MOLECULES
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2013
·Vol. 18
·期 11
·13910-13919
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IF 2.428
Wen-Jian Xia,Zong-Bo Xie,Guo-Fang Jiang,Zhang-Gao Le
An environmentally-friendly, enzyme-promoted procedure for the Henry reaction was first studied using water-in-[Bmim][PF6] microemulsions as reaction medium. The Amano acylase fromAspergillus oryzaeshowed better catalytic activity for the addition reactions of nitromethane with a series of aromatic aldehydes, and a highest yield of 90% was obtained.Keywords:Henry reaction;acylase;water-in-[Bmim][PF6] microemulsion;enzyme promiscuity
研究领域:
生物化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2025
·
IF 4
Zhang Chengpeng,Bei Pengzhi,Liu Hongjing,Zhao Xu,Shi Meiling,Jing Xiaochun,Li Zhao,Yao Hui
A novel porous liquid, M2070-UiO-66-OH@[BMim][PF 6 ], has been synthesized using zirconium-based metal–organic framework (UiO-66-OH), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMim][PF 6 ]) and polyetheramine M2070. To enhance the CO 2 separation performance, M2070-UiO-66-OH@[BMim][PF 6 ] was incorporated as a filler into a mixed matrix membrane (MMM) using polyether block amide (Pebax-1657) as the membrane matrix. The properties of the synthesized M2070-UiO-66-OH@[BMim][PF 6 ] and the resulting MMMs have been characterized through FTIR, TGA, DSC, and SEM analyses. The results of porous liquid stability revealed that grafting polyetheramine M2070 onto the surface of UiO-66-OH@[BMim][PF 6 ] significantly increased the steric hindrance, thereby preventing agglomeration within the membrane. Additionally, the functional groups (amino and ether) present in M2070-UiO-66-OH@[BMim][PF 6 ] contributed to an increased number of active sites for CO 2 adsorption, facilitating enhanced CO 2 transport through the membrane. Compared to the Pebax membrane, the MMM containing 3% M2070-UiO-66-OH@[BMim][PF 6 ] exhibited significantly improved CO 2 permeability of 104.07 Barrer (an increase of 73.22%) and CO 2 /N 2 selectivity of 92.37 (an increase of 148.95%) at 30 °C and 0.3 MPa, surpassing the 2008 Robeson upper bound. These findings suggest that M2070-UiO-66-OH@[BMim][PF 6 ] is a highly promising additive for the fabrication of mixed matrix membranes with superior CO 2 separation performance. Graphical abstract A porous liquid, (M2070-UiO-66-OH@[BMim][PF 6 ]) has been prepared using UiO-66-OH@[BMim][PF 6 ] as the core and polyetheramine M2070 as the canopy. Afterwards, M2070-UiO-66-OH@[BMim][PF 6 ] has been added to the Pebax matrix to prepare M2070-UiO-66-OH@[BMim][PF 6 ]/Pebax mixed matrix membranes, which have been subjected to gas separation studies.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2019
·Vol. 304
·期 4
·1800791
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IF 3.038
Haiyan Li,Yingjie Ma,Yexiang Cui,Zhike Li,Huaiyuan Wang
Multilayer wall microcapsules efficiently loaded with a lubricant (ionic liquid [BMIm]PF 6 ) are successfully synthesized via a combination of interfacial and in situ polymerization reactions based on lignin nanoparticle–stabilized Pickering emulsion templates. The resulting microcapsules are spherical in shape, with an ideal structure of a rough outer surface and a smooth inner surface. The mean diameter and wall thickness of the resultant microcapsules are 52 ± 18 µm and 3–6 µm. The core fraction is ≈71.29 wt%. Compared with the pure epoxy resin, the friction coefficient of self-lubricating composites decreases by 83.6% (from 0.55 to 0.09) and the wear rate decreases by 218 times (from 76.8 × 10 −14 to 0.352 × 10 −14 m 3 N −1 m −1 ) by incorporating 20 wt% of the resultant microcapsules into the epoxy resin. It is demonstrated that [BMIm]PF 6 , a more efficient lubricant, release from the microcapsules during the friction process produced a boundary lubricating film. The bipolar property of [BMIm]PF 6 makes the lubricating film firmer, which can efficiently prevent direct contact between the resin matrix and counterface. Furthermore, the rough poly(urea-formaldehyde) outer surface of multilayer microcapsules brings in an improved interface property between the microcapsules and resin matrix.
研究领域:
材料科学
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化学工程
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yingjie Ma,Zhike Li,Huaiyuan Wang,Haiyan Li
Polyurethane (PU) microcapsules containing [BMIm]PF 6 as a lubricant have been fabricated by interfacial polymerization. The stabilizing effect of 10 kinds of emulsifiers towards [BMIm]PF 6 ionic liquid have been delineated. A Pickering emulsion stabilized by lignin showed the best emulsification effect on highly viscous [BMIm]PF 6 . The types and reactivities of monomers have an important influence on the formation of microcapsules. Three kinds of isocyanate (IPDI, MDI, TDI) were reacted with diamines or diols to prepare the PU microcapsules in this work. The optiaml [BMIm]PF 6 @PU microcapsules were obtained when using IPDI and TETA as monomers , under conditions of 5,000 rpm emulsifying rate, 0.5 wt% concentration of lignin Pickering emulsion , and a 3:1 mass ratio of [BMIm]PF 6 /IPDI. The synthesized microcapsules have a regular and compact spherical structure, smooth outer, and inner surfaces with a mean diameter of 43 ± 15 µm, and a thickness of 3.8 µm. The core content of [BMIm]PF 6 @PU microcapsules was determined as >70%, and the initial decomposition temperature was 300 °C. The [BMIm]PF 6 ionic liquid shown excellent lubricating property, ultralow friction coefficient (decreased by 72.7%) and wear rate (decreased by 160 times) were obtained by embedding 30 wt% microcapsules into epoxy compared with pure epoxy.
研究领域:
材料科学
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化学工程
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高分子化学
·
润滑技术
✓ 已验证
DOI
高影响因子
Soft Matter
·
2023
·Vol. 19
·期 25
·4651-4659
·
IF 3.4
Xi Zhao,Jiani Peng,Liangliang Shi,Guoxiang Wang,Yong Gao
The preparation of mixed-shell polymeric nanoparticles (MSPNs) and their stabilized non-aqueous Pickering emulsions was described in this study. Poly(methyl methacrylate)–poly(4-vinylpyridine) (PMMA–P4VP) diblock copolymer nanoparticles with different morphologies including spheres, worms and vesicles were first prepared via reversible addition-fragmentation chain transfer-based polymerization induced self-assembly in toluene. C18 alkyl chains were subsequently grafted onto the surfaces of the as-prepared PMMA–P4VP nanoparticles, affording C18/PMMA–P4VP MSPNs with P4VP blocks as the core and C18/PMMA chains as the mixed shells. MSPNs were utilized as Pickering emulsifiers to prepare non-aqueous Pickering emulsions, where [Bmim][PF6] and toluene oils were selected. Two kinds of different Pickering emulsions, [Bmim][PF6]-in-toluene and toluene-in-[Bmim][PF6], could be formed, depending on the initial location of MSPNs. However, neither of them could be generated when PMMA–P4VP diblock copolymer nanoparticles were adopted as Pickering emulsifiers, indicating MSPNs were better than diblock copolymer nanoparticle precursors in the aspect of stabilizing oil–oil interfaces. The formation mechanisms of different kinds of Pickering emulsions were unraveled in this study.
研究领域:
材料科学
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化学工程
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胶体科学
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产品关联
DOI
PubMed
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2015
·Vol. 38
·期 5
·939-946
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IF 1.997
Zeng Chaoxi,Qi Suijian,Li Zhigang,Luo Riming,Yang Bo,Wang Yonghua
A water-in-ionic liquid microemulsion ([Bmim]PF 6 /Tween20/H 2 O) was applied as reusable reaction medium to esterify phytosterols with fatty acid by Candida rugosa lipase (CRL) successfully. Two kinds of commercial CRLs, AY30 and AYS which cannot effectively catalyze esterification in conventional reaction system were found effective in the microemulsion system. Effects of reaction parameters on esterification were investigated; results showed that the conversion rate of 87.9 and 95.1 % was obtained in 24 and 48 h of reaction, respectively, under the optimized condition: the molar ratio of water to Tween 20 ( w
0 value) at 5.4, Tween 20 at a concentration of 305 mM, 50 °C,pH 7.4, 10 % of enzyme loading (w/w, with respect to total reactants), and phytosterols/lauric acid molar ratio of 1:2. Moreover, by using n-hexane as the extraction agent, the lipase-encapsulated microemulsion could be reused at least seven times (>168 h) without significant changes in the conversion rate, while achieving a purpose of simple separation and purification.
研究领域:
生物化学
·
酶工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2023
·
IF 3
Wen Deng,Chengcheng Yang,Mengting Gong,Zhaohui Zhang,Hui Li
A [BMIM]PF 6 ion liquid (IL)-assisted synthesis of a rutin imprinted monolith (RIM) was carried out in an in-situ polymerization method. Bi-functional monomers and a ternary porogen containing IL was used for the RIM preparation and a L 9 (3 3 ) orthogonal factor design performed. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR) and N 2 adsorption method was for structural characterization of the RIMs. The monolith was directly used as stationary phase in liquid chromatography to test the retention selectivity, adsorption capacity and extraction application. The optimized porogen consists of 900 μL DMF, 144 μL ACN and 216 μL IL. The monolith RIM-13 obtained under the optimized conditions possessed improved adsorption performance, with a dynamic adsorption capacity of 6.695 mg/g, an imprinting efficiency of 4.841 and a selectivity α value of 4.821. Additionally, this monolith had also higher specific surface area , pore volume and permeability than that obtained without IL and the homogeneity of the imprint sites could be improved by using IL. When the RIM-13 was applied to the separation and purification of rutin from tartary buckwheat, a rutin product with a purity higher than 92 % can be obtained by one cycle. This molecular imprint solid-phase extraction (MI-SPE) is of potency to be applied to preparative-scale separation of other natural products.
研究领域:
分析化学
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材料科学
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药物化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qingyun Zhao,Xiaohui Liu,Shuo Deng,Xianghong Zheng,Birong Zeng,Xinyu Liu,Yiting Xu,Conghui Yuan,Lizong Dai
A composited flame-retardant phosphorus-containing polyimine vitrimer films (Ionic-PIs) were synthesized by using ionic liquid BMIM∙PF 6 containing flame retardant elements N, P and F as the regulator. The effects of the addition amount of BMIM∙PF 6 on the mechanical properties, degradation, recycling, and flame retardancy were investigated. Compared to intrinsically phosphorus-containing polyimine film (PI), the composited Ionic-PIs exhibited better mechanical strength and toughness. Hydrogen bonding interactions between BMIM∙PF 6 and polyimine network greatly increased Ionic-PI’s mechanical strength at a low addition of 1 wt%, and the microphase separation caused by the aggregation of BMIM∙PF 6 drastically enhanced their toughness as the addition increased. Ionic-PIs exhibited excellent reprocessability at 85 °C and degradable recyclability under acidic conditions. In addition, due to the synergistic effect of condensed-phase and gas-phase flame-retardant mechanisms, the Ionic-PIs possessed good flame retardancy with LOI above 27 % and a UL-94 test reaching VTM-0 grade, which was important for the high-fire safety of polyimine vitrimer. This work is helpful to provide a simple and feasible strategy to modulate the comprehensive properties of cross-linked polyimine vitrimer film and to expand their applications in many fields.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 3
·597-605
·
IF 9.405
Shaoqi Yang,Xingmei Lu,Haoyu Yao,Jiayu Xin,Junli Xu,Ying Kang,Yongqing Yang,Guangming Cai,Suojiang Zhang
Selective catalytic hydrotreatment of lignin-derived phenols and dimeric ethers into alkanes is crucial for utilization of lignin and its fragments. Herein, we developed an efficient catalytic system with well-dispersed metal nanoparticles supported on SBA-15 synergistic with an ionic liquid. The catalytic system could catalyze the hydrodeoxygenation (HDO) of various monomeric and dimeric lignin-derived phenols into the corresponding alkanes under acid free conditions. The synergistic [Bmim]PF6-Ru/SBA-15 (1-butyl-3-methylimidazolium hexafluorophosphate) catalysis exhibited the best HDO activity for lignin-derived phenols and dimeric ethers with >99.0% conversion and maximum >98.0% selectivity of the corresponding alkanes. The yield of cyclohexane from diphenyl ether was 97.7% with 100% conversion under 2 MPa H2 at 130 °C for 6 h. The mechanism investigation confirmed that the Ru/SBA-15 catalyst and the anion of [Bmim]PF6 played crucial roles in the hydrogenation process and deoxidization process, respectively. The catalytic system was reused six times for HDO of diphenyl ether to test its stability.
研究领域:
化学工程
·
可再生能源
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
·
2026
·
IF 3.7
Bai Yushuai,Chen Hui,Liu Peng,Meng Xianglong,Zhang Jingjie,Yi Mingdong,Chen Zhaoqiang,Xiao Guangchun,Xu Chonghai
To enhance the dry cutting performance of YG8 cemented carbide tools, square-array pit-type micro-textures were fabricated on the tool rake face, and [BMIM]PF₆/5CB@PUF dual-core microcapsules were embedded into the micro-textures using a UV-curing filling method. This study used 300M steel as the workpiece material and employed an orthogonal experimental design to examine the effects of micro-texture parameters and microcapsule characteristics on the dry cutting performance of YG8 cemented carbide tools. The range analysis results indicate that the texture–edge distance is the dominant influencing factor, followed by microcapsule type, microcapsule content, and texture density. The best-performing cutting condition within the investigated experimental range was obtained with a texture–edge distance of 100 μm, a texture density of 20%, a microcapsule content of 20 wt.%, and a microcapsule type of [BMIM]PF₆/5CB@PUF. Compared with the untreated tool, the textured tool filled with microcapsules increased the cutting length by 12.9%, while reducing the cutting force, cutting temperature, and surface roughness by 38.35%, 29.65%, and 32.36%, respectively. EDS and XPS analyses reveal that the enhanced performance stems from the rupture of dual-core microcapsules during cutting. The subsequent continuous release of lubricants generates a stable film on the rake face, which minimizes direct tool-chip contact and friction. This improvement provides a novel strategy for achieving sustainable lubrication and enhanced efficiency in dry cutting operations.
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Yuxiu Fu,Xiaoli Song,Yaming Pang,Yinan Zheng,Liguo Gao
In this paper, a green solvent [BMIM] [PF 6 ] ionic liquid was selected for the extraction and separation of quinoline from simulated wash oil. The effects of extraction temperature, extraction time, and solvent oil ratio on the extraction of quinoline from wash oil were studied. The optimal process parameters were obtained by changing single factor conditions and optimizing the experiment using response surface methodology. When the temperature is 71 ℃, the time is 60 min, and the solvent oil ratio is 3:5, the extraction efficiency can reach 67%. The ionic liquids were recovered and their properties were investigated by infrared spectroscopy. The mechanism of quinoline extraction by ionic liquids was analyzed using infrared spectroscopy and GROMACS kinetic simulation calculations.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Lixia Yang,Yuexia Han,Zhen Jiao
To obtain the basic data for the recovery of 1-methylimidazole from wastewater by extraction, the ternary liquid–liquid phase equilibrium data of the water (1) + 1-methylimidazole (2) + 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) (3) system were determined using an equilibrium autoclave at the temperatures of 303.15 to 323.15 K and 101.32 kPa. The solute distribution coefficient (D) and the selectivity (S) of the ternary system were calculated in accordance with the experimental data. Their values were up to 1.39 and 41.17, respectively, which showed that the ionic liquid can extract 1-methylimidazole effectively. The experimental results showed that the temperature had a slight effect on the liquid–liquid equilibrium behavior. Meanwhile, the calculated results revealed that the selectivity coefficient decreased with the enhancing concentration of 1-methylimidazole in the ternary system and the increasing temperature. In addition, the nonrandom two liquid (NRTL) model was used for correlation of the ternary systems. The root-mean-square deviation value of 0.0218 indicated that the calculated results using the model were in good agreement with the experimental data and were reliable to apply to practice.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）