SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yaran Yin,Taotao Fu,Chunying Zhu,Rongwei Guo,Youguang Ma,Huaizhi Li
The evolution of the size and velocity of CO 2 bubble absorbed into MEA/[Bmim][BF 4 ] aqueous solutions was in-line investigated by a high-speed camera. The coupling effect between the variation of volume and the velocity of bubbles was highlighted. According to the evolution of average mass transfer coefficient, the mass transfer performance in the whole flow process was studied. The results indicated that both the length and velocity of bubble decreased gradually in the flow process due to mass transfer. A linear correlation between the relative velocity (the ratio of average bubble velocity to two-phase superficial velocity) and the relative lost length (the ratio of the lost length to the initial length) was proposed. The increase in overall liquid-phase volumetric mass transfer coefficient ( k L a ) at higher gas flow rate could be ascribed to the shorter residence time and larger specific surface area. While the increase of k L a at higher liquid flow rate and MEA or [Bmim][BF 4 ] concentration was resulted from intensified mass transfer. An empirical correlation of overall liquid-phase volumetric mass transfer coefficient was proposed taking the gas-phase Reynolds number, liquid-phase Reynolds number and Damköhler number into account.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Wei Zhai,Hua-jun Zhu,Long Wang,Xiao-min Liu,Hui Yang
The ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF 4 ) is selected as plasticizer to prepare a series of novel gel polymer electrolytes due to its non-volatility and inflammability. The micro-porous matrix employed in this study is poly(vinylidene fluoride-co-hexafluoropropylene)/poly(methyl methacrylate) (PVDF-HFP/PMMA) membrane synthesized via phase inversion. The effect of the ratio of PVDF-HFP to PMMA on the properties of the micro-porous membrane, such as morphology, porosity and the liquid uptake capability are systematically studied. Thermal and electrochemical properties of the resulting gel polymer electrolyte are also studied with the objective to optimize the quality of the micro-porous gel polymer electrolyte. The results indicate that the micro-porous gel polymer electrolyte MIL-60, derived from the matrix of PMMA-60 (40 wt% PVDF-HFP and 60 wt% of PMMA), presents the lowest glass transition temperature and exhibits the highest ionic conductivity . The LiFePO 4 /MIL-60/Li coin-typed cell cycled at 0.1 C shows the 1 st discharge capacity up to 157 mAh·g −1 , and remains 151 mAh·g −1 on the 50 th cycle.
研究领域:
材料科学
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电化学
·
能源存储
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Jing Xie,Lin Li,Jianlei Qi,Xuehai Wang,Haocheng Sun,Jianzhong Yin
The chemical recycling of polyethylene terephthalate (PET) faces challenges such as low depolymerization efficiency, harsh reaction conditions, and low product selectivity. In this study, 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4 ) ionic liquid (IL) was developed as a catalyst for methanolysis, achieving the efficient conversion of PET into the target monomer dimethyl terephthalate (DMT). The effects of temperature, time, IL amount, and methanol quantity on the reaction were systematically investigated. The degree of depolymerization and catalyst stability were systematically evaluated by multiscale characterization (spectroscopy, chromatography, thermal analysis, etc.). Experimental results indicated that when the PET/[Bmim]BF 4 ratio was 6:1 and the PET/methanol ratio was 1:6 (mass ratio), reaction at 200°C for 2 h, PET was completely converted (100%), and the yield of DMT reached 82.26%. [Bmim]BF 4 could be reused more than five times without significant decrease in PET conversion. The kinetic results showed that the reaction was in line with the first-order kinetic model, and the apparent activation energy was about 43.24 kJ/mol. DFT calculations suggested that [Bmim]BF 4 efficiently catalyzed the reaction by lowering the energy barrier of the key transition state. This study provides a solution with both high efficiency and industrial potential for the green chemical recycling of PET. Graphical The methanolysis of polyethylene terephthalate (PET) was catalyzed by 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) at 200°C for 2 h, achieving PET conversion (100%) and 82% yield of dimethyl terephthalate (DMT).
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yuewen Chen,Tao Zheng,Hai Liu,Weidong Xie,Jiali Huang,Yimin Wang,Xiya Zhang,Zhen Yuan,Zhile Xiong
The electrocatalytic reduction of CO 2 to CO represents an important approach for carbon resource utilization. However, most existing catalysts still suffer from low activity and poor selectivity. In this work, a novel “domain-confined interface” synergistic catalytic system was constructed by integrating ionic liquid [BMIM][BF 4 ] with zeolitic imidazolate framework-8 (ZIF-8) to enhance the CO 2 reduction reaction (CO 2 RR) performance. The high specific surface area and microporous structure of ZIF-8 provide an ideal platform for CO 2 adsorption and activation, while [BMIM][BF 4 ] improves the local microenvironment of the catalytic interface, thereby boosting the catalytic activity. Experimental results indicate that the incorporation of the ionic liquid significantly enhances the CO 2 RR performance of ZIF-8 at low potentials. The Faradaic efficiency for CO (FE CO ) increases from 38.98 % to 75.25 % at −0.8 V versus the reversible hydrogen electrode (RHE). Moreover, at the optimal potential of −1.2 V (vs. RHE), FE CO reaches 96 % and remains stable during an 8-hour durability test, outperforming most reported ZIF-8-based catalysts. This work may provide useful insights for the design of efficient CO 2 RR electrocatalysts.
研究领域:
电催化
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材料科学
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二氧化碳利用
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可持续能源
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产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Jiangnan Yan,Jianing Ding,Hongyu Yi,Yifan Gao,Kongyu Ge,Hongjun Ji,Mingyu Li,Huanhuan Feng
Electronic skin (e-skin) holds significant potential for applications in health monitoring, human–machine interface, and motion recognition. However, conventional e-skins often exhibit decreased sensitivity and delayed response in low-temperature environments due to the freezing of conductive materials. To solve this, a flexible e-skin suitable for low-temperature environments was fabricated by selecting the ionic liquid [BMIM]BF4 as the conductive medium. Unlike liquid metals and hydrogels, ionic liquids can serve as conductive media with ultralow melting points and high conductivity by selecting appropriate cation–anion combinations. The [BMIM]BF4 we selected maintains high conductivity even with an ultralow melting point of −71 °C, which enables the fabricated flexible sensors to exhibit outstanding pressure-sensing performance under low-temperature environments. The e-skin can accurately respond to pressure loads (100–10,000 Pa), with linear resistance response. In addition, the e-skin maintains stable sensing performance in various curved environments and retains its normal sensing capability for external loads at temperatures as low as −50 °C. Furthermore, it possesses excellent dynamic sliding trajectory recognition capabilities, enabling the simultaneous identification of trajectories from multipoint sliding. To further enhance the three-dimensional microscale sensing capabilities of the e-skin, micropyramids were introduced onto its surface. The micropyramid-decorated e-skin can accurately achieve real-time dynamic detection of height at −10 °C, with a detection error of less than 2%. Therefore, the e-skin can accurately recognize microscale three-dimensional surface morphologies at −10 °C. Moreover, this e-skin can be applied in the field of Braille detection. It exhibits good recognition and reading capabilities for standard Braille currently in use and can identify various complex Braille letters.
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 10
·12909-12917
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IF 3.056
Ren Jingyu,Li Jie,Lv Lei,Wang Jian
Ionic liquids (ILs) are a kind of promising extractants for removing undesirable organics from industrial wastewater and crude oil, etc. Herein, IL regeneration by ozonation was proposed for its recycling. 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4 ) and phenol were used as the representative IL and organic matter, respectively. The regeneration performance, stability of [Bmim]BF 4 , and roles of hydrogen bonds between O 3 and [Bmim]BF 4 in the phenol removal were studied. The experimental results showed that 90.2% of phenol was degraded in [Bmim]BF 4 after ozonation treatment for 30 min with the O 3 concentration of 1.2 mg/L. The nonvolatility of [Bmim]BF 4 -made phenol was adequately degraded, while the concentration of phenol increased during ozone treatment in the conventional extractants (ethanol, ethyl acetate, and dichloromethane) due to their high volatility. The reuse experiments, spectra of Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy indicated that [Bmim]BF 4 was steady under the ozonation process. Density functional theory simulation confirmed that hydrogen bonds between [Bmim] + and O 3 could be formed, and calculational results of Hirshfeld charges indicated that the nucleophilicity of O 3 was enhanced by the hydrogen bonds. The enhanced nucleophilicity resulted in the increase of phenol degradation efficiency by ozonation, and the synergistic effect between O 3 and ILs was proportional to the hydrogen bond donor ability of ILs.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2021
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IF 7.267
Juanxuan Guo,Fangxian Wang,Shihao Li,Yuwei Wang,Xueshan Hu,Daoyuan Zu,Yongming Shen,Changping Li
A solar-thermal utilization heat transfer fluid with excellent light-to-heat conversion performance and good thermal reliability at high temperature is highly desirable for direct absorption solar collector (DASC). To obtain IL-based nanofluids as suitable HTFs for medium-high temperature DASCs, GO , MWCN and Ti 3 C 2 were selected as nanoadditives , respectively. The result shows that the light-to-heat conversion efficiency of Ti 3 C 2 /[BMIM]BF 4 nanofluid is 20% and 29% higher than that of GO/[BMIM]BF 4 nanofluid and MWCN/[BMIM]BF 4 nanofluid, respectively, after irradiation for 1000 s, due to the excellent optical absorption performance of Ti 3 C 2 . Furthermore, the effects of mass fractions of Ti 3 C 2 , solar concentrations and DASCs heights on the light-to-heat conversion performances of Ti 3 C 2 /[BMIM]BF 4 nanofluids are investigated systematically. The light-to-heat conversion performances of Ti 3 C 2 /[BMIM]BF 4 nanofluids rapidly increase with the increase of mass ratios of Ti 3 C 2 owing to the outstanding broad-spectrum absorption properties (250–2100 nm) of Ti 3 C 2 . Moreover, the light-to-heat conversion performances of Ti 3 C 2 /[BMIM]BF 4 nanofluids in DASCs increase with the increase of solar concentrations and DASCs heights. Additionally, the light-to-heat conversion efficiency of 0.04 wt% Ti 3 C 2 /[BMIM]BF 4 nanofluid is 2.7 times that of the pure ionic liquid at solar concentration C = 2.5, DASCs height H = 2.5 cm and 6500 s of irradiation. The obtained high-performance Ti 3 C 2 /[BMIM]BF 4 nanofluids show great potential application as advanced heat transfer fluids (HTFs) for DASCs.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Hongwei Zhang,Dong Yang,Qiang Long,Zihao Yan,Huishan Zhang,Tianxu Zhang,Yanbo He,Xin He,Weiqiang Hong,Yunong Zhao,Xiaohui Guo
In recent years, despite the extensive evolution of capacitive flexible pressure sensors, conventional capacitive pressure sensors are constrained by structural hardening, resulting in a limited pressure-response range. Here, an iontronic flexible pressure sensor based on a multistage gradient micro-dome structure was reported. The multistage gradient structure not only enhances the compressibility of the device, but also reduces the initial contact area. In addition, the sensor uses AgNWs as electrode materials to ensure that excellent electrical conductivity is maintained over a certain strain range, while polyvinyl alcohol and [BMIM]BF4 are employed as ionic layers to improve the performance of the ionic materials. The sensor achieves a maximum sensitivity of 8.1 kPa−1 within a pressure range of 2.1 Pa–600 kPa, and a fast response/recovery time of 25/20 ms. Moreover, it repeats compression/release 3000 times at a pressure of 26 kPa without significant signal drift. The sensor can identify different sitting positions and monitor laryngeal activity in wearable devices with strong repeatability and dynamic response recovery, enabling users to adjust incorrect sitting postures in a timely manner.
研究领域:
电子学
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材料科学
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可穿戴技术
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生物医学工程
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产品关联
DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 9
·682
·
IF 5.3
Mariia Kazharskaia,Yu Yu,Chenguang Liu
This study presents an innovative iontophoretic delivery system for glycolic acid (GA) based on polysaccharide microbeads embedded within an electrolyte hydrogel. The mi-crobeads, fabricated using a peristaltic pump, exhibited a uniform morphology with an average diameter of 1078 ± 140.38 μm and were successfully integrated into a hydrogel matrix (thickness: 4542.55 ± 337.24 μm). Comprehensive physicochemical characterization (FT-IR, XRD, SEM) confirmed effective component integration. The hydrogel demonstrated optimal mechanical properties with a tensile strength of 0.02 ± 0.003 MPa and reliable adhesion to various substrates, while maintaining excellent self-healing capabili-ties—post-repair conductivity remained sufficient to power an LED indicator. The material demonstrated favorable conductivity under various storage conditions while maintaining non-cytotoxic properties. Notably, microbead incorporation preserved electrochemical performance, as demonstrated by stable behavior in cyclic voltammetry using an Ag/AgCl reference system. Iontophoretic testing revealed significantly enhanced glycolic acid delivery at −1.0 V com-pared to passive diffusion. The system, combining PVA, PAA, alginate, [Bmim]BF4, and E. prolifera polysaccharides with gellan gum, shows strong potential for advanced cosmetic dermatology applications requiring precise active ingredient delivery.
研究领域:
药剂学
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透皮给药
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生物材料
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美容皮肤科学
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高分子科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yong Gao,Changsheng Sun,Chenze Qi
Room temperature ionic liquids (RTILs)-containing Pickering emulsions exhibit promising application potentials because of the integration of the “green” quality and the tunable applications of RTILs with the advantages of Pickering emulsions, such as the high stability and adjustable droplet size. In the present study, sterically-stabilized polymer nanoparticles (SSPNs) were first prepared via the reversible addition-fragmentation chain transfer (RAFT)-mediated non-aqueous dispersion polymerization , in which poly(lauryl methacrylate) (PLMA) and poly(4-vinyl pyridine) (P4VP) acted as the stabilizer block and the core-forming block, respectively. Kinetically-trapped PLMA- b -P4VP spheres and mixed spherical/worm-like morphologies could be achieved at a target copolymer composition . Subsequently, core cross-linked SSPNs (CSSPNs) were obtained by means of chemical cross-linking of P4VP cores of SSPNs with 1,4-dibromobutane in a diluted solution of SSPNs in toluene (0.4 mg/mL). Stable 1-butyl-3-methylimidazolium tetrafluoroborate-in-toluene ([Bmim][BF 4 ]-in-toluene) non-aqueous Pickering emulsions could be formed at a low emulsifier content of 0.005 wt% adopting CSSPNs with mixed spherical/worm-like morphologies as Pickering emulsifiers. Benefiting from large surface areas of Pickering emulsions and unique chemical/physical properties of RTILs, [Bmim][BF 4 ]-in-toluene Pickering emulsions provided readily available platforms for many organic reactions . As a proof of the concept, proline catalyzed Knoevenagel reaction of 4-nitrobenzaldehyde with malononitrile was chosen as a model here. Both high reaction efficiency and good recyclability were observed.
研究领域:
材料科学
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化学工程
·
有机化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）