ACTA PHYSICO-CHIMICA SINICA
·
2013
·Vol. 29
·期 10
·2157-2161
·
IF 0.869
LI Chang-Ping,LI Zhuo,ZOU Ben-Xue,LIU Qing-Shan,LIU Xiao-Xia
The density, viscosity, and conductivity of protic ionic liquid (PIL) N,N-dimethylethanolammonium propionate (DMEOAP) were determined in the temperature range of 283.15-333.15 K. The influence of temperature on density, viscosity, and conductivity is discussed. The thermal expansion
coefficient, molecular volume, standard molar entropy, and lattice energy of DMEOAP were calculated using empirical and semiempirical equations. The molar conductivity of DMEOAP was determined fromdensity and conductivity data. The temperature dependence of viscosity and conductivity data
was fitted using the Vogel-Fulcher-Tammann (VFT) equation. The relationship between molar conductivity and viscosity was determined by the Walden rule.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Danke Chen,Wen Ying,Yi Guo,Yulong Ying,Xinsheng Peng
Two-dimensional (2D) materials-based membranes show great potential for gas separation. Herein an ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), was confined in the 2D channels of MoS2-laminated membranes via an infiltration process. Compared with the corresponding bulk [BMIM][BF4], nanoconfined [BMIM][BF4] shows an obvious incremental increase in freezing point and a shift of vibration bands. The resulting MoS2-supported ionic liquid membrane (MoS2 SILM) exhibits excellent CO2 separation performance with high CO2 permeance (47.88 GPU) and superb selectivity for CO2/N2 (131.42), CO2/CH4 (43.52), and CO2/H2 (14.95), which is much better than that of neat [BMIM][BF4] and [BMIM][BF4]-based membranes. The outstanding performance of MoS2 SILMs is attributed to the nanoconfined [BMIM][BF4], which enables fast transport of CO2. Long-term operation also reveals the durability and stability of the prepared MoS2 SILMs. The method of confining ILs in the 2D nanochannels of 2D materials may pave a new way for CO2 capture and separation.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 8
·1609-1621
·
IF 7.779
Weizheng Li,Qiang Gao,Ming Shen,Bingyu Li,Chuanli Ren,Jun Yang
N-Doped mesoporous hollow carbon spheres (MHCSs) with different inner structures have attracted increasing attention in energy storage devices due to their low density and high electrical conductivity. Herein, vesicles formed by the molecular self-assembly of the ionic liquid surfactant derived from its unique properties (e.g. lower charge density and π–π interaction between the polar heads) are employed as soft templates to synthesize two kinds of uniform MHCSs (e.g. mesoporous hollow carbon spheres and core–shell structured carbon nanospheres) with high nitrogen (N) doping and various inner layouts including hollow, yolk–shell and Momordica grosvenori-like structures. The elaborate tailoring in the architectures of full sized MHCSs (55 nm–2 μm) endows them with welcome features as electrode materials for symmetrical supercapacitors. In particular, the representative sample of as-prepared N-doped MHCSs exhibits excellent electric double-layer capacitor performance with an electrochemical specific capacitance (308 F g−1 at 0.2 A g−1), superb capacitance retentions (233 F g−1 at 20 A g−1 and 174 F g−1 at 100 A g−1), and high cycling stability (85% capacitance retention at 10 A g−1 after 5000 cycles) in a 6 M KOH electrolyte. The full-sized carbon spheres with tunable architectures are expected to find more applications in catalysis, adsorption, biomedicine and energy storage and conversion devices.
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Min Wang,Qi Wang,Yuqi Geng,Ning Wang,Yanzhao Yang
In this paper, a novel ionic liquid ([ACh][Tf 2 N]) was synthesized and applied for gold separation from secondary resources, which can be employed as both hydrophobic phase and extractant in the extraction process. By modulating various parameters, the extraction behavior of gold(III) under various conditions was investigated. The result shows that it is more suitable for gold(III) extraction with high salinity and lower acidity, whereas the extraction efficiency can reach 98.98% in 5 min. The anion exchange mechanism between [ACh][Tf 2 N] and gold(III) was proved by UV–vis, FT-IR, 13 C NMR and quantum chemical calculations . The gold(III) in organic phase was easily stripped by 1 mL 0.05 M CS(NH 2 ) 2 /0.1 M HCl. [ACh][Tf 2 N] also possesses excellent selectivity for gold(III) in the mixed metal solutions. Furthermore, its operating conditions combination: ionic liquid dosage, the concentration of HCl and NaCl were optimized to 0.55 g, 0.5 M and 2.5 M by response surface methodology (RSM), respectively. Hence, the [ACh][Tf 2 N] was regarded as a potential extractant for gold recovery from secondary resources.
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ULTRASONICS SONOCHEMISTRY
·
2017
·
IF 4.218
Xiaojie Yu,Xinjie Bao,Cunshan Zhou,Lei Zhang,Abu El-Gasim A. Yagoub,Hongpeng Yang,Haile Ma
The purpose of this paper was to investigate the effect of ultrasound-ionic liquid (IL) pretreatment on the enzymatic and acid hydrolysis of the sugarcane bagasse and wheat straw. The lignocellulosic biomass was dissociated in ILs ([Bmim]Cl and [Bmim]AOC) aided by ultrasound waves. Sonication was performed at different frequencies (20, 28, 35, 40, and 50 kHz), a power of 100 W, a time of 30 min and a temperature of 80 °C. The changes in the structure and crystallinity of the cellulose were studied by Fourier transform infrared (FT-IR), X-ray diffraction (XRD) and thermal gravimetric analysis (TGA). The amounts of the total reducing sugars, glucose, cellobiose, xylose and arabinose in the hydrolysates were determined. The results of FT-IR, XRD and TGA revealed that the structure of cellulose of both biomass samples remained intact after the pretreatment, but the crystallinity decreased. The enzymatic and acid hydrolysis of the biomass samples pretreated with the ultrasound-IL result in higher yields of the reducing sugars compared with the IL-pretreated sample. Enzymatic hydrolysis of bagasse and wheat straw pretreated with [Bmim]Cl-ultrasound resulted in maximal yields of glucose at 20 kHz (40.32% and 53.17%) and acid hydrolysis resulted in maximal yields of glucose at 40 kHz (33.32% and 48.07%). Enzymatic hydrolysis of bagasse and wheat straw pretreated with [Bmim]OAc-ultrasound show maximal yields of glucose at 28 kHz and acid hydrolysis at 50 kHz. Combination of ultrasound with [Bmim]OAc is more effective than [Bmim]Cl in terms of the yields of reducing sugar.
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JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 132
·期 23
·
IF 2.877
Peng Yanyan,Jiang Dayong,Zhao Man
Photodetectors (PDs) that combine inorganic semiconductors with organic lead halide perovskites to produce broader spectral responses have captured great interest from researchers; however, the imperfect perovskite crystallinity and the defects on the film surface are still the main factors inhibiting the PD's capability. Here, we proposed a simple method by introducing ionic liquid [1-butyl-3-methylimidazolium iodide (BMII)] into ZnO/CH 3 NH 3 PbI 3 to encourage the growth of perovskite grains, raise the crystallinity of perovskite, and reduce the trap states, finally enhancing the photoelectric performances. After the addition of BMII, there are 171-fold, 74-fold, and 76-fold increases, respectively, in the light–dark current ratio, the spectral responsivity, and the external quantum efficiency, meanwhile, detectivity can reach 2.58 × 10 13 Jones in the UV–vis range. The impressive results can be owed to the higher carrier concentration of ZnO/CH 3 NH 3 PbI 3 with BMII, which can facilitate the charge transfer and suppress the recombination of photogenerated carriers. This study may be of assistance to extend our knowledge of developing high-performance PDs.
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Soft Matter
·
2020
·Vol. 16
·期 45
·10368-10376
·
IF 3.14
Hongyu Guo,Qi Yu,Yuzhi Xiong,Fafu Yang
Although various AIE liquid crystals have been studied, AIE ionic liquid crystals (ILCs) are almost unknown to date. In this work, a series of novel AIE ILCs based on diphenylacrylonitrile-imidazole salts bridged by soft spacers with different anions were prepared in yields of 63–80%. The mesomorphic, photophysical and electrochemical properties were investigated systematically to elucidate the relationship between structures and properties. The results implied that they were the first room-temperature AIE ILCs with wide ranges of mesomorphic temperature, good fluorescence emission in both the solid state and mesophase, and stable electrochemical behaviour. The samples with one alkyl chain possessed the SmA2 mesophase while the samples with two alkyl chains prefered the Colh mesophase. The larger anions resulted in the bigger layer spacing length for the SmA2 mesophase and smaller values of ncell in each slice of Colh mesophase. The fluorescence quantum yields in the mesophase maintained reasonable values (0.15–0.22), which decreased a little in comparison with that in solid films (0.18–0.26) due to the orderly molecular stacking in the mesophase. The cyclic voltammetry experiments confirmed that all of them possessed similar and stable electrochemical behaviour. This research not only presented the first room-temperature AIE ILCs with excellent mesomorphic, photophysical and electrochemical properties, but also elucidated the relationship between structures and properties to a certain degree, contributing to the further construction of novel AIE ILCs with excellent mesomorphic, photophysical and electrochemical properties.
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COLLOID AND POLYMER SCIENCE
·
2012
·Vol. 290
·期 17
·1785-1791
·
IF 2.331
Gao Hejun,Zhang Shaohua,Lu Fei,Jia Han,Zheng Liqiang
Graphene sheets can be effectively dispersed by a novel ionic liquid-based polyether, poly(1-glycidyl-3-methylimidazolium chloride) (PGMIC), in aqueous solution. The reduction of graphene oxide to graphene is confirmed by UV–Vis and Raman spectrum in aqueous solution of PGMIC. TEM image showed that the stable and uniform dispersion of graphene sheets were obtained. Both the TGA and AFM analysis indicated that the graphene sheet was covered by PGMIC. FTIR spectra demonstrated that n–π, cation–π interactions and electrostatic repulsions played important roles in the dispersion of graphene sheets.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Hua Cheng,Ping Wang,Jiangshui Luo,Jan Fransaer,Dirk E. De Vos,Zheng-Hong Luo
To search for robust CO2 capture materials, two types of ionic liquids, namely, (p-vinylbenzyl)trimethylammonium tetrafluoroborate ([VBTMA][BF4]) and (p-vinylbenzyl)trimethylammonium hexafluorophosphate ([VBTMA][PF6]), were synthesized and immobilized onto a mesoporous silica (meso-silica) support by the surface-initiated atom-transfer radical polymerization (SI-ATRP) method. The prepared sorbents meso-SiO2–P[VBTMA][BF4] and meso-SiO2–P[VBTMA][PF6] were well-characterized. Their adsorption behaviors toward CO2 from simulated flue gases at different pressures were investigated using an adsorption column. Based on a simulated flue gas containing 10 vol % CO2 at 30 °C, the highest CO2 adsorption capacity of meso-SiO2–P[VBTMA][BF4] was 0.4025 mmol g–1, whereas the corresponding value for meso-SiO2–P[VBTMA][PF6] was 0.3793 mmol g–1. Compared with pure poly(ionic liquid)s, the existence of a meso-silica core improves the CO2 capture capacity. Furthermore, the presence of vapor can improve the CO2 capture capacity. However, an increase in temperature inhibits the CO2 capture capacity, implying that the nanocomposites should preferably be used at low temperature.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Shuaiqi Gao,Pengling Zhang,Zhenzhen Wang,Guokai Cui,Jikuan Qiu,Jianji Wang
The emission of SO2 from the combustion of fossil fuels leads to many environmental issues. The incorporation of ionic liquids (ILs) on porous supports to produce supported ionic liquids is an effective technology for SO2 capture. However, blockage of pore channels is one of the main problems of this technology, which results in a substantial decrease of absorption capacity. Herein, a novel type of ionic liquid, 1-methyl-3-(3-triethoxysilylpropyl) imidazolium tetrazolate, functionalized large pore sized 3D mesoporous FDU-12 sorbents has been synthesized through a chemical grafting method. The as-prepared materials are characterized using SAXS, N2 adsorption, TEM, XPS, elements analysis, EDS mapping, and TGA and then the performance of these materials to capture SO2 is studied. The IL@FDU-12 materials are found to exhibit a high absorption capacity of SO2 up to 8.19 mmol SO2/g-sorbent (i.e., 524.2 mg/g) and a fast absorption rate (ca. 6 min is needed to reach equilibrium) at 25 °C and 1 bar since blockage of pore channels is effectively avoided and the IL is highly dispersed in the channels. These materials can also be used for the effective capture of CO2 (1 bar) and low content of SO2 (10%). Moreover, they have excellent thermal stability and can be reused in many absorption/desorption cycles without loss of the high absorption capacity and fast sorption/desorption rate.
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Research
·
2019
·
IF 0
Yunru Yu,Jiahui Guo,Lingyu Sun,Xiaoxuan Zhang,Yuanjin Zhao
Inspired by helical or spiral veins, which endow plants with excellent flexibility and elasticity to withstand storms, we present novel hollow microsprings with ionic liquid encapsulation for flexible and stretchable electronics. The microsprings were generated by using a coaxial capillary microfluidic device to consecutively spin poly(vinylidene fluoride) (PVDF) presolution and an ionic liquid, which formed laminar flows in the coaxial injection microfluidic channels. The fast phase inversion of PVDF helps to form the core-shell structure of a microfiber and guarantees the in situ encapsulation of ionic liquid. The hybrid microfiber can then spiral and be further solidified to maintain the helical structure with increasing flow rates of the injection fluids. Because of the feasible and precise control of the injection fluids during the microfluidic spinning, the resultant microsprings have controlled core-shell structures, helical pitches, and corresponding electromechanical properties. By further embedding them into stretchable films, the simple paradigm of a flexible device shows great conductive performance in tensile tests and even motion cycles, which could be explored as a promising candidate in stretchable sensors, flexible electronics, and electronic skins.
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RSC Advances
·
2021
·Vol. 11
·期 34
·20760-20768
·
IF 3.361
Yue Hu,Salah Ahmed Sarhan Al-Shujaa,Bin Zhen,Yaping Zhang,Xianggao Li,Yaqing Feng
Electrophoretic display (EPD) is a type of flexible display which has attracted wide attention. In this work, blue nanosized crystals of cobalt aluminum oxide (CoAl2O4) were precipitated on silica nanoparticles, and then the nanocomposites were coated with an ionic liquid polymer (PIL) to give blue electrophoretic particles. The blue nanocomposites (SCAs) formed possess an excellent spherical structure, and the average diameter is about 188 nm. The porous silica matrix presents a relative light density, and the blue CoAl2O4 pigment offers excellent color. The outside ionic liquid polymer supplies the PIL/SCAs with a light density of 1.7915 g cm−3, excellent hydrophobicity and dispersion stability in the electrophoretic liquid. The fabricated single-particle EPD prototypes show a response time of 165 ms in the EPD cell with a 0.2 mm thickness, which is much faster than the commercial EPDs, and this is probably because of the unique composite structure.
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