POLYMER
·
2023
·
IF 4.6
Zhike Li,Anyu Luo,Rui Zhou,Xin Li,Haiyan Li
A novel high temperature resistance ionic liquid@SiO 2 (IL@SiO 2 ) nanocapsules were successfully prepared in order to meet the high temperature processing requirement. The average diameter and the loading capacity of as-obtained IL@SiO 2 nanocapsules were about 420 nm and 44.7 wt% respectively. The IL@SiO 2 nanocapsules showed excellent thermal stability with a 340 °C initial thermal degradation temperature. The frictional and wear properties of PA6 composites containing IL@SiO 2 nanocapsules under different friction temperature were studied systemically. Self-lubricating PA6 composites with 3 wt% IL@SiO 2 nanocapsules showed the optical tribological propertied. The corresponding friction coefficient of PA6 composites reduced by 38.9%, and the wear rate also showed a 60.7% decrease compared with pure PA6. Unlike most microcapsules, the addition of nanocapsuels did not cause an undesirable and obvious decrease in mechanical properties of PA6. Anti-wear and friction-reduction mechanism were depth analyzed, and results revealed that IL core and SiO 2 wall in nanocapsules synergistically contribute to improve self-lubricating performance of PA6 composites.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yunlong Yu,Zhiyan Ma,Xiaoya Miao,Yanyu Cui,Yaping Song,Sen Liu,Teng Fei,Tong Zhang
Low humidity detection has been a great challenge in the field of humidity sensing. In recent years, polyelectrolytes have been proven to be promising materials for highly sensitive humidity sensors . In this work, cross-linked poly(ionic liquid)s (PILs) were prepared for low humidity detection. The strong hydrophilicity of PILs contributes to humidity sensing while the cross-linked structure guarantees the stability of the sensing film. The optimized sensor shows high response (48.0) in 5–35% RH, with short response/recovery time (1 s/10 s) and a small humidity hysteresis (0.2% RH). The possible sensing mechanism of the sensors was discussed.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yu Ding,Guosheng Ai,Jinliang Du,Guangming Yu,Lu Lai,Xuemin Yan,Weichu Yu,Yuanzhu Mi
Currently, widely-used demulsifiers are primarily produced using ethylene oxide and propylene oxide as raw ingredients. The production process is hazardous and complicated, and the demulsification temperature for crude oil emulsions is typically above 60 ℃. In this work, an efficient Gemini ionic liquid demulsifier (Y12) with dual cationic active centers was prepared using a one-pot synthesis route. The structure of demulsifiers was analyzed by FTIR and 1 H NMR spectroscopy. The bottle test was utilized to assess the demulsification performance. The results revealed that the demulsification efficiency (DE) of Y12 could achieve 100 % at a concentration of 400 mg/L under 50 ℃ for 120 min. Emulsion with different oil content were treated with Y12 at different temperatures, the DE of C30 and C70 emulsions reached 100% at temperature of 50 ℃ and 70 ℃, respectively. Furthermore, Y12 exhibited effectiveness across a wide range of pH value and high salinity conditions. To further confirm the demulsification of Y12, some commercial demulsifiers were used for comparison. It was observed that Y12 had better performance than commercial demulsifiers, indicating its promising potential for applications. The demulsification mechanism was investigated through relative solubility numbers (RSN), interfacial tension (IFT), three-phase contact angle (TCA), zeta potential, and coalescence time of water droplets (CTW). Especially, to further investigate the demulsification mechanism of Y12 demulsifier, Y8 and Y16 with different lengths of hydrophobic chains were also prepared and used for comparison. Y12 had an excellent interfacial activity and strong capability of reducing interfacial tension, which facilitates the formation of an unstable composition interfacial film and results in the oil–water separation.
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CORROSION SCIENCE
·
2023
·
IF 8.3
Feng-Ting Li,Zhi-Kun Wang,Yi Zhou,Li-Zhi Li,Yue-Qi Liu,Li Wang,Chun-Ling Li,Hua-Feng Zhu,Shuang-Qing Sun,Song-Qing Hu
Chemical modification is effective in improving the corrosion inhibition efficiency of carbon dots (CDs) on steel. Here, the imidazolium ionic liquids (IL) modified-CDs (IL-CDs) are synthesized and proved to be mixed-type corrosion inhibitors . The IL increases the pyrrole N content and facilitates the formation of a denser inhibitor film. Molecular simulations confirm that the IL reduces the π-π interaction between CDs, endowing IL-CDs with higher water solubility and better corrosion inhibition effect than CDs. The lower orbital energy gap and larger positive electrostatic potential distribution enable the inhibition efficiency of IL-CDs of 97.11% in 1 M HCl, much superior to CDs (90.80%).
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Bingbing Yang,Lu Bai,Tingting Li,Liyuan Deng,Lei Liu,Shaojuan Zeng,Jiuli Han,Xiangping Zhang
Efficient separation and recovery of ammonia (NH 3 ) is essential for environmental protection and resource utilization. In this work, hybrid membranes for NH 3 separation through multiple-site interaction were developed by combining the unique features of ionic liquids (ILs) and a midblock-sulfonated block copolymer . The functionalized ILs ([2-Mim][NTf 2 ] and [Im][NTf 2 ]) with ammonia interaction sites were incorporated into the Nexar™ matrix, which greatly improves the affinity for NH 3 over nitrogen (N 2 ) and hydrogen (H 2 ). Benefited from the self-assembly of the block copolymer, the hybrid membranes primarily exhibit lamellar morphology. More continuous ionic domains with well-distributed ILs were formed in the hybrid membranes, contributing to forming interconnected channels for enhanced gas transport. In this case, addition of the ILs into the Nexar matrix significantly enhances NH 3 separation performance. Nexar/[Im][NTf 2 ]-25 membrane achieves the highest NH 3 permeability of 3565 Barrer and a maximum NH 3 /N 2 and NH 3 /H 2 ideal selectivity of 1865 and 364, respectively. The significantly enhanced NH 3 permeation compared with the neat Nexar membrane indicates the positive role of ILs in the hybrid membranes.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ping Li,Jia Chen,Shaokun Tang
Covalent organic frameworks (COFs) hold great potential for proton-conducting materials due to the intrinsic pore channels and high surface areas. However, their limited functional groups and poor film-forming properties remain significant challenge. Silk nanofibrils (SNFs) have good mechanical property and abundant functional groups, which can be exfoliated from natural bombyx mori silks. Herein, we demonstrate a novel strategy of utilizing the flexibility of SNFs to assemble conductive COFs into a stable membrane form. Ionic liquids (ILs)-impregnated sulfonic acid-based COF (IL-COF-SO 3 H) is prepared and then is combined with SNF to fabricate IL-impregnated COF/SNF composite membrane. The uniformly distributed ILs inside COF-SO 3 H increase the number of proton hopping sites. Meanwhile, the –SO 3 H groups can form strong interactions with imidazole-type ILs and immobilize ILs within the channels, endowing COF-SO 3 H pores low-barrier proton transfer pathways. Additionally, the hydrogen-bonding interactions between IL-COF-SO 3 H and SNFs enable interfacial binding and structure stability, as well as facilitate proton transfer. Thus, the resultant IL-COF-SO 3 H@SNF composite membrane simultaneously obtains enhanced conductivity (224 mS cm −1 at 90 °C and 100% RH) and mechanical performance (tensile strength of 28.6 MPa). This study provides novel insight into fabrication of stable COF-based membrane for high-performance conduction materials.
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MACROMOLECULES
·
2021
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IF 5.985
Xiaoliang Yu,Zhengyi Xia,Tengda Zhao,Xiaoyan Yuan,Lixia Ren
Organic magnets are promising in quantum computers, spintronic devices, and information storages for their excellent processing and smart design abilities, resulting from the organic part. However, the organic part shields the magnetic centers to weaken the magnetic interaction. In this work, π–π stacking planar pyrene groups are introduced into cations of a magnetic ionic liquid (NBPBI[FeCl4]) and poly(ionic liquid) (PNBPBI[FeCl4]) with FeCl4– as the anions. By introducing pyrene groups, the shortest distance between neighboring magnetic units is within 4 Å. The ferromagnetic interactions in NBPBI[FeCl4] and PNBPBI[FeCl4] are enhanced by the π–π stacking pyrene groups. Moreover, the corresponding organic magnets are soft ferromagnets, as phase transition from paramagnetism to ferromagnetism is observed from zero field cooling and field cooling tests at the low temperature. This is a new strategy for designing a ferromagnetic organic magnet.
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JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2021
·Vol. 59
·期 4
·388-395
·
IF 1.618
Ma Xiaofei,Li Jingtang,Li Xiaoqi,Feng Zijie,Yang Xuan,Liu Jie,Du Yingxiang
Nowadays, ionic liquids (ILs) functionalized cyclodextrins (CDs) have drawn increasing attention in chiral separation. Herein, a novel β-CD derivative functionalized by L-histidinium IL, mono-6-deoxy-6-L-histidinium-β-cyclodextrin chloride (L-HMCDCl), was synthesized for the first time and utilized for enantioseparation of nefopam and chlorphenamine in capillary electrophoresis. The L-HMCDCl exhibited superior enantioselectivity compared with native β-CD. The effect of some key parameters such as chiral selector concentration, buffer pH and applied voltage on the enantioseparation was investigated in detail. In the interest of the chiral discrimination mechanism and the enhanced enantioselectivity of L-HMCDCl, molecular modeling with AutoDock was employed to study the interaction, which was in good agreement with experimental results.
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PubMed
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Lijun Zhang,Nan Wang,Pengfei Cao,Meng Lin,Ling Xu,Houyi Ma
Cobalt-based metal-organic framework (Co-MOF) and MOF-derived cobalt hydroxide (Co(OH) 2 ) were successfully prepared by ionothermal and one-pot conversion methods, respectively. The introduction of ionic liquid in the synthesis of MOF could enhance electrical conductivity, thereby improving its electrocatalytic performance. The morphologies and structural compositions were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). Cyclic voltammetry (CV) and amperometry investigation showed that the Co-MOF displayed higher electrochemical sensing performance toward glucose as compared to the Co(OH) 2 . The Co-MOF modified electrode offered a wide linear range (from 5 μM to 900 μM) and a low detection limit of 1.6 μM (S/N = 3). The electrochemical glucose sensor also exhibited excellent stability, reproducibility and selectivity. The MOFs impregnated with ionic liquids probably are capable of overcoming the disadvantage of the traditional MOFs, and the effective electrochemical property of the ionic liquid incorporated Co-MOF for the sensing of glucose can provide a direction for the bioactive molecules determination.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 50
·505402
·
IF 3.551
Hao Ying,Chenyun Zhang,Tingting Chen,Xiaoning Zhao,Zhonghao Li,Jingcheng Hao
The electrochemical hydrogen evolution reaction (HER) is a promising strategy for production of hydrogen; however, it is still restricted by appropriate efficient and low-cost electrocatalysts. Herein, for the first time, the n-octylammonium hypophosphite, a kind of protic ionic liquid (IL), was used as a new phosphorus source for the manufacture of nickel metaphosphate (Ni2P4O12) electrocatalysts. In contrast to traditional multi-step fabrication processes, the n-octylammonium hypophosphite acted as both reactant and solvent to synthesize Ni2P4O12 by a one-step calcination approach. The obtained Ni2P4O12 as an alkaline HER catalyst required a low overpotential of 116 mV at −10 mA cm−2 and a small Tafel slope of 97 mV dec−1, comparable to the majority of reported Ni-based materials and other phosphate catalysts. Furthermore, this catalyst exhibited robust stability with no distinct attenuation of current density after a long-term durability test in 1 M KOH. Therefore, this task-specific IL strategy with a simple reaction system, reducing the occurrence of side reactions, provided a new perspective on design of high-efficiency metaphosphate electrocatalysts.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Qiu Zhao,Gang Wang,Fuxia Liao,Yifan Sha,Fei Xu,Chunshan Li,Zengxi Li,Yijun Cao
An ionic liquid (IL) catalyzed solvent-free process was developed for the direct synthesis of chalcone and its derivatives by using substituted acetophenones and benzaldehydes via aldol reaction under mild conditions. A series of acidic and basic ILs were selected and screened. The influences of cations and reaction conditions on product yield and selectivity were systematically investigated. The [Bmim]OH was identified as the optimal IL, with the highest yield and selectivity reaching up to 96.7% and 100%, respectively. A reaction mechanism-based kinetic model was established and regressed with experimental data, revealing the β -Hydroxylketone dehydrolysis with activation barrier of 37.8 kJ·mol −1 was observed as the rate-controlling step.
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ChemSusChem
·
2020
·Vol. 13
·期 18
·4900-4905
·
IF 7.962
Yingliang Yang,Hongshuai Gao,Jiaqi Feng,Shaojuan Zeng,Lei Liu,Licheng Liu,Baozeng Ren,Tao Li,Suojiang Zhang,Xiangping Zhang
Graphical CO 2 electroreduction : An aprotic aromatic ester-functionalized ionic liquid (IL), [TEA][4-MF-PhO], is designed for CO 2 electroreduction to oxalic acid. The multiple active sites exhibit excellent catalytic performance with high current density and faradaic efficiency by interacting with CO 2 . This study provides a promising prospect for using IL as electrolyte to develop efficient electrocatalysts. Electrochemical reduction of CO 2 into valuable chemicals is a significant route to utilize CO 2 resources. Among various electroreduction products, oxalic acid (H 2 C 2 O 4 ) is an important chemical for pharmaceuticals, rare earth extraction, and metal processing. Here, an aprotic aromatic ester-functionalized ionic liquid (IL), 4-(methoxycarbonyl) phenol tetraethylammonium ([TEA][4-MF-PhO]), was designed as an electrolyte for CO 2 electroreduction into oxalic acid. It exhibited a large oxalic acid partial current density of 9.03 mA cm −2 with a faradaic efficiency (FE) of 86 % at −2.6 V (vs. Ag/Ag + ), and the oxalic acid formation rate was as high as 168.4 μmol cm −2 h −1 , which is the highest reported value to date. Moreover, the results of density functional theory calculations demonstrated that CO 2 was efficiently activated to a −COOH intermediate by bis-active sites of the aromatic ester anion via the formation of a [4-MF-PhO-COOH] − adduct, which finally dimerized into oxalic acid.
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