采用原位聚合法制得聚苯胺包覆r-GO/Fe_3O_4锂离子电池负极材料,通过X射线衍射、恒流充放电测试及电化学测试技术研究聚苯胺的包覆量对复合材料的组成及性能影响。结果表明,聚苯胺以无定型态分布于r-GO/Fe_3O_4中,其引入并未改变r-GO/Fe...采用原位聚合法制得聚苯胺包覆r-GO/Fe_3O_4锂离子电池负极材料,通过X射线衍射、恒流充放电测试及电化学测试技术研究聚苯胺的包覆量对复合材料的组成及性能影响。结果表明,聚苯胺以无定型态分布于r-GO/Fe_3O_4中,其引入并未改变r-GO/Fe_3O_4的结构,经聚苯胺包覆后复合材料的电化学性能提升,其中聚苯胺的包覆量为0.15 mol时,复合材料的阻抗最小,首次充放电比容量分别为569.332和645.720 m Ah/g,库仑效率达86.8%,经过20次循环后,库仑效率保持在98%以上,嵌锂容量保持率稳定在81.1%,循环性能良好。展开更多
Plasmopam viticola, a causal agent of grapevine downy mildew, is a widely distributed pathogen, which can cause destructive disease in field-grown grapevines. Although fungicides are used to treat the disease, fungici...Plasmopam viticola, a causal agent of grapevine downy mildew, is a widely distributed pathogen, which can cause destructive disease in field-grown grapevines. Although fungicides are used to treat the disease, fungicide-resistant strains have been emerging. In this study, we developed graphene oxide （GO）-Fe3O4 nanocomposites, which could effectively repress the germination of sporangia and inhibit the development of downy mildew. 50 μg mL^-1 GO-Fe3O4 showed excellent protective and fungiddal activities. 250 μg mL^-1 GO-Fe3O4 on grapevine leaves in the field could significantly decrease the severity of downy mildew, suggesting its potent curative effect. Moreover, GO-Fe3O4 had no significant toxic effects on grapevine plants even at the concentration twice that of the highest dosage （1000 μg mL^-1） used in this study. Our work suggested that GO-Fe3O4 would offer an important opportunity to develop new approach for controlling plant diseases.展开更多
A series of bioactive quinazolinones were effectively synthesized by the condensation of halide benzamide with amino acid using magnetically recyclable GO/Fe3O4–CuI as catalyst. Magnetic GO/Fe3O4–CuI was prepared vi...A series of bioactive quinazolinones were effectively synthesized by the condensation of halide benzamide with amino acid using magnetically recyclable GO/Fe3O4–CuI as catalyst. Magnetic GO/Fe3O4–CuI was prepared via a simple chemical method and characterized by FTIR, powder XRD, and SEM.This heterogeneous copper catalyst can be easily separated from reaction mixtures by an external permanent magnet and reused without any obvious loss in activity which shows its applicability as a reusable and promising catalyst for quinazolinones synthesis.展开更多
文摘采用原位聚合法制得聚苯胺包覆r-GO/Fe_3O_4锂离子电池负极材料,通过X射线衍射、恒流充放电测试及电化学测试技术研究聚苯胺的包覆量对复合材料的组成及性能影响。结果表明,聚苯胺以无定型态分布于r-GO/Fe_3O_4中,其引入并未改变r-GO/Fe_3O_4的结构,经聚苯胺包覆后复合材料的电化学性能提升,其中聚苯胺的包覆量为0.15 mol时,复合材料的阻抗最小,首次充放电比容量分别为569.332和645.720 m Ah/g,库仑效率达86.8%,经过20次循环后,库仑效率保持在98%以上,嵌锂容量保持率稳定在81.1%,循环性能良好。
基金supported by the National Natural Science Foundation of China (31501680 and 21277055)the Natural Science Foundation of Hebei Province (C2014407061 and C2014407008)PhD Research Startup Foundation of Hebei Normal University of Science and Technology (2013YB005)
文摘Plasmopam viticola, a causal agent of grapevine downy mildew, is a widely distributed pathogen, which can cause destructive disease in field-grown grapevines. Although fungicides are used to treat the disease, fungicide-resistant strains have been emerging. In this study, we developed graphene oxide （GO）-Fe3O4 nanocomposites, which could effectively repress the germination of sporangia and inhibit the development of downy mildew. 50 μg mL^-1 GO-Fe3O4 showed excellent protective and fungiddal activities. 250 μg mL^-1 GO-Fe3O4 on grapevine leaves in the field could significantly decrease the severity of downy mildew, suggesting its potent curative effect. Moreover, GO-Fe3O4 had no significant toxic effects on grapevine plants even at the concentration twice that of the highest dosage （1000 μg mL^-1） used in this study. Our work suggested that GO-Fe3O4 would offer an important opportunity to develop new approach for controlling plant diseases.
基金supported by the Research Foundation of Tongji University
文摘A series of bioactive quinazolinones were effectively synthesized by the condensation of halide benzamide with amino acid using magnetically recyclable GO/Fe3O4–CuI as catalyst. Magnetic GO/Fe3O4–CuI was prepared via a simple chemical method and characterized by FTIR, powder XRD, and SEM.This heterogeneous copper catalyst can be easily separated from reaction mixtures by an external permanent magnet and reused without any obvious loss in activity which shows its applicability as a reusable and promising catalyst for quinazolinones synthesis.
