LIU Xuefeng (1992-), male, Master candidate. E-mail: use131421@163.com
ZrO2 nanosheets were prepared at low temperature by a molten salt method with assistance of solvothermal process using zirconium chloride as zirconium source and ethanol as a solvent. The effects of salt type and content on the growth and morphology of zirconia crystals were investigated. The results show that monoclinic zirconia nanosheets with an average side length of 1.8 μm, a thickness of 70 nm and a width: thickness ratio of more than 10∶1 can be obtained when NaCl and Na3PO4 are used as composite molten salts and the mass ratio of precursor∶NaCl∶Na3PO4 is set to 10∶10∶1. The nanosheet shows single crystal structure with little defects, and the main exposed surface is (001) facet. The formation process in molten salts accords with a self-focusing mechanism, including dissolution, diffusion, adsorption and growth. The large percentage of (001) facet obtained is in reasonable agreement with that based on the theoretical calculation of surface energy.
| 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 |