JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 42
·48051
·
IF 2.188
Xu Feng,Jingtu Yi,Wenxia Zhang,Yanhui Niu,Lan Xu
In this article, a redox-responsive poly(ionic liquid) (redox-PIL) hydrogel Poly(1-vinyl-3-propionate imidazole phenothiazine sulfonic acid)-chitosan [Poly(VPI + PTZ-(CH 2 ) 3 SO 3 − )-CS] was produced by using chitosan (CS) crosslinking with redox-PIL Poly(1-vinyl-3-propionate imidazole phenothiazine sulfonic acid [Poly(VPI + PTZ-(CH 2 ) 3 SO 3 − )]. The incorporation of redox-active counter anions 3-(phenothiazine-10-yl) propane 1-sulfonic acid anions (PTZ-(CH 2 ) 3 SO 3 − ) into cationic PIL-polyimidazole rendered Poly(VPI + PTZ-(CH 2 ) 3 SO 3 − ) with electron catalytic ability, ionic conductivity, and electron conductivity. Poly(VPI + PTZ-(CH 2 ) 3 SO 3 − )-CS combines the properties of hydrogel and redox-PIL, thus offering intrinsic porous conducting frameworks and promoting the transport of charges, ions, and molecules, leading hydrogel with excellent electrochemical properties. The crosslinking occurrence of Poly(VPI + PTZ-(CH 2 ) 3 SO 3 − ) and CS resulting from the synthetic process of hydrogel was verified by differential scanning calorimetry and thermogravimetric analysis. A three-dimensional polymer network hydrogel with good biocompatibility and permeability was formed after crosslinking. In addition, only 64% weight loss within 600 °C was observed in Poly(VPI + PTZ-(CH 2 ) 3 SO 3 − )-CS representing its thermally stable performance. When used as an electrochemical sensor, the hydrogel-modified gold electrode improved the electrocatalytic oxidation of cysteine. Differential pulse voltammetry results indicated that the detection range was from 5 × 10 −8 to 5 × 10 −3 M and the limit of detection was 6.64 × 10 −8 M. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48051.
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高影响因子
ENERGY & FUELS
·
2018
·
IF 3.024
Yannan Li,Jun Cheng,Leiqing Hu,Jianzhong Liu,Junhu Zhou,Kefa Cen
An ionic liquid (IL) [P66614][Triz] with a low regeneration temperature was loaded on a graphene nanoplatelet (GNP) and reduced graphene oxide (RGO) to accelerate the CO2 absorption rate. High-resolution transmission electron microscopy (HRTEM) patterns showed that GNP was composed of a regular “honeycomb” lattice, but a regular lattice structure was not observed for RGO as a result of the functional group on it. The CO2 absorption capacity (63.6 mg of CO2/g of IL) and absorption peak rate (22.4 mg of CO2 g–1 of IL min–1) of IL loaded on GNP were increased by 8.2 and 72.3%, respectively, compared to those of neat IL. The supported IL performed better because [P66614][Triz] was oriented in a favorable dispersion as a result of the negative ζ potential of the GNP surface. In contrast, the CO2 absorption rate of RGO–20% IL (mass ratio of RGO/IL = 4:1) was lower than that of IL, which could be attributed to the hydrogen bond between surface oxygen functional groups and IL. 13C nuclear magnetic resonance and Mulliken atomic charge calculated by Gaussian were used to support the CO2 absorption mechanism.
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高影响因子
MOLECULES
·
2018
·Vol. 23
·期 9
·2309
·
IF 3.098
Liling Wang,Minge Bai,Yuchuan Qin,Bentong Liu,Yanbin Wang,Yifeng Zhou
Ionic liquids (ILs), known as environmentally benign “green” solvents, were developed as an optimal solvent for the green extraction and separation field. In this paper, an ionic liquid-based ultrasonic-assisted extraction (IL-UAE) of flavonoids (FVs) from bamboo leaves ofPhyllostachys heterocyclawas developed for the first time. First, 1-butyl-3-methylimidazolium bromide ([Bmim] Br), with the best extraction efficiency, was selected from fifteen ionic liquids with diverse structure, like carbon chains or anions. Then, the influencing parameters of ionic liquid (IL) concentration, liquid-solid ratio, ultrasonic time, and ultrasonic power, were investigated by single factor tests, and further optimized using response surface methodology (RSM). In the optimization experiment, the best conditions were 1.5 mol/L [BMIM]Br aqueous solution, liquid-solid ratio 41 mL/g, ultrasonic time 90 min, and ultrasonic power 300 W. Furthermore, the microstructures of bamboo leaves and the recovery of FVs and [BMIM]Br were also studied. Therefore, this simple, green and effective IL-UAE method has potentiality for the extraction of FVs from bamboo leaves for the large-scale operations.Keywords:Phyllostachys heterocycle;bamboo leaves;ionic liquid;ultrasonic-assisted extraction;flavonoids
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PubMed
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 12
·7053-7064
·
IF 3.809
Pang Zhiqiang,Wang Peiyu,Dong Cuihua
Abstract Currently, cellulose nanocrystals (CNCs) are primarily prepared with acid-catalyzed hydrolysis process using strong mineral acid. However, it suffers from low yield and high dosage of acid. For high yield and low dosage of acid, we prepare CNCs by two steps method. Firstly, the cellulose was ultrasonically pretreated in ionic liquid (IL) at mild conditions. Secondly, the samples were hydrolyzed by H 2 SO 4 with concentration of 20–23%. The results showed that during ultrasonic pretreatment at mild conditions, accessibility and susceptibility of the amorphous region in cellulose was substantially enhanced upon cooperative action of ultrasonication and ILs. Meanwhile, the crystalline region of cellulose was retaining untouched, and further results in the fact that enhanced reactivity of the amorphous region enabled acid-catalyzed hydrolysis to proceed smoothly. Experimental results show that the extracted CNCs exhibited rod-like shape with dimension of 220–300 nm in length and 15–22 nm in width. It’s also shown that thermostability of CNCs was greatly enhanced compared to that prepared by the traditional process. Ultrasonic pretreatment of cellulose in ILs offered a promising and efficient system for CNCs preparation with high yield, crystallinity and low dosage of acid. Graphical abstract
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高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2018
·
IF 2.311
Qingsong He,David Vokoun,Tyler Stalbaum,Kwang J. Kim,Alexander I. Fedorchenko,Xiangman Zhou,Min Yu,Zhendong Dai
In this paper, an ionic polymer-graphene film composite (IPGC) sensor comprised of an ionic polymer membrane sandwiched between two graphene electrodes was demonstrated, the mechanoelectrical properties were investigated on home-built experimental setup and a physical mechanoelectrical model that takes ion transportation into account was presented using Comsol Multiphysics software for numerical simulations. Scanning electron microscope observation shows that the graphene electrode is tight coupling with chitosan polymer. Experimental verification indicates that as the frequency of input displacement increases from 2 to 10 Hz, the voltage output increases from 2.95 to 13.56 mV under the peak-to-peak amplitude of sinusoidal vibration of 2 mm. Compared with conventional ionic polymer metal composite (IPMC) sensor, IPGC in this work generates 2.74∼4.52 times higher output voltage, which is attributed to high initial cation concentration (∼4250 mol/m 3 ), and IPGC shows the relatively stable mechanoelectrical property because of the crackless graphene electrode and the stable ionic liquid. Model analysis shows that a fair agreement between the simulated and measured data is achieved and the peak-to-peak amplitude of the generated voltage increases with the increasing frequency in the range from 2 to 10 Hz with the increase rate about 1.2–1.4 mV/Hz. This paper provides the understanding of the mechanoelectrical transduction mechanism and property, which can be used for development of sensors and energy harvesters.
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高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 40
·6328-6337
·
IF 3.304
Kaisheng Yao,Chenchen Zhao,Nan Wang,Weiwei Lu,Huiyong Wang,Shuang Zhao,Jianji Wang
In this work, a simple, rapid and economic one-pot strategy is developed for the synthesis of 3D nanoporous gold (NPG) in aqueous solution with the assistance of a functionalized ionic liquid, 1-hydroxyethyl-3-methylimidazolium chloride ([HEmim]Cl), at room temperature. It is shown that 3D NPG is constructed from twisted and interconnected Au nanochains with diameters of approximately 40 nm. This material has a high specific surface area of 22.77 m2 g−1 and various porous structures, including macropores, mesopores and micropores. Yet, there are lots of crystal defects, such as a twin boundary, edge atoms and amorphous regions. It is demonstrated that [HEmim]Cl plays an important role in directing the growth and assembly of 3D NPG, and the ionic liquid concentration, the amount of reductant and the reaction temperature also have influences on the morphology and structure of NPG to a certain extent. Based on control experiments, a possible growth mechanism is illustrated for the formation of 3D NPG. In addition, the as-prepared 3D NPG exhibits superior catalytic activities for both the reduction of p-nitrophenol and the degradation of methylene blue in water, which can be completed in 14 min and 8 min, respectively, at 25 °C.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 33
·期 2
·245-255
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IF 1.42
Zhang Di,Yin Jun,He Fei,Ge Ni-lin,Wu Zong-quan,Ding Yun-sheng
We report on the preparation of a well-defined star-shaped tricationic ionic liquid possessing three arms of poly(ethylene glycol) functionalized imidazolium rings. Remarkable solubility was found in most of the organic solvents we used. Thermogravimetric analysis (TGA) exhibited excellent thermal stability and two distinct decomposition temperatures were attributed to two kinds of chemical degradation. Differential scanning calorimetry (DSC) was further employed to investigate the thermal phase transitions, that three different signals ( T
g , T
c , and T
m ) were shown upon the second heating process. Moreover, CH 2 Cl 2 solution of the ionic liquid expressed an excitation-wavelength dependent fluorescence response, leading to the facile modulation of photoluminescence behavior. This work represents an example of utilizing molecular design to construct novel ionic liquids and endow further potential to be used in the engineering materials.
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高影响因子
MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 5
·565-572
·
IF 3.719
Ma Ming,Tu Xiaojing,Zhan Guoqing,Li Chunya,Zhang Shenghui
The ionic liquid 1-butyl -3-[3-(N-pyrrole)-propyl]imidazolium tetrafluoroborate was employed to fabricate a glassy carbon electrode (GCE) modified with a porous film of a polymerized ionic liquid. The resulting film electrode was treated with sodium dodecyl sulfonate solution to exchange the terafluoroborate anions by dodecyl sulfonate groups. This was confirmed by X-ray photoelectron spectroscopy. The morphology of the modified GCE was characterized by scanning electron microscopy and revealed a nanoporous surface. The electrochemical properties of this film electrode were studied by electrochemical impedance spectroscopy using the hexacyanoferrate(II/III) system as an electroactive probe. The response to bisphenol A was investigated by voltammetry. Compared to the unmodified GCE, the oxidation potential is positively shifted, and the oxidation peak current is strongly increased. Experimental conditions were optimized and resulted in an oxidation peak current that is linearly related to concentration of bisphenol A in the 10 nM to ~ 10 μM range. The detection limit is 8.0 nM (at S / N = 3). The electrode was successfully applied to the determination of bisphenol A in leachates of plastic drinking bottles, and its accuracy was verified by independent assays via HPLC.
A poly{1 -butyl -3 -[3 -(N -pyrrole)propyl] imidazolium dodecyl sulfonate ionic liquid} nanoprous film electrode was fabricated with potential step technique and anionic exchange. The obtained polymerized ionic liquid film electrode was demonstrated possessing enhanced effects for bisphenol A determination.
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高影响因子
Energy & Environmental Science
·
2015
·Vol. 9
·期 1
·224-231
·
IF 20.523
Lina Wang,Jingyuan Liu,Shouyi Yuan,Yonggang Wang,Yongyao Xia
Li–S batteries generally suffer from severe self-discharge when resting due to an internal polysulfide shuttle effect. Soluble long-chain polysulfide species (Li2Sx, 4 ≤ x ≤ 8) would continue to dissolve and migrate to the negative side to react with metallic Li. Here, we demonstrate pronounced suppression of polysulfide shuttle using an ionic liquid of the N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide (PP13TFSI)-based electrolyte. When working in combination with LiNO3, zero self-discharge can be achieved to rest a full-charged Li–S cell for two days. The fascinating study clearly demonstrates that a promising practical Li–S battery with low self-discharge depends on both improvements on polysulfide diffusion control and Li-metal stabilization.
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 15
·7919-7928
·
IF 7.443
Ying Tang,Beibei Tang,Peiyi Wu
A temperature-responsive composite membrane with tunable responsive behavior was prepared by covalently grafting a polymeric ionic liquid (PIL) functionalized temperature-responsive copolymer onto the brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) supporting membrane. The “switch” effect of the composite membrane can be facilely adjusted by tuning the counter-ion of PIL units of the grafted copolymer based on the transformation between hydrophilicity and hydrophobicity of PIL. The response temperature of the composite membrane was decreased with increasing the content of hydrophobic PIL units. Both the pure water flux and rejection of dyes and polyethylene glycol (PEG) of the composite membrane show a good responsiveness with changing the temperature. The study provides an easily available, flexible and effective method for the design and preparation of a temperature-responsive membrane with tunable responsive behavior to satisfy various applications.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 19
·期 6
·1571-1578
·
IF 2.446
Zhao Jia,Ma Yanhui,Hou Xiaodong,Li Liqing,Zheng Peifeng,Li Chunya
A novel 1-[3-(tert-butoxycarbonylamino)propyl]-3-[3-(N-pyrrole)propyl]imidazolium tetrafluoroborate ionic liquid was successfully synthesized and was used as functional monomer to electrochemically fabricate a polymer film modified glassy carbon electrode (Poly-IL/GCE). Morphology and the interfacial property of Poly-IL/GCE were examined with scanning electron microscope and electrochemical impedance spectroscopy, respectively. Bisphenol A (BPA) was chosen as a model compound to investigate the sensing performance of Poly-IL/GCE using voltammetry. The oxidation peak currents of BPA at the Poly-IL/GCE exhibit a linear response to its concentration in the range of 1.0 × 10 –8 –1.0 × 10 –5 M. The detection limit is calculated to be 4.0 × 10 –9 M (S/N = 3). The Poly-IL/GCE was successfully applied to analysis BPA leaching from drinking water bottle. The results are consistent with that of high-performance liquid chromatography.
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高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 32
·6424-6429
·
IF 3.879
Sanying Li,Wei Wang,Lei Liu,Jinxiang Dong
Protic ionic liquids (PILs) are a subset of ionic liquids, which are cost-effective and easily produced through the combination of a Brønsted acid and a Brønsted base. In this work, we have taken an organic amine, triethylenetetramine (TETA), as an example to form a PIL with acetic acid, and described the ionothermal synthesis of zinc phosphate in a PIL for the first time. Two crystalline zinc phosphate materials, ZnPO–TETA1 and ZnPO–TETA2, were successfully produced by using this PIL as the solvent and template. Powder X-ray diffraction, SEM, TGA and CHN analysis were used to characterize the two materials. The two crystalline solids are very similar to two known zinc phosphates. ZnPO–TETA1 has an open-framework and ZnPO–TETA2 has a ladder structure, and the TETA cation was incorporated into their final structure to balance the framework negative charge. It was found that the P/Zn ratio is crucial to the phase selectivity in a protic ionic liquid. Low P/Zn ratios favor the structure with higher dimensions and high P/Zn ratios tend to form the lower dimensional structures.
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高影响因子
危险品化学品经营许可证（带存储）