synthesized ionic liquid (IL) has a relatively low viscosity, high conductivity and a good dissolving capacity for bamboo dissolving pulp cellulose (Degree of Polymerization: DP = 650). The macromolecular chain of the cellulose is less damaged during the dissolution and regeneration process. Due to the increased number of “free” anions [OAc]−and cations [AAeim]+, the addition of DMSO can significantly increase the solubility of the cellulose up to 12 wt % at the mass ratio of 3:1, indicating that the synthesized IL has a potential application in the electrospinning field.Keywords:1,3-diallyl-2-ethylimidazolium acetate;ionic liquid;co-solvent system;solubility of cellulose;electrospinning
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Haizhou Lin,Jingping Chen,Yuan Zhao,Shurong Wang
To obtain an efficient and green reaction system for the production of furfural (FF), this study investigated the use of a SO3H-functionalized ionic liquid as a catalyst for the conversion of xylose in a solvent of renewable γ-valerolactone (GVL). A high FF yield of 78.12% was obtained in this reaction system catalyzed by 1-propylsulfonic-3-methylimidazolium chloride at 140 °C. The GVL remarkably enhanced the reaction rate and increased the xylose conversion and FF yield because the solvent effect of GVL could improve the catalytic activity of the acidic protons and suppress the side reactions. In addition, the ionic liquids showed satisfactory catalytic performance in the conversion of xylose to FF due to functionalization by introducing a SO3H group. The conversion of other C5 carbohydrates (arabinose and xylan) was also tested in this system, and moderate FF yields were achieved.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）