RSC Advances
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2015
·Vol. 5
·期 101
·82789-82799
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IF 3.84
Yudi Guo,Dongyan Tang,Erqing Zhao,Zaiqian Yu,Haitao Lv,Xinyu Li
Effective surface fluorine enrichment has great potential application value for superhydrophobic electrospun films, which has presented a challenge to researchers. The aim is expected to be achieved by electrospinning functional polymers with controlled structure based on the polarization characteristics of functional groups in polymer chains and their directional ordering induced by an electric field. Herein, an amphiphilic graft copolymer of poly(methyl methacrylate-ran-hydroxypropyl acrylate)-graft-poly(dodecafluoroheptyl methacrylate) (PMMA-r-PHPA-g-PDFMA) was synthesized by the combination of free radical polymerization and atom transfer radical polymerization (ATRP). Superhydrophobic fibrous films with high surface fluorine atomic content of 29.1% and even up to 34.8% were fabricated by eletrospinning the resultant fluoropolymer. It is concluded that the electric field can drive the surface segregation of positively charged fluorinated groups and bulk segregation of negatively charged –OH groups, thus contributing to the effective surface fluorine enrichment, which was confirmed by XPS results. Additionally, we also found that the superhydrophobicity of electrospun films has no apparent dependence on fibre morphologies. The variation in the surface wettability can be attributed to the difference in surface compositions obtained by changing the applied electric field strength and solvents. This research would present potential application prospects in fabricating high surface fluorinated superhydrophobic electrospun fibres or novel surface functionalized electrospun fibres.
研究领域:
材料科学
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高分子化学
·
表面科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Yunyu Zhao,Yingjian Yu
Aqueous zinc metal batteries (AZMBs) are a promising alternative for next-generation secondary batteries owing to their high safety, low cost, and high electrical capacity. However, issues such as corrosion and dendrite growth on zinc anodes hinder the practical application of AZMBs. In this study, we developed two two-dimensional fluorine-rich covalent organic frameworks (COFs), TpFPa and TpFBD, as protective layers for the AZMB anode. The fluorine-rich hybrid interface composed of COFs@Zn and ZnF 2 , produced during Zn electroplating, promoted Zn 2+ dissolution and homogenized the Zn 2+ flux. These effects effectively inhibited side reactions and Zn dendrite growth. In addition, the uniform and dense COFs prevented direct contact between Zn and the electrolyte, which improved the corrosion resistance of the zinc anode. Thus, the symmetric cells assembled using COFs@Zn demonstrated a stable cycle performance of over 1680 h at 1 mA cm −2 @1 mAh cm −2 , which significantly surpassed the performance of bare zinc symmetric batteries. In addition, full cells protected by COFs maintained an ultra-long cycle stability of over 3500 cycles at 2 A g −1 . This strategy of developing a fluorinated artificial interface layer represents a promising approach for designing high-performance AZMBs.
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Mingyue Wang,Quan Zhou,Lingling Li,Qiuyi Liu,Min Wang,Yue Lan,Yuqiang Xiao,Jiaqi Hu,Zhangyong Song,Famin Ke,Xiurong Guo,Dandan Wang,Die Gao
Glucocorticoids possess extensive and potent pharmacological effects, but their misuse and overuse are widespread concerns. Consequently, the environmental pollution and health hazards associated with their excessive usage cannot be overlooked. There is an urgent need for enhanced removal and a thorough understanding of the environmental and safety risks arising from the overconsumption of these drugs. In this study, a novel F, N-enriched covalent organic framework (designated as TAPT-COF) with high crystallinity was synthesized. TAPT-COF features numerous active sites, including F-F interaction and hydrogen bond interaction sites, along with a high specific surface area and good thermal stability. These characteristics enable TAPT-COF to serve as an advanced adsorbent for dispersed solid-phase extraction (D-SPE) of glucocorticoids such as fluocinonide acetate, budesonide, and dexamethasone, with adsorption capacities ranging from 146.77 to 228.90 mg·g⁻¹ . Notably, TAPT-COF exhibits exceptional protein exclusion efficiency, achieving exclusion rates exceeding 95 %. Due to these advantages, TAPT-COF based D-SPE demonstrates strong applicability in the analysis of complex practical samples, including water and plasma, with satisfactory recoveries ranging from 76.48 % to 112.76 %. Compared to a COF (TPB-COF) that lacks a triazine group, TAPT-COF exhibits superior adsorption performance for target glucocorticoids. This is attributed to its ability to provide enhanced electrostatic interactions, as well as the synergistic effects of hydrogen bonding and F-F interactions. Additionally, TAPT-COF displays a low hemolytic activity, indicating its potential for in vivo analysis.
研究领域:
环境科学
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药物分析
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yichao Chen,Ruidong Ming,Jingyi Wang,Zhuohao Bao,Linxin Lu,Zhengliang Du,Yiheng Song,Xianze Yin,Xianjie Wen
Addressing industrial fluorine waste disposal while enhancing fluorinated triboelectric materials constitutes dual critical challenges. By compounding oxygen-free CaF 2 nanoparticles synthesized from solidified fluoride ions with PVDF, this study achieves simultaneous environmental remediation and triboelectric enhancement. The synergistic mechanisms include: (1) Intrinsic negative triboelectric polarity enhancement (work function increased from 4.97 to 5.31 eV); (2) Aggregated state modulation ( β -phase: 76.8 % to 90.8 %; crystallinity: 43.5 % to 48.9 %); (3) Interfacial polarization (>25 % dielectric constant increase at 1 kHz). The 20 wt% CaF 2 /PVDF composite film exhibits 128 V open-circuit voltage, 43 nC transferred charge, and 403.3 mW/m 2 power density - representing 2.79-fold enhancement over pure PVDF. The composite maintains >95 % output stability through 3000 bending cycles and functions effectively as wearable strain sensors for human motion monitoring. This integrated strategy establishes a sustainable paradigm merging waste valorization with high-performance triboelectric material design.
研究领域:
材料科学
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纳米技术
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能量收集
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可穿戴电子
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环境修复
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聚合物复合材料
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）