COLLOID AND POLYMER SCIENCE
·
2019
·Vol. 297
·期 2
·213-224
·
IF 1.906
Zhu Weihui,Ma Jing,Nan Xi,Osei Lartey Patrick,Yang Yongzhen
Poor dispersion of graphene in solvents and polymers remains a critical obstacle in practical application of poly(vinylidene fluoride) (PVDF) composite which loading graphene as filler. In order to inhibit the aggregation of reduced graphene oxide (RGO), two dispersants, polyimide (PI) and polyaniline (PANI), were used to modify RGO via in situ polymerization. The functionalization of reduced graphene oxide was characterized by Fourier transform infrared (FT-IR) and X-ray diffraction (XRD). Hansen solubility parameters (HSPs) theory was an effective way to investigate the compatibility of reduced graphene oxide in various solvents and polymers. Light optical microscope was employed to evaluate actual dispersion of functionalized RGO within the PVDF matrix. From the practical consideration, the dielectric and dynamic mechanical properties of PVDF and the composites were tested by dielectric impedance spectrometer and dynamic mechanical analysis (DMA), which illustrated the dispersion of reduced graphene oxide in poly(vinylidene fluoride) was closely related to physical performance of composites.
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研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 5
·1088-1098
·
IF 3.552
Shang Hui,Guo Chong,Ye Pengfei,Zhang Wenhui
Catalytic hydrodesulfurization (HDS) technique is widely used for clean gasoline production. However, traditional HDS catalyst (CoMo/γ-Al 2 O 3 ) exhibits high hydrogenation performance of olefins (HYDO), resulting in the loss of gasoline octane number. To achieve high HDS/HYDO ratio, the key issue is to reduce the interaction between active metals and the support, therefore, in this research, the modified CoMo/γ-Al 2 O 3 catalysts with various boron amounts were investigated under traditional or microwave heating. The effects of preparing methods as well as boron amounts on the active phase, acidic properties and HDS catalytic activities were examined. Results show that the modification, especially under microwave treatment, can significantly weaken the interaction between the active component and the support by enlarging the surface area and pore diameter, and reducing the acidity of the support. As a result, the stacking numbers of MoS 2 slabs were obviously improved by the modification and microwave treatment, contributing to higher edge/ rim ratio, and resulting in higher HDS performance and selectivity to olefin.
研究领域:
催化化学
·
能源化工
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高影响因子
MACROMOLECULAR RESEARCH
·
2022
·Vol. 30
·期 10
·719-730
·
IF 2.127
Zhang Xing,He Juan,Wang Huige,Xu Pengfei,Wang Mingyu,Li Yuanyuan,Chen Jing,He Lijun
In this study, surface molecularly imprinted polymers were synthesized with the metal-organic framework NH 2 -MIL-53 as carrier and naringenin as alternative template of Ochratoxin A (OTA). The amino groups on the surface of NH 2 -MIL-53 reacted with the epoxy groups in glycidyl methacrylate (GMA). Subsequently, the double bonds of the GMA grafting on the surface of the material were used for polymerization to prepare the surface molecularly imprinted polymers. The obtained polymers were characterized by scanning electron microscope, transmission electron microscope, energy spectrometer, Fourier infrared spectrometer, X-ray diffraction, and laser particle size analyzer. Synthetic polymer was combined with solid phase extraction for separation and enrichment of trace OTA in grains. The spiked recoveries were found to be 78.95–106.45%, with relative standard deviations ranging from 5.16% to 6.31%. The detection limit and the quantification limit of the method were 0.04 µg·kg −1 and 0.12 µg·kg −1 , respectively. Comparing the pretreatment effects of the self-made cartridge and the immunoaffinity column on the OTA in the sample, it showed that the self-made column had excellent performance and provided a new pretreatment method for the treatment of OTA in grains.
研究领域:
食品科学
·
分析化学
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 33
·期 1
·10
·
IF 2.8
Sun Ying-Xiang,Lu Kun-Rong,Ji Ying,Guo An-Bang,Zhang Jin,Zhang Yu-Hang
Solid polymer electrolytes (SPEs) are flexible and exhibit wide application prospects. However, their low ionic conductivity at room temperature largely restricts their practical use in next-generation solid-state lithium batteries. A composite polymer electrolyte (CPE) that combines the advantages of soft chains and rigid particles is constructed to balance the electrochemical properties and mechanical strength. Hydrophobic nano-fumed silica (SiO 2 ) fillers are uniformly distributed in the dense cross-linking -CH 2 -CH 2 O- network, which is composed of polyethylene oxide and tetraglyme that is triggered by ultraviolet irradiation. The increasing amorphous region of the resulting CPE, due to the cross-linking and nanoparticles doping, facilitates an excellent electrochemical property with an ionic conductivity of 0.29 mS·cm − 1 and a lithium transference number of 0.60 at room temperature. Moreover, the compact film with a tensile elongation of 57% can provide close interfacial contact and ensure more security for cells at work. The assembled Li||LiFePO 4 cells can deliver a reversible specific capacity of 160 mAh g − 1 at 0.1 C at room temperature and a capacity retention of 98% after 100 cycles. This study proposes a novel method for creating high-performance composite solid electrolytes at room temperature.
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高影响因子
POLYMER BULLETIN
·
2025
·Vol. 83
·期 4
·179
·
IF 4
Shen Xiaoxuan,Chen Longhai,Ma Yichang,Li Ziyi,Liang Bo,Zhang Yue-Fei
Using BASF commercial polyurethane 1185 A (TPU) as the modifying material, polyurethane-modified asphalt in varying dosages was created for this study. The rheological properties, fatigue behavior, temperature sensitivity, chemical composition, and self-healing properties of polyurethane-modified asphalt were all characterized using multi-dimensional characterization techniques, such as the dynamic shear rheometer test (DSR), bending creep stiffness test (BBR), fatigue-healing-fatigue test, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The findings of the study indicated that adding TPU to asphalt can optimize its low-temperature performance, effectively increase its low-temperature flexibility, and greatly increase its resistance to low-temperature cracking. Excellent interfacial adhesion between the modifier and the base asphalt was found by microscopic morphological investigation. According to the results of the fatigue-healing-fatigue tests, the modified asphalt’s self-healing performance progressively improved as the TPU content rose, peaking at 6% TPU content. When the TPU concentration is 6%, the changed asphalt achieves the best overall modification effect, according to a thorough investigation of all performance metrics. This study’s findings offer a theoretical foundation for enhancing matrix asphalt’s rheological characteristics and self-healing capabilities while also prolonging the pavement’s service life.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 237
·期 3
·129
·
IF 3
Han Yuliang,Fang Jiahui,Ji Xinyuan,Hu Sheng
To address the problem of excessive Cd (II) content in selenium-rich soil and water in Enshi region, this experiment utilized ion imprinting for selective adsorption of cadmium, which made the separation of selenium and cadmium possible. A novel attapulgite-based Cd(II) ion-imprinted polymer (AF-IIP) was prepared with the surface imprinting technique, using magnetic attapulgite as the matrix and (3-mercaptopropyl) trimethoxysilane (MPS) as the functional monomer. SEM, XRD, VSM, FT-IR and EDS elemental analysis were performed to confirm the structural transformations and compositional changes of the materials during the preparation process. The optimal pH, optimal time, adsorption kinetics and adsorption isotherms during the adsorption of Cd (II) by ion-imprinted polymers were investigated. The experimental results showed that the optimum pH of the adsorption process was 6.0 and the maximum adsorption amount was 49.0 mg·g −1 . In the presence of competitive ions, the adsorption capacity of AF-IIP for Cd (II) is much larger than that of Se ions, indicating that AF-IIP has good selectivity. The adsorption reaction conformed to the Langmuir isotherm model and kinetic data were more suitable to be explained by pseudo-second-order model. Furthermore, XPS analysis confirmed that Cd(II) adsorption primarily occurs via interactions with thiol (-SH) groups. In addition, regeneration tests have shown that AF-IIP was reusable and stable.
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International Journal of Minerals Metallurgy and Materials
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2025
·Vol. 33
·期 1
·177-190
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IF 7.2
Dong Yinrui,Yang Yongbin,Wang Lin,Duan Qianqian,Li Qian,Zhang Yan,Jiang Tao
Bentonite is a necessary binder in producing pellets. Its excessive use reduces the iron grade of pellets and increases production costs. Minimizing bentonite dosage is essential for producing high-quality iron ore pellets. Addressing the gap in the application of organically-intercalated modified bentonite in the pelletizing field, this study introduces an innovative modification process for bentonite that employs the synergistic effect of mechanical force and dimethyl sulfoxide to enhance the intercalation of organic compounds within bentonite, thus significantly enhancing its binding performance. The colloid value and swell capacity of modified bentonite (98.5 mL/3g and 55.0 mL/g) were much higher than the original bentonite (90.5 mL/3g and 17.5 mL/g). With the decrease of bentonite dosage from 1.5wt% to 1.0wt%, the drop number of green pellets from a height of 0.5 m and the compressive strengths of roasted pellets using the modified bentonite (6.0 times and 2916 N per pellet) were significantly higher than those of the original bentonite (4.0 times and 2739 N per pellet). This study provides a comprehensive analysis of the intercalation modification mechanism of bentonite, offering crucial technical insights for the development of high-performance modified bentonite as iron ore pellet binders.
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高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 193
·期 1
·49
·
IF 5.3
Wang Chuang,Peng Yue,Miao Yuanyuan,Sun Xinyuan,Cheng Wenting,Li Jinlong
DNA methyltransferases (MTases) play a critical role in epigenetic regulation and are closely associated with the occurrence and development of various diseases. To address the limitations of current detection methods, which often suffer from complicated operation and limited sensitivity we have developed a label-free fluorescent biosensing platform based on DNA-templated silver nanoclusters (DNA-AgNCs) for the detection of DNA adenine methyltransferase (Dam MTase) activity and the screening of its inhibitors. In this system, DNA-AgNCs signal probes are synthesized via a simple reduction reaction. Dumbbell-shaped DNA substrates are designed to be specifically methylated by Dam MTase in the presence of S-adenosylmethionine (SAM). The methylated substrates are subsequently recognized and cleaved by DpnI, yielding DNA fragments with 3′-OH termini. These termini are extended by terminal deoxynucleotidyl transferase (TdT) in the presence of dGTP, generating G-rich sequences, which hybridize with the DNA-AgNCs and significantly enhance the fluorescence intensity. This cascade reaction enables the sensitive detection of Dam MTase activity. Compared with the other approaches, the proposed method exhibits a wider linear range (0.5–10 U/mL) and a lower detection limit (0.165 U/mL). Furthermore, inhibition studies demonstrate that 5-fluorouracil and gentamicin effectively suppress Dam MTase activity. The method also shows excellent performance in complex biological samples. Overall, this fluorescence-based strategy offers high sensitivity and excellent specificity, demonstrating broad application prospects in epigenetic research and drug discovery. Graphical
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PubMed
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2025
·Vol. 116
·期 1
·10
·
IF 2.2
Huang Junyun,Liu Boying,Yuan Sijia,Zhou Haiyun,Bao Jian,Tu Yong,Wang Zunyao,Wang Weixia
The UV filter benzophenone-3 (BP-3) is a prevalent environmental pollutant due to its extensive use in personal care products, raising concerns about its ecological risks. This study investigated the pH-dependent oxidative stress effects of benzophenone-3 (BP-3) on Carassius auratus by measuring four key biomarkers—superoxide dismutase, catalase, glutathione, and malonaldehyde in liver tissue. The results demonstrated that BP-3 exposure led to significant oxidative stress, as evidenced by altered antioxidant levels and increased lipid peroxidation. The integrated biomarker response indicated that stress was more pronounced at higher BP-3 concentrations and varied with pH, being greatest under acidic conditions. These findings demonstrate that the toxicity of BP-3 is strongly influenced by environmental pH, highlighting the necessity of incorporating pH variations into ecological risk assessments of ionizable organic pollutants.
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PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Yan Qin-Yu,Song Shun-Gang,Zhou Bu-Jie,Hu Jing,Feng Lian-Fang,Gu Xue-Ping,Zhang Cai-Liang
Poly(phenylene oxide) (PPO) exhibits excellent dielectric properties, making it an ideal substrate for high-frequency, high-speed copper-clad laminates. The phenolic hydroxyl group at the end of PPO plays a key role in its reactivity. Accurately quantifying the phenolic hydroxyl content in PPO is essential but challenging. In this study, we proposed a method for measuring the phenolic hydroxyl content of PPO using differential UV absorption spectroscopy. In alkaline solutions, the phenolic hydroxyl in PPO completely ionizes to form phenoxide ions, leading to a significant increase in UV absorbance at approximately 250 and 300 nm. Notably, the differential UV absorbance at approximately 300 nm was directly proportional to the phenolic hydroxyl concentration. Using 2,6-dimethylphenol as a standard, a calibration curve was established to relate the phenolic hydroxyl concentration to differential UV absorbance at approximately 300 nm, providing a precise and straightforward method for phenolic hydroxyl quantification in PPO with distinct advantages over conventional techniques.
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高影响因子
CHROMATOGRAPHIA
·
2025
·
IF 1.3
Huang Zhongping,Zou Jianfeng,Zhang Junhao,Wang Haodong,Liu Huijun
In this study, quaternized cationic polyelectrolytes were successfully decorated on polystyrene-divinylbenzene (PS-DVB) microspheres in deep eutectic solvents (DESs). Quaternized cationic polyelectrolytes and hyperbranched layers were prepared using 1,4-butanediol diglycidyl ether (BDDE) and methylamine (MA) as monomers. The effects of different reaction solvents, the amount of agglomerated polyelectrolytes, and the number of hyperbranched layers on the chromatographic performance of the stationary phase were investigated. The surface morphological feature and chemical composition of the PS-DVB microspheres were characterized by SEM, FT-IR, and elemental analysis. The results showed that the optimized anion exchanger had a good chromatographic performance by choosing a mixture of 2.0 mmol/L sodium carbonate and 2.0 mmol/L sodium bicarbonate as the mobile phase at a flow rate of 1.0 mL/min. Seven common anions (fluoride ion, chloride ion, nitrite ion, bromide ion, nitrate ion, phosphate ion, and sulfate ion) were well separated within 25 min. The average numbers of theoretical plates per meter for three batches of columns prepared in DESs increased by 5% ~ 20%, as compared with those of the columns prepared in deionized water. Additionally, the asymmetry factors of detected anions were also improved for the columns prepared in DESs.
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高影响因子
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
·
2025
·
IF 3.3
Li Junjie,Liu Kunyi,Kang Kaijie,Zhao Lina,Zhang Banglei,Li Lang,Huang Hai,Jiang Liwen
Fermented salt-free bamboo shoots, a traditional fermented vegetable product, are esteemed in southern China for their unique flavor and aroma. The distinctive taste of these shoots is attributed to the volatile organic compounds (VOCs) and organic acids produced during fermentation. This study explored how organic acids and VOCs change over a 60-day fermentation period. The findings revealed notable variations in pH, total sugars, and organic acids throughout the process. Utilizing GC-IMS (gas chromatography-mass spectrometry) analysis, 65 volatile organic compounds (VOCs) were detected, which comprised alcohols, aldehydes, esters, ketones, and aromatic compounds. The concentration and composition of VOCs changed significantly during the fermentation process. Esters and aldehydes were the predominant VOCs. The changes in organic acids levels were correlated with the production of specific VOCs, indicating complex interactions between organic acids and VOCs during the fermentation process. Employing correlation analysis and OPLS-DA (orthogonal partial least squares discriminant analysis), we identified 14 pivotal volatile organic compounds (VOCs) and organic acids that exert the most significant influence on the flavor profile of fermented salt-free bamboo shoots. This study provides invaluable insights for enhancing both the processing and economic potential of bamboo shoots.
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高影响因子
危险品化学品经营许可证（带存储）