Full
Chen Pingan (1986-), male, Ph.D, Associate/Professor. E-mail: pinganchen@wust.edu.cn
Outline
The core-shell composites (FeCo@TiO2, FeCo@TiO2@Fe3O4) were fabricated via hydrolysis reactions with flattened FeCo as the core and TiO2 and Fe3O4 as the shell. The morphology and phase composition of the core-shell composites (i.e., FeCo@TiO2, FeCo@TiO2@Fe3O4) were characterized by scanning electron microscopy and X-ray diffraction. The results show that the core-shell composite is flattened with diameters of 20-50 μm and thicknesses of 3-5 μm. The main components of the coating layer are TiO2 and Fe3O4, which are uniformly distributed on the flattened FeCo core. The complex permittivity and permeability of the samples were measured in a frequency range of 2~18 GHz, and the reflection loss of the samples was calculated based on the transmission line theory. It is indicated that the effective absorption bandwidth of the FeCo@TiO2@Fe3O4 samples at room temperature is 3 GHz (RL<-10 dB) with the thickness of 2.5mm, and the minimum reflection loss of the sample is -35.4 dB. The effective absorption bandwidth is 2GHz, and the minimum RL value is -29.2 dB after annealing at 500℃. The thermogravimetric analysis indicates that the weight gain of FeCo@TiO2@Fe3O4 is 20% less than that of FeCo at 800℃.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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