ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xue Xing,Fuyun Yang,Yuying Yang,Guodong Yang,Xiao Xiao,Hongyu Chen,Xueyang Liu
In the field of ionic-liquid-based electrochemical gas sensors, the high viscosity of ionic liquids leads to slow mass transfer, restricting sensor performance. In this study, microstirbars with tunable sizes were fabricated via wet spinning. Using fluorescent dye as a tracer, these microstirbars homogeneously dispersed the dye in a droplet of ionic liquid within 2 min, nearly 200 times faster than the control group without stirring. When using ferrocene as a model reactant in chronoamperometry, the microstirbars enhanced the mass transfer process and the best stirring conditions (400 rpm, 8.0 wt %, l = 300 μm) were determined. When these optimized conditions were applied to oxygen detection, the results showed that the sensor sensitivity reached 0.63 μA·%–1, on par with the best performing gas sensors in the literature and 6 times higher than the control group without stirring. The stirred sensor achieved T90 of 7.0 s for 6.7% O2, three times faster than that of the control group without stirring (21 s). This study presents a straightforward approach to addressing the mass transfer challenges in ionic liquids, serving as a viable alternative to the complex designs of electrochemical sensors. As an approach to enhance mass transfer in microdroplets, we believe that the microstirring strategy is not limited to gas sensors. With advances in miniaturization of electromagnetic devices, it holds promise for a variety of sensing schemes.
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LANGMUIR
·
2019
·
IF 3.683
Xiaojiang Li,Baogang Wang,Shanshan Dai,Hongsheng Lu,Zhiyu Huang
CO2-responsive microemulsions based on ionic liquid 1,1,3,3-tetramethylguanidine-oleic acid (TMG-OA) have been designed to provide an approach for reducing the volatilization of amine in amine-containing microemulsions effectively and exhibit reversible transitions of microstructures. The ionic liquid TMG-OA was prepared by the direct neutralization of oleic acid (HOA) and 1,1,3,3-tetramethylguanidine (TMG, one of volatile and toxic amines). From the investigations of nuclear magnetic resonance hydrogen spectrum, pH, thermogravimetry, and automatic interface tension meter, the excellent properties of switchability, stability, and surface activity of TMG-OA were demonstrated, and then the ionic liquid-based microemulsions with CO2 response were prepared with TMG-OA (surfactant), HOA (oil phase), isopropyl alcohol (IPA, cosurfactant), and water. Interestingly, for microemulsions with a higher IPA content (47.42, 44.48 wt %), sizes of microemulsions are increased upon introducing CO2 and decreased upon addition of N2/65 °C. In addition, for microemulsions with a lower IPA content (26.22 wt %), the new microemulsions with different sizes are regenerated after the phase separation of emulsions generated by introducing CO2, and incomplete recovery of microemulsions can be observed upon addition of N2/65 °C. The reversible microstructures are induced by the swelling behavior and the reduced single phase area, which are caused by the reversible conversion between TMG-OA and HOA components.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yi Liu,Yuhang Hu,Jiarong Zhang,Jingsheng Zhou,Zhengkun Zhang,Li Wang,Jinglai Zhang
Immobilized ionic liquids are one of the most popular catalysts for the cycloaddition of carbon dioxide (CO 2 ) and epoxides with some distinguished advantages. However, the harsh reaction condition, especially for the high reaction pressure, is still the obstacle for its large-scale application. A series of amino-functionalized pyrazolium ionic liquids are grafted on SBA-15 in this work. Among them, SBA-15-APMPzBr(20) exhibits the best catalytic activity achieving 97.6% product yield under 0.5 MPa CO 2 pressure at 100 °C by using 100 mg SBA-15-APMPzBr(20) for 10 h. No solvent is added in the catalytic system. Moreover, SBA-15-APMPzBr(20) exhibits the good recyclability and generality. Its excellent catalytic performance is attributed to the contribution from both immobilized ionic liquids and the SBA-15 supporter. Besides the mesoporous feature, the hydroxyl groups in SBA-15 promote the ring-opening of substrate, which is testified by the experimental measurements and density functional theory calculations.
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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.
研究领域:
材料科学
·
化学
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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.
研究领域:
材料科学
·
光学工程
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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.
研究领域:
化学
·
物理化学
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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.
研究领域:
材料科学
·
化学工程
·
环境科学
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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.
研究领域:
材料科学
·
环境科学
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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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SEPARATION SCIENCE AND TECHNOLOGY
·
2012
·
IF 1.088
Jie-Ping Fan,Jing Cao,Xue-Hong Zhang,Jun-Zhong Huang,Tao Kong,Sheng Tong,Zhe-You Tian,Jian-Hang Zhu,Xiao-Kun Ouyang
Various ionic liquid-based aqueous two-phase systems (IL-ATPS) were evaluated to extract puerarin. The results indicated that the nature of ILs, the salting-out ability of salt, and the acidity and basicity of the salt-rich solution had important influence on the extraction efficiency. Various factors were optimized systematically, that is, the amount of IL, salt, puerarin, and short-chain alcohol. Under the optimal experimental conditions (the amount of K2HPO4 0.30–0.42 g/mL, [Bmim]Br 0.30–0.36 g/mL and 1.0 mL puerarin stock solution), the extraction efficiency of puerarin was over 99% by a single-step extraction, which indicated that the evaluated IL-ATPS was a prospective extraction medium. Finally, the IL-ATPS was successfully used to extract puerarin from Radix Puerariae Lobatae extracts.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Niankun Guo,Tianjing An,Zhaohao Li,Dan Gao,Jiaxi Yang
The chemical absorption and the physical adsorption constitute primary mechanisms in conventional CO 2 capture methods. This work proposes a novel porous ionic liquid synthesized by coupling these two mechanisms to enhance the CO 2 capture performance. Specifically, [TEPA][N-MIm] reacts with CO 2 to form carbamate species, while ZIF-8 nanoparticles are incorporated to construct stable cavity structures within the solution, providing physical adsorption sites for CO 2 . Based on CO 2 capture experiments and bubble dynamics high-speed photography experiments, CO 2 capture processes by [TEPA][N-MIm] consist of three phases: the rapid reaction phase, the slow capture phase, and the stabilization phase. Generally, improving the CO 2 mass transfer performance through methods such as increasing flowrate also enhances the capture performance. However, temperature elevation introduces more complex effects: The chemical reaction rate and the physical solubility exhibit opposing trends, and the CO 2 capture performance varies among different types of PILs. Additionally, when the solution temperature reaches a specific threshold, partial carbamate begins to decompose, leading to the stabilization of the CO 2 capture capacity.
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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.
研究领域:
材料科学
·
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