JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Xiaoqing Yuan,Zhiyong Li,Ying Feng,Yuanchao Pei,Huiyong Wang,Diandian Liu,Dayu Wang,Jianji Wang
At present, it is still a challenge for reversible regulation of phase behavior and microstructure of microemulsions with less energy input and no composition change of the system. Photo-responsive microemulsions provide a potential way to solve these problems. In this work, 10 kinds of photo-responsive ionic liquids (ILs) with azobenzene group were used as photo-responsive surfactants to form microemulsions with water and some alcohols. Factors affecting the phase behavior and sub-regions of microemulsions, such as chemical structure of the ILs, temperature, alcohols properties and UV irradiation , were studied by conductivity, small-angle X-ray scattering, dynamic light scattering and cryo-TEM techniques. It was found that azobenzene-based ILs with a more hydrophilic head group and a shorter alkyl spacer length were favor of the formation of the microemulsions. The phase behavior of the microemulsions only slightly changed after UV irradiation, however, the area of O/W and bi-continuous sub-regions of the microemulsion could be regulated by UV irradiation. At the same time, droplets size increased after UV light irradiation , and could be restored close to the initial value by alternative vis-light irradiation.
研究领域:
胶体与界面化学
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材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2021
·Vol. 56
·期 12
·6719-6731
·
IF 3.713
Diqiong Wang,Baokun Qi,Qingqing Xu,Shuang Zhang,Fengying Xie,Yang Li
Summary Soybean lipophilic proteins (LP) are promising emulsifiers for nanoemulsion delivery systems. We analysed the effect of common salt ions on the stability of nanoemulsion delivery systems that contained ultrasonically modified soybean LP. Moreover, explored the mechanism of influence. The LP nanoemulsions presented large absolute zeta (ζ) potentials at low salt ion concentrations, and their particle size distribution was relatively uniform. The emulsification, encapsulation efficiency and oxidation stability were superior to those of other nanoemulsions. The ultrasonically modified samples presented higher absolute ζ potentials and smaller droplet sizes than the pristine ones and formed uniform protein films at different salt ion concentrations. Therefore, ultrasonication improved the emulsification, encapsulation efficiency and oxidation stability of the emulsions, effectively improve the stability of nano-delivery systems in different salt ion environments and maximise delivery efficiency at low salt ion concentrations. These results are helpful for the development of LP nanoemulsion systems that are stable at different salt ion concentrations.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Junwang Zhang,Xinyu Zhu,Xiaoxiao Xu,Qingqin Sun,Ligang Wei,Kunlan Li,Shangru Zhai,Qingda An
The oxidative depolymerization of alkali lignin can be achieved by using Keggin structure polyoxometalate-ionic liquid (POM-IL) as catalyst under aerobic conditions . The effects of catalysts such as [HC 4 im] 3 PMo 12 O 40 , [HC 4 im] 5 PV 2 Mo 10 O 40 , [HC 2 im] 5 PV 2 Mo 10 O 40 , and [HC 4 im] 4 SiMo 12 O 40 (abbreviated as POM-IL1, POM-IL2, POM-IL3, and POM-IL4, respectively), the acidity of aqueous IL solutions on lignin conversion, and aromatic product distribution were investigated. Under optimized conditions, phenolic products (mainly m (p)-cresol, veratrole, vanillin) had the highest yield and the selectivity was as high as 75.0% using POM-IL1 as the catalyst. POM-IL2 and POM-IL3 were used as the catalysts, the highest conversion of 76.0% of lignin was achieved, and the overall yield of ketone products were higher on lignin samples, in which the main products include acetovanillone, 3-methoxyphenol, and 4-methylcatechol, and the highest selectivity of ketone products was 76.8%. The results show that the lignin fragments could be successfully oxidized into platform compounds in aqueous acidic ILs (AILs) solutions catalyzed by Keggin structure POM-IL. In addition, the role of AILs and POM-ILs in the oxidative depolymerization of alkaline lignin was analyzed, and the possible reaction mechanism between AIL-water/POM-IL/lignin system was speculated.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Faizal Soyekwo,Hui Wen,Dan Liao,Changkun Liu
Selective recovery of lithium from Salt Lake brines using environmentally friendly technologies is increasingly demanded to overcome the shortage of lithium. However, satisfying high separation precision is challenging for most polymer nanofiltration membranes. Besides, bestowing high permeance together with improved membrane fouling remains a challenge for the widespread implementation of membrane processes. Herein, a new tri-quaternary ammonium-based ionic liquid (TQAIL) electrolyte monomer is synthesized and utilized for the surface modification of nascent polyamide active layer to fabricate IL-modified polyamide nanofiltration (NF) membrane for Mg 2+ /Li + separation. Molecular dynamics simulations confirm that TQAIL modification creates nanoscale structural heterogeneity leading to enhanced surface hydrophilicity and reduces internal resistance through the membrane selective layer. The TQAIL membrane exhibits improved Li + /Mg 2+ selectivity and improved water permeability of 26.11 L m −2 h −1 bar −1 , which is fourfold that of unmodified membrane accompanied with a 100-h stable continuous nanofiltration. Moreover, the membrane displays good anti-biofouling behaviour with excellent antimicrobial properties. This study offers new insights into how surface functionalization using multication side chains can remarkably improve ion separations by molecularly tuning ion-membrane electrostatic interactions in polymeric membranes .
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Chengzhen Sun,Mei Liu,Shijing Xu,Shaohua Zhu,Jiazhong Wu,Bofeng Bai
We experimentally study the influence of inorganic salt ions on the wettability of originally oil-wet rock surfaces, formed by adsorbing polar molecules via polar interactions. It is found that the ions can alter the surface to a more water-wet state with a reduction in the water contact angle of about 20° at most. At lower concentrations, the effect of CaCl 2 solutions is more obvious than that of NaCl solutions, and Na 2 SO 4 solutions are more effective than NaCl solutions. Through a series of characterization, underlying mechanisms are revealed as: (1) the octadecylamine protonates at oil–water interface and attracts with the anions, reducing oil–water interfacial tension; (2) the cations are adsorbed on the negatively charged quartz surface, weakening the electronegativity of quartz surface and replacing the adsorbed octadecylamine molecules. Finally, a quantitative theoretical model is established based on the Young equation to predict the dependence of contact angle on the ion concentration.
研究领域:
石油工程
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Elrasheed Elhaj,Huajun Wang,Yanlong Gu
A series of functionalized quaternary ammonium salt ionic liquids (FQAILs) with different functional groups, such as hydroxyl, carboxyl, ether group, and amino, were prepared and used as a catalyst for the synthesis of glycerol carbonate from transesterification of glycerol and dimethyl carbonate without any additional organic solvent and co-catalyst. The effects of functional groups, anions (Cl − , Br − , I − , OH − ), and reaction parameters were investigated in detail. It is found that both the cation and anion of FQAILs display an important effect on its catalytic activity. Among these FQAILs, hydroxyl functionalized ionic liquid, [HPTPA]OH possesses the highest activity because there are the strong interactions between hydroxyl and dimethyl carbonate molecular and between anion OH − and glycerol molecular, which were shown by FTIR spectra. The glycerol conversion of 96.2% and glycerol carbonate yield of 87.6% can be obtained over [HPTPA]OH under moderate conditions of reaction temperature of 80 °C, reaction time of 90 min, dimethyl carbonate/glycerol molar ratio of 3, and catalyst amount of 0.9 mol% based on glycerol amount. The [HPTPA]OH catalyst can be reused at least three cycles without significant reduction in its catalytic activity. Finally, a possible reaction mechanism for the synthesis of glycerol carbonate is also proposed.
研究领域:
化学工程
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Hao Li,Liqun Wang,Nan Li,Jianmin Feng,Feng Hou,Sihui Wang,Ji Liang
Electrocatalytic nitrogen reduction reaction (eNRR) at the ambient conditions is attractive for ammonia (NH 3 ) synthesis due to its energy-efficient and eco-friendly features. However, the extremely strong N≡N triple-bonds in nitrogen molecules and the competitive hydrogen evolution reaction lead to the unsatisfactory NH 3 yield and the Faradaic efficiency (FE) of eNRR, making the development of high-performance catalysts with adequate active sites and high selectivity essential for further development of eNRR. Addressing this, we herein report a Bi and K dual-doped titanium oxide (BTO@KTO) material, which is prepared by a cation exchange reaction between K 2 Ti 4 O 9 and molten BiCl 3 , for high-performance eNRR catalysts. Benefiting from the controllable molten-salt cation exchange process, a highly active surface containing Bi/K sites and rich oxygen vacancies has been obtained on titanium oxide. Under the synergy of these two merits, an efficient eNRR catalysis, with the NH 3 yield rate of 32.02 μg h −1 mg cat. −1 and the FE of 12.71%, has been achieved, much superior to that of pristine K 2 Ti 4 O 9 . This work thus offers a high-performance electrocatalyst for eNRR, and more importantly, a versatile cation-exchange strategy for efficiently manipulating materials' functionalities.
研究领域:
材料科学
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电催化
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 3
·897-912
·
IF 2.5
Lu Qing,Wang Shougui,Ji Cailin,Chen Guanghui,Dong Jipeng,Gao Fei
Ionic liquid immobilization is an effective means for preparing metal-free heterogeneous catalysts for the CO 2 conversion. Herein, a series of quaternary ammonium ionic liquids functionalized MCM-41 heterogeneous catalysts, integrating hydrogen bond donors and nucleophilic ion sites, were prepared by a post-synthetic modification method for the CO 2 cycloaddition reaction. The physicochemical properties of the catalysts were analyzed by XRD, EA, SEM, TEM, BET, FT-IR, TGA, NMR and XPS. The results show that the quaternary ammonium ionic liquids are successfully immobilized onto the MCM-41 molecular sieves. The obtained catalysts maintain an excellent pore structure and have the good thermal stability. The effects of catalytic conditions on the catalytic performance, the recyclability of the catalysts and their generalizability to epoxide substrates were systematically investigated. In addition, the catalytic performance was evaluated for low concentrations of CO 2 (20% CO 2 , 80% N 2 ). The synergy of multifunctional active sites makes the obtained materials exhibit the high catalytic activity without metals, co-catalysts and solvents. Furthermore, a possible mechanism for the conversion of CO 2 to cyclic carbonate catalyzed by the MCM-41-N/CH 3 (1:3) was proposed.
研究领域:
化学工程
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催化科学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Bin Jiang,Shuai Hou,Luhong Zhang,Na Yang,Na Zhang,Xiaoming Xiao,Xiaodong Yang,Yongli Sun,Xiaowei Tantai
Ionic liquids (ILs) as promising absorbents for SO2 capture in flue gas desulfurization have been extensively studied. In this work, a multisite absorption strategy was used to synthesize ether-linked diamine protic ionic liquids (EDPILs) for efficient SO2 capture. The prepared EDPILs containing ether-linkage chain exhibited superior SO2 absorption relative to conventional protic ionic liquids (PILs). Density functional theory calculations demonstrated that the ether-linkage chain intensified the physical interaction between EDPILs and SO2. In a subsequent experiment, bis(2-dimethylaminoethyl) ether dilactate [BDMAEE][L]2, which possessed outstanding SO2 capture capacities, was used to prepare aqueous solutions (aq), which reduced viscosity of PILs and improved their applicability. An in-depth assessment of the desulfurization performance of [BDMAEE][L]2 aq revealed that effective SO2 absorption can be achieved even at relatively low concentrations. Specifically, 50 wt % [BDMAEE][L]2 aq exhibited a high absorption capacity (1.04 molSO2/molILs, 0.097 gSO2/gabsorbents) as well as a high SO2/CO2 selectivity at 0.2 vol % SO2 and 40 °C. Overall, ether-linked absorbents with improved desulfurization performance (high SO2 absorption capacity, satisfactory SO2 removal efficiency, and excellent reusability) possess good application prospects in flue gas desulfurization.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Jia Qiao,Fei Tao,Guokang Wei,Xiaohui Zhang,Wei Xie,Xin Li,Jianhong Yang
Aluminum ion batteries (AIBs) are currently attracting widespread interest due to their high capacity, low price and high safety, while practical applications are severely hampered by the lack of suitable cathodes and the relatively complex and divergent energy storage mechanisms. Polyaniline has shown considerable promise for application in various rechargeable batteries, however, little research has been conducted on the application to AIBs. Here, the emeraldine base polyaniline (PANI) using a chemical oxidation method is synthesized and then assembled in an Al/PANI cell with a chloroaluminate ionic liquid as the electrolyte. Compared with the conventional protonated polyaniline cathode, the PANI cathode shows better electrochemical performance during the 0–2.4 V charging/discharging process, exhibiting a discharge specific capacity of 155 mAh g -1 at a current density of 1 A g -1 and capacity retention of 80% after 2000 cycles. Meanwhile, ex-situ characterization reveals a novel conversion process of this system different from that of conventional proton-doped polyaniline materials, in which the electrolyte is spontaneously complexed with the PANI cathode. This is followed by reversible doping of the chloroaluminate anion in the –NH- group of the PANI-AlCl 3 complex, yielding high reversible capacity and long cycle life. These findings have made new attempts and laid the foundation for the development of high-performance aluminum ion batteries with conducting polymers as the cathode material and further clarification of their charge storage and reaction mechanisms.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 19
·11144
·
IF 6.208
Qiuju Chen,Min Lian,Jian Guo,Binbin Zhang,Sankui Yang,Kexin Huang,Futian Peng,Yuansong Xiao
Nitrogen is an important nutrient element that limits plant growth and yield formation, but excessive nitrogen has negative effects on plants and the environment. It is important to reveal the molecular mechanism of high NUE (nitrogen use efficiency) for breeding peach rootstock and variety with high NUE. In this study, two peach rootstocks, Shannong–1 (S) and Maotao (M), with different NUE were used as materials and treated with 0.1 mM KNO3for transcriptome sequencing together with the control group. From the results of comparison between groups, we found that the two rootstocks had different responses to KNO3, and 2151 (KCL_S vs. KCL_M), 327 (KNO3_S vs. KCL_S), 2200 (KNO3_S vs. KNO3_M) and 146 (KNO3_M vs. KCL_M) differentially expressed genes (DEGs) were identified, respectively, which included multiple transcription factor families. These DEGs were enriched in many biological processes and signal transduction pathways, including nitrogen metabolism and plant hormone signal transduction. The function ofPpNRT2.1, which showed up-regulated expression under KNO3treatment, was verified by heterologous expression in Arabidopsis. The plant height, SPAD (soil and plant analyzer development) of leaf and primary root length of the transgenic plants were increased compared with those of WT, indicating the roles ofPpNRT2.1in nitrogen metabolism. The study uncovered for the first time the different molecular regulatory pathways involved in nitrogen metabolism between two peach rootstocks and provided gene reserve for studying the molecular mechanism of nitrogen metabolism and theoretical basis for screening peach rootstock or variety with high NUE.Keywords:peach;nitrogen use efficiency;comparative transcriptomics;PpNRT2.1gene;expression pattern;nitrate ion
研究领域:
植物科学
·
分子生物学
·
基因组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2016
·Vol. 32
·期 3
·605-610
·
IF 0.844
CHEN Feng-Feng,DONG Yan,SANG Xiao-Yan,ZHOU Yan,TAO Duan-Jian
Four tetrabutylphosphonium carboxylate ionic liquids ([P4444][CA]) were prepared, and their densities, viscosities, refractive indices, and conductivities were measured and correlated with thermodynamic and empirical equations in the temperature range of 298.15-348.15 K.
The influence of temperature on these four properties of [P4444][CA] was discussed, and their thermal expansion coefficient values were calculated. The CO2 absorption capacity of [P4444][CA] was studied at 313.15 K and 100 kPa. The results indicated that [P4444][Buty]
had the highest CO2 capture capacity among these ionic liquids, with an absorption capacity of 0.4 mol·mol-1 and balance time of less than 5 min.
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）