JOURNAL OF MOLECULAR LIQUIDS
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2018
·
IF 4.513
Yuanchao Pei,Lihui Hao,Jie Ru,Yuling Zhao,Huiyong Wang,Guangyue Bai,Jianji Wang
Self-assembly of ionic liquids (ILs) surfactants in ILs solvents is important from the viewpoint of both scientific research and practical application because of the advantages of high ionic nature and possible application at high temperature. In this work, the aggregation behavior of long-chain ionic liquids 1-alkyl-3-methylimidazolium chloride [C n mim]Cl ( n = 12, 14, 16) and N -alkyl- N , N -dimethylethanolammonium [C n DMEA]Cl (n = 12, 14, 16) in a protic ionic liquid, ethanolammonium nitrate (EOAN), is investigated by surface tension measurements. The variation of micellization parameters with alkyl chain length and head group type of the ILs surfactants is analyzed and compared with that in water and in ethylammonium nitrate (EAN). It is found that the critical micelle concentration (cmc) values of the IL surfactants, such as [C 12 mim]Cl, in EOAN are 27 times smaller than those in EAN, and 4 times smaller than those in water. This suggests that EOAN is a better self-assembly medium for the ILs surfactants. It is also found that the contribution of head groups of the ILs surfactants to the cmc values is different in EOAN, water and EAN, while the contribution of CH 2 group in the alkyl chain of the ILs surfactants is generally independent of the solvents nature.
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INDUSTRIAL CROPS AND PRODUCTS
·
2018
·
IF 3.849
Qian Guan,Tingzhou Lei,Zhiwei Wang,Haiyan Xu,Lu Lin,Gaofeng Chen,Xueqin Li,Zijie Li
Wheat straw, a typical lignocellulosic biomass, is difficult to be liquefied because of its complex structure, which limits its further conversion to valuable products. Ionic liquid can dissolve the cellulose, which can destroy the connection of biomass components. Ionic liquids, [BMIM][HSO 4 ], [BMIM][Cl], and [HSO 3 -BMIM][HSO 4 ], were used in the liquefaction of wheat straw to produce ethyl levulinate (EL) in a one-pot reaction under mild conditions in ethanol, which served as both solvent and reactant. The highest conversion rate, 85.50%, was obtained following reaction at 200 °C for 60 min using the acidic ionic liquid 1-methyl-3-(4-sulfobutyl) imidazole bisulphate as the catalyst. Under optimal conditions, ethyl levulinate was obtained with a yield of 16.23% and its content in the liquid products was 28.11%. Without the acidic ionic liquid catalyst, the conversion rate of wheat straw and the yield of ethyl levulinate were only 22.33% and 6.23%, respectively. Of the catalysts evaluated, [HSO 3 -BMIM][HSO 4 ] was the most effective, and its recovery rate was 64.71%. This study provides a theoretical basis for the development and utilisation of low-corrosion and environment-friendly catalysts for liquefaction processes for the preparation of high-grade chemicals.
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RSC Advances
·
2018
·Vol. 8
·期 39
·21850-21856
·
IF 2.936
Wei Xu,Qingzhou Dai,Yuzhi Wang,Xiaojian Hu,Panli Xu,Rui Ni,Jiaojiao Meng
A novel magnetic (Fe3O4) surface molecularly imprinted polymer (MIP) based on ionic liquid (IL) (Fe3O4@VTEO@IL-MIPs) was prepared for the selective extraction of lysozyme (Lys). As the functional monomer of the MIPs, an imidazolium-based IL with vinyl groups was prepared. It can provide multiple interactions with template molecules. The amount of IL was optimized (200 mg). Fourier transform infrared spectrometry (FT-IR), transmission electron microscopy (TEM), dynamic light scattering (DLS), thermogravimetric analysis (TGA) and a vibrating sample magnetometer (VSM) were used to characterize the MIP. The results indicate the successful formation of an imprinting polymer layer. The concentration of Lys in the supernatant was determined by UV-vis spectrophotometry at a wavelength of 280 nm. The maximum adsorption capability of the MIP is 213.7 mg g−1 and the imprinting factor (IF) is 2.02. It took 2.5 h for the MIP to attain adsorption equilibrium. The structure of the protein was evaluated using circular dichroism (CD) spectra and UV-visible spectra. The adsorption performance was further investigated in detail by selective adsorption experiments, competitive rebinding tests, and reusability and stability experiments. Furthermore, it was utilized to separate the template protein from a mixture of proteins and real samples successfully because of the high adsorption capacity for Lys.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yimin Zhang,Youhai Cao,Dong Chen,Penglei Cui,Jun Yang
The use of Ionic Liquids (ILs) to enhance the electrocatalytic activity of metal nanoparticles has garnered sustained research interest. However, current strategies involving ionic liquids do not exploit their use and advantages in chemical synthesis of metal nanoparticles. Herein, we demonstrate a straightforward method, which combines the advantages of ILs in nanoparticle synthesis with the potentials of ILs in electrocatalysis , for the synthesis of Pd nanoclusters for electrochemical oxidation of formaldehyde. This method relies on the use of 1-(2′-aminoethyl)-3-methyl-imidazolum tetrafluoroborate ionic liquid as stabilizers to directly generate Pd nanoclusters with average sizes of 1.8 ± 0.3 nm in a reaction medium consisting of water and methanol at room temperature . The electrochemical measurements prove that the ionic liquid-assisted Pd nanoclusters have mass-normalized activity approximately 7 times than that of commercial Pd/C catalysts for the oxidation of formaldehyde.
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GREEN CHEMISTRY
·
2018
·Vol. 20
·期 18
·4236-4244
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IF 8.586
Xiaoyan Pei,Dazhen Xiong,Yuanchao Pei,Huiyong Wang,Jianji Wang
Phase separation of microemulsions plays an important role in many applications such as oil recovery, nanomaterials synthesis, and chemical reactions. However, reversible switching from ionic liquid-based microemulsions to complete oil–water phase separation has not been reported so far. In this work, we developed a novel class of stimuli-responsive microemulsions composed of CO2-responsive ionic liquids, n-pentanol and water. The microstructures and phase behavior of the microemulsion systems before and after the bubbling of CO2 were investigated by electrical conductivity, dynamic light scattering, small-angle X-ray scattering, cryogenic transmission electron microscopy, and optical microscopy. It was found that these microemulsions could be reversibly switched from W/O monophase to complete oil–water phase separation upon alternate bubbling and removal of CO2 at atmospheric pressure. Furthermore, 13C NMR spectroscopy was used to understand the CO2-driven reversible phase separation of the microemulsions. The results suggest that the mechanism behind the reversible phase separation involved the reversible formation of bicarbonate and carbamate from the reaction between CO2 and the anions of the ionic liquids in the presence of water, which resulted in the increase of ionic strength (or vice versa) in the mixture. Using the microemulsions as microreactors, the phase separation protocol was applied in the Knoevenagel reaction for an efficient coupling of a chemical reaction, product separation, and recycling of the microemulsions.
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RSC Advances
·
2019
·Vol. 9
·期 15
·8137-8145
·
IF 3.049
Shifu Cheng,Bihua Chen,Li Qin,Yongya Zhang,Guohua Gao,Mingyuan He
A soluble and easily dispersive cross-linked poly(ionic liquid), copolymer of 1-vinyl-3-butylimidazolium bromide ([VBIM][Br]) and divinylbenzene (DVB), was used as a precursor for nitrogen doped porous carbons (NPCs) with SiO2 (from tetraethyl orthosilicate) as a template. The NPCs were characterized by infrared (IR) spectroscopy, nitrogen adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, thermo gravimetric analysis (TGA), elemental analysis and X-ray photoelectron spectroscopy (XPS). The specific surface area and porosity of NPCs depended on the carbonization temperature, the SiO2/[VBIM][Br] ratio and the precursors. Under the optimized conditions, the NPC prepared from cross-linked poly(ionic liquid), P([VBIM][Br]–0.1DVB), gave a high specific surface area up to 1324 m2 g−1. XRD indicated that amorphous and disordered graphitic layers were dominant in NPCs. The nitrogen content was about 4–5 wt% in NPCs, and the nitrogen bonding state observed using XPS analysis was mainly pyridinic- and pyrrolic-N. Meanwhile, the cyclic voltammetry, gravimetric charge–discharge curves and electrochemical impedance spectroscopy of the NPCs were also investigated, the specific capacitance was up to 243 F g−1 at 0.1 A g−1, and the retention ratio was nearly 100% after charge–discharge cycling 2400 times at 2 A g−1 in 6 M KOH electrolyte.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 6
·929-933
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IF 1.024
Bu Luxia,Liu Daying,Wei Zhen,Ma Zhanlin
The preparation and characterization of homogeneous and colorless ionic liquid analogs(ILAs) containing choline chloride(ChCl), malonic acid and bismuth chloride were investigated. The structure of the above mixture was preliminarily analyzed, and then the physicochemical properties including viscosity, conductivity and density were investigated as functions of temperature and composition. Additionally, the thermal stability of the ILAs and the electrochemical behavior of Bi3+ ions in the medium were studied. Structure analysis reveals that the synthesis of deep eutectic solvents(DESs) is closely related to the formation of hydrogen bonds between malonic acid and ChCl, with their viscosity, conductivity and density being greatly dependent on the temperature and composition. Thermogravimetric analysis demonstrates that the ILAs are very stable between room temperature and 398.15 K. And the electrochemical experiments indicate that the bismuth films can be successfully deposited from this ILAs and the deposition mechanism of bismuth is a rather irreversible process. The surface morphology of bismuth films deposited on Cu substrates was very compact and smooth. Thus, ChCl-malonic acid DESs were shown to be a good alternative to aqueous solvents for various deposition-related applications.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2012
·
IF 0.941
Shi-Ping RU,Jian WU,Yi-Bin YING,Feng JI
An electrochemical method to continuously detect alkaline phosphatase (AP) was developed. Using home-made ionic liquid modified carbon nanotubes electrode (CNTs-ILE), on the basis of the characteristics of CNTs-ILE and the substrate p -nitrophenyl phosphate (PNPP) and product p -nitrophenol (PNP), the continuous detection of the process of AP enzymatic reaction with amperometry was achieved. The results indicated that the cyclic voltammetry feature of the CNTs-ILE was superior to conventional glassy carbon electrode, also a good anti-passivation characteristic was achieved for the detection of PNP. When the concentration of AP was in the range of 1.0 −100 U L −1 , the current showed a good linear relationship to the concentrations of AP. This method was quick to detect AP, and detection time was less than 20 min.
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GREEN CHEMISTRY
·
2024
·
IF 9.3
Yanhui Hu,Hua Yue,Shiqi Huang,Bingxi Song,Yuyuan Xing,Minmin Liu,Gongying Wang,Yanyan Diao,Suojiang Zhang
Paclitaxel (PTX) is a crucial medication employed in the treatment of various cancers, and its limited solubility has been a persistent clinical hurdle. Ionic liquids (ILs), considered as “green solvents”, possess remarkable attributes such as exceptional miscibility, tailorable properties, and versatility. These properties have ushered in a revolution in the realm of biomedicine, particularly in addressing the solubility challenges of poorly soluble drugs. In this work, low-toxicity diimidazolium based ILs were introduced into a PTX dissolution system for the first time. Compared to mono-imidazolium based ILs, diimidazolium based ILs exhibited lower in vitro cytotoxicity and the substitution of Cremophor EL (CrEL) with biocompatible [C10(MIM)2][Br]2 and water resulted in lower cytotoxicity at a certain concentration. Furthermore, [C10(MIM)2][Br]2 could effectively improve the solubility of PTX, and this enhancement was strongly correlated with the length of the carbon chain in the cation and the IL concentration. Significantly, the [C10(MIM)2][Br]2-based dissolution system demonstrated the capability to attain a PTX content that is on par with the widely used commercial drug Taxol. Besides, the [C10(MIM)2][Br]2–PTX complex displayed excellent physical stability for a long period of time, with no significant change of PTX concentration in the solution. Additionally, various interactions existed between [C10(MIM)2][Br]2 and PTX, encompassing hydrophobic interactions, π–π stacking, CH–π interactions, and hydrogen bonds. The results indicated that the diimidazolium based IL system showed promise as a biocompatible platform for the delivery of PTX.
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Materials Science & Engineering C-Materials for Biological Applications
·
2015
·
IF 3.088
Chengli Yao,Anjian Xie,Yuhua Shen,Jinmiao Zhu,Hongying Li
Nacre-like calcium carbonate nanostructures have been mediated by an ionic liquid (IL)-graphene oxide (GO) composite template. The resultant crystals were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray powder diffractometry (XRD). The results showed that either 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF 4 ) or graphene oxide can act as a soft template for calcium carbonate formation with unusual morphologies. Based on the time-dependent morphology changes of calcium carbonate particles, it is concluded that nacre-like calcium carbonate nanostructures can be formed gradually utilizing [BMIM]BF 4 /GO composite template. During the process of calcium carbonate formation, [BMIM]BF 4 acted not only as solvents but also as morphology templates for the fabrication of calcium carbonate materials with nacre-like morphology. Based on the observations, the possible mechanisms were also discussed.
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POLYMER
·
2016
·
IF 3.586
Yong Zuo,Zhenqian Jiao,Li Ma,Pengfei Song,Rongmin Wang,Yubing Xiong
In this study, novel thermo-responsive nanogels were facilely fabricated via ternary cross-linking copolymerization of ionic liquid (IL)-based monomers and cross-linker in methanol. To achieve the thermo-responsive performance of nanogels, monomers with hydroxyl or carboxyl group which can contribute to hydrogen (H)-bonding interaction is the key point of this strategy. The thermo-responsive behavior of poly(ionic liquid)s (PIL)-based nanogels were testified using dynamic light scattering (DLS), turbidimetric method, and differential scanning calorimetry (DSC) measurements. The results demonstrated that these novel nanogels presented reversible upper critical solution temperature (UCST) phase transition with the temperature changing. And their UCSTs could be tuned via the feed ratio of IL-based monomers and cross-linker. The nanogels were also measured using scanning electronic microscopy (SEM), thermo-gravimetric analyses (TGA) and Fourier transform infrared spectroscopy (FT-IR) techniques. In addition, a possible mechanism of thermo-responsive performance was suggested based on the above results. As a result, our findings provide an efficient and applicable platform for the fabrication of thermo-responsive polymeric nanomaterials .
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LANGMUIR
·
2016
·
IF 3.993
Yanjun Gong,Qiongzheng Hu,Chen Wang,Ling Zang,Li Yu
We report fabrication, characterization, and potential applications of polyoxometalate (POM)/ionic liquid (IL) supramolecular spheres in water for the first time. These supramolecular spheres have highly ordered structures and show excellent reversible self-assembly and tunable photoluminescence properties, which can be manipulated by adjusting pH of the aqueous solution. Specifically, the formation of POM/IL supramolecular spheres results in quenching of fluorescence emitted by Eu-POM because hopping of the d1 electron in the POM molecule is blocked by hydrogen bond existing between the oxygen atom of POM and the carboxylic acid group of IL. However, the fluorescence can be completely recovered by gradually increasing pH of the aqueous solution due to the pH-induced deprotonation of the carboxylic acid group of IL, which results in disassembly of the fabricated supramolecular spheres. Applications of these stimuli-responsive photoluminescent POM-based supramolecular materials are demonstrated in biological media. Dual signaling responses of turbidity and fluorescence are observed simultaneously in the detection of urease and heavy metals based on pH-induced disassembly of the supramolecular spheres during the biochemical events in aqueous solution. In addition, guest molecules are encapsulated into the supramolecular spheres, and controlled release of these entrapped molecules is demonstrated in the presence of external stimuli. This study shows potential of stimuli-responsive POM/IL supramolecular materials in biological applications.
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