IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
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2025
·
IF 3.1
Kaixuan Sun,Haoxuan Sun,Xianghan Du,Zixuan Zhao,Geng Chen,Fangcheng Lv,Xiang Yu
Poly(m-phenylene isophthalamide) (PMIA) is renowned for its superior insulating and mechanical properties, holding immense promise in ultra-high voltage transmission systems. To further enhance the mechanical robustness of nanofiber-based paper, microfibers have been employed as reinforcement fillers. However, interfacial issues have emerged as a challenge, compromising the insulation properties. In this work, we present the realization of synergistically enhanced breakdown strength and mechanical properties in the PMIA micro-nano composite paper, achieved by interface fluorination treatment. With an optimized fluorination time of 60 s, the composite structure becomes more compact, greatly enhancing its overall integrity. The fluorine-rich interface provides potential electron traps and hydrogen bond sites, which play a crucial role in enhancing both electrical insulation and mechanical properties. The breakdown strength is increased by 19.5%, achieving a high value of 295.6 kV/mm. Concurrently, Young’s modulus and tensile strength are enhanced to 4.04 GPa and 24.38 MPa with increases of 32.9% and 14.8%, respectively. However, it is noteworthy that excessive plasma fluorination can induce surface structural damage to microfibers, impeding the adhesion of nanofibers. It leads to a deterioration in both electrical and mechanical properties. Moreover, the optimized paper shows exceptional flexibility, foldability, and colorability, opening new avenues for their utilization in demanding electrical environments.
研究领域:
材料科学
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电气工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
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IF 3.42
Wentao Li,Wenjie Zhao,Lisha Mao,Shengguo Zhou,Chao Liu,Zhiwen Fang,Xiulei Gao
In this work, fluorinated graphene (FG) nanosheets with different F/C fluorination degree were synthesized by a convenient gas phase fluorination method. Ionic liquids was used to modify the FG to improve its dispersion and compatibility in polyimide (PI). The thermal, mechanical and tribological properties of FG/PI composite coatings were investigated systematically. The morphology of FG was observed by Transmission electron microscopy (TEM) and scanning probe microscope (SPM). The physical and chemical properties of the FG were characterized by a large number of measurement methods, such as X-ray powder diffraction (XRD), Raman spectra, X-ray photo-electronic spectroscopy (XPS) and so on. Fourier transformed infrared spectra (FTIR) was used to confirm the successful modification of ILs. And the Chemical composition of the PI coating was investigated by XPS and FTIR measurements. On the basis of the stable dispersion of FG in the PI matrix, compared with pure PI, the composite coating with (reduced graphene oxide) rGO owned slightly improved thermal, mechanical and tribological properties and the composite coating with FG displayed significant improvement, especially when the F-doped degree was the highest.
研究领域:
材料科学
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表面工程
✓ 已验证
DOI
高影响因子
BIODEGRADATION
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2021
·Vol. 32
·期 1
·99-112
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IF 3.909
Qiao Weichuan,Miao Jiahui,Jiang Hongmei,Yang Qiwen
Perfluoroalkyl carboxylates (PFCAs) is toxic to the environment and human health. However, the degradation characteristics of fluorotelomer alcohols (FTOHs), precursors of PFACAs biodegradation, in the sludge during aerobic composting remain unclear. In this study, the degradation characteristics of 6:2 FTOH in sewage sludge by composting were researched and the influences of 6:2 FTOH on the composting process and microbial communities of the sludge were evaluated. After 52 days of composting, 6:2 FTOH retained only 0.73% of its original concentration, and its half-life was less than 1 d; 6:2 FTOH was degraded finally to perfluorohex unsaturated acid, perfluoropentanoic acid, 5:3 polyfluorinated acid (FTCA), 4:3 FTCA, and perfluorobutanoic acid through two pathways; and 6:2 FTCA and 6:2 fluorotel unsaturated acid were the intermediate products. Notably, dosing with 6:2 FTOH affected the composting process of sewage sludge. Additionally, 50 mg/kg 6:2 FTOH resulted in a decrease in the microbial richness and diversity of sludge compost. When compared with the compost without 6:2 FTOH, the proportion of Proteobacteria had increased, and the proportion of Firmicutes had decreased as the concentration of 6:2 FTOH increased. The negative effect of a dosage of 50 mg/kg 6:2 FTOH was more obvious than the effect of other treatments. This study expanded our understanding of the risk of sludge contaminated by 6:2 FTOH being used as a fertilizer after composting.
研究领域:
环境科学
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废物管理
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微生物学
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Yi Gu,Qiulan Li,Mengjia Yin,Dezhi Yang,Yaling Yang
In this paper, a hydrophobic substrate as concentrators including an inner layer of polytetrafluoroethylene (PTFE) and an outer layer covered a thin layer of perfluoropolyether (PFPE) was constructed to achieve a higher sensitivity for acetamiprid (AC) SERS detection. The condensation effect of the PTFE-PFPE hydrophobic substrate-induced aggregation of gold nanoparticles (Au NPs) result ‘‘hot spots’’ for SERS. The hydrophobic substrate is better reproducibility (RSD < 5%) compared with that on a conventional silicon wafer. A further application of the hydrophobic substrate was demonstrated by the detection of AC in tea samples within a detection range of 0.03 mg/L to 3 mg/L. The hydrophobic substrate eliminates the problem of solution diffusion to avoid the “coffee ring” effect (When a droplet adheres to a solid surface, the suspended molecular particles usually deposit on the edge of the droplet to form a ring).
研究领域:
分析化学
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材料科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2020
·Vol. 326
·期 1
·575-581
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IF 1.137
Cai Fei,Yan Heng,Fan Wenbin,Li Shihong,Xu Jianfeng,Wang Zheng,Tang Xiaobin
A mild HPLC method for the quality control of [ 18 F]sodium fluoride solution for injection was developed. The method used anion exchange column for separation, UV and online radio-detectors for fluoride content and fluorine-18 determination. A mixture of 100 mM sodium acetate and 25 mM sodium chloride was chosen as mobile phase. The method was validated for system suitability, specificity, fluoride concentration and radiochemical purity determination with good linearity, accuracy and precision. The good robustness of the system was also verified, enabling routine analysis of fluoride content and radiochemical purity of the [ 18 F]sodium fluoride product.
研究领域:
药学
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核医学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Runfa Liu,Yue Pan,Jia Zhang,Xincui Zhuang,Yangbo Wang,Xufeng Zhou,Shanshan Du,Huaiyong Li,Wei Li
Ratiometric luminescence thermometry is awfully applicable for non-contact temperature detection. Lanthanide luminescent materials available for high-performance ratiometric thermometry are still highly desirable until now. Herein, two novel upconversion phosphors, Yb 3+ /Ho 3+ co-doped BiOF and BiF 3 microcrystals , were synthesized and investigated systematically in terms of their crystalline structure, room temperature and temperature-dependent upconversion properties. Under 980 nm laser excitation, both microcrystals bring forth the characteristic emissions of Ho 3+ , with an identical overall luminescent color of green, while the intensity is much higher in BiF 3 :Yb/Ho microcrystals. When increasing temperature, the upconversion intensity at various wavelengths for both microcrystals is reduced, meanwhile fluorescence intensity ratios of both 545/656 nm and 752/656 nm decrease highly regularly, establishing a ratiometric thermometry therefore. BiF 3 :Yb/Ho microcrystals were demonstrated to have significantly superior thermometric performance than BiOF:Yb/Ho, and a high relative sensitivity up to 5.41% K −1 as well as a wide temperature sensing range of 298–673 K were obtained.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
Environment & Health
·
2025
·
IF 6.3
Chuanzi Gao,Feng Quan,Wenhui Qiu,Yi Zheng
This study investigates the presence and health implications of per- and polyfluoroalkyl substances (PFAS) in human serum samples collected from white-collar workers in an industrialized region of China. Our research offers fresh insights into the underexplored area of nonoccupational PFAS exposure among white-collar workers, shedding light on health risks linked to industrial PFAS pollution. Seven PFAS compounds were measured. Perfluorooctanoic acid (PFOA) and perfluorooctanesulfonate (PFOS) emerged as predominant pollutants, with Σ7PFAS concentrations averaging 65.486 ng/mL. Gender differences showed higher serum Σ7PFAS levels in males, and age-related analyses suggested PFAS accumulation over time, with higher concentrations in older groups. Additionally, significant correlations were found between PFAS concentrations and biomarkers of oxidative stress and immune interference, specifically malondialdehyde (MDA) and immunoglobulin M (IgM), indicating that PFAS exposure may contribute to oxidative damage and potential immunosuppression. The study highlights regional and international variations in PFAS serum concentrations, underscoring the influence of industrial activities on PFAS exposure and expanding on the established links between PFAS exposure and health outcomes. These findings call for targeted strategies to mitigate PFAS exposure in high-risk regions and warrant further research on PFAS health impacts, especially in regard to immune interference.
研究领域:
环境科学
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公共卫生
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免疫学
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流行病学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
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2020
·Vol. 7
·期 7
·075305
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IF 1.929
Guangtao Chang,Lei Chen,Zhanxiong Li
In this study, one novel perfluoroalkyl silane with tetrafluoro-λ6-sulfanyl bridging group named 4-(Tridecafluorohexyl sulfur tetrafluoride) Phenylethyl trichlorosilane (PFSTS) was successfully synthesized via fluorination and hydrosilylation. The structure was characterized by FT-IR and NMR Then, the product and the control subject 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOTS) were finished onto PET fabrics through the method of dip-and-pad. The wettabilities of the treated PET fabrics were characterized by Water Contact Angles (WCA) and surface free energies measurements. X-ray Photo electron Spectroscopy (XPS) was used to validate the attachment, together with the chemical composition of the polymers on the surface of treated PET fabrics. The WCAs of PFOTS@PET and PFSTS@PET were 142.2°, 137.3°, while the WCA of untreated PET fabrics is 120° in general, indicating that PFTOS and PFSTS can provide good hydrophobicity by finishing PET fabrics. After the 48 h exposure to accelerated agingUV irradiation, sample of PFSTS@PET show a decreased CA value by 12.5% from 137.3° to 120.1°, while for sample of PFOTS@PET, the percentage of reductionis only 2.8%. It was found that the perfluoroalkyl trichlorosilane that containing –SF4– bridged group exhibited excellent water-repellency properties and had higher potential to UV degrade as possessing weak bond energy of C–S bond, so the PFSTS might act as an eco-friendly alternative to carbon-chain perfluoroalkyl derivatives in water-repellency areas.
研究领域:
材料化学
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纺织科学
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表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2016
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IF 0.661
Haidong Liu,Bo Chen,Jin Cai,Junqing Chen,Min Ji
Eleven trifluoromethylated amines were synthesised in high yield (up to 98%) under metal-free and oxidant-free conditions using iminium salts as starting material and the addition of trifluoromethyltrimethylsilane in dimethylformide containing potassium fluoride.
研究领域:
有机化学
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合成化学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
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2025
·
IF 2.7
Jiying Chang,Chao Zhang,Xin Yang,Shaoming Qiao,Xianghua Chen
Carbon fluoride (CF x ), recognized as a high-voltage material, exhibits elevated voltage and tunable electrochemical behavior. This study systematically investigates the impact of F content on the physical properties and electrochemical performance. Thermogravimetric analysis revealed that CF x with 60 % F content maintains an impressive mass retention of 98.2 % at temperatures up to 450°C. At current density of 20 mA/cm 2 , the CF x containing 58 % F atom achieves the highest specific capacity of 578 mAh/g. Furthermore, CF x with 55 % F content attains a peak voltage exceeding 3.0 V. Hence, F contens influence the application of CF x . This work provides valuable insights for the design of CF x cathodes in thermal batteries.
研究领域:
材料科学
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电化学
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储能
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
Toxicologie Analytique et Clinique
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2025
·
IF 1.7
Jiajun Sun,Xiaolong Zhang,Mengchao Wang,Xiaoyu Zhou,Yuxuan Chen,Jinlei liu,Yinyin Dai,Kundi Zhao,Yaqin Sun,Jie Gu,Huimin Zhang,Shengnan Zhang,Amin Wurita,Koutaro Hasegawa
Purpose Fluoxetine is a clinically used antidepressant, due to its slimming effect, unscrupulous elements will add it to slimming products. The aim of this study was to establish an optimized derivatization method for fluoxetine and norfluoxetine to be analized by a gas chromatography-tandem mass spectrometry (GC-MS/MS) and apply it to real case. Methods Hair samples were washed and cut into approximately 2 mm, and 50 mg was added to the internal standard and hydrolyzed with 1% sodium hydroxide solution. Add 3 mL ethyl acetate, vortex and centrifuge; urine samples were taken as 1 mL and then added to the internal standard and 3 mL ethyl acetate, then submitted to vortex and centrifugation. The supernatant was evaporated to dryness under a nitrogen gas stream and then derivatized by adding 25 μL ethyl acetate and 25 μL HFBA at 70 °C for 45 minutes and later analyzed by GC-MS/MS. The derivatisation procedure for the remaining derivatisation reagents TFAA, FPPA, MSTFA and 99% BSTFA + 1% TMCS was the same as above. Result Fluoxetine and norfluoxetine were analyzed by GC-MS/MS and the validation data were satisfactory. The derivatization reagent HFBA was the most effective for the modification of fluoxetine and norfluoxetine. The concentrations of fluoxetine in hair and urine extracts were 40.9 ng/mg and 10.8 ng/mL, respectively; the concentrations of norfluoxetine were 4.94 ng/mg and 7.57 ng/mL, respectively. Conclusion A method for the determination of fluoxetine and norfluoxetine in human hair and urine by GC-MS/MS was developed and applied to real cases. Furthermore, the chemical modification effects of five derivatization reagents on fluoxetine and norfluoxetine were compared, and the best effect was obtained by HFBA at 70 °C for 45 min.
研究领域:
分析化学
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毒理学
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临床医学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xu-Qin Ran,Can Zhu,Qian-Ying Mao,Shu-Ting Xu,Shuangping Liu,Peng Gu,Yun Jiang,Xiu-Ping Yan,Hai-Long Qian
Advancements of covalent organic frameworks (COFs) in the field of adsorption and extraction are always limited by their non-uniform and irregular aggregated morphology. Herein, we pioneer the preparation of monodisperse COFs with regular shape and further explore their adsorption and extraction capability. As proof of concept, a new monodisperse fluorinated 3D COF named as M-TAM-TFTA, featuring a nonpolar structure and uniform size and shape, is selected as the model COF for adsorption and extraction of perfluorocarboxylic acids (PFCAs). M-TAM-TFTA, consisting of tetra(4-anilyl)methane and 2,3,5,6-tetrafluoroterephthalaldehyde, exhibits larger adsorption capacity (554.9 mg g-1) and faster adsorption kinetics (5 min) compared to the same composition aggregated 3D COF A-TAM-TFTA as well as diverse reported materials. This remarkable adsorption performance of M-TAM-TFTA for PFCAs is proved to be dominantly caused by its lower mass transfer resistance structure and multiple specific interactions including F-F, hydrophobic, electrostatic and H-bonding interactions. The M-TAM-TFTA is further applied to develop a probe nanoelectrospray ionization mass spectrometry (PESI-MS) method for direct and precise determination of PFCAs with a wide linear range (0.5 - 5000 ng L-1) and low limits of detection (0.08 - 0.46 ng L-1). This study provides robust support for the great potential of monodisperse COF as adsorbent for treatment of contaminant in complex samples.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）