INDUSTRIAL CROPS AND PRODUCTS
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2020
·
IF 4.244
Yu Yin,Chunhui Ma,Wei Li,Sha Luo,Yushan Liu,Xueyun Wu,Zhenwei Wu,Shouxin Liu
The efficient conversion of glucose to 5-hydroxymethylfurfural (5-HMF) in ionic liquids with MoCl 3 as catalyst under microwave irradiation was demonstrated. Based on 5-HMF yield, the ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) was the best solvent. The results showed that compared to conventional oil-bath heating, microwave irradiation not only reduced the required reaction time from hours to minutes, but also improved the 5-HMF yield. Using 10 mol% of the catalyst, the 5-HMF yield reached 20.61 % at 120 °C after 2.5 h with the oil-bath. However, a 5-HMF yield of 27.66 % could be achieved within 5 min when employing 300 W microwave irradiation. Analyses by nuclear magnetic resonance spectroscopy (NMR) and high-performance liquid chromatography–mass spectrometry (HPLC-MS) demonstrated that the coordinate bond interaction between MoCl 3 /[BMIM]Cl complex and glucose promoted the isomerism of glucose and the dehydration of fructose. Microwave irradiation was also shown to accelerate the bond breaking processes in the reaction.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 3
·49702
·
IF 2.52
Ping Wang,Zhaopei Cui,Xianhai Hu,Pei Xu,Yunsheng Ding
Biodegradable polylactide (PLA) and polyvinylidene fluoride (PVDF) blends containing the copolymer of PEGMA and 1-vinyl-3-ethylimidazolium bromide (PMI) were prepared, and the effects of ionic liquid segments of PMI on the compatibility of PLA and PVDF were investigated by dielectric relaxation spectroscopy (DRS). PMI can obviously improve the compatibility of PLA and PVDF, compared with the copolymer of PEGMA and vinyl imidazole (PMV). DRS showed that the compatibility of PLA and PVDF was related to the relaxation behavior of the blends, which was identified with Maxwell-Wagner-Sillars (MWS) interfacial polarization. The ε ' of PLA/PVDF/PMI blends was much higher than that of PLA/PVDF/PMV blends in the same temperature, resulting from the stimulation of MWS interfacial polarization by the ion mobility of PMI.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Rongrong Wang,Wei Jin,Xirong Huang
In the present work, the sulfobetaine-type zwitterionic surfactant (SB- n ) was tried for the first time to construct hydrophobic ionic liquid (HIL)-based bicontinuous microemulsions . The composition-dependent phase behavior of the HIL/water (buffer)/SB- n ternary microemulsion system was determined by the method of T - γ fishlike phase diagram . It is found that the phase inversion temperature increases markedly with the increase of the alkyl chain length ( n ) of SB- n , but the surfactant efficiency changes little. The HIL greatly affects the phase behavior, depending on the ion structure. It is found that the SB-12 stabilized [C 8 mim][PF 6 ]-based microemulsion system has moderate phase inversion temperature, and moreover, its surfactant efficiency is the highest among the reported HIL-based bicontinuous microemulsions stabilized by conventional surfactants. The composition-dependent microstructure of the SB-12-stabilized [C 8 mim][PF 6 ]-based bicontinuous microemulsion was characterized by SAXS technique, and its influence on the catalytic performance of solubilized lipase was also explored. With the increase of the mass ratio of the HIL to water ( α ), the correlation length ( ξ ) changes slightly, but the microdomain size ( d ) decreases steadily. Unlike α , with the increase of the surfactant concentration ( γ ), the d changes little, but the ξ increases markedly. This abnormal change of ξ with γ should be ascribed to the interface rigidity of the microemulsion. The catalytic efficiency of lipase depends on the rigidity of the interface and its interfacial area. The above original studies not only enrich HIL-based microemulsion systems, but also provide scientific support for lipase-based green synthesis and transformation.
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高影响因子
Molecular Catalysis
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2020
·
IF 3.687
Hongbing Song,Yule Liu,Yongjie Wang,Bingxiao Feng,Xin Jin,Tingting Huang,Meng Xiao,Hengjun Gai
In this study, a series of hypercrosslinked poly(ionic liquid)s (HCPILs) formed from imidazolium tetrachloropalladate were successfully fabricated for selective hydrogenation of phenylacetylene. Its textural properties can be tuned by the different molar ratios of reactants, thereby adjusting its active sites. The synthetic HCPILs were analyzed using various characterization techniques. Due to the constraint of the microporous structure and the charge effect of ionic liquid moieties in the HCPILs, palladium nanoparticles generated from HCPILs were reduced in situ during hydrogenation of phenylacetylene and highly dispersed. Amongst which catalyst a-4 with the largest pore-volume performed the best selectivity (97.3 %) to styrene at 96 % phenylacetylene conversion under the conditions of 308 K and 1 atm H 2 pressure. Furthermore, the activity and selectivity of the catalyst did not change considerably in solvents with different polarities. Even after repeated the catalytic experiments for five times, the catalyst displayed no significant loss for activity and selectivity. This work shows industrial application potential and a developing direction in the selective hydrogenation process.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yin Hu,Ji Pan,Qi Li,Yongyuan Ren,Haojun Qi,Jiangna Guo,Zhe Sun,Feng Yan
Lithium–sulfur (Li-S) batteries with exceptional theoretical capacities and environmentally friendly characteristics have been investigated as next-generation energy storage devices. However, the dissolution and diffusion of polysulfide result in a rapid capacity degeneration, which hinders their practical application. Here, poly(ionic liquid) (PIL)-based core–shell structured nanofibers, poly(pyrrole)@poly(ionic liquid)–polyacrylonitrile (PPy@PIL–PAN), were prepared via electrospinning and followed by a surface polymerization of pyrrole. The as-prepared PPy@PIL–PAN nanofibers were implemented as a functional interlayer for Li-S batteries, and it is found that the cationic poly(ionic liquid) framework could selectively adsorb polysulfide species in the electrolytes, contributing to effective shuttle inhibition as well as stable sulfur electrochemistry. Moreover, this work sheds light on an efficient approach to improving the performance of Li-S batteries by using PIL-based functional interlayers.
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FUEL
·
2020
·
IF 5.578
Zhaoyang Qi,Ting Qiu,Hongxing Wang,Changshen Ye
Ionic Liquids (IL) has been recently immobilized into the pores of metal-organic framework materials (MOFs) to prepare heterogeneous catalyst. However, the IL@MOFs composites are generally prepared by impregnation method, which is unstable in polar solvents. So, we design a new strategy to immobilize IL, and a novel Fenton-like catalyst [mim(CH 2 ) 3 COO]FeCl 4 @UiO-66 has been prepared based on the post-synthetic ligand exchange (PSLE) between MOFs and monocarboxylic functional IL. The [mim(CH 2 ) 3 COO]FeCl 4 @UiO-66 was exploited to act as an efficient heterogeneous catalyst for dibenzothiophene (DBT) oxidation in a biphasic system using H 2 O 2 as the oxidant. Based on optimal conditions, the DBT removal efficiency reached up to 99.1%. Moreover, the heterogeneous catalyst had a good thermal and chemical stability, and the DBT removal efficiency still exhibited over 95% after 6 recycle runs. It is worth noting that the high DBT removal efficiency could be attributed to the synergistic effect between adsorptive and oxidative desulfurization, where [mim(CH 2 ) 3 COO]FeCl 4 @UiO-66 is both an adsorbent and a catalyst.
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MATERIALS & DESIGN
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2020
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IF 6.289
Hong Ruan,Qiu Zhang,Weiqiang Liao,Yuqi Li,Xiaohua Huang,Xu Xu,Shaorong Lu
Developing self-lubricating composites with excellent tribological, thermal, and mechanical properties is a key aspect to solving the wear of materials . Herein, ionic liquid functionalized graphene (ILFG) were prepared by a π-π stacking interface design strategy. Then, a range of ILFG was filled into the polyimide (PI) matrix to prepare ILFG/PI composites (IGPI), and their tribological properties were investigated with a plate-on-ring apparatus under dry sliding conditions. When the content of ILFG was 0.4 wt%, the friction coefficient and specific wear rate of IGPI decreased by 38.2% and 25% compared to pure PI, respectively. A synergistic lubrication mechanism of ionic liquid (IL) and graphene was proposed for the formation of tribofilm under dry sliding. In addition, the mechanical and thermal properties of IGPI were also significantly improved by the synergy of IL and graphene. When the content of ILFG was 0.4 wt%, the tensile strength and modulus of IGPI composites increased by 51.9% and 56.5% relative to pure PI, respectively. The decomposition temperature of 5% weight loss (T 5% ) of IGPI with 0.4 wt% ILFG could reach 581.3 °C, an increase of 52.6 °C compared to that of PI, and the glass transition temperature improved by 14 °C.
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高影响因子
ELECTROANALYSIS
·
2020
·Vol. 32
·期 8
·1772-1779
·
IF 2.544
Yifei Yang,Yue Sun,Mingzhu Jin,Ru Bai,Yutong Liu,Yingqi Wu,Wei Wang,Xuewei Feng,Siyu Li
Superoxide dismutase (SOD) plays an important role in nearly all living cells. In this study, SOD imprinted poly(ionic liquid)s (SIPILs) were prepared on the surface of the bare Au electrode modified with nano-palladium and nano-gold (Au/nPd/nAu/SIPILs). SIPILs was synthesized with 1-vinyl-3-propyl imidazole sulfonate ionic liquids as functional monomers via electrochemically mediated atom transfer radical polymerization (eATRP) catalyzed by SOD. The Au/nPd/nAu/SIPILs was examined by cyclic voltammetry (CV), scanning electron microscope (SEM), energy-dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). The Au/nPd/nAu/SIPILs was also used as an electrochemical sensor to determine SOD by differential pulse voltammetry (DPV). Under the optimal conditions, the detection range of SOD was from 1.0×10 −8 to 1.0×10 2 mg L −1 with a limit of detection of 8.90×10 −9 mg L −1 (S/N=3). Compared with other methods, the sensor based on SIPILs had the broader linear range and lower detection limit.
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 17
·9569-9580
·
IF 6.895
Ting Chen,Yanqiao Xu,Zhixiang Xie,Weihui Jiang,Lianjun Wang,Wan Jiang
CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) are competitive fluorescent materials for lighting and displays owing to their excellent photophysical properties. However, the stability and optoelectronic performance of the perovskite NCs are severely limited by the highly dynamic binding feature of the present ligand strategy. Herein, a facile approach was employed to synthesize CsPbBr3 NCs with the assistance of the ionic liquid (IL) 1-butyl-3-methylimidazolium bromide ([Bmim]Br). By strictly controlling the addition dose of [Bmim]Br (nIL/nPb = 0.125) into the reaction precursor, it is possible to obtain the desired cube-shaped and monodisperse CsPbBr3 NCs with simultaneous enhancement of the storage and irradiation stability as well as photoluminescence quantum yields (PLQYs, ∼91%). Stability tests show that the emission intensity of the parent CsPbBr3 NCs drops to 50% of its initial emission intensity after storage under an open atmosphere for 91 days, while the sample prepared with the assistance of [Bmim]Br can maintain 82% of the PL intensity. Meanwhile, the modified CsPbBr3 NCs also present superior photo-stability, and still maintain 81% of the original PL intensity after continuous illumination under an ultraviolet lamp for 24 h, but the intensity of the parent CsPbBr3 NCs reduces to 35% of the original intensity. Through the morphology, composition, and luminescence kinetics evolution of CsPbBr3 NCs, these benefits were attributed to the modulation by [Bmim]Br, which could effectively provide Br ions for the formation and growth of NCs, resulting in the reduction of surface traps. Moreover, [Bmim]Br exhibited strong interactions with NCs, and the deprotonation of oleic acid (OA) was inhibited, resulting in the effective passivation of surface defects. Finally, CsPbX3 NCs with different compositions were obtained via a facile anion exchange reaction, leading to the tunable emission in the range of 462–665 nm and a wide colour gamut (129.65% NTSC standard). This work opens a new avenue for modulating the surface properties of CsPbX3 NCs, which will create opportunities for their application in the photoelectric field.
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PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 4
·1-13
·
IF 2.426
Guo Yongliang,Cui Jinfeng,Guo Junhong,Zhang Haojun,Wang Lurong,Yang Baoping
Polystyrene (PS) with great flame retardancy has been achieved by addition of polyhedral oligomeric silsesquioxane (POSS). However, the POSS/PS composite showed easy-ignition behavior leading to fire hazard exposed. Aiming to prolong time to ignition (TTI) and improve flame retardancy simultaneously, using non-flammable modifier to decorate POSS is a facile method. Here, two kinds of POSS hybrids (POSS-ILs), denoted as POSS-EVIM and POSS-VIPSP, were synthesized by free radical copolymerization between vinyl POSS and two kinds of ionic liquid, commercial [EVIm]BF 4 and Brønsted ionic liquid, respectively. The polystyrene-based composites (POSS-ILs/PS) were prepared by incorporated POSS-ILs into polystyrene. The results of thermal gravimetric analysis test evidenced that both POSS-ILs increased char yield and decreased decomposed rate of composites. Compared with neat PS, the TTI of POSS-ILs/PS was prolonged by 26 s and 21 s, and meanwhile, the fire hazard was decreased due to reduction of peak value of heat release rate (PHRR) and smoke release rate (PSPR) in cone calorimeter test. Scanning electron microscope observed compact residue of POSS-EVIM/PS and honeycombed residual morphology of POSS-VIPSP/PS, and additionally, both of these residual char possessed higher degree of graphitization than that of PS and POSS/PS in Raman spectrum, suggesting good physical barrier for matrix from heat and oxygen. Besides, the flexural strength of both POSS-ILs/PS composites were increased compared with neat PS. Taking the results above mentioned, POSS modified by ionic liquid can be a decent candidate to prolong time to ignition, simultaneously improve fire safety and mechanical properties for polymeric materials.
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RSC Advances
·
2020
·Vol. 10
·期 4
·2085-2095
·
IF 3.119
Bingyan Yin,Wenqing Xu,Chengjun Liu,Miqiu Kong,Yadong Lv,Yajiang Huang,Qi Yang,Guangxian Li
Poly(ionic liquid) (PIL), integrating the characteristics of both polymers and ionic liquid, is synthesized and employed to modify diglycidyl-4,5-epoxy-cyclohexane-1,2-dicarboxylate (TDE-85). With the addition of PIL, the fracture toughness, and thermal and dielectric performances of TDE-85 were discovered to be simultaneously improved, meanwhile the tensile modulus and strength is increased. Upon an optimal loading of 3 wt% PIL, the critical stress intensity factor (KIC), tensile modulus and strength are raised by 92.9%, 13.3% and 10.7%, respectively. Multi-toughening mechanisms due to spherical domains of PIL formed in TDE-85 during curing are responsible for the improved toughness. Moreover, the dielectric and thermal properties of TDE-85 are also enhanced by adding PIL. With the optimal addition of 5 wt% PIL, the dielectric constant of the composites is enhanced by 62.5%, the glass transition temperature is increased by 16.58 °C and the residual weight of carbon is increased by 59%.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yahui Meng,Huize Luo,Cuihua Dong,Chunliang Zhang,Zhibin He,Zhu Long,Ruitao Cha
Simple, fast, and accurate detection of food freshness is of considerable significance to ensure food safety. The pH values of foods can be good indicators of their freshness, which can be used for real-time detection of food quality. Herein, we fabricated a pH-sensing film for flexible smart labels based on hydroxypropyl guar (HPG), cellulose nanocrystal (CNC), 1-butyl-3-methylimidazolium chloride (BmimCl), a kind of ionic liquid (IL), and anthocyanin (Anth). We investigated the structure, optical properties, and mechanical strength of the composite films. These films can be used to detect ammonia (NH3) generated from seafood during storage by pH-sensing capability and monitor the real-time freshness of seafood. The HPG/CNC/IL/Anth film exhibited several advantages, such as wide color-change range, easy identification, high sensitivity, good reversibility, excellent stability, and low detection limit. The pH-sensing films can function as flexible smart labels for real-time, visual, and accurate detection of food freshness in cold chain logistics and other fields.
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危险品化学品经营许可证（带存储）