RSC Advances
·
2025
·Vol. 15
·期 48
·40491-40500
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IF 4.6
Hanfei Deng,Simin Jia,Yu Zhang,Yuanyuan Zhang,Jiang Shao,Muhammad Wasim Afzal,Xue Liu,Dongbin Dang,Yan Bai
Multi-stimulus responsive materials have attracted significant attention due to their ability to respond dynamically to multiple external stimuli, including light, temperature, and chemical signals. Achieving both rapid response times and precise selectivity is essential for advancing the functionality of such materials. In this study, five polyoxometalate-based viologen ionic liquids (ILs) were synthesized through ion exchange between H3PMo12O40 and viologen ILs with varying substituents. These ILs demonstrated multi-stimulus responses to light and ammonia gas. Under Xe lamp irradiation, all ILs exhibited prominent photochromism, with C12–PMo12 undergoing a rapid change from light yellow to light green within just 5 seconds. Exposure to an H2O2 atmosphere for 3 hours resulted in the complete decolorization of C12–PMo12. Remarkably, after five cycles of coloring and decoloring, its absorbance remained virtually unchanged, highlighting its excellent reversibility and stability. Additionally, as the alkyl chain length of the viologen-based cation increased, the coloring rate accelerated, and the color contrast enhanced, likely due to the suppression of viologen radical quenching by longer carbon chains. These ILs also exhibited gas-chromic behavior in the presence of ammonia, showing high detection selectivity. Furthermore, the materials were successfully applied in inkless erasable printing and ultraviolet detection. The C12–PMo12-based carbon paper displayed clear and readable prints in only 10 seconds and could be bleached in an H2O2 atmosphere within 1.5 hours. These findings demonstrate that the synthesized ILs possess versatile multi-stimulus responsive properties, making them highly promising for applications in inkless printing, ultraviolet detection, and amine vapor sensing.
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高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Yuxiao Li,Meishan Zhang,Xueyan Wang,Zhun Li,Lianhua Zhao
Sulfonated poly (ether ether ketone) (SPEEK, SP) with tetraethoxysilane (TEOS) and diethylethylammonium trifluoromethanesulfonate ([dema] [OTf]) were used to make SP/SiOx/OTf inorganic–organic composite membranes by the sol–gel method. The composite membranes were studied with respect to their structural, thermal, ionic liquid leeching (ILs), mechanical, and proton conduction properties. Fourier transform infrared spectroscopy (FT-IR) results showed that there exist intermolecular forces between the sulfonic groups, silica, and ILs in the composite membrane. Thermogravimetric (TG) results showed that the thermal stability of the SP/SiOx/OTf composite membrane is better than that of the pristine SPEEK membrane. IL leaching studies showed that the sulfonic group could help to reduce the loss of ILs. The introduction of silica in the SP/SiOx/OTf composite membrane could further reduce the loss of ILs, and also reduce the swelling degree of the composite membrane. Dynamic mechanical analysis (DMA) data showed that the introduction of silica can increase the flexibility of membranes, and improve the mechanical properties. A proton conductivity of 2.003 × 10 −2 S/cm was obtained for a 50 wt% [dema][OTf] doped SP-66/SiOx/OTF-50 composite membranes at 220 °C under anhydrous conditions.
研究领域:
材料科学
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高分子化学
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能源材料
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电化学
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膜科学
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BIORESOURCE TECHNOLOGY
·
2011
·Vol. 102
·期 11
·6469-6472
·
IF 4.365
Feng Guo,Zhen Fang,Xiao-Fei Tian,Yun-Duo Long,Li-Qun Jiang
Catalytic conversion of un-pretreated Jatropha oil with high-acid value (13.8 mg KOH/g) to biodiesel was studied in ionic liquids (ILs) with metal chlorides. Several commercial ILs were used to catalyze the esterification of oleic acid . It was found that 1-butyl-3-methylimidazolium tosylate ([BMIm][CH 3 SO 3 ]; a Brønsted acidic IL) had the highest catalytic activity with 93% esterification rate for oleic acid at 140 °C but only 12% biodiesel yield at 120 °C. When FeCl 3 was added to [BMIm][CH 3 SO 3 ], a maximum biodiesel yield of 99.7% was achieved at 120 °C. Because metal ions in ILs supplied Lewis acidic sites, and more of the sites could be provided by trivalent metallic ions than those of bivalent ones. It was also found that the catalytic activity with bivalent metallic ions increased with atomic radius. Mixture of [BMIm][CH 3 SO 3 ] and FeCl 3 was easily separated from products for reuse to avoid producing pollutants.
研究领域:
能源化学
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绿色化学
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催化化学
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生物燃料
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有机化学
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环境友好过程
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可再生能源
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Small
·
2026
·
IF 11.8
Fukang Deng,Lianglong Xie,Kangchun Li,Fuchuan Huang,Fangxue Hang,Debao Niu,Kai Li,Yougen Hu
Transparent electromagnetic wave (EMW) absorbing materials are highly desirable for emerging optoelectronic and electromagnetic protection technologies, yet simultaneously achieving high optical transparency, strong interfacial adhesion, and efficient EMW attenuation remains challenging due to the intrinsic trade-off between dipole alignment and interfacial mobility. Here, we report a molecular design strategy based on proton–ion cooperative interactions to construct a reconfigurable polar network in a transparent polyelectrolyte hydrogel. By incorporating polymerizable choline–proline ionic liquids (CPILs) into a hydrogen-bonded poly(acrylic acid) (PAA) matrix, the spatial distribution and orientation dynamics of polar moieties are regulated through synergistic covalent and dynamic noncovalent interactions. These proton–ion cooperative interactions enable simultaneous enhancement of dielectric polarization and interfacial adhesion within a single transparent network. Consequently, the hydrogel achieves an effective electromagnetic absorption bandwidth of 6.5 GHz and a minimum reflection loss of −49.31 dB, while maintaining an average visible-light transmittance exceeding 96% and a shear adhesion strength of 7.71 MPa on glass substrates. This work establishes a molecular-level design paradigm for coupling dielectric polarization and interfacial adhesion in transparent soft materials, providing new opportunities for flexible electronics and transparent electromagnetic wave absorption.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qingrong Wu,Guilin Li,Yanyan Cheng,Bangyu Fan,Yinge Bai,Nian Zhang,Zhongzhi Wang,Xiangping Zhang,Suojiang Zhang
Efficient purification of ethylene (C 2 H 4 ) from ethane (C 2 H 6 ) is one of the seven chemical separations which can change the world. Chemical absorption is considered as the most promising method for C 2 H 4 /C 2 H 6 separation. However, the two critical separation properties of absorbent, the solubility and selectivity, are always trade-offs, which are still needed to both promote and balance in the viewpoint of industrial application. Herein, a series of novel silver-containing protic imidazolium ionic liquids (SPILs), with high chemical activity for efficient C 2 H 4 absorption, have been designed and synthesized. The physical properties of the prepared silver-containing ionic liquids (SILs) were first characterized. Then the separation performances of C 2 H 4 /C 2 H 6 by SPILs and silver-containing aprotic ionic liquids (SAILs) were carefully compared. The C 2 H 4 /C 2 H 6 selectivity of SPILs (16.73) was eight times higher than the value of the latter. Then, the C 2 H 4 absorption mechanism was confirmed by density functional theory (DFT) calculations. The charge density of Ag + was greater and the Gibbs free energy (ΔG) of C 2 H 4 absorption was more negative in [Bim] n [Ag(NTf 2 ) n+1 ]. The proposed SPILs, [Bim] 1.5 [Ag(NTf 2 ) 2.5 ], had a high C 2 H 4 /C 2 H 6 selectivity of 41.2 and C 2 H 4 solubility of 1.86 mol C 2 H 4 /mol Ag + , which were the highest value of ionic liquids (ILs) absorption reported so far. The [Bim] 1.5 [Ag(NTf 2 ) 2.5 ] exhibited excellent reversibility after five absorption–desorption cycles. An absorbent designed strategy of SPILs was proposed with enhanced solubility and selectivity for C 2 H 4 /C 2 H 6 separation.
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Polymers
·
2023
·Vol. 15
·期 8
·1837
·
IF 5
Junchi Ma,Shihao Zhou,Yuanchang Lai,Zhaodi Wang,Nannan Ni,Feng Dai,Yahong Xu,Xin Yang
Metal–organic frameworks (MOFs) have been previously shown as an emerging modified class of epoxy resin. In this work, we report a simple strategy for preventing zeolitic imidazolate framework (ZIF-8) nanoparticles from agglomerating in epoxy resin (EP). Branched polyethylenimine grafted ZIF-8 in ionic liquid (BPEI-ZIF-8) nanofluid with good dispersion was prepared successfully using an ionic liquid as both the dispersant and curing agent. Results indicated that the thermogravimetric curve of the composite material had no noticeable change with increasing BPEI-ZIF-8/IL content. The glass transition temperature (Tg) of the epoxy composite was reduced with the addition of BPEI-ZIF-8/IL. The addition of 2 wt% BPEI-ZIF-8/IL into EP effectively improved the flexural strength to about 21.7%, and the inclusion of 0.5 wt% of BPEI-ZIF-8/IL EP composites increased the impact strength by about 83% compared to pure EP. The effect of adding BPEI-ZIF-8/IL on the Tgof epoxy resin was explored, and its toughening mechanism was analyzed in combination with SEM images showing fractures in the EP composites. Moreover, the damping and dielectric properties of the composites were improved by adding BPEI-ZIF-8/IL.Keywords:BPEI-ZIF-8/IL;epoxy composite;mechanical properties;thermal properties;damping properties;dielectric properties
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高影响因子
RSC Advances
·
2023
·Vol. 13
·期 17
·11635-11641
·
IF 3.9
Jiru Guo,Yanxia Zheng,Yuchao Li,Zijian Wen,Xiuxu Shen,Yansong Zhao
4,4′-Dichlorodiphenyl sulfoxide is the main raw material for the manufacture of polysulfone, polyether sulfone and other engineering plastics. It is also an intermediate for medicines, dyes and pesticides, which has been widely utilized in engineering plastics, fine chemicals and other fields. The alkylation of chlorobenzene with thionyl chloride can give 4,4′-dichlorodiphenyl sulfoxide as a product using Lewis acidic ionic liquids. In this work, metal-based methylimidazolium ionic liquids were synthesized, which were found to be efficient catalysts for alkylation reactions. The molar ratio of different metal chlorides to 1-butyl-3-methyl imidazole chloride and the influence of different metal chlorine additives on the catalytic Lewis acid center were investigated. The fissionable species of AlCl3 in ionic liquids will enhance the acidity of ionic liquids and, thus, promote the catalytic performance of ionic liquids. Under the optimized reaction conditions, the conversion rate of excess chlorobenzene was 45.3% and the selectivity of 4,4′-dichlorodiphenyl sulfoxide was 31.9%.
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 6
·3837-3852
·
IF 5.7
Zhang Lihua,Feng Song,Huang Furong,Li Bo,Li Yunqi,Sheng Hailiang,Hu Lijie,Liang Songmiao,Xie Haibo
Well-dispersed gold nanoparticles (Au NPs) anchored by polymeric three-dimensional hydrogels for catalysis have received great attention, especially in aqueous-phase catalysis. In this study, thiol-functionalized chitosan poly(protic ionic liquids) hydrogel (TCPPILH) is delicately designed and prepared as a selective support material to anchor Au NPs by taking advantages of Au-thiol chemistry and facile preparation of protic ionic liquids (PILs). The TCPPILH was successfully synthesized by a protonation reaction of chitosan with 3-mercaptopropionic acid (MPA) and mercaptosuccinic acid (MSA) in water, and followed by shaping in ethanol coagulation bath via solution-gelation transition, and the properties can be facilely adjusted by changing the feed ratio of MPA and MSA. It is found that the TCPPILH can act as a selective support for adsorption of Au 3+ ions, and a maximal anchoring capacity for Au NPs could reach up to 151.5 mg/g. The as-prepared TCPPILH @ Au NPs catalysts were systematically characterized by FTIR, XPS, SEM, TEM, XRD and ICP-OES analysis, and the findings demonstrated that the TCPPILH could effectively inhibit the agglomeration of Au NPs (ca. 4.20 nm in diameter). As a proof of concept, hydrogenation of water pollutes, such as 4-nitrophenol and azo dyes with NaBH 4 as reductant was selected as model applications, and the results indicated that TCPPILH @ Au NPs catalysts exhibited high catalytic activity and satisfactory reusability. Graphical abstract
Thiol-functionalized chitosan poly(protic ionic liquids) hydrogel (TCPPILH) was delicately designed and prepared as a selective support material to adsorb Au 3+ and anchoring Au NPs by taking advantages of Au-thiol chemistry and facile preparation of protic ionic liquids (PILs). This TCPPILH@Au NPs catalysts exhibited desired catalytic activity for the hydrogenation of 4-nitrophenol and azo dyes in water.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Li Wang,Yi Zeng,Hongsheng Lu,Zhiyu Huang,Ya Liu
Organogelators and hydrogelators which belong to low-molecular-weight gelators (LMWGs) have attracted considerable attention due to various practical applications. Whether organogelators or hydrogelators, they can congeal single oil or water phase. However, gelators capable of gelation at oil/water interface have thus far remained unexplored. Herein, we report a class of surface-active ionic liquids (SAILs) based on dimethylcyclohexylamine and fatty acids. They can form high-strength gels at the oil/water interface instead of in single oil or water phase. These molecules spontaneously aggregate at oil/water interface, and then self-assemble into lamellar liquid crystalline structure, as evident from POM and SAXS analysis. Rheology analysis shows that these gels are of very high viscosity, strength and stability. These unique characters make these SAILs can effectively block the oil–water interface, which has potential application in oilfield development or oil leaks from underwater tubes.
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高影响因子
LANGMUIR
·
2023
·
IF 3.9
Zhaoyang Qi,Jinyi Chen,Jie Chen,Ting Qiu,Changshen Ye
Solid-supported ionic liquid catalysts (SILs) are the simplest form of a heterogenized ionic liquid and have attracted soaring attention because of the high catalytic activity as well as separation. Unfortunately, instability severely hinders their practical application, and the reason for the deactivation of SILs has not been investigated in detail. In the present study, the immobilized ionic liquid catalysts MIL-101-[IA-SO3H][HSO4] and MIL-101-[IA-COOH][HSO4] were prepared and used to study the stability in the esterification reaction. The results show that compared with MIL-101-[IA-COOH][HSO4], MIL-101-[IA-SO3H][HSO4] has a higher catalytic activity and a lower stability. The deactivation mechanism is discussed based on experiments and theoretical analysis: the protons on −SO3H dissociate in a polar solvent and combine with anion HSO4–, and then, the formative H2SO4 molecule will leach out into the solvent. Our discussion indicates that the stability of immobilized ionic liquids is determined by the substituents of ionic liquid cations and becomes the significant factor controlling the stability limits. The study presented here would be important for understanding the deactivation reason and can help in choosing the suitable cation to avoid leaching of the active site during the reaction.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yanyan Cheng,Fujian Li,Qingrong Wu,Kuilin Peng,Bangyu Fan,Yinge Bai,Zhongzhi Wang,Nian Zhang,Xiangping Zhang
Metal-containing ionic liquids (MILs) have been considered as promising solvents for ethylene/ethane (C 2 H 4 /C 2 H 6 ) separation. With multiple 4f and 5d empty electronic orbitals, special electronic configuration and abundant electron energy levels, rare earth elements have potential to be great electron acceptor of C 2 H 4 . Herein, a new strategy of rare earth metal ionic liquids (REMILs), 1-butyl-3-methylimidazolium trifluoromethanesulfonate containing erbium ([Bmim][TFO]/Er(TFO) 3 ) in N, N-dimethylformamide (DMF) was exploited to separate C 2 H 4 /C 2 H 6 for the first time. The complexation between Er 3+ and C 2 H 4 and interactions in absorbents were adopted to achieve fast and selective C 2 H 4 absorption. The physical properties of the absorbents were measured and studied firstly. The addition of 20 wt% DMF in REMILs was optimized with a decrease in viscosity of 6–7 times at 293 K. The absorption parameters, such as Er 3+ concentration, temperature and regeneration of absorbents were also investigated systematically. The results showed that the selectivity of C 2 H 4 /C 2 H 6 was enhanced with increasing Er 3+ concentration. The solubility of C 2 H 4 in [Bmim][TFO]/Er(TFO) 3 + 20 wt% DMF was 0.95 mg/g with C 2 H 4 /C 2 H 6 selectivity of 10 (at 303 K, 0.1 MPa), much higher than that of conventional ILs. The interaction energy (ΔE) of Er 3+ -C 2 H 4 was more negative than Er 3+ -C 2 H 6 through density functional theory (DFT). Furthermore, the rare earth absorbents exhibited excellent reversibility after five cycles. In summary, this work provides a potential method for efficient separating C 2 H 4 /C 2 H 6 via REMILs in DMF solution.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jie Yin,Wendi Fu,Jinrui Zhang,Xinyu Liu,Xinmiao Zhang,Chao Wang,Jing He,Wei Jiang,Hongping Li,Huaming Li
Porous ionic liquids are a novel category media that possesses the catalytic activity of porous solids and the extraction property of ionic liquids. Herein, a new type of porous ionic liquids (denoted as UiO-66-T3PILs) was fabricated by employing UiO-66(Zr) as the pore generator and the ionic liquid ([P 6,6,6,14 ][NTF 2 ]) as the size-excluded solvent for extraction coupled catalytic oxidative desulfurization (ECODS) using hydrogen peroxide (H 2 O 2 , 30 wt%) as an oxidant. Furthermore, several significant reaction parameters such as UiO-66 loading in porous ionic liquids, reaction temperatures, molar ratio of H 2 O 2 /DBT and sulfide species as well as recyclability were investigated in detail. As UiO-66-T3PILs exhibited higher efficiency (95.3%) than the summarized efficiency of UiO-66 and [P 6,6,6,14 ][NTF 2 ], there did exist a synergistic effect between the UiO-66(Zr) moiety and the ionic liquid moiety in UiO-66-T3PILs. With the assistance of density functional theory calculations, a possible mechanism was proposed that aromatic sulfur compounds in the oil phase were first extracted into ionic liquids moiety phase via C-H···π interactions and then rapidly oxidized by OH radicals in the presence of the UiO-66 moiety. This work will pave the way for the rational design of novel porous ionic liquids towards catalysis.
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危险品化学品经营许可证（带存储）