MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Xiaojie Zhao,Rong He,Yong Feng,Chuanyun Peng,Shaowen Zhang,Rui Liu
Sulfonamides (SAs) residues are commonly found in environmental samples, which is highly concerning for public safety and environmental protection. The detection of SAs is quite important but challenging. In this work, a kind of polymeric ionic liquid functionalized microparticles (PIL-FM) was synthesized via a simple free radical polymerization reaction, and applied as the adsorbent for pipette tip solid phase extraction (PT-SPE) of three SAs from river water, milk powder and honey samples. The adsorption performance of PIL-FM on SAs were evaluated using adsorption kinetics and adsorption isotherms, and the results showed that PIL-FM had the best selectivity for SMZ with the maximum adsorption capacity was as high as 45.05 mg·g −1 . The extraction process was optimized and the adsorption mechanism was preliminarily discussed. PIL-FM has the excellent selectivity for SAs mainly because of the strong π-π interaction, and the electrostatic repulsion between them in the elution step also has a positive impact. Under optimal conditions, combined with HPLC, this PT-SPE method had wide linearity (0.2–100 μg·L −1 , R 2 ≥ 0.9998) and low limits of detection (0.06–0.08 μg·L −1 ). The intra-day and inter-day repeatability were found to be 3.7 %–4.6 % and 4.5 %–6.2 %, respectively. The suggested PT-SPE method is simple, low cost, rapid, and efficient to extract SAs, and can be applied for the monitoring of SAs residues in the aquatic environment and in food.
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ANALYTICA CHIMICA ACTA
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2024
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IF 5.7
Xiang Wang,Xingrui Wang,Jiajia Wu,Jiayu Yu,Hanlin Zeng,Hanqi Yang,Huanjun Peng,Guangming Zhou,Jingdong Peng
Background Food safety has become an essential aspect of public concern and there are lots of detection means. Liquid chromatography plays a dominating role in food safety inspection because of its high separation efficiency and reproducibility. However, with the increasing complexity of real samples and monitoring requirements, conventional single-mode chromatography would require frequent column replacement and cannot separate different kinds of analytes on a single column simultaneously, which is costly and time-consuming. There is a great need for fabricating mixed-mode stationary phases and validating the feasibility of employing mixed-mode stationary phases for food safety inspection. Results This work fabricated multifunctional stationary phases for liquid chromatography to determine diverse food additives under the mixed mode of RPLC/HILIC/IEC. Two dicationic ionic liquid silanes were synthesized and bonded onto the silica gel surface. The functionalized silica was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and elemental analysis. Both columns provide satisfactory separation performance towards 6 hydrophilic nucleosides, 4 hydrophobic polycyclic aromatic hydrocarbons, and 5 anions. Great repeatability of retention (RSD <0.1 %) and column efficiency (100330 plate/m) were obtained. Thermomechanical analysis and linear solvation energy relationship investigated the retention mechanism. Finally, the better in two prepared columns was employed to separate and determine the contents of NO 2 − and NO 3 − in vegetables(highest 4906 mg kg −1 NO 3 − in spinach), preservatives in bottled beverages (180.8 mg kg −1 sodium benzoate in soft drink), and melamine in milk with satisfactory performance and recovery rates ranging from 96.4 % to 105.6 %. Significance This work developed a novel scheme for preparing mixed-mode stationary phases by dicationic ionic liquid which provides great separation selectivity. Most importantly, this work proved the superiority of employing mixed-mode stationary phases for food safety inspection, which might avoid high-cost and frequent changes of columns and chromatography systems in the near future.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2024
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IF 1.9
Rong Wang,Shuai Liu,Zhongying Li,Guanyi Peng,Ming Duan,Jinlong Pan,Hui Dong
The synergistic effect of ionic liquids (ILs) and anionic surfactants, ILs and cationic surfactants, and ILs and nonionic surfactants to form microemulsions has been studied by other researchers, while the synergistic effect of ionic liquids and zwitterionic surfactants to form microemulsions has not been reported. Here, we report the synergistic effect of imidazolium ionic liquid, 1-hexadecyl-3-methylimidazolium bromide [C16mim] [Br], and betaine-type zwitterionic surfactant, cocamidopropyl hydroxysultaine (CAHS), as surfactants, to form microemulsions with n-butanol, n-hexane and water. Phase behavior of the systems with different mass ratios of two surfactants, varied mass ratios of surfactant to cosurfactant (Km), and different temperatures are investigated by pseudo-ternary phase diagrams. The single-phase region of the microemulsion is maximized when the ratio of CAHS to [C16mim] [Br] is 1:4 and Km is 1.5, with little temperature dependence. The size and the polarity of microemulsions are explored. The synergistic effect of [C16mim] [Br] and CAHS is confirmed by surface tension and interface tension. A universal preparation method to form microemulsions by combining ionic liquids with zwitterionic betaine-type surfactants is provided and it play a pivotal role in broadening the potential uses of ILs in microemulsions.
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CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Huangli Yan,Chengwen Yu,Xianming Zhang,Meihua Tang,Shengli Chen
The large-scale commercialization of proton exchange membrane fuel cells (PEMFCs) has been hindered by the high demand of platinum (Pt) in the cathode due to the sluggish kinetics of the oxygen reduction reaction. Reducing the amount of Pt would worsen the problems caused by the adsorption of perfluorinated sulfonic acid (PFSA) ionomers to Pt via the side chains, namely, blocking the active sites of Pt and inducing densely packed layers of fluorocarbon backbones on Pt surface to obstruct local O 2 transport at the Pt/PFSA interfaces. This work aims at optimizing the Pt/ionomer interface to mitigate the sulfonate adsorption and in the meantime to reduce the local O 2 transport resistance ( R local ), by using a porous composite of 1-butyl-3-methylimidazolium hydrogen sulfate ionic liquid (IL) modified MOF-808 (BMImHSO 4 @MOF-808) as additive in cathodic catalyst layer (CCL). Through detailed physical, spectroscopic and electrochemical characterizations, we demonstrate a three-fold optimization mechanism of Pt/ionomer interface structure by BMImHSO₄@MOF-808: the unsaturated metal sites in MOF-808 effectively inhibit the sulfonate adsorption on Pt through coordination with the sulfonates of PFSA, thereby improving catalyst utilization; the pores in MOF-808 establish efficient transport channels for gaseous oxygen, significantly reducing R local ; the IL modification layers facilitate the formation of continuous proton transport networks, increasing proton conductivity. The incorporation of BMImHSO₄@MOF-808 in a low-Pt CCL (0.1 mg Pt cm –2 ) yields a peak power density of 1.9 W cm –2 for PEMFC under H 2 -O 2 condition, and ca. 20% increase of power density under H 2 -air condition as compared with conventional CCL, indicating the prospect of IL-MOF composites as an efficient additive to enhance the performance of PEMFCs.
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Jiaqi Chang,Fengsen Wang,Peng Zhang,Jiaqi Li,Xi Zhang,Fanhong Chen,Qianrui Lv
The controllable pore structures and surface functionalization characteristics of metal-organic frameworks (MOFs) provide new ideas for the development of high-performance humidity sensors. In this study, a hierarchical porous IL/UIO-66-NH 2 material with well-defined microporous-mesoporous channels was successfully synthesized. This unique porous structure results from the steric hindrance effect and competitive coordination of a carboxylic acid-functionalized ionic liquid used as the MOF precursor. By combining the Kelvin equation with Fick's law of diffusion, we revealed how the synergistic interactions within hierarchical pore structures enhance water-molecule transport dynamics, resulting in ultrafast sensor performance with response and recovery times of 0.6 s and 0.9 s, respectively. The humidity sensing mechanism was systematically investigated using electrochemical impedance spectroscopy. The sensor can accurately distinguish respiratory states and recognize short speech signals, providing a new material design strategy for wearable health monitoring devices.
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ACS Applied Polymer Materials
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2025
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IF 4.7
Yunhui Xia,Ruixuan Zheng,Bo Wang,Zheng Li,Guohui Cai,Mengjia Zhang,Jianghui Lin,Ling Li
The one-pot synthesis of 3-aryl-2-oxazolidinone from carbon dioxide (CO2), epoxides, and aniline represents a promising strategy for CO2 utilization. However, the efficiency remains far from adequate for industrial deployment, primarily due to the absence of purpose-designed catalysts. Herein, a dual-anion-rich (Br– and OAc–) polymeric ionic liquid (P-TBTOD-1/1/2) was synthesized via copolymerization of vinyl-functionalized ionic liquids (ILs), 1,1,3,3-tetramethylguanidine bromide ([AlTMG]Br), and 1,1,3,3-tetramethylguanidine acetate ([AlTMG]OAc), with divinylbenzene (DVB). The catalytic performance was evaluated for the synthesis of 3-phenyl-2-oxazolidinone from CO2, ethylene oxide (EO), and aniline in a batch autoclave at 2.5 MPa and 110 °C with a catalyst dosage of 4 wt % (based on aniline) for 1.0 h. The aniline conversion was 100%, and the yield of 3-phenyl-2-oxazolidinone was 75%. While Br– could effectively promote the cyclization reaction between CO2 and EO to form ethylene carbonate (EC), its catalytic efficiency in the subsequent conversion of 2-(phenylamino)ethanol and EC to 3-phenyl-2-oxazolidinone was limited. In contrast, OAc– exhibited significantly superior catalytic performance in this reaction. OAc– effectively activated aniline and EO to generate 2-(phenylamino)ethanol. The accumulation of 2-(phenylamino)ethanol and EC in the reaction system synergistically drove the equilibrium toward product formation, thereby significantly enhancing the overall yield of 3-phenyl-2-oxazolidinone. Additionally, P-TBTOD-1/1/2 exhibited outstanding stability, maintaining the yield of 3-phenyl-2-oxazolidinone almost unchanged after five consecutive runs. These findings indicate that P-TBTOD-1/1/2 is a promising candidate catalyst for CO2 utilization.
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TRIBOLOGY INTERNATIONAL
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2024
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IF 6.1
Bingyu Tian,Fan Xu,Kun Cui,Mengyao Liu,Yingying Yao,Ping Wen,Rui Dong,Mingjin Fan
Polyethylene glycol (PEG) system behave the characteristics of non-toxic, non-irritating and good compatibility with various substances, so the improvement and stability of lubrication property and comprehensive performance is vital for PEG system under harsh working conditions. Here, highly reactive ionic liquids (ILs) are designed and introduced with a specifically designed molecular structure, the ultra-short running-in period and robust lubricity can be obtained by dynamic disulfide and hydrogen bonds from the constructed IL-PEG200 lubrication system. Combined with analytical techniques (XPS, FIB-TEM, Nanoindentation, Raman, TOF-SIMS), their interaction was explored to further clarify the interfacial self-assembly behavior. The superior bearing capacity is mainly ascribed to the synergistic effect of carbon-like film, dynamic disulfide bond, hydrogen bonding and interfacial tribochemical reaction.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Fangfang Li,Jingya Kong,Ziyuan Fang,Laili Wan,Jing Gu,Changchun Ji,Ying-Hua Zhou
The catalytic transformation of epoxides into cyclic carbonates offers a promising strategy to mitigate excessive CO 2 emissions while producing valuable chemicals. However, attaining high catalytic efficiency and selectivity with MOF-based catalysts under mild conditions continues to be a significant challenge. Additionally, many existing catalytic systems rely on cocatalysts or solvents, compromising sustainability and practicality. In this study, a series of alkyl chain-tunable Zr-MOF catalysts, denoted as TCPP-UiO-66-PDC-DIL(R) (R = Et, Pr, Bu, Pe), were synthesized via a two-step approach. Initially, Zr 4 + ions were coordinated with meso-tetra(4-carboxyphenyl) porphine (TCPP) and 2,5-pyridine dicarboxylic acid (PDC) to create TCPP-UiO-66-PDC. Subsequently, dicationic ionic liquids (DIL) with varying alkyl chains lengths were decorated through post-synthetic modification. Their catalytic performance was assessed for CO 2 -epoxide cycloaddition without the use of cocatalysts or solvents. Among them, TCPP-UiO-66-PDC-DIL(Bu) exhibited the best catalytic performance, achieving a 98 % yield for producing chloropropene carbonate at a low CO 2 pressure (1.0 bar) within 12 h. This exceptional activity was attributed to the synergistic interplay of Lewis-acidic Zr 4+ nodes for epoxide activation, the porphyrin moiety of the TCPP ligand enhancing CO 2 adsorption, and the strong nucleophilicity of bromide anions in DIL to facilitate the halide ion-mediated nucleophilic attack on the epoxide-CO 2 adduct. Additionally, the catalyst demonstrated superior universalities toward other substrates and recyclability. These findings expand the potential of the multifunctional MOF-based heterogeneous catalysts, enhancing their efficiency and sustainability for use in CO 2 conversion.
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ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Xiaoyi Xu,Tingting Zhou,Yu Bing,Xukun Wang,Hongtao Jiang,Zhao Song,Tong Zhang
Real-time monitoring of carbon dioxide (CO 2 ) is imperative for medical diagnosis and effective environmental preservation. Despite the formidable challenge posed by the inherent chemical inertness of CO₂ molecules, a pioneering CO 2 sensor based on MOF-804 cofunctionalized with ionic liquid (IL) and m-cresol purple (mCP) is successfully developed. By ingeniously integrating hydrogen bonding, electrostatic interactions, and hydrophobic properties within the sensitive layer, the sensor achieves a state-of-the-art sensitivity (Δf = 384 Hz), an exceptionally vast detection range spanning 400–80 000 ppm, and remarkable stability with minimal sensitivity drift even at relative humidity (RH) levels exceeding 80%. Furthermore, the inherent gasochromic property, stemming from the zwitterionic mechanism, paves the way for innovative self-sustaining CO 2 test strips and groundbreaking applications, including CO 2 tracking and CO 2 -encrypted security labeling technology. Collectively, the realization of this ultra-sensitive and robust CO 2 monitoring approach, coupled with its CO 2 -triggered visual and multifunctional capabilities, opens up novel avenues for dynamic CO 2 detection, advanced military encryption strategies, and enhanced health management systems.
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ACS Nano
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2025
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IF 16
Aiqin Gao,Mingxiao Jing,Jiahui Liang,Changwu Zheng,Teng Ma,Xiyu Song,Aiqin Hou,Kongliang Xie
Designing smart molecular nanogels and nanogel actuators that can intelligently change the surface activity and controllably adjust the nanogel molecular arrangement has been a major challenge in the field of smart materials. Here, a series of ionic liquids composed of imidazolium ionic headgroups, alkyl chain spacers, and a photoresponsive azobenzene unit were designed. They can form smart ionic liquid nanogels with low melting points and construct smart nanogel actuators by light-trigger. The intelligent ionic liquid nanogels can be used to construct stable oil–water smart emulsions with photocontrollable actuators, which have the ability of reversible emulsification and demulsification triggered by light. The intelligent emulsions are applied to efficiently extract cinnamon oil from biomass cinnamon bark by a solvothermal method at low temperature. Cinnamaldehyde can be efficiently separated using intelligent reversible demulsification by the photocontrollable actuator. Cinnamaldehyde with a high purity of 97.21% can be obtained by the smart nanogel actuator. In a single extraction, the distributions of the smart ionic liquid in the water phase, the oil phase, and the cinnamon phase are 0.99%, 8.19%, and 90.82%, respectively. The total recovery rate of the smart ionic liquid is 95.53%. After three cycles, the extraction rate of cinnamon remains at 92.67%. 2D correlation FTIR spectra, 1H NMR, and DFT calculations indicate that the constructed ionic liquid nanogels have strong supramolecular interaction with lignin macromolecules, the special ability to disassemble hydrogen bonds on lignin, and the ability to quickly swell lignin fibers. The smart ionic liquid nanogel actuator provides an advanced platform for efficient extraction of sensitive compounds and smart oil–water separation.
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ELECTROCHIMICA ACTA
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2025
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IF 5.6
Xiying Tang,Le Guo,Wenli Qiao,Leina Jia,Wenming Jin,Xinsheng Liu,Yonghong Li
A label-free Helicobacter pylori ( H. pylori ) VacA antibody immunosensing platform based on silver nanoparticles doped reduced graphene oxide/ionic liquid composites electrode (Ag@rGO/CILPE) was successfully prepared. Ag@rGO/IL nanocomposites not only enhanced the immobilization capacity for VacA antigen but also improved the response signal of the immunosensor, it could achieve selective recognition for VacA antibody. The linear range of VacA antibody was 0.01-1 ng mL -1 using the proposed method, with a detection limit of 5 pg mL -1 . The constructed immunosensor had good specificity, reproducibility, and stability. It could be used for the determination of VacA antibody in human serum samples, achieving the typing diagnosis of H. pylori infection.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2025
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IF 2.9
Shuyan Liu,Xiuyu Du,Kuan Ji,Lili Lv,Yu Zhou
Ionic liquids (ILs) are highly effective entrainers for extractive distillation of azeotropes, owing to their unique physicochemical properties. However, the intrinsic molecular mechanisms underlying the role of ILs in azeotropic separation process remain insufficiently understood. To investigate the intrinsic causes of the azeotropy elimination by ILs, the study focused on the v(O−D) region of the ethanol employing both experimental and theoretical methods to investigate the microstructural properties of the ethyl propionate (EP)−ethanol azeotrope before and after separation by the 1-hexyl-3-methylimidazole acetate (HMIMOAc). The key findings are as follows: (1) The interaction between HMIMOAc and ethanol issignificantly stronger than that between EP and ethanol. (2) The interaction between [OAc]− in HMIMOAc and ethanol plays a critical role in eliminating the azeotropy. (3) Ethanol self-aggregates, EP−ethanol interaction complexes, and HMIMOAc−ethanol interaction complexes, were identified andcharacterized using excess spectroscopy and quantum chemical calculations.
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