SYNTHETIC METALS
·
2020
·
IF 3.286
Wei Wang,Di Xu,Aibin Huang,Huihui Yuan,Junjie Xie,Xinyu Chen,Yunlong He,Tao Zhang,Hujiang Shen
PEDOT films were fabricated by vapor-phase polymerization (VPP) with different inhibitor contents in oxidant-containing solutions, and were characterized by X-ray diffraction, Raman spectroscopy, UV/vis transmittance spectra, atomic force microscopy, electrical conductivity and electrochromic measurements. The imidazole which serves as an inhibitor plays key roles on the polymerization reaction, and varying its content results in drastically different properties of the PEDOT films. In the imidazole/Fe(III) p -toluenesulfonate (Im/Fe) weight ratio range of 0∼0.25, the rate of polymerization can be significantly slowed down by increasing the Im/Fe ratio. The optimum Im/Fe ratio of 0.1 and polymerization time of 3 h results in PEDOT films with the highest conductivity on glass substrate (626 S/cm). Higher doping level is found in PEDOT films fabricated with the Im/Fe ratio above 0.1, causing low conductivity due to their loose morphology. The electrochromic properties of the films can be enhanced by prolonging the polymerization time to 3 h. It is found that the transmittance difference at 550 nm is above 10 % in PEDOT films fabricated with 3 h of polymerization. An electrochromic device is assembled and its coloring time is less than 3 s.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 2
·772-779
·
IF 3.288
Kuo Liu,Qingyuan Peng,Ziwei Li,Jingzhen Cheng,Li Lao,Xing Li,Zuocai Zhang,Shaorong Lu,Yuqi Li
Developing polylactic acid (PLA) shape-memory films with excellent mechanical and thermal properties is essential for applying PLA in the shape-memory materials field. In this study, a series of perylene-bisimide-functionalized graphene nanosheet (PBI–GN)/PLA shape-memory films were successfully prepared by electrospinning. The effects of PBI–GNs on the mechanical, thermal, and shape-memory properties of the PLA nanofiber films were systematically studied. Results showed that with a 9 wt% content of PBI–GNs, the thermal stability of the composite film significantly improved, and the tensile strength and elongation at break increased by 346% and 11.1%, respectively, compared with those of the neat PLA nanofiber film. Moreover, at this percentage of PBI–GNs, the composite film exhibited the maximum shape recovery of 92.3%, which was 36.3% higher than that of the neat film. After five thermomechanical test cycles, the ratio decreased by only 3.7%.
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Soft Matter
·
2020
·Vol. 17
·期 5
·1437-1444
·
IF 3.14
Huijiao Cao,Wenlin Xu,Xia Guo
Wormlike micelles (or reverse wormlike micelles) are flexible cylindrical chains that are normally formed in water (or a nonpolar organic solvent) at 25.0 °C or above; the formation of wormlike micelles at lower temperatures is rare. Here, we have reported wormlike micelles formed at low temperature using an ionic liquid surfactant (1-octadecyl-3-nonyl imidazolium bromide) in polar organic solvents (including 1,3-propanediol, 1,2-propylene glycol, N,N-dimethylformamide, and glycerol/1,2-propylene glycol mixture) in the absence of any additives. The viscoelasticity and morphology of the wormlike micelles were studied using rheology, small-angle X-ray scattering, and cryo-transmission electron microscopy. The viscoelastic properties of the wormlike micelles in polar solvents are affected by the solvent type (or the weight ratio of glycerol to 1,2-propylene glycol), surfactant concentration, and temperature. Moreover, the G′ and G′′ crossover twice in the dynamic curves, which is different from the case in water. The first crossover (at low frequency) corresponds to the relaxation time for the alkyl chains to disentangle from the transient network, and the second crossover (at high frequency) is related to the segmental motion of the chains. Furthermore, the tribological performance of these wormlike micelles is investigated at low temperature. It is found that the protective film (formed by the physical adhesion of the wormlike micelles on the surface of friction disk pair) and the tribochemical reaction together lead to good antifriction and antiwear performance, which indicates the application prospects of these wormlike micelles in low-temperature lubrication.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Tangjuan Zhao,Mengyan Zhang,Ling Ma,Li Ma,Hongmei Shi,Weijun Kang,Xiangdong Xu
A novel magnetic solid-phase extraction (MSPE) material (Fe 3 O 4 @SiO 2 -NH 2 -G2) had been prepared and employed for adsorption and analysis of seven quaternary ammonium compounds (QACs) in infant fruit and vegetable products coupled with high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS). In this paper, Fe 3 O 4 @SiO 2 -NH 2 -G2 was synthesized based on Fe 3 O 4 @SiO 2 -NH 2 and dendrimer (G2) consisting of cyanuric chloride and imidazole . The morphology, configuration and magnetic behavior of the magnetic material were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FT-IR), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). Critical parameters affecting extraction efficiency, such as the adsorbent amount, sample pH, extraction time, the type of eluent, and desorption time, were optimized. The proposed method provided good linearity with the correlation coefficients ( R 2 ) of 0.9992-0.9999, low limits of detection (LODs) (0.05-0.50 μg kg −1 ) and limits of quantitation (LOQs) (0.20-2.00 μg kg −1 ). The satisfactory method recoveries in three spiked infant fruit and vegetable products samples were between 80.12% and 101.35% with the relative standard deviations (RSDs) less than 12.04%. In summary, the established method was an effective sample preparation method and showed good prospect for the analysis of QACs in complex matrices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Chao Zhou,Chengju Sheng,Lingling Gao,Jia Guo,Peng Li,Bo Liu
The development of treatment of wound healing cannot meet clinical requirements owing to the complex bacteria-infection and inflammatory reaction. It is necessary to develop wound dressings that are fast antibacterial property, anti-inflammation and promoting cell migration and proliferation for shortening wound healing period. In this work, we first synthesized two poly(ionic liquids) (PILs): poly(1-ethyl-3-vinylimidazolium furan-2-carboxylate) (PEIF) and poly(1-butyl-3-vinylimidazolium furan-2-carboxylate) (PBIF). The PILs were then mixed with 5 wt% montmorillonite (MMT) clay and 2-furfurylamine-modified hyaluronic acid (HAF), and chemically crosslinked with four-arm maleimide-polyethylene glycol (Mal 4 PEG) to form degradable semi-inter penetrate network (semi-IPN) hydrogels. In vitro assays demonstrated that the synthesized semi-IPN hydrogels exhibited high antibacterial activities against Escherichia coli and Staphylococcus aureus due to the high antibacterial activity of PILs. Furthermore, the semi-IPN hydrogel could be quickly degraded, and the PILs exhibited high anti-inflammatory activities when they were released from degraded hydrogels. The degradation solutions of hydrogels contained glycosaminoglycan, which was beneficial to cell proliferation and migration. The in vivo anti-infection results further demonstrated that the semi-IPN hydrogels could kill S. aureus and accelerate the healing of infected wounds.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2021
·Vol. 647
·期 7
·742-750
·
IF 1.492
Shuangyu Wang,Jiaqi Liu,Peng Cheng,Zhihui Li,Dongsheng Zhang,Qiusheng Yang,Xinqiang Zhao,Yanji Wang
Preparation of hydroxylamine via hydrolysis of cyclohexanone oxime was studied over porous SiO 2 supported acid ionic liquid catalyst. The catalyst [SPIPTES]CF 3 SO 3 @SiO 2 was prepared through sol-gel method and characterized by elemental analysis, IR and TG, etc. Various parameters such as reaction temperature and time, catalyst amount were investigated systematically. The optimized reaction conditions investigated were catalyst:cyclohexanone oxime (mass ratio) 4 : 1, conducted at 60 °C for 1 h. Since the present hydrolysis reaction is controlled by thermodynamics, the conversion of cyclohexanone oxime could not be very high. However, reasonable result was achieved under the optimized reaction conditions. Cyclohexanone oxime conversion was 38.41 % and NH 2 OH yield was 37.65 %. Additionally, combining experiments with density functional theory calculations, a possible catalyst structure and reaction pathway involved protonated cyclohexanone oxime mechanism was proposed for the present hydrolysis in this study.
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Separations
·
2021
·Vol. 8
·期 2
·22
·
IF 2.777
Pei Chen,Xiaoman Li,Xuemin Yan,Minglei Tian
(1) Background: ZIF-67 is one of the most intriguing metal–organic frameworks already applied in liquid adsorption. To increase its adsorption performance, dual ionic liquids were immobilized on ZIF-67 in this research; (2) Methods: The obtained sorbent was used to adsorb aristolochic acid I (AAI) in standard solutions. Then, the sorbent was applied in solid-phase extraction to remove AAI fromFibraurea Recisa Pierreextracted solution. (3) Results: By analyzing the adsorption models, the highest adsorption capacity of immobilized sorbent (50.9 mg/g) was obtained at 25 °C within 120 min. In the SPE process, 0.02 mg of AAI was removed per gram of herbal plant, the adequate recoveries were in the range of 96.2–100.0%, and RSDs were 3.5–4.0%; (4) Conclusions: The provided experimental data revealed that ZIF-67@EIM-MIM was an excellent potential sorbent to adsorb and remove AAI from herbal plant extract, and the successful separation indicated that this sorbent could be an ideal material for the pretreatment of herbal plants containing AAI.Keywords:dual ionic liquids;metal–organic framework;aristolochic acid I;Fibraurea Recisa Pierre
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Dawei Shang,Shaojuan Zeng,Xiangping Zhang,Xiaochun Zhang,Lu Bai,Haifeng Dong
Ammonia (NH 3 ) pollution poses a serious environmental threat. Ionic liquids (ILs) are regarded as potential solvents to treat NH 3 -containing gases because of their unique properties, including tunable structures and high affinity for NH 3 molecules. In order to achieve an efficient and reversible absorption of NH 3 , a series of protic ionic liquids (PILs) with multiple active sites were designed by introducing acidic protons, as well as the Li + ion into ILs, resulting in PILs with two acidic protons on cations ([2-Mim][NTf 2 ] and [Im][NTf 2 ]), as well as dual functionalised PILs with a Lewis acidic Li + -based anion and acidic protons on cations, namely, [2-Mim][Li(NTf 2 ) 2 ] and [Eim][Li(NTf 2 ) 2 ]. The NH 3 absorption capacity of [Im][NTf 2 ] was found to be 3.46 mol NH 3 /mol IL, which is the highest among the NH 3 absorption capacities of all known nonmetallic ILs, and is ascribed to the hydrogen bonding interactions between the NH 3 and PIL molecules. Furthermore, [2-Mim][Li(NTf 2 ) 2 ] exhibited the highest NH 3 absorption capacity, with a value of 7.01 mol NH 3 /mol IL, which is about 30 times higher than that of conventional ILs. The superior NH 3 absorption performance of the dual functionalised PILs is attributed to the combination of hydrogen bonding interactions between the protons and the NH 3 molecules, and the formation of coordination complexes between the Li + -based anion and the NH 3 molecules. Moreover, the ILs studied here exhibited excellent recyclability, indicating a great potential for their use in applications involving efficient and reversible NH 3 absorption from NH 3 -containing industrial gases.
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高影响因子
AICHE JOURNAL
·
2020
·Vol. 66
·期 8
·e16253
·
IF 3.519
Yongkang Cao,Xiangping Zhang,Shaojuan Zeng,Yanrong Liu,Haifeng Dong,Chun Deng
The emerging of ionic liquids (ILs) provides an efficient and sustainable way to separate and recover NH 3 due to their unique properties. However, the solid or highly viscous ILs are not suitable for traditional scrubbing. Therefore, an effective strategy was proposed by combining the protic ILs (PILs) with acidic H and low viscous ethylene glycol (EG) to form IL-based deep eutectic solvents (DESs) for NH 3 absorption. The results indicated that these PIL-based DESs not only have fast absorption rate, but also exhibit exceptional NH 3 capacity and excellent recyclability. The highest mass capacity of 211 mg NH 3 /g DES was achieved by [Im][NO 3 ]/EG with molar ratio of 1:3, and was higher than all the reported ILs and IL-based DESs, which was originated from multiple hydrogen bonding between acidic H and hydroxyl groups of the DESs and NH 3 . This work will provide useful idea for designing IL-based solvents for NH 3 separation applications.
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ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Ran Ma,Yu Zhao,Lan Liu,Zhenyu Zhu,Bo Wang,Ying Wang,Xijie Yin,Jing Su,Youping Zhou
Information about plant photosynthetic carbon assimilation, physiology, and biochemistry is locked in the 18O/16O ratios of the individual positions of higher plants carbohydrates but is under-utilized, because of the difficulty of making these determinations. We report the extension of the wet chemistry approach we used to access the 18O/16O ratio of O-3 of glucose with a novel GC/Pyrolysis/IRMS-based method, to determine the 18O/16O ratios of O-4, O-5, and O-6. The O atoms (OH groups) at positions 1, 2, 5, and 6 of glucose were protected by acetonation (converting to 1,2;5,6-di-O-isopropylidene-glucofuranose, DAGF). The DAGF was then converted to 6-bromo-6-deoxy-1,2;3,5-di-O-isopropylidene-glucofuranose (6-bromoDAGF) with the simultaneous removal of O-6 with N-bromosuccinimide and triphenylphosphine. The DAGF was also methylated at O-3 with CH3I under the catalysis of NaH to 3-methylDAGF, which was then deacetonated to 1,2-O-isopropylidene-3-O-methyl-glucofuranose (3-methylMAGF). O-5 and O-6 were then removed as a whole from 3-methylMAGF by I2 oxidization under the catalysis of Ph3P and imidazole. Isotope mass balance was then applied to calculate the 18O/16O of O-5 and O-6 as a whole and O-6, respectively. Sampling at different stages of substrate conversion to product and applying a Rayleigh-type fractionation model were employed, when quantitative conversion of substrate was unachievable to calculate the δ18O of the converted substrate. Quantitative conversion of glucose with phenylhydrazine to phenylglucosazone also allowed for the calculation of δ18O2 by applying isotope mass balance between the two. A C4 starch-derived glucose intramolecular δ18O profile is now determined: O-3 is relatively enriched (by 12.16 mUr), O-4 is relatively depleted (by 20.40–31.11 mUr), and O-2 is marginally enriched (by 2.40 mUr) against the molecular average.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Guodong Ren,Xiaoyu Hou,Yu Kang,Rong Zhang,Min Zhang,Wen Liu,Lihong Li,Shuangyan Wei,Haojiang Wang,Bin Wang,Haipeng Diao
Herein, nitrogen-doped carbon dots (N-CDs) emitting blue fluorescence were prepared using L-tartaric acid and triethylenetetramine through a simple and quick microwave-assisted method. The synthesized N-CDs displayed excitation-dependent fluorescence behavior, and their maximum excitation and emission wavelengths were 350 and 425 nm, respectively. The obtained N-CDs, which featured excellent fluorescence properties with a high fluorescence quantum yield of 31%, were applied to detect metronidazole (MNZ), which can effectively quench the fluorescence intensity of N-CDs due to the inner filter effect. This phenomenon was used as basis to develop a label-free fluorescent method for rapid MNZ determination, with the limit of detection of 0.22 μM and corresponding linear range of 0.5–22 μM. Hence, we had established a fluorescence method for MNZ detection and applied it to detect MNZ in real samples with satisfactory results. Finally, N-CDs with superior biocompatibility were applied for cell imaging and MNZ detection by the changes in fluorescence intensity.
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ENERGY & FUELS
·
2020
·
IF 3.421
Minjie Gao,Yucui Hou,Qi Zhang,Ying Sun,Shuhang Ren,Weize Wu
In this work, we designed three kinds of functional deep eutectic solvents (DESs) to capture SO2 in simulated flue gas. The DESs were composed of imidazole (Im), 2-methylimidazole, and 2-ethylimidazole as the hydrogen-bond acceptor (HBA) and H2O as the hydrogen-bond donor (HBD). The absorption results showed that the mole absorption capacities of 2.1 vol % SO2 by the three DESs at 40 °C were all about 1 mol of SO2/mol of HBA. Im–H2O DES (nHBA/nHBD = 1:4) shows a mass absorption capacity of 0.331 g of SO2/g of DES, which is the highest value reported in the literature. The mole ratio of HBD/HBA, flow rate of flue gas, and other acid gases in flue gas did not influence the absorption capacity of SO2. The absorption capacity decreased when the temperature increased. The absorption capacity of SO2 was almost the same after absorbing and desorbing 5 times. Furthermore, the results of 1H nuclear magnetic resonance and Fourier transform infrared analyses showed that SO2 was interacted with Im by forming Im sulfite.
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危险品化学品经营许可证（带存储）