CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 4
·536-540
·
IF 1.248
Xue Longqi,Feng Yusha,Song Yan,Wang Rui,Liu Dahai,Du Jianshi,Yang Qingbiao,Li Yaoxian
A novel water-soluble hybrid fluorescein-coumarin dye(FLNC) fluorescence ratiometric probe to recognize OCl − was designed and synthesized. The most prominent feature of the probe is that the molecular structure contains two different fluorophores, and the fluorescein moiety was connected to coumarin moiety by diacylhydrazine linker. When OCl − was added, the two fluorophores in the FLNC probe could have a rapid respond simultaneously, with high selectivity and sensitivity towards OCl – among other reactive oxygen species/reactive nitrogen species(ROS/RNS) and anions, and the detection limit was measured to be 0.30 μmol/L. In addition, the color changes of the solution could be observed by the naked eye and have a short response time(completed within 1 min), which suggestes that the probe FLNC has the potential to be used for real-time detection.
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高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2009
·Vol. 13
·期 2
·155-158
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IF 0.886
Zhang Jiaoxia,Zheng Yaping,Yu Peiying,He Lin,Wang Huining,Wang Rumin
A trimeric quaternary ammonium salt surfactant containing polyoxyethylene chains was synthesized from fatty alcohol polyoxyethylene ether, pentamethyldiethylenetriamine and thionyl chloride by a two-step process. Its chemical structure was characterized, and the surface activity in aqueous solution was studied at different temperatures. The results showed that when the concentration attains the CMC (1.0 mmol/L), the surface tension is 38.9 mN m −1 and the conductivity is 105.3μS cm −1 at 25 °C. These show that the trimeric quaternary ammonium salt surfactant containing polyoxyethylene chains exhibits high surface activity and effectively reduces the surface tension of water.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 27
·13097-13108
·
IF 4.682
Feng Peiyuan,Wang Xiwen,Yang Jin
Cellulose-based aerogels have become a great potential for oil absorption applications due to their wide range of sources, low density, and good adsorption properties. However, many reported cellulose-based aerogels to have the drawbacks of low oil recovery rate and poor mechanical, which limit their application. In this study, high reusable and excellent mechanical properties silylated TEMPO-oxidized nanofibers/polyvinyl alcohol aerogels (STPA) were fabricated through a three-step process of aqueous silylation, bidirectional freezing, and freeze-drying. A bidirectional freezing technique was employed to obtain two unique structural aerogels by adjusting the methyltrimethoxysilane concentration. The STPA possessed many excellent physical properties, such as ultralight (9.79 mg/cm3), hydrophobicity (136°), and compressibility; as an adsorbent, STPA showed high adsorption capacity (51–111 g/g) for various types of organic solvents. Furthermore, the excellent compressibility enables STPA fast and highly efficient recovery of the absorbed oil by simple mechanical squeeze. It possesses an excellent oil recovery rate of 80% and maintains around 90% of its initial saturated absorption capacity after 50 cycles of absorption–squeezing. Therefore, the successful microstructure design of the biomass-aerogel through bidirectional freezing could provide new thoughts for the design of multifunctional oil absorbents and STPA with good mechanical properties and reusability showing promising prospects in the field of water treatment. Graphical abstract
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高影响因子
MEDICINAL CHEMISTRY RESEARCH
·
2022
·Vol. 31
·期 6
·936-948
·
IF 2.351
Hu Shijia,Li Yunqi,Kan Weiqiong,Ding Tingting,Gu Haijun,Zhang Ting,Yi Zhengfang,Chen Yihua
A series of diphenyl- N -heteroaromatic compounds were designed, synthesized, and evaluated for anticancer efficacies (antimigration and antiproliferation) against human cancer cell lines. The favorable 2 H -1,2,3-triazole compound 4a was optimized, leading to the discovery of compounds 4b and 4c with more potent antimigratory and antiproliferative activities. The transwell assay showed that compounds 4b and 4c dose-independently inhibited the migration of the two cancer cell lines (human breast cancer cell line MDA-MB-231 and pancreatic cancer cell line PANC1) with the low IC 50 values of 0.24 and 0.47 µM, respectively. The sulforhodamine-B (SRB) assay showed that compounds 4b and 4c inhibited the proliferation of PANC1 cells with the IC 50 values 0.86 µM and 1.41 µM, respectively. These results indicate that compounds 4b and 4c with 1,2,3-triazole scaffold may be further developed as potent anticancer agents in the future.
A series of novel diphenyl- N -heteroaromatics based on our previous published research work were synthesized and evaluated for their antimigration efficacies against MDA-MB-231 and PANC1 human cancer cell lines. Compound 4c dose-independently inhibited the migration of the two cancer cell lines (MDA-MB-231 and PANC1) with low IC 50 values 0.32 µM and 0.24 µM respectively.
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高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 10
·1530-1541
·
IF 11.534
Zhang Chang,Hu Xiangchen,Nie Zhiwei,Wu Cong,Zheng Nan,Chen Shaojie,Yang Yihang,Wei Ran,Yu Jiameng,Yang Nan,Yu Yi,Liu Wei
Garnet-type oxide is one of the most promising solid-state electrolytes (SSEs) for solid-state lithium-metal batteries (SSLMBs). However, the Li dendrite formation in garnet oxides obstructs the further development of the SSLMBs seriously. Here, we report a high-performance garnet oxide by using AlN as a sintering additive and Li as an anode interface layer. AlN with high thermal conductivity can promote the sintering activity of the garnet oxides, resulting in larger particle size and higher relative density. Moreover, Li 3 N with high ionic conductivity formed at grain boundaries and interface can also improve Li-ion transport kinetics. As a result, the garnet oxide electrolytes with AlN show enhanced thermal conductivity, improved ionic conductivity, reduced electronic conductivity, and increased critical current density (CCD), compared with the counterpart using Al 2 O 3 sintering aid. In addition, Li symmetric cells and Li∣LiFePO 4 (Li∣LFP) half cells using the garnet electrolyte with the AlN additive exhibit good electrochemical performances. This work provides a simple and effective strategy for high-performance SSEs.
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高影响因子
Science China-Chemistry
·
2017
·Vol. 60
·期 4
·490-496
·
IF 4.132
Li Qinfen,Wu Jiake,Wu Ruihan,Liu Yujing,Chen Hongzheng,Huang Fei,Li Hanying
Contact resistance at the interface between metal electrodes and semiconductors can significantly limit the performance of organic field-effect transistors, leading to a distinct voltage drop at the interface. Here, we demonstrate enhanced performance of n-channel field-effect transistors based on solution-grown C 60 single-crystalline ribbons by introducing an interlayer of a conjugated polyelectrolyte (CPE) composed of poly[(9,9-bis(3′-(( N , N -dimethyl)- N -ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] dibromide (PFN + Br − ). The PFN + Br − interlayer greatly improves the charge injection. Consequently, the electron mobility is promoted up to 5.60 cm 2 V −1 s −1 and the threshold voltage decreased dramatically with the minimum of 4.90 V.
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高影响因子
JOM
·
2019
·Vol. 71
·期 10
·3673-3681
·
IF 2.305
Gao Guilan,He Xin,Lou Xiaoyi,Jiao Zheng,Guo Yaoguang,Chen Shuai,Luo Xingmin,Sun Suyang,Guan Jie,Yuan Hao
Recycling of valuable metals from spent lithium-ion batteries (LIBs) appears inevitable for both environmental protection and resource recovery. In the present study, an efficient hydrometallurgical leaching of Co and Li from cathode materials of spent LIBs using a citric acid/sodium thiosulfate (Na 2 S 2 O 3 ) system is explored. The effects of citric acid and Na 2 S 2 O 3 concentrations, leaching time, temperature, and the solid/liquid ( S / L ) ratio on the leaching processes are also examined. With the exception of the S / L ratio, the increase of citric acid concentration, Na 2 S 2 O 3 concentration, leaching time, and temperature all have positive effects on the leaching of Co and Li. Ultimately, approximately 96% of Co and 99% of Li are recycled from the spent LIBs in this citric acid/sodium thiosulfate system under the leaching conditions of an S / L ratio of 20 g l −1 , concentration of Na 2 S 2 O 3 of 0.3 M, concentration of citric acid of 1.2 M, leaching time of 30 min, and leaching temperature of 70°C. The Avrami equation is well fitted by the data of the leaching processes, and model equations are built to describe the leaching of Co and Li. Furthermore, pure sulfur can be obtained as a by-product during the leaching process, and SO 2 produced during the reaction is easily collected as a raw material for industrial production of sulfuric acid. The present study represents a promising process for hydrometallurgical recovery of valuable metals from spent LIBs.
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高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 9
·2410-2420
·
IF 2.799
Zanon Adriano,Chaemchuen Somboon,Verpoort Francis
Abstract Three different bimetallic zinc-cobalt zeolitic imidazolate frameworks (ZIFs) were successfully synthesized at room temperature in water through a green and simple procedure and tested as catalysts for the Knoevenagel condensation reaction between p -Br-benzaldehyde and malononitrile as model reaction. The materials were characterized with various techniques (XRD, ICP-AES, SEM, N 2 adsorption–desorption, TGA) and displayed excellent activities and selectivities. Moreover, the crystalline structure was preserved and the catalysts could be reused at least four times with negligible loss of activity. Graphical Abstract
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高影响因子
Journal of Food Measurement and Characterization
·
2019
·Vol. 14
·期 1
·535-547
·
IF 1.415
Al-Dalali Sam,Zheng Fuping,Sun Baoguo,Chen Feng,Wang Peng,Wang Wenping
Zhengrong vinegar is one of the renowned popular condiments in China, which has been consumed around Hebei province for about 136 years. Its different processing steps are considered as important and critical steps that are responsible for the generation of representative flavors besides the acetic acid. An HS-SPME coupled with GC–MS method was used to evaluate the changes of the volatiles of the vinegar that were generated during the different processing steps including before adding salt (BAS), after adding salt (AAS), after filtration (AF) and final product (FP). In addition, aroma-active volatiles of the final vinegar product were characterized by GC-O coupled with detection frequency technique (modified frequency, MF%) that is a combination of aroma intensity and aroma frequency values that can be used to improve the description of a reliable data from GC-O. Among the 42 detected volatiles, 38 of them were positively identified by their corresponding authentic compounds. Besides, 24 volatiles were recognized as aroma-active volatiles. On the other hand, the content of individual volatile groups was decreased along with the continuation of the fermentation process from the BAS step to FP step, except the aldehydes group that displayed a slight increase. Of which, 2-pentylfuran and ethyl heptanoate disappeared in the AF and FP samples. The main contributors to the Zhengrong aroma profile that had MF (%) > 80 included isovaleric acid, 2-acetoxy-3-butanone, hexanoic acid, ethyl hexanoate, 3-(methylthio)propyl acetate, decanal and 2-phenyl-2-butenal, while the volatile compounds that had a middle MF in a range between 70 and 80 were 2-methylbutanoic acid, tetramethylpyrazine, nonanal, 1,2-dimethoxybenzene, 4-ethylphenol, ethyl benzoate, ethyl benzeneacetate, 2-phenylethyl acetate and 4-ethylguaiacol.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 15
·10772-10783
·
IF 2.993
Liu Guangyang,Li Lingyun,Huang Xiaodong,Zheng Shuning,Xu Xiaomin,Liu Zhongxiao,Zhang Yanguo,Wang Jing,Lin Huan,Xu Donghui
In this study, the functional adsorbent metal–organic framework ZIF-8/magnetic multi-walled carbon nanotubes (M-M-ZIF-8) was successfully prepared for removal of eight organophosphorus pesticides from environmental water and soil samples. The M-M-ZIF-8 was characterized and their adsorption capacity was evaluated based on their isothermal adsorption curves. The results suggest that ZIF-8 particles are deposited on the surface of the magnetic MWCNTs via coordination–polymerization strategy. In addition, M-M-ZIF-8 has high static adsorption capacities for organophosphorus pesticides because of its high specific surface area and porous structure. The static adsorption data fit the Freundlich adsorption model better than the Langmuir model. Under the optimized conditions, M-M-ZIF-8 was successfully applied to remove the eight organophosphorus pesticides from environmental water and soil samples. A possible mechanism is valence-electron-driven adsorption by sharing or exchanging of electrons between the organophosphorus pesticide molecules and the vacant active sites of M-M-ZIF-8. Therefore, M-M-ZIF-8 is a promising hybrid adsorbent for adsorption and removal of organic pollutions from the environment.
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高影响因子
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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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.
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高影响因子
危险品化学品经营许可证（带存储）