JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Kehui Hu,Mai Ouyang,Qianwen Jiang,Huiwen Zhang,Mengke Kong,Guowei Wang,Linghua Zhuang
The micellization characteristics of nonionic surfactant (Triton TX-100, p-octyl polyethylene glycol phenyl ether) and two anionic surface active ionic liquids (SAILs) were investigated by surface tension measurements, steady state fluorescence tests, dynamic light scattering (DLS), H Nuclear magnetic resonance, and density functional theory (DFT) calculations. The anionic SAILs were 1-ethoxycarbonyl-3-methylimidazolium dodecyl sulfate ([E tmim ][C 12 H 25 SO 4 ]) and 1-ethoxycarbonyl-3-butylimidazolium dodecyl sulfate ([E tbim ][C 12 H 25 SO 4 ]). CMC mix values of SAIL/TX-100 mixtures were between CMC values of individual surfactants, and decreased with the increase of the molar fraction of TX-100. The negative β values (interaction parameter) of SAIL/TX-100 mixtures indicated good synergistic effect amid SAIL/TX-100 mixtures. [Etbim][C 12 H 25 SO 4 ] showed stronger attractive interactions than [Etmim][C 12 H 25 SO 4 ] during SAIL/TX-100 micellization. The mixed micelles contained a larger molar fraction of TX-100 over the entire range of composition. At same molar fraction of TX-100, X 1 values of [Etbim][C 12 H 25 SO 4 ]/TX-100 mixtures were lower than those of [Etmim][C 12 H 25 SO 4 ]/TX-100 mixtures. With addition of SAIL, the particle sizes of SAIL/TX-100 micelles decreased. With the increase of SAIL concentrations, the particle sizes of SAIL/TX-100 micelles decreased. In presence of SAILs ([E tmim ][C 12 H 25 SO 4 ] or [Etbim][C 12 H 25 SO 4 ]), all protons of TX-100 moved downfield. The chemical shifts of protons in [Etmim][C 12 H 25 SO 4 ] or [Etbim][C 12 H 25 SO 4 ] slightly moved upfield. DFT simulations demonstrated the presence of hydrogen bonds between the imidazolium cation of SAILs and EO chain of TX-100, and between sulfate anion group(-SO 4 -) of SAILs and hydrogen atoms in TX-100. The information will shed light on the rapid screening of novel anionic SAIL/surfactant mixtures for practical applications.
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MATERIALS RESEARCH BULLETIN
·
2013
·
IF 1.913
Changdong Gu,Heng Zhang,Xiuli Wang,Jiangping Tu
A facile and low-temperature method is developed for SnO 2 /graphene composite which involves an ultrasonic-assistant oxidation–reduction reaction between Sn 2+ and graphene oxide in a choline chloride–ethylene glycol based ionic liquid under ambient conditions. The reaction solution is non-corrosive and environmental-friendly. Moreover, the proposed technique does not require complicated infrastructures and heat treatment. The SnO 2 /graphene composite consists of about 4 nm sized SnO 2 nanoparticles with cassiterite structure mono-dispersed on the surface of reduced graphene oxide. As anode for lithium-ion batteries, the SnO 2 /graphene composite shows a satisfying cycling stability (535 mAh g −1 after 50 cycles @100 mA g −1 ), which is significantly prior to the bare 4 nm sized SnO 2 nanocrsytals. The graphene sheets in the hybrid nanostructure could provide a segmentation effect to alleviate the volume expansion of the SnO 2 and restrain the small and active Sn-based particles aggregating into larger and inactive clusters during cycling.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 11
·e5198
·
IF 3.259
Yu Ru,Yanli Huang,Yuanyuan Wang,Liyi Dai
Well distributed Pd-Cu bimetallic alloy nanoparticles supported on amine-terminated ionic liquid functional three-dimensional graphene (3D IL-rGO/Pd-Cu) as an efficient catalyst for Suzuki cross-coupling reaction has been prepared via a facile synthetic method. The introduction of IL-NH 2 cations on the surface of graphene sheets can effectively avoid the re-deposition of graphene sheets, allowing the catalyst to be reused up to 10 cycles. The addition of Cu not only saves cost but also ensures high catalytic efficiency. It is worthy to note that the catalyst 3D IL-rGO/Pd 2.5 Cu 2.5 can efficiently catalyze the Suzuki cross-coupling reaction with the yield up to 100% in 0.25 h, almost one-fold higher than that by the pristine IL-rGO/Pd 2.5 catalyst (52%). The Powder X-Ray Diffraction (XRD), combining energy dispersive X-ray spectroscopy (EDS) mapping results confirm the existence and distribution of Pd and Cu in the bimetallic nanoparticles. The transmission electron microscopy (TEM) reveals the nanoparticle size with an average diameter of 3.0 ± 0.5 nm. X-ray photoelectron spectroscopy (XPS) analysis proved the presence of electron transfer from Cu to Pd upon alloying. Such alloying-induced electronic modification of Pd-Cu alloy and 3D ionic liquid functional graphene with large specific surface area both accounted for the catalytic enhancement.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Danyi Li,Li Yuan,Guozheng Liang,Aijuan Gu
The rapid development of new-generation flexible touch display panels puts forward more requirements on the overlays, not only including colorlessness and transparency but also having self-healing and remolding abilities as well as high dielectric constant. Herein, new self-healable and remoldable polyurethane films (PULEx) with high dielectric constant have been developed through building of reversible cross-linked networks with special synergistic effect between lithium salt and ionic liquid. The integrated performance of PULEx was systematically investigated. Results show that as the loadings of lithium salt and ionic salt increase, films show increased dielectric constant and self-healing ability. The film with suitable composition (PULE7.5) has the best comprehensive performance; its dielectric constants (104–106 Hz) range from 9.6 to 6.1, which are comparable to those of glass (commonly used overlay for rigid capacitive touchscreen panels). The construction of reversible covalent cross-linking endows PULE7.5 with good mechanical strength, high self-healing efficiency after complete fracture (92.7%), and high recovery of mechanical properties after remolding (91.8%). In addition, the colorless PULE7.5 has high transparency (90.7% transmittance at 550 nm) and can freely convert among three shapes of bending, scrolling, and S-shape, showing great prospects in fabricating flexible display devices. The mechanism behind these outstanding integrated performances of PULE films is investigated through correlation with structures.
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ELECTROANALYSIS
·
2013
·Vol. 26
·期 1
·191-198
·
IF 2.817
Chunfeng Wang,Panpan Xu,Kelei Zhuo
An electrochemical biosensor for the simultaneous determination of dopamine (DA) and uric acid (UA) in the presence of ascorbic acid (AA) was developed using a glassy carbon electrode modified with 1-butyl-3-methylimidazolium 2-amino-3-mercaptopropionic acid salt ionic liquid functionalized graphene (IL G/GCE). The IL G/GCE possessed excellent electrocatalytic activity toward the oxidation of AA, DA and UA. The separations of oxidation peak potentials of AA DA, DA UA, and AA UA were 147, 145 and 292 mV, respectively. The electrochemical sensor showed excellent selectivity and stability and was applied successfully to the determination of DA and UA in real urine samples using the standard addition method with recoveries of 97.0–103.8 %.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Rujie Li,Wanhang Wang,Yangyang Wang,Xiaoyu Wei,Ziqi Cai,Zhiyong Zhou
A novel ionic liquid named 1-butyl-3-methylimidazolium tetraphenylboron ([Bmim]Bph 4 ) containing a stereo symmetric structure of Bph 4 - was synthesized and used as co-extractants with TBP and CH 2 BrCl as extractant and diluent for selective extraction of lithium ions from salt lake brines with high molar ratio of magnesium to lithium. The effects of extraction conditions containing molar ratio of co-extractant to lithium ion, volume percentage of TBP and O/A phase ratio on extraction performance were investigated. Under the optimal extraction conditions, the maximum separation factor of lithium to magnesium reached up to 2754 after one single-stage extraction process. After four stages of counter-current extraction process, the extraction efficiency of Li + reached up to 99.47%. Then the washing and stripping conditions were optimized with the combination of LiCl and NaCl solution as the washing agent and Na 2 CO 3 solution as the stripping agent. After that, 10 cycles of the whole extraction experiments were carried out and the organic phase exhibited excellent reusability and stability. Since no acid and alkaline were used throughout the extraction process, the novel extraction process is greener and more environmentally friendly than the traditional solvent extraction process.
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ELECTROPHORESIS
·
2016
·Vol. 37
·期 12
·1624-1631
·
IF 2.482
Teng Ma,Zheng Li,Qiong Jia,Weihong Zhou
We developed a CE and ultrasound-assisted temperature-controlled ionic liquid emulsification microextraction method for the determination of four parabens (methyl paraben, ethyl paraben, propyl paraben, and butyl paraben) in personal care products including mouthwash and toning lotion. In the proposed extraction procedure, ionic liquid (IL, 1-octyl-3-methylimidazolium hexafluorophosphate) was used as extraction solvent, moreover, no disperser solvent was needed. Parameters affecting the extraction efficiency including volume of IL, heating temperature, ultrasonic time, extraction time, sample pH, ionic strength, and centrifugation time were optimized. Under the optimized conditions, the method was found to be linear over the range of 3–500 ng/mL with coefficient of determination ( R 2 ) in the range of 0.9990–0.9998. The LODs and LOQs for the four parabens were 0.45–0.72 ng/mL and 1.50–2.40 ng/mL, respectively. Intraday and interday precisions (RSDs, n = 5) were in the range of 5.4–6.8% and 7.0–8.7%, respectively. The recoveries of parabens at different spiked levels ranged from 71.9 to 119.2% with RSDs less than 9.5%.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Wei Bao,Zhenyuan Hu,Yaying Wang,Jianghong Jiang,Shikang Huo,Weizhen Fan,Weijie Chen,Xiao Jing,Xinyang Long,Yunfeng Zhang
Endowing polyethylene oxide (PEO)-based electrolyte with low crystallinity and high efficient Li + transport channels is urgently required for next generation all-solid-state lithium metal batteries (LMBs). Herein, a new type of oxyethyl containing poly(ionic liquid) modified graphene oxide nanoparticles ( ox -PIL@GO) is coincidentally proposed for preparing PEO based organic–inorganic composite electrolyte membranes (CPEs). Both experimental and DFT simulation results indicate that the dissociation of the LiTFSI is significantly enhanced by the anticipated electrostatic interaction between imidazolium cation and TFSI - anions in CPEs. In addition, the formed electrostatic interaction can also inhibit the movement of TFSI - , giving rise to the increased lithium transference number of 0.61 from 0.21 for the neat PEO/LiTFSI electrolyte. Furthermore, the ion–dipole interaction between imidazolium cation and PEO chain largely reduces the crystallinity of PEO and the ionic conductivity of 1.01 × 10 -4 S cm −1 at 40 °C is successfully obtained. As a result, the ox -PIL@GO incorporated PEO electrolyte enables the Li||Li symmetric cell with long-term, square-wave galvanostatic cycling test of 800 h at current density of 0.1 mA cm −2 at 50 °C and the solid-state LiFePO 4 |CPE|Li battery with high discharge specific capacity of 116 mAh g −1 at 40 °C at 1C for 300 cycles.
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Catalysts
·
2025
·Vol. 15
·期 5
·406
·
IF 4
Ranran Li,Yuqiao Jiang,Linyan Cheng,Cheng Fang,Hongping Li,Jing Ding,Hui Wan,Guofeng Guan
Strategic utilization of carbon dioxide as both a carbon mitigation tool and a sustainable C1 feedstock represents a pivotal pathway toward green chemistry. Although poly(ionic liquid)s (PILs) exhibit promise in CO2conversion, conventional divinylbenzene (DVB) cross-linked architectures are limited by reduced ionic density and limited accessibility of active sites. Herein, we reported a binuclear imidazolium-functionalized PIL catalyst (P-BVIMCl), synthesized through a simple self-polymerization process, derived from rationally designed ionic liquid monomers formed by quaternization of 1,4-bis(chloromethyl)benzene with N-vinylimidazole. The dual active sites in P-BVIMCl-quaternary ammonium cation (N+) and nucleophilic chloride anion (Cl−) synergistically enhanced CO2adsorption/activation and epoxide ring-opening. Under optimal catalyst preparation conditions (100 °C, 24 h, water/ethanol = 1:3 (v/v), 10 wt% AIBN initiator) and reaction conditions (100 °C, 2.0 MPa CO2, 10 mmol epichlorohydrin, 6.7 wt% catalyst loading, 3.0 h), P-BVIMCl catalyzed the synthesis of glycerol carbonate (GLC) with a yield of up to 93.4% and selectivity of 99.6%, maintaining activity close to 90% after five cycles. Systematic characterization and density functional theory (DFT) calculations confirmed the synergistic activation mechanism. This work established a paradigm for constructing high-ionic-density catalysts through molecular engineering, advancing the development of high-performance PILs for industrial CO2valorization.
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高影响因子
ULTRASONICS SONOCHEMISTRY
·
2025
·
IF 9.7
Mengyang Hou,Chengyuan Lin,Lin Zhu,Zhaoxiang Bian
This study aimed to enhance the valorization of Chaenomeles speciosa leaves as a sustainable source of bioactive phenolics. An innovative ionic liquid-based ultrasound-assisted extraction (IL-UAE) method was developed for extracting phenolic compounds. Among 10 structurally diverse ILs, [BMIM]Br demonstrated superior extraction performance. Using a combination of single-factor design and response surface methodology (RSM), the optimal parameters for IL-UAE were determined to be the [BMIM]Br concentration of 1.33 mol/L, ultrasonic power of 380 W, extraction time of 10 min, and liquid-to-solid ratio of 22 mL/g. Under these conditions, the yield of C. speciosa leaves total phenolics (CSL-TP) was 78.14 ± 0.35 mg/g, which was substantially higher than those obtained via conventional heat reflux and UAE. After extraction, the microstructures of C. speciosa leaves were examined using scanning electron microscopy (SEM), which confirmed the effectiveness of IL-UAE. Subsequently, NKA-II resin column chromatography was developed to effectively purify crude CSL-TP extracts, guided by leakage and elution curve evaluations, yielding phenolic extracts with a purity of 75.40 % ± 1.93 %. A UPLC–QqQ–MS/MS method was developed for the quantitative analysis of nine major phenolics in purified CSL-TP extracts. Furthermore, bioactivity assessments demonstrated that the purified CSL-TP extracts efficiently scavenged radicals and effectively inhibited the proliferation of HCT-116 and HT-29 cell lines. These results highlight the potential of C. speciosa leaves as a valuable resource for the pharmaceutical and food industries, paving the way for the development of innovative therapeutic products and functional foods.
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PubMed
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Bo Sun,Xiaona Pan,Yu Tian,Wenlong Bi,Menglin Feng,Fenwu Liu,Qingjie Hou
Microbial fuel cells (MFCs) represent a promising clean energy technology with significant application potential. However, their implementation is constrained by the limitations of current membrane materials. Polyvinylidene fluoride-hexafluoropropylene (PVDF-co-HFP) is a material that has garnered interest in the field of electrochemical systems because of its facile moldability into various shapes and sizes of membranes, positioning it as a highly promising alternative to high-cost commercial membranes. Nevertheless, enhancing its electrochemical characterization remains a pivotal challenge to be surmounted for its broad adoption. In this study, an efficient PVDF-co-HFP membrane, augmented with PP13-TFSI ionic liquid and sulfonation (Membrane P-I&S), was successfully synthesized, and its potential as an ion exchange membrane in MFCs was evaluated. The findings indicated that chlorosulfonic acid considerably enhances the hydrophilicity and proton transport properties of PVDF-co-HFP, with the ionic liquid posited as an effective means to augment the sulfonation effect. An MFCs incorporating Membrane P-I&S demonstrated a remarkable current production capacity and power density, exceeding those of the unmodified membrane by more than two and threefold, respectively. In addition, the MFCs based on Membrane P-I&S displayed prolonged cycling stability with a notably porous architecture and enhanced biofouling resistance. This study validates the development of a high-efficiency, cost-effective, and environmentally friendly membrane fabrication approach for application in bioelectrochemical systems. This will help promote the application of MFCs in the field of wastewater treatment and resource recovery.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xiujuan Wang,Jiarui Wang,Haojia Tian,Chenzhao Wang,Xiaowen Qiu,Zhicong Li,Zhibing Wang
Changes in amylase (AMY) concentration in urine serve a vital function in monitoring human health. However, the development of non-destructive, sensitive, and real-time assays for AMY concentration still faces serious challenges. In this study, a novel fluorescence/smartphone imaging colorimetric dual-mode sensing platform based on ionic liquid carbon dots (IL-CDs) was designed for the first time for assessing AMY concentration in urine. The obtained IL-CDs exhibited high sensitivity, good selectivity, and excellent stability. AMY can significantly decrease the fluorescence intensity through static quenching, enabling direct AMY concentration monitoring. Significantly, the proposed method was extended to the measurement of AMY in the urine samples with good spiked recoveries (96.98–103.81 %) as well as high accuracy. Furthermore, a smartphone-dependent detection method was developed after exploring the association between IL-CDs (G/(R + B)) fluorescence intensity at different concentrations of AMY, which simplified the AMY detection process. Through the combination of fluorescence and smartphone imaging colorimetry, it not only eliminated the damage to the human body during the detection process, but also realized the direct detection of AMY. The present method provided a fast and reliable new idea for monitoring human health.
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PubMed
高影响因子
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